nextcloud / server

apps/dav/lib/CardDAV/CardDavBackend.php

Indentation +1325 added lines, -1325 removed lines

@@ -62,1329 +62,1329 @@
 
 class CardDavBackend implements BackendInterface, SyncSupport {
 
-	use TTransactional;
-
-	public const PERSONAL_ADDRESSBOOK_URI = 'contacts';
-	public const PERSONAL_ADDRESSBOOK_NAME = 'Contacts';
-
-	private Principal $principalBackend;
-	private string $dbCardsTable = 'cards';
-	private string $dbCardsPropertiesTable = 'cards_properties';
-	private IDBConnection $db;
-	private Backend $sharingBackend;
-
-	/** @var array properties to index */
-	public static array $indexProperties = [
-		'BDAY', 'UID', 'N', 'FN', 'TITLE', 'ROLE', 'NOTE', 'NICKNAME',
-		'ORG', 'CATEGORIES', 'EMAIL', 'TEL', 'IMPP', 'ADR', 'URL', 'GEO',
-		'CLOUD', 'X-SOCIALPROFILE'];
-
-	/**
-	 * @var string[] Map of uid => display name
-	 */
-	protected array $userDisplayNames;
-	private IUserManager $userManager;
-	private IEventDispatcher $dispatcher;
-	private array $etagCache = [];
-
-	/**
-	 * CardDavBackend constructor.
-	 *
-	 * @param IDBConnection $db
-	 * @param Principal $principalBackend
-	 * @param IUserManager $userManager
-	 * @param IGroupManager $groupManager
-	 * @param IEventDispatcher $dispatcher
-	 */
-	public function __construct(IDBConnection $db,
-								Principal $principalBackend,
-								IUserManager $userManager,
-								IGroupManager $groupManager,
-								IEventDispatcher $dispatcher) {
-		$this->db = $db;
-		$this->principalBackend = $principalBackend;
-		$this->userManager = $userManager;
-		$this->dispatcher = $dispatcher;
-		$this->sharingBackend = new Backend($this->db, $this->userManager, $groupManager, $principalBackend, 'addressbook');
-	}
-
-	/**
-	 * Return the number of address books for a principal
-	 *
-	 * @param $principalUri
-	 * @return int
-	 */
-	public function getAddressBooksForUserCount($principalUri) {
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$query = $this->db->getQueryBuilder();
-		$query->select($query->func()->count('*'))
-			->from('addressbooks')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-
-		$result = $query->executeQuery();
-		$column = (int) $result->fetchOne();
-		$result->closeCursor();
-		return $column;
-	}
-
-	/**
-	 * Returns the list of address books for a specific user.
-	 *
-	 * Every addressbook should have the following properties:
-	 *   id - an arbitrary unique id
-	 *   uri - the 'basename' part of the url
-	 *   principaluri - Same as the passed parameter
-	 *
-	 * Any additional clark-notation property may be passed besides this. Some
-	 * common ones are :
-	 *   {DAV:}displayname
-	 *   {urn:ietf:params:xml:ns:carddav}addressbook-description
-	 *   {http://calendarserver.org/ns/}getctag
-	 *
-	 * @param string $principalUri
-	 * @return array
-	 */
-	public function getAddressBooksForUser($principalUri) {
-		$principalUriOriginal = $principalUri;
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
-			->from('addressbooks')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-
-		$addressBooks = [];
-
-		$result = $query->execute();
-		while ($row = $result->fetch()) {
-			$addressBooks[$row['id']] = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'principaluri' => $this->convertPrincipal($row['principaluri'], false),
-				'{DAV:}displayname' => $row['displayname'],
-				'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
-			];
-
-			$this->addOwnerPrincipal($addressBooks[$row['id']]);
-		}
-		$result->closeCursor();
-
-		// query for shared addressbooks
-		$principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
-		$principals = array_merge($principals, $this->principalBackend->getCircleMembership($principalUriOriginal));
-
-		$principals[] = $principalUri;
-
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['a.id', 'a.uri', 'a.displayname', 'a.principaluri', 'a.description', 'a.synctoken', 's.access'])
-			->from('dav_shares', 's')
-			->join('s', 'addressbooks', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
-			->where($query->expr()->in('s.principaluri', $query->createParameter('principaluri')))
-			->andWhere($query->expr()->eq('s.type', $query->createParameter('type')))
-			->setParameter('type', 'addressbook')
-			->setParameter('principaluri', $principals, IQueryBuilder::PARAM_STR_ARRAY)
-			->execute();
-
-		$readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
-		while ($row = $result->fetch()) {
-			if ($row['principaluri'] === $principalUri) {
-				continue;
-			}
-
-			$readOnly = (int)$row['access'] === Backend::ACCESS_READ;
-			if (isset($addressBooks[$row['id']])) {
-				if ($readOnly) {
-					// New share can not have more permissions then the old one.
-					continue;
-				}
-				if (isset($addressBooks[$row['id']][$readOnlyPropertyName]) &&
-					$addressBooks[$row['id']][$readOnlyPropertyName] === 0) {
-					// Old share is already read-write, no more permissions can be gained
-					continue;
-				}
-			}
-
-			[, $name] = \Sabre\Uri\split($row['principaluri']);
-			$uri = $row['uri'] . '_shared_by_' . $name;
-			$displayName = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
-
-			$addressBooks[$row['id']] = [
-				'id' => $row['id'],
-				'uri' => $uri,
-				'principaluri' => $principalUriOriginal,
-				'{DAV:}displayname' => $displayName,
-				'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $row['principaluri'],
-				$readOnlyPropertyName => $readOnly,
-			];
-
-			$this->addOwnerPrincipal($addressBooks[$row['id']]);
-		}
-		$result->closeCursor();
-
-		return array_values($addressBooks);
-	}
-
-	public function getUsersOwnAddressBooks($principalUri) {
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
-			->from('addressbooks')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-
-		$addressBooks = [];
-
-		$result = $query->execute();
-		while ($row = $result->fetch()) {
-			$addressBooks[$row['id']] = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'principaluri' => $this->convertPrincipal($row['principaluri'], false),
-				'{DAV:}displayname' => $row['displayname'],
-				'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
-			];
-
-			$this->addOwnerPrincipal($addressBooks[$row['id']]);
-		}
-		$result->closeCursor();
-
-		return array_values($addressBooks);
-	}
-
-	private function getUserDisplayName($uid) {
-		if (!isset($this->userDisplayNames[$uid])) {
-			$user = $this->userManager->get($uid);
-
-			if ($user instanceof IUser) {
-				$this->userDisplayNames[$uid] = $user->getDisplayName();
-			} else {
-				$this->userDisplayNames[$uid] = $uid;
-			}
-		}
-
-		return $this->userDisplayNames[$uid];
-	}
-
-	/**
-	 * @param int $addressBookId
-	 */
-	public function getAddressBookById(int $addressBookId): ?array {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
-			->from('addressbooks')
-			->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId, IQueryBuilder::PARAM_INT)))
-			->executeQuery();
-		$row = $result->fetch();
-		$result->closeCursor();
-		if (!$row) {
-			return null;
-		}
-
-		$addressBook = [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'principaluri' => $row['principaluri'],
-			'{DAV:}displayname' => $row['displayname'],
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-			'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
-		];
-
-		$this->addOwnerPrincipal($addressBook);
-
-		return $addressBook;
-	}
-
-	public function getAddressBooksByUri(string $principal, string $addressBookUri): ?array {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
-			->from('addressbooks')
-			->where($query->expr()->eq('uri', $query->createNamedParameter($addressBookUri)))
-			->andWhere($query->expr()->eq('principaluri', $query->createNamedParameter($principal)))
-			->setMaxResults(1)
-			->executeQuery();
-
-		$row = $result->fetch();
-		$result->closeCursor();
-		if ($row === false) {
-			return null;
-		}
-
-		$addressBook = [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'principaluri' => $row['principaluri'],
-			'{DAV:}displayname' => $row['displayname'],
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-			'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
-		];
-
-		$this->addOwnerPrincipal($addressBook);
-
-		return $addressBook;
-	}
-
-	/**
-	 * Updates properties for an address book.
-	 *
-	 * The list of mutations is stored in a Sabre\DAV\PropPatch object.
-	 * To do the actual updates, you must tell this object which properties
-	 * you're going to process with the handle() method.
-	 *
-	 * Calling the handle method is like telling the PropPatch object "I
-	 * promise I can handle updating this property".
-	 *
-	 * Read the PropPatch documentation for more info and examples.
-	 *
-	 * @param string $addressBookId
-	 * @param \Sabre\DAV\PropPatch $propPatch
-	 * @return void
-	 */
-	public function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
-		$supportedProperties = [
-			'{DAV:}displayname',
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description',
-		];
-
-		$propPatch->handle($supportedProperties, function ($mutations) use ($addressBookId) {
-			$updates = [];
-			foreach ($mutations as $property => $newValue) {
-				switch ($property) {
-					case '{DAV:}displayname':
-						$updates['displayname'] = $newValue;
-						break;
-					case '{' . Plugin::NS_CARDDAV . '}addressbook-description':
-						$updates['description'] = $newValue;
-						break;
-				}
-			}
-			$query = $this->db->getQueryBuilder();
-			$query->update('addressbooks');
-
-			foreach ($updates as $key => $value) {
-				$query->set($key, $query->createNamedParameter($value));
-			}
-			$query->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId)))
-				->executeStatement();
-
-			$this->addChange($addressBookId, "", 2);
-
-			$addressBookRow = $this->getAddressBookById((int)$addressBookId);
-			$shares = $this->getShares((int)$addressBookId);
-			$this->dispatcher->dispatchTyped(new AddressBookUpdatedEvent((int)$addressBookId, $addressBookRow, $shares, $mutations));
-
-			return true;
-		});
-	}
-
-	/**
-	 * Creates a new address book
-	 *
-	 * @param string $principalUri
-	 * @param string $url Just the 'basename' of the url.
-	 * @param array $properties
-	 * @return int
-	 * @throws BadRequest
-	 */
-	public function createAddressBook($principalUri, $url, array $properties) {
-		if (strlen($url) > 255) {
-			throw new BadRequest('URI too long. Address book not created');
-		}
-
-		$values = [
-			'displayname' => null,
-			'description' => null,
-			'principaluri' => $principalUri,
-			'uri' => $url,
-			'synctoken' => 1
-		];
-
-		foreach ($properties as $property => $newValue) {
-			switch ($property) {
-				case '{DAV:}displayname':
-					$values['displayname'] = $newValue;
-					break;
-				case '{' . Plugin::NS_CARDDAV . '}addressbook-description':
-					$values['description'] = $newValue;
-					break;
-				default:
-					throw new BadRequest('Unknown property: ' . $property);
-			}
-		}
-
-		// Fallback to make sure the displayname is set. Some clients may refuse
-		// to work with addressbooks not having a displayname.
-		if (is_null($values['displayname'])) {
-			$values['displayname'] = $url;
-		}
-
-		[$addressBookId, $addressBookRow] = $this->atomic(function() use ($values) {
-			$query = $this->db->getQueryBuilder();
-			$query->insert('addressbooks')
-				->values([
-					'uri' => $query->createParameter('uri'),
-					'displayname' => $query->createParameter('displayname'),
-					'description' => $query->createParameter('description'),
-					'principaluri' => $query->createParameter('principaluri'),
-					'synctoken' => $query->createParameter('synctoken'),
-				])
-				->setParameters($values)
-				->execute();
-
-			$addressBookId = $query->getLastInsertId();
-			return [
-				$addressBookId,
-				$this->getAddressBookById($addressBookId),
-			];
-		}, $this->db);
-
-		$this->dispatcher->dispatchTyped(new AddressBookCreatedEvent($addressBookId, $addressBookRow));
-
-		return $addressBookId;
-	}
-
-	/**
-	 * Deletes an entire addressbook and all its contents
-	 *
-	 * @param mixed $addressBookId
-	 * @return void
-	 */
-	public function deleteAddressBook($addressBookId) {
-		$addressBookId = (int)$addressBookId;
-		$addressBookData = $this->getAddressBookById($addressBookId);
-		$shares = $this->getShares($addressBookId);
-
-		$query = $this->db->getQueryBuilder();
-		$query->delete($this->dbCardsTable)
-			->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
-			->setParameter('addressbookid', $addressBookId, IQueryBuilder::PARAM_INT)
-			->executeStatement();
-
-		$query->delete('addressbookchanges')
-			->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
-			->setParameter('addressbookid', $addressBookId, IQueryBuilder::PARAM_INT)
-			->executeStatement();
-
-		$query->delete('addressbooks')
-			->where($query->expr()->eq('id', $query->createParameter('id')))
-			->setParameter('id', $addressBookId, IQueryBuilder::PARAM_INT)
-			->executeStatement();
-
-		$this->sharingBackend->deleteAllShares($addressBookId);
-
-		$query->delete($this->dbCardsPropertiesTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId, IQueryBuilder::PARAM_INT)))
-			->executeStatement();
-
-		if ($addressBookData) {
-			$this->dispatcher->dispatchTyped(new AddressBookDeletedEvent($addressBookId, $addressBookData, $shares));
-		}
-	}
-
-	/**
-	 * Returns all cards for a specific addressbook id.
-	 *
-	 * This method should return the following properties for each card:
-	 *   * carddata - raw vcard data
-	 *   * uri - Some unique url
-	 *   * lastmodified - A unix timestamp
-	 *
-	 * It's recommended to also return the following properties:
-	 *   * etag - A unique etag. This must change every time the card changes.
-	 *   * size - The size of the card in bytes.
-	 *
-	 * If these last two properties are provided, less time will be spent
-	 * calculating them. If they are specified, you can also omit carddata.
-	 * This may speed up certain requests, especially with large cards.
-	 *
-	 * @param mixed $addressbookId
-	 * @return array
-	 */
-	public function getCards($addressbookId) {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
-			->from($this->dbCardsTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressbookId)));
-
-		$cards = [];
-
-		$result = $query->execute();
-		while ($row = $result->fetch()) {
-			$row['etag'] = '"' . $row['etag'] . '"';
-
-			$modified = false;
-			$row['carddata'] = $this->readBlob($row['carddata'], $modified);
-			if ($modified) {
-				$row['size'] = strlen($row['carddata']);
-			}
-
-			$cards[] = $row;
-		}
-		$result->closeCursor();
-
-		return $cards;
-	}
-
-	/**
-	 * Returns a specific card.
-	 *
-	 * The same set of properties must be returned as with getCards. The only
-	 * exception is that 'carddata' is absolutely required.
-	 *
-	 * If the card does not exist, you must return false.
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $cardUri
-	 * @return array
-	 */
-	public function getCard($addressBookId, $cardUri) {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
-			->from($this->dbCardsTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
-			->setMaxResults(1);
-
-		$result = $query->execute();
-		$row = $result->fetch();
-		if (!$row) {
-			return false;
-		}
-		$row['etag'] = '"' . $row['etag'] . '"';
-
-		$modified = false;
-		$row['carddata'] = $this->readBlob($row['carddata'], $modified);
-		if ($modified) {
-			$row['size'] = strlen($row['carddata']);
-		}
-
-		return $row;
-	}
-
-	/**
-	 * Returns a list of cards.
-	 *
-	 * This method should work identical to getCard, but instead return all the
-	 * cards in the list as an array.
-	 *
-	 * If the backend supports this, it may allow for some speed-ups.
-	 *
-	 * @param mixed $addressBookId
-	 * @param array $uris
-	 * @return array
-	 */
-	public function getMultipleCards($addressBookId, array $uris) {
-		if (empty($uris)) {
-			return [];
-		}
-
-		$chunks = array_chunk($uris, 100);
-		$cards = [];
-
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
-			->from($this->dbCardsTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->andWhere($query->expr()->in('uri', $query->createParameter('uri')));
-
-		foreach ($chunks as $uris) {
-			$query->setParameter('uri', $uris, IQueryBuilder::PARAM_STR_ARRAY);
-			$result = $query->execute();
-
-			while ($row = $result->fetch()) {
-				$row['etag'] = '"' . $row['etag'] . '"';
-
-				$modified = false;
-				$row['carddata'] = $this->readBlob($row['carddata'], $modified);
-				if ($modified) {
-					$row['size'] = strlen($row['carddata']);
-				}
-
-				$cards[] = $row;
-			}
-			$result->closeCursor();
-		}
-		return $cards;
-	}
-
-	/**
-	 * Creates a new card.
-	 *
-	 * The addressbook id will be passed as the first argument. This is the
-	 * same id as it is returned from the getAddressBooksForUser method.
-	 *
-	 * The cardUri is a base uri, and doesn't include the full path. The
-	 * cardData argument is the vcard body, and is passed as a string.
-	 *
-	 * It is possible to return an ETag from this method. This ETag is for the
-	 * newly created resource, and must be enclosed with double quotes (that
-	 * is, the string itself must contain the double quotes).
-	 *
-	 * You should only return the ETag if you store the carddata as-is. If a
-	 * subsequent GET request on the same card does not have the same body,
-	 * byte-by-byte and you did return an ETag here, clients tend to get
-	 * confused.
-	 *
-	 * If you don't return an ETag, you can just return null.
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $cardUri
-	 * @param string $cardData
-	 * @param bool $checkAlreadyExists
-	 * @return string
-	 */
-	public function createCard($addressBookId, $cardUri, $cardData, bool $checkAlreadyExists = true) {
-		$etag = md5($cardData);
-		$uid = $this->getUID($cardData);
-
-		if ($checkAlreadyExists) {
-			$q = $this->db->getQueryBuilder();
-			$q->select('uid')
-				->from($this->dbCardsTable)
-				->where($q->expr()->eq('addressbookid', $q->createNamedParameter($addressBookId)))
-				->andWhere($q->expr()->eq('uid', $q->createNamedParameter($uid)))
-				->setMaxResults(1);
-			$result = $q->executeQuery();
-			$count = (bool)$result->fetchOne();
-			$result->closeCursor();
-			if ($count) {
-				throw new \Sabre\DAV\Exception\BadRequest('VCard object with uid already exists in this addressbook collection.');
-			}
-		}
-
-		$query = $this->db->getQueryBuilder();
-		$query->insert('cards')
-			->values([
-				'carddata' => $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB),
-				'uri' => $query->createNamedParameter($cardUri),
-				'lastmodified' => $query->createNamedParameter(time()),
-				'addressbookid' => $query->createNamedParameter($addressBookId),
-				'size' => $query->createNamedParameter(strlen($cardData)),
-				'etag' => $query->createNamedParameter($etag),
-				'uid' => $query->createNamedParameter($uid),
-			])
-			->execute();
-
-		$etagCacheKey = "$addressBookId#$cardUri";
-		$this->etagCache[$etagCacheKey] = $etag;
-
-		$this->addChange($addressBookId, $cardUri, 1);
-		$this->updateProperties($addressBookId, $cardUri, $cardData);
-
-		$addressBookData = $this->getAddressBookById($addressBookId);
-		$shares = $this->getShares($addressBookId);
-		$objectRow = $this->getCard($addressBookId, $cardUri);
-		$this->dispatcher->dispatchTyped(new CardCreatedEvent($addressBookId, $addressBookData, $shares, $objectRow));
-
-		return '"' . $etag . '"';
-	}
-
-	/**
-	 * Updates a card.
-	 *
-	 * The addressbook id will be passed as the first argument. This is the
-	 * same id as it is returned from the getAddressBooksForUser method.
-	 *
-	 * The cardUri is a base uri, and doesn't include the full path. The
-	 * cardData argument is the vcard body, and is passed as a string.
-	 *
-	 * It is possible to return an ETag from this method. This ETag should
-	 * match that of the updated resource, and must be enclosed with double
-	 * quotes (that is: the string itself must contain the actual quotes).
-	 *
-	 * You should only return the ETag if you store the carddata as-is. If a
-	 * subsequent GET request on the same card does not have the same body,
-	 * byte-by-byte and you did return an ETag here, clients tend to get
-	 * confused.
-	 *
-	 * If you don't return an ETag, you can just return null.
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $cardUri
-	 * @param string $cardData
-	 * @return string
-	 */
-	public function updateCard($addressBookId, $cardUri, $cardData) {
-		$uid = $this->getUID($cardData);
-		$etag = md5($cardData);
-		$query = $this->db->getQueryBuilder();
-
-		// check for recently stored etag and stop if it is the same
-		$etagCacheKey = "$addressBookId#$cardUri";
-		if (isset($this->etagCache[$etagCacheKey]) && $this->etagCache[$etagCacheKey] === $etag) {
-			return '"' . $etag . '"';
-		}
-
-		$query->update($this->dbCardsTable)
-			->set('carddata', $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB))
-			->set('lastmodified', $query->createNamedParameter(time()))
-			->set('size', $query->createNamedParameter(strlen($cardData)))
-			->set('etag', $query->createNamedParameter($etag))
-			->set('uid', $query->createNamedParameter($uid))
-			->where($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->execute();
-
-		$this->etagCache[$etagCacheKey] = $etag;
-
-		$this->addChange($addressBookId, $cardUri, 2);
-		$this->updateProperties($addressBookId, $cardUri, $cardData);
-
-		$addressBookData = $this->getAddressBookById($addressBookId);
-		$shares = $this->getShares($addressBookId);
-		$objectRow = $this->getCard($addressBookId, $cardUri);
-		$this->dispatcher->dispatchTyped(new CardUpdatedEvent($addressBookId, $addressBookData, $shares, $objectRow));
-		return '"' . $etag . '"';
-	}
-
-	/**
-	 * Deletes a card
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $cardUri
-	 * @return bool
-	 */
-	public function deleteCard($addressBookId, $cardUri) {
-		$addressBookData = $this->getAddressBookById($addressBookId);
-		$shares = $this->getShares($addressBookId);
-		$objectRow = $this->getCard($addressBookId, $cardUri);
-
-		try {
-			$cardId = $this->getCardId($addressBookId, $cardUri);
-		} catch (\InvalidArgumentException $e) {
-			$cardId = null;
-		}
-		$query = $this->db->getQueryBuilder();
-		$ret = $query->delete($this->dbCardsTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
-			->executeStatement();
-
-		$this->addChange($addressBookId, $cardUri, 3);
-
-		if ($ret === 1) {
-			if ($cardId !== null) {
-				$this->dispatcher->dispatchTyped(new CardDeletedEvent($addressBookId, $addressBookData, $shares, $objectRow));
-				$this->purgeProperties($addressBookId, $cardId);
-			}
-			return true;
-		}
-
-		return false;
-	}
-
-	/**
-	 * The getChanges method returns all the changes that have happened, since
-	 * the specified syncToken in the specified address book.
-	 *
-	 * This function should return an array, such as the following:
-	 *
-	 * [
-	 *   'syncToken' => 'The current synctoken',
-	 *   'added'   => [
-	 *      'new.txt',
-	 *   ],
-	 *   'modified'   => [
-	 *      'modified.txt',
-	 *   ],
-	 *   'deleted' => [
-	 *      'foo.php.bak',
-	 *      'old.txt'
-	 *   ]
-	 * ];
-	 *
-	 * The returned syncToken property should reflect the *current* syncToken
-	 * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
-	 * property. This is needed here too, to ensure the operation is atomic.
-	 *
-	 * If the $syncToken argument is specified as null, this is an initial
-	 * sync, and all members should be reported.
-	 *
-	 * The modified property is an array of nodenames that have changed since
-	 * the last token.
-	 *
-	 * The deleted property is an array with nodenames, that have been deleted
-	 * from collection.
-	 *
-	 * The $syncLevel argument is basically the 'depth' of the report. If it's
-	 * 1, you only have to report changes that happened only directly in
-	 * immediate descendants. If it's 2, it should also include changes from
-	 * the nodes below the child collections. (grandchildren)
-	 *
-	 * The $limit argument allows a client to specify how many results should
-	 * be returned at most. If the limit is not specified, it should be treated
-	 * as infinite.
-	 *
-	 * If the limit (infinite or not) is higher than you're willing to return,
-	 * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
-	 *
-	 * If the syncToken is expired (due to data cleanup) or unknown, you must
-	 * return null.
-	 *
-	 * The limit is 'suggestive'. You are free to ignore it.
-	 *
-	 * @param string $addressBookId
-	 * @param string $syncToken
-	 * @param int $syncLevel
-	 * @param int|null $limit
-	 * @return array
-	 */
-	public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
-		// Current synctoken
-		$qb = $this->db->getQueryBuilder();
-		$qb->select('synctoken')
-			->from('addressbooks')
-			->where(
-				$qb->expr()->eq('id', $qb->createNamedParameter($addressBookId))
-			);
-		$stmt = $qb->executeQuery();
-		$currentToken = $stmt->fetchOne();
-		$stmt->closeCursor();
-
-		if (is_null($currentToken)) {
-			return [];
-		}
-
-		$result = [
-			'syncToken' => $currentToken,
-			'added' => [],
-			'modified' => [],
-			'deleted' => [],
-		];
-
-		if ($syncToken) {
-			$qb = $this->db->getQueryBuilder();
-			$qb->select('uri', 'operation')
-				->from('addressbookchanges')
-				->where(
-					$qb->expr()->andX(
-						$qb->expr()->gte('synctoken', $qb->createNamedParameter($syncToken)),
-						$qb->expr()->lt('synctoken', $qb->createNamedParameter($currentToken)),
-						$qb->expr()->eq('addressbookid', $qb->createNamedParameter($addressBookId))
-					)
-				)->orderBy('synctoken');
-
-			if (is_int($limit) && $limit > 0) {
-				$qb->setMaxResults($limit);
-			}
-
-			// Fetching all changes
-			$stmt = $qb->executeQuery();
-
-			$changes = [];
-
-			// This loop ensures that any duplicates are overwritten, only the
-			// last change on a node is relevant.
-			while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-				$changes[$row['uri']] = $row['operation'];
-			}
-			$stmt->closeCursor();
-
-			foreach ($changes as $uri => $operation) {
-				switch ($operation) {
-					case 1:
-						$result['added'][] = $uri;
-						break;
-					case 2:
-						$result['modified'][] = $uri;
-						break;
-					case 3:
-						$result['deleted'][] = $uri;
-						break;
-				}
-			}
-		} else {
-			$qb = $this->db->getQueryBuilder();
-			$qb->select('uri')
-				->from('cards')
-				->where(
-					$qb->expr()->eq('addressbookid', $qb->createNamedParameter($addressBookId))
-				);
-			// No synctoken supplied, this is the initial sync.
-			$stmt = $qb->executeQuery();
-			$result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
-			$stmt->closeCursor();
-		}
-		return $result;
-	}
-
-	/**
-	 * Adds a change record to the addressbookchanges table.
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $objectUri
-	 * @param int $operation 1 = add, 2 = modify, 3 = delete
-	 * @return void
-	 */
-	protected function addChange($addressBookId, $objectUri, $operation) {
-		$sql = 'INSERT INTO `*PREFIX*addressbookchanges`(`uri`, `synctoken`, `addressbookid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `*PREFIX*addressbooks` WHERE `id` = ?';
-		$stmt = $this->db->prepare($sql);
-		$stmt->execute([
-			$objectUri,
-			$addressBookId,
-			$operation,
-			$addressBookId
-		]);
-		$stmt = $this->db->prepare('UPDATE `*PREFIX*addressbooks` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?');
-		$stmt->execute([
-			$addressBookId
-		]);
-	}
-
-	/**
-	 * @param resource|string $cardData
-	 * @param bool $modified
-	 * @return string
-	 */
-	private function readBlob($cardData, &$modified = false) {
-		if (is_resource($cardData)) {
-			$cardData = stream_get_contents($cardData);
-		}
-
-		// Micro optimisation
-		// don't loop through
-		if (strpos($cardData, 'PHOTO:data:') === 0) {
-			return $cardData;
-		}
-
-		$cardDataArray = explode("\r\n", $cardData);
-
-		$cardDataFiltered = [];
-		$removingPhoto = false;
-		foreach ($cardDataArray as $line) {
-			if (strpos($line, 'PHOTO:data:') === 0
-				&& strpos($line, 'PHOTO:data:image/') !== 0) {
-				// Filter out PHOTO data of non-images
-				$removingPhoto = true;
-				$modified = true;
-				continue;
-			}
-
-			if ($removingPhoto) {
-				if (strpos($line, ' ') === 0) {
-					continue;
-				}
-				// No leading space means this is a new property
-				$removingPhoto = false;
-			}
-
-			$cardDataFiltered[] = $line;
-		}
-		return implode("\r\n", $cardDataFiltered);
-	}
-
-	/**
-	 * @param list<array{href: string, commonName: string, readOnly: bool}> $add
-	 * @param list<string> $remove
-	 */
-	public function updateShares(IShareable $shareable, array $add, array $remove): void {
-		$addressBookId = $shareable->getResourceId();
-		$addressBookData = $this->getAddressBookById($addressBookId);
-		$oldShares = $this->getShares($addressBookId);
-
-		$this->sharingBackend->updateShares($shareable, $add, $remove);
-
-		$this->dispatcher->dispatchTyped(new AddressBookShareUpdatedEvent($addressBookId, $addressBookData, $oldShares, $add, $remove));
-	}
-
-	/**
-	 * Search contacts in a specific address-book
-	 *
-	 * @param int $addressBookId
-	 * @param string $pattern which should match within the $searchProperties
-	 * @param array $searchProperties defines the properties within the query pattern should match
-	 * @param array $options = array() to define the search behavior
-	 *    - 'escape_like_param' - If set to false wildcards _ and % are not escaped, otherwise they are
-	 *    - 'limit' - Set a numeric limit for the search results
-	 *    - 'offset' - Set the offset for the limited search results
-	 *    - 'wildcard' - Whether the search should use wildcards
-	 * @psalm-param array{escape_like_param?: bool, limit?: int, offset?: int, wildcard?: bool} $options
-	 * @return array an array of contacts which are arrays of key-value-pairs
-	 */
-	public function search($addressBookId, $pattern, $searchProperties, $options = []): array {
-		return $this->searchByAddressBookIds([$addressBookId], $pattern, $searchProperties, $options);
-	}
-
-	/**
-	 * Search contacts in all address-books accessible by a user
-	 *
-	 * @param string $principalUri
-	 * @param string $pattern
-	 * @param array $searchProperties
-	 * @param array $options
-	 * @return array
-	 */
-	public function searchPrincipalUri(string $principalUri,
-									   string $pattern,
-									   array $searchProperties,
-									   array $options = []): array {
-		$addressBookIds = array_map(static function ($row):int {
-			return (int) $row['id'];
-		}, $this->getAddressBooksForUser($principalUri));
-
-		return $this->searchByAddressBookIds($addressBookIds, $pattern, $searchProperties, $options);
-	}
-
-	/**
-	 * @param array $addressBookIds
-	 * @param string $pattern
-	 * @param array $searchProperties
-	 * @param array $options
-	 * @psalm-param array{types?: bool, escape_like_param?: bool, limit?: int, offset?: int, wildcard?: bool} $options
-	 * @return array
-	 */
-	private function searchByAddressBookIds(array $addressBookIds,
-											string $pattern,
-											array $searchProperties,
-											array $options = []): array {
-		$escapePattern = !\array_key_exists('escape_like_param', $options) || $options['escape_like_param'] !== false;
-		$useWildcards = !\array_key_exists('wildcard', $options) || $options['wildcard'] !== false;
-
-		$query2 = $this->db->getQueryBuilder();
-
-		$addressBookOr = $query2->expr()->orX();
-		foreach ($addressBookIds as $addressBookId) {
-			$addressBookOr->add($query2->expr()->eq('cp.addressbookid', $query2->createNamedParameter($addressBookId)));
-		}
-
-		if ($addressBookOr->count() === 0) {
-			return [];
-		}
-
-		$propertyOr = $query2->expr()->orX();
-		foreach ($searchProperties as $property) {
-			if ($escapePattern) {
-				if ($property === 'EMAIL' && strpos($pattern, ' ') !== false) {
-					// There can be no spaces in emails
-					continue;
-				}
-
-				if ($property === 'CLOUD' && preg_match('/[^a-zA-Z0-9 :_.@\/\-\']/', $pattern) === 1) {
-					// There can be no chars in cloud ids which are not valid for user ids plus :/
-					// worst case: CA61590A-BBBC-423E-84AF-E6DF01455A53@https://my.nxt/srv/
-					continue;
-				}
-			}
-
-			$propertyOr->add($query2->expr()->eq('cp.name', $query2->createNamedParameter($property)));
-		}
-
-		if ($propertyOr->count() === 0) {
-			return [];
-		}
-
-		$query2->selectDistinct('cp.cardid')
-			->from($this->dbCardsPropertiesTable, 'cp')
-			->andWhere($addressBookOr)
-			->andWhere($propertyOr);
-
-		// No need for like when the pattern is empty
-		if ('' !== $pattern) {
-			if (!$useWildcards) {
-				$query2->andWhere($query2->expr()->eq('cp.value', $query2->createNamedParameter($pattern)));
-			} elseif (!$escapePattern) {
-				$query2->andWhere($query2->expr()->ilike('cp.value', $query2->createNamedParameter($pattern)));
-			} else {
-				$query2->andWhere($query2->expr()->ilike('cp.value', $query2->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
-			}
-		}
-
-		if (isset($options['limit'])) {
-			$query2->setMaxResults($options['limit']);
-		}
-		if (isset($options['offset'])) {
-			$query2->setFirstResult($options['offset']);
-		}
-
-		$result = $query2->execute();
-		$matches = $result->fetchAll();
-		$result->closeCursor();
-		$matches = array_map(function ($match) {
-			return (int)$match['cardid'];
-		}, $matches);
-
-		$cards = [];
-		$query = $this->db->getQueryBuilder();
-		$query->select('c.addressbookid', 'c.carddata', 'c.uri')
-			->from($this->dbCardsTable, 'c')
-			->where($query->expr()->in('c.id', $query->createParameter('matches')));
-
-		foreach (array_chunk($matches, 1000) as $matchesChunk) {
-			$query->setParameter('matches', $matchesChunk, IQueryBuilder::PARAM_INT_ARRAY);
-			$result = $query->executeQuery();
-			$cards = array_merge($cards, $result->fetchAll());
-			$result->closeCursor();
-		}
-
-		return array_map(function ($array) {
-			$array['addressbookid'] = (int) $array['addressbookid'];
-			$modified = false;
-			$array['carddata'] = $this->readBlob($array['carddata'], $modified);
-			if ($modified) {
-				$array['size'] = strlen($array['carddata']);
-			}
-			return $array;
-		}, $cards);
-	}
-
-	/**
-	 * @param int $bookId
-	 * @param string $name
-	 * @return array
-	 */
-	public function collectCardProperties($bookId, $name) {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->selectDistinct('value')
-			->from($this->dbCardsPropertiesTable)
-			->where($query->expr()->eq('name', $query->createNamedParameter($name)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($bookId)))
-			->execute();
-
-		$all = $result->fetchAll(PDO::FETCH_COLUMN);
-		$result->closeCursor();
-
-		return $all;
-	}
-
-	/**
-	 * get URI from a given contact
-	 *
-	 * @param int $id
-	 * @return string
-	 */
-	public function getCardUri($id) {
-		$query = $this->db->getQueryBuilder();
-		$query->select('uri')->from($this->dbCardsTable)
-			->where($query->expr()->eq('id', $query->createParameter('id')))
-			->setParameter('id', $id);
-
-		$result = $query->execute();
-		$uri = $result->fetch();
-		$result->closeCursor();
-
-		if (!isset($uri['uri'])) {
-			throw new \InvalidArgumentException('Card does not exists: ' . $id);
-		}
-
-		return $uri['uri'];
-	}
-
-	/**
-	 * return contact with the given URI
-	 *
-	 * @param int $addressBookId
-	 * @param string $uri
-	 * @returns array
-	 */
-	public function getContact($addressBookId, $uri) {
-		$result = [];
-		$query = $this->db->getQueryBuilder();
-		$query->select('*')->from($this->dbCardsTable)
-			->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
-		$queryResult = $query->execute();
-		$contact = $queryResult->fetch();
-		$queryResult->closeCursor();
-
-		if (is_array($contact)) {
-			$modified = false;
-			$contact['etag'] = '"' . $contact['etag'] . '"';
-			$contact['carddata'] = $this->readBlob($contact['carddata'], $modified);
-			if ($modified) {
-				$contact['size'] = strlen($contact['carddata']);
-			}
-
-			$result = $contact;
-		}
-
-		return $result;
-	}
-
-	/**
-	 * Returns the list of people whom this address book is shared with.
-	 *
-	 * Every element in this array should have the following properties:
-	 *   * href - Often a mailto: address
-	 *   * commonName - Optional, for example a first + last name
-	 *   * status - See the Sabre\CalDAV\SharingPlugin::STATUS_ constants.
-	 *   * readOnly - boolean
-	 *
-	 * @return list<array{href: string, commonName: string, status: int, readOnly: bool, '{http://owncloud.org/ns}principal': string, '{http://owncloud.org/ns}group-share': bool}>
-	 */
-	public function getShares(int $addressBookId): array {
-		return $this->sharingBackend->getShares($addressBookId);
-	}
-
-	/**
-	 * update properties table
-	 *
-	 * @param int $addressBookId
-	 * @param string $cardUri
-	 * @param string $vCardSerialized
-	 */
-	protected function updateProperties($addressBookId, $cardUri, $vCardSerialized) {
-		$cardId = $this->getCardId($addressBookId, $cardUri);
-		$vCard = $this->readCard($vCardSerialized);
-
-		$this->purgeProperties($addressBookId, $cardId);
-
-		$query = $this->db->getQueryBuilder();
-		$query->insert($this->dbCardsPropertiesTable)
-			->values(
-				[
-					'addressbookid' => $query->createNamedParameter($addressBookId),
-					'cardid' => $query->createNamedParameter($cardId),
-					'name' => $query->createParameter('name'),
-					'value' => $query->createParameter('value'),
-					'preferred' => $query->createParameter('preferred')
-				]
-			);
-
-
-		$this->db->beginTransaction();
-
-		try {
-			foreach ($vCard->children() as $property) {
-				if (!in_array($property->name, self::$indexProperties)) {
-					continue;
-				}
-				$preferred = 0;
-				foreach ($property->parameters as $parameter) {
-					if ($parameter->name === 'TYPE' && strtoupper($parameter->getValue()) === 'PREF') {
-						$preferred = 1;
-						break;
-					}
-				}
-				$query->setParameter('name', $property->name);
-				$query->setParameter('value', mb_strcut($property->getValue(), 0, 254));
-				$query->setParameter('preferred', $preferred);
-				$query->execute();
-			}
-			$this->db->commit();
-		} catch (\Exception $e) {
-			$this->db->rollBack();
-		}
-	}
-
-	/**
-	 * read vCard data into a vCard object
-	 *
-	 * @param string $cardData
-	 * @return VCard
-	 */
-	protected function readCard($cardData) {
-		return Reader::read($cardData);
-	}
-
-	/**
-	 * delete all properties from a given card
-	 *
-	 * @param int $addressBookId
-	 * @param int $cardId
-	 */
-	protected function purgeProperties($addressBookId, $cardId) {
-		$query = $this->db->getQueryBuilder();
-		$query->delete($this->dbCardsPropertiesTable)
-			->where($query->expr()->eq('cardid', $query->createNamedParameter($cardId)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
-		$query->execute();
-	}
-
-	/**
-	 * Get ID from a given contact
-	 */
-	protected function getCardId(int $addressBookId, string $uri): int {
-		$query = $this->db->getQueryBuilder();
-		$query->select('id')->from($this->dbCardsTable)
-			->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
-
-		$result = $query->execute();
-		$cardIds = $result->fetch();
-		$result->closeCursor();
-
-		if (!isset($cardIds['id'])) {
-			throw new \InvalidArgumentException('Card does not exists: ' . $uri);
-		}
-
-		return (int)$cardIds['id'];
-	}
-
-	/**
-	 * For shared address books the sharee is set in the ACL of the address book
-	 *
-	 * @param int $addressBookId
-	 * @param list<array{privilege: string, principal: string, protected: bool}> $acl
-	 * @return list<array{privilege: string, principal: string, protected: bool}>
-	 */
-	public function applyShareAcl(int $addressBookId, array $acl): array {
-		return $this->sharingBackend->applyShareAcl($addressBookId, $acl);
-	}
-
-	/**
-	 * @throws \InvalidArgumentException
-	 */
-	public function pruneOutdatedSyncTokens(int $keep = 10_000): int {
-		if ($keep < 0) {
-			throw new \InvalidArgumentException();
-		}
-		$query = $this->db->getQueryBuilder();
-		$query->delete('addressbookchanges')
-			->orderBy('id', 'DESC')
-			->setFirstResult($keep);
-		return $query->executeStatement();
-	}
-
-	private function convertPrincipal(string $principalUri, bool $toV2): string {
-		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
-			[, $name] = \Sabre\Uri\split($principalUri);
-			if ($toV2 === true) {
-				return "principals/users/$name";
-			}
-			return "principals/$name";
-		}
-		return $principalUri;
-	}
-
-	private function addOwnerPrincipal(array &$addressbookInfo): void {
-		$ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
-		$displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
-		if (isset($addressbookInfo[$ownerPrincipalKey])) {
-			$uri = $addressbookInfo[$ownerPrincipalKey];
-		} else {
-			$uri = $addressbookInfo['principaluri'];
-		}
-
-		$principalInformation = $this->principalBackend->getPrincipalByPath($uri);
-		if (isset($principalInformation['{DAV:}displayname'])) {
-			$addressbookInfo[$displaynameKey] = $principalInformation['{DAV:}displayname'];
-		}
-	}
-
-	/**
-	 * Extract UID from vcard
-	 *
-	 * @param string $cardData the vcard raw data
-	 * @return string the uid
-	 * @throws BadRequest if no UID is available or vcard is empty
-	 */
-	private function getUID(string $cardData): string {
-		if ($cardData !== '') {
-			$vCard = Reader::read($cardData);
-			if ($vCard->UID) {
-				$uid = $vCard->UID->getValue();
-				return $uid;
-			}
-			// should already be handled, but just in case
-			throw new BadRequest('vCards on CardDAV servers MUST have a UID property');
-		}
-		// should already be handled, but just in case
-		throw new BadRequest('vCard can not be empty');
-	}
+    use TTransactional;
+
+    public const PERSONAL_ADDRESSBOOK_URI = 'contacts';
+    public const PERSONAL_ADDRESSBOOK_NAME = 'Contacts';
+
+    private Principal $principalBackend;
+    private string $dbCardsTable = 'cards';
+    private string $dbCardsPropertiesTable = 'cards_properties';
+    private IDBConnection $db;
+    private Backend $sharingBackend;
+
+    /** @var array properties to index */
+    public static array $indexProperties = [
+        'BDAY', 'UID', 'N', 'FN', 'TITLE', 'ROLE', 'NOTE', 'NICKNAME',
+        'ORG', 'CATEGORIES', 'EMAIL', 'TEL', 'IMPP', 'ADR', 'URL', 'GEO',
+        'CLOUD', 'X-SOCIALPROFILE'];
+
+    /**
+     * @var string[] Map of uid => display name
+     */
+    protected array $userDisplayNames;
+    private IUserManager $userManager;
+    private IEventDispatcher $dispatcher;
+    private array $etagCache = [];
+
+    /**
+     * CardDavBackend constructor.
+     *
+     * @param IDBConnection $db
+     * @param Principal $principalBackend
+     * @param IUserManager $userManager
+     * @param IGroupManager $groupManager
+     * @param IEventDispatcher $dispatcher
+     */
+    public function __construct(IDBConnection $db,
+                                Principal $principalBackend,
+                                IUserManager $userManager,
+                                IGroupManager $groupManager,
+                                IEventDispatcher $dispatcher) {
+        $this->db = $db;
+        $this->principalBackend = $principalBackend;
+        $this->userManager = $userManager;
+        $this->dispatcher = $dispatcher;
+        $this->sharingBackend = new Backend($this->db, $this->userManager, $groupManager, $principalBackend, 'addressbook');
+    }
+
+    /**
+     * Return the number of address books for a principal
+     *
+     * @param $principalUri
+     * @return int
+     */
+    public function getAddressBooksForUserCount($principalUri) {
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $query = $this->db->getQueryBuilder();
+        $query->select($query->func()->count('*'))
+            ->from('addressbooks')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+
+        $result = $query->executeQuery();
+        $column = (int) $result->fetchOne();
+        $result->closeCursor();
+        return $column;
+    }
+
+    /**
+     * Returns the list of address books for a specific user.
+     *
+     * Every addressbook should have the following properties:
+     *   id - an arbitrary unique id
+     *   uri - the 'basename' part of the url
+     *   principaluri - Same as the passed parameter
+     *
+     * Any additional clark-notation property may be passed besides this. Some
+     * common ones are :
+     *   {DAV:}displayname
+     *   {urn:ietf:params:xml:ns:carddav}addressbook-description
+     *   {http://calendarserver.org/ns/}getctag
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    public function getAddressBooksForUser($principalUri) {
+        $principalUriOriginal = $principalUri;
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
+            ->from('addressbooks')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+
+        $addressBooks = [];
+
+        $result = $query->execute();
+        while ($row = $result->fetch()) {
+            $addressBooks[$row['id']] = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'principaluri' => $this->convertPrincipal($row['principaluri'], false),
+                '{DAV:}displayname' => $row['displayname'],
+                '{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+                '{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
+            ];
+
+            $this->addOwnerPrincipal($addressBooks[$row['id']]);
+        }
+        $result->closeCursor();
+
+        // query for shared addressbooks
+        $principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
+        $principals = array_merge($principals, $this->principalBackend->getCircleMembership($principalUriOriginal));
+
+        $principals[] = $principalUri;
+
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select(['a.id', 'a.uri', 'a.displayname', 'a.principaluri', 'a.description', 'a.synctoken', 's.access'])
+            ->from('dav_shares', 's')
+            ->join('s', 'addressbooks', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
+            ->where($query->expr()->in('s.principaluri', $query->createParameter('principaluri')))
+            ->andWhere($query->expr()->eq('s.type', $query->createParameter('type')))
+            ->setParameter('type', 'addressbook')
+            ->setParameter('principaluri', $principals, IQueryBuilder::PARAM_STR_ARRAY)
+            ->execute();
+
+        $readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
+        while ($row = $result->fetch()) {
+            if ($row['principaluri'] === $principalUri) {
+                continue;
+            }
+
+            $readOnly = (int)$row['access'] === Backend::ACCESS_READ;
+            if (isset($addressBooks[$row['id']])) {
+                if ($readOnly) {
+                    // New share can not have more permissions then the old one.
+                    continue;
+                }
+                if (isset($addressBooks[$row['id']][$readOnlyPropertyName]) &&
+                    $addressBooks[$row['id']][$readOnlyPropertyName] === 0) {
+                    // Old share is already read-write, no more permissions can be gained
+                    continue;
+                }
+            }
+
+            [, $name] = \Sabre\Uri\split($row['principaluri']);
+            $uri = $row['uri'] . '_shared_by_' . $name;
+            $displayName = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
+
+            $addressBooks[$row['id']] = [
+                'id' => $row['id'],
+                'uri' => $uri,
+                'principaluri' => $principalUriOriginal,
+                '{DAV:}displayname' => $displayName,
+                '{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+                '{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $row['principaluri'],
+                $readOnlyPropertyName => $readOnly,
+            ];
+
+            $this->addOwnerPrincipal($addressBooks[$row['id']]);
+        }
+        $result->closeCursor();
+
+        return array_values($addressBooks);
+    }
+
+    public function getUsersOwnAddressBooks($principalUri) {
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
+            ->from('addressbooks')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+
+        $addressBooks = [];
+
+        $result = $query->execute();
+        while ($row = $result->fetch()) {
+            $addressBooks[$row['id']] = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'principaluri' => $this->convertPrincipal($row['principaluri'], false),
+                '{DAV:}displayname' => $row['displayname'],
+                '{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+                '{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
+            ];
+
+            $this->addOwnerPrincipal($addressBooks[$row['id']]);
+        }
+        $result->closeCursor();
+
+        return array_values($addressBooks);
+    }
+
+    private function getUserDisplayName($uid) {
+        if (!isset($this->userDisplayNames[$uid])) {
+            $user = $this->userManager->get($uid);
+
+            if ($user instanceof IUser) {
+                $this->userDisplayNames[$uid] = $user->getDisplayName();
+            } else {
+                $this->userDisplayNames[$uid] = $uid;
+            }
+        }
+
+        return $this->userDisplayNames[$uid];
+    }
+
+    /**
+     * @param int $addressBookId
+     */
+    public function getAddressBookById(int $addressBookId): ?array {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
+            ->from('addressbooks')
+            ->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId, IQueryBuilder::PARAM_INT)))
+            ->executeQuery();
+        $row = $result->fetch();
+        $result->closeCursor();
+        if (!$row) {
+            return null;
+        }
+
+        $addressBook = [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'principaluri' => $row['principaluri'],
+            '{DAV:}displayname' => $row['displayname'],
+            '{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+            '{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
+        ];
+
+        $this->addOwnerPrincipal($addressBook);
+
+        return $addressBook;
+    }
+
+    public function getAddressBooksByUri(string $principal, string $addressBookUri): ?array {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
+            ->from('addressbooks')
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($addressBookUri)))
+            ->andWhere($query->expr()->eq('principaluri', $query->createNamedParameter($principal)))
+            ->setMaxResults(1)
+            ->executeQuery();
+
+        $row = $result->fetch();
+        $result->closeCursor();
+        if ($row === false) {
+            return null;
+        }
+
+        $addressBook = [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'principaluri' => $row['principaluri'],
+            '{DAV:}displayname' => $row['displayname'],
+            '{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+            '{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?: '0',
+        ];
+
+        $this->addOwnerPrincipal($addressBook);
+
+        return $addressBook;
+    }
+
+    /**
+     * Updates properties for an address book.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documentation for more info and examples.
+     *
+     * @param string $addressBookId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    public function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
+        $supportedProperties = [
+            '{DAV:}displayname',
+            '{' . Plugin::NS_CARDDAV . '}addressbook-description',
+        ];
+
+        $propPatch->handle($supportedProperties, function ($mutations) use ($addressBookId) {
+            $updates = [];
+            foreach ($mutations as $property => $newValue) {
+                switch ($property) {
+                    case '{DAV:}displayname':
+                        $updates['displayname'] = $newValue;
+                        break;
+                    case '{' . Plugin::NS_CARDDAV . '}addressbook-description':
+                        $updates['description'] = $newValue;
+                        break;
+                }
+            }
+            $query = $this->db->getQueryBuilder();
+            $query->update('addressbooks');
+
+            foreach ($updates as $key => $value) {
+                $query->set($key, $query->createNamedParameter($value));
+            }
+            $query->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId)))
+                ->executeStatement();
+
+            $this->addChange($addressBookId, "", 2);
+
+            $addressBookRow = $this->getAddressBookById((int)$addressBookId);
+            $shares = $this->getShares((int)$addressBookId);
+            $this->dispatcher->dispatchTyped(new AddressBookUpdatedEvent((int)$addressBookId, $addressBookRow, $shares, $mutations));
+
+            return true;
+        });
+    }
+
+    /**
+     * Creates a new address book
+     *
+     * @param string $principalUri
+     * @param string $url Just the 'basename' of the url.
+     * @param array $properties
+     * @return int
+     * @throws BadRequest
+     */
+    public function createAddressBook($principalUri, $url, array $properties) {
+        if (strlen($url) > 255) {
+            throw new BadRequest('URI too long. Address book not created');
+        }
+
+        $values = [
+            'displayname' => null,
+            'description' => null,
+            'principaluri' => $principalUri,
+            'uri' => $url,
+            'synctoken' => 1
+        ];
+
+        foreach ($properties as $property => $newValue) {
+            switch ($property) {
+                case '{DAV:}displayname':
+                    $values['displayname'] = $newValue;
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}addressbook-description':
+                    $values['description'] = $newValue;
+                    break;
+                default:
+                    throw new BadRequest('Unknown property: ' . $property);
+            }
+        }
+
+        // Fallback to make sure the displayname is set. Some clients may refuse
+        // to work with addressbooks not having a displayname.
+        if (is_null($values['displayname'])) {
+            $values['displayname'] = $url;
+        }
+
+        [$addressBookId, $addressBookRow] = $this->atomic(function() use ($values) {
+            $query = $this->db->getQueryBuilder();
+            $query->insert('addressbooks')
+                ->values([
+                    'uri' => $query->createParameter('uri'),
+                    'displayname' => $query->createParameter('displayname'),
+                    'description' => $query->createParameter('description'),
+                    'principaluri' => $query->createParameter('principaluri'),
+                    'synctoken' => $query->createParameter('synctoken'),
+                ])
+                ->setParameters($values)
+                ->execute();
+
+            $addressBookId = $query->getLastInsertId();
+            return [
+                $addressBookId,
+                $this->getAddressBookById($addressBookId),
+            ];
+        }, $this->db);
+
+        $this->dispatcher->dispatchTyped(new AddressBookCreatedEvent($addressBookId, $addressBookRow));
+
+        return $addressBookId;
+    }
+
+    /**
+     * Deletes an entire addressbook and all its contents
+     *
+     * @param mixed $addressBookId
+     * @return void
+     */
+    public function deleteAddressBook($addressBookId) {
+        $addressBookId = (int)$addressBookId;
+        $addressBookData = $this->getAddressBookById($addressBookId);
+        $shares = $this->getShares($addressBookId);
+
+        $query = $this->db->getQueryBuilder();
+        $query->delete($this->dbCardsTable)
+            ->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
+            ->setParameter('addressbookid', $addressBookId, IQueryBuilder::PARAM_INT)
+            ->executeStatement();
+
+        $query->delete('addressbookchanges')
+            ->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
+            ->setParameter('addressbookid', $addressBookId, IQueryBuilder::PARAM_INT)
+            ->executeStatement();
+
+        $query->delete('addressbooks')
+            ->where($query->expr()->eq('id', $query->createParameter('id')))
+            ->setParameter('id', $addressBookId, IQueryBuilder::PARAM_INT)
+            ->executeStatement();
+
+        $this->sharingBackend->deleteAllShares($addressBookId);
+
+        $query->delete($this->dbCardsPropertiesTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId, IQueryBuilder::PARAM_INT)))
+            ->executeStatement();
+
+        if ($addressBookData) {
+            $this->dispatcher->dispatchTyped(new AddressBookDeletedEvent($addressBookId, $addressBookData, $shares));
+        }
+    }
+
+    /**
+     * Returns all cards for a specific addressbook id.
+     *
+     * This method should return the following properties for each card:
+     *   * carddata - raw vcard data
+     *   * uri - Some unique url
+     *   * lastmodified - A unix timestamp
+     *
+     * It's recommended to also return the following properties:
+     *   * etag - A unique etag. This must change every time the card changes.
+     *   * size - The size of the card in bytes.
+     *
+     * If these last two properties are provided, less time will be spent
+     * calculating them. If they are specified, you can also omit carddata.
+     * This may speed up certain requests, especially with large cards.
+     *
+     * @param mixed $addressbookId
+     * @return array
+     */
+    public function getCards($addressbookId) {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
+            ->from($this->dbCardsTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressbookId)));
+
+        $cards = [];
+
+        $result = $query->execute();
+        while ($row = $result->fetch()) {
+            $row['etag'] = '"' . $row['etag'] . '"';
+
+            $modified = false;
+            $row['carddata'] = $this->readBlob($row['carddata'], $modified);
+            if ($modified) {
+                $row['size'] = strlen($row['carddata']);
+            }
+
+            $cards[] = $row;
+        }
+        $result->closeCursor();
+
+        return $cards;
+    }
+
+    /**
+     * Returns a specific card.
+     *
+     * The same set of properties must be returned as with getCards. The only
+     * exception is that 'carddata' is absolutely required.
+     *
+     * If the card does not exist, you must return false.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @return array
+     */
+    public function getCard($addressBookId, $cardUri) {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
+            ->from($this->dbCardsTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
+            ->setMaxResults(1);
+
+        $result = $query->execute();
+        $row = $result->fetch();
+        if (!$row) {
+            return false;
+        }
+        $row['etag'] = '"' . $row['etag'] . '"';
+
+        $modified = false;
+        $row['carddata'] = $this->readBlob($row['carddata'], $modified);
+        if ($modified) {
+            $row['size'] = strlen($row['carddata']);
+        }
+
+        return $row;
+    }
+
+    /**
+     * Returns a list of cards.
+     *
+     * This method should work identical to getCard, but instead return all the
+     * cards in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $addressBookId
+     * @param array $uris
+     * @return array
+     */
+    public function getMultipleCards($addressBookId, array $uris) {
+        if (empty($uris)) {
+            return [];
+        }
+
+        $chunks = array_chunk($uris, 100);
+        $cards = [];
+
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata', 'uid'])
+            ->from($this->dbCardsTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->andWhere($query->expr()->in('uri', $query->createParameter('uri')));
+
+        foreach ($chunks as $uris) {
+            $query->setParameter('uri', $uris, IQueryBuilder::PARAM_STR_ARRAY);
+            $result = $query->execute();
+
+            while ($row = $result->fetch()) {
+                $row['etag'] = '"' . $row['etag'] . '"';
+
+                $modified = false;
+                $row['carddata'] = $this->readBlob($row['carddata'], $modified);
+                if ($modified) {
+                    $row['size'] = strlen($row['carddata']);
+                }
+
+                $cards[] = $row;
+            }
+            $result->closeCursor();
+        }
+        return $cards;
+    }
+
+    /**
+     * Creates a new card.
+     *
+     * The addressbook id will be passed as the first argument. This is the
+     * same id as it is returned from the getAddressBooksForUser method.
+     *
+     * The cardUri is a base uri, and doesn't include the full path. The
+     * cardData argument is the vcard body, and is passed as a string.
+     *
+     * It is possible to return an ETag from this method. This ETag is for the
+     * newly created resource, and must be enclosed with double quotes (that
+     * is, the string itself must contain the double quotes).
+     *
+     * You should only return the ETag if you store the carddata as-is. If a
+     * subsequent GET request on the same card does not have the same body,
+     * byte-by-byte and you did return an ETag here, clients tend to get
+     * confused.
+     *
+     * If you don't return an ETag, you can just return null.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @param string $cardData
+     * @param bool $checkAlreadyExists
+     * @return string
+     */
+    public function createCard($addressBookId, $cardUri, $cardData, bool $checkAlreadyExists = true) {
+        $etag = md5($cardData);
+        $uid = $this->getUID($cardData);
+
+        if ($checkAlreadyExists) {
+            $q = $this->db->getQueryBuilder();
+            $q->select('uid')
+                ->from($this->dbCardsTable)
+                ->where($q->expr()->eq('addressbookid', $q->createNamedParameter($addressBookId)))
+                ->andWhere($q->expr()->eq('uid', $q->createNamedParameter($uid)))
+                ->setMaxResults(1);
+            $result = $q->executeQuery();
+            $count = (bool)$result->fetchOne();
+            $result->closeCursor();
+            if ($count) {
+                throw new \Sabre\DAV\Exception\BadRequest('VCard object with uid already exists in this addressbook collection.');
+            }
+        }
+
+        $query = $this->db->getQueryBuilder();
+        $query->insert('cards')
+            ->values([
+                'carddata' => $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB),
+                'uri' => $query->createNamedParameter($cardUri),
+                'lastmodified' => $query->createNamedParameter(time()),
+                'addressbookid' => $query->createNamedParameter($addressBookId),
+                'size' => $query->createNamedParameter(strlen($cardData)),
+                'etag' => $query->createNamedParameter($etag),
+                'uid' => $query->createNamedParameter($uid),
+            ])
+            ->execute();
+
+        $etagCacheKey = "$addressBookId#$cardUri";
+        $this->etagCache[$etagCacheKey] = $etag;
+
+        $this->addChange($addressBookId, $cardUri, 1);
+        $this->updateProperties($addressBookId, $cardUri, $cardData);
+
+        $addressBookData = $this->getAddressBookById($addressBookId);
+        $shares = $this->getShares($addressBookId);
+        $objectRow = $this->getCard($addressBookId, $cardUri);
+        $this->dispatcher->dispatchTyped(new CardCreatedEvent($addressBookId, $addressBookData, $shares, $objectRow));
+
+        return '"' . $etag . '"';
+    }
+
+    /**
+     * Updates a card.
+     *
+     * The addressbook id will be passed as the first argument. This is the
+     * same id as it is returned from the getAddressBooksForUser method.
+     *
+     * The cardUri is a base uri, and doesn't include the full path. The
+     * cardData argument is the vcard body, and is passed as a string.
+     *
+     * It is possible to return an ETag from this method. This ETag should
+     * match that of the updated resource, and must be enclosed with double
+     * quotes (that is: the string itself must contain the actual quotes).
+     *
+     * You should only return the ETag if you store the carddata as-is. If a
+     * subsequent GET request on the same card does not have the same body,
+     * byte-by-byte and you did return an ETag here, clients tend to get
+     * confused.
+     *
+     * If you don't return an ETag, you can just return null.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @param string $cardData
+     * @return string
+     */
+    public function updateCard($addressBookId, $cardUri, $cardData) {
+        $uid = $this->getUID($cardData);
+        $etag = md5($cardData);
+        $query = $this->db->getQueryBuilder();
+
+        // check for recently stored etag and stop if it is the same
+        $etagCacheKey = "$addressBookId#$cardUri";
+        if (isset($this->etagCache[$etagCacheKey]) && $this->etagCache[$etagCacheKey] === $etag) {
+            return '"' . $etag . '"';
+        }
+
+        $query->update($this->dbCardsTable)
+            ->set('carddata', $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB))
+            ->set('lastmodified', $query->createNamedParameter(time()))
+            ->set('size', $query->createNamedParameter(strlen($cardData)))
+            ->set('etag', $query->createNamedParameter($etag))
+            ->set('uid', $query->createNamedParameter($uid))
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->execute();
+
+        $this->etagCache[$etagCacheKey] = $etag;
+
+        $this->addChange($addressBookId, $cardUri, 2);
+        $this->updateProperties($addressBookId, $cardUri, $cardData);
+
+        $addressBookData = $this->getAddressBookById($addressBookId);
+        $shares = $this->getShares($addressBookId);
+        $objectRow = $this->getCard($addressBookId, $cardUri);
+        $this->dispatcher->dispatchTyped(new CardUpdatedEvent($addressBookId, $addressBookData, $shares, $objectRow));
+        return '"' . $etag . '"';
+    }
+
+    /**
+     * Deletes a card
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @return bool
+     */
+    public function deleteCard($addressBookId, $cardUri) {
+        $addressBookData = $this->getAddressBookById($addressBookId);
+        $shares = $this->getShares($addressBookId);
+        $objectRow = $this->getCard($addressBookId, $cardUri);
+
+        try {
+            $cardId = $this->getCardId($addressBookId, $cardUri);
+        } catch (\InvalidArgumentException $e) {
+            $cardId = null;
+        }
+        $query = $this->db->getQueryBuilder();
+        $ret = $query->delete($this->dbCardsTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
+            ->executeStatement();
+
+        $this->addChange($addressBookId, $cardUri, 3);
+
+        if ($ret === 1) {
+            if ($cardId !== null) {
+                $this->dispatcher->dispatchTyped(new CardDeletedEvent($addressBookId, $addressBookData, $shares, $objectRow));
+                $this->purgeProperties($addressBookId, $cardId);
+            }
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified address book.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
+     * property. This is needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $addressBookId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int|null $limit
+     * @return array
+     */
+    public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
+        // Current synctoken
+        $qb = $this->db->getQueryBuilder();
+        $qb->select('synctoken')
+            ->from('addressbooks')
+            ->where(
+                $qb->expr()->eq('id', $qb->createNamedParameter($addressBookId))
+            );
+        $stmt = $qb->executeQuery();
+        $currentToken = $stmt->fetchOne();
+        $stmt->closeCursor();
+
+        if (is_null($currentToken)) {
+            return [];
+        }
+
+        $result = [
+            'syncToken' => $currentToken,
+            'added' => [],
+            'modified' => [],
+            'deleted' => [],
+        ];
+
+        if ($syncToken) {
+            $qb = $this->db->getQueryBuilder();
+            $qb->select('uri', 'operation')
+                ->from('addressbookchanges')
+                ->where(
+                    $qb->expr()->andX(
+                        $qb->expr()->gte('synctoken', $qb->createNamedParameter($syncToken)),
+                        $qb->expr()->lt('synctoken', $qb->createNamedParameter($currentToken)),
+                        $qb->expr()->eq('addressbookid', $qb->createNamedParameter($addressBookId))
+                    )
+                )->orderBy('synctoken');
+
+            if (is_int($limit) && $limit > 0) {
+                $qb->setMaxResults($limit);
+            }
+
+            // Fetching all changes
+            $stmt = $qb->executeQuery();
+
+            $changes = [];
+
+            // This loop ensures that any duplicates are overwritten, only the
+            // last change on a node is relevant.
+            while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+                $changes[$row['uri']] = $row['operation'];
+            }
+            $stmt->closeCursor();
+
+            foreach ($changes as $uri => $operation) {
+                switch ($operation) {
+                    case 1:
+                        $result['added'][] = $uri;
+                        break;
+                    case 2:
+                        $result['modified'][] = $uri;
+                        break;
+                    case 3:
+                        $result['deleted'][] = $uri;
+                        break;
+                }
+            }
+        } else {
+            $qb = $this->db->getQueryBuilder();
+            $qb->select('uri')
+                ->from('cards')
+                ->where(
+                    $qb->expr()->eq('addressbookid', $qb->createNamedParameter($addressBookId))
+                );
+            // No synctoken supplied, this is the initial sync.
+            $stmt = $qb->executeQuery();
+            $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+            $stmt->closeCursor();
+        }
+        return $result;
+    }
+
+    /**
+     * Adds a change record to the addressbookchanges table.
+     *
+     * @param mixed $addressBookId
+     * @param string $objectUri
+     * @param int $operation 1 = add, 2 = modify, 3 = delete
+     * @return void
+     */
+    protected function addChange($addressBookId, $objectUri, $operation) {
+        $sql = 'INSERT INTO `*PREFIX*addressbookchanges`(`uri`, `synctoken`, `addressbookid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `*PREFIX*addressbooks` WHERE `id` = ?';
+        $stmt = $this->db->prepare($sql);
+        $stmt->execute([
+            $objectUri,
+            $addressBookId,
+            $operation,
+            $addressBookId
+        ]);
+        $stmt = $this->db->prepare('UPDATE `*PREFIX*addressbooks` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?');
+        $stmt->execute([
+            $addressBookId
+        ]);
+    }
+
+    /**
+     * @param resource|string $cardData
+     * @param bool $modified
+     * @return string
+     */
+    private function readBlob($cardData, &$modified = false) {
+        if (is_resource($cardData)) {
+            $cardData = stream_get_contents($cardData);
+        }
+
+        // Micro optimisation
+        // don't loop through
+        if (strpos($cardData, 'PHOTO:data:') === 0) {
+            return $cardData;
+        }
+
+        $cardDataArray = explode("\r\n", $cardData);
+
+        $cardDataFiltered = [];
+        $removingPhoto = false;
+        foreach ($cardDataArray as $line) {
+            if (strpos($line, 'PHOTO:data:') === 0
+                && strpos($line, 'PHOTO:data:image/') !== 0) {
+                // Filter out PHOTO data of non-images
+                $removingPhoto = true;
+                $modified = true;
+                continue;
+            }
+
+            if ($removingPhoto) {
+                if (strpos($line, ' ') === 0) {
+                    continue;
+                }
+                // No leading space means this is a new property
+                $removingPhoto = false;
+            }
+
+            $cardDataFiltered[] = $line;
+        }
+        return implode("\r\n", $cardDataFiltered);
+    }
+
+    /**
+     * @param list<array{href: string, commonName: string, readOnly: bool}> $add
+     * @param list<string> $remove
+     */
+    public function updateShares(IShareable $shareable, array $add, array $remove): void {
+        $addressBookId = $shareable->getResourceId();
+        $addressBookData = $this->getAddressBookById($addressBookId);
+        $oldShares = $this->getShares($addressBookId);
+
+        $this->sharingBackend->updateShares($shareable, $add, $remove);
+
+        $this->dispatcher->dispatchTyped(new AddressBookShareUpdatedEvent($addressBookId, $addressBookData, $oldShares, $add, $remove));
+    }
+
+    /**
+     * Search contacts in a specific address-book
+     *
+     * @param int $addressBookId
+     * @param string $pattern which should match within the $searchProperties
+     * @param array $searchProperties defines the properties within the query pattern should match
+     * @param array $options = array() to define the search behavior
+     *    - 'escape_like_param' - If set to false wildcards _ and % are not escaped, otherwise they are
+     *    - 'limit' - Set a numeric limit for the search results
+     *    - 'offset' - Set the offset for the limited search results
+     *    - 'wildcard' - Whether the search should use wildcards
+     * @psalm-param array{escape_like_param?: bool, limit?: int, offset?: int, wildcard?: bool} $options
+     * @return array an array of contacts which are arrays of key-value-pairs
+     */
+    public function search($addressBookId, $pattern, $searchProperties, $options = []): array {
+        return $this->searchByAddressBookIds([$addressBookId], $pattern, $searchProperties, $options);
+    }
+
+    /**
+     * Search contacts in all address-books accessible by a user
+     *
+     * @param string $principalUri
+     * @param string $pattern
+     * @param array $searchProperties
+     * @param array $options
+     * @return array
+     */
+    public function searchPrincipalUri(string $principalUri,
+                                        string $pattern,
+                                        array $searchProperties,
+                                        array $options = []): array {
+        $addressBookIds = array_map(static function ($row):int {
+            return (int) $row['id'];
+        }, $this->getAddressBooksForUser($principalUri));
+
+        return $this->searchByAddressBookIds($addressBookIds, $pattern, $searchProperties, $options);
+    }
+
+    /**
+     * @param array $addressBookIds
+     * @param string $pattern
+     * @param array $searchProperties
+     * @param array $options
+     * @psalm-param array{types?: bool, escape_like_param?: bool, limit?: int, offset?: int, wildcard?: bool} $options
+     * @return array
+     */
+    private function searchByAddressBookIds(array $addressBookIds,
+                                            string $pattern,
+                                            array $searchProperties,
+                                            array $options = []): array {
+        $escapePattern = !\array_key_exists('escape_like_param', $options) || $options['escape_like_param'] !== false;
+        $useWildcards = !\array_key_exists('wildcard', $options) || $options['wildcard'] !== false;
+
+        $query2 = $this->db->getQueryBuilder();
+
+        $addressBookOr = $query2->expr()->orX();
+        foreach ($addressBookIds as $addressBookId) {
+            $addressBookOr->add($query2->expr()->eq('cp.addressbookid', $query2->createNamedParameter($addressBookId)));
+        }
+
+        if ($addressBookOr->count() === 0) {
+            return [];
+        }
+
+        $propertyOr = $query2->expr()->orX();
+        foreach ($searchProperties as $property) {
+            if ($escapePattern) {
+                if ($property === 'EMAIL' && strpos($pattern, ' ') !== false) {
+                    // There can be no spaces in emails
+                    continue;
+                }
+
+                if ($property === 'CLOUD' && preg_match('/[^a-zA-Z0-9 :_.@\/\-\']/', $pattern) === 1) {
+                    // There can be no chars in cloud ids which are not valid for user ids plus :/
+                    // worst case: CA61590A-BBBC-423E-84AF-E6DF01455A53@https://my.nxt/srv/
+                    continue;
+                }
+            }
+
+            $propertyOr->add($query2->expr()->eq('cp.name', $query2->createNamedParameter($property)));
+        }
+
+        if ($propertyOr->count() === 0) {
+            return [];
+        }
+
+        $query2->selectDistinct('cp.cardid')
+            ->from($this->dbCardsPropertiesTable, 'cp')
+            ->andWhere($addressBookOr)
+            ->andWhere($propertyOr);
+
+        // No need for like when the pattern is empty
+        if ('' !== $pattern) {
+            if (!$useWildcards) {
+                $query2->andWhere($query2->expr()->eq('cp.value', $query2->createNamedParameter($pattern)));
+            } elseif (!$escapePattern) {
+                $query2->andWhere($query2->expr()->ilike('cp.value', $query2->createNamedParameter($pattern)));
+            } else {
+                $query2->andWhere($query2->expr()->ilike('cp.value', $query2->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
+            }
+        }
+
+        if (isset($options['limit'])) {
+            $query2->setMaxResults($options['limit']);
+        }
+        if (isset($options['offset'])) {
+            $query2->setFirstResult($options['offset']);
+        }
+
+        $result = $query2->execute();
+        $matches = $result->fetchAll();
+        $result->closeCursor();
+        $matches = array_map(function ($match) {
+            return (int)$match['cardid'];
+        }, $matches);
+
+        $cards = [];
+        $query = $this->db->getQueryBuilder();
+        $query->select('c.addressbookid', 'c.carddata', 'c.uri')
+            ->from($this->dbCardsTable, 'c')
+            ->where($query->expr()->in('c.id', $query->createParameter('matches')));
+
+        foreach (array_chunk($matches, 1000) as $matchesChunk) {
+            $query->setParameter('matches', $matchesChunk, IQueryBuilder::PARAM_INT_ARRAY);
+            $result = $query->executeQuery();
+            $cards = array_merge($cards, $result->fetchAll());
+            $result->closeCursor();
+        }
+
+        return array_map(function ($array) {
+            $array['addressbookid'] = (int) $array['addressbookid'];
+            $modified = false;
+            $array['carddata'] = $this->readBlob($array['carddata'], $modified);
+            if ($modified) {
+                $array['size'] = strlen($array['carddata']);
+            }
+            return $array;
+        }, $cards);
+    }
+
+    /**
+     * @param int $bookId
+     * @param string $name
+     * @return array
+     */
+    public function collectCardProperties($bookId, $name) {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->selectDistinct('value')
+            ->from($this->dbCardsPropertiesTable)
+            ->where($query->expr()->eq('name', $query->createNamedParameter($name)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($bookId)))
+            ->execute();
+
+        $all = $result->fetchAll(PDO::FETCH_COLUMN);
+        $result->closeCursor();
+
+        return $all;
+    }
+
+    /**
+     * get URI from a given contact
+     *
+     * @param int $id
+     * @return string
+     */
+    public function getCardUri($id) {
+        $query = $this->db->getQueryBuilder();
+        $query->select('uri')->from($this->dbCardsTable)
+            ->where($query->expr()->eq('id', $query->createParameter('id')))
+            ->setParameter('id', $id);
+
+        $result = $query->execute();
+        $uri = $result->fetch();
+        $result->closeCursor();
+
+        if (!isset($uri['uri'])) {
+            throw new \InvalidArgumentException('Card does not exists: ' . $id);
+        }
+
+        return $uri['uri'];
+    }
+
+    /**
+     * return contact with the given URI
+     *
+     * @param int $addressBookId
+     * @param string $uri
+     * @returns array
+     */
+    public function getContact($addressBookId, $uri) {
+        $result = [];
+        $query = $this->db->getQueryBuilder();
+        $query->select('*')->from($this->dbCardsTable)
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
+        $queryResult = $query->execute();
+        $contact = $queryResult->fetch();
+        $queryResult->closeCursor();
+
+        if (is_array($contact)) {
+            $modified = false;
+            $contact['etag'] = '"' . $contact['etag'] . '"';
+            $contact['carddata'] = $this->readBlob($contact['carddata'], $modified);
+            if ($modified) {
+                $contact['size'] = strlen($contact['carddata']);
+            }
+
+            $result = $contact;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Returns the list of people whom this address book is shared with.
+     *
+     * Every element in this array should have the following properties:
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first + last name
+     *   * status - See the Sabre\CalDAV\SharingPlugin::STATUS_ constants.
+     *   * readOnly - boolean
+     *
+     * @return list<array{href: string, commonName: string, status: int, readOnly: bool, '{http://owncloud.org/ns}principal': string, '{http://owncloud.org/ns}group-share': bool}>
+     */
+    public function getShares(int $addressBookId): array {
+        return $this->sharingBackend->getShares($addressBookId);
+    }
+
+    /**
+     * update properties table
+     *
+     * @param int $addressBookId
+     * @param string $cardUri
+     * @param string $vCardSerialized
+     */
+    protected function updateProperties($addressBookId, $cardUri, $vCardSerialized) {
+        $cardId = $this->getCardId($addressBookId, $cardUri);
+        $vCard = $this->readCard($vCardSerialized);
+
+        $this->purgeProperties($addressBookId, $cardId);
+
+        $query = $this->db->getQueryBuilder();
+        $query->insert($this->dbCardsPropertiesTable)
+            ->values(
+                [
+                    'addressbookid' => $query->createNamedParameter($addressBookId),
+                    'cardid' => $query->createNamedParameter($cardId),
+                    'name' => $query->createParameter('name'),
+                    'value' => $query->createParameter('value'),
+                    'preferred' => $query->createParameter('preferred')
+                ]
+            );
+
+
+        $this->db->beginTransaction();
+
+        try {
+            foreach ($vCard->children() as $property) {
+                if (!in_array($property->name, self::$indexProperties)) {
+                    continue;
+                }
+                $preferred = 0;
+                foreach ($property->parameters as $parameter) {
+                    if ($parameter->name === 'TYPE' && strtoupper($parameter->getValue()) === 'PREF') {
+                        $preferred = 1;
+                        break;
+                    }
+                }
+                $query->setParameter('name', $property->name);
+                $query->setParameter('value', mb_strcut($property->getValue(), 0, 254));
+                $query->setParameter('preferred', $preferred);
+                $query->execute();
+            }
+            $this->db->commit();
+        } catch (\Exception $e) {
+            $this->db->rollBack();
+        }
+    }
+
+    /**
+     * read vCard data into a vCard object
+     *
+     * @param string $cardData
+     * @return VCard
+     */
+    protected function readCard($cardData) {
+        return Reader::read($cardData);
+    }
+
+    /**
+     * delete all properties from a given card
+     *
+     * @param int $addressBookId
+     * @param int $cardId
+     */
+    protected function purgeProperties($addressBookId, $cardId) {
+        $query = $this->db->getQueryBuilder();
+        $query->delete($this->dbCardsPropertiesTable)
+            ->where($query->expr()->eq('cardid', $query->createNamedParameter($cardId)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
+        $query->execute();
+    }
+
+    /**
+     * Get ID from a given contact
+     */
+    protected function getCardId(int $addressBookId, string $uri): int {
+        $query = $this->db->getQueryBuilder();
+        $query->select('id')->from($this->dbCardsTable)
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
+
+        $result = $query->execute();
+        $cardIds = $result->fetch();
+        $result->closeCursor();
+
+        if (!isset($cardIds['id'])) {
+            throw new \InvalidArgumentException('Card does not exists: ' . $uri);
+        }
+
+        return (int)$cardIds['id'];
+    }
+
+    /**
+     * For shared address books the sharee is set in the ACL of the address book
+     *
+     * @param int $addressBookId
+     * @param list<array{privilege: string, principal: string, protected: bool}> $acl
+     * @return list<array{privilege: string, principal: string, protected: bool}>
+     */
+    public function applyShareAcl(int $addressBookId, array $acl): array {
+        return $this->sharingBackend->applyShareAcl($addressBookId, $acl);
+    }
+
+    /**
+     * @throws \InvalidArgumentException
+     */
+    public function pruneOutdatedSyncTokens(int $keep = 10_000): int {
+        if ($keep < 0) {
+            throw new \InvalidArgumentException();
+        }
+        $query = $this->db->getQueryBuilder();
+        $query->delete('addressbookchanges')
+            ->orderBy('id', 'DESC')
+            ->setFirstResult($keep);
+        return $query->executeStatement();
+    }
+
+    private function convertPrincipal(string $principalUri, bool $toV2): string {
+        if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
+            [, $name] = \Sabre\Uri\split($principalUri);
+            if ($toV2 === true) {
+                return "principals/users/$name";
+            }
+            return "principals/$name";
+        }
+        return $principalUri;
+    }
+
+    private function addOwnerPrincipal(array &$addressbookInfo): void {
+        $ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
+        $displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
+        if (isset($addressbookInfo[$ownerPrincipalKey])) {
+            $uri = $addressbookInfo[$ownerPrincipalKey];
+        } else {
+            $uri = $addressbookInfo['principaluri'];
+        }
+
+        $principalInformation = $this->principalBackend->getPrincipalByPath($uri);
+        if (isset($principalInformation['{DAV:}displayname'])) {
+            $addressbookInfo[$displaynameKey] = $principalInformation['{DAV:}displayname'];
+        }
+    }
+
+    /**
+     * Extract UID from vcard
+     *
+     * @param string $cardData the vcard raw data
+     * @return string the uid
+     * @throws BadRequest if no UID is available or vcard is empty
+     */
+    private function getUID(string $cardData): string {
+        if ($cardData !== '') {
+            $vCard = Reader::read($cardData);
+            if ($vCard->UID) {
+                $uid = $vCard->UID->getValue();
+                return $uid;
+            }
+            // should already be handled, but just in case
+            throw new BadRequest('vCards on CardDAV servers MUST have a UID property');
+        }
+        // should already be handled, but just in case
+        throw new BadRequest('vCard can not be empty');
+    }
 }

apps/dav/lib/BackgroundJob/PruneOutdatedSyncTokensJob.php

Indentation +22 added lines, -22 removed lines

@@ -35,30 +35,30 @@
 
 class PruneOutdatedSyncTokensJob extends TimedJob {
 
-	private IConfig $config;
-	private LoggerInterface $logger;
-	private CardDavBackend $cardDavBackend;
-	private CalDavBackend $calDavBackend;
+    private IConfig $config;
+    private LoggerInterface $logger;
+    private CardDavBackend $cardDavBackend;
+    private CalDavBackend $calDavBackend;
 
-	public function __construct(ITimeFactory $timeFactory, CalDavBackend $calDavBackend, CardDavBackend $cardDavBackend, IConfig $config, LoggerInterface $logger) {
-		parent::__construct($timeFactory);
-		$this->calDavBackend = $calDavBackend;
-		$this->cardDavBackend = $cardDavBackend;
-		$this->config = $config;
-		$this->logger = $logger;
-		$this->setInterval(60 * 60 * 24); // One day
-		$this->setTimeSensitivity(self::TIME_INSENSITIVE);
-	}
+    public function __construct(ITimeFactory $timeFactory, CalDavBackend $calDavBackend, CardDavBackend $cardDavBackend, IConfig $config, LoggerInterface $logger) {
+        parent::__construct($timeFactory);
+        $this->calDavBackend = $calDavBackend;
+        $this->cardDavBackend = $cardDavBackend;
+        $this->config = $config;
+        $this->logger = $logger;
+        $this->setInterval(60 * 60 * 24); // One day
+        $this->setTimeSensitivity(self::TIME_INSENSITIVE);
+    }
 
-	public function run($argument) {
-		$limit = max(1, (int) $this->config->getAppValue(Application::APP_ID, 'totalNumberOfSyncTokensToKeep', '10000'));
+    public function run($argument) {
+        $limit = max(1, (int) $this->config->getAppValue(Application::APP_ID, 'totalNumberOfSyncTokensToKeep', '10000'));
 
-		$prunedCalendarSyncTokens = $this->calDavBackend->pruneOutdatedSyncTokens($limit);
-		$prunedAddressBookSyncTokens = $this->cardDavBackend->pruneOutdatedSyncTokens($limit);
+        $prunedCalendarSyncTokens = $this->calDavBackend->pruneOutdatedSyncTokens($limit);
+        $prunedAddressBookSyncTokens = $this->cardDavBackend->pruneOutdatedSyncTokens($limit);
 
-		$this->logger->info('Pruned {calendarSyncTokensNumber} calendar sync tokens and {addressBooksSyncTokensNumber} address book sync tokens', [
-			'calendarSyncTokensNumber' => $prunedCalendarSyncTokens,
-			'addressBooksSyncTokensNumber' => $prunedAddressBookSyncTokens
-		]);
-	}
+        $this->logger->info('Pruned {calendarSyncTokensNumber} calendar sync tokens and {addressBooksSyncTokensNumber} address book sync tokens', [
+            'calendarSyncTokensNumber' => $prunedCalendarSyncTokens,
+            'addressBooksSyncTokensNumber' => $prunedAddressBookSyncTokens
+        ]);
+    }
 }

apps/dav/lib/CalDAV/CalDavBackend.php

Indentation +3086 added lines, -3086 removed lines

@@ -121,3090 +121,3090 @@
  */
 class CalDavBackend extends AbstractBackend implements SyncSupport, SubscriptionSupport, SchedulingSupport {
 
-	use TTransactional;
-
-	public const CALENDAR_TYPE_CALENDAR = 0;
-	public const CALENDAR_TYPE_SUBSCRIPTION = 1;
-
-	public const PERSONAL_CALENDAR_URI = 'personal';
-	public const PERSONAL_CALENDAR_NAME = 'Personal';
-
-	public const RESOURCE_BOOKING_CALENDAR_URI = 'calendar';
-	public const RESOURCE_BOOKING_CALENDAR_NAME = 'Calendar';
-
-	/**
-	 * We need to specify a max date, because we need to stop *somewhere*
-	 *
-	 * On 32 bit system the maximum for a signed integer is 2147483647, so
-	 * MAX_DATE cannot be higher than date('Y-m-d', 2147483647) which results
-	 * in 2038-01-19 to avoid problems when the date is converted
-	 * to a unix timestamp.
-	 */
-	public const MAX_DATE = '2038-01-01';
-
-	public const ACCESS_PUBLIC = 4;
-	public const CLASSIFICATION_PUBLIC = 0;
-	public const CLASSIFICATION_PRIVATE = 1;
-	public const CLASSIFICATION_CONFIDENTIAL = 2;
-
-	/**
-	 * List of CalDAV properties, and how they map to database field names and their type
-	 * Add your own properties by simply adding on to this array.
-	 *
-	 * @var array
-	 * @psalm-var array<string, string[]>
-	 */
-	public array $propertyMap = [
-		'{DAV:}displayname' => ['displayname', 'string'],
-		'{urn:ietf:params:xml:ns:caldav}calendar-description' => ['description', 'string'],
-		'{urn:ietf:params:xml:ns:caldav}calendar-timezone' => ['timezone', 'string'],
-		'{http://apple.com/ns/ical/}calendar-order' => ['calendarorder', 'int'],
-		'{http://apple.com/ns/ical/}calendar-color' => ['calendarcolor', 'string'],
-		'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => ['deleted_at', 'int'],
-	];
-
-	/**
-	 * List of subscription properties, and how they map to database field names.
-	 *
-	 * @var array
-	 */
-	public array $subscriptionPropertyMap = [
-		'{DAV:}displayname' => ['displayname', 'string'],
-		'{http://apple.com/ns/ical/}refreshrate' => ['refreshrate', 'string'],
-		'{http://apple.com/ns/ical/}calendar-order' => ['calendarorder', 'int'],
-		'{http://apple.com/ns/ical/}calendar-color' => ['calendarcolor', 'string'],
-		'{http://calendarserver.org/ns/}subscribed-strip-todos' => ['striptodos', 'bool'],
-		'{http://calendarserver.org/ns/}subscribed-strip-alarms' => ['stripalarms', 'string'],
-		'{http://calendarserver.org/ns/}subscribed-strip-attachments' => ['stripattachments', 'string'],
-	];
-
-	/**
-	 * properties to index
-	 *
-	 * This list has to be kept in sync with ICalendarQuery::SEARCH_PROPERTY_*
-	 *
-	 * @see \OCP\Calendar\ICalendarQuery
-	 */
-	private const INDEXED_PROPERTIES = [
-		'CATEGORIES',
-		'COMMENT',
-		'DESCRIPTION',
-		'LOCATION',
-		'RESOURCES',
-		'STATUS',
-		'SUMMARY',
-		'ATTENDEE',
-		'CONTACT',
-		'ORGANIZER'
-	];
-
-	/** @var array parameters to index */
-	public static array $indexParameters = [
-		'ATTENDEE' => ['CN'],
-		'ORGANIZER' => ['CN'],
-	];
-
-	/**
-	 * @var string[] Map of uid => display name
-	 */
-	protected array $userDisplayNames;
-
-	private IDBConnection $db;
-	private Backend $calendarSharingBackend;
-	private Principal $principalBackend;
-	private IUserManager $userManager;
-	private ISecureRandom $random;
-	private LoggerInterface $logger;
-	private IEventDispatcher $dispatcher;
-	private IConfig $config;
-	private bool $legacyEndpoint;
-	private string $dbObjectPropertiesTable = 'calendarobjects_props';
-
-	public function __construct(IDBConnection $db,
-								Principal $principalBackend,
-								IUserManager $userManager,
-								IGroupManager $groupManager,
-								ISecureRandom $random,
-								LoggerInterface $logger,
-								IEventDispatcher $dispatcher,
-								IConfig $config,
-								bool $legacyEndpoint = false) {
-		$this->db = $db;
-		$this->principalBackend = $principalBackend;
-		$this->userManager = $userManager;
-		$this->calendarSharingBackend = new Backend($this->db, $this->userManager, $groupManager, $principalBackend, 'calendar');
-		$this->random = $random;
-		$this->logger = $logger;
-		$this->dispatcher = $dispatcher;
-		$this->config = $config;
-		$this->legacyEndpoint = $legacyEndpoint;
-	}
-
-	/**
-	 * Return the number of calendars for a principal
-	 *
-	 * By default this excludes the automatically generated birthday calendar
-	 *
-	 * @param $principalUri
-	 * @param bool $excludeBirthday
-	 * @return int
-	 */
-	public function getCalendarsForUserCount($principalUri, $excludeBirthday = true) {
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$query = $this->db->getQueryBuilder();
-		$query->select($query->func()->count('*'))
-			->from('calendars');
-
-		if ($principalUri === '') {
-			$query->where($query->expr()->emptyString('principaluri'));
-		} else {
-			$query->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-		}
-
-		if ($excludeBirthday) {
-			$query->andWhere($query->expr()->neq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)));
-		}
-
-		$result = $query->executeQuery();
-		$column = (int)$result->fetchOne();
-		$result->closeCursor();
-		return $column;
-	}
-
-	/**
-	 * @return array{id: int, deleted_at: int}[]
-	 */
-	public function getDeletedCalendars(int $deletedBefore): array {
-		$qb = $this->db->getQueryBuilder();
-		$qb->select(['id', 'deleted_at'])
-			->from('calendars')
-			->where($qb->expr()->isNotNull('deleted_at'))
-			->andWhere($qb->expr()->lt('deleted_at', $qb->createNamedParameter($deletedBefore)));
-		$result = $qb->executeQuery();
-		$raw = $result->fetchAll();
-		$result->closeCursor();
-		return array_map(function ($row) {
-			return [
-				'id' => (int) $row['id'],
-				'deleted_at' => (int) $row['deleted_at'],
-			];
-		}, $raw);
-	}
-
-	/**
-	 * Returns a list of calendars for a principal.
-	 *
-	 * Every project is an array with the following keys:
-	 *  * id, a unique id that will be used by other functions to modify the
-	 *    calendar. This can be the same as the uri or a database key.
-	 *  * uri, which the basename of the uri with which the calendar is
-	 *    accessed.
-	 *  * principaluri. The owner of the calendar. Almost always the same as
-	 *    principalUri passed to this method.
-	 *
-	 * Furthermore it can contain webdav properties in clark notation. A very
-	 * common one is '{DAV:}displayname'.
-	 *
-	 * Many clients also require:
-	 * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
-	 * For this property, you can just return an instance of
-	 * Sabre\CalDAV\Property\SupportedCalendarComponentSet.
-	 *
-	 * If you return {http://sabredav.org/ns}read-only and set the value to 1,
-	 * ACL will automatically be put in read-only mode.
-	 *
-	 * @param string $principalUri
-	 * @return array
-	 */
-	public function getCalendarsForUser($principalUri) {
-		$principalUriOriginal = $principalUri;
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'synctoken';
-		$fields[] = 'components';
-		$fields[] = 'principaluri';
-		$fields[] = 'transparent';
-
-		// Making fields a comma-delimited list
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)
-			->from('calendars')
-			->orderBy('calendarorder', 'ASC');
-
-		if ($principalUri === '') {
-			$query->where($query->expr()->emptyString('principaluri'));
-		} else {
-			$query->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-		}
-
-		$result = $query->executeQuery();
-
-		$calendars = [];
-		while ($row = $result->fetch()) {
-			$row['principaluri'] = (string) $row['principaluri'];
-			$components = [];
-			if ($row['components']) {
-				$components = explode(',',$row['components']);
-			}
-
-			$calendar = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-				'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($principalUri, !$this->legacyEndpoint),
-			];
-
-			$calendar = $this->rowToCalendar($row, $calendar);
-			$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-			$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-			if (!isset($calendars[$calendar['id']])) {
-				$calendars[$calendar['id']] = $calendar;
-			}
-		}
-		$result->closeCursor();
-
-		// query for shared calendars
-		$principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
-		$principals = array_merge($principals, $this->principalBackend->getCircleMembership($principalUriOriginal));
-
-		$principals[] = $principalUri;
-
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'a.id';
-		$fields[] = 'a.uri';
-		$fields[] = 'a.synctoken';
-		$fields[] = 'a.components';
-		$fields[] = 'a.principaluri';
-		$fields[] = 'a.transparent';
-		$fields[] = 's.access';
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)
-			->from('dav_shares', 's')
-			->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
-			->where($query->expr()->in('s.principaluri', $query->createParameter('principaluri')))
-			->andWhere($query->expr()->eq('s.type', $query->createParameter('type')))
-			->setParameter('type', 'calendar')
-			->setParameter('principaluri', $principals, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY);
-
-		$result = $query->executeQuery();
-
-		$readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
-		while ($row = $result->fetch()) {
-			$row['principaluri'] = (string) $row['principaluri'];
-			if ($row['principaluri'] === $principalUri) {
-				continue;
-			}
-
-			$readOnly = (int) $row['access'] === Backend::ACCESS_READ;
-			if (isset($calendars[$row['id']])) {
-				if ($readOnly) {
-					// New share can not have more permissions then the old one.
-					continue;
-				}
-				if (isset($calendars[$row['id']][$readOnlyPropertyName]) &&
-					$calendars[$row['id']][$readOnlyPropertyName] === 0) {
-					// Old share is already read-write, no more permissions can be gained
-					continue;
-				}
-			}
-
-			[, $name] = Uri\split($row['principaluri']);
-			$uri = $row['uri'] . '_shared_by_' . $name;
-			$row['displayname'] = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
-			$components = [];
-			if ($row['components']) {
-				$components = explode(',',$row['components']);
-			}
-			$calendar = [
-				'id' => $row['id'],
-				'uri' => $uri,
-				'principaluri' => $this->convertPrincipal($principalUri, !$this->legacyEndpoint),
-				'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp('transparent'),
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-				$readOnlyPropertyName => $readOnly,
-			];
-
-			$calendar = $this->rowToCalendar($row, $calendar);
-			$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-			$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-			$calendars[$calendar['id']] = $calendar;
-		}
-		$result->closeCursor();
-
-		return array_values($calendars);
-	}
-
-	/**
-	 * @param $principalUri
-	 * @return array
-	 */
-	public function getUsersOwnCalendars($principalUri) {
-		$principalUri = $this->convertPrincipal($principalUri, true);
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'synctoken';
-		$fields[] = 'components';
-		$fields[] = 'principaluri';
-		$fields[] = 'transparent';
-		// Making fields a comma-delimited list
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)->from('calendars')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-			->orderBy('calendarorder', 'ASC');
-		$stmt = $query->executeQuery();
-		$calendars = [];
-		while ($row = $stmt->fetch()) {
-			$row['principaluri'] = (string) $row['principaluri'];
-			$components = [];
-			if ($row['components']) {
-				$components = explode(',',$row['components']);
-			}
-			$calendar = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-				'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-			];
-
-			$calendar = $this->rowToCalendar($row, $calendar);
-			$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-			$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-			if (!isset($calendars[$calendar['id']])) {
-				$calendars[$calendar['id']] = $calendar;
-			}
-		}
-		$stmt->closeCursor();
-		return array_values($calendars);
-	}
-
-
-	/**
-	 * @param $uid
-	 * @return string
-	 */
-	private function getUserDisplayName($uid) {
-		if (!isset($this->userDisplayNames[$uid])) {
-			$user = $this->userManager->get($uid);
-
-			if ($user instanceof IUser) {
-				$this->userDisplayNames[$uid] = $user->getDisplayName();
-			} else {
-				$this->userDisplayNames[$uid] = $uid;
-			}
-		}
-
-		return $this->userDisplayNames[$uid];
-	}
-
-	/**
-	 * @return array
-	 */
-	public function getPublicCalendars() {
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'a.id';
-		$fields[] = 'a.uri';
-		$fields[] = 'a.synctoken';
-		$fields[] = 'a.components';
-		$fields[] = 'a.principaluri';
-		$fields[] = 'a.transparent';
-		$fields[] = 's.access';
-		$fields[] = 's.publicuri';
-		$calendars = [];
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select($fields)
-			->from('dav_shares', 's')
-			->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
-			->where($query->expr()->in('s.access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
-			->andWhere($query->expr()->eq('s.type', $query->createNamedParameter('calendar')))
-			->executeQuery();
-
-		while ($row = $result->fetch()) {
-			$row['principaluri'] = (string) $row['principaluri'];
-			[, $name] = Uri\split($row['principaluri']);
-			$row['displayname'] = $row['displayname'] . "($name)";
-			$components = [];
-			if ($row['components']) {
-				$components = explode(',',$row['components']);
-			}
-			$calendar = [
-				'id' => $row['id'],
-				'uri' => $row['publicuri'],
-				'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-				'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], $this->legacyEndpoint),
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only' => (int)$row['access'] === Backend::ACCESS_READ,
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}public' => (int)$row['access'] === self::ACCESS_PUBLIC,
-			];
-
-			$calendar = $this->rowToCalendar($row, $calendar);
-			$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-			$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-			if (!isset($calendars[$calendar['id']])) {
-				$calendars[$calendar['id']] = $calendar;
-			}
-		}
-		$result->closeCursor();
-
-		return array_values($calendars);
-	}
-
-	/**
-	 * @param string $uri
-	 * @return array
-	 * @throws NotFound
-	 */
-	public function getPublicCalendar($uri) {
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'a.id';
-		$fields[] = 'a.uri';
-		$fields[] = 'a.synctoken';
-		$fields[] = 'a.components';
-		$fields[] = 'a.principaluri';
-		$fields[] = 'a.transparent';
-		$fields[] = 's.access';
-		$fields[] = 's.publicuri';
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select($fields)
-			->from('dav_shares', 's')
-			->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
-			->where($query->expr()->in('s.access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
-			->andWhere($query->expr()->eq('s.type', $query->createNamedParameter('calendar')))
-			->andWhere($query->expr()->eq('s.publicuri', $query->createNamedParameter($uri)))
-			->executeQuery();
-
-		$row = $result->fetch();
-
-		$result->closeCursor();
-
-		if ($row === false) {
-			throw new NotFound('Node with name \'' . $uri . '\' could not be found');
-		}
-
-		$row['principaluri'] = (string) $row['principaluri'];
-		[, $name] = Uri\split($row['principaluri']);
-		$row['displayname'] = $row['displayname'] . ' ' . "($name)";
-		$components = [];
-		if ($row['components']) {
-			$components = explode(',',$row['components']);
-		}
-		$calendar = [
-			'id' => $row['id'],
-			'uri' => $row['publicuri'],
-			'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-			'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-			'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-			'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-			'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-			'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only' => (int)$row['access'] === Backend::ACCESS_READ,
-			'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}public' => (int)$row['access'] === self::ACCESS_PUBLIC,
-		];
-
-		$calendar = $this->rowToCalendar($row, $calendar);
-		$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-		$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-		return $calendar;
-	}
-
-	/**
-	 * @param string $principal
-	 * @param string $uri
-	 * @return array|null
-	 */
-	public function getCalendarByUri($principal, $uri) {
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'synctoken';
-		$fields[] = 'components';
-		$fields[] = 'principaluri';
-		$fields[] = 'transparent';
-
-		// Making fields a comma-delimited list
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)->from('calendars')
-			->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
-			->andWhere($query->expr()->eq('principaluri', $query->createNamedParameter($principal)))
-			->setMaxResults(1);
-		$stmt = $query->executeQuery();
-
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-		if ($row === false) {
-			return null;
-		}
-
-		$row['principaluri'] = (string) $row['principaluri'];
-		$components = [];
-		if ($row['components']) {
-			$components = explode(',',$row['components']);
-		}
-
-		$calendar = [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-			'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-			'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-			'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-		];
-
-		$calendar = $this->rowToCalendar($row, $calendar);
-		$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-		$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-		return $calendar;
-	}
-
-	/**
-	 * @return array{id: int, uri: string, '{http://calendarserver.org/ns/}getctag': string, '{http://sabredav.org/ns}sync-token': int, '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set': SupportedCalendarComponentSet, '{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp': ScheduleCalendarTransp }|null
-	 */
-	public function getCalendarById(int $calendarId): ?array {
-		$fields = array_column($this->propertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'synctoken';
-		$fields[] = 'components';
-		$fields[] = 'principaluri';
-		$fields[] = 'transparent';
-
-		// Making fields a comma-delimited list
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)->from('calendars')
-			->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)))
-			->setMaxResults(1);
-		$stmt = $query->executeQuery();
-
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-		if ($row === false) {
-			return null;
-		}
-
-		$row['principaluri'] = (string) $row['principaluri'];
-		$components = [];
-		if ($row['components']) {
-			$components = explode(',',$row['components']);
-		}
-
-		$calendar = [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
-			'{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?? 0,
-			'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
-			'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-		];
-
-		$calendar = $this->rowToCalendar($row, $calendar);
-		$calendar = $this->addOwnerPrincipalToCalendar($calendar);
-		$calendar = $this->addResourceTypeToCalendar($row, $calendar);
-
-		return $calendar;
-	}
-
-	/**
-	 * @param $subscriptionId
-	 */
-	public function getSubscriptionById($subscriptionId) {
-		$fields = array_column($this->subscriptionPropertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'source';
-		$fields[] = 'synctoken';
-		$fields[] = 'principaluri';
-		$fields[] = 'lastmodified';
-
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)
-			->from('calendarsubscriptions')
-			->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
-			->orderBy('calendarorder', 'asc');
-		$stmt = $query->executeQuery();
-
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-		if ($row === false) {
-			return null;
-		}
-
-		$row['principaluri'] = (string) $row['principaluri'];
-		$subscription = [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'principaluri' => $row['principaluri'],
-			'source' => $row['source'],
-			'lastmodified' => $row['lastmodified'],
-			'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-		];
-
-		return $this->rowToSubscription($row, $subscription);
-	}
-
-	/**
-	 * Creates a new calendar for a principal.
-	 *
-	 * If the creation was a success, an id must be returned that can be used to reference
-	 * this calendar in other methods, such as updateCalendar.
-	 *
-	 * @param string $principalUri
-	 * @param string $calendarUri
-	 * @param array $properties
-	 * @return int
-	 *
-	 * @throws CalendarException
-	 */
-	public function createCalendar($principalUri, $calendarUri, array $properties) {
-		if (strlen($calendarUri) > 255) {
-			throw new CalendarException('URI too long. Calendar not created');
-		}
-
-		$values = [
-			'principaluri' => $this->convertPrincipal($principalUri, true),
-			'uri' => $calendarUri,
-			'synctoken' => 1,
-			'transparent' => 0,
-			'components' => 'VEVENT,VTODO',
-			'displayname' => $calendarUri
-		];
-
-		// Default value
-		$sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
-		if (isset($properties[$sccs])) {
-			if (!($properties[$sccs] instanceof SupportedCalendarComponentSet)) {
-				throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
-			}
-			$values['components'] = implode(',',$properties[$sccs]->getValue());
-		} elseif (isset($properties['components'])) {
-			// Allow to provide components internally without having
-			// to create a SupportedCalendarComponentSet object
-			$values['components'] = $properties['components'];
-		}
-
-		$transp = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
-		if (isset($properties[$transp])) {
-			$values['transparent'] = (int) ($properties[$transp]->getValue() === 'transparent');
-		}
-
-		foreach ($this->propertyMap as $xmlName => [$dbName, $type]) {
-			if (isset($properties[$xmlName])) {
-				$values[$dbName] = $properties[$xmlName];
-			}
-		}
-
-		[$calendarId, $calendarData] = $this->atomic(function() use ($values) {
-			$query = $this->db->getQueryBuilder();
-			$query->insert('calendars');
-			foreach ($values as $column => $value) {
-				$query->setValue($column, $query->createNamedParameter($value));
-			}
-			$query->executeStatement();
-			$calendarId = $query->getLastInsertId();
-
-			$calendarData = $this->getCalendarById($calendarId);
-			return [$calendarId, $calendarData];
-		}, $this->db);
-
-		$this->dispatcher->dispatchTyped(new CalendarCreatedEvent((int)$calendarId, $calendarData));
-
-		return $calendarId;
-	}
-
-	/**
-	 * Updates properties for a calendar.
-	 *
-	 * The list of mutations is stored in a Sabre\DAV\PropPatch object.
-	 * To do the actual updates, you must tell this object which properties
-	 * you're going to process with the handle() method.
-	 *
-	 * Calling the handle method is like telling the PropPatch object "I
-	 * promise I can handle updating this property".
-	 *
-	 * Read the PropPatch documentation for more info and examples.
-	 *
-	 * @param mixed $calendarId
-	 * @param PropPatch $propPatch
-	 * @return void
-	 */
-	public function updateCalendar($calendarId, PropPatch $propPatch) {
-		$supportedProperties = array_keys($this->propertyMap);
-		$supportedProperties[] = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
-
-		$propPatch->handle($supportedProperties, function ($mutations) use ($calendarId) {
-			$newValues = [];
-			foreach ($mutations as $propertyName => $propertyValue) {
-				switch ($propertyName) {
-					case '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp':
-						$fieldName = 'transparent';
-						$newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
-						break;
-					default:
-						$fieldName = $this->propertyMap[$propertyName][0];
-						$newValues[$fieldName] = $propertyValue;
-						break;
-				}
-			}
-			$query = $this->db->getQueryBuilder();
-			$query->update('calendars');
-			foreach ($newValues as $fieldName => $value) {
-				$query->set($fieldName, $query->createNamedParameter($value));
-			}
-			$query->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)));
-			$query->executeStatement();
-
-			$this->addChange($calendarId, "", 2);
-
-			$calendarData = $this->getCalendarById($calendarId);
-			$shares = $this->getShares($calendarId);
-			$this->dispatcher->dispatchTyped(new CalendarUpdatedEvent($calendarId, $calendarData, $shares, $mutations));
-
-			return true;
-		});
-	}
-
-	/**
-	 * Delete a calendar and all it's objects
-	 *
-	 * @param mixed $calendarId
-	 * @return void
-	 */
-	public function deleteCalendar($calendarId, bool $forceDeletePermanently = false) {
-		// The calendar is deleted right away if this is either enforced by the caller
-		// or the special contacts birthday calendar or when the preference of an empty
-		// retention (0 seconds) is set, which signals a disabled trashbin.
-		$calendarData = $this->getCalendarById($calendarId);
-		$isBirthdayCalendar = isset($calendarData['uri']) && $calendarData['uri'] === BirthdayService::BIRTHDAY_CALENDAR_URI;
-		$trashbinDisabled = $this->config->getAppValue(Application::APP_ID, RetentionService::RETENTION_CONFIG_KEY) === '0';
-		if ($forceDeletePermanently || $isBirthdayCalendar || $trashbinDisabled) {
-			$calendarData = $this->getCalendarById($calendarId);
-			$shares = $this->getShares($calendarId);
-
-			$qbDeleteCalendarObjectProps = $this->db->getQueryBuilder();
-			$qbDeleteCalendarObjectProps->delete($this->dbObjectPropertiesTable)
-				->where($qbDeleteCalendarObjectProps->expr()->eq('calendarid', $qbDeleteCalendarObjectProps->createNamedParameter($calendarId)))
-				->andWhere($qbDeleteCalendarObjectProps->expr()->eq('calendartype', $qbDeleteCalendarObjectProps->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
-				->executeStatement();
-
-			$qbDeleteCalendarObjects = $this->db->getQueryBuilder();
-			$qbDeleteCalendarObjects->delete('calendarobjects')
-				->where($qbDeleteCalendarObjects->expr()->eq('calendarid', $qbDeleteCalendarObjects->createNamedParameter($calendarId)))
-				->andWhere($qbDeleteCalendarObjects->expr()->eq('calendartype', $qbDeleteCalendarObjects->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
-				->executeStatement();
-
-			$qbDeleteCalendarChanges = $this->db->getQueryBuilder();
-			$qbDeleteCalendarObjects->delete('calendarchanges')
-				->where($qbDeleteCalendarChanges->expr()->eq('calendarid', $qbDeleteCalendarChanges->createNamedParameter($calendarId)))
-				->andWhere($qbDeleteCalendarChanges->expr()->eq('calendartype', $qbDeleteCalendarChanges->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
-				->executeStatement();
-
-			$this->calendarSharingBackend->deleteAllShares($calendarId);
-
-			$qbDeleteCalendar = $this->db->getQueryBuilder();
-			$qbDeleteCalendarObjects->delete('calendars')
-				->where($qbDeleteCalendar->expr()->eq('id', $qbDeleteCalendar->createNamedParameter($calendarId)))
-				->executeStatement();
-
-			// Only dispatch if we actually deleted anything
-			if ($calendarData) {
-				$this->dispatcher->dispatchTyped(new CalendarDeletedEvent($calendarId, $calendarData, $shares));
-			}
-		} else {
-			$qbMarkCalendarDeleted = $this->db->getQueryBuilder();
-			$qbMarkCalendarDeleted->update('calendars')
-				->set('deleted_at', $qbMarkCalendarDeleted->createNamedParameter(time()))
-				->where($qbMarkCalendarDeleted->expr()->eq('id', $qbMarkCalendarDeleted->createNamedParameter($calendarId)))
-				->executeStatement();
-
-			$calendarData = $this->getCalendarById($calendarId);
-			$shares = $this->getShares($calendarId);
-			if ($calendarData) {
-				$this->dispatcher->dispatchTyped(new CalendarMovedToTrashEvent(
-					$calendarId,
-					$calendarData,
-					$shares
-				));
-			}
-		}
-	}
-
-	public function restoreCalendar(int $id): void {
-		$qb = $this->db->getQueryBuilder();
-		$update = $qb->update('calendars')
-			->set('deleted_at', $qb->createNamedParameter(null))
-			->where($qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
-		$update->executeStatement();
-
-		$calendarData = $this->getCalendarById($id);
-		$shares = $this->getShares($id);
-		if ($calendarData === null) {
-			throw new RuntimeException('Calendar data that was just written can\'t be read back. Check your database configuration.');
-		}
-		$this->dispatcher->dispatchTyped(new CalendarRestoredEvent(
-			$id,
-			$calendarData,
-			$shares
-		));
-	}
-
-	/**
-	 * Delete all of an user's shares
-	 *
-	 * @param string $principaluri
-	 * @return void
-	 */
-	public function deleteAllSharesByUser($principaluri) {
-		$this->calendarSharingBackend->deleteAllSharesByUser($principaluri);
-	}
-
-	/**
-	 * Returns all calendar objects within a calendar.
-	 *
-	 * Every item contains an array with the following keys:
-	 *   * calendardata - The iCalendar-compatible calendar data
-	 *   * uri - a unique key which will be used to construct the uri. This can
-	 *     be any arbitrary string, but making sure it ends with '.ics' is a
-	 *     good idea. This is only the basename, or filename, not the full
-	 *     path.
-	 *   * lastmodified - a timestamp of the last modification time
-	 *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
-	 *   '"abcdef"')
-	 *   * size - The size of the calendar objects, in bytes.
-	 *   * component - optional, a string containing the type of object, such
-	 *     as 'vevent' or 'vtodo'. If specified, this will be used to populate
-	 *     the Content-Type header.
-	 *
-	 * Note that the etag is optional, but it's highly encouraged to return for
-	 * speed reasons.
-	 *
-	 * The calendardata is also optional. If it's not returned
-	 * 'getCalendarObject' will be called later, which *is* expected to return
-	 * calendardata.
-	 *
-	 * If neither etag or size are specified, the calendardata will be
-	 * used/fetched to determine these numbers. If both are specified the
-	 * amount of times this is needed is reduced by a great degree.
-	 *
-	 * @param mixed $calendarId
-	 * @param int $calendarType
-	 * @return array
-	 */
-	public function getCalendarObjects($calendarId, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'componenttype', 'classification'])
-			->from('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
-			->andWhere($query->expr()->isNull('deleted_at'));
-		$stmt = $query->executeQuery();
-
-		$result = [];
-		foreach ($stmt->fetchAll() as $row) {
-			$result[] = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'lastmodified' => $row['lastmodified'],
-				'etag' => '"' . $row['etag'] . '"',
-				'calendarid' => $row['calendarid'],
-				'size' => (int)$row['size'],
-				'component' => strtolower($row['componenttype']),
-				'classification' => (int)$row['classification']
-			];
-		}
-		$stmt->closeCursor();
-
-		return $result;
-	}
-
-	public function getDeletedCalendarObjects(int $deletedBefore): array {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.calendartype', 'co.size', 'co.componenttype', 'co.classification', 'co.deleted_at'])
-			->from('calendarobjects', 'co')
-			->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
-			->where($query->expr()->isNotNull('co.deleted_at'))
-			->andWhere($query->expr()->lt('co.deleted_at', $query->createNamedParameter($deletedBefore)));
-		$stmt = $query->executeQuery();
-
-		$result = [];
-		foreach ($stmt->fetchAll() as $row) {
-			$result[] = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'lastmodified' => $row['lastmodified'],
-				'etag' => '"' . $row['etag'] . '"',
-				'calendarid' => (int) $row['calendarid'],
-				'calendartype' => (int) $row['calendartype'],
-				'size' => (int) $row['size'],
-				'component' => strtolower($row['componenttype']),
-				'classification' => (int) $row['classification'],
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
-			];
-		}
-		$stmt->closeCursor();
-
-		return $result;
-	}
-
-	/**
-	 * Return all deleted calendar objects by the given principal that are not
-	 * in deleted calendars.
-	 *
-	 * @param string $principalUri
-	 * @return array
-	 * @throws Exception
-	 */
-	public function getDeletedCalendarObjectsByPrincipal(string $principalUri): array {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.size', 'co.componenttype', 'co.classification', 'co.deleted_at'])
-			->selectAlias('c.uri', 'calendaruri')
-			->from('calendarobjects', 'co')
-			->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-			->andWhere($query->expr()->isNotNull('co.deleted_at'))
-			->andWhere($query->expr()->isNull('c.deleted_at'));
-		$stmt = $query->executeQuery();
-
-		$result = [];
-		while ($row = $stmt->fetch()) {
-			$result[] = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'lastmodified' => $row['lastmodified'],
-				'etag' => '"' . $row['etag'] . '"',
-				'calendarid' => $row['calendarid'],
-				'calendaruri' => $row['calendaruri'],
-				'size' => (int)$row['size'],
-				'component' => strtolower($row['componenttype']),
-				'classification' => (int)$row['classification'],
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
-			];
-		}
-		$stmt->closeCursor();
-
-		return $result;
-	}
-
-	/**
-	 * Returns information from a single calendar object, based on it's object
-	 * uri.
-	 *
-	 * The object uri is only the basename, or filename and not a full path.
-	 *
-	 * The returned array must have the same keys as getCalendarObjects. The
-	 * 'calendardata' object is required here though, while it's not required
-	 * for getCalendarObjects.
-	 *
-	 * This method must return null if the object did not exist.
-	 *
-	 * @param mixed $calendarId
-	 * @param string $objectUri
-	 * @param int $calendarType
-	 * @return array|null
-	 */
-	public function getCalendarObject($calendarId, $objectUri, int $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'calendardata', 'componenttype', 'classification', 'deleted_at'])
-			->from('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)));
-		$stmt = $query->executeQuery();
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-
-		if (!$row) {
-			return null;
-		}
-
-		return [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'lastmodified' => $row['lastmodified'],
-			'etag' => '"' . $row['etag'] . '"',
-			'calendarid' => $row['calendarid'],
-			'size' => (int)$row['size'],
-			'calendardata' => $this->readBlob($row['calendardata']),
-			'component' => strtolower($row['componenttype']),
-			'classification' => (int)$row['classification'],
-			'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
-		];
-	}
-
-	/**
-	 * Returns a list of calendar objects.
-	 *
-	 * This method should work identical to getCalendarObject, but instead
-	 * return all the calendar objects in the list as an array.
-	 *
-	 * If the backend supports this, it may allow for some speed-ups.
-	 *
-	 * @param mixed $calendarId
-	 * @param string[] $uris
-	 * @param int $calendarType
-	 * @return array
-	 */
-	public function getMultipleCalendarObjects($calendarId, array $uris, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
-		if (empty($uris)) {
-			return [];
-		}
-
-		$chunks = array_chunk($uris, 100);
-		$objects = [];
-
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'calendardata', 'componenttype', 'classification'])
-			->from('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->in('uri', $query->createParameter('uri')))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
-			->andWhere($query->expr()->isNull('deleted_at'));
-
-		foreach ($chunks as $uris) {
-			$query->setParameter('uri', $uris, IQueryBuilder::PARAM_STR_ARRAY);
-			$result = $query->executeQuery();
-
-			while ($row = $result->fetch()) {
-				$objects[] = [
-					'id' => $row['id'],
-					'uri' => $row['uri'],
-					'lastmodified' => $row['lastmodified'],
-					'etag' => '"' . $row['etag'] . '"',
-					'calendarid' => $row['calendarid'],
-					'size' => (int)$row['size'],
-					'calendardata' => $this->readBlob($row['calendardata']),
-					'component' => strtolower($row['componenttype']),
-					'classification' => (int)$row['classification']
-				];
-			}
-			$result->closeCursor();
-		}
-
-		return $objects;
-	}
-
-	/**
-	 * Creates a new calendar object.
-	 *
-	 * The object uri is only the basename, or filename and not a full path.
-	 *
-	 * It is possible return an etag from this function, which will be used in
-	 * the response to this PUT request. Note that the ETag must be surrounded
-	 * by double-quotes.
-	 *
-	 * However, you should only really return this ETag if you don't mangle the
-	 * calendar-data. If the result of a subsequent GET to this object is not
-	 * the exact same as this request body, you should omit the ETag.
-	 *
-	 * @param mixed $calendarId
-	 * @param string $objectUri
-	 * @param string $calendarData
-	 * @param int $calendarType
-	 * @return string
-	 */
-	public function createCalendarObject($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		$extraData = $this->getDenormalizedData($calendarData);
-
-		// Try to detect duplicates
-		$qb = $this->db->getQueryBuilder();
-		$qb->select($qb->func()->count('*'))
-			->from('calendarobjects')
-			->where($qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)))
-			->andWhere($qb->expr()->eq('uid', $qb->createNamedParameter($extraData['uid'])))
-			->andWhere($qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType)))
-			->andWhere($qb->expr()->isNull('deleted_at'));
-		$result = $qb->executeQuery();
-		$count = (int) $result->fetchOne();
-		$result->closeCursor();
-
-		if ($count !== 0) {
-			throw new BadRequest('Calendar object with uid already exists in this calendar collection.');
-		}
-		// For a more specific error message we also try to explicitly look up the UID but as a deleted entry
-		$qbDel = $this->db->getQueryBuilder();
-		$qbDel->select($qb->func()->count('*'))
-			->from('calendarobjects')
-			->where($qbDel->expr()->eq('calendarid', $qbDel->createNamedParameter($calendarId)))
-			->andWhere($qbDel->expr()->eq('uid', $qbDel->createNamedParameter($extraData['uid'])))
-			->andWhere($qbDel->expr()->eq('calendartype', $qbDel->createNamedParameter($calendarType)))
-			->andWhere($qbDel->expr()->isNotNull('deleted_at'));
-		$result = $qbDel->executeQuery();
-		$count = (int) $result->fetchOne();
-		$result->closeCursor();
-		if ($count !== 0) {
-			throw new BadRequest('Deleted calendar object with uid already exists in this calendar collection.');
-		}
-
-		$query = $this->db->getQueryBuilder();
-		$query->insert('calendarobjects')
-			->values([
-				'calendarid' => $query->createNamedParameter($calendarId),
-				'uri' => $query->createNamedParameter($objectUri),
-				'calendardata' => $query->createNamedParameter($calendarData, IQueryBuilder::PARAM_LOB),
-				'lastmodified' => $query->createNamedParameter(time()),
-				'etag' => $query->createNamedParameter($extraData['etag']),
-				'size' => $query->createNamedParameter($extraData['size']),
-				'componenttype' => $query->createNamedParameter($extraData['componentType']),
-				'firstoccurence' => $query->createNamedParameter($extraData['firstOccurence']),
-				'lastoccurence' => $query->createNamedParameter($extraData['lastOccurence']),
-				'classification' => $query->createNamedParameter($extraData['classification']),
-				'uid' => $query->createNamedParameter($extraData['uid']),
-				'calendartype' => $query->createNamedParameter($calendarType),
-			])
-			->executeStatement();
-
-		$this->updateProperties($calendarId, $objectUri, $calendarData, $calendarType);
-		$this->addChange($calendarId, $objectUri, 1, $calendarType);
-
-		$objectRow = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
-		assert($objectRow !== null);
-
-		if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
-			$calendarRow = $this->getCalendarById($calendarId);
-			$shares = $this->getShares($calendarId);
-
-			$this->dispatcher->dispatchTyped(new CalendarObjectCreatedEvent($calendarId, $calendarRow, $shares, $objectRow));
-		} else {
-			$subscriptionRow = $this->getSubscriptionById($calendarId);
-
-			$this->dispatcher->dispatchTyped(new CachedCalendarObjectCreatedEvent($calendarId, $subscriptionRow, [], $objectRow));
-		}
-
-		return '"' . $extraData['etag'] . '"';
-	}
-
-	/**
-	 * Updates an existing calendarobject, based on it's uri.
-	 *
-	 * The object uri is only the basename, or filename and not a full path.
-	 *
-	 * It is possible return an etag from this function, which will be used in
-	 * the response to this PUT request. Note that the ETag must be surrounded
-	 * by double-quotes.
-	 *
-	 * However, you should only really return this ETag if you don't mangle the
-	 * calendar-data. If the result of a subsequent GET to this object is not
-	 * the exact same as this request body, you should omit the ETag.
-	 *
-	 * @param mixed $calendarId
-	 * @param string $objectUri
-	 * @param string $calendarData
-	 * @param int $calendarType
-	 * @return string
-	 */
-	public function updateCalendarObject($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		$extraData = $this->getDenormalizedData($calendarData);
-		$query = $this->db->getQueryBuilder();
-		$query->update('calendarobjects')
-				->set('calendardata', $query->createNamedParameter($calendarData, IQueryBuilder::PARAM_LOB))
-				->set('lastmodified', $query->createNamedParameter(time()))
-				->set('etag', $query->createNamedParameter($extraData['etag']))
-				->set('size', $query->createNamedParameter($extraData['size']))
-				->set('componenttype', $query->createNamedParameter($extraData['componentType']))
-				->set('firstoccurence', $query->createNamedParameter($extraData['firstOccurence']))
-				->set('lastoccurence', $query->createNamedParameter($extraData['lastOccurence']))
-				->set('classification', $query->createNamedParameter($extraData['classification']))
-				->set('uid', $query->createNamedParameter($extraData['uid']))
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
-			->executeStatement();
-
-		$this->updateProperties($calendarId, $objectUri, $calendarData, $calendarType);
-		$this->addChange($calendarId, $objectUri, 2, $calendarType);
-
-		$objectRow = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
-		if (is_array($objectRow)) {
-			if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
-				$calendarRow = $this->getCalendarById($calendarId);
-				$shares = $this->getShares($calendarId);
-
-				$this->dispatcher->dispatchTyped(new CalendarObjectUpdatedEvent($calendarId, $calendarRow, $shares, $objectRow));
-			} else {
-				$subscriptionRow = $this->getSubscriptionById($calendarId);
-
-				$this->dispatcher->dispatchTyped(new CachedCalendarObjectUpdatedEvent($calendarId, $subscriptionRow, [], $objectRow));
-			}
-		}
-
-		return '"' . $extraData['etag'] . '"';
-	}
-
-	/**
-	 * Moves a calendar object from calendar to calendar.
-	 *
-	 * @param int $sourceCalendarId
-	 * @param int $targetCalendarId
-	 * @param int $objectId
-	 * @param string $oldPrincipalUri
-	 * @param string $newPrincipalUri
-	 * @param int $calendarType
-	 * @return bool
-	 * @throws Exception
-	 */
-	public function moveCalendarObject(int $sourceCalendarId, int $targetCalendarId, int $objectId, string $oldPrincipalUri, string $newPrincipalUri, int $calendarType = self::CALENDAR_TYPE_CALENDAR): bool {
-		$object = $this->getCalendarObjectById($oldPrincipalUri, $objectId);
-		if (empty($object)) {
-			return false;
-		}
-
-		$query = $this->db->getQueryBuilder();
-		$query->update('calendarobjects')
-			->set('calendarid', $query->createNamedParameter($targetCalendarId, IQueryBuilder::PARAM_INT))
-			->where($query->expr()->eq('id', $query->createNamedParameter($objectId, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT))
-			->executeStatement();
-
-		$this->purgeProperties($sourceCalendarId, $objectId);
-		$this->updateProperties($targetCalendarId, $object['uri'], $object['calendardata'], $calendarType);
-
-		$this->addChange($sourceCalendarId, $object['uri'], 1, $calendarType);
-		$this->addChange($targetCalendarId, $object['uri'], 3, $calendarType);
-
-		$object = $this->getCalendarObjectById($newPrincipalUri, $objectId);
-		// Calendar Object wasn't found - possibly because it was deleted in the meantime by a different client
-		if (empty($object)) {
-			return false;
-		}
-
-		$targetCalendarRow = $this->getCalendarById($targetCalendarId);
-		// the calendar this event is being moved to does not exist any longer
-		if (empty($targetCalendarRow)) {
-			return false;
-		}
-
-		if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
-			$sourceShares = $this->getShares($sourceCalendarId);
-			$targetShares = $this->getShares($targetCalendarId);
-			$sourceCalendarRow = $this->getCalendarById($sourceCalendarId);
-			$this->dispatcher->dispatchTyped(new CalendarObjectMovedEvent($sourceCalendarId, $sourceCalendarRow, $targetCalendarId, $targetCalendarRow, $sourceShares, $targetShares, $object));
-		}
-		return true;
-	}
-
-
-	/**
-	 * @param int $calendarObjectId
-	 * @param int $classification
-	 */
-	public function setClassification($calendarObjectId, $classification) {
-		if (!in_array($classification, [
-			self::CLASSIFICATION_PUBLIC, self::CLASSIFICATION_PRIVATE, self::CLASSIFICATION_CONFIDENTIAL
-		])) {
-			throw new \InvalidArgumentException();
-		}
-		$query = $this->db->getQueryBuilder();
-		$query->update('calendarobjects')
-			->set('classification', $query->createNamedParameter($classification))
-			->where($query->expr()->eq('id', $query->createNamedParameter($calendarObjectId)))
-			->executeStatement();
-	}
-
-	/**
-	 * Deletes an existing calendar object.
-	 *
-	 * The object uri is only the basename, or filename and not a full path.
-	 *
-	 * @param mixed $calendarId
-	 * @param string $objectUri
-	 * @param int $calendarType
-	 * @param bool $forceDeletePermanently
-	 * @return void
-	 */
-	public function deleteCalendarObject($calendarId, $objectUri, $calendarType = self::CALENDAR_TYPE_CALENDAR, bool $forceDeletePermanently = false) {
-		$data = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
-
-		if ($data === null) {
-			// Nothing to delete
-			return;
-		}
-
-		if ($forceDeletePermanently || $this->config->getAppValue(Application::APP_ID, RetentionService::RETENTION_CONFIG_KEY) === '0') {
-			$stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendarobjects` WHERE `calendarid` = ? AND `uri` = ? AND `calendartype` = ?');
-			$stmt->execute([$calendarId, $objectUri, $calendarType]);
-
-			$this->purgeProperties($calendarId, $data['id']);
-
-			if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
-				$calendarRow = $this->getCalendarById($calendarId);
-				$shares = $this->getShares($calendarId);
-
-				$this->dispatcher->dispatchTyped(new CalendarObjectDeletedEvent($calendarId, $calendarRow, $shares, $data));
-			} else {
-				$subscriptionRow = $this->getSubscriptionById($calendarId);
-
-				$this->dispatcher->dispatchTyped(new CachedCalendarObjectDeletedEvent($calendarId, $subscriptionRow, [], $data));
-			}
-		} else {
-			$pathInfo = pathinfo($data['uri']);
-			if (!empty($pathInfo['extension'])) {
-				// Append a suffix to "free" the old URI for recreation
-				$newUri = sprintf(
-					"%s-deleted.%s",
-					$pathInfo['filename'],
-					$pathInfo['extension']
-				);
-			} else {
-				$newUri = sprintf(
-					"%s-deleted",
-					$pathInfo['filename']
-				);
-			}
-
-			// Try to detect conflicts before the DB does
-			// As unlikely as it seems, this can happen when the user imports, then deletes, imports and deletes again
-			$newObject = $this->getCalendarObject($calendarId, $newUri, $calendarType);
-			if ($newObject !== null) {
-				throw new Forbidden("A calendar object with URI $newUri already exists in calendar $calendarId, therefore this object can't be moved into the trashbin");
-			}
-
-			$qb = $this->db->getQueryBuilder();
-			$markObjectDeletedQuery = $qb->update('calendarobjects')
-				->set('deleted_at', $qb->createNamedParameter(time(), IQueryBuilder::PARAM_INT))
-				->set('uri', $qb->createNamedParameter($newUri))
-				->where(
-					$qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
-					$qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT),
-					$qb->expr()->eq('uri', $qb->createNamedParameter($objectUri))
-				);
-			$markObjectDeletedQuery->executeStatement();
-
-			$calendarData = $this->getCalendarById($calendarId);
-			if ($calendarData !== null) {
-				$this->dispatcher->dispatchTyped(
-					new CalendarObjectMovedToTrashEvent(
-						$calendarId,
-						$calendarData,
-						$this->getShares($calendarId),
-						$data
-					)
-				);
-			}
-		}
-
-		$this->addChange($calendarId, $objectUri, 3, $calendarType);
-	}
-
-	/**
-	 * @param mixed $objectData
-	 *
-	 * @throws Forbidden
-	 */
-	public function restoreCalendarObject(array $objectData): void {
-		$id = (int) $objectData['id'];
-		$restoreUri = str_replace("-deleted.ics", ".ics", $objectData['uri']);
-		$targetObject = $this->getCalendarObject(
-			$objectData['calendarid'],
-			$restoreUri
-		);
-		if ($targetObject !== null) {
-			throw new Forbidden("Can not restore calendar $id because a calendar object with the URI $restoreUri already exists");
-		}
-
-		$qb = $this->db->getQueryBuilder();
-		$update = $qb->update('calendarobjects')
-			->set('uri', $qb->createNamedParameter($restoreUri))
-			->set('deleted_at', $qb->createNamedParameter(null))
-			->where($qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
-		$update->executeStatement();
-
-		// Make sure this change is tracked in the changes table
-		$qb2 = $this->db->getQueryBuilder();
-		$selectObject = $qb2->select('calendardata', 'uri', 'calendarid', 'calendartype')
-			->selectAlias('componenttype', 'component')
-			->from('calendarobjects')
-			->where($qb2->expr()->eq('id', $qb2->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
-		$result = $selectObject->executeQuery();
-		$row = $result->fetch();
-		$result->closeCursor();
-		if ($row === false) {
-			// Welp, this should possibly not have happened, but let's ignore
-			return;
-		}
-		$this->addChange($row['calendarid'], $row['uri'], 1, (int) $row['calendartype']);
-
-		$calendarRow = $this->getCalendarById((int) $row['calendarid']);
-		if ($calendarRow === null) {
-			throw new RuntimeException('Calendar object data that was just written can\'t be read back. Check your database configuration.');
-		}
-		$this->dispatcher->dispatchTyped(
-			new CalendarObjectRestoredEvent(
-				(int) $objectData['calendarid'],
-				$calendarRow,
-				$this->getShares((int) $row['calendarid']),
-				$row
-			)
-		);
-	}
-
-	/**
-	 * Performs a calendar-query on the contents of this calendar.
-	 *
-	 * The calendar-query is defined in RFC4791 : CalDAV. Using the
-	 * calendar-query it is possible for a client to request a specific set of
-	 * object, based on contents of iCalendar properties, date-ranges and
-	 * iCalendar component types (VTODO, VEVENT).
-	 *
-	 * This method should just return a list of (relative) urls that match this
-	 * query.
-	 *
-	 * The list of filters are specified as an array. The exact array is
-	 * documented by Sabre\CalDAV\CalendarQueryParser.
-	 *
-	 * Note that it is extremely likely that getCalendarObject for every path
-	 * returned from this method will be called almost immediately after. You
-	 * may want to anticipate this to speed up these requests.
-	 *
-	 * This method provides a default implementation, which parses *all* the
-	 * iCalendar objects in the specified calendar.
-	 *
-	 * This default may well be good enough for personal use, and calendars
-	 * that aren't very large. But if you anticipate high usage, big calendars
-	 * or high loads, you are strongly advised to optimize certain paths.
-	 *
-	 * The best way to do so is override this method and to optimize
-	 * specifically for 'common filters'.
-	 *
-	 * Requests that are extremely common are:
-	 *   * requests for just VEVENTS
-	 *   * requests for just VTODO
-	 *   * requests with a time-range-filter on either VEVENT or VTODO.
-	 *
-	 * ..and combinations of these requests. It may not be worth it to try to
-	 * handle every possible situation and just rely on the (relatively
-	 * easy to use) CalendarQueryValidator to handle the rest.
-	 *
-	 * Note that especially time-range-filters may be difficult to parse. A
-	 * time-range filter specified on a VEVENT must for instance also handle
-	 * recurrence rules correctly.
-	 * A good example of how to interpret all these filters can also simply
-	 * be found in Sabre\CalDAV\CalendarQueryFilter. This class is as correct
-	 * as possible, so it gives you a good idea on what type of stuff you need
-	 * to think of.
-	 *
-	 * @param mixed $calendarId
-	 * @param array $filters
-	 * @param int $calendarType
-	 * @return array
-	 */
-	public function calendarQuery($calendarId, array $filters, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
-		$componentType = null;
-		$requirePostFilter = true;
-		$timeRange = null;
-
-		// if no filters were specified, we don't need to filter after a query
-		if (!$filters['prop-filters'] && !$filters['comp-filters']) {
-			$requirePostFilter = false;
-		}
-
-		// Figuring out if there's a component filter
-		if (count($filters['comp-filters']) > 0 && !$filters['comp-filters'][0]['is-not-defined']) {
-			$componentType = $filters['comp-filters'][0]['name'];
-
-			// Checking if we need post-filters
-			if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['time-range'] && !$filters['comp-filters'][0]['prop-filters']) {
-				$requirePostFilter = false;
-			}
-			// There was a time-range filter
-			if ($componentType === 'VEVENT' && isset($filters['comp-filters'][0]['time-range']) && is_array($filters['comp-filters'][0]['time-range'])) {
-				$timeRange = $filters['comp-filters'][0]['time-range'];
-
-				// If start time OR the end time is not specified, we can do a
-				// 100% accurate mysql query.
-				if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
-					$requirePostFilter = false;
-				}
-			}
-		}
-		$columns = ['uri'];
-		if ($requirePostFilter) {
-			$columns = ['uri', 'calendardata'];
-		}
-		$query = $this->db->getQueryBuilder();
-		$query->select($columns)
-			->from('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
-			->andWhere($query->expr()->isNull('deleted_at'));
-
-		if ($componentType) {
-			$query->andWhere($query->expr()->eq('componenttype', $query->createNamedParameter($componentType)));
-		}
-
-		if ($timeRange && $timeRange['start']) {
-			$query->andWhere($query->expr()->gt('lastoccurence', $query->createNamedParameter($timeRange['start']->getTimeStamp())));
-		}
-		if ($timeRange && $timeRange['end']) {
-			$query->andWhere($query->expr()->lt('firstoccurence', $query->createNamedParameter($timeRange['end']->getTimeStamp())));
-		}
-
-		$stmt = $query->executeQuery();
-
-		$result = [];
-		while ($row = $stmt->fetch()) {
-			if ($requirePostFilter) {
-				// validateFilterForObject will parse the calendar data
-				// catch parsing errors
-				try {
-					$matches = $this->validateFilterForObject($row, $filters);
-				} catch (ParseException $ex) {
-					$this->logger->error('Caught parsing exception for calendar data. This usually indicates invalid calendar data. calendar-id:'.$calendarId.' uri:'.$row['uri'], [
-						'app' => 'dav',
-						'exception' => $ex,
-					]);
-					continue;
-				} catch (InvalidDataException $ex) {
-					$this->logger->error('Caught invalid data exception for calendar data. This usually indicates invalid calendar data. calendar-id:'.$calendarId.' uri:'.$row['uri'], [
-						'app' => 'dav',
-						'exception' => $ex,
-					]);
-					continue;
-				}
-
-				if (!$matches) {
-					continue;
-				}
-			}
-			$result[] = $row['uri'];
-		}
-
-		return $result;
-	}
-
-	/**
-	 * custom Nextcloud search extension for CalDAV
-	 *
-	 * TODO - this should optionally cover cached calendar objects as well
-	 *
-	 * @param string $principalUri
-	 * @param array $filters
-	 * @param integer|null $limit
-	 * @param integer|null $offset
-	 * @return array
-	 */
-	public function calendarSearch($principalUri, array $filters, $limit = null, $offset = null) {
-		$calendars = $this->getCalendarsForUser($principalUri);
-		$ownCalendars = [];
-		$sharedCalendars = [];
-
-		$uriMapper = [];
-
-		foreach ($calendars as $calendar) {
-			if ($calendar['{http://owncloud.org/ns}owner-principal'] === $principalUri) {
-				$ownCalendars[] = $calendar['id'];
-			} else {
-				$sharedCalendars[] = $calendar['id'];
-			}
-			$uriMapper[$calendar['id']] = $calendar['uri'];
-		}
-		if (count($ownCalendars) === 0 && count($sharedCalendars) === 0) {
-			return [];
-		}
-
-		$query = $this->db->getQueryBuilder();
-		// Calendar id expressions
-		$calendarExpressions = [];
-		foreach ($ownCalendars as $id) {
-			$calendarExpressions[] = $query->expr()->andX(
-				$query->expr()->eq('c.calendarid',
-					$query->createNamedParameter($id)),
-				$query->expr()->eq('c.calendartype',
-						$query->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
-		}
-		foreach ($sharedCalendars as $id) {
-			$calendarExpressions[] = $query->expr()->andX(
-				$query->expr()->eq('c.calendarid',
-					$query->createNamedParameter($id)),
-				$query->expr()->eq('c.classification',
-					$query->createNamedParameter(self::CLASSIFICATION_PUBLIC)),
-				$query->expr()->eq('c.calendartype',
-					$query->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
-		}
-
-		if (count($calendarExpressions) === 1) {
-			$calExpr = $calendarExpressions[0];
-		} else {
-			$calExpr = call_user_func_array([$query->expr(), 'orX'], $calendarExpressions);
-		}
-
-		// Component expressions
-		$compExpressions = [];
-		foreach ($filters['comps'] as $comp) {
-			$compExpressions[] = $query->expr()
-				->eq('c.componenttype', $query->createNamedParameter($comp));
-		}
-
-		if (count($compExpressions) === 1) {
-			$compExpr = $compExpressions[0];
-		} else {
-			$compExpr = call_user_func_array([$query->expr(), 'orX'], $compExpressions);
-		}
-
-		if (!isset($filters['props'])) {
-			$filters['props'] = [];
-		}
-		if (!isset($filters['params'])) {
-			$filters['params'] = [];
-		}
-
-		$propParamExpressions = [];
-		foreach ($filters['props'] as $prop) {
-			$propParamExpressions[] = $query->expr()->andX(
-				$query->expr()->eq('i.name', $query->createNamedParameter($prop)),
-				$query->expr()->isNull('i.parameter')
-			);
-		}
-		foreach ($filters['params'] as $param) {
-			$propParamExpressions[] = $query->expr()->andX(
-				$query->expr()->eq('i.name', $query->createNamedParameter($param['property'])),
-				$query->expr()->eq('i.parameter', $query->createNamedParameter($param['parameter']))
-			);
-		}
-
-		if (count($propParamExpressions) === 1) {
-			$propParamExpr = $propParamExpressions[0];
-		} else {
-			$propParamExpr = call_user_func_array([$query->expr(), 'orX'], $propParamExpressions);
-		}
-
-		$query->select(['c.calendarid', 'c.uri'])
-			->from($this->dbObjectPropertiesTable, 'i')
-			->join('i', 'calendarobjects', 'c', $query->expr()->eq('i.objectid', 'c.id'))
-			->where($calExpr)
-			->andWhere($compExpr)
-			->andWhere($propParamExpr)
-			->andWhere($query->expr()->iLike('i.value',
-				$query->createNamedParameter('%'.$this->db->escapeLikeParameter($filters['search-term']).'%')))
-			->andWhere($query->expr()->isNull('deleted_at'));
-
-		if ($offset) {
-			$query->setFirstResult($offset);
-		}
-		if ($limit) {
-			$query->setMaxResults($limit);
-		}
-
-		$stmt = $query->executeQuery();
-
-		$result = [];
-		while ($row = $stmt->fetch()) {
-			$path = $uriMapper[$row['calendarid']] . '/' . $row['uri'];
-			if (!in_array($path, $result)) {
-				$result[] = $path;
-			}
-		}
-
-		return $result;
-	}
-
-	/**
-	 * used for Nextcloud's calendar API
-	 *
-	 * @param array $calendarInfo
-	 * @param string $pattern
-	 * @param array $searchProperties
-	 * @param array $options
-	 * @param integer|null $limit
-	 * @param integer|null $offset
-	 *
-	 * @return array
-	 */
-	public function search(array $calendarInfo, $pattern, array $searchProperties,
-						   array $options, $limit, $offset) {
-		$outerQuery = $this->db->getQueryBuilder();
-		$innerQuery = $this->db->getQueryBuilder();
-
-		$innerQuery->selectDistinct('op.objectid')
-			->from($this->dbObjectPropertiesTable, 'op')
-			->andWhere($innerQuery->expr()->eq('op.calendarid',
-				$outerQuery->createNamedParameter($calendarInfo['id'])))
-			->andWhere($innerQuery->expr()->eq('op.calendartype',
-				$outerQuery->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
-
-		// only return public items for shared calendars for now
-		if (isset($calendarInfo['{http://owncloud.org/ns}owner-principal']) === false || $calendarInfo['principaluri'] !== $calendarInfo['{http://owncloud.org/ns}owner-principal']) {
-			$innerQuery->andWhere($innerQuery->expr()->eq('c.classification',
-				$outerQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
-		}
-
-		if (!empty($searchProperties)) {
-			$or = $innerQuery->expr()->orX();
-			foreach ($searchProperties as $searchProperty) {
-				$or->add($innerQuery->expr()->eq('op.name',
-					$outerQuery->createNamedParameter($searchProperty)));
-			}
-			$innerQuery->andWhere($or);
-		}
-
-		if ($pattern !== '') {
-			$innerQuery->andWhere($innerQuery->expr()->iLike('op.value',
-				$outerQuery->createNamedParameter('%' .
-					$this->db->escapeLikeParameter($pattern) . '%')));
-		}
-
-		$outerQuery->select('c.id', 'c.calendardata', 'c.componenttype', 'c.uid', 'c.uri')
-			->from('calendarobjects', 'c')
-			->where($outerQuery->expr()->isNull('deleted_at'));
-
-		if (isset($options['timerange'])) {
-			if (isset($options['timerange']['start']) && $options['timerange']['start'] instanceof DateTimeInterface) {
-				$outerQuery->andWhere($outerQuery->expr()->gt('lastoccurence',
-					$outerQuery->createNamedParameter($options['timerange']['start']->getTimeStamp())));
-			}
-			if (isset($options['timerange']['end']) && $options['timerange']['end'] instanceof DateTimeInterface) {
-				$outerQuery->andWhere($outerQuery->expr()->lt('firstoccurence',
-					$outerQuery->createNamedParameter($options['timerange']['end']->getTimeStamp())));
-			}
-		}
-
-		if(isset($options['uid'])) {
-			$outerQuery->andWhere($outerQuery->expr()->eq('uid', $outerQuery->createNamedParameter($options['uid'])));
-		}
-
-		if (!empty($options['types'])) {
-			$or = $outerQuery->expr()->orX();
-			foreach ($options['types'] as $type) {
-				$or->add($outerQuery->expr()->eq('componenttype',
-					$outerQuery->createNamedParameter($type)));
-			}
-			$outerQuery->andWhere($or);
-		}
-
-		$outerQuery->andWhere($outerQuery->expr()->in('c.id', $outerQuery->createFunction($innerQuery->getSQL())));
-
-		if ($offset) {
-			$outerQuery->setFirstResult($offset);
-		}
-		if ($limit) {
-			$outerQuery->setMaxResults($limit);
-		}
-
-		$result = $outerQuery->executeQuery();
-		$calendarObjects = array_filter($result->fetchAll(), function (array $row) use ($options) {
-			$start = $options['timerange']['start'] ?? null;
-			$end = $options['timerange']['end'] ?? null;
-
-			if ($start === null || !($start instanceof DateTimeInterface) || $end === null || !($end instanceof DateTimeInterface)) {
-				// No filter required
-				return true;
-			}
-
-			$isValid = $this->validateFilterForObject($row, [
-				'name' => 'VCALENDAR',
-				'comp-filters' => [
-					[
-						'name' => 'VEVENT',
-						'comp-filters' => [],
-						'prop-filters' => [],
-						'is-not-defined' => false,
-						'time-range' => [
-							'start' => $start,
-							'end' => $end,
-						],
-					],
-				],
-				'prop-filters' => [],
-				'is-not-defined' => false,
-				'time-range' => null,
-			]);
-			if (is_resource($row['calendardata'])) {
-				// Put the stream back to the beginning so it can be read another time
-				rewind($row['calendardata']);
-			}
-			return $isValid;
-		});
-		$result->closeCursor();
-
-		return array_map(function ($o) {
-			$calendarData = Reader::read($o['calendardata']);
-			$comps = $calendarData->getComponents();
-			$objects = [];
-			$timezones = [];
-			foreach ($comps as $comp) {
-				if ($comp instanceof VTimeZone) {
-					$timezones[] = $comp;
-				} else {
-					$objects[] = $comp;
-				}
-			}
-
-			return [
-				'id' => $o['id'],
-				'type' => $o['componenttype'],
-				'uid' => $o['uid'],
-				'uri' => $o['uri'],
-				'objects' => array_map(function ($c) {
-					return $this->transformSearchData($c);
-				}, $objects),
-				'timezones' => array_map(function ($c) {
-					return $this->transformSearchData($c);
-				}, $timezones),
-			];
-		}, $calendarObjects);
-	}
-
-	/**
-	 * @param Component $comp
-	 * @return array
-	 */
-	private function transformSearchData(Component $comp) {
-		$data = [];
-		/** @var Component[] $subComponents */
-		$subComponents = $comp->getComponents();
-		/** @var Property[] $properties */
-		$properties = array_filter($comp->children(), function ($c) {
-			return $c instanceof Property;
-		});
-		$validationRules = $comp->getValidationRules();
-
-		foreach ($subComponents as $subComponent) {
-			$name = $subComponent->name;
-			if (!isset($data[$name])) {
-				$data[$name] = [];
-			}
-			$data[$name][] = $this->transformSearchData($subComponent);
-		}
-
-		foreach ($properties as $property) {
-			$name = $property->name;
-			if (!isset($validationRules[$name])) {
-				$validationRules[$name] = '*';
-			}
-
-			$rule = $validationRules[$property->name];
-			if ($rule === '+' || $rule === '*') { // multiple
-				if (!isset($data[$name])) {
-					$data[$name] = [];
-				}
-
-				$data[$name][] = $this->transformSearchProperty($property);
-			} else { // once
-				$data[$name] = $this->transformSearchProperty($property);
-			}
-		}
-
-		return $data;
-	}
-
-	/**
-	 * @param Property $prop
-	 * @return array
-	 */
-	private function transformSearchProperty(Property $prop) {
-		// No need to check Date, as it extends DateTime
-		if ($prop instanceof Property\ICalendar\DateTime) {
-			$value = $prop->getDateTime();
-		} else {
-			$value = $prop->getValue();
-		}
-
-		return [
-			$value,
-			$prop->parameters()
-		];
-	}
-
-	/**
-	 * @param string $principalUri
-	 * @param string $pattern
-	 * @param array $componentTypes
-	 * @param array $searchProperties
-	 * @param array $searchParameters
-	 * @param array $options
-	 * @return array
-	 */
-	public function searchPrincipalUri(string $principalUri,
-									   string $pattern,
-									   array $componentTypes,
-									   array $searchProperties,
-									   array $searchParameters,
-									   array $options = []): array {
-		$escapePattern = !\array_key_exists('escape_like_param', $options) || $options['escape_like_param'] !== false;
-
-		$calendarObjectIdQuery = $this->db->getQueryBuilder();
-		$calendarOr = $calendarObjectIdQuery->expr()->orX();
-		$searchOr = $calendarObjectIdQuery->expr()->orX();
-
-		// Fetch calendars and subscription
-		$calendars = $this->getCalendarsForUser($principalUri);
-		$subscriptions = $this->getSubscriptionsForUser($principalUri);
-		foreach ($calendars as $calendar) {
-			$calendarAnd = $calendarObjectIdQuery->expr()->andX();
-			$calendarAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendarid', $calendarObjectIdQuery->createNamedParameter((int)$calendar['id'])));
-			$calendarAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendartype', $calendarObjectIdQuery->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
-
-			// If it's shared, limit search to public events
-			if (isset($calendar['{http://owncloud.org/ns}owner-principal'])
-				&& $calendar['principaluri'] !== $calendar['{http://owncloud.org/ns}owner-principal']) {
-				$calendarAnd->add($calendarObjectIdQuery->expr()->eq('co.classification', $calendarObjectIdQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
-			}
-
-			$calendarOr->add($calendarAnd);
-		}
-		foreach ($subscriptions as $subscription) {
-			$subscriptionAnd = $calendarObjectIdQuery->expr()->andX();
-			$subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendarid', $calendarObjectIdQuery->createNamedParameter((int)$subscription['id'])));
-			$subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendartype', $calendarObjectIdQuery->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)));
-
-			// If it's shared, limit search to public events
-			if (isset($subscription['{http://owncloud.org/ns}owner-principal'])
-				&& $subscription['principaluri'] !== $subscription['{http://owncloud.org/ns}owner-principal']) {
-				$subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('co.classification', $calendarObjectIdQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
-			}
-
-			$calendarOr->add($subscriptionAnd);
-		}
-
-		foreach ($searchProperties as $property) {
-			$propertyAnd = $calendarObjectIdQuery->expr()->andX();
-			$propertyAnd->add($calendarObjectIdQuery->expr()->eq('cob.name', $calendarObjectIdQuery->createNamedParameter($property, IQueryBuilder::PARAM_STR)));
-			$propertyAnd->add($calendarObjectIdQuery->expr()->isNull('cob.parameter'));
-
-			$searchOr->add($propertyAnd);
-		}
-		foreach ($searchParameters as $property => $parameter) {
-			$parameterAnd = $calendarObjectIdQuery->expr()->andX();
-			$parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.name', $calendarObjectIdQuery->createNamedParameter($property, IQueryBuilder::PARAM_STR)));
-			$parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.parameter', $calendarObjectIdQuery->createNamedParameter($parameter, IQueryBuilder::PARAM_STR_ARRAY)));
-
-			$searchOr->add($parameterAnd);
-		}
-
-		if ($calendarOr->count() === 0) {
-			return [];
-		}
-		if ($searchOr->count() === 0) {
-			return [];
-		}
-
-		$calendarObjectIdQuery->selectDistinct('cob.objectid')
-			->from($this->dbObjectPropertiesTable, 'cob')
-			->leftJoin('cob', 'calendarobjects', 'co', $calendarObjectIdQuery->expr()->eq('co.id', 'cob.objectid'))
-			->andWhere($calendarObjectIdQuery->expr()->in('co.componenttype', $calendarObjectIdQuery->createNamedParameter($componentTypes, IQueryBuilder::PARAM_STR_ARRAY)))
-			->andWhere($calendarOr)
-			->andWhere($searchOr)
-			->andWhere($calendarObjectIdQuery->expr()->isNull('deleted_at'));
-
-		if ('' !== $pattern) {
-			if (!$escapePattern) {
-				$calendarObjectIdQuery->andWhere($calendarObjectIdQuery->expr()->ilike('cob.value', $calendarObjectIdQuery->createNamedParameter($pattern)));
-			} else {
-				$calendarObjectIdQuery->andWhere($calendarObjectIdQuery->expr()->ilike('cob.value', $calendarObjectIdQuery->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
-			}
-		}
-
-		if (isset($options['limit'])) {
-			$calendarObjectIdQuery->setMaxResults($options['limit']);
-		}
-		if (isset($options['offset'])) {
-			$calendarObjectIdQuery->setFirstResult($options['offset']);
-		}
-
-		$result = $calendarObjectIdQuery->executeQuery();
-		$matches = $result->fetchAll();
-		$result->closeCursor();
-		$matches = array_map(static function (array $match):int {
-			return (int) $match['objectid'];
-		}, $matches);
-
-		$query = $this->db->getQueryBuilder();
-		$query->select('calendardata', 'uri', 'calendarid', 'calendartype')
-			->from('calendarobjects')
-			->where($query->expr()->in('id', $query->createNamedParameter($matches, IQueryBuilder::PARAM_INT_ARRAY)));
-
-		$result = $query->executeQuery();
-		$calendarObjects = $result->fetchAll();
-		$result->closeCursor();
-
-		return array_map(function (array $array): array {
-			$array['calendarid'] = (int)$array['calendarid'];
-			$array['calendartype'] = (int)$array['calendartype'];
-			$array['calendardata'] = $this->readBlob($array['calendardata']);
-
-			return $array;
-		}, $calendarObjects);
-	}
-
-	/**
-	 * Searches through all of a users calendars and calendar objects to find
-	 * an object with a specific UID.
-	 *
-	 * This method should return the path to this object, relative to the
-	 * calendar home, so this path usually only contains two parts:
-	 *
-	 * calendarpath/objectpath.ics
-	 *
-	 * If the uid is not found, return null.
-	 *
-	 * This method should only consider * objects that the principal owns, so
-	 * any calendars owned by other principals that also appear in this
-	 * collection should be ignored.
-	 *
-	 * @param string $principalUri
-	 * @param string $uid
-	 * @return string|null
-	 */
-	public function getCalendarObjectByUID($principalUri, $uid) {
-		$query = $this->db->getQueryBuilder();
-		$query->selectAlias('c.uri', 'calendaruri')->selectAlias('co.uri', 'objecturi')
-			->from('calendarobjects', 'co')
-			->leftJoin('co', 'calendars', 'c', $query->expr()->eq('co.calendarid', 'c.id'))
-			->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
-			->andWhere($query->expr()->eq('co.uid', $query->createNamedParameter($uid)))
-			->andWhere($query->expr()->isNull('co.deleted_at'));
-		$stmt = $query->executeQuery();
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-		if ($row) {
-			return $row['calendaruri'] . '/' . $row['objecturi'];
-		}
-
-		return null;
-	}
-
-	public function getCalendarObjectById(string $principalUri, int $id): ?array {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.size', 'co.calendardata', 'co.componenttype', 'co.classification', 'co.deleted_at'])
-			->selectAlias('c.uri', 'calendaruri')
-			->from('calendarobjects', 'co')
-			->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
-			->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
-			->andWhere($query->expr()->eq('co.id', $query->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
-		$stmt = $query->executeQuery();
-		$row = $stmt->fetch();
-		$stmt->closeCursor();
-
-		if (!$row) {
-			return null;
-		}
-
-		return [
-			'id' => $row['id'],
-			'uri' => $row['uri'],
-			'lastmodified' => $row['lastmodified'],
-			'etag' => '"' . $row['etag'] . '"',
-			'calendarid' => $row['calendarid'],
-			'calendaruri' => $row['calendaruri'],
-			'size' => (int)$row['size'],
-			'calendardata' => $this->readBlob($row['calendardata']),
-			'component' => strtolower($row['componenttype']),
-			'classification' => (int)$row['classification'],
-			'deleted_at' => isset($row['deleted_at']) ? ((int) $row['deleted_at']) : null,
-		];
-	}
-
-	/**
-	 * The getChanges method returns all the changes that have happened, since
-	 * the specified syncToken in the specified calendar.
-	 *
-	 * This function should return an array, such as the following:
-	 *
-	 * [
-	 *   'syncToken' => 'The current synctoken',
-	 *   'added'   => [
-	 *      'new.txt',
-	 *   ],
-	 *   'modified'   => [
-	 *      'modified.txt',
-	 *   ],
-	 *   'deleted' => [
-	 *      'foo.php.bak',
-	 *      'old.txt'
-	 *   ]
-	 * );
-	 *
-	 * The returned syncToken property should reflect the *current* syncToken
-	 * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
-	 * property This is * needed here too, to ensure the operation is atomic.
-	 *
-	 * If the $syncToken argument is specified as null, this is an initial
-	 * sync, and all members should be reported.
-	 *
-	 * The modified property is an array of nodenames that have changed since
-	 * the last token.
-	 *
-	 * The deleted property is an array with nodenames, that have been deleted
-	 * from collection.
-	 *
-	 * The $syncLevel argument is basically the 'depth' of the report. If it's
-	 * 1, you only have to report changes that happened only directly in
-	 * immediate descendants. If it's 2, it should also include changes from
-	 * the nodes below the child collections. (grandchildren)
-	 *
-	 * The $limit argument allows a client to specify how many results should
-	 * be returned at most. If the limit is not specified, it should be treated
-	 * as infinite.
-	 *
-	 * If the limit (infinite or not) is higher than you're willing to return,
-	 * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
-	 *
-	 * If the syncToken is expired (due to data cleanup) or unknown, you must
-	 * return null.
-	 *
-	 * The limit is 'suggestive'. You are free to ignore it.
-	 *
-	 * @param string $calendarId
-	 * @param string $syncToken
-	 * @param int $syncLevel
-	 * @param int|null $limit
-	 * @param int $calendarType
-	 * @return array
-	 */
-	public function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		// Current synctoken
-		$qb = $this->db->getQueryBuilder();
-		$qb->select('synctoken')
-			->from('calendars')
-			->where(
-				$qb->expr()->eq('id', $qb->createNamedParameter($calendarId))
-			);
-		$stmt = $qb->executeQuery();
-		$currentToken = $stmt->fetchOne();
-
-		if ($currentToken === false) {
-			return null;
-		}
-
-		$result = [
-			'syncToken' => $currentToken,
-			'added' => [],
-			'modified' => [],
-			'deleted' => [],
-		];
-
-		if ($syncToken) {
-			$qb = $this->db->getQueryBuilder();
-
-			$qb->select('uri', 'operation')
-				->from('calendarchanges')
-				->where(
-					$qb->expr()->andX(
-						$qb->expr()->gte('synctoken', $qb->createNamedParameter($syncToken)),
-						$qb->expr()->lt('synctoken', $qb->createNamedParameter($currentToken)),
-						$qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
-						$qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType))
-					)
-				)->orderBy('synctoken');
-			if (is_int($limit) && $limit > 0) {
-				$qb->setMaxResults($limit);
-			}
-
-			// Fetching all changes
-			$stmt = $qb->executeQuery();
-			$changes = [];
-
-			// This loop ensures that any duplicates are overwritten, only the
-			// last change on a node is relevant.
-			while ($row = $stmt->fetch()) {
-				$changes[$row['uri']] = $row['operation'];
-			}
-			$stmt->closeCursor();
-
-			foreach ($changes as $uri => $operation) {
-				switch ($operation) {
-					case 1:
-						$result['added'][] = $uri;
-						break;
-					case 2:
-						$result['modified'][] = $uri;
-						break;
-					case 3:
-						$result['deleted'][] = $uri;
-						break;
-				}
-			}
-		} else {
-			// No synctoken supplied, this is the initial sync.
-			$qb = $this->db->getQueryBuilder();
-			$qb->select('uri')
-				->from('calendarobjects')
-				->where(
-					$qb->expr()->andX(
-						$qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
-						$qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType))
-					)
-				);
-			$stmt = $qb->executeQuery();
-			$result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
-			$stmt->closeCursor();
-		}
-		return $result;
-	}
-
-	/**
-	 * Returns a list of subscriptions for a principal.
-	 *
-	 * Every subscription is an array with the following keys:
-	 *  * id, a unique id that will be used by other functions to modify the
-	 *    subscription. This can be the same as the uri or a database key.
-	 *  * uri. This is just the 'base uri' or 'filename' of the subscription.
-	 *  * principaluri. The owner of the subscription. Almost always the same as
-	 *    principalUri passed to this method.
-	 *
-	 * Furthermore, all the subscription info must be returned too:
-	 *
-	 * 1. {DAV:}displayname
-	 * 2. {http://apple.com/ns/ical/}refreshrate
-	 * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
-	 *    should not be stripped).
-	 * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
-	 *    should not be stripped).
-	 * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
-	 *    attachments should not be stripped).
-	 * 6. {http://calendarserver.org/ns/}source (Must be a
-	 *     Sabre\DAV\Property\Href).
-	 * 7. {http://apple.com/ns/ical/}calendar-color
-	 * 8. {http://apple.com/ns/ical/}calendar-order
-	 * 9. {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
-	 *    (should just be an instance of
-	 *    Sabre\CalDAV\Property\SupportedCalendarComponentSet, with a bunch of
-	 *    default components).
-	 *
-	 * @param string $principalUri
-	 * @return array
-	 */
-	public function getSubscriptionsForUser($principalUri) {
-		$fields = array_column($this->subscriptionPropertyMap, 0);
-		$fields[] = 'id';
-		$fields[] = 'uri';
-		$fields[] = 'source';
-		$fields[] = 'principaluri';
-		$fields[] = 'lastmodified';
-		$fields[] = 'synctoken';
-
-		$query = $this->db->getQueryBuilder();
-		$query->select($fields)
-			->from('calendarsubscriptions')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-			->orderBy('calendarorder', 'asc');
-		$stmt = $query->executeQuery();
-
-		$subscriptions = [];
-		while ($row = $stmt->fetch()) {
-			$subscription = [
-				'id' => $row['id'],
-				'uri' => $row['uri'],
-				'principaluri' => $row['principaluri'],
-				'source' => $row['source'],
-				'lastmodified' => $row['lastmodified'],
-
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-			];
-
-			$subscriptions[] = $this->rowToSubscription($row, $subscription);
-		}
-
-		return $subscriptions;
-	}
-
-	/**
-	 * Creates a new subscription for a principal.
-	 *
-	 * If the creation was a success, an id must be returned that can be used to reference
-	 * this subscription in other methods, such as updateSubscription.
-	 *
-	 * @param string $principalUri
-	 * @param string $uri
-	 * @param array $properties
-	 * @return mixed
-	 */
-	public function createSubscription($principalUri, $uri, array $properties) {
-		if (!isset($properties['{http://calendarserver.org/ns/}source'])) {
-			throw new Forbidden('The {http://calendarserver.org/ns/}source property is required when creating subscriptions');
-		}
-
-		$values = [
-			'principaluri' => $principalUri,
-			'uri' => $uri,
-			'source' => $properties['{http://calendarserver.org/ns/}source']->getHref(),
-			'lastmodified' => time(),
-		];
-
-		$propertiesBoolean = ['striptodos', 'stripalarms', 'stripattachments'];
-
-		foreach ($this->subscriptionPropertyMap as $xmlName => [$dbName, $type]) {
-			if (array_key_exists($xmlName, $properties)) {
-				$values[$dbName] = $properties[$xmlName];
-				if (in_array($dbName, $propertiesBoolean)) {
-					$values[$dbName] = true;
-				}
-			}
-		}
-
-		[$subscriptionId, $subscriptionRow] = $this->atomic(function() use ($values) {
-			$valuesToInsert = [];
-			$query = $this->db->getQueryBuilder();
-			foreach (array_keys($values) as $name) {
-				$valuesToInsert[$name] = $query->createNamedParameter($values[$name]);
-			}
-			$query->insert('calendarsubscriptions')
-				->values($valuesToInsert)
-				->executeStatement();
-
-			$subscriptionId = $query->getLastInsertId();
-
-			$subscriptionRow = $this->getSubscriptionById($subscriptionId);
-			return [$subscriptionId, $subscriptionRow];
-		}, $this->db);
-
-		$this->dispatcher->dispatchTyped(new SubscriptionCreatedEvent($subscriptionId, $subscriptionRow));
-
-		return $subscriptionId;
-	}
-
-	/**
-	 * Updates a subscription
-	 *
-	 * The list of mutations is stored in a Sabre\DAV\PropPatch object.
-	 * To do the actual updates, you must tell this object which properties
-	 * you're going to process with the handle() method.
-	 *
-	 * Calling the handle method is like telling the PropPatch object "I
-	 * promise I can handle updating this property".
-	 *
-	 * Read the PropPatch documentation for more info and examples.
-	 *
-	 * @param mixed $subscriptionId
-	 * @param PropPatch $propPatch
-	 * @return void
-	 */
-	public function updateSubscription($subscriptionId, PropPatch $propPatch) {
-		$supportedProperties = array_keys($this->subscriptionPropertyMap);
-		$supportedProperties[] = '{http://calendarserver.org/ns/}source';
-
-		$propPatch->handle($supportedProperties, function ($mutations) use ($subscriptionId) {
-			$newValues = [];
-
-			foreach ($mutations as $propertyName => $propertyValue) {
-				if ($propertyName === '{http://calendarserver.org/ns/}source') {
-					$newValues['source'] = $propertyValue->getHref();
-				} else {
-					$fieldName = $this->subscriptionPropertyMap[$propertyName][0];
-					$newValues[$fieldName] = $propertyValue;
-				}
-			}
-
-			$query = $this->db->getQueryBuilder();
-			$query->update('calendarsubscriptions')
-				->set('lastmodified', $query->createNamedParameter(time()));
-			foreach ($newValues as $fieldName => $value) {
-				$query->set($fieldName, $query->createNamedParameter($value));
-			}
-			$query->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
-				->executeStatement();
-
-			$subscriptionRow = $this->getSubscriptionById($subscriptionId);
-			$this->dispatcher->dispatchTyped(new SubscriptionUpdatedEvent((int)$subscriptionId, $subscriptionRow, [], $mutations));
-
-			return true;
-		});
-	}
-
-	/**
-	 * Deletes a subscription.
-	 *
-	 * @param mixed $subscriptionId
-	 * @return void
-	 */
-	public function deleteSubscription($subscriptionId) {
-		$subscriptionRow = $this->getSubscriptionById($subscriptionId);
-
-		$query = $this->db->getQueryBuilder();
-		$query->delete('calendarsubscriptions')
-			->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
-			->executeStatement();
-
-		$query = $this->db->getQueryBuilder();
-		$query->delete('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		$query->delete('calendarchanges')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		$query->delete($this->dbObjectPropertiesTable)
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		if ($subscriptionRow) {
-			$this->dispatcher->dispatchTyped(new SubscriptionDeletedEvent((int)$subscriptionId, $subscriptionRow, []));
-		}
-	}
-
-	/**
-	 * Returns a single scheduling object for the inbox collection.
-	 *
-	 * The returned array should contain the following elements:
-	 *   * uri - A unique basename for the object. This will be used to
-	 *           construct a full uri.
-	 *   * calendardata - The iCalendar object
-	 *   * lastmodified - The last modification date. Can be an int for a unix
-	 *                    timestamp, or a PHP DateTime object.
-	 *   * etag - A unique token that must change if the object changed.
-	 *   * size - The size of the object, in bytes.
-	 *
-	 * @param string $principalUri
-	 * @param string $objectUri
-	 * @return array
-	 */
-	public function getSchedulingObject($principalUri, $objectUri) {
-		$query = $this->db->getQueryBuilder();
-		$stmt = $query->select(['uri', 'calendardata', 'lastmodified', 'etag', 'size'])
-			->from('schedulingobjects')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
-			->executeQuery();
-
-		$row = $stmt->fetch();
-
-		if (!$row) {
-			return null;
-		}
-
-		return [
-			'uri' => $row['uri'],
-			'calendardata' => $row['calendardata'],
-			'lastmodified' => $row['lastmodified'],
-			'etag' => '"' . $row['etag'] . '"',
-			'size' => (int)$row['size'],
-		];
-	}
-
-	/**
-	 * Returns all scheduling objects for the inbox collection.
-	 *
-	 * These objects should be returned as an array. Every item in the array
-	 * should follow the same structure as returned from getSchedulingObject.
-	 *
-	 * The main difference is that 'calendardata' is optional.
-	 *
-	 * @param string $principalUri
-	 * @return array
-	 */
-	public function getSchedulingObjects($principalUri) {
-		$query = $this->db->getQueryBuilder();
-		$stmt = $query->select(['uri', 'calendardata', 'lastmodified', 'etag', 'size'])
-				->from('schedulingobjects')
-				->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-				->executeQuery();
-
-		$result = [];
-		foreach ($stmt->fetchAll() as $row) {
-			$result[] = [
-				'calendardata' => $row['calendardata'],
-				'uri' => $row['uri'],
-				'lastmodified' => $row['lastmodified'],
-				'etag' => '"' . $row['etag'] . '"',
-				'size' => (int)$row['size'],
-			];
-		}
-		$stmt->closeCursor();
-
-		return $result;
-	}
-
-	/**
-	 * Deletes a scheduling object from the inbox collection.
-	 *
-	 * @param string $principalUri
-	 * @param string $objectUri
-	 * @return void
-	 */
-	public function deleteSchedulingObject($principalUri, $objectUri) {
-		$query = $this->db->getQueryBuilder();
-		$query->delete('schedulingobjects')
-				->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
-				->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
-				->executeStatement();
-	}
-
-	/**
-	 * Creates a new scheduling object. This should land in a users' inbox.
-	 *
-	 * @param string $principalUri
-	 * @param string $objectUri
-	 * @param string $objectData
-	 * @return void
-	 */
-	public function createSchedulingObject($principalUri, $objectUri, $objectData) {
-		$query = $this->db->getQueryBuilder();
-		$query->insert('schedulingobjects')
-			->values([
-				'principaluri' => $query->createNamedParameter($principalUri),
-				'calendardata' => $query->createNamedParameter($objectData, IQueryBuilder::PARAM_LOB),
-				'uri' => $query->createNamedParameter($objectUri),
-				'lastmodified' => $query->createNamedParameter(time()),
-				'etag' => $query->createNamedParameter(md5($objectData)),
-				'size' => $query->createNamedParameter(strlen($objectData))
-			])
-			->executeStatement();
-	}
-
-	/**
-	 * Adds a change record to the calendarchanges table.
-	 *
-	 * @param mixed $calendarId
-	 * @param string $objectUri
-	 * @param int $operation 1 = add, 2 = modify, 3 = delete.
-	 * @param int $calendarType
-	 * @return void
-	 */
-	protected function addChange($calendarId, $objectUri, $operation, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		$table = $calendarType === self::CALENDAR_TYPE_CALENDAR ? 'calendars': 'calendarsubscriptions';
-
-		$query = $this->db->getQueryBuilder();
-		$query->select('synctoken')
-			->from($table)
-			->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)));
-		$result = $query->executeQuery();
-		$syncToken = (int)$result->fetchOne();
-		$result->closeCursor();
-
-		$query = $this->db->getQueryBuilder();
-		$query->insert('calendarchanges')
-			->values([
-				'uri' => $query->createNamedParameter($objectUri),
-				'synctoken' => $query->createNamedParameter($syncToken),
-				'calendarid' => $query->createNamedParameter($calendarId),
-				'operation' => $query->createNamedParameter($operation),
-				'calendartype' => $query->createNamedParameter($calendarType),
-			])
-			->executeStatement();
-
-		$stmt = $this->db->prepare("UPDATE `*PREFIX*$table` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?");
-		$stmt->execute([
-			$calendarId
-		]);
-	}
-
-	/**
-	 * Parses some information from calendar objects, used for optimized
-	 * calendar-queries.
-	 *
-	 * Returns an array with the following keys:
-	 *   * etag - An md5 checksum of the object without the quotes.
-	 *   * size - Size of the object in bytes
-	 *   * componentType - VEVENT, VTODO or VJOURNAL
-	 *   * firstOccurence
-	 *   * lastOccurence
-	 *   * uid - value of the UID property
-	 *
-	 * @param string $calendarData
-	 * @return array
-	 */
-	public function getDenormalizedData($calendarData) {
-		$vObject = Reader::read($calendarData);
-		$vEvents = [];
-		$componentType = null;
-		$component = null;
-		$firstOccurrence = null;
-		$lastOccurrence = null;
-		$uid = null;
-		$classification = self::CLASSIFICATION_PUBLIC;
-		$hasDTSTART = false;
-		foreach ($vObject->getComponents() as $component) {
-			if ($component->name !== 'VTIMEZONE') {
-				// Finding all VEVENTs, and track them
-				if ($component->name === 'VEVENT') {
-					array_push($vEvents, $component);
-					if ($component->DTSTART) {
-						$hasDTSTART = true;
-					}
-				}
-				// Track first component type and uid
-				if ($uid === null) {
-					$componentType = $component->name;
-					$uid = (string)$component->UID;
-				}
-			}
-		}
-		if (!$componentType) {
-			throw new BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
-		}
-
-		if ($hasDTSTART) {
-			$component = $vEvents[0];
-
-			// Finding the last occurrence is a bit harder
-			if (!isset($component->RRULE) && count($vEvents) === 1) {
-				$firstOccurrence = $component->DTSTART->getDateTime()->getTimeStamp();
-				if (isset($component->DTEND)) {
-					$lastOccurrence = $component->DTEND->getDateTime()->getTimeStamp();
-				} elseif (isset($component->DURATION)) {
-					$endDate = clone $component->DTSTART->getDateTime();
-					$endDate->add(DateTimeParser::parse($component->DURATION->getValue()));
-					$lastOccurrence = $endDate->getTimeStamp();
-				} elseif (!$component->DTSTART->hasTime()) {
-					$endDate = clone $component->DTSTART->getDateTime();
-					$endDate->modify('+1 day');
-					$lastOccurrence = $endDate->getTimeStamp();
-				} else {
-					$lastOccurrence = $firstOccurrence;
-				}
-			} else {
-				$it = new EventIterator($vEvents);
-				$maxDate = new DateTime(self::MAX_DATE);
-				$firstOccurrence = $it->getDtStart()->getTimestamp();
-				if ($it->isInfinite()) {
-					$lastOccurrence = $maxDate->getTimestamp();
-				} else {
-					$end = $it->getDtEnd();
-					while ($it->valid() && $end < $maxDate) {
-						$end = $it->getDtEnd();
-						$it->next();
-					}
-					$lastOccurrence = $end->getTimestamp();
-				}
-			}
-		}
-
-		if ($component->CLASS) {
-			$classification = CalDavBackend::CLASSIFICATION_PRIVATE;
-			switch ($component->CLASS->getValue()) {
-				case 'PUBLIC':
-					$classification = CalDavBackend::CLASSIFICATION_PUBLIC;
-					break;
-				case 'CONFIDENTIAL':
-					$classification = CalDavBackend::CLASSIFICATION_CONFIDENTIAL;
-					break;
-			}
-		}
-		return [
-			'etag' => md5($calendarData),
-			'size' => strlen($calendarData),
-			'componentType' => $componentType,
-			'firstOccurence' => is_null($firstOccurrence) ? null : max(0, $firstOccurrence),
-			'lastOccurence' => $lastOccurrence,
-			'uid' => $uid,
-			'classification' => $classification
-		];
-	}
-
-	/**
-	 * @param $cardData
-	 * @return bool|string
-	 */
-	private function readBlob($cardData) {
-		if (is_resource($cardData)) {
-			return stream_get_contents($cardData);
-		}
-
-		return $cardData;
-	}
-
-	/**
-	 * @param list<array{href: string, commonName: string, readOnly: bool}> $add
-	 * @param list<string> $remove
-	 */
-	public function updateShares(IShareable $shareable, array $add, array $remove): void {
-		$calendarId = $shareable->getResourceId();
-		$calendarRow = $this->getCalendarById($calendarId);
-		if ($calendarRow === null) {
-			throw new \RuntimeException('Trying to update shares for innexistant calendar: ' . $calendarId);
-		}
-		$oldShares = $this->getShares($calendarId);
-
-		$this->calendarSharingBackend->updateShares($shareable, $add, $remove);
-
-		$this->dispatcher->dispatchTyped(new CalendarShareUpdatedEvent($calendarId, $calendarRow, $oldShares, $add, $remove));
-	}
-
-	/**
-	 * @return list<array{href: string, commonName: string, status: int, readOnly: bool, '{http://owncloud.org/ns}principal': string, '{http://owncloud.org/ns}group-share': bool}>
-	 */
-	public function getShares(int $resourceId): array {
-		return $this->calendarSharingBackend->getShares($resourceId);
-	}
-
-	/**
-	 * @param boolean $value
-	 * @param \OCA\DAV\CalDAV\Calendar $calendar
-	 * @return string|null
-	 */
-	public function setPublishStatus($value, $calendar) {
-		$calendarId = $calendar->getResourceId();
-		$calendarData = $this->getCalendarById($calendarId);
-
-		$query = $this->db->getQueryBuilder();
-		if ($value) {
-			$publicUri = $this->random->generate(16, ISecureRandom::CHAR_HUMAN_READABLE);
-			$query->insert('dav_shares')
-				->values([
-					'principaluri' => $query->createNamedParameter($calendar->getPrincipalURI()),
-					'type' => $query->createNamedParameter('calendar'),
-					'access' => $query->createNamedParameter(self::ACCESS_PUBLIC),
-					'resourceid' => $query->createNamedParameter($calendar->getResourceId()),
-					'publicuri' => $query->createNamedParameter($publicUri)
-				]);
-			$query->executeStatement();
-
-			$this->dispatcher->dispatchTyped(new CalendarPublishedEvent($calendarId, $calendarData, $publicUri));
-			return $publicUri;
-		}
-		$query->delete('dav_shares')
-			->where($query->expr()->eq('resourceid', $query->createNamedParameter($calendar->getResourceId())))
-			->andWhere($query->expr()->eq('access', $query->createNamedParameter(self::ACCESS_PUBLIC)));
-		$query->executeStatement();
-
-		$this->dispatcher->dispatchTyped(new CalendarUnpublishedEvent($calendarId, $calendarData));
-		return null;
-	}
-
-	/**
-	 * @param \OCA\DAV\CalDAV\Calendar $calendar
-	 * @return mixed
-	 */
-	public function getPublishStatus($calendar) {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select('publicuri')
-			->from('dav_shares')
-			->where($query->expr()->eq('resourceid', $query->createNamedParameter($calendar->getResourceId())))
-			->andWhere($query->expr()->eq('access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
-			->executeQuery();
-
-		$row = $result->fetch();
-		$result->closeCursor();
-		return $row ? reset($row) : false;
-	}
-
-	/**
-	 * @param int $resourceId
-	 * @param list<array{privilege: string, principal: string, protected: bool}> $acl
-	 * @return list<array{privilege: string, principal: string, protected: bool}>
-	 */
-	public function applyShareAcl(int $resourceId, array $acl): array {
-		return $this->calendarSharingBackend->applyShareAcl($resourceId, $acl);
-	}
-
-	/**
-	 * update properties table
-	 *
-	 * @param int $calendarId
-	 * @param string $objectUri
-	 * @param string $calendarData
-	 * @param int $calendarType
-	 */
-	public function updateProperties($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
-		$objectId = $this->getCalendarObjectId($calendarId, $objectUri, $calendarType);
-
-		try {
-			$vCalendar = $this->readCalendarData($calendarData);
-		} catch (\Exception $ex) {
-			return;
-		}
-
-		$this->purgeProperties($calendarId, $objectId);
-
-		$query = $this->db->getQueryBuilder();
-		$query->insert($this->dbObjectPropertiesTable)
-			->values(
-				[
-					'calendarid' => $query->createNamedParameter($calendarId),
-					'calendartype' => $query->createNamedParameter($calendarType),
-					'objectid' => $query->createNamedParameter($objectId),
-					'name' => $query->createParameter('name'),
-					'parameter' => $query->createParameter('parameter'),
-					'value' => $query->createParameter('value'),
-				]
-			);
-
-		$indexComponents = ['VEVENT', 'VJOURNAL', 'VTODO'];
-		foreach ($vCalendar->getComponents() as $component) {
-			if (!in_array($component->name, $indexComponents)) {
-				continue;
-			}
-
-			foreach ($component->children() as $property) {
-				if (in_array($property->name, self::INDEXED_PROPERTIES, true)) {
-					$value = $property->getValue();
-					// is this a shitty db?
-					if (!$this->db->supports4ByteText()) {
-						$value = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $value);
-					}
-					$value = mb_strcut($value, 0, 254);
-
-					$query->setParameter('name', $property->name);
-					$query->setParameter('parameter', null);
-					$query->setParameter('value', $value);
-					$query->executeStatement();
-				}
-
-				if (array_key_exists($property->name, self::$indexParameters)) {
-					$parameters = $property->parameters();
-					$indexedParametersForProperty = self::$indexParameters[$property->name];
-
-					foreach ($parameters as $key => $value) {
-						if (in_array($key, $indexedParametersForProperty)) {
-							// is this a shitty db?
-							if ($this->db->supports4ByteText()) {
-								$value = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $value);
-							}
-
-							$query->setParameter('name', $property->name);
-							$query->setParameter('parameter', mb_strcut($key, 0, 254));
-							$query->setParameter('value', mb_strcut($value, 0, 254));
-							$query->executeStatement();
-						}
-					}
-				}
-			}
-		}
-	}
-
-	/**
-	 * deletes all birthday calendars
-	 */
-	public function deleteAllBirthdayCalendars() {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['id'])->from('calendars')
-			->where($query->expr()->eq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)))
-			->executeQuery();
-
-		$ids = $result->fetchAll();
-		$result->closeCursor();
-		foreach ($ids as $id) {
-			$this->deleteCalendar(
-				$id['id'],
-				true // No data to keep in the trashbin, if the user re-enables then we regenerate
-			);
-		}
-	}
-
-	/**
-	 * @param $subscriptionId
-	 */
-	public function purgeAllCachedEventsForSubscription($subscriptionId) {
-		$query = $this->db->getQueryBuilder();
-		$query->select('uri')
-			->from('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)));
-		$stmt = $query->executeQuery();
-
-		$uris = [];
-		foreach ($stmt->fetchAll() as $row) {
-			$uris[] = $row['uri'];
-		}
-		$stmt->closeCursor();
-
-		$query = $this->db->getQueryBuilder();
-		$query->delete('calendarobjects')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		$query->delete('calendarchanges')
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		$query->delete($this->dbObjectPropertiesTable)
-			->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
-			->executeStatement();
-
-		foreach ($uris as $uri) {
-			$this->addChange($subscriptionId, $uri, 3, self::CALENDAR_TYPE_SUBSCRIPTION);
-		}
-	}
-
-	/**
-	 * Move a calendar from one user to another
-	 *
-	 * @param string $uriName
-	 * @param string $uriOrigin
-	 * @param string $uriDestination
-	 * @param string $newUriName (optional) the new uriName
-	 */
-	public function moveCalendar($uriName, $uriOrigin, $uriDestination, $newUriName = null) {
-		$query = $this->db->getQueryBuilder();
-		$query->update('calendars')
-			->set('principaluri', $query->createNamedParameter($uriDestination))
-			->set('uri', $query->createNamedParameter($newUriName ?: $uriName))
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($uriOrigin)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($uriName)))
-			->executeStatement();
-	}
-
-	/**
-	 * read VCalendar data into a VCalendar object
-	 *
-	 * @param string $objectData
-	 * @return VCalendar
-	 */
-	protected function readCalendarData($objectData) {
-		return Reader::read($objectData);
-	}
-
-	/**
-	 * delete all properties from a given calendar object
-	 *
-	 * @param int $calendarId
-	 * @param int $objectId
-	 */
-	protected function purgeProperties($calendarId, $objectId) {
-		$query = $this->db->getQueryBuilder();
-		$query->delete($this->dbObjectPropertiesTable)
-			->where($query->expr()->eq('objectid', $query->createNamedParameter($objectId)))
-			->andWhere($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)));
-		$query->executeStatement();
-	}
-
-	/**
-	 * get ID from a given calendar object
-	 *
-	 * @param int $calendarId
-	 * @param string $uri
-	 * @param int $calendarType
-	 * @return int
-	 */
-	protected function getCalendarObjectId($calendarId, $uri, $calendarType):int {
-		$query = $this->db->getQueryBuilder();
-		$query->select('id')
-			->from('calendarobjects')
-			->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
-			->andWhere($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
-			->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)));
-
-		$result = $query->executeQuery();
-		$objectIds = $result->fetch();
-		$result->closeCursor();
-
-		if (!isset($objectIds['id'])) {
-			throw new \InvalidArgumentException('Calendarobject does not exists: ' . $uri);
-		}
-
-		return (int)$objectIds['id'];
-	}
-
-	/**
-	 * @throws \InvalidArgumentException
-	 */
-	public function pruneOutdatedSyncTokens(int $keep = 10_000): int {
-		if ($keep < 0) {
-			throw new \InvalidArgumentException();
-		}
-		$query = $this->db->getQueryBuilder();
-		$query->delete('calendarchanges')
-			->orderBy('id', 'DESC')
-			->setFirstResult($keep);
-		return $query->executeStatement();
-	}
-
-	/**
-	 * return legacy endpoint principal name to new principal name
-	 *
-	 * @param $principalUri
-	 * @param $toV2
-	 * @return string
-	 */
-	private function convertPrincipal($principalUri, $toV2) {
-		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
-			[, $name] = Uri\split($principalUri);
-			if ($toV2 === true) {
-				return "principals/users/$name";
-			}
-			return "principals/$name";
-		}
-		return $principalUri;
-	}
-
-	/**
-	 * adds information about an owner to the calendar data
-	 *
-	 */
-	private function addOwnerPrincipalToCalendar(array $calendarInfo): array {
-		$ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
-		$displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
-		if (isset($calendarInfo[$ownerPrincipalKey])) {
-			$uri = $calendarInfo[$ownerPrincipalKey];
-		} else {
-			$uri = $calendarInfo['principaluri'];
-		}
-
-		$principalInformation = $this->principalBackend->getPrincipalByPath($uri);
-		if (isset($principalInformation['{DAV:}displayname'])) {
-			$calendarInfo[$displaynameKey] = $principalInformation['{DAV:}displayname'];
-		}
-		return $calendarInfo;
-	}
-
-	private function addResourceTypeToCalendar(array $row, array $calendar): array {
-		if (isset($row['deleted_at'])) {
-			// Columns is set and not null -> this is a deleted calendar
-			// we send a custom resourcetype to hide the deleted calendar
-			// from ordinary DAV clients, but the Calendar app will know
-			// how to handle this special resource.
-			$calendar['{DAV:}resourcetype'] = new DAV\Xml\Property\ResourceType([
-				'{DAV:}collection',
-				sprintf('{%s}deleted-calendar', \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD),
-			]);
-		}
-		return $calendar;
-	}
-
-	/**
-	 * Amend the calendar info with database row data
-	 *
-	 * @param array $row
-	 * @param array $calendar
-	 *
-	 * @return array
-	 */
-	private function rowToCalendar($row, array $calendar): array {
-		foreach ($this->propertyMap as $xmlName => [$dbName, $type]) {
-			$value = $row[$dbName];
-			if ($value !== null) {
-				settype($value, $type);
-			}
-			$calendar[$xmlName] = $value;
-		}
-		return $calendar;
-	}
-
-	/**
-	 * Amend the subscription info with database row data
-	 *
-	 * @param array $row
-	 * @param array $subscription
-	 *
-	 * @return array
-	 */
-	private function rowToSubscription($row, array $subscription): array {
-		foreach ($this->subscriptionPropertyMap as $xmlName => [$dbName, $type]) {
-			$value = $row[$dbName];
-			if ($value !== null) {
-				settype($value, $type);
-			}
-			$subscription[$xmlName] = $value;
-		}
-		return $subscription;
-	}
+    use TTransactional;
+
+    public const CALENDAR_TYPE_CALENDAR = 0;
+    public const CALENDAR_TYPE_SUBSCRIPTION = 1;
+
+    public const PERSONAL_CALENDAR_URI = 'personal';
+    public const PERSONAL_CALENDAR_NAME = 'Personal';
+
+    public const RESOURCE_BOOKING_CALENDAR_URI = 'calendar';
+    public const RESOURCE_BOOKING_CALENDAR_NAME = 'Calendar';
+
+    /**
+     * We need to specify a max date, because we need to stop *somewhere*
+     *
+     * On 32 bit system the maximum for a signed integer is 2147483647, so
+     * MAX_DATE cannot be higher than date('Y-m-d', 2147483647) which results
+     * in 2038-01-19 to avoid problems when the date is converted
+     * to a unix timestamp.
+     */
+    public const MAX_DATE = '2038-01-01';
+
+    public const ACCESS_PUBLIC = 4;
+    public const CLASSIFICATION_PUBLIC = 0;
+    public const CLASSIFICATION_PRIVATE = 1;
+    public const CLASSIFICATION_CONFIDENTIAL = 2;
+
+    /**
+     * List of CalDAV properties, and how they map to database field names and their type
+     * Add your own properties by simply adding on to this array.
+     *
+     * @var array
+     * @psalm-var array<string, string[]>
+     */
+    public array $propertyMap = [
+        '{DAV:}displayname' => ['displayname', 'string'],
+        '{urn:ietf:params:xml:ns:caldav}calendar-description' => ['description', 'string'],
+        '{urn:ietf:params:xml:ns:caldav}calendar-timezone' => ['timezone', 'string'],
+        '{http://apple.com/ns/ical/}calendar-order' => ['calendarorder', 'int'],
+        '{http://apple.com/ns/ical/}calendar-color' => ['calendarcolor', 'string'],
+        '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => ['deleted_at', 'int'],
+    ];
+
+    /**
+     * List of subscription properties, and how they map to database field names.
+     *
+     * @var array
+     */
+    public array $subscriptionPropertyMap = [
+        '{DAV:}displayname' => ['displayname', 'string'],
+        '{http://apple.com/ns/ical/}refreshrate' => ['refreshrate', 'string'],
+        '{http://apple.com/ns/ical/}calendar-order' => ['calendarorder', 'int'],
+        '{http://apple.com/ns/ical/}calendar-color' => ['calendarcolor', 'string'],
+        '{http://calendarserver.org/ns/}subscribed-strip-todos' => ['striptodos', 'bool'],
+        '{http://calendarserver.org/ns/}subscribed-strip-alarms' => ['stripalarms', 'string'],
+        '{http://calendarserver.org/ns/}subscribed-strip-attachments' => ['stripattachments', 'string'],
+    ];
+
+    /**
+     * properties to index
+     *
+     * This list has to be kept in sync with ICalendarQuery::SEARCH_PROPERTY_*
+     *
+     * @see \OCP\Calendar\ICalendarQuery
+     */
+    private const INDEXED_PROPERTIES = [
+        'CATEGORIES',
+        'COMMENT',
+        'DESCRIPTION',
+        'LOCATION',
+        'RESOURCES',
+        'STATUS',
+        'SUMMARY',
+        'ATTENDEE',
+        'CONTACT',
+        'ORGANIZER'
+    ];
+
+    /** @var array parameters to index */
+    public static array $indexParameters = [
+        'ATTENDEE' => ['CN'],
+        'ORGANIZER' => ['CN'],
+    ];
+
+    /**
+     * @var string[] Map of uid => display name
+     */
+    protected array $userDisplayNames;
+
+    private IDBConnection $db;
+    private Backend $calendarSharingBackend;
+    private Principal $principalBackend;
+    private IUserManager $userManager;
+    private ISecureRandom $random;
+    private LoggerInterface $logger;
+    private IEventDispatcher $dispatcher;
+    private IConfig $config;
+    private bool $legacyEndpoint;
+    private string $dbObjectPropertiesTable = 'calendarobjects_props';
+
+    public function __construct(IDBConnection $db,
+                                Principal $principalBackend,
+                                IUserManager $userManager,
+                                IGroupManager $groupManager,
+                                ISecureRandom $random,
+                                LoggerInterface $logger,
+                                IEventDispatcher $dispatcher,
+                                IConfig $config,
+                                bool $legacyEndpoint = false) {
+        $this->db = $db;
+        $this->principalBackend = $principalBackend;
+        $this->userManager = $userManager;
+        $this->calendarSharingBackend = new Backend($this->db, $this->userManager, $groupManager, $principalBackend, 'calendar');
+        $this->random = $random;
+        $this->logger = $logger;
+        $this->dispatcher = $dispatcher;
+        $this->config = $config;
+        $this->legacyEndpoint = $legacyEndpoint;
+    }
+
+    /**
+     * Return the number of calendars for a principal
+     *
+     * By default this excludes the automatically generated birthday calendar
+     *
+     * @param $principalUri
+     * @param bool $excludeBirthday
+     * @return int
+     */
+    public function getCalendarsForUserCount($principalUri, $excludeBirthday = true) {
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $query = $this->db->getQueryBuilder();
+        $query->select($query->func()->count('*'))
+            ->from('calendars');
+
+        if ($principalUri === '') {
+            $query->where($query->expr()->emptyString('principaluri'));
+        } else {
+            $query->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+        }
+
+        if ($excludeBirthday) {
+            $query->andWhere($query->expr()->neq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)));
+        }
+
+        $result = $query->executeQuery();
+        $column = (int)$result->fetchOne();
+        $result->closeCursor();
+        return $column;
+    }
+
+    /**
+     * @return array{id: int, deleted_at: int}[]
+     */
+    public function getDeletedCalendars(int $deletedBefore): array {
+        $qb = $this->db->getQueryBuilder();
+        $qb->select(['id', 'deleted_at'])
+            ->from('calendars')
+            ->where($qb->expr()->isNotNull('deleted_at'))
+            ->andWhere($qb->expr()->lt('deleted_at', $qb->createNamedParameter($deletedBefore)));
+        $result = $qb->executeQuery();
+        $raw = $result->fetchAll();
+        $result->closeCursor();
+        return array_map(function ($row) {
+            return [
+                'id' => (int) $row['id'],
+                'deleted_at' => (int) $row['deleted_at'],
+            ];
+        }, $raw);
+    }
+
+    /**
+     * Returns a list of calendars for a principal.
+     *
+     * Every project is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    calendar. This can be the same as the uri or a database key.
+     *  * uri, which the basename of the uri with which the calendar is
+     *    accessed.
+     *  * principaluri. The owner of the calendar. Almost always the same as
+     *    principalUri passed to this method.
+     *
+     * Furthermore it can contain webdav properties in clark notation. A very
+     * common one is '{DAV:}displayname'.
+     *
+     * Many clients also require:
+     * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     * For this property, you can just return an instance of
+     * Sabre\CalDAV\Property\SupportedCalendarComponentSet.
+     *
+     * If you return {http://sabredav.org/ns}read-only and set the value to 1,
+     * ACL will automatically be put in read-only mode.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    public function getCalendarsForUser($principalUri) {
+        $principalUriOriginal = $principalUri;
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'synctoken';
+        $fields[] = 'components';
+        $fields[] = 'principaluri';
+        $fields[] = 'transparent';
+
+        // Making fields a comma-delimited list
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)
+            ->from('calendars')
+            ->orderBy('calendarorder', 'ASC');
+
+        if ($principalUri === '') {
+            $query->where($query->expr()->emptyString('principaluri'));
+        } else {
+            $query->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+        }
+
+        $result = $query->executeQuery();
+
+        $calendars = [];
+        while ($row = $result->fetch()) {
+            $row['principaluri'] = (string) $row['principaluri'];
+            $components = [];
+            if ($row['components']) {
+                $components = explode(',',$row['components']);
+            }
+
+            $calendar = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+                '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+                '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+                '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($principalUri, !$this->legacyEndpoint),
+            ];
+
+            $calendar = $this->rowToCalendar($row, $calendar);
+            $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+            $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+            if (!isset($calendars[$calendar['id']])) {
+                $calendars[$calendar['id']] = $calendar;
+            }
+        }
+        $result->closeCursor();
+
+        // query for shared calendars
+        $principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
+        $principals = array_merge($principals, $this->principalBackend->getCircleMembership($principalUriOriginal));
+
+        $principals[] = $principalUri;
+
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'a.id';
+        $fields[] = 'a.uri';
+        $fields[] = 'a.synctoken';
+        $fields[] = 'a.components';
+        $fields[] = 'a.principaluri';
+        $fields[] = 'a.transparent';
+        $fields[] = 's.access';
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)
+            ->from('dav_shares', 's')
+            ->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
+            ->where($query->expr()->in('s.principaluri', $query->createParameter('principaluri')))
+            ->andWhere($query->expr()->eq('s.type', $query->createParameter('type')))
+            ->setParameter('type', 'calendar')
+            ->setParameter('principaluri', $principals, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY);
+
+        $result = $query->executeQuery();
+
+        $readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
+        while ($row = $result->fetch()) {
+            $row['principaluri'] = (string) $row['principaluri'];
+            if ($row['principaluri'] === $principalUri) {
+                continue;
+            }
+
+            $readOnly = (int) $row['access'] === Backend::ACCESS_READ;
+            if (isset($calendars[$row['id']])) {
+                if ($readOnly) {
+                    // New share can not have more permissions then the old one.
+                    continue;
+                }
+                if (isset($calendars[$row['id']][$readOnlyPropertyName]) &&
+                    $calendars[$row['id']][$readOnlyPropertyName] === 0) {
+                    // Old share is already read-write, no more permissions can be gained
+                    continue;
+                }
+            }
+
+            [, $name] = Uri\split($row['principaluri']);
+            $uri = $row['uri'] . '_shared_by_' . $name;
+            $row['displayname'] = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
+            $components = [];
+            if ($row['components']) {
+                $components = explode(',',$row['components']);
+            }
+            $calendar = [
+                'id' => $row['id'],
+                'uri' => $uri,
+                'principaluri' => $this->convertPrincipal($principalUri, !$this->legacyEndpoint),
+                '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+                '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+                '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp('transparent'),
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+                $readOnlyPropertyName => $readOnly,
+            ];
+
+            $calendar = $this->rowToCalendar($row, $calendar);
+            $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+            $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+            $calendars[$calendar['id']] = $calendar;
+        }
+        $result->closeCursor();
+
+        return array_values($calendars);
+    }
+
+    /**
+     * @param $principalUri
+     * @return array
+     */
+    public function getUsersOwnCalendars($principalUri) {
+        $principalUri = $this->convertPrincipal($principalUri, true);
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'synctoken';
+        $fields[] = 'components';
+        $fields[] = 'principaluri';
+        $fields[] = 'transparent';
+        // Making fields a comma-delimited list
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)->from('calendars')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+            ->orderBy('calendarorder', 'ASC');
+        $stmt = $query->executeQuery();
+        $calendars = [];
+        while ($row = $stmt->fetch()) {
+            $row['principaluri'] = (string) $row['principaluri'];
+            $components = [];
+            if ($row['components']) {
+                $components = explode(',',$row['components']);
+            }
+            $calendar = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+                '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+                '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+                '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+            ];
+
+            $calendar = $this->rowToCalendar($row, $calendar);
+            $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+            $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+            if (!isset($calendars[$calendar['id']])) {
+                $calendars[$calendar['id']] = $calendar;
+            }
+        }
+        $stmt->closeCursor();
+        return array_values($calendars);
+    }
+
+
+    /**
+     * @param $uid
+     * @return string
+     */
+    private function getUserDisplayName($uid) {
+        if (!isset($this->userDisplayNames[$uid])) {
+            $user = $this->userManager->get($uid);
+
+            if ($user instanceof IUser) {
+                $this->userDisplayNames[$uid] = $user->getDisplayName();
+            } else {
+                $this->userDisplayNames[$uid] = $uid;
+            }
+        }
+
+        return $this->userDisplayNames[$uid];
+    }
+
+    /**
+     * @return array
+     */
+    public function getPublicCalendars() {
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'a.id';
+        $fields[] = 'a.uri';
+        $fields[] = 'a.synctoken';
+        $fields[] = 'a.components';
+        $fields[] = 'a.principaluri';
+        $fields[] = 'a.transparent';
+        $fields[] = 's.access';
+        $fields[] = 's.publicuri';
+        $calendars = [];
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select($fields)
+            ->from('dav_shares', 's')
+            ->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
+            ->where($query->expr()->in('s.access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
+            ->andWhere($query->expr()->eq('s.type', $query->createNamedParameter('calendar')))
+            ->executeQuery();
+
+        while ($row = $result->fetch()) {
+            $row['principaluri'] = (string) $row['principaluri'];
+            [, $name] = Uri\split($row['principaluri']);
+            $row['displayname'] = $row['displayname'] . "($name)";
+            $components = [];
+            if ($row['components']) {
+                $components = explode(',',$row['components']);
+            }
+            $calendar = [
+                'id' => $row['id'],
+                'uri' => $row['publicuri'],
+                'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+                '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+                '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+                '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], $this->legacyEndpoint),
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only' => (int)$row['access'] === Backend::ACCESS_READ,
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}public' => (int)$row['access'] === self::ACCESS_PUBLIC,
+            ];
+
+            $calendar = $this->rowToCalendar($row, $calendar);
+            $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+            $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+            if (!isset($calendars[$calendar['id']])) {
+                $calendars[$calendar['id']] = $calendar;
+            }
+        }
+        $result->closeCursor();
+
+        return array_values($calendars);
+    }
+
+    /**
+     * @param string $uri
+     * @return array
+     * @throws NotFound
+     */
+    public function getPublicCalendar($uri) {
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'a.id';
+        $fields[] = 'a.uri';
+        $fields[] = 'a.synctoken';
+        $fields[] = 'a.components';
+        $fields[] = 'a.principaluri';
+        $fields[] = 'a.transparent';
+        $fields[] = 's.access';
+        $fields[] = 's.publicuri';
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select($fields)
+            ->from('dav_shares', 's')
+            ->join('s', 'calendars', 'a', $query->expr()->eq('s.resourceid', 'a.id'))
+            ->where($query->expr()->in('s.access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
+            ->andWhere($query->expr()->eq('s.type', $query->createNamedParameter('calendar')))
+            ->andWhere($query->expr()->eq('s.publicuri', $query->createNamedParameter($uri)))
+            ->executeQuery();
+
+        $row = $result->fetch();
+
+        $result->closeCursor();
+
+        if ($row === false) {
+            throw new NotFound('Node with name \'' . $uri . '\' could not be found');
+        }
+
+        $row['principaluri'] = (string) $row['principaluri'];
+        [, $name] = Uri\split($row['principaluri']);
+        $row['displayname'] = $row['displayname'] . ' ' . "($name)";
+        $components = [];
+        if ($row['components']) {
+            $components = explode(',',$row['components']);
+        }
+        $calendar = [
+            'id' => $row['id'],
+            'uri' => $row['publicuri'],
+            'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+            '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+            '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+            '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+            '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+            '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only' => (int)$row['access'] === Backend::ACCESS_READ,
+            '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}public' => (int)$row['access'] === self::ACCESS_PUBLIC,
+        ];
+
+        $calendar = $this->rowToCalendar($row, $calendar);
+        $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+        $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+        return $calendar;
+    }
+
+    /**
+     * @param string $principal
+     * @param string $uri
+     * @return array|null
+     */
+    public function getCalendarByUri($principal, $uri) {
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'synctoken';
+        $fields[] = 'components';
+        $fields[] = 'principaluri';
+        $fields[] = 'transparent';
+
+        // Making fields a comma-delimited list
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)->from('calendars')
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
+            ->andWhere($query->expr()->eq('principaluri', $query->createNamedParameter($principal)))
+            ->setMaxResults(1);
+        $stmt = $query->executeQuery();
+
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+        if ($row === false) {
+            return null;
+        }
+
+        $row['principaluri'] = (string) $row['principaluri'];
+        $components = [];
+        if ($row['components']) {
+            $components = explode(',',$row['components']);
+        }
+
+        $calendar = [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+            '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+            '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+            '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+        ];
+
+        $calendar = $this->rowToCalendar($row, $calendar);
+        $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+        $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+        return $calendar;
+    }
+
+    /**
+     * @return array{id: int, uri: string, '{http://calendarserver.org/ns/}getctag': string, '{http://sabredav.org/ns}sync-token': int, '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set': SupportedCalendarComponentSet, '{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp': ScheduleCalendarTransp }|null
+     */
+    public function getCalendarById(int $calendarId): ?array {
+        $fields = array_column($this->propertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'synctoken';
+        $fields[] = 'components';
+        $fields[] = 'principaluri';
+        $fields[] = 'transparent';
+
+        // Making fields a comma-delimited list
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)->from('calendars')
+            ->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)))
+            ->setMaxResults(1);
+        $stmt = $query->executeQuery();
+
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+        if ($row === false) {
+            return null;
+        }
+
+        $row['principaluri'] = (string) $row['principaluri'];
+        $components = [];
+        if ($row['components']) {
+            $components = explode(',',$row['components']);
+        }
+
+        $calendar = [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'principaluri' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
+            '{' . Plugin::NS_CALENDARSERVER . '}getctag' => 'http://sabre.io/ns/sync/' . ($row['synctoken']?$row['synctoken']:'0'),
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken'] ?? 0,
+            '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet($components),
+            '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
+        ];
+
+        $calendar = $this->rowToCalendar($row, $calendar);
+        $calendar = $this->addOwnerPrincipalToCalendar($calendar);
+        $calendar = $this->addResourceTypeToCalendar($row, $calendar);
+
+        return $calendar;
+    }
+
+    /**
+     * @param $subscriptionId
+     */
+    public function getSubscriptionById($subscriptionId) {
+        $fields = array_column($this->subscriptionPropertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'source';
+        $fields[] = 'synctoken';
+        $fields[] = 'principaluri';
+        $fields[] = 'lastmodified';
+
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)
+            ->from('calendarsubscriptions')
+            ->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
+            ->orderBy('calendarorder', 'asc');
+        $stmt = $query->executeQuery();
+
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+        if ($row === false) {
+            return null;
+        }
+
+        $row['principaluri'] = (string) $row['principaluri'];
+        $subscription = [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'principaluri' => $row['principaluri'],
+            'source' => $row['source'],
+            'lastmodified' => $row['lastmodified'],
+            '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
+            '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+        ];
+
+        return $this->rowToSubscription($row, $subscription);
+    }
+
+    /**
+     * Creates a new calendar for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used to reference
+     * this calendar in other methods, such as updateCalendar.
+     *
+     * @param string $principalUri
+     * @param string $calendarUri
+     * @param array $properties
+     * @return int
+     *
+     * @throws CalendarException
+     */
+    public function createCalendar($principalUri, $calendarUri, array $properties) {
+        if (strlen($calendarUri) > 255) {
+            throw new CalendarException('URI too long. Calendar not created');
+        }
+
+        $values = [
+            'principaluri' => $this->convertPrincipal($principalUri, true),
+            'uri' => $calendarUri,
+            'synctoken' => 1,
+            'transparent' => 0,
+            'components' => 'VEVENT,VTODO',
+            'displayname' => $calendarUri
+        ];
+
+        // Default value
+        $sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
+        if (isset($properties[$sccs])) {
+            if (!($properties[$sccs] instanceof SupportedCalendarComponentSet)) {
+                throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
+            }
+            $values['components'] = implode(',',$properties[$sccs]->getValue());
+        } elseif (isset($properties['components'])) {
+            // Allow to provide components internally without having
+            // to create a SupportedCalendarComponentSet object
+            $values['components'] = $properties['components'];
+        }
+
+        $transp = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
+        if (isset($properties[$transp])) {
+            $values['transparent'] = (int) ($properties[$transp]->getValue() === 'transparent');
+        }
+
+        foreach ($this->propertyMap as $xmlName => [$dbName, $type]) {
+            if (isset($properties[$xmlName])) {
+                $values[$dbName] = $properties[$xmlName];
+            }
+        }
+
+        [$calendarId, $calendarData] = $this->atomic(function() use ($values) {
+            $query = $this->db->getQueryBuilder();
+            $query->insert('calendars');
+            foreach ($values as $column => $value) {
+                $query->setValue($column, $query->createNamedParameter($value));
+            }
+            $query->executeStatement();
+            $calendarId = $query->getLastInsertId();
+
+            $calendarData = $this->getCalendarById($calendarId);
+            return [$calendarId, $calendarData];
+        }, $this->db);
+
+        $this->dispatcher->dispatchTyped(new CalendarCreatedEvent((int)$calendarId, $calendarData));
+
+        return $calendarId;
+    }
+
+    /**
+     * Updates properties for a calendar.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documentation for more info and examples.
+     *
+     * @param mixed $calendarId
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    public function updateCalendar($calendarId, PropPatch $propPatch) {
+        $supportedProperties = array_keys($this->propertyMap);
+        $supportedProperties[] = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
+
+        $propPatch->handle($supportedProperties, function ($mutations) use ($calendarId) {
+            $newValues = [];
+            foreach ($mutations as $propertyName => $propertyValue) {
+                switch ($propertyName) {
+                    case '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp':
+                        $fieldName = 'transparent';
+                        $newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
+                        break;
+                    default:
+                        $fieldName = $this->propertyMap[$propertyName][0];
+                        $newValues[$fieldName] = $propertyValue;
+                        break;
+                }
+            }
+            $query = $this->db->getQueryBuilder();
+            $query->update('calendars');
+            foreach ($newValues as $fieldName => $value) {
+                $query->set($fieldName, $query->createNamedParameter($value));
+            }
+            $query->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)));
+            $query->executeStatement();
+
+            $this->addChange($calendarId, "", 2);
+
+            $calendarData = $this->getCalendarById($calendarId);
+            $shares = $this->getShares($calendarId);
+            $this->dispatcher->dispatchTyped(new CalendarUpdatedEvent($calendarId, $calendarData, $shares, $mutations));
+
+            return true;
+        });
+    }
+
+    /**
+     * Delete a calendar and all it's objects
+     *
+     * @param mixed $calendarId
+     * @return void
+     */
+    public function deleteCalendar($calendarId, bool $forceDeletePermanently = false) {
+        // The calendar is deleted right away if this is either enforced by the caller
+        // or the special contacts birthday calendar or when the preference of an empty
+        // retention (0 seconds) is set, which signals a disabled trashbin.
+        $calendarData = $this->getCalendarById($calendarId);
+        $isBirthdayCalendar = isset($calendarData['uri']) && $calendarData['uri'] === BirthdayService::BIRTHDAY_CALENDAR_URI;
+        $trashbinDisabled = $this->config->getAppValue(Application::APP_ID, RetentionService::RETENTION_CONFIG_KEY) === '0';
+        if ($forceDeletePermanently || $isBirthdayCalendar || $trashbinDisabled) {
+            $calendarData = $this->getCalendarById($calendarId);
+            $shares = $this->getShares($calendarId);
+
+            $qbDeleteCalendarObjectProps = $this->db->getQueryBuilder();
+            $qbDeleteCalendarObjectProps->delete($this->dbObjectPropertiesTable)
+                ->where($qbDeleteCalendarObjectProps->expr()->eq('calendarid', $qbDeleteCalendarObjectProps->createNamedParameter($calendarId)))
+                ->andWhere($qbDeleteCalendarObjectProps->expr()->eq('calendartype', $qbDeleteCalendarObjectProps->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
+                ->executeStatement();
+
+            $qbDeleteCalendarObjects = $this->db->getQueryBuilder();
+            $qbDeleteCalendarObjects->delete('calendarobjects')
+                ->where($qbDeleteCalendarObjects->expr()->eq('calendarid', $qbDeleteCalendarObjects->createNamedParameter($calendarId)))
+                ->andWhere($qbDeleteCalendarObjects->expr()->eq('calendartype', $qbDeleteCalendarObjects->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
+                ->executeStatement();
+
+            $qbDeleteCalendarChanges = $this->db->getQueryBuilder();
+            $qbDeleteCalendarObjects->delete('calendarchanges')
+                ->where($qbDeleteCalendarChanges->expr()->eq('calendarid', $qbDeleteCalendarChanges->createNamedParameter($calendarId)))
+                ->andWhere($qbDeleteCalendarChanges->expr()->eq('calendartype', $qbDeleteCalendarChanges->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)))
+                ->executeStatement();
+
+            $this->calendarSharingBackend->deleteAllShares($calendarId);
+
+            $qbDeleteCalendar = $this->db->getQueryBuilder();
+            $qbDeleteCalendarObjects->delete('calendars')
+                ->where($qbDeleteCalendar->expr()->eq('id', $qbDeleteCalendar->createNamedParameter($calendarId)))
+                ->executeStatement();
+
+            // Only dispatch if we actually deleted anything
+            if ($calendarData) {
+                $this->dispatcher->dispatchTyped(new CalendarDeletedEvent($calendarId, $calendarData, $shares));
+            }
+        } else {
+            $qbMarkCalendarDeleted = $this->db->getQueryBuilder();
+            $qbMarkCalendarDeleted->update('calendars')
+                ->set('deleted_at', $qbMarkCalendarDeleted->createNamedParameter(time()))
+                ->where($qbMarkCalendarDeleted->expr()->eq('id', $qbMarkCalendarDeleted->createNamedParameter($calendarId)))
+                ->executeStatement();
+
+            $calendarData = $this->getCalendarById($calendarId);
+            $shares = $this->getShares($calendarId);
+            if ($calendarData) {
+                $this->dispatcher->dispatchTyped(new CalendarMovedToTrashEvent(
+                    $calendarId,
+                    $calendarData,
+                    $shares
+                ));
+            }
+        }
+    }
+
+    public function restoreCalendar(int $id): void {
+        $qb = $this->db->getQueryBuilder();
+        $update = $qb->update('calendars')
+            ->set('deleted_at', $qb->createNamedParameter(null))
+            ->where($qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
+        $update->executeStatement();
+
+        $calendarData = $this->getCalendarById($id);
+        $shares = $this->getShares($id);
+        if ($calendarData === null) {
+            throw new RuntimeException('Calendar data that was just written can\'t be read back. Check your database configuration.');
+        }
+        $this->dispatcher->dispatchTyped(new CalendarRestoredEvent(
+            $id,
+            $calendarData,
+            $shares
+        ));
+    }
+
+    /**
+     * Delete all of an user's shares
+     *
+     * @param string $principaluri
+     * @return void
+     */
+    public function deleteAllSharesByUser($principaluri) {
+        $this->calendarSharingBackend->deleteAllSharesByUser($principaluri);
+    }
+
+    /**
+     * Returns all calendar objects within a calendar.
+     *
+     * Every item contains an array with the following keys:
+     *   * calendardata - The iCalendar-compatible calendar data
+     *   * uri - a unique key which will be used to construct the uri. This can
+     *     be any arbitrary string, but making sure it ends with '.ics' is a
+     *     good idea. This is only the basename, or filename, not the full
+     *     path.
+     *   * lastmodified - a timestamp of the last modification time
+     *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
+     *   '"abcdef"')
+     *   * size - The size of the calendar objects, in bytes.
+     *   * component - optional, a string containing the type of object, such
+     *     as 'vevent' or 'vtodo'. If specified, this will be used to populate
+     *     the Content-Type header.
+     *
+     * Note that the etag is optional, but it's highly encouraged to return for
+     * speed reasons.
+     *
+     * The calendardata is also optional. If it's not returned
+     * 'getCalendarObject' will be called later, which *is* expected to return
+     * calendardata.
+     *
+     * If neither etag or size are specified, the calendardata will be
+     * used/fetched to determine these numbers. If both are specified the
+     * amount of times this is needed is reduced by a great degree.
+     *
+     * @param mixed $calendarId
+     * @param int $calendarType
+     * @return array
+     */
+    public function getCalendarObjects($calendarId, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'componenttype', 'classification'])
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
+            ->andWhere($query->expr()->isNull('deleted_at'));
+        $stmt = $query->executeQuery();
+
+        $result = [];
+        foreach ($stmt->fetchAll() as $row) {
+            $result[] = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag' => '"' . $row['etag'] . '"',
+                'calendarid' => $row['calendarid'],
+                'size' => (int)$row['size'],
+                'component' => strtolower($row['componenttype']),
+                'classification' => (int)$row['classification']
+            ];
+        }
+        $stmt->closeCursor();
+
+        return $result;
+    }
+
+    public function getDeletedCalendarObjects(int $deletedBefore): array {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.calendartype', 'co.size', 'co.componenttype', 'co.classification', 'co.deleted_at'])
+            ->from('calendarobjects', 'co')
+            ->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
+            ->where($query->expr()->isNotNull('co.deleted_at'))
+            ->andWhere($query->expr()->lt('co.deleted_at', $query->createNamedParameter($deletedBefore)));
+        $stmt = $query->executeQuery();
+
+        $result = [];
+        foreach ($stmt->fetchAll() as $row) {
+            $result[] = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag' => '"' . $row['etag'] . '"',
+                'calendarid' => (int) $row['calendarid'],
+                'calendartype' => (int) $row['calendartype'],
+                'size' => (int) $row['size'],
+                'component' => strtolower($row['componenttype']),
+                'classification' => (int) $row['classification'],
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
+            ];
+        }
+        $stmt->closeCursor();
+
+        return $result;
+    }
+
+    /**
+     * Return all deleted calendar objects by the given principal that are not
+     * in deleted calendars.
+     *
+     * @param string $principalUri
+     * @return array
+     * @throws Exception
+     */
+    public function getDeletedCalendarObjectsByPrincipal(string $principalUri): array {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.size', 'co.componenttype', 'co.classification', 'co.deleted_at'])
+            ->selectAlias('c.uri', 'calendaruri')
+            ->from('calendarobjects', 'co')
+            ->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+            ->andWhere($query->expr()->isNotNull('co.deleted_at'))
+            ->andWhere($query->expr()->isNull('c.deleted_at'));
+        $stmt = $query->executeQuery();
+
+        $result = [];
+        while ($row = $stmt->fetch()) {
+            $result[] = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag' => '"' . $row['etag'] . '"',
+                'calendarid' => $row['calendarid'],
+                'calendaruri' => $row['calendaruri'],
+                'size' => (int)$row['size'],
+                'component' => strtolower($row['componenttype']),
+                'classification' => (int)$row['classification'],
+                '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
+            ];
+        }
+        $stmt->closeCursor();
+
+        return $result;
+    }
+
+    /**
+     * Returns information from a single calendar object, based on it's object
+     * uri.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * The returned array must have the same keys as getCalendarObjects. The
+     * 'calendardata' object is required here though, while it's not required
+     * for getCalendarObjects.
+     *
+     * This method must return null if the object did not exist.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param int $calendarType
+     * @return array|null
+     */
+    public function getCalendarObject($calendarId, $objectUri, int $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'calendardata', 'componenttype', 'classification', 'deleted_at'])
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)));
+        $stmt = $query->executeQuery();
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+
+        if (!$row) {
+            return null;
+        }
+
+        return [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'lastmodified' => $row['lastmodified'],
+            'etag' => '"' . $row['etag'] . '"',
+            'calendarid' => $row['calendarid'],
+            'size' => (int)$row['size'],
+            'calendardata' => $this->readBlob($row['calendardata']),
+            'component' => strtolower($row['componenttype']),
+            'classification' => (int)$row['classification'],
+            '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => $row['deleted_at'] === null ? $row['deleted_at'] : (int) $row['deleted_at'],
+        ];
+    }
+
+    /**
+     * Returns a list of calendar objects.
+     *
+     * This method should work identical to getCalendarObject, but instead
+     * return all the calendar objects in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $calendarId
+     * @param string[] $uris
+     * @param int $calendarType
+     * @return array
+     */
+    public function getMultipleCalendarObjects($calendarId, array $uris, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
+        if (empty($uris)) {
+            return [];
+        }
+
+        $chunks = array_chunk($uris, 100);
+        $objects = [];
+
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'calendardata', 'componenttype', 'classification'])
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->in('uri', $query->createParameter('uri')))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
+            ->andWhere($query->expr()->isNull('deleted_at'));
+
+        foreach ($chunks as $uris) {
+            $query->setParameter('uri', $uris, IQueryBuilder::PARAM_STR_ARRAY);
+            $result = $query->executeQuery();
+
+            while ($row = $result->fetch()) {
+                $objects[] = [
+                    'id' => $row['id'],
+                    'uri' => $row['uri'],
+                    'lastmodified' => $row['lastmodified'],
+                    'etag' => '"' . $row['etag'] . '"',
+                    'calendarid' => $row['calendarid'],
+                    'size' => (int)$row['size'],
+                    'calendardata' => $this->readBlob($row['calendardata']),
+                    'component' => strtolower($row['componenttype']),
+                    'classification' => (int)$row['classification']
+                ];
+            }
+            $result->closeCursor();
+        }
+
+        return $objects;
+    }
+
+    /**
+     * Creates a new calendar object.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @param int $calendarType
+     * @return string
+     */
+    public function createCalendarObject($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        $extraData = $this->getDenormalizedData($calendarData);
+
+        // Try to detect duplicates
+        $qb = $this->db->getQueryBuilder();
+        $qb->select($qb->func()->count('*'))
+            ->from('calendarobjects')
+            ->where($qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)))
+            ->andWhere($qb->expr()->eq('uid', $qb->createNamedParameter($extraData['uid'])))
+            ->andWhere($qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType)))
+            ->andWhere($qb->expr()->isNull('deleted_at'));
+        $result = $qb->executeQuery();
+        $count = (int) $result->fetchOne();
+        $result->closeCursor();
+
+        if ($count !== 0) {
+            throw new BadRequest('Calendar object with uid already exists in this calendar collection.');
+        }
+        // For a more specific error message we also try to explicitly look up the UID but as a deleted entry
+        $qbDel = $this->db->getQueryBuilder();
+        $qbDel->select($qb->func()->count('*'))
+            ->from('calendarobjects')
+            ->where($qbDel->expr()->eq('calendarid', $qbDel->createNamedParameter($calendarId)))
+            ->andWhere($qbDel->expr()->eq('uid', $qbDel->createNamedParameter($extraData['uid'])))
+            ->andWhere($qbDel->expr()->eq('calendartype', $qbDel->createNamedParameter($calendarType)))
+            ->andWhere($qbDel->expr()->isNotNull('deleted_at'));
+        $result = $qbDel->executeQuery();
+        $count = (int) $result->fetchOne();
+        $result->closeCursor();
+        if ($count !== 0) {
+            throw new BadRequest('Deleted calendar object with uid already exists in this calendar collection.');
+        }
+
+        $query = $this->db->getQueryBuilder();
+        $query->insert('calendarobjects')
+            ->values([
+                'calendarid' => $query->createNamedParameter($calendarId),
+                'uri' => $query->createNamedParameter($objectUri),
+                'calendardata' => $query->createNamedParameter($calendarData, IQueryBuilder::PARAM_LOB),
+                'lastmodified' => $query->createNamedParameter(time()),
+                'etag' => $query->createNamedParameter($extraData['etag']),
+                'size' => $query->createNamedParameter($extraData['size']),
+                'componenttype' => $query->createNamedParameter($extraData['componentType']),
+                'firstoccurence' => $query->createNamedParameter($extraData['firstOccurence']),
+                'lastoccurence' => $query->createNamedParameter($extraData['lastOccurence']),
+                'classification' => $query->createNamedParameter($extraData['classification']),
+                'uid' => $query->createNamedParameter($extraData['uid']),
+                'calendartype' => $query->createNamedParameter($calendarType),
+            ])
+            ->executeStatement();
+
+        $this->updateProperties($calendarId, $objectUri, $calendarData, $calendarType);
+        $this->addChange($calendarId, $objectUri, 1, $calendarType);
+
+        $objectRow = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
+        assert($objectRow !== null);
+
+        if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
+            $calendarRow = $this->getCalendarById($calendarId);
+            $shares = $this->getShares($calendarId);
+
+            $this->dispatcher->dispatchTyped(new CalendarObjectCreatedEvent($calendarId, $calendarRow, $shares, $objectRow));
+        } else {
+            $subscriptionRow = $this->getSubscriptionById($calendarId);
+
+            $this->dispatcher->dispatchTyped(new CachedCalendarObjectCreatedEvent($calendarId, $subscriptionRow, [], $objectRow));
+        }
+
+        return '"' . $extraData['etag'] . '"';
+    }
+
+    /**
+     * Updates an existing calendarobject, based on it's uri.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @param int $calendarType
+     * @return string
+     */
+    public function updateCalendarObject($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        $extraData = $this->getDenormalizedData($calendarData);
+        $query = $this->db->getQueryBuilder();
+        $query->update('calendarobjects')
+                ->set('calendardata', $query->createNamedParameter($calendarData, IQueryBuilder::PARAM_LOB))
+                ->set('lastmodified', $query->createNamedParameter(time()))
+                ->set('etag', $query->createNamedParameter($extraData['etag']))
+                ->set('size', $query->createNamedParameter($extraData['size']))
+                ->set('componenttype', $query->createNamedParameter($extraData['componentType']))
+                ->set('firstoccurence', $query->createNamedParameter($extraData['firstOccurence']))
+                ->set('lastoccurence', $query->createNamedParameter($extraData['lastOccurence']))
+                ->set('classification', $query->createNamedParameter($extraData['classification']))
+                ->set('uid', $query->createNamedParameter($extraData['uid']))
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
+            ->executeStatement();
+
+        $this->updateProperties($calendarId, $objectUri, $calendarData, $calendarType);
+        $this->addChange($calendarId, $objectUri, 2, $calendarType);
+
+        $objectRow = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
+        if (is_array($objectRow)) {
+            if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
+                $calendarRow = $this->getCalendarById($calendarId);
+                $shares = $this->getShares($calendarId);
+
+                $this->dispatcher->dispatchTyped(new CalendarObjectUpdatedEvent($calendarId, $calendarRow, $shares, $objectRow));
+            } else {
+                $subscriptionRow = $this->getSubscriptionById($calendarId);
+
+                $this->dispatcher->dispatchTyped(new CachedCalendarObjectUpdatedEvent($calendarId, $subscriptionRow, [], $objectRow));
+            }
+        }
+
+        return '"' . $extraData['etag'] . '"';
+    }
+
+    /**
+     * Moves a calendar object from calendar to calendar.
+     *
+     * @param int $sourceCalendarId
+     * @param int $targetCalendarId
+     * @param int $objectId
+     * @param string $oldPrincipalUri
+     * @param string $newPrincipalUri
+     * @param int $calendarType
+     * @return bool
+     * @throws Exception
+     */
+    public function moveCalendarObject(int $sourceCalendarId, int $targetCalendarId, int $objectId, string $oldPrincipalUri, string $newPrincipalUri, int $calendarType = self::CALENDAR_TYPE_CALENDAR): bool {
+        $object = $this->getCalendarObjectById($oldPrincipalUri, $objectId);
+        if (empty($object)) {
+            return false;
+        }
+
+        $query = $this->db->getQueryBuilder();
+        $query->update('calendarobjects')
+            ->set('calendarid', $query->createNamedParameter($targetCalendarId, IQueryBuilder::PARAM_INT))
+            ->where($query->expr()->eq('id', $query->createNamedParameter($objectId, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT))
+            ->executeStatement();
+
+        $this->purgeProperties($sourceCalendarId, $objectId);
+        $this->updateProperties($targetCalendarId, $object['uri'], $object['calendardata'], $calendarType);
+
+        $this->addChange($sourceCalendarId, $object['uri'], 1, $calendarType);
+        $this->addChange($targetCalendarId, $object['uri'], 3, $calendarType);
+
+        $object = $this->getCalendarObjectById($newPrincipalUri, $objectId);
+        // Calendar Object wasn't found - possibly because it was deleted in the meantime by a different client
+        if (empty($object)) {
+            return false;
+        }
+
+        $targetCalendarRow = $this->getCalendarById($targetCalendarId);
+        // the calendar this event is being moved to does not exist any longer
+        if (empty($targetCalendarRow)) {
+            return false;
+        }
+
+        if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
+            $sourceShares = $this->getShares($sourceCalendarId);
+            $targetShares = $this->getShares($targetCalendarId);
+            $sourceCalendarRow = $this->getCalendarById($sourceCalendarId);
+            $this->dispatcher->dispatchTyped(new CalendarObjectMovedEvent($sourceCalendarId, $sourceCalendarRow, $targetCalendarId, $targetCalendarRow, $sourceShares, $targetShares, $object));
+        }
+        return true;
+    }
+
+
+    /**
+     * @param int $calendarObjectId
+     * @param int $classification
+     */
+    public function setClassification($calendarObjectId, $classification) {
+        if (!in_array($classification, [
+            self::CLASSIFICATION_PUBLIC, self::CLASSIFICATION_PRIVATE, self::CLASSIFICATION_CONFIDENTIAL
+        ])) {
+            throw new \InvalidArgumentException();
+        }
+        $query = $this->db->getQueryBuilder();
+        $query->update('calendarobjects')
+            ->set('classification', $query->createNamedParameter($classification))
+            ->where($query->expr()->eq('id', $query->createNamedParameter($calendarObjectId)))
+            ->executeStatement();
+    }
+
+    /**
+     * Deletes an existing calendar object.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param int $calendarType
+     * @param bool $forceDeletePermanently
+     * @return void
+     */
+    public function deleteCalendarObject($calendarId, $objectUri, $calendarType = self::CALENDAR_TYPE_CALENDAR, bool $forceDeletePermanently = false) {
+        $data = $this->getCalendarObject($calendarId, $objectUri, $calendarType);
+
+        if ($data === null) {
+            // Nothing to delete
+            return;
+        }
+
+        if ($forceDeletePermanently || $this->config->getAppValue(Application::APP_ID, RetentionService::RETENTION_CONFIG_KEY) === '0') {
+            $stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendarobjects` WHERE `calendarid` = ? AND `uri` = ? AND `calendartype` = ?');
+            $stmt->execute([$calendarId, $objectUri, $calendarType]);
+
+            $this->purgeProperties($calendarId, $data['id']);
+
+            if ($calendarType === self::CALENDAR_TYPE_CALENDAR) {
+                $calendarRow = $this->getCalendarById($calendarId);
+                $shares = $this->getShares($calendarId);
+
+                $this->dispatcher->dispatchTyped(new CalendarObjectDeletedEvent($calendarId, $calendarRow, $shares, $data));
+            } else {
+                $subscriptionRow = $this->getSubscriptionById($calendarId);
+
+                $this->dispatcher->dispatchTyped(new CachedCalendarObjectDeletedEvent($calendarId, $subscriptionRow, [], $data));
+            }
+        } else {
+            $pathInfo = pathinfo($data['uri']);
+            if (!empty($pathInfo['extension'])) {
+                // Append a suffix to "free" the old URI for recreation
+                $newUri = sprintf(
+                    "%s-deleted.%s",
+                    $pathInfo['filename'],
+                    $pathInfo['extension']
+                );
+            } else {
+                $newUri = sprintf(
+                    "%s-deleted",
+                    $pathInfo['filename']
+                );
+            }
+
+            // Try to detect conflicts before the DB does
+            // As unlikely as it seems, this can happen when the user imports, then deletes, imports and deletes again
+            $newObject = $this->getCalendarObject($calendarId, $newUri, $calendarType);
+            if ($newObject !== null) {
+                throw new Forbidden("A calendar object with URI $newUri already exists in calendar $calendarId, therefore this object can't be moved into the trashbin");
+            }
+
+            $qb = $this->db->getQueryBuilder();
+            $markObjectDeletedQuery = $qb->update('calendarobjects')
+                ->set('deleted_at', $qb->createNamedParameter(time(), IQueryBuilder::PARAM_INT))
+                ->set('uri', $qb->createNamedParameter($newUri))
+                ->where(
+                    $qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
+                    $qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT),
+                    $qb->expr()->eq('uri', $qb->createNamedParameter($objectUri))
+                );
+            $markObjectDeletedQuery->executeStatement();
+
+            $calendarData = $this->getCalendarById($calendarId);
+            if ($calendarData !== null) {
+                $this->dispatcher->dispatchTyped(
+                    new CalendarObjectMovedToTrashEvent(
+                        $calendarId,
+                        $calendarData,
+                        $this->getShares($calendarId),
+                        $data
+                    )
+                );
+            }
+        }
+
+        $this->addChange($calendarId, $objectUri, 3, $calendarType);
+    }
+
+    /**
+     * @param mixed $objectData
+     *
+     * @throws Forbidden
+     */
+    public function restoreCalendarObject(array $objectData): void {
+        $id = (int) $objectData['id'];
+        $restoreUri = str_replace("-deleted.ics", ".ics", $objectData['uri']);
+        $targetObject = $this->getCalendarObject(
+            $objectData['calendarid'],
+            $restoreUri
+        );
+        if ($targetObject !== null) {
+            throw new Forbidden("Can not restore calendar $id because a calendar object with the URI $restoreUri already exists");
+        }
+
+        $qb = $this->db->getQueryBuilder();
+        $update = $qb->update('calendarobjects')
+            ->set('uri', $qb->createNamedParameter($restoreUri))
+            ->set('deleted_at', $qb->createNamedParameter(null))
+            ->where($qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
+        $update->executeStatement();
+
+        // Make sure this change is tracked in the changes table
+        $qb2 = $this->db->getQueryBuilder();
+        $selectObject = $qb2->select('calendardata', 'uri', 'calendarid', 'calendartype')
+            ->selectAlias('componenttype', 'component')
+            ->from('calendarobjects')
+            ->where($qb2->expr()->eq('id', $qb2->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
+        $result = $selectObject->executeQuery();
+        $row = $result->fetch();
+        $result->closeCursor();
+        if ($row === false) {
+            // Welp, this should possibly not have happened, but let's ignore
+            return;
+        }
+        $this->addChange($row['calendarid'], $row['uri'], 1, (int) $row['calendartype']);
+
+        $calendarRow = $this->getCalendarById((int) $row['calendarid']);
+        if ($calendarRow === null) {
+            throw new RuntimeException('Calendar object data that was just written can\'t be read back. Check your database configuration.');
+        }
+        $this->dispatcher->dispatchTyped(
+            new CalendarObjectRestoredEvent(
+                (int) $objectData['calendarid'],
+                $calendarRow,
+                $this->getShares((int) $row['calendarid']),
+                $row
+            )
+        );
+    }
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre\CalDAV\CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
+     *
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
+     *
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly advised to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on either VEVENT or VTODO.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interpret all these filters can also simply
+     * be found in Sabre\CalDAV\CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * @param mixed $calendarId
+     * @param array $filters
+     * @param int $calendarType
+     * @return array
+     */
+    public function calendarQuery($calendarId, array $filters, $calendarType = self::CALENDAR_TYPE_CALENDAR):array {
+        $componentType = null;
+        $requirePostFilter = true;
+        $timeRange = null;
+
+        // if no filters were specified, we don't need to filter after a query
+        if (!$filters['prop-filters'] && !$filters['comp-filters']) {
+            $requirePostFilter = false;
+        }
+
+        // Figuring out if there's a component filter
+        if (count($filters['comp-filters']) > 0 && !$filters['comp-filters'][0]['is-not-defined']) {
+            $componentType = $filters['comp-filters'][0]['name'];
+
+            // Checking if we need post-filters
+            if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['time-range'] && !$filters['comp-filters'][0]['prop-filters']) {
+                $requirePostFilter = false;
+            }
+            // There was a time-range filter
+            if ($componentType === 'VEVENT' && isset($filters['comp-filters'][0]['time-range']) && is_array($filters['comp-filters'][0]['time-range'])) {
+                $timeRange = $filters['comp-filters'][0]['time-range'];
+
+                // If start time OR the end time is not specified, we can do a
+                // 100% accurate mysql query.
+                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
+                    $requirePostFilter = false;
+                }
+            }
+        }
+        $columns = ['uri'];
+        if ($requirePostFilter) {
+            $columns = ['uri', 'calendardata'];
+        }
+        $query = $this->db->getQueryBuilder();
+        $query->select($columns)
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)))
+            ->andWhere($query->expr()->isNull('deleted_at'));
+
+        if ($componentType) {
+            $query->andWhere($query->expr()->eq('componenttype', $query->createNamedParameter($componentType)));
+        }
+
+        if ($timeRange && $timeRange['start']) {
+            $query->andWhere($query->expr()->gt('lastoccurence', $query->createNamedParameter($timeRange['start']->getTimeStamp())));
+        }
+        if ($timeRange && $timeRange['end']) {
+            $query->andWhere($query->expr()->lt('firstoccurence', $query->createNamedParameter($timeRange['end']->getTimeStamp())));
+        }
+
+        $stmt = $query->executeQuery();
+
+        $result = [];
+        while ($row = $stmt->fetch()) {
+            if ($requirePostFilter) {
+                // validateFilterForObject will parse the calendar data
+                // catch parsing errors
+                try {
+                    $matches = $this->validateFilterForObject($row, $filters);
+                } catch (ParseException $ex) {
+                    $this->logger->error('Caught parsing exception for calendar data. This usually indicates invalid calendar data. calendar-id:'.$calendarId.' uri:'.$row['uri'], [
+                        'app' => 'dav',
+                        'exception' => $ex,
+                    ]);
+                    continue;
+                } catch (InvalidDataException $ex) {
+                    $this->logger->error('Caught invalid data exception for calendar data. This usually indicates invalid calendar data. calendar-id:'.$calendarId.' uri:'.$row['uri'], [
+                        'app' => 'dav',
+                        'exception' => $ex,
+                    ]);
+                    continue;
+                }
+
+                if (!$matches) {
+                    continue;
+                }
+            }
+            $result[] = $row['uri'];
+        }
+
+        return $result;
+    }
+
+    /**
+     * custom Nextcloud search extension for CalDAV
+     *
+     * TODO - this should optionally cover cached calendar objects as well
+     *
+     * @param string $principalUri
+     * @param array $filters
+     * @param integer|null $limit
+     * @param integer|null $offset
+     * @return array
+     */
+    public function calendarSearch($principalUri, array $filters, $limit = null, $offset = null) {
+        $calendars = $this->getCalendarsForUser($principalUri);
+        $ownCalendars = [];
+        $sharedCalendars = [];
+
+        $uriMapper = [];
+
+        foreach ($calendars as $calendar) {
+            if ($calendar['{http://owncloud.org/ns}owner-principal'] === $principalUri) {
+                $ownCalendars[] = $calendar['id'];
+            } else {
+                $sharedCalendars[] = $calendar['id'];
+            }
+            $uriMapper[$calendar['id']] = $calendar['uri'];
+        }
+        if (count($ownCalendars) === 0 && count($sharedCalendars) === 0) {
+            return [];
+        }
+
+        $query = $this->db->getQueryBuilder();
+        // Calendar id expressions
+        $calendarExpressions = [];
+        foreach ($ownCalendars as $id) {
+            $calendarExpressions[] = $query->expr()->andX(
+                $query->expr()->eq('c.calendarid',
+                    $query->createNamedParameter($id)),
+                $query->expr()->eq('c.calendartype',
+                        $query->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
+        }
+        foreach ($sharedCalendars as $id) {
+            $calendarExpressions[] = $query->expr()->andX(
+                $query->expr()->eq('c.calendarid',
+                    $query->createNamedParameter($id)),
+                $query->expr()->eq('c.classification',
+                    $query->createNamedParameter(self::CLASSIFICATION_PUBLIC)),
+                $query->expr()->eq('c.calendartype',
+                    $query->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
+        }
+
+        if (count($calendarExpressions) === 1) {
+            $calExpr = $calendarExpressions[0];
+        } else {
+            $calExpr = call_user_func_array([$query->expr(), 'orX'], $calendarExpressions);
+        }
+
+        // Component expressions
+        $compExpressions = [];
+        foreach ($filters['comps'] as $comp) {
+            $compExpressions[] = $query->expr()
+                ->eq('c.componenttype', $query->createNamedParameter($comp));
+        }
+
+        if (count($compExpressions) === 1) {
+            $compExpr = $compExpressions[0];
+        } else {
+            $compExpr = call_user_func_array([$query->expr(), 'orX'], $compExpressions);
+        }
+
+        if (!isset($filters['props'])) {
+            $filters['props'] = [];
+        }
+        if (!isset($filters['params'])) {
+            $filters['params'] = [];
+        }
+
+        $propParamExpressions = [];
+        foreach ($filters['props'] as $prop) {
+            $propParamExpressions[] = $query->expr()->andX(
+                $query->expr()->eq('i.name', $query->createNamedParameter($prop)),
+                $query->expr()->isNull('i.parameter')
+            );
+        }
+        foreach ($filters['params'] as $param) {
+            $propParamExpressions[] = $query->expr()->andX(
+                $query->expr()->eq('i.name', $query->createNamedParameter($param['property'])),
+                $query->expr()->eq('i.parameter', $query->createNamedParameter($param['parameter']))
+            );
+        }
+
+        if (count($propParamExpressions) === 1) {
+            $propParamExpr = $propParamExpressions[0];
+        } else {
+            $propParamExpr = call_user_func_array([$query->expr(), 'orX'], $propParamExpressions);
+        }
+
+        $query->select(['c.calendarid', 'c.uri'])
+            ->from($this->dbObjectPropertiesTable, 'i')
+            ->join('i', 'calendarobjects', 'c', $query->expr()->eq('i.objectid', 'c.id'))
+            ->where($calExpr)
+            ->andWhere($compExpr)
+            ->andWhere($propParamExpr)
+            ->andWhere($query->expr()->iLike('i.value',
+                $query->createNamedParameter('%'.$this->db->escapeLikeParameter($filters['search-term']).'%')))
+            ->andWhere($query->expr()->isNull('deleted_at'));
+
+        if ($offset) {
+            $query->setFirstResult($offset);
+        }
+        if ($limit) {
+            $query->setMaxResults($limit);
+        }
+
+        $stmt = $query->executeQuery();
+
+        $result = [];
+        while ($row = $stmt->fetch()) {
+            $path = $uriMapper[$row['calendarid']] . '/' . $row['uri'];
+            if (!in_array($path, $result)) {
+                $result[] = $path;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * used for Nextcloud's calendar API
+     *
+     * @param array $calendarInfo
+     * @param string $pattern
+     * @param array $searchProperties
+     * @param array $options
+     * @param integer|null $limit
+     * @param integer|null $offset
+     *
+     * @return array
+     */
+    public function search(array $calendarInfo, $pattern, array $searchProperties,
+                            array $options, $limit, $offset) {
+        $outerQuery = $this->db->getQueryBuilder();
+        $innerQuery = $this->db->getQueryBuilder();
+
+        $innerQuery->selectDistinct('op.objectid')
+            ->from($this->dbObjectPropertiesTable, 'op')
+            ->andWhere($innerQuery->expr()->eq('op.calendarid',
+                $outerQuery->createNamedParameter($calendarInfo['id'])))
+            ->andWhere($innerQuery->expr()->eq('op.calendartype',
+                $outerQuery->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
+
+        // only return public items for shared calendars for now
+        if (isset($calendarInfo['{http://owncloud.org/ns}owner-principal']) === false || $calendarInfo['principaluri'] !== $calendarInfo['{http://owncloud.org/ns}owner-principal']) {
+            $innerQuery->andWhere($innerQuery->expr()->eq('c.classification',
+                $outerQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
+        }
+
+        if (!empty($searchProperties)) {
+            $or = $innerQuery->expr()->orX();
+            foreach ($searchProperties as $searchProperty) {
+                $or->add($innerQuery->expr()->eq('op.name',
+                    $outerQuery->createNamedParameter($searchProperty)));
+            }
+            $innerQuery->andWhere($or);
+        }
+
+        if ($pattern !== '') {
+            $innerQuery->andWhere($innerQuery->expr()->iLike('op.value',
+                $outerQuery->createNamedParameter('%' .
+                    $this->db->escapeLikeParameter($pattern) . '%')));
+        }
+
+        $outerQuery->select('c.id', 'c.calendardata', 'c.componenttype', 'c.uid', 'c.uri')
+            ->from('calendarobjects', 'c')
+            ->where($outerQuery->expr()->isNull('deleted_at'));
+
+        if (isset($options['timerange'])) {
+            if (isset($options['timerange']['start']) && $options['timerange']['start'] instanceof DateTimeInterface) {
+                $outerQuery->andWhere($outerQuery->expr()->gt('lastoccurence',
+                    $outerQuery->createNamedParameter($options['timerange']['start']->getTimeStamp())));
+            }
+            if (isset($options['timerange']['end']) && $options['timerange']['end'] instanceof DateTimeInterface) {
+                $outerQuery->andWhere($outerQuery->expr()->lt('firstoccurence',
+                    $outerQuery->createNamedParameter($options['timerange']['end']->getTimeStamp())));
+            }
+        }
+
+        if(isset($options['uid'])) {
+            $outerQuery->andWhere($outerQuery->expr()->eq('uid', $outerQuery->createNamedParameter($options['uid'])));
+        }
+
+        if (!empty($options['types'])) {
+            $or = $outerQuery->expr()->orX();
+            foreach ($options['types'] as $type) {
+                $or->add($outerQuery->expr()->eq('componenttype',
+                    $outerQuery->createNamedParameter($type)));
+            }
+            $outerQuery->andWhere($or);
+        }
+
+        $outerQuery->andWhere($outerQuery->expr()->in('c.id', $outerQuery->createFunction($innerQuery->getSQL())));
+
+        if ($offset) {
+            $outerQuery->setFirstResult($offset);
+        }
+        if ($limit) {
+            $outerQuery->setMaxResults($limit);
+        }
+
+        $result = $outerQuery->executeQuery();
+        $calendarObjects = array_filter($result->fetchAll(), function (array $row) use ($options) {
+            $start = $options['timerange']['start'] ?? null;
+            $end = $options['timerange']['end'] ?? null;
+
+            if ($start === null || !($start instanceof DateTimeInterface) || $end === null || !($end instanceof DateTimeInterface)) {
+                // No filter required
+                return true;
+            }
+
+            $isValid = $this->validateFilterForObject($row, [
+                'name' => 'VCALENDAR',
+                'comp-filters' => [
+                    [
+                        'name' => 'VEVENT',
+                        'comp-filters' => [],
+                        'prop-filters' => [],
+                        'is-not-defined' => false,
+                        'time-range' => [
+                            'start' => $start,
+                            'end' => $end,
+                        ],
+                    ],
+                ],
+                'prop-filters' => [],
+                'is-not-defined' => false,
+                'time-range' => null,
+            ]);
+            if (is_resource($row['calendardata'])) {
+                // Put the stream back to the beginning so it can be read another time
+                rewind($row['calendardata']);
+            }
+            return $isValid;
+        });
+        $result->closeCursor();
+
+        return array_map(function ($o) {
+            $calendarData = Reader::read($o['calendardata']);
+            $comps = $calendarData->getComponents();
+            $objects = [];
+            $timezones = [];
+            foreach ($comps as $comp) {
+                if ($comp instanceof VTimeZone) {
+                    $timezones[] = $comp;
+                } else {
+                    $objects[] = $comp;
+                }
+            }
+
+            return [
+                'id' => $o['id'],
+                'type' => $o['componenttype'],
+                'uid' => $o['uid'],
+                'uri' => $o['uri'],
+                'objects' => array_map(function ($c) {
+                    return $this->transformSearchData($c);
+                }, $objects),
+                'timezones' => array_map(function ($c) {
+                    return $this->transformSearchData($c);
+                }, $timezones),
+            ];
+        }, $calendarObjects);
+    }
+
+    /**
+     * @param Component $comp
+     * @return array
+     */
+    private function transformSearchData(Component $comp) {
+        $data = [];
+        /** @var Component[] $subComponents */
+        $subComponents = $comp->getComponents();
+        /** @var Property[] $properties */
+        $properties = array_filter($comp->children(), function ($c) {
+            return $c instanceof Property;
+        });
+        $validationRules = $comp->getValidationRules();
+
+        foreach ($subComponents as $subComponent) {
+            $name = $subComponent->name;
+            if (!isset($data[$name])) {
+                $data[$name] = [];
+            }
+            $data[$name][] = $this->transformSearchData($subComponent);
+        }
+
+        foreach ($properties as $property) {
+            $name = $property->name;
+            if (!isset($validationRules[$name])) {
+                $validationRules[$name] = '*';
+            }
+
+            $rule = $validationRules[$property->name];
+            if ($rule === '+' || $rule === '*') { // multiple
+                if (!isset($data[$name])) {
+                    $data[$name] = [];
+                }
+
+                $data[$name][] = $this->transformSearchProperty($property);
+            } else { // once
+                $data[$name] = $this->transformSearchProperty($property);
+            }
+        }
+
+        return $data;
+    }
+
+    /**
+     * @param Property $prop
+     * @return array
+     */
+    private function transformSearchProperty(Property $prop) {
+        // No need to check Date, as it extends DateTime
+        if ($prop instanceof Property\ICalendar\DateTime) {
+            $value = $prop->getDateTime();
+        } else {
+            $value = $prop->getValue();
+        }
+
+        return [
+            $value,
+            $prop->parameters()
+        ];
+    }
+
+    /**
+     * @param string $principalUri
+     * @param string $pattern
+     * @param array $componentTypes
+     * @param array $searchProperties
+     * @param array $searchParameters
+     * @param array $options
+     * @return array
+     */
+    public function searchPrincipalUri(string $principalUri,
+                                        string $pattern,
+                                        array $componentTypes,
+                                        array $searchProperties,
+                                        array $searchParameters,
+                                        array $options = []): array {
+        $escapePattern = !\array_key_exists('escape_like_param', $options) || $options['escape_like_param'] !== false;
+
+        $calendarObjectIdQuery = $this->db->getQueryBuilder();
+        $calendarOr = $calendarObjectIdQuery->expr()->orX();
+        $searchOr = $calendarObjectIdQuery->expr()->orX();
+
+        // Fetch calendars and subscription
+        $calendars = $this->getCalendarsForUser($principalUri);
+        $subscriptions = $this->getSubscriptionsForUser($principalUri);
+        foreach ($calendars as $calendar) {
+            $calendarAnd = $calendarObjectIdQuery->expr()->andX();
+            $calendarAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendarid', $calendarObjectIdQuery->createNamedParameter((int)$calendar['id'])));
+            $calendarAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendartype', $calendarObjectIdQuery->createNamedParameter(self::CALENDAR_TYPE_CALENDAR)));
+
+            // If it's shared, limit search to public events
+            if (isset($calendar['{http://owncloud.org/ns}owner-principal'])
+                && $calendar['principaluri'] !== $calendar['{http://owncloud.org/ns}owner-principal']) {
+                $calendarAnd->add($calendarObjectIdQuery->expr()->eq('co.classification', $calendarObjectIdQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
+            }
+
+            $calendarOr->add($calendarAnd);
+        }
+        foreach ($subscriptions as $subscription) {
+            $subscriptionAnd = $calendarObjectIdQuery->expr()->andX();
+            $subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendarid', $calendarObjectIdQuery->createNamedParameter((int)$subscription['id'])));
+            $subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('cob.calendartype', $calendarObjectIdQuery->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)));
+
+            // If it's shared, limit search to public events
+            if (isset($subscription['{http://owncloud.org/ns}owner-principal'])
+                && $subscription['principaluri'] !== $subscription['{http://owncloud.org/ns}owner-principal']) {
+                $subscriptionAnd->add($calendarObjectIdQuery->expr()->eq('co.classification', $calendarObjectIdQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
+            }
+
+            $calendarOr->add($subscriptionAnd);
+        }
+
+        foreach ($searchProperties as $property) {
+            $propertyAnd = $calendarObjectIdQuery->expr()->andX();
+            $propertyAnd->add($calendarObjectIdQuery->expr()->eq('cob.name', $calendarObjectIdQuery->createNamedParameter($property, IQueryBuilder::PARAM_STR)));
+            $propertyAnd->add($calendarObjectIdQuery->expr()->isNull('cob.parameter'));
+
+            $searchOr->add($propertyAnd);
+        }
+        foreach ($searchParameters as $property => $parameter) {
+            $parameterAnd = $calendarObjectIdQuery->expr()->andX();
+            $parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.name', $calendarObjectIdQuery->createNamedParameter($property, IQueryBuilder::PARAM_STR)));
+            $parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.parameter', $calendarObjectIdQuery->createNamedParameter($parameter, IQueryBuilder::PARAM_STR_ARRAY)));
+
+            $searchOr->add($parameterAnd);
+        }
+
+        if ($calendarOr->count() === 0) {
+            return [];
+        }
+        if ($searchOr->count() === 0) {
+            return [];
+        }
+
+        $calendarObjectIdQuery->selectDistinct('cob.objectid')
+            ->from($this->dbObjectPropertiesTable, 'cob')
+            ->leftJoin('cob', 'calendarobjects', 'co', $calendarObjectIdQuery->expr()->eq('co.id', 'cob.objectid'))
+            ->andWhere($calendarObjectIdQuery->expr()->in('co.componenttype', $calendarObjectIdQuery->createNamedParameter($componentTypes, IQueryBuilder::PARAM_STR_ARRAY)))
+            ->andWhere($calendarOr)
+            ->andWhere($searchOr)
+            ->andWhere($calendarObjectIdQuery->expr()->isNull('deleted_at'));
+
+        if ('' !== $pattern) {
+            if (!$escapePattern) {
+                $calendarObjectIdQuery->andWhere($calendarObjectIdQuery->expr()->ilike('cob.value', $calendarObjectIdQuery->createNamedParameter($pattern)));
+            } else {
+                $calendarObjectIdQuery->andWhere($calendarObjectIdQuery->expr()->ilike('cob.value', $calendarObjectIdQuery->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
+            }
+        }
+
+        if (isset($options['limit'])) {
+            $calendarObjectIdQuery->setMaxResults($options['limit']);
+        }
+        if (isset($options['offset'])) {
+            $calendarObjectIdQuery->setFirstResult($options['offset']);
+        }
+
+        $result = $calendarObjectIdQuery->executeQuery();
+        $matches = $result->fetchAll();
+        $result->closeCursor();
+        $matches = array_map(static function (array $match):int {
+            return (int) $match['objectid'];
+        }, $matches);
+
+        $query = $this->db->getQueryBuilder();
+        $query->select('calendardata', 'uri', 'calendarid', 'calendartype')
+            ->from('calendarobjects')
+            ->where($query->expr()->in('id', $query->createNamedParameter($matches, IQueryBuilder::PARAM_INT_ARRAY)));
+
+        $result = $query->executeQuery();
+        $calendarObjects = $result->fetchAll();
+        $result->closeCursor();
+
+        return array_map(function (array $array): array {
+            $array['calendarid'] = (int)$array['calendarid'];
+            $array['calendartype'] = (int)$array['calendartype'];
+            $array['calendardata'] = $this->readBlob($array['calendardata']);
+
+            return $array;
+        }, $calendarObjects);
+    }
+
+    /**
+     * Searches through all of a users calendars and calendar objects to find
+     * an object with a specific UID.
+     *
+     * This method should return the path to this object, relative to the
+     * calendar home, so this path usually only contains two parts:
+     *
+     * calendarpath/objectpath.ics
+     *
+     * If the uid is not found, return null.
+     *
+     * This method should only consider * objects that the principal owns, so
+     * any calendars owned by other principals that also appear in this
+     * collection should be ignored.
+     *
+     * @param string $principalUri
+     * @param string $uid
+     * @return string|null
+     */
+    public function getCalendarObjectByUID($principalUri, $uid) {
+        $query = $this->db->getQueryBuilder();
+        $query->selectAlias('c.uri', 'calendaruri')->selectAlias('co.uri', 'objecturi')
+            ->from('calendarobjects', 'co')
+            ->leftJoin('co', 'calendars', 'c', $query->expr()->eq('co.calendarid', 'c.id'))
+            ->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
+            ->andWhere($query->expr()->eq('co.uid', $query->createNamedParameter($uid)))
+            ->andWhere($query->expr()->isNull('co.deleted_at'));
+        $stmt = $query->executeQuery();
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+        if ($row) {
+            return $row['calendaruri'] . '/' . $row['objecturi'];
+        }
+
+        return null;
+    }
+
+    public function getCalendarObjectById(string $principalUri, int $id): ?array {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.size', 'co.calendardata', 'co.componenttype', 'co.classification', 'co.deleted_at'])
+            ->selectAlias('c.uri', 'calendaruri')
+            ->from('calendarobjects', 'co')
+            ->join('co', 'calendars', 'c', $query->expr()->eq('c.id', 'co.calendarid', IQueryBuilder::PARAM_INT))
+            ->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
+            ->andWhere($query->expr()->eq('co.id', $query->createNamedParameter($id, IQueryBuilder::PARAM_INT), IQueryBuilder::PARAM_INT));
+        $stmt = $query->executeQuery();
+        $row = $stmt->fetch();
+        $stmt->closeCursor();
+
+        if (!$row) {
+            return null;
+        }
+
+        return [
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'lastmodified' => $row['lastmodified'],
+            'etag' => '"' . $row['etag'] . '"',
+            'calendarid' => $row['calendarid'],
+            'calendaruri' => $row['calendaruri'],
+            'size' => (int)$row['size'],
+            'calendardata' => $this->readBlob($row['calendardata']),
+            'component' => strtolower($row['componenttype']),
+            'classification' => (int)$row['classification'],
+            'deleted_at' => isset($row['deleted_at']) ? ((int) $row['deleted_at']) : null,
+        ];
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified calendar.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * );
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
+     * property This is * needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $calendarId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int|null $limit
+     * @param int $calendarType
+     * @return array
+     */
+    public function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        // Current synctoken
+        $qb = $this->db->getQueryBuilder();
+        $qb->select('synctoken')
+            ->from('calendars')
+            ->where(
+                $qb->expr()->eq('id', $qb->createNamedParameter($calendarId))
+            );
+        $stmt = $qb->executeQuery();
+        $currentToken = $stmt->fetchOne();
+
+        if ($currentToken === false) {
+            return null;
+        }
+
+        $result = [
+            'syncToken' => $currentToken,
+            'added' => [],
+            'modified' => [],
+            'deleted' => [],
+        ];
+
+        if ($syncToken) {
+            $qb = $this->db->getQueryBuilder();
+
+            $qb->select('uri', 'operation')
+                ->from('calendarchanges')
+                ->where(
+                    $qb->expr()->andX(
+                        $qb->expr()->gte('synctoken', $qb->createNamedParameter($syncToken)),
+                        $qb->expr()->lt('synctoken', $qb->createNamedParameter($currentToken)),
+                        $qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
+                        $qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType))
+                    )
+                )->orderBy('synctoken');
+            if (is_int($limit) && $limit > 0) {
+                $qb->setMaxResults($limit);
+            }
+
+            // Fetching all changes
+            $stmt = $qb->executeQuery();
+            $changes = [];
+
+            // This loop ensures that any duplicates are overwritten, only the
+            // last change on a node is relevant.
+            while ($row = $stmt->fetch()) {
+                $changes[$row['uri']] = $row['operation'];
+            }
+            $stmt->closeCursor();
+
+            foreach ($changes as $uri => $operation) {
+                switch ($operation) {
+                    case 1:
+                        $result['added'][] = $uri;
+                        break;
+                    case 2:
+                        $result['modified'][] = $uri;
+                        break;
+                    case 3:
+                        $result['deleted'][] = $uri;
+                        break;
+                }
+            }
+        } else {
+            // No synctoken supplied, this is the initial sync.
+            $qb = $this->db->getQueryBuilder();
+            $qb->select('uri')
+                ->from('calendarobjects')
+                ->where(
+                    $qb->expr()->andX(
+                        $qb->expr()->eq('calendarid', $qb->createNamedParameter($calendarId)),
+                        $qb->expr()->eq('calendartype', $qb->createNamedParameter($calendarType))
+                    )
+                );
+            $stmt = $qb->executeQuery();
+            $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+            $stmt->closeCursor();
+        }
+        return $result;
+    }
+
+    /**
+     * Returns a list of subscriptions for a principal.
+     *
+     * Every subscription is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    subscription. This can be the same as the uri or a database key.
+     *  * uri. This is just the 'base uri' or 'filename' of the subscription.
+     *  * principaluri. The owner of the subscription. Almost always the same as
+     *    principalUri passed to this method.
+     *
+     * Furthermore, all the subscription info must be returned too:
+     *
+     * 1. {DAV:}displayname
+     * 2. {http://apple.com/ns/ical/}refreshrate
+     * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
+     *    should not be stripped).
+     * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
+     *    should not be stripped).
+     * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
+     *    attachments should not be stripped).
+     * 6. {http://calendarserver.org/ns/}source (Must be a
+     *     Sabre\DAV\Property\Href).
+     * 7. {http://apple.com/ns/ical/}calendar-color
+     * 8. {http://apple.com/ns/ical/}calendar-order
+     * 9. {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     *    (should just be an instance of
+     *    Sabre\CalDAV\Property\SupportedCalendarComponentSet, with a bunch of
+     *    default components).
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    public function getSubscriptionsForUser($principalUri) {
+        $fields = array_column($this->subscriptionPropertyMap, 0);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'source';
+        $fields[] = 'principaluri';
+        $fields[] = 'lastmodified';
+        $fields[] = 'synctoken';
+
+        $query = $this->db->getQueryBuilder();
+        $query->select($fields)
+            ->from('calendarsubscriptions')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+            ->orderBy('calendarorder', 'asc');
+        $stmt = $query->executeQuery();
+
+        $subscriptions = [];
+        while ($row = $stmt->fetch()) {
+            $subscription = [
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'principaluri' => $row['principaluri'],
+                'source' => $row['source'],
+                'lastmodified' => $row['lastmodified'],
+
+                '{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
+                '{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+            ];
+
+            $subscriptions[] = $this->rowToSubscription($row, $subscription);
+        }
+
+        return $subscriptions;
+    }
+
+    /**
+     * Creates a new subscription for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used to reference
+     * this subscription in other methods, such as updateSubscription.
+     *
+     * @param string $principalUri
+     * @param string $uri
+     * @param array $properties
+     * @return mixed
+     */
+    public function createSubscription($principalUri, $uri, array $properties) {
+        if (!isset($properties['{http://calendarserver.org/ns/}source'])) {
+            throw new Forbidden('The {http://calendarserver.org/ns/}source property is required when creating subscriptions');
+        }
+
+        $values = [
+            'principaluri' => $principalUri,
+            'uri' => $uri,
+            'source' => $properties['{http://calendarserver.org/ns/}source']->getHref(),
+            'lastmodified' => time(),
+        ];
+
+        $propertiesBoolean = ['striptodos', 'stripalarms', 'stripattachments'];
+
+        foreach ($this->subscriptionPropertyMap as $xmlName => [$dbName, $type]) {
+            if (array_key_exists($xmlName, $properties)) {
+                $values[$dbName] = $properties[$xmlName];
+                if (in_array($dbName, $propertiesBoolean)) {
+                    $values[$dbName] = true;
+                }
+            }
+        }
+
+        [$subscriptionId, $subscriptionRow] = $this->atomic(function() use ($values) {
+            $valuesToInsert = [];
+            $query = $this->db->getQueryBuilder();
+            foreach (array_keys($values) as $name) {
+                $valuesToInsert[$name] = $query->createNamedParameter($values[$name]);
+            }
+            $query->insert('calendarsubscriptions')
+                ->values($valuesToInsert)
+                ->executeStatement();
+
+            $subscriptionId = $query->getLastInsertId();
+
+            $subscriptionRow = $this->getSubscriptionById($subscriptionId);
+            return [$subscriptionId, $subscriptionRow];
+        }, $this->db);
+
+        $this->dispatcher->dispatchTyped(new SubscriptionCreatedEvent($subscriptionId, $subscriptionRow));
+
+        return $subscriptionId;
+    }
+
+    /**
+     * Updates a subscription
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documentation for more info and examples.
+     *
+     * @param mixed $subscriptionId
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    public function updateSubscription($subscriptionId, PropPatch $propPatch) {
+        $supportedProperties = array_keys($this->subscriptionPropertyMap);
+        $supportedProperties[] = '{http://calendarserver.org/ns/}source';
+
+        $propPatch->handle($supportedProperties, function ($mutations) use ($subscriptionId) {
+            $newValues = [];
+
+            foreach ($mutations as $propertyName => $propertyValue) {
+                if ($propertyName === '{http://calendarserver.org/ns/}source') {
+                    $newValues['source'] = $propertyValue->getHref();
+                } else {
+                    $fieldName = $this->subscriptionPropertyMap[$propertyName][0];
+                    $newValues[$fieldName] = $propertyValue;
+                }
+            }
+
+            $query = $this->db->getQueryBuilder();
+            $query->update('calendarsubscriptions')
+                ->set('lastmodified', $query->createNamedParameter(time()));
+            foreach ($newValues as $fieldName => $value) {
+                $query->set($fieldName, $query->createNamedParameter($value));
+            }
+            $query->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
+                ->executeStatement();
+
+            $subscriptionRow = $this->getSubscriptionById($subscriptionId);
+            $this->dispatcher->dispatchTyped(new SubscriptionUpdatedEvent((int)$subscriptionId, $subscriptionRow, [], $mutations));
+
+            return true;
+        });
+    }
+
+    /**
+     * Deletes a subscription.
+     *
+     * @param mixed $subscriptionId
+     * @return void
+     */
+    public function deleteSubscription($subscriptionId) {
+        $subscriptionRow = $this->getSubscriptionById($subscriptionId);
+
+        $query = $this->db->getQueryBuilder();
+        $query->delete('calendarsubscriptions')
+            ->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
+            ->executeStatement();
+
+        $query = $this->db->getQueryBuilder();
+        $query->delete('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        $query->delete('calendarchanges')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        $query->delete($this->dbObjectPropertiesTable)
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        if ($subscriptionRow) {
+            $this->dispatcher->dispatchTyped(new SubscriptionDeletedEvent((int)$subscriptionId, $subscriptionRow, []));
+        }
+    }
+
+    /**
+     * Returns a single scheduling object for the inbox collection.
+     *
+     * The returned array should contain the following elements:
+     *   * uri - A unique basename for the object. This will be used to
+     *           construct a full uri.
+     *   * calendardata - The iCalendar object
+     *   * lastmodified - The last modification date. Can be an int for a unix
+     *                    timestamp, or a PHP DateTime object.
+     *   * etag - A unique token that must change if the object changed.
+     *   * size - The size of the object, in bytes.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return array
+     */
+    public function getSchedulingObject($principalUri, $objectUri) {
+        $query = $this->db->getQueryBuilder();
+        $stmt = $query->select(['uri', 'calendardata', 'lastmodified', 'etag', 'size'])
+            ->from('schedulingobjects')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
+            ->executeQuery();
+
+        $row = $stmt->fetch();
+
+        if (!$row) {
+            return null;
+        }
+
+        return [
+            'uri' => $row['uri'],
+            'calendardata' => $row['calendardata'],
+            'lastmodified' => $row['lastmodified'],
+            'etag' => '"' . $row['etag'] . '"',
+            'size' => (int)$row['size'],
+        ];
+    }
+
+    /**
+     * Returns all scheduling objects for the inbox collection.
+     *
+     * These objects should be returned as an array. Every item in the array
+     * should follow the same structure as returned from getSchedulingObject.
+     *
+     * The main difference is that 'calendardata' is optional.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    public function getSchedulingObjects($principalUri) {
+        $query = $this->db->getQueryBuilder();
+        $stmt = $query->select(['uri', 'calendardata', 'lastmodified', 'etag', 'size'])
+                ->from('schedulingobjects')
+                ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+                ->executeQuery();
+
+        $result = [];
+        foreach ($stmt->fetchAll() as $row) {
+            $result[] = [
+                'calendardata' => $row['calendardata'],
+                'uri' => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag' => '"' . $row['etag'] . '"',
+                'size' => (int)$row['size'],
+            ];
+        }
+        $stmt->closeCursor();
+
+        return $result;
+    }
+
+    /**
+     * Deletes a scheduling object from the inbox collection.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return void
+     */
+    public function deleteSchedulingObject($principalUri, $objectUri) {
+        $query = $this->db->getQueryBuilder();
+        $query->delete('schedulingobjects')
+                ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
+                ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($objectUri)))
+                ->executeStatement();
+    }
+
+    /**
+     * Creates a new scheduling object. This should land in a users' inbox.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @param string $objectData
+     * @return void
+     */
+    public function createSchedulingObject($principalUri, $objectUri, $objectData) {
+        $query = $this->db->getQueryBuilder();
+        $query->insert('schedulingobjects')
+            ->values([
+                'principaluri' => $query->createNamedParameter($principalUri),
+                'calendardata' => $query->createNamedParameter($objectData, IQueryBuilder::PARAM_LOB),
+                'uri' => $query->createNamedParameter($objectUri),
+                'lastmodified' => $query->createNamedParameter(time()),
+                'etag' => $query->createNamedParameter(md5($objectData)),
+                'size' => $query->createNamedParameter(strlen($objectData))
+            ])
+            ->executeStatement();
+    }
+
+    /**
+     * Adds a change record to the calendarchanges table.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param int $operation 1 = add, 2 = modify, 3 = delete.
+     * @param int $calendarType
+     * @return void
+     */
+    protected function addChange($calendarId, $objectUri, $operation, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        $table = $calendarType === self::CALENDAR_TYPE_CALENDAR ? 'calendars': 'calendarsubscriptions';
+
+        $query = $this->db->getQueryBuilder();
+        $query->select('synctoken')
+            ->from($table)
+            ->where($query->expr()->eq('id', $query->createNamedParameter($calendarId)));
+        $result = $query->executeQuery();
+        $syncToken = (int)$result->fetchOne();
+        $result->closeCursor();
+
+        $query = $this->db->getQueryBuilder();
+        $query->insert('calendarchanges')
+            ->values([
+                'uri' => $query->createNamedParameter($objectUri),
+                'synctoken' => $query->createNamedParameter($syncToken),
+                'calendarid' => $query->createNamedParameter($calendarId),
+                'operation' => $query->createNamedParameter($operation),
+                'calendartype' => $query->createNamedParameter($calendarType),
+            ])
+            ->executeStatement();
+
+        $stmt = $this->db->prepare("UPDATE `*PREFIX*$table` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?");
+        $stmt->execute([
+            $calendarId
+        ]);
+    }
+
+    /**
+     * Parses some information from calendar objects, used for optimized
+     * calendar-queries.
+     *
+     * Returns an array with the following keys:
+     *   * etag - An md5 checksum of the object without the quotes.
+     *   * size - Size of the object in bytes
+     *   * componentType - VEVENT, VTODO or VJOURNAL
+     *   * firstOccurence
+     *   * lastOccurence
+     *   * uid - value of the UID property
+     *
+     * @param string $calendarData
+     * @return array
+     */
+    public function getDenormalizedData($calendarData) {
+        $vObject = Reader::read($calendarData);
+        $vEvents = [];
+        $componentType = null;
+        $component = null;
+        $firstOccurrence = null;
+        $lastOccurrence = null;
+        $uid = null;
+        $classification = self::CLASSIFICATION_PUBLIC;
+        $hasDTSTART = false;
+        foreach ($vObject->getComponents() as $component) {
+            if ($component->name !== 'VTIMEZONE') {
+                // Finding all VEVENTs, and track them
+                if ($component->name === 'VEVENT') {
+                    array_push($vEvents, $component);
+                    if ($component->DTSTART) {
+                        $hasDTSTART = true;
+                    }
+                }
+                // Track first component type and uid
+                if ($uid === null) {
+                    $componentType = $component->name;
+                    $uid = (string)$component->UID;
+                }
+            }
+        }
+        if (!$componentType) {
+            throw new BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
+        }
+
+        if ($hasDTSTART) {
+            $component = $vEvents[0];
+
+            // Finding the last occurrence is a bit harder
+            if (!isset($component->RRULE) && count($vEvents) === 1) {
+                $firstOccurrence = $component->DTSTART->getDateTime()->getTimeStamp();
+                if (isset($component->DTEND)) {
+                    $lastOccurrence = $component->DTEND->getDateTime()->getTimeStamp();
+                } elseif (isset($component->DURATION)) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate->add(DateTimeParser::parse($component->DURATION->getValue()));
+                    $lastOccurrence = $endDate->getTimeStamp();
+                } elseif (!$component->DTSTART->hasTime()) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate->modify('+1 day');
+                    $lastOccurrence = $endDate->getTimeStamp();
+                } else {
+                    $lastOccurrence = $firstOccurrence;
+                }
+            } else {
+                $it = new EventIterator($vEvents);
+                $maxDate = new DateTime(self::MAX_DATE);
+                $firstOccurrence = $it->getDtStart()->getTimestamp();
+                if ($it->isInfinite()) {
+                    $lastOccurrence = $maxDate->getTimestamp();
+                } else {
+                    $end = $it->getDtEnd();
+                    while ($it->valid() && $end < $maxDate) {
+                        $end = $it->getDtEnd();
+                        $it->next();
+                    }
+                    $lastOccurrence = $end->getTimestamp();
+                }
+            }
+        }
+
+        if ($component->CLASS) {
+            $classification = CalDavBackend::CLASSIFICATION_PRIVATE;
+            switch ($component->CLASS->getValue()) {
+                case 'PUBLIC':
+                    $classification = CalDavBackend::CLASSIFICATION_PUBLIC;
+                    break;
+                case 'CONFIDENTIAL':
+                    $classification = CalDavBackend::CLASSIFICATION_CONFIDENTIAL;
+                    break;
+            }
+        }
+        return [
+            'etag' => md5($calendarData),
+            'size' => strlen($calendarData),
+            'componentType' => $componentType,
+            'firstOccurence' => is_null($firstOccurrence) ? null : max(0, $firstOccurrence),
+            'lastOccurence' => $lastOccurrence,
+            'uid' => $uid,
+            'classification' => $classification
+        ];
+    }
+
+    /**
+     * @param $cardData
+     * @return bool|string
+     */
+    private function readBlob($cardData) {
+        if (is_resource($cardData)) {
+            return stream_get_contents($cardData);
+        }
+
+        return $cardData;
+    }
+
+    /**
+     * @param list<array{href: string, commonName: string, readOnly: bool}> $add
+     * @param list<string> $remove
+     */
+    public function updateShares(IShareable $shareable, array $add, array $remove): void {
+        $calendarId = $shareable->getResourceId();
+        $calendarRow = $this->getCalendarById($calendarId);
+        if ($calendarRow === null) {
+            throw new \RuntimeException('Trying to update shares for innexistant calendar: ' . $calendarId);
+        }
+        $oldShares = $this->getShares($calendarId);
+
+        $this->calendarSharingBackend->updateShares($shareable, $add, $remove);
+
+        $this->dispatcher->dispatchTyped(new CalendarShareUpdatedEvent($calendarId, $calendarRow, $oldShares, $add, $remove));
+    }
+
+    /**
+     * @return list<array{href: string, commonName: string, status: int, readOnly: bool, '{http://owncloud.org/ns}principal': string, '{http://owncloud.org/ns}group-share': bool}>
+     */
+    public function getShares(int $resourceId): array {
+        return $this->calendarSharingBackend->getShares($resourceId);
+    }
+
+    /**
+     * @param boolean $value
+     * @param \OCA\DAV\CalDAV\Calendar $calendar
+     * @return string|null
+     */
+    public function setPublishStatus($value, $calendar) {
+        $calendarId = $calendar->getResourceId();
+        $calendarData = $this->getCalendarById($calendarId);
+
+        $query = $this->db->getQueryBuilder();
+        if ($value) {
+            $publicUri = $this->random->generate(16, ISecureRandom::CHAR_HUMAN_READABLE);
+            $query->insert('dav_shares')
+                ->values([
+                    'principaluri' => $query->createNamedParameter($calendar->getPrincipalURI()),
+                    'type' => $query->createNamedParameter('calendar'),
+                    'access' => $query->createNamedParameter(self::ACCESS_PUBLIC),
+                    'resourceid' => $query->createNamedParameter($calendar->getResourceId()),
+                    'publicuri' => $query->createNamedParameter($publicUri)
+                ]);
+            $query->executeStatement();
+
+            $this->dispatcher->dispatchTyped(new CalendarPublishedEvent($calendarId, $calendarData, $publicUri));
+            return $publicUri;
+        }
+        $query->delete('dav_shares')
+            ->where($query->expr()->eq('resourceid', $query->createNamedParameter($calendar->getResourceId())))
+            ->andWhere($query->expr()->eq('access', $query->createNamedParameter(self::ACCESS_PUBLIC)));
+        $query->executeStatement();
+
+        $this->dispatcher->dispatchTyped(new CalendarUnpublishedEvent($calendarId, $calendarData));
+        return null;
+    }
+
+    /**
+     * @param \OCA\DAV\CalDAV\Calendar $calendar
+     * @return mixed
+     */
+    public function getPublishStatus($calendar) {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select('publicuri')
+            ->from('dav_shares')
+            ->where($query->expr()->eq('resourceid', $query->createNamedParameter($calendar->getResourceId())))
+            ->andWhere($query->expr()->eq('access', $query->createNamedParameter(self::ACCESS_PUBLIC)))
+            ->executeQuery();
+
+        $row = $result->fetch();
+        $result->closeCursor();
+        return $row ? reset($row) : false;
+    }
+
+    /**
+     * @param int $resourceId
+     * @param list<array{privilege: string, principal: string, protected: bool}> $acl
+     * @return list<array{privilege: string, principal: string, protected: bool}>
+     */
+    public function applyShareAcl(int $resourceId, array $acl): array {
+        return $this->calendarSharingBackend->applyShareAcl($resourceId, $acl);
+    }
+
+    /**
+     * update properties table
+     *
+     * @param int $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @param int $calendarType
+     */
+    public function updateProperties($calendarId, $objectUri, $calendarData, $calendarType = self::CALENDAR_TYPE_CALENDAR) {
+        $objectId = $this->getCalendarObjectId($calendarId, $objectUri, $calendarType);
+
+        try {
+            $vCalendar = $this->readCalendarData($calendarData);
+        } catch (\Exception $ex) {
+            return;
+        }
+
+        $this->purgeProperties($calendarId, $objectId);
+
+        $query = $this->db->getQueryBuilder();
+        $query->insert($this->dbObjectPropertiesTable)
+            ->values(
+                [
+                    'calendarid' => $query->createNamedParameter($calendarId),
+                    'calendartype' => $query->createNamedParameter($calendarType),
+                    'objectid' => $query->createNamedParameter($objectId),
+                    'name' => $query->createParameter('name'),
+                    'parameter' => $query->createParameter('parameter'),
+                    'value' => $query->createParameter('value'),
+                ]
+            );
+
+        $indexComponents = ['VEVENT', 'VJOURNAL', 'VTODO'];
+        foreach ($vCalendar->getComponents() as $component) {
+            if (!in_array($component->name, $indexComponents)) {
+                continue;
+            }
+
+            foreach ($component->children() as $property) {
+                if (in_array($property->name, self::INDEXED_PROPERTIES, true)) {
+                    $value = $property->getValue();
+                    // is this a shitty db?
+                    if (!$this->db->supports4ByteText()) {
+                        $value = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $value);
+                    }
+                    $value = mb_strcut($value, 0, 254);
+
+                    $query->setParameter('name', $property->name);
+                    $query->setParameter('parameter', null);
+                    $query->setParameter('value', $value);
+                    $query->executeStatement();
+                }
+
+                if (array_key_exists($property->name, self::$indexParameters)) {
+                    $parameters = $property->parameters();
+                    $indexedParametersForProperty = self::$indexParameters[$property->name];
+
+                    foreach ($parameters as $key => $value) {
+                        if (in_array($key, $indexedParametersForProperty)) {
+                            // is this a shitty db?
+                            if ($this->db->supports4ByteText()) {
+                                $value = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $value);
+                            }
+
+                            $query->setParameter('name', $property->name);
+                            $query->setParameter('parameter', mb_strcut($key, 0, 254));
+                            $query->setParameter('value', mb_strcut($value, 0, 254));
+                            $query->executeStatement();
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * deletes all birthday calendars
+     */
+    public function deleteAllBirthdayCalendars() {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select(['id'])->from('calendars')
+            ->where($query->expr()->eq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)))
+            ->executeQuery();
+
+        $ids = $result->fetchAll();
+        $result->closeCursor();
+        foreach ($ids as $id) {
+            $this->deleteCalendar(
+                $id['id'],
+                true // No data to keep in the trashbin, if the user re-enables then we regenerate
+            );
+        }
+    }
+
+    /**
+     * @param $subscriptionId
+     */
+    public function purgeAllCachedEventsForSubscription($subscriptionId) {
+        $query = $this->db->getQueryBuilder();
+        $query->select('uri')
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)));
+        $stmt = $query->executeQuery();
+
+        $uris = [];
+        foreach ($stmt->fetchAll() as $row) {
+            $uris[] = $row['uri'];
+        }
+        $stmt->closeCursor();
+
+        $query = $this->db->getQueryBuilder();
+        $query->delete('calendarobjects')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        $query->delete('calendarchanges')
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        $query->delete($this->dbObjectPropertiesTable)
+            ->where($query->expr()->eq('calendarid', $query->createNamedParameter($subscriptionId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter(self::CALENDAR_TYPE_SUBSCRIPTION)))
+            ->executeStatement();
+
+        foreach ($uris as $uri) {
+            $this->addChange($subscriptionId, $uri, 3, self::CALENDAR_TYPE_SUBSCRIPTION);
+        }
+    }
+
+    /**
+     * Move a calendar from one user to another
+     *
+     * @param string $uriName
+     * @param string $uriOrigin
+     * @param string $uriDestination
+     * @param string $newUriName (optional) the new uriName
+     */
+    public function moveCalendar($uriName, $uriOrigin, $uriDestination, $newUriName = null) {
+        $query = $this->db->getQueryBuilder();
+        $query->update('calendars')
+            ->set('principaluri', $query->createNamedParameter($uriDestination))
+            ->set('uri', $query->createNamedParameter($newUriName ?: $uriName))
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($uriOrigin)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($uriName)))
+            ->executeStatement();
+    }
+
+    /**
+     * read VCalendar data into a VCalendar object
+     *
+     * @param string $objectData
+     * @return VCalendar
+     */
+    protected function readCalendarData($objectData) {
+        return Reader::read($objectData);
+    }
+
+    /**
+     * delete all properties from a given calendar object
+     *
+     * @param int $calendarId
+     * @param int $objectId
+     */
+    protected function purgeProperties($calendarId, $objectId) {
+        $query = $this->db->getQueryBuilder();
+        $query->delete($this->dbObjectPropertiesTable)
+            ->where($query->expr()->eq('objectid', $query->createNamedParameter($objectId)))
+            ->andWhere($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)));
+        $query->executeStatement();
+    }
+
+    /**
+     * get ID from a given calendar object
+     *
+     * @param int $calendarId
+     * @param string $uri
+     * @param int $calendarType
+     * @return int
+     */
+    protected function getCalendarObjectId($calendarId, $uri, $calendarType):int {
+        $query = $this->db->getQueryBuilder();
+        $query->select('id')
+            ->from('calendarobjects')
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($uri)))
+            ->andWhere($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
+            ->andWhere($query->expr()->eq('calendartype', $query->createNamedParameter($calendarType)));
+
+        $result = $query->executeQuery();
+        $objectIds = $result->fetch();
+        $result->closeCursor();
+
+        if (!isset($objectIds['id'])) {
+            throw new \InvalidArgumentException('Calendarobject does not exists: ' . $uri);
+        }
+
+        return (int)$objectIds['id'];
+    }
+
+    /**
+     * @throws \InvalidArgumentException
+     */
+    public function pruneOutdatedSyncTokens(int $keep = 10_000): int {
+        if ($keep < 0) {
+            throw new \InvalidArgumentException();
+        }
+        $query = $this->db->getQueryBuilder();
+        $query->delete('calendarchanges')
+            ->orderBy('id', 'DESC')
+            ->setFirstResult($keep);
+        return $query->executeStatement();
+    }
+
+    /**
+     * return legacy endpoint principal name to new principal name
+     *
+     * @param $principalUri
+     * @param $toV2
+     * @return string
+     */
+    private function convertPrincipal($principalUri, $toV2) {
+        if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
+            [, $name] = Uri\split($principalUri);
+            if ($toV2 === true) {
+                return "principals/users/$name";
+            }
+            return "principals/$name";
+        }
+        return $principalUri;
+    }
+
+    /**
+     * adds information about an owner to the calendar data
+     *
+     */
+    private function addOwnerPrincipalToCalendar(array $calendarInfo): array {
+        $ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
+        $displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
+        if (isset($calendarInfo[$ownerPrincipalKey])) {
+            $uri = $calendarInfo[$ownerPrincipalKey];
+        } else {
+            $uri = $calendarInfo['principaluri'];
+        }
+
+        $principalInformation = $this->principalBackend->getPrincipalByPath($uri);
+        if (isset($principalInformation['{DAV:}displayname'])) {
+            $calendarInfo[$displaynameKey] = $principalInformation['{DAV:}displayname'];
+        }
+        return $calendarInfo;
+    }
+
+    private function addResourceTypeToCalendar(array $row, array $calendar): array {
+        if (isset($row['deleted_at'])) {
+            // Columns is set and not null -> this is a deleted calendar
+            // we send a custom resourcetype to hide the deleted calendar
+            // from ordinary DAV clients, but the Calendar app will know
+            // how to handle this special resource.
+            $calendar['{DAV:}resourcetype'] = new DAV\Xml\Property\ResourceType([
+                '{DAV:}collection',
+                sprintf('{%s}deleted-calendar', \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD),
+            ]);
+        }
+        return $calendar;
+    }
+
+    /**
+     * Amend the calendar info with database row data
+     *
+     * @param array $row
+     * @param array $calendar
+     *
+     * @return array
+     */
+    private function rowToCalendar($row, array $calendar): array {
+        foreach ($this->propertyMap as $xmlName => [$dbName, $type]) {
+            $value = $row[$dbName];
+            if ($value !== null) {
+                settype($value, $type);
+            }
+            $calendar[$xmlName] = $value;
+        }
+        return $calendar;
+    }
+
+    /**
+     * Amend the subscription info with database row data
+     *
+     * @param array $row
+     * @param array $subscription
+     *
+     * @return array
+     */
+    private function rowToSubscription($row, array $subscription): array {
+        foreach ($this->subscriptionPropertyMap as $xmlName => [$dbName, $type]) {
+            $value = $row[$dbName];
+            if ($value !== null) {
+                settype($value, $type);
+            }
+            $subscription[$xmlName] = $value;
+        }
+        return $subscription;
+    }
 }

apps/dav/composer/composer/autoload_static.php

Spacing +321 added lines, -321 removed lines

@@ -6,340 +6,340 @@
 
 class ComposerStaticInitDAV
 {
-    public static $prefixLengthsPsr4 = array (
+    public static $prefixLengthsPsr4 = array(
         'O' => 
-        array (
+        array(
             'OCA\\DAV\\' => 8,
         ),
     );
 
-    public static $prefixDirsPsr4 = array (
+    public static $prefixDirsPsr4 = array(
         'OCA\\DAV\\' => 
-        array (
-            0 => __DIR__ . '/..' . '/../lib',
+        array(
+            0 => __DIR__.'/..'.'/../lib',
         ),
     );
 
-    public static $classMap = array (
-        'Composer\\InstalledVersions' => __DIR__ . '/..' . '/composer/InstalledVersions.php',
-        'OCA\\DAV\\AppInfo\\Application' => __DIR__ . '/..' . '/../lib/AppInfo/Application.php',
-        'OCA\\DAV\\AppInfo\\PluginManager' => __DIR__ . '/..' . '/../lib/AppInfo/PluginManager.php',
-        'OCA\\DAV\\Avatars\\AvatarHome' => __DIR__ . '/..' . '/../lib/Avatars/AvatarHome.php',
-        'OCA\\DAV\\Avatars\\AvatarNode' => __DIR__ . '/..' . '/../lib/Avatars/AvatarNode.php',
-        'OCA\\DAV\\Avatars\\RootCollection' => __DIR__ . '/..' . '/../lib/Avatars/RootCollection.php',
-        'OCA\\DAV\\BackgroundJob\\BuildReminderIndexBackgroundJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/BuildReminderIndexBackgroundJob.php',
-        'OCA\\DAV\\BackgroundJob\\CalendarRetentionJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/CalendarRetentionJob.php',
-        'OCA\\DAV\\BackgroundJob\\CleanupDirectLinksJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/CleanupDirectLinksJob.php',
-        'OCA\\DAV\\BackgroundJob\\CleanupInvitationTokenJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/CleanupInvitationTokenJob.php',
-        'OCA\\DAV\\BackgroundJob\\EventReminderJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/EventReminderJob.php',
-        'OCA\\DAV\\BackgroundJob\\GenerateBirthdayCalendarBackgroundJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/GenerateBirthdayCalendarBackgroundJob.php',
-        'OCA\\DAV\\BackgroundJob\\PruneOutdatedSyncTokensJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/PruneOutdatedSyncTokensJob.php',
-        'OCA\\DAV\\BackgroundJob\\RefreshWebcalJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/RefreshWebcalJob.php',
-        'OCA\\DAV\\BackgroundJob\\RegisterRegenerateBirthdayCalendars' => __DIR__ . '/..' . '/../lib/BackgroundJob/RegisterRegenerateBirthdayCalendars.php',
-        'OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJob.php',
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+        'OCA\\DAV\\Migration\\CalDAVRemoveEmptyValue' => __DIR__.'/..'.'/../lib/Migration/CalDAVRemoveEmptyValue.php',
+        'OCA\\DAV\\Migration\\ChunkCleanup' => __DIR__.'/..'.'/../lib/Migration/ChunkCleanup.php',
+        'OCA\\DAV\\Migration\\FixBirthdayCalendarComponent' => __DIR__.'/..'.'/../lib/Migration/FixBirthdayCalendarComponent.php',
+        'OCA\\DAV\\Migration\\RefreshWebcalJobRegistrar' => __DIR__.'/..'.'/../lib/Migration/RefreshWebcalJobRegistrar.php',
+        'OCA\\DAV\\Migration\\RegenerateBirthdayCalendars' => __DIR__.'/..'.'/../lib/Migration/RegenerateBirthdayCalendars.php',
+        'OCA\\DAV\\Migration\\RegisterBuildReminderIndexBackgroundJob' => __DIR__.'/..'.'/../lib/Migration/RegisterBuildReminderIndexBackgroundJob.php',
+        'OCA\\DAV\\Migration\\RemoveClassifiedEventActivity' => __DIR__.'/..'.'/../lib/Migration/RemoveClassifiedEventActivity.php',
+        'OCA\\DAV\\Migration\\RemoveDeletedUsersCalendarSubscriptions' => __DIR__.'/..'.'/../lib/Migration/RemoveDeletedUsersCalendarSubscriptions.php',
+        'OCA\\DAV\\Migration\\RemoveObjectProperties' => __DIR__.'/..'.'/../lib/Migration/RemoveObjectProperties.php',
+        'OCA\\DAV\\Migration\\RemoveOrphanEventsAndContacts' => __DIR__.'/..'.'/../lib/Migration/RemoveOrphanEventsAndContacts.php',
+        'OCA\\DAV\\Migration\\Version1004Date20170825134824' => __DIR__.'/..'.'/../lib/Migration/Version1004Date20170825134824.php',
+        'OCA\\DAV\\Migration\\Version1004Date20170919104507' => __DIR__.'/..'.'/../lib/Migration/Version1004Date20170919104507.php',
+        'OCA\\DAV\\Migration\\Version1004Date20170924124212' => __DIR__.'/..'.'/../lib/Migration/Version1004Date20170924124212.php',
+        'OCA\\DAV\\Migration\\Version1004Date20170926103422' => __DIR__.'/..'.'/../lib/Migration/Version1004Date20170926103422.php',
+        'OCA\\DAV\\Migration\\Version1005Date20180413093149' => __DIR__.'/..'.'/../lib/Migration/Version1005Date20180413093149.php',
+        'OCA\\DAV\\Migration\\Version1005Date20180530124431' => __DIR__.'/..'.'/../lib/Migration/Version1005Date20180530124431.php',
+        'OCA\\DAV\\Migration\\Version1006Date20180619154313' => __DIR__.'/..'.'/../lib/Migration/Version1006Date20180619154313.php',
+        'OCA\\DAV\\Migration\\Version1006Date20180628111625' => __DIR__.'/..'.'/../lib/Migration/Version1006Date20180628111625.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181030113700' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181030113700.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181105104826' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181105104826.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181105104833' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181105104833.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181105110300' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181105110300.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181105112049' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181105112049.php',
+        'OCA\\DAV\\Migration\\Version1008Date20181114084440' => __DIR__.'/..'.'/../lib/Migration/Version1008Date20181114084440.php',
+        'OCA\\DAV\\Migration\\Version1011Date20190725113607' => __DIR__.'/..'.'/../lib/Migration/Version1011Date20190725113607.php',
+        'OCA\\DAV\\Migration\\Version1011Date20190806104428' => __DIR__.'/..'.'/../lib/Migration/Version1011Date20190806104428.php',
+        'OCA\\DAV\\Migration\\Version1012Date20190808122342' => __DIR__.'/..'.'/../lib/Migration/Version1012Date20190808122342.php',
+        'OCA\\DAV\\Migration\\Version1016Date20201109085907' => __DIR__.'/..'.'/../lib/Migration/Version1016Date20201109085907.php',
+        'OCA\\DAV\\Migration\\Version1017Date20210216083742' => __DIR__.'/..'.'/../lib/Migration/Version1017Date20210216083742.php',
+        'OCA\\DAV\\Migration\\Version1018Date20210312100735' => __DIR__.'/..'.'/../lib/Migration/Version1018Date20210312100735.php',
+        'OCA\\DAV\\Migration\\Version1024Date20211221144219' => __DIR__.'/..'.'/../lib/Migration/Version1024Date20211221144219.php',
+        'OCA\\DAV\\Profiler\\ProfilerPlugin' => __DIR__.'/..'.'/../lib/Profiler/ProfilerPlugin.php',
+        'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningNode' => __DIR__.'/..'.'/../lib/Provisioning/Apple/AppleProvisioningNode.php',
+        'OCA\\DAV\\Provisioning\\Apple\\AppleProvisioningPlugin' => __DIR__.'/..'.'/../lib/Provisioning/Apple/AppleProvisioningPlugin.php',
+        'OCA\\DAV\\RootCollection' => __DIR__.'/..'.'/../lib/RootCollection.php',
+        'OCA\\DAV\\Search\\ACalendarSearchProvider' => __DIR__.'/..'.'/../lib/Search/ACalendarSearchProvider.php',
+        'OCA\\DAV\\Search\\ContactsSearchProvider' => __DIR__.'/..'.'/../lib/Search/ContactsSearchProvider.php',
+        'OCA\\DAV\\Search\\EventsSearchProvider' => __DIR__.'/..'.'/../lib/Search/EventsSearchProvider.php',
+        'OCA\\DAV\\Search\\TasksSearchProvider' => __DIR__.'/..'.'/../lib/Search/TasksSearchProvider.php',
+        'OCA\\DAV\\Server' => __DIR__.'/..'.'/../lib/Server.php',
+        'OCA\\DAV\\Settings\\AvailabilitySettings' => __DIR__.'/..'.'/../lib/Settings/AvailabilitySettings.php',
+        'OCA\\DAV\\Settings\\CalDAVSettings' => __DIR__.'/..'.'/../lib/Settings/CalDAVSettings.php',
+        'OCA\\DAV\\Storage\\PublicOwnerWrapper' => __DIR__.'/..'.'/../lib/Storage/PublicOwnerWrapper.php',
+        'OCA\\DAV\\SystemTag\\SystemTagMappingNode' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagMappingNode.php',
+        'OCA\\DAV\\SystemTag\\SystemTagNode' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagNode.php',
+        'OCA\\DAV\\SystemTag\\SystemTagPlugin' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagPlugin.php',
+        'OCA\\DAV\\SystemTag\\SystemTagsByIdCollection' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagsByIdCollection.php',
+        'OCA\\DAV\\SystemTag\\SystemTagsObjectMappingCollection' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagsObjectMappingCollection.php',
+        'OCA\\DAV\\SystemTag\\SystemTagsObjectTypeCollection' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagsObjectTypeCollection.php',
+        'OCA\\DAV\\SystemTag\\SystemTagsRelationsCollection' => __DIR__.'/..'.'/../lib/SystemTag/SystemTagsRelationsCollection.php',
+        'OCA\\DAV\\Traits\\PrincipalProxyTrait' => __DIR__.'/..'.'/../lib/Traits/PrincipalProxyTrait.php',
+        'OCA\\DAV\\Upload\\AssemblyStream' => __DIR__.'/..'.'/../lib/Upload/AssemblyStream.php',
+        'OCA\\DAV\\Upload\\ChunkingPlugin' => __DIR__.'/..'.'/../lib/Upload/ChunkingPlugin.php',
+        'OCA\\DAV\\Upload\\CleanupService' => __DIR__.'/..'.'/../lib/Upload/CleanupService.php',
+        'OCA\\DAV\\Upload\\FutureFile' => __DIR__.'/..'.'/../lib/Upload/FutureFile.php',
+        'OCA\\DAV\\Upload\\RootCollection' => __DIR__.'/..'.'/../lib/Upload/RootCollection.php',
+        'OCA\\DAV\\Upload\\UploadFile' => __DIR__.'/..'.'/../lib/Upload/UploadFile.php',
+        'OCA\\DAV\\Upload\\UploadFolder' => __DIR__.'/..'.'/../lib/Upload/UploadFolder.php',
+        'OCA\\DAV\\Upload\\UploadHome' => __DIR__.'/..'.'/../lib/Upload/UploadHome.php',
+        'OCA\\DAV\\UserMigration\\CalendarMigrator' => __DIR__.'/..'.'/../lib/UserMigration/CalendarMigrator.php',
+        'OCA\\DAV\\UserMigration\\CalendarMigratorException' => __DIR__.'/..'.'/../lib/UserMigration/CalendarMigratorException.php',
+        'OCA\\DAV\\UserMigration\\ContactsMigrator' => __DIR__.'/..'.'/../lib/UserMigration/ContactsMigrator.php',
+        'OCA\\DAV\\UserMigration\\ContactsMigratorException' => __DIR__.'/..'.'/../lib/UserMigration/ContactsMigratorException.php',
+        'OCA\\DAV\\UserMigration\\InvalidAddressBookException' => __DIR__.'/..'.'/../lib/UserMigration/InvalidAddressBookException.php',
+        'OCA\\DAV\\UserMigration\\InvalidCalendarException' => __DIR__.'/..'.'/../lib/UserMigration/InvalidCalendarException.php',
     );
 
     public static function getInitializer(ClassLoader $loader)
     {
-        return \Closure::bind(function () use ($loader) {
+        return \Closure::bind(function() use ($loader) {
             $loader->prefixLengthsPsr4 = ComposerStaticInitDAV::$prefixLengthsPsr4;
             $loader->prefixDirsPsr4 = ComposerStaticInitDAV::$prefixDirsPsr4;
             $loader->classMap = ComposerStaticInitDAV::$classMap;

apps/dav/composer/composer/autoload_classmap.php

Spacing +314 added lines, -314 removed lines

@@ -6,318 +6,318 @@
 $baseDir = $vendorDir;
 
 return array(
-    'Composer\\InstalledVersions' => $vendorDir . '/composer/InstalledVersions.php',
-    'OCA\\DAV\\AppInfo\\Application' => $baseDir . '/../lib/AppInfo/Application.php',
-    'OCA\\DAV\\AppInfo\\PluginManager' => $baseDir . '/../lib/AppInfo/PluginManager.php',
-    'OCA\\DAV\\Avatars\\AvatarHome' => $baseDir . '/../lib/Avatars/AvatarHome.php',
-    'OCA\\DAV\\Avatars\\AvatarNode' => $baseDir . '/../lib/Avatars/AvatarNode.php',
-    'OCA\\DAV\\Avatars\\RootCollection' => $baseDir . '/../lib/Avatars/RootCollection.php',
-    'OCA\\DAV\\BackgroundJob\\BuildReminderIndexBackgroundJob' => $baseDir . '/../lib/BackgroundJob/BuildReminderIndexBackgroundJob.php',
-    'OCA\\DAV\\BackgroundJob\\CalendarRetentionJob' => $baseDir . '/../lib/BackgroundJob/CalendarRetentionJob.php',
-    'OCA\\DAV\\BackgroundJob\\CleanupDirectLinksJob' => $baseDir . '/../lib/BackgroundJob/CleanupDirectLinksJob.php',
-    'OCA\\DAV\\BackgroundJob\\CleanupInvitationTokenJob' => $baseDir . '/../lib/BackgroundJob/CleanupInvitationTokenJob.php',
-    'OCA\\DAV\\BackgroundJob\\EventReminderJob' => $baseDir . '/../lib/BackgroundJob/EventReminderJob.php',
-    'OCA\\DAV\\BackgroundJob\\GenerateBirthdayCalendarBackgroundJob' => $baseDir . '/../lib/BackgroundJob/GenerateBirthdayCalendarBackgroundJob.php',
-    'OCA\\DAV\\BackgroundJob\\PruneOutdatedSyncTokensJob' => $baseDir . '/../lib/BackgroundJob/PruneOutdatedSyncTokensJob.php',
-    'OCA\\DAV\\BackgroundJob\\RefreshWebcalJob' => $baseDir . '/../lib/BackgroundJob/RefreshWebcalJob.php',
-    'OCA\\DAV\\BackgroundJob\\RegisterRegenerateBirthdayCalendars' => $baseDir . '/../lib/BackgroundJob/RegisterRegenerateBirthdayCalendars.php',
-    'OCA\\DAV\\BackgroundJob\\UpdateCalendarResourcesRoomsBackgroundJob' => $baseDir . '/../lib/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJob.php',
-    'OCA\\DAV\\BackgroundJob\\UploadCleanup' => $baseDir . '/../lib/BackgroundJob/UploadCleanup.php',
-    'OCA\\DAV\\BackgroundJob\\UserStatusAutomation' => $baseDir . '/../lib/BackgroundJob/UserStatusAutomation.php',
-    'OCA\\DAV\\BulkUpload\\BulkUploadPlugin' => $baseDir . '/../lib/BulkUpload/BulkUploadPlugin.php',
-    'OCA\\DAV\\BulkUpload\\MultipartRequestParser' => $baseDir . '/../lib/BulkUpload/MultipartRequestParser.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Backend' => $baseDir . '/../lib/CalDAV/Activity/Backend.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Filter\\Calendar' => $baseDir . '/../lib/CalDAV/Activity/Filter/Calendar.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Filter\\Todo' => $baseDir . '/../lib/CalDAV/Activity/Filter/Todo.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Provider\\Base' => $baseDir . '/../lib/CalDAV/Activity/Provider/Base.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Provider\\Calendar' => $baseDir . '/../lib/CalDAV/Activity/Provider/Calendar.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Provider\\Event' => $baseDir . '/../lib/CalDAV/Activity/Provider/Event.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Provider\\Todo' => $baseDir . '/../lib/CalDAV/Activity/Provider/Todo.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Setting\\CalDAVSetting' => $baseDir . '/../lib/CalDAV/Activity/Setting/CalDAVSetting.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Setting\\Calendar' => $baseDir . '/../lib/CalDAV/Activity/Setting/Calendar.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Setting\\Event' => $baseDir . '/../lib/CalDAV/Activity/Setting/Event.php',
-    'OCA\\DAV\\CalDAV\\Activity\\Setting\\Todo' => $baseDir . '/../lib/CalDAV/Activity/Setting/Todo.php',
-    'OCA\\DAV\\CalDAV\\Auth\\CustomPrincipalPlugin' => $baseDir . '/../lib/CalDAV/Auth/CustomPrincipalPlugin.php',
-    'OCA\\DAV\\CalDAV\\Auth\\PublicPrincipalPlugin' => $baseDir . '/../lib/CalDAV/Auth/PublicPrincipalPlugin.php',
-    'OCA\\DAV\\CalDAV\\BirthdayCalendar\\EnablePlugin' => $baseDir . '/../lib/CalDAV/BirthdayCalendar/EnablePlugin.php',
-    'OCA\\DAV\\CalDAV\\BirthdayService' => $baseDir . '/../lib/CalDAV/BirthdayService.php',
-    'OCA\\DAV\\CalDAV\\CachedSubscription' => $baseDir . '/../lib/CalDAV/CachedSubscription.php',
-    'OCA\\DAV\\CalDAV\\CachedSubscriptionObject' => $baseDir . '/../lib/CalDAV/CachedSubscriptionObject.php',
-    'OCA\\DAV\\CalDAV\\CalDavBackend' => $baseDir . '/../lib/CalDAV/CalDavBackend.php',
-    'OCA\\DAV\\CalDAV\\Calendar' => $baseDir . '/../lib/CalDAV/Calendar.php',
-    'OCA\\DAV\\CalDAV\\CalendarHome' => $baseDir . '/../lib/CalDAV/CalendarHome.php',
-    'OCA\\DAV\\CalDAV\\CalendarImpl' => $baseDir . '/../lib/CalDAV/CalendarImpl.php',
-    'OCA\\DAV\\CalDAV\\CalendarManager' => $baseDir . '/../lib/CalDAV/CalendarManager.php',
-    'OCA\\DAV\\CalDAV\\CalendarObject' => $baseDir . '/../lib/CalDAV/CalendarObject.php',
-    'OCA\\DAV\\CalDAV\\CalendarProvider' => $baseDir . '/../lib/CalDAV/CalendarProvider.php',
-    'OCA\\DAV\\CalDAV\\CalendarRoot' => $baseDir . '/../lib/CalDAV/CalendarRoot.php',
-    'OCA\\DAV\\CalDAV\\ICSExportPlugin\\ICSExportPlugin' => $baseDir . '/../lib/CalDAV/ICSExportPlugin/ICSExportPlugin.php',
-    'OCA\\DAV\\CalDAV\\IRestorable' => $baseDir . '/../lib/CalDAV/IRestorable.php',
-    'OCA\\DAV\\CalDAV\\Integration\\ExternalCalendar' => $baseDir . '/../lib/CalDAV/Integration/ExternalCalendar.php',
-    'OCA\\DAV\\CalDAV\\Integration\\ICalendarProvider' => $baseDir . '/../lib/CalDAV/Integration/ICalendarProvider.php',
-    'OCA\\DAV\\CalDAV\\InvitationResponse\\InvitationResponseServer' => $baseDir . '/../lib/CalDAV/InvitationResponse/InvitationResponseServer.php',
-    'OCA\\DAV\\CalDAV\\Outbox' => $baseDir . '/../lib/CalDAV/Outbox.php',
-    'OCA\\DAV\\CalDAV\\Plugin' => $baseDir . '/../lib/CalDAV/Plugin.php',
-    'OCA\\DAV\\CalDAV\\Principal\\Collection' => $baseDir . '/../lib/CalDAV/Principal/Collection.php',
-    'OCA\\DAV\\CalDAV\\Principal\\User' => $baseDir . '/../lib/CalDAV/Principal/User.php',
-    'OCA\\DAV\\CalDAV\\Proxy\\Proxy' => $baseDir . '/../lib/CalDAV/Proxy/Proxy.php',
-    'OCA\\DAV\\CalDAV\\Proxy\\ProxyMapper' => $baseDir . '/../lib/CalDAV/Proxy/ProxyMapper.php',
-    'OCA\\DAV\\CalDAV\\PublicCalendar' => $baseDir . '/../lib/CalDAV/PublicCalendar.php',
-    'OCA\\DAV\\CalDAV\\PublicCalendarObject' => $baseDir . '/../lib/CalDAV/PublicCalendarObject.php',
-    'OCA\\DAV\\CalDAV\\PublicCalendarRoot' => $baseDir . '/../lib/CalDAV/PublicCalendarRoot.php',
-    'OCA\\DAV\\CalDAV\\Publishing\\PublishPlugin' => $baseDir . '/../lib/CalDAV/Publishing/PublishPlugin.php',
-    'OCA\\DAV\\CalDAV\\Publishing\\Xml\\Publisher' => $baseDir . '/../lib/CalDAV/Publishing/Xml/Publisher.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\Backend' => $baseDir . '/../lib/CalDAV/Reminder/Backend.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\INotificationProvider' => $baseDir . '/../lib/CalDAV/Reminder/INotificationProvider.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProviderManager' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProviderManager.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\AbstractProvider' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProvider/AbstractProvider.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\AudioProvider' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProvider/AudioProvider.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\EmailProvider' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProvider/EmailProvider.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\ProviderNotAvailableException' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProvider/ProviderNotAvailableException.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\PushProvider' => $baseDir . '/../lib/CalDAV/Reminder/NotificationProvider/PushProvider.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\NotificationTypeDoesNotExistException' => $baseDir . '/../lib/CalDAV/Reminder/NotificationTypeDoesNotExistException.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\Notifier' => $baseDir . '/../lib/CalDAV/Reminder/Notifier.php',
-    'OCA\\DAV\\CalDAV\\Reminder\\ReminderService' => $baseDir . '/../lib/CalDAV/Reminder/ReminderService.php',
-    'OCA\\DAV\\CalDAV\\ResourceBooking\\AbstractPrincipalBackend' => $baseDir . '/../lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php',
-    'OCA\\DAV\\CalDAV\\ResourceBooking\\ResourcePrincipalBackend' => $baseDir . '/../lib/CalDAV/ResourceBooking/ResourcePrincipalBackend.php',
-    'OCA\\DAV\\CalDAV\\ResourceBooking\\RoomPrincipalBackend' => $baseDir . '/../lib/CalDAV/ResourceBooking/RoomPrincipalBackend.php',
-    'OCA\\DAV\\CalDAV\\RetentionService' => $baseDir . '/../lib/CalDAV/RetentionService.php',
-    'OCA\\DAV\\CalDAV\\Schedule\\IMipPlugin' => $baseDir . '/../lib/CalDAV/Schedule/IMipPlugin.php',
-    'OCA\\DAV\\CalDAV\\Schedule\\Plugin' => $baseDir . '/../lib/CalDAV/Schedule/Plugin.php',
-    'OCA\\DAV\\CalDAV\\Search\\SearchPlugin' => $baseDir . '/../lib/CalDAV/Search/SearchPlugin.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\CompFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/CompFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\LimitFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/LimitFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\OffsetFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/OffsetFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\ParamFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/ParamFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\PropFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/PropFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Filter\\SearchTermFilter' => $baseDir . '/../lib/CalDAV/Search/Xml/Filter/SearchTermFilter.php',
-    'OCA\\DAV\\CalDAV\\Search\\Xml\\Request\\CalendarSearchReport' => $baseDir . '/../lib/CalDAV/Search/Xml/Request/CalendarSearchReport.php',
-    'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObject' => $baseDir . '/../lib/CalDAV/Trashbin/DeletedCalendarObject.php',
-    'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObjectsCollection' => $baseDir . '/../lib/CalDAV/Trashbin/DeletedCalendarObjectsCollection.php',
-    'OCA\\DAV\\CalDAV\\Trashbin\\Plugin' => $baseDir . '/../lib/CalDAV/Trashbin/Plugin.php',
-    'OCA\\DAV\\CalDAV\\Trashbin\\RestoreTarget' => $baseDir . '/../lib/CalDAV/Trashbin/RestoreTarget.php',
-    'OCA\\DAV\\CalDAV\\Trashbin\\TrashbinHome' => $baseDir . '/../lib/CalDAV/Trashbin/TrashbinHome.php',
-    'OCA\\DAV\\CalDAV\\WebcalCaching\\Plugin' => $baseDir . '/../lib/CalDAV/WebcalCaching/Plugin.php',
-    'OCA\\DAV\\CalDAV\\WebcalCaching\\RefreshWebcalService' => $baseDir . '/../lib/CalDAV/WebcalCaching/RefreshWebcalService.php',
-    'OCA\\DAV\\Capabilities' => $baseDir . '/../lib/Capabilities.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Backend' => $baseDir . '/../lib/CardDAV/Activity/Backend.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Filter' => $baseDir . '/../lib/CardDAV/Activity/Filter.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Provider\\Addressbook' => $baseDir . '/../lib/CardDAV/Activity/Provider/Addressbook.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Provider\\Base' => $baseDir . '/../lib/CardDAV/Activity/Provider/Base.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Provider\\Card' => $baseDir . '/../lib/CardDAV/Activity/Provider/Card.php',
-    'OCA\\DAV\\CardDAV\\Activity\\Setting' => $baseDir . '/../lib/CardDAV/Activity/Setting.php',
-    'OCA\\DAV\\CardDAV\\AddressBook' => $baseDir . '/../lib/CardDAV/AddressBook.php',
-    'OCA\\DAV\\CardDAV\\AddressBookImpl' => $baseDir . '/../lib/CardDAV/AddressBookImpl.php',
-    'OCA\\DAV\\CardDAV\\AddressBookRoot' => $baseDir . '/../lib/CardDAV/AddressBookRoot.php',
-    'OCA\\DAV\\CardDAV\\CardDavBackend' => $baseDir . '/../lib/CardDAV/CardDavBackend.php',
-    'OCA\\DAV\\CardDAV\\ContactsManager' => $baseDir . '/../lib/CardDAV/ContactsManager.php',
-    'OCA\\DAV\\CardDAV\\Converter' => $baseDir . '/../lib/CardDAV/Converter.php',
-    'OCA\\DAV\\CardDAV\\HasPhotoPlugin' => $baseDir . '/../lib/CardDAV/HasPhotoPlugin.php',
-    'OCA\\DAV\\CardDAV\\ImageExportPlugin' => $baseDir . '/../lib/CardDAV/ImageExportPlugin.php',
-    'OCA\\DAV\\CardDAV\\Integration\\ExternalAddressBook' => $baseDir . '/../lib/CardDAV/Integration/ExternalAddressBook.php',
-    'OCA\\DAV\\CardDAV\\Integration\\IAddressBookProvider' => $baseDir . '/../lib/CardDAV/Integration/IAddressBookProvider.php',
-    'OCA\\DAV\\CardDAV\\MultiGetExportPlugin' => $baseDir . '/../lib/CardDAV/MultiGetExportPlugin.php',
-    'OCA\\DAV\\CardDAV\\PhotoCache' => $baseDir . '/../lib/CardDAV/PhotoCache.php',
-    'OCA\\DAV\\CardDAV\\Plugin' => $baseDir . '/../lib/CardDAV/Plugin.php',
-    'OCA\\DAV\\CardDAV\\SyncService' => $baseDir . '/../lib/CardDAV/SyncService.php',
-    'OCA\\DAV\\CardDAV\\SystemAddressbook' => $baseDir . '/../lib/CardDAV/SystemAddressbook.php',
-    'OCA\\DAV\\CardDAV\\UserAddressBooks' => $baseDir . '/../lib/CardDAV/UserAddressBooks.php',
-    'OCA\\DAV\\CardDAV\\Xml\\Groups' => $baseDir . '/../lib/CardDAV/Xml/Groups.php',
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