CalDavBackend::getSubscriptionsForUser() - Code Metrics - Inspection of "Merge pull request #6840 from nextcloud/feature/52..." - nextcloud/server - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — master ( 44b423...f32fbb )

by Morris
created 2017-11-16 20:10 UTC
CalDavBackend::getSubscriptionsForUser() B

↳ Parent: CalDavBackend
Complexity

Conditions	4
Paths	4
Size

Total Lines	40
Code Lines	27
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	4
eloc	27
nc	4
nop	1
dl	0
loc	40
rs	8.5806
c	0
b	0
f	0
<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 * @copyright Copyright (c) 2017 Georg Ehrke
 *
 * @author Georg Ehrke <[email protected]>
 * @author Joas Schilling <[email protected]>
 * @author Lukas Reschke <[email protected]>
 * @author nhirokinet <[email protected]>
 * @author Robin Appelman <[email protected]>
 * @author Roeland Jago Douma <[email protected]>
 * @author Stefan Weil <[email protected]>
 * @author Thomas Citharel <[email protected]>
 * @author Thomas Müller <[email protected]>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OCA\DAV\CalDAV;

use OCA\DAV\DAV\Sharing\IShareable;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCA\DAV\Connector\Sabre\Principal;
use OCA\DAV\DAV\Sharing\Backend;
use OCP\IDBConnection;
use OCP\IGroupManager;
use OCP\IUser;
use OCP\IUserManager;
use OCP\Security\ISecureRandom;
use Sabre\CalDAV\Backend\AbstractBackend;
use Sabre\CalDAV\Backend\SchedulingSupport;
use Sabre\CalDAV\Backend\SubscriptionSupport;
use Sabre\CalDAV\Backend\SyncSupport;
use Sabre\CalDAV\Xml\Property\ScheduleCalendarTransp;
use Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet;
use Sabre\DAV;
use Sabre\DAV\Exception\Forbidden;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\PropPatch;
use Sabre\HTTP\URLUtil;
use Sabre\VObject\Component;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\Component\VEvent;
use Sabre\VObject\Component\VTimeZone;
use Sabre\VObject\DateTimeParser;
use Sabre\VObject\Property;
use Sabre\VObject\Reader;
use Sabre\VObject\Recur\EventIterator;
use Sabre\Uri;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\GenericEvent;

/**
 * Class CalDavBackend
 *
 * Code is heavily inspired by https://github.com/fruux/sabre-dav/blob/master/lib/CalDAV/Backend/PDO.php
 *
 * @package OCA\DAV\CalDAV
 */
class CalDavBackend extends AbstractBackend implements SyncSupport, SubscriptionSupport, SchedulingSupport {

	const PERSONAL_CALENDAR_URI = 'personal';
	const PERSONAL_CALENDAR_NAME = 'Personal';

	/**
	 * 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.
	 */
	const MAX_DATE = '2038-01-01';

	const ACCESS_PUBLIC = 4;
	const CLASSIFICATION_PUBLIC = 0;
	const CLASSIFICATION_PRIVATE = 1;
	const CLASSIFICATION_CONFIDENTIAL = 2;

	/**
	 * List of CalDAV properties, and how they map to database field names
	 * Add your own properties by simply adding on to this array.
	 *
	 * Note that only string-based properties are supported here.
	 *
	 * @var array
	 */
	public $propertyMap = [
		'{DAV:}displayname'                          => 'displayname',
		'{urn:ietf:params:xml:ns:caldav}calendar-description' => 'description',
		'{urn:ietf:params:xml:ns:caldav}calendar-timezone'    => 'timezone',
		'{http://apple.com/ns/ical/}calendar-order'  => 'calendarorder',
		'{http://apple.com/ns/ical/}calendar-color'  => 'calendarcolor',
	];

	/**
	 * List of subscription properties, and how they map to database field names.
	 *
	 * @var array
	 */
	public $subscriptionPropertyMap = [
		'{DAV:}displayname'                                           => 'displayname',
		'{http://apple.com/ns/ical/}refreshrate'                      => 'refreshrate',
		'{http://apple.com/ns/ical/}calendar-order'                   => 'calendarorder',
		'{http://apple.com/ns/ical/}calendar-color'                   => 'calendarcolor',
		'{http://calendarserver.org/ns/}subscribed-strip-todos'       => 'striptodos',
		'{http://calendarserver.org/ns/}subscribed-strip-alarms'      => 'stripalarms',
		'{http://calendarserver.org/ns/}subscribed-strip-attachments' => 'stripattachments',
	];

	/** @var array properties to index */
	public static $indexProperties = ['CATEGORIES', 'COMMENT', 'DESCRIPTION',
		'LOCATION', 'RESOURCES', 'STATUS', 'SUMMARY', 'ATTENDEE', 'CONTACT',
		'ORGANIZER'];

	/** @var array parameters to index */
	public static $indexParameters = [
		'ATTENDEE' => ['CN'],
		'ORGANIZER' => ['CN'],
	];

	/**
	 * @var string[] Map of uid => display name
	 */
	protected $userDisplayNames;

	/** @var IDBConnection */
	private $db;

	/** @var Backend */
	private $sharingBackend;

	/** @var Principal */
	private $principalBackend;

	/** @var IUserManager */
	private $userManager;

	/** @var ISecureRandom */
	private $random;

	/** @var EventDispatcherInterface */
	private $dispatcher;

	/** @var bool */
	private $legacyEndpoint;

	/** @var string */
	private $dbObjectPropertiesTable = 'calendarobjects_props';

	/**
	 * CalDavBackend constructor.
	 *
	 * @param IDBConnection $db
	 * @param Principal $principalBackend
	 * @param IUserManager $userManager
	 * @param IGroupManager $groupManager
	 * @param ISecureRandom $random
	 * @param EventDispatcherInterface $dispatcher
	 * @param bool $legacyEndpoint
	 */
	public function __construct(IDBConnection $db,
								Principal $principalBackend,
								IUserManager $userManager,
								IGroupManager $groupManager,
								ISecureRandom $random,
								EventDispatcherInterface $dispatcher,
								$legacyEndpoint = false) {
		$this->db = $db;
		$this->principalBackend = $principalBackend;
		$this->userManager = $userManager;
		$this->sharingBackend = new Backend($this->db, $this->userManager, $groupManager, $principalBackend, 'calendar');
		$this->random = $random;
		$this->dispatcher = $dispatcher;
		$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->createFunction('COUNT(*)'))
			->from('calendars')
			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));

		if ($excludeBirthday) {
			$query->andWhere($query->expr()->neq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)));
		}

		return (int)$query->execute()->fetchColumn();
	}

	/**
	 * 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 $principalUri
	 * @return array
	 */
	function getCalendarsForUser($principalUri) {

		$principalUriOriginal = $principalUri;
		$principalUri = $this->convertPrincipal($principalUri, true);
		$fields = array_values($this->propertyMap);
		$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->execute();

		$calendars = [];
		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {

			$components = [];
			if ($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),
			];

			foreach($this->propertyMap as $xmlName=>$dbName) {
				$calendar[$xmlName] = $row[$dbName];
			}

			$this->addOwnerPrincipal($calendar);

			if (!isset($calendars[$calendar['id']])) {
				$calendars[$calendar['id']] = $calendar;
			}
		}

		$stmt->closeCursor();

		// query for shared calendars
		$principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
		$principals = array_map(function($principal) {
			return urldecode($principal);
		}, $principals);
		$principals[]= $principalUri;

		$fields = array_values($this->propertyMap);
		$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();
		$result = $query->select($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)
			->execute();

		$readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
		while($row = $result->fetch()) {
			if ($row['principaluri'] === $principalUri) {
				continue;
			}

			$readOnly = (int) $row['access'] === Backend::ACCESS_READ;
			if (isset($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;
				}
			}

			list(, $name) = Uri\split($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($components),
				'{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' => new ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $this->convertPrincipal($row['principaluri'], !$this->legacyEndpoint),
				$readOnlyPropertyName => $readOnly,
			];

			foreach($this->propertyMap as $xmlName=>$dbName) {
				$calendar[$xmlName] = $row[$dbName];
			}

			$this->addOwnerPrincipal($calendar);

			$calendars[$calendar['id']] = $calendar;
		}
		$result->closeCursor();

		return array_values($calendars);
	}

	public function getUsersOwnCalendars($principalUri) {
		$principalUri = $this->convertPrincipal($principalUri, true);
		$fields = array_values($this->propertyMap);
		$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->execute();
		$calendars = [];
		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
			$components = [];
			if ($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'),
			];
			foreach($this->propertyMap as $xmlName=>$dbName) {
				$calendar[$xmlName] = $row[$dbName];
			}

			$this->addOwnerPrincipal($calendar);

			if (!isset($calendars[$calendar['id']])) {
				$calendars[$calendar['id']] = $calendar;
			}
		}
		$stmt->closeCursor();
		return array_values($calendars);
	}


	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() {
		$fields = array_values($this->propertyMap);
		$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')))
			->execute();

		while($row = $result->fetch()) {
			list(, $name) = Uri\split($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,
			];

			foreach($this->propertyMap as $xmlName=>$dbName) {
				$calendar[$xmlName] = $row[$dbName];
			}

			$this->addOwnerPrincipal($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) {
		$fields = array_values($this->propertyMap);
		$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)))
			->execute();

		$row = $result->fetch(\PDO::FETCH_ASSOC);

		$result->closeCursor();

		if ($row === false) {
			throw new NotFound('Node with name \'' . $uri . '\' could not be found');
		}

		list(, $name) = Uri\split($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,
		];

		foreach($this->propertyMap as $xmlName=>$dbName) {
			$calendar[$xmlName] = $row[$dbName];
		}

		$this->addOwnerPrincipal($calendar);

		return $calendar;

	}

	/**
	 * @param string $principal
	 * @param string $uri
	 * @return array|null
	 */
	public function getCalendarByUri($principal, $uri) {
		$fields = array_values($this->propertyMap);
		$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->execute();

		$row = $stmt->fetch(\PDO::FETCH_ASSOC);
		$stmt->closeCursor();
		if ($row === false) {
			return null;
		}

		$components = [];
		if ($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'),
		];

		foreach($this->propertyMap as $xmlName=>$dbName) {
			$calendar[$xmlName] = $row[$dbName];
		}

		$this->addOwnerPrincipal($calendar);

		return $calendar;
	}

	public function getCalendarById($calendarId) {
		$fields = array_values($this->propertyMap);
		$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->execute();

		$row = $stmt->fetch(\PDO::FETCH_ASSOC);
		$stmt->closeCursor();
		if ($row === false) {
			return null;
		}

		$components = [];
		if ($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'),
		];

		foreach($this->propertyMap as $xmlName=>$dbName) {
			$calendar[$xmlName] = $row[$dbName];
		}

		$this->addOwnerPrincipal($calendar);

		return $calendar;
	}

	/**
	 * 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 $properties
	 * @return int
	 * @suppress SqlInjectionChecker
	 */
	function createCalendar($principalUri, $calendarUri, array $properties) {

		$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[$sccs] instanceof SupportedCalendarComponentSet)) {
if ($x instanceof DoesNotExist) {
    // Do something.
}
				throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
			}
			$values['components'] = implode(',',$properties[$sccs]->getValue());
		}
		$transp = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
		if (isset($properties[$transp])) {
			$values['transparent'] = (int) ($properties[$transp]->getValue() === 'transparent');
		}

		foreach($this->propertyMap as $xmlName=>$dbName) {
			if (isset($properties[$xmlName])) {
				$values[$dbName] = $properties[$xmlName];
			}
		}

		$query = $this->db->getQueryBuilder();
		$query->insert('calendars');
		foreach($values as $column => $value) {
			$query->setValue($column, $query->createNamedParameter($value));
		}
		$query->execute();
		$calendarId = $query->getLastInsertId();

		$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::createCalendar', new GenericEvent(
			'\OCA\DAV\CalDAV\CalDavBackend::createCalendar',
			[
				'calendarId' => $calendarId,
				'calendarData' => $this->getCalendarById($calendarId),
		]));

		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 $propPatch
	 * @return void
	 */
	function updateCalendar($calendarId, PropPatch $propPatch) {

		$supportedProperties = array_keys($this->propertyMap);
		$supportedProperties[] = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';

		/**
		 * @suppress SqlInjectionChecker
		 */
		$propPatch->handle($supportedProperties, function($mutations) use ($calendarId) {
			$newValues = [];
			foreach ($mutations as $propertyName => $propertyValue) {

				switch ($propertyName) {
					case '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' :
switch ($selector) {
    case "A": //right
        doSomething();
        break;
    case "B" : //wrong
        doSomethingElse();
        break;
}
						$fieldName = 'transparent';
						$newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
						break;
					default :
switch ($expr) {
    default : //wrong
        doSomething();
        break;
}

switch ($expr) {
    default: //right
        doSomething();
        break;
}
						$fieldName = $this->propertyMap[$propertyName];
						$newValues[$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->execute();

			$this->addChange($calendarId, "", 2);

			$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::updateCalendar', new GenericEvent(
				'\OCA\DAV\CalDAV\CalDavBackend::updateCalendar',
				[
					'calendarId' => $calendarId,
					'calendarData' => $this->getCalendarById($calendarId),
					'shares' => $this->getShares($calendarId),
					'propertyMutations' => $mutations,
			]));

			return true;
		});
	}

	/**
	 * Delete a calendar and all it's objects
	 *
	 * @param mixed $calendarId
	 * @return void
	 */
	function deleteCalendar($calendarId) {

		$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::deleteCalendar', new GenericEvent(
			'\OCA\DAV\CalDAV\CalDavBackend::deleteCalendar',
			[
				'calendarId' => $calendarId,
				'calendarData' => $this->getCalendarById($calendarId),
				'shares' => $this->getShares($calendarId),
		]));

		$stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendarobjects` WHERE `calendarid` = ?');
		$stmt->execute([$calendarId]);

		$stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendars` WHERE `id` = ?');
		$stmt->execute([$calendarId]);

		$stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendarchanges` WHERE `calendarid` = ?');
		$stmt->execute([$calendarId]);

		$this->sharingBackend->deleteAllShares($calendarId);

		$query = $this->db->getQueryBuilder();
		$query->delete($this->dbObjectPropertiesTable)
			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)))
			->execute();
	}

	/**
	 * Delete all of an user's shares
	 *
	 * @param string $principaluri
	 * @return void
	 */
	function deleteAllSharesByUser($principaluri) {

		$this->sharingBackend->deleteAllSharesByUser($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 $calendarId
	 * @return array
	 */
	function getCalendarObjects($calendarId) {

		$query = $this->db->getQueryBuilder();
		$query->select(['id', 'uri', 'lastmodified', 'etag', 'calendarid', 'size', 'componenttype', 'classification'])
			->from('calendarobjects')
			->where($query->expr()->eq('calendarid', $query->createNamedParameter($calendarId)));
		$stmt = $query->execute();

		$result = [];
		foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) 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']
			];
		}

		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 $objectUri
	 * @return array|null
	 */
	function getCalendarObject($calendarId, $objectUri) {


		$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()->eq('uri', $query->createNamedParameter($objectUri)));
		$stmt = $query->execute();
		$row = $stmt->fetch(\PDO::FETCH_ASSOC);

		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']
		];
	}

	/**
	 * 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[] $uris
	 * @return array
	 */
	function getMultipleCalendarObjects($calendarId, array $uris) {

		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')));

		foreach ($chunks as $uris) {
			$query->setParameter('uri', $uris, IQueryBuilder::PARAM_STR_ARRAY);
			$result = $query->execute();

			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 $calendarData
	 * @return string
	 */
	function createCalendarObject($calendarId, $objectUri, $calendarData) {

		$extraData = $this->getDenormalizedData($calendarData);

		$q = $this->db->getQueryBuilder();
		$q->select($q->createFunction('COUNT(*)'))
			->from('calendarobjects')
			->where($q->expr()->eq('calendarid', $q->createNamedParameter($calendarId)))
			->andWhere($q->expr()->eq('uid', $q->createNamedParameter($extraData['uid'])));

		$result = $q->execute();
		$count = (int) $result->fetchColumn();
		$result->closeCursor();

		if ($count !== 0) {
			throw new \Sabre\DAV\Exception\BadRequest('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']),
			])
			->execute();

		$this->updateProperties($calendarId, $objectUri, $calendarData);

		$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::createCalendarObject', new GenericEvent(
			'\OCA\DAV\CalDAV\CalDavBackend::createCalendarObject',
			[
				'calendarId' => $calendarId,
				'calendarData' => $this->getCalendarById($calendarId),
				'shares' => $this->getShares($calendarId),
				'objectData' => $this->getCalendarObject($calendarId, $objectUri),
			]
		));
		$this->addChange($calendarId, $objectUri, 1);

		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 $calendarData
	 * @return string
	 */
	function updateCalendarObject($calendarId, $objectUri, $calendarData) {

		$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)))
			->execute();

		$this->updateProperties($calendarId, $objectUri, $calendarData);

		$data = $this->getCalendarObject($calendarId, $objectUri);
		if (is_array($data)) {
			$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::updateCalendarObject', new GenericEvent(
				'\OCA\DAV\CalDAV\CalDavBackend::updateCalendarObject',
				[
					'calendarId' => $calendarId,
					'calendarData' => $this->getCalendarById($calendarId),
					'shares' => $this->getShares($calendarId),
					'objectData' => $data,
				]
			));
		}
		$this->addChange($calendarId, $objectUri, 2);

		return '"' . $extraData['etag'] . '"';
	}

	/**
	 * @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)))
			->execute();
	}

	/**
	 * Deletes an existing calendar object.
	 *
	 * The object uri is only the basename, or filename and not a full path.
	 *
	 * @param mixed $calendarId
	 * @param string $objectUri
	 * @return void
	 */
	function deleteCalendarObject($calendarId, $objectUri) {

		$data = $this->getCalendarObject($calendarId, $objectUri);
		if (is_array($data)) {
			$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::deleteCalendarObject', new GenericEvent(
				'\OCA\DAV\CalDAV\CalDavBackend::deleteCalendarObject',
				[
					'calendarId' => $calendarId,
					'calendarData' => $this->getCalendarById($calendarId),
					'shares' => $this->getShares($calendarId),
					'objectData' => $data,
				]
			));
		}

		$stmt = $this->db->prepare('DELETE FROM `*PREFIX*calendarobjects` WHERE `calendarid` = ? AND `uri` = ?');
		$stmt->execute([$calendarId, $objectUri]);

		$this->purgeProperties($calendarId, $data['id']);

		$this->addChange($calendarId, $objectUri, 3);
	}

	/**
	 * 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 interprete 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 $filters
	 * @return array
	 */
	function calendarQuery($calendarId, array $filters) {

		$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'])) {
				$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)));

		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->execute();

		$result = [];
		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
			if ($requirePostFilter) {
				if (!$this->validateFilterForObject($row, $filters)) {
					continue;
				}
			}
			$result[] = $row['uri'];
		}

		return $result;
	}

	/**
	 * custom Nextcloud search extension for CalDAV
	 *
	 * @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()
				->eq('c.calendarid', $query->createNamedParameter($id));
		}
		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))
			);
		}

		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']).'%')));

		if ($offset) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
			$query->setFirstResult($offset);
		}
		if ($limit) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
			$query->setMaxResults($limit);
		}

		$stmt = $query->execute();

		$result = [];
		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
			$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'])));

		// only return public items for shared calendars for now
		if ($calendarInfo['principaluri'] !== $calendarInfo['{http://owncloud.org/ns}owner-principal']) {
			$innerQuery->andWhere($innerQuery->expr()->eq('c.classification',
				$outerQuery->createNamedParameter(self::CLASSIFICATION_PUBLIC)));
		}

		$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');

		if (isset($options['timerange'])) {
			if (isset($options['timerange']['start'])) {
				$outerQuery->andWhere($outerQuery->expr()->gt('lastoccurence',
					$outerQuery->createNamedParameter($options['timerange']['start']->getTimeStamp)));

			}
			if (isset($options['timerange']['end'])) {
				$outerQuery->andWhere($outerQuery->expr()->lt('firstoccurence',
					$outerQuery->createNamedParameter($options['timerange']['end']->getTimeStamp)));
			}
		}

		if (isset($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) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
			$outerQuery->setFirstResult($offset);
		}
		if ($limit) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
			$outerQuery->setMaxResults($limit);
		}

		$result = $outerQuery->execute();
		$calendarObjects = $result->fetchAll();

		return array_map(function($o) {
			$calendarData = Reader::read($o['calendardata']);
			$comps = $calendarData->getComponents();
			$objects = [];
			$timezones = [];
			foreach($comps as $comp) {
				if ($comp instanceof VTimeZone) {
if ($x instanceof DoesNotExist) {
    // Do something.
}
					$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 $c instanceof Property;
if ($x instanceof DoesNotExist) {
    // Do something.
}
		});
		$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) {
if ($x instanceof DoesNotExist) {
    // Do something.
}
			$value = $prop->getDateTime();
		} else {
			$value = $prop->getValue();
		}

		return [
			$value,
			$prop->parameters()
		];
	}

	/**
	 * 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 $uid
	 * @return string|null
	 */
	function getCalendarObjectByUID($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)));

		$stmt = $query->execute();

		if ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
			return $row['calendaruri'] . '/' . $row['objecturi'];
		}

		return 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 $limit
	 * @return array
	 */
	function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null) {

		// Current synctoken
		$stmt = $this->db->prepare('SELECT `synctoken` FROM `*PREFIX*calendars` WHERE `id` = ?');
		$stmt->execute([ $calendarId ]);
		$currentToken = $stmt->fetchColumn(0);

		if (is_null($currentToken)) {
			return null;
		}

		$result = [
			'syncToken' => $currentToken,
			'added'     => [],
			'modified'  => [],
			'deleted'   => [],
		];

		if ($syncToken) {

			$query = "SELECT `uri`, `operation` FROM `*PREFIX*calendarchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `calendarid` = ? ORDER BY `synctoken`";
			if ($limit>0) {
				$query.= " LIMIT " . (int)$limit;
			}

			// Fetching all changes
			$stmt = $this->db->prepare($query);
			$stmt->execute([$syncToken, $currentToken, $calendarId]);

			$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'];

			}

			foreach($changes as $uri => $operation) {

				switch($operation) {
					case 1 :
switch ($selector) {
    case "A": //right
        doSomething();
        break;
    case "B" : //wrong
        doSomethingElse();
        break;
}
						$result['added'][] = $uri;
						break;
					case 2 :
switch ($selector) {
    case "A": //right
        doSomething();
        break;
    case "B" : //wrong
        doSomethingElse();
        break;
}
						$result['modified'][] = $uri;
						break;
					case 3 :
switch ($selector) {
    case "A": //right
        doSomething();
        break;
    case "B" : //wrong
        doSomethingElse();
        break;
}
						$result['deleted'][] = $uri;
						break;
				}

			}
		} else {
			// No synctoken supplied, this is the initial sync.
			$query = "SELECT `uri` FROM `*PREFIX*calendarobjects` WHERE `calendarid` = ?";
			$stmt = $this->db->prepare($query);
			$stmt->execute([$calendarId]);

			$result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
		}
		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 $principalUri
	 * @return array
	 */
	function getSubscriptionsForUser($principalUri) {

		$fields = array_values($this->subscriptionPropertyMap);
		$fields[] = 'id';
		$fields[] = 'uri';
		$fields[] = 'source';
		$fields[] = 'principaluri';
		$fields[] = 'lastmodified';

		$query = $this->db->getQueryBuilder();
		$query->select($fields)
			->from('calendarsubscriptions')
			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
			->orderBy('calendarorder', 'asc');
		$stmt =$query->execute();

		$subscriptions = [];
		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {

			$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']),
			];

			foreach($this->subscriptionPropertyMap as $xmlName=>$dbName) {
				if (!is_null($row[$dbName])) {
					$subscription[$xmlName] = $row[$dbName];
				}
			}

			$subscriptions[] = $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 $properties
	 * @return mixed
	 */
	function createSubscription($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) {
			if (array_key_exists($xmlName, $properties)) {
					$values[$dbName] = $properties[$xmlName];
					if (in_array($dbName, $propertiesBoolean)) {
						$values[$dbName] = true;
				}
			}
		}

		$valuesToInsert = array();

		$query = $this->db->getQueryBuilder();

		foreach (array_keys($values) as $name) {
			$valuesToInsert[$name] = $query->createNamedParameter($values[$name]);
		}

		$query->insert('calendarsubscriptions')
			->values($valuesToInsert)
			->execute();

		return $this->db->lastInsertId('*PREFIX*calendarsubscriptions');
	}

	/**
	 * 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 $propPatch
	 * @return void
	 */
	function updateSubscription($subscriptionId, PropPatch $propPatch) {

		$supportedProperties = array_keys($this->subscriptionPropertyMap);
		$supportedProperties[] = '{http://calendarserver.org/ns/}source';

		/**
		 * @suppress SqlInjectionChecker
		 */
		$propPatch->handle($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];
					$newValues[$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)))
				->execute();

			return true;

		});
	}

	/**
	 * Deletes a subscription.
	 *
	 * @param mixed $subscriptionId
	 * @return void
	 */
	function deleteSubscription($subscriptionId) {

		$query = $this->db->getQueryBuilder();
		$query->delete('calendarsubscriptions')
			->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
			->execute();
	}

	/**
	 * 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 $objectUri
	 * @return array
	 */
	function getSchedulingObject($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)))
			->execute();

		$row = $stmt->fetch(\PDO::FETCH_ASSOC);

		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 $principalUri
	 * @return array
	 */
	function getSchedulingObjects($principalUri) {

		$query = $this->db->getQueryBuilder();
		$stmt = $query->select(['uri', 'calendardata', 'lastmodified', 'etag', 'size'])
				->from('schedulingobjects')
				->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
				->execute();

		$result = [];
		foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
			$result[] = [
					'calendardata' => $row['calendardata'],
					'uri'          => $row['uri'],
					'lastmodified' => $row['lastmodified'],
					'etag'         => '"' . $row['etag'] . '"',
					'size'         => (int)$row['size'],
			];
		}

		return $result;
	}

	/**
	 * Deletes a scheduling object from the inbox collection.
	 *
	 * @param string $principalUri
	 * @param string $objectUri
	 * @return void
	 */
	function deleteSchedulingObject($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)))
				->execute();
	}

	/**
	 * Creates a new scheduling object. This should land in a users' inbox.
	 *
	 * @param string $principalUri
	 * @param string $objectUri
	 * @param string $objectData
	 * @return void
	 */
	function createSchedulingObject($principalUri, $objectUri, $objectData) {

		$query = $this->db->getQueryBuilder();
		$query->insert('schedulingobjects')
			->values([
				'principaluri' => $query->createNamedParameter($principalUri),
				'calendardata' => $query->createNamedParameter($objectData),
				'uri' => $query->createNamedParameter($objectUri),
				'lastmodified' => $query->createNamedParameter(time()),
				'etag' => $query->createNamedParameter(md5($objectData)),
				'size' => $query->createNamedParameter(strlen($objectData))
			])
			->execute();
	}

	/**
	 * Adds a change record to the calendarchanges table.
	 *
	 * @param mixed $calendarId
	 * @param string $objectUri
	 * @param int $operation 1 = add, 2 = modify, 3 = delete.
	 * @return void
	 */
	protected function addChange($calendarId, $objectUri, $operation) {

		$stmt = $this->db->prepare('INSERT INTO `*PREFIX*calendarchanges` (`uri`, `synctoken`, `calendarid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `*PREFIX*calendars` WHERE `id` = ?');
		$stmt->execute([
			$objectUri,
			$calendarId,
			$operation,
			$calendarId
		]);
		$stmt = $this->db->prepare('UPDATE `*PREFIX*calendars` 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);
		$componentType = null;
		$component = null;
		$firstOccurrence = null;
		$lastOccurrence = null;
		$uid = null;
		$classification = self::CLASSIFICATION_PUBLIC;
		foreach($vObject->getComponents() as $component) {
			if ($component->name!=='VTIMEZONE') {
				$componentType = $component->name;
				$uid = (string)$component->UID;
				break;
			}
		}
		if (!$componentType) {
			throw new \Sabre\DAV\Exception\BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
		}
		if ($componentType === 'VEVENT' && $component->DTSTART) {
			$firstOccurrence = $component->DTSTART->getDateTime()->getTimeStamp();
			// Finding the last occurrence is a bit harder
			if (!isset($component->RRULE)) {
				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 {
				$it = new EventIterator($vObject, (string)$component->UID);
				$maxDate = new \DateTime(self::MAX_DATE);
				if ($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
		];

	}

	private function readBlob($cardData) {
		if (is_resource($cardData)) {
			return stream_get_contents($cardData);
		}

		return $cardData;
	}

	/**
	 * @param IShareable $shareable
	 * @param array $add
	 * @param array $remove
	 */
	public function updateShares($shareable, $add, $remove) {
		$calendarId = $shareable->getResourceId();
		$this->dispatcher->dispatch('\OCA\DAV\CalDAV\CalDavBackend::updateShares', new GenericEvent(
			'\OCA\DAV\CalDAV\CalDavBackend::updateShares',
			[
				'calendarId' => $calendarId,
				'calendarData' => $this->getCalendarById($calendarId),
				'shares' => $this->getShares($calendarId),
				'add' => $add,
				'remove' => $remove,
			]));
		$this->sharingBackend->updateShares($shareable, $add, $remove);
	}

	/**
	 * @param int $resourceId
	 * @return array
	 */
	public function getShares($resourceId) {
		return $this->sharingBackend->getShares($resourceId);
	}

	/**
	 * @param boolean $value
	 * @param \OCA\DAV\CalDAV\Calendar $calendar
	 * @return string|null
	 */
	public function setPublishStatus($value, $calendar) {
		$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->execute();
			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->execute();
		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)))
			->execute();

		$row = $result->fetch();
		$result->closeCursor();
		return $row ? reset($row) : false;
	}

	/**
	 * @param int $resourceId
	 * @param array $acl
	 * @return array
	 */
	public function applyShareAcl($resourceId, $acl) {
		return $this->sharingBackend->applyShareAcl($resourceId, $acl);
	}



	/**
	 * update properties table
	 *
	 * @param int $calendarId
	 * @param string $objectUri
	 * @param string $calendarData
	 */
	public function updateProperties($calendarId, $objectUri, $calendarData) {
		$objectId = $this->getCalendarObjectId($calendarId, $objectUri);

		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),
					'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::$indexProperties)) {
					$value = $property->getValue();
					// is this a shitty db?
					if (!$this->db->supports4ByteText()) {
						$value = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $value);
					}
					$value = substr($value, 0, 254);

					$query->setParameter('name', $property->name);
					$query->setParameter('parameter', null);
					$query->setParameter('value', $value);
					$query->execute();
				}

				if (in_array($property->name, array_keys(self::$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);
							}
							$value = substr($value, 0, 254);

							$query->setParameter('name', $property->name);
							$query->setParameter('parameter', substr($key, 0, 254));
							$query->setParameter('value', substr($value, 0, 254));
							$query->execute();
						}
					}
				}
			}
		}
	}

	/**
	 * 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->execute();
	}

	/**
	 * get ID from a given calendar object
	 *
	 * @param int $calendarId
	 * @param string $uri
	 * @return int
	 */
	protected function getCalendarObjectId($calendarId, $uri) {
		$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)));

		$result = $query->execute();
		$objectIds = $result->fetch();
		$result->closeCursor();

		if (!isset($objectIds['id'])) {
			throw new \InvalidArgumentException('Calendarobject does not exists: ' . $uri);
		}

		return (int)$objectIds['id'];
	}

	private function convertPrincipal($principalUri, $toV2) {
		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
			list(, $name) = Uri\split($principalUri);
			if ($toV2 === true) {
				return "principals/users/$name";
			}
			return "principals/$name";
		}
		return $principalUri;
	}

	private function addOwnerPrincipal(&$calendarInfo) {
		$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'];
		}
	}
}

Push — master ( 44b423...f32fbb )

CalDavBackend::getSubscriptionsForUser() B

Complexity

Size

Duplication

Importance

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

nextcloud / server

Push — master ( 44b423...f32fbb )

CalDavBackend::getSubscriptionsForUser() B

Complexity

Size

Duplication

Importance

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

1. Missing dependencies

2. Missing use statement

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