nextcloud / server

apps/dav/lib/CalDAV/CalDavBackend.php

Braces +3 added lines, -1 removed lines

@@ -808,7 +808,9 @@
 		$stmt = $query->execute();
 		$row = $stmt->fetch(\PDO::FETCH_ASSOC);
 
-		if(!$row) return null;
+		if(!$row) {
+		    return null;
+		}
 
 		return [
 				'id'            => $row['id'],

Doc Comments +10 added lines, -4 removed lines

@@ -182,7 +182,7 @@ 
 	 *
 	 * By default this excludes the automatically generated birthday calendar
 	 *
-	 * @param $principalUri
+	 * @param string $principalUri
 	 * @param bool $excludeBirthday
 	 * @return int
 	 */
@@ -351,6 +351,9 @@ 
 		return array_values($calendars);
 	}
 
+	/**
+	 * @param string $principalUri
+	 */
 	public function getUsersOwnCalendars($principalUri) {
 		$principalUri = $this->convertPrincipal($principalUri, true);
 		$fields = array_values($this->propertyMap);
@@ -946,7 +949,7 @@ 
 	 * 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 integer $calendarId
 	 * @param string $objectUri
 	 * @param string $calendarData
 	 * @return string
@@ -1000,7 +1003,7 @@ 
 	 * 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 integer $calendarId
 	 * @param string $objectUri
 	 * @param string $calendarData
 	 * @return string
@@ -1563,7 +1566,7 @@ 
 	 * @param string $principalUri
 	 * @param string $uri
 	 * @param array $properties
-	 * @return mixed
+	 * @return integer
 	 */
 	function createSubscription($principalUri, $uri, array $properties) {
 
@@ -2103,6 +2106,9 @@ 
 		return (int)$objectIds['id'];
 	}
 
+	/**
+	 * @param boolean $toV2
+	 */
 	private function convertPrincipal($principalUri, $toV2) {
 		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
 			list(, $name) = Uri\split($principalUri);

Unused Use Statements -1 removed lines

@@ -45,7 +45,6 @@
 use Sabre\DAV\Exception\Forbidden;
 use Sabre\DAV\Exception\NotFound;
 use Sabre\DAV\PropPatch;
-use Sabre\HTTP\URLUtil;
 use Sabre\VObject\Component\VCalendar;
 use Sabre\VObject\DateTimeParser;
 use Sabre\VObject\Reader;

Spacing +121 added lines, -121 removed lines

@@ -197,7 +197,7 @@ 
 			$query->andWhere($query->expr()->neq('uri', $query->createNamedParameter(BirthdayService::BIRTHDAY_CALENDAR_URI)));
 		}
 
-		return (int)$query->execute()->fetchColumn();
+		return (int) $query->execute()->fetchColumn();
 	}
 
 	/**
@@ -244,25 +244,25 @@ 
 		$stmt = $query->execute();
 
 		$calendars = [];
-		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+		while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 
 			$components = [];
 			if ($row['components']) {
-				$components = explode(',',$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, !$this->legacyEndpoint),
+				'{'.Plugin::NS_CALENDARSERVER.'}getctag' => 'http://sabre.io/ns/sync/'.($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) {
+			foreach ($this->propertyMap as $xmlName=>$dbName) {
 				$calendar[$xmlName] = $row[$dbName];
 			}
 
@@ -280,7 +280,7 @@ 
 		$principals = array_map(function($principal) {
 			return urldecode($principal);
 		}, $principals);
-		$principals[]= $principalUri;
+		$principals[] = $principalUri;
 
 		$fields = array_values($this->propertyMap);
 		$fields[] = 'a.id';
@@ -300,8 +300,8 @@ 
 			->setParameter('principaluri', $principals, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY)
 			->execute();
 
-		$readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
-		while($row = $result->fetch()) {
+		$readOnlyPropertyName = '{'.\OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD.'}read-only';
+		while ($row = $result->fetch()) {
 			if ($row['principaluri'] === $principalUri) {
 				continue;
 			}
@@ -320,25 +320,25 @@ 
 			}
 
 			list(, $name) = Uri\split($row['principaluri']);
-			$uri = $row['uri'] . '_shared_by_' . $name;
-			$row['displayname'] = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
+			$uri = $row['uri'].'_shared_by_'.$name;
+			$row['displayname'] = $row['displayname'].' ('.$this->getUserDisplayName($name).')';
 			$components = [];
 			if ($row['components']) {
-				$components = explode(',',$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'], !$this->legacyEndpoint),
+				'{'.Plugin::NS_CALENDARSERVER.'}getctag' => 'http://sabre.io/ns/sync/'.($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) {
+			foreach ($this->propertyMap as $xmlName=>$dbName) {
 				$calendar[$xmlName] = $row[$dbName];
 			}
 
@@ -367,21 +367,21 @@ 
 			->orderBy('calendarorder', 'ASC');
 		$stmt = $query->execute();
 		$calendars = [];
-		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+		while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 			$components = [];
 			if ($row['components']) {
-				$components = explode(',',$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'),
+				'{'.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) {
+			foreach ($this->propertyMap as $xmlName=>$dbName) {
 				$calendar[$xmlName] = $row[$dbName];
 			}
 
@@ -432,27 +432,27 @@ 
 			->andWhere($query->expr()->eq('s.type', $query->createNamedParameter('calendar')))
 			->execute();
 
-		while($row = $result->fetch()) {
+		while ($row = $result->fetch()) {
 			list(, $name) = Uri\split($row['principaluri']);
-			$row['displayname'] = $row['displayname'] . "($name)";
+			$row['displayname'] = $row['displayname']."($name)";
 			$components = [];
 			if ($row['components']) {
-				$components = explode(',',$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)$row['access'] === self::ACCESS_PUBLIC,
+				'{'.Plugin::NS_CALENDARSERVER.'}getctag' => 'http://sabre.io/ns/sync/'.($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) {
+			foreach ($this->propertyMap as $xmlName=>$dbName) {
 				$calendar[$xmlName] = $row[$dbName];
 			}
 
@@ -496,29 +496,29 @@ 
 		$result->closeCursor();
 
 		if ($row === false) {
-			throw new NotFound('Node with name \'' . $uri . '\' could not be found');
+			throw new NotFound('Node with name \''.$uri.'\' could not be found');
 		}
 
 		list(, $name) = Uri\split($row['principaluri']);
-		$row['displayname'] = $row['displayname'] . ' ' . "($name)";
+		$row['displayname'] = $row['displayname'].' '."($name)";
 		$components = [];
 		if ($row['components']) {
-			$components = explode(',',$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)$row['access'] === self::ACCESS_PUBLIC,
+			'{'.Plugin::NS_CALENDARSERVER.'}getctag' => 'http://sabre.io/ns/sync/'.($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) {
+		foreach ($this->propertyMap as $xmlName=>$dbName) {
 			$calendar[$xmlName] = $row[$dbName];
 		}
 
@@ -558,20 +558,20 @@ 
 
 		$components = [];
 		if ($row['components']) {
-			$components = explode(',',$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'),
+			'{'.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) {
+		foreach ($this->propertyMap as $xmlName=>$dbName) {
 			$calendar[$xmlName] = $row[$dbName];
 		}
 
@@ -604,20 +604,20 @@ 
 
 		$components = [];
 		if ($row['components']) {
-			$components = explode(',',$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'),
+			'{'.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) {
+		foreach ($this->propertyMap as $xmlName=>$dbName) {
 			$calendar[$xmlName] = $row[$dbName];
 		}
 
@@ -652,16 +652,16 @@ 
 		$sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
 		if (isset($properties[$sccs])) {
 			if (!($properties[$sccs] instanceof SupportedCalendarComponentSet)) {
-				throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
+				throw new DAV\Exception('The '.$sccs.' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
 			}
-			$values['components'] = implode(',',$properties[$sccs]->getValue());
+			$values['components'] = implode(',', $properties[$sccs]->getValue());
 		}
-		$transp = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
+		$transp = '{'.Plugin::NS_CALDAV.'}schedule-calendar-transp';
 		if (isset($properties[$transp])) {
 			$values['transparent'] = (int) ($properties[$transp]->getValue() === 'transparent');
 		}
 
-		foreach($this->propertyMap as $xmlName=>$dbName) {
+		foreach ($this->propertyMap as $xmlName=>$dbName) {
 			if (isset($properties[$xmlName])) {
 				$values[$dbName] = $properties[$xmlName];
 			}
@@ -669,7 +669,7 @@ 
 
 		$query = $this->db->getQueryBuilder();
 		$query->insert('calendars');
-		foreach($values as $column => $value) {
+		foreach ($values as $column => $value) {
 			$query->setValue($column, $query->createNamedParameter($value));
 		}
 		$query->execute();
@@ -703,7 +703,7 @@ 
 	 */
 	function updateCalendar($calendarId, PropPatch $propPatch) {
 		$supportedProperties = array_keys($this->propertyMap);
-		$supportedProperties[] = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
+		$supportedProperties[] = '{'.Plugin::NS_CALDAV.'}schedule-calendar-transp';
 
 		/**
 		 * @suppress SqlInjectionChecker
@@ -713,7 +713,7 @@ 
 			foreach ($mutations as $propertyName => $propertyValue) {
 
 				switch ($propertyName) {
-					case '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp' :
+					case '{'.Plugin::NS_CALDAV.'}schedule-calendar-transp' :
 						$fieldName = 'transparent';
 						$newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
 						break;
@@ -828,16 +828,16 @@ 
 		$stmt = $query->execute();
 
 		$result = [];
-		foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
+		foreach ($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
 			$result[] = [
 					'id'           => $row['id'],
 					'uri'          => $row['uri'],
 					'lastmodified' => $row['lastmodified'],
-					'etag'         => '"' . $row['etag'] . '"',
+					'etag'         => '"'.$row['etag'].'"',
 					'calendarid'   => $row['calendarid'],
-					'size'         => (int)$row['size'],
+					'size'         => (int) $row['size'],
 					'component'    => strtolower($row['componenttype']),
-					'classification'=> (int)$row['classification']
+					'classification'=> (int) $row['classification']
 			];
 		}
 
@@ -870,18 +870,18 @@ 
 		$stmt = $query->execute();
 		$row = $stmt->fetch(\PDO::FETCH_ASSOC);
 
-		if(!$row) return null;
+		if (!$row) return null;
 
 		return [
 				'id'            => $row['id'],
 				'uri'           => $row['uri'],
 				'lastmodified'  => $row['lastmodified'],
-				'etag'          => '"' . $row['etag'] . '"',
+				'etag'          => '"'.$row['etag'].'"',
 				'calendarid'    => $row['calendarid'],
-				'size'          => (int)$row['size'],
+				'size'          => (int) $row['size'],
 				'calendardata'  => $this->readBlob($row['calendardata']),
 				'component'     => strtolower($row['componenttype']),
-				'classification'=> (int)$row['classification']
+				'classification'=> (int) $row['classification']
 		];
 	}
 
@@ -920,12 +920,12 @@ 
 					'id'           => $row['id'],
 					'uri'          => $row['uri'],
 					'lastmodified' => $row['lastmodified'],
-					'etag'         => '"' . $row['etag'] . '"',
+					'etag'         => '"'.$row['etag'].'"',
 					'calendarid'   => $row['calendarid'],
-					'size'         => (int)$row['size'],
+					'size'         => (int) $row['size'],
 					'calendardata' => $this->readBlob($row['calendardata']),
 					'component'    => strtolower($row['componenttype']),
-					'classification' => (int)$row['classification']
+					'classification' => (int) $row['classification']
 				];
 			}
 			$result->closeCursor();
@@ -984,7 +984,7 @@ 
 		));
 		$this->addChange($calendarId, $objectUri, 1);
 
-		return '"' . $extraData['etag'] . '"';
+		return '"'.$extraData['etag'].'"';
 	}
 
 	/**
@@ -1039,7 +1039,7 @@ 
 		}
 		$this->addChange($calendarId, $objectUri, 2);
 
-		return '"' . $extraData['etag'] . '"';
+		return '"'.$extraData['etag'].'"';
 	}
 
 	/**
@@ -1192,7 +1192,7 @@ 
 		$stmt = $query->execute();
 
 		$result = [];
-		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+		while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 			if ($requirePostFilter) {
 				if (!$this->validateFilterForObject($row, $filters)) {
 					continue;
@@ -1213,14 +1213,14 @@ 
 	 * @param integer|null $offset
 	 * @return array
 	 */
-	public function calendarSearch($principalUri, array $filters, $limit=null, $offset=null) {
+	public function calendarSearch($principalUri, array $filters, $limit = null, $offset = null) {
 		$calendars = $this->getCalendarsForUser($principalUri);
 		$ownCalendars = [];
 		$sharedCalendars = [];
 
 		$uriMapper = [];
 
-		foreach($calendars as $calendar) {
+		foreach ($calendars as $calendar) {
 			if ($calendar['{http://owncloud.org/ns}owner-principal'] === $principalUri) {
 				$ownCalendars[] = $calendar['id'];
 			} else {
@@ -1235,11 +1235,11 @@ 
 		$query = $this->db->getQueryBuilder();
 		// Calendar id expressions
 		$calendarExpressions = [];
-		foreach($ownCalendars as $id) {
+		foreach ($ownCalendars as $id) {
 			$calendarExpressions[] = $query->expr()
 				->eq('c.calendarid', $query->createNamedParameter($id));
 		}
-		foreach($sharedCalendars as $id) {
+		foreach ($sharedCalendars as $id) {
 			$calendarExpressions[] = $query->expr()->andX(
 				$query->expr()->eq('c.calendarid',
 					$query->createNamedParameter($id)),
@@ -1256,7 +1256,7 @@ 
 
 		// Component expressions
 		$compExpressions = [];
-		foreach($filters['comps'] as $comp) {
+		foreach ($filters['comps'] as $comp) {
 			$compExpressions[] = $query->expr()
 				->eq('c.componenttype', $query->createNamedParameter($comp));
 		}
@@ -1275,13 +1275,13 @@ 
 		}
 
 		$propParamExpressions = [];
-		foreach($filters['props'] as $prop) {
+		foreach ($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 $param) {
+		foreach ($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']))
@@ -1313,8 +1313,8 @@ 
 		$stmt = $query->execute();
 
 		$result = [];
-		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-			$path = $uriMapper[$row['calendarid']] . '/' . $row['uri'];
+		while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+			$path = $uriMapper[$row['calendarid']].'/'.$row['uri'];
 			if (!in_array($path, $result)) {
 				$result[] = $path;
 			}
@@ -1354,7 +1354,7 @@ 
 		$stmt = $query->execute();
 
 		if ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-			return $row['calendaruri'] . '/' . $row['objecturi'];
+			return $row['calendaruri'].'/'.$row['objecturi'];
 		}
 
 		return null;
@@ -1419,7 +1419,7 @@ 
 	function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null) {
 		// Current synctoken
 		$stmt = $this->db->prepare('SELECT `synctoken` FROM `*PREFIX*calendars` WHERE `id` = ?');
-		$stmt->execute([ $calendarId ]);
+		$stmt->execute([$calendarId]);
 		$currentToken = $stmt->fetchColumn(0);
 
 		if (is_null($currentToken)) {
@@ -1436,8 +1436,8 @@ 
 		if ($syncToken) {
 
 			$query = "SELECT `uri`, `operation` FROM `*PREFIX*calendarchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `calendarid` = ? ORDER BY `synctoken`";
-			if ($limit>0) {
-				$query.= " LIMIT " . (int)$limit;
+			if ($limit > 0) {
+				$query .= " LIMIT ".(int) $limit;
 			}
 
 			// Fetching all changes
@@ -1448,15 +1448,15 @@ 
 
 			// This loop ensures that any duplicates are overwritten, only the
 			// last change on a node is relevant.
-			while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+			while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 
 				$changes[$row['uri']] = $row['operation'];
 
 			}
 
-			foreach($changes as $uri => $operation) {
+			foreach ($changes as $uri => $operation) {
 
-				switch($operation) {
+				switch ($operation) {
 					case 1 :
 						$result['added'][] = $uri;
 						break;
@@ -1526,10 +1526,10 @@ 
 			->from('calendarsubscriptions')
 			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)))
 			->orderBy('calendarorder', 'asc');
-		$stmt =$query->execute();
+		$stmt = $query->execute();
 
 		$subscriptions = [];
-		while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+		while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 
 			$subscription = [
 				'id'           => $row['id'],
@@ -1538,10 +1538,10 @@ 
 				'source'       => $row['source'],
 				'lastmodified' => $row['lastmodified'],
 
-				'{' . Plugin::NS_CALDAV . '}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
+				'{'.Plugin::NS_CALDAV.'}supported-calendar-component-set' => new SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
 			];
 
-			foreach($this->subscriptionPropertyMap as $xmlName=>$dbName) {
+			foreach ($this->subscriptionPropertyMap as $xmlName=>$dbName) {
 				if (!is_null($row[$dbName])) {
 					$subscription[$xmlName] = $row[$dbName];
 				}
@@ -1580,7 +1580,7 @@ 
 
 		$propertiesBoolean = ['striptodos', 'stripalarms', 'stripattachments'];
 
-		foreach($this->subscriptionPropertyMap as $xmlName=>$dbName) {
+		foreach ($this->subscriptionPropertyMap as $xmlName=>$dbName) {
 			if (array_key_exists($xmlName, $properties)) {
 					$values[$dbName] = $properties[$xmlName];
 					if (in_array($dbName, $propertiesBoolean)) {
@@ -1631,7 +1631,7 @@ 
 
 			$newValues = [];
 
-			foreach($mutations as $propertyName=>$propertyValue) {
+			foreach ($mutations as $propertyName=>$propertyValue) {
 				if ($propertyName === '{http://calendarserver.org/ns/}source') {
 					$newValues['source'] = $propertyValue->getHref();
 				} else {
@@ -1643,7 +1643,7 @@ 
 			$query = $this->db->getQueryBuilder();
 			$query->update('calendarsubscriptions')
 				->set('lastmodified', $query->createNamedParameter(time()));
-			foreach($newValues as $fieldName=>$value) {
+			foreach ($newValues as $fieldName=>$value) {
 				$query->set($fieldName, $query->createNamedParameter($value));
 			}
 			$query->where($query->expr()->eq('id', $query->createNamedParameter($subscriptionId)))
@@ -1693,7 +1693,7 @@ 
 
 		$row = $stmt->fetch(\PDO::FETCH_ASSOC);
 
-		if(!$row) {
+		if (!$row) {
 			return null;
 		}
 
@@ -1701,8 +1701,8 @@ 
 				'uri'          => $row['uri'],
 				'calendardata' => $row['calendardata'],
 				'lastmodified' => $row['lastmodified'],
-				'etag'         => '"' . $row['etag'] . '"',
-				'size'         => (int)$row['size'],
+				'etag'         => '"'.$row['etag'].'"',
+				'size'         => (int) $row['size'],
 		];
 	}
 
@@ -1725,13 +1725,13 @@ 
 				->execute();
 
 		$result = [];
-		foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
+		foreach ($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
 			$result[] = [
 					'calendardata' => $row['calendardata'],
 					'uri'          => $row['uri'],
 					'lastmodified' => $row['lastmodified'],
-					'etag'         => '"' . $row['etag'] . '"',
-					'size'         => (int)$row['size'],
+					'etag'         => '"'.$row['etag'].'"',
+					'size'         => (int) $row['size'],
 			];
 		}
 
@@ -1823,10 +1823,10 @@ 
 		$lastOccurrence = null;
 		$uid = null;
 		$classification = self::CLASSIFICATION_PUBLIC;
-		foreach($vObject->getComponents() as $component) {
-			if ($component->name!=='VTIMEZONE') {
+		foreach ($vObject->getComponents() as $component) {
+			if ($component->name !== 'VTIMEZONE') {
 				$componentType = $component->name;
-				$uid = (string)$component->UID;
+				$uid = (string) $component->UID;
 				break;
 			}
 		}
@@ -1851,13 +1851,13 @@ 
 					$lastOccurrence = $firstOccurrence;
 				}
 			} else {
-				$it = new EventIterator($vObject, (string)$component->UID);
+				$it = new EventIterator($vObject, (string) $component->UID);
 				$maxDate = new \DateTime(self::MAX_DATE);
 				if ($it->isInfinite()) {
 					$lastOccurrence = $maxDate->getTimestamp();
 				} else {
 					$end = $it->getDtEnd();
-					while($it->valid() && $end < $maxDate) {
+					while ($it->valid() && $end < $maxDate) {
 						$end = $it->getDtEnd();
 						$it->next();
 
@@ -2097,10 +2097,10 @@ 
 		$result->closeCursor();
 
 		if (!isset($objectIds['id'])) {
-			throw new \InvalidArgumentException('Calendarobject does not exists: ' . $uri);
+			throw new \InvalidArgumentException('Calendarobject does not exists: '.$uri);
 		}
 
-		return (int)$objectIds['id'];
+		return (int) $objectIds['id'];
 	}
 
 	private function convertPrincipal($principalUri, $toV2) {
@@ -2115,8 +2115,8 @@ 
 	}
 
 	private function addOwnerPrincipal(&$calendarInfo) {
-		$ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
-		$displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
+		$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 {

Indentation +2066 added lines, -2066 removed lines

@@ -64,2071 +64,2071 @@
  */
 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];
-	}
+    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)) {
-				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' :
-						$fieldName = 'transparent';
-						$newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
-						break;
-					default :
-						$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);
-
-		$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) {
-			$query->setFirstResult($offset);
-		}
-		if ($limit) {
-			$query->setMaxResults($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;
-	}
-
-	/**
-	 * 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 :
-						$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.
-			$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'];
-		}
-	}
+    /**
+     * @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)) {
+                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' :
+                        $fieldName = 'transparent';
+                        $newValues[$fieldName] = (int) ($propertyValue->getValue() === 'transparent');
+                        break;
+                    default :
+                        $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);
+
+        $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) {
+            $query->setFirstResult($offset);
+        }
+        if ($limit) {
+            $query->setMaxResults($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;
+    }
+
+    /**
+     * 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 :
+                        $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.
+            $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'];
+        }
+    }
 }

apps/dav/lib/CalDAV/CalendarObject.php

Spacing +5 added lines, -5 removed lines

@@ -61,19 +61,19 @@
 
 		/** @var Component $vElement */
 		$vElement = null;
-		if(isset($vObject->VEVENT)) {
+		if (isset($vObject->VEVENT)) {
 			$vElement = $vObject->VEVENT;
 		}
-		if(isset($vObject->VJOURNAL)) {
+		if (isset($vObject->VJOURNAL)) {
 			$vElement = $vObject->VJOURNAL;
 		}
-		if(isset($vObject->VTODO)) {
+		if (isset($vObject->VTODO)) {
 			$vElement = $vObject->VTODO;
 		}
-		if(!is_null($vElement)) {
+		if (!is_null($vElement)) {
 			foreach ($vElement->children() as &$property) {
 				/** @var Property $property */
-				switch($property->name) {
+				switch ($property->name) {
 					case 'CREATED':
 					case 'DTSTART':
 					case 'RRULE':

Indentation +57 added lines, -57 removed lines

@@ -32,68 +32,68 @@
 
 class CalendarObject extends \Sabre\CalDAV\CalendarObject {
 
-	/**
-	 * @inheritdoc
-	 */
-	function get() {
-		$data = parent::get();
-		if ($this->isShared() && $this->objectData['classification'] === CalDavBackend::CLASSIFICATION_CONFIDENTIAL) {
-			return $this->createConfidentialObject($data);
-		}
-		return $data;
-	}
+    /**
+     * @inheritdoc
+     */
+    function get() {
+        $data = parent::get();
+        if ($this->isShared() && $this->objectData['classification'] === CalDavBackend::CLASSIFICATION_CONFIDENTIAL) {
+            return $this->createConfidentialObject($data);
+        }
+        return $data;
+    }
 
-	protected function isShared() {
-		if (!isset($this->calendarInfo['{http://owncloud.org/ns}owner-principal'])) {
-			return false;
-		}
+    protected function isShared() {
+        if (!isset($this->calendarInfo['{http://owncloud.org/ns}owner-principal'])) {
+            return false;
+        }
 
-		return $this->calendarInfo['{http://owncloud.org/ns}owner-principal'] !== $this->calendarInfo['principaluri'];
-	}
+        return $this->calendarInfo['{http://owncloud.org/ns}owner-principal'] !== $this->calendarInfo['principaluri'];
+    }
 
-	/**
-	 * @param string $calData
-	 * @return string
-	 */
-	private static function createConfidentialObject($calData) {
+    /**
+     * @param string $calData
+     * @return string
+     */
+    private static function createConfidentialObject($calData) {
 
-		$vObject = Reader::read($calData);
+        $vObject = Reader::read($calData);
 
-		/** @var Component $vElement */
-		$vElement = null;
-		if(isset($vObject->VEVENT)) {
-			$vElement = $vObject->VEVENT;
-		}
-		if(isset($vObject->VJOURNAL)) {
-			$vElement = $vObject->VJOURNAL;
-		}
-		if(isset($vObject->VTODO)) {
-			$vElement = $vObject->VTODO;
-		}
-		if(!is_null($vElement)) {
-			foreach ($vElement->children() as &$property) {
-				/** @var Property $property */
-				switch($property->name) {
-					case 'CREATED':
-					case 'DTSTART':
-					case 'RRULE':
-					case 'DURATION':
-					case 'DTEND':
-					case 'CLASS':
-					case 'UID':
-						break;
-					case 'SUMMARY':
-						$property->setValue('Busy');
-						break;
-					default:
-						$vElement->__unset($property->name);
-						unset($property);
-						break;
-				}
-			}
-		}
+        /** @var Component $vElement */
+        $vElement = null;
+        if(isset($vObject->VEVENT)) {
+            $vElement = $vObject->VEVENT;
+        }
+        if(isset($vObject->VJOURNAL)) {
+            $vElement = $vObject->VJOURNAL;
+        }
+        if(isset($vObject->VTODO)) {
+            $vElement = $vObject->VTODO;
+        }
+        if(!is_null($vElement)) {
+            foreach ($vElement->children() as &$property) {
+                /** @var Property $property */
+                switch($property->name) {
+                    case 'CREATED':
+                    case 'DTSTART':
+                    case 'RRULE':
+                    case 'DURATION':
+                    case 'DTEND':
+                    case 'CLASS':
+                    case 'UID':
+                        break;
+                    case 'SUMMARY':
+                        $property->setValue('Busy');
+                        break;
+                    default:
+                        $vElement->__unset($property->name);
+                        unset($property);
+                        break;
+                }
+            }
+        }
 		
-		return $vObject->serialize();
-	}
+        return $vObject->serialize();
+    }
 
 }

apps/dav/lib/CalDAV/Schedule/Plugin.php

Indentation +55 added lines, -55 removed lines

@@ -34,68 +34,68 @@
 
 class Plugin extends \Sabre\CalDAV\Schedule\Plugin {
 
-	/**
-	 * Initializes the plugin
-	 *
-	 * @param Server $server
-	 * @return void
-	 */
-	function initialize(Server $server) {
-		parent::initialize($server);
-		$server->on('propFind', [$this, 'propFindDefaultCalendarUrl'], 90);
-	}
+    /**
+     * Initializes the plugin
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+        parent::initialize($server);
+        $server->on('propFind', [$this, 'propFindDefaultCalendarUrl'], 90);
+    }
 
-	/**
-	 * Returns a list of addresses that are associated with a principal.
-	 *
-	 * @param string $principal
-	 * @return array
-	 */
-	protected function getAddressesForPrincipal($principal) {
-		$result = parent::getAddressesForPrincipal($principal);
+    /**
+     * Returns a list of addresses that are associated with a principal.
+     *
+     * @param string $principal
+     * @return array
+     */
+    protected function getAddressesForPrincipal($principal) {
+        $result = parent::getAddressesForPrincipal($principal);
 
-		if ($result === null) {
-			$result = [];
-		}
+        if ($result === null) {
+            $result = [];
+        }
 
-		return $result;
-	}
+        return $result;
+    }
 
-	/**
-	 * Always use the personal calendar as target for scheduled events
-	 *
-	 * @param PropFind $propFind
-	 * @param INode $node
-	 * @return void
-	 */
-	function propFindDefaultCalendarUrl(PropFind $propFind, INode $node) {
-		if ($node instanceof IPrincipal) {
-			$propFind->handle('{' . self::NS_CALDAV . '}schedule-default-calendar-URL', function() use ($node) {
-				/** @var \OCA\DAV\CalDAV\Plugin $caldavPlugin */
-				$caldavPlugin = $this->server->getPlugin('caldav');
-				$principalUrl = $node->getPrincipalUrl();
+    /**
+     * Always use the personal calendar as target for scheduled events
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFindDefaultCalendarUrl(PropFind $propFind, INode $node) {
+        if ($node instanceof IPrincipal) {
+            $propFind->handle('{' . self::NS_CALDAV . '}schedule-default-calendar-URL', function() use ($node) {
+                /** @var \OCA\DAV\CalDAV\Plugin $caldavPlugin */
+                $caldavPlugin = $this->server->getPlugin('caldav');
+                $principalUrl = $node->getPrincipalUrl();
 
-				$calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
+                $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
 
-				if (!$calendarHomePath) {
-					return null;
-				}
+                if (!$calendarHomePath) {
+                    return null;
+                }
 
-				/** @var CalendarHome $calendarHome */
-				$calendarHome = $this->server->tree->getNodeForPath($calendarHomePath);
-				if (!$calendarHome->childExists(CalDavBackend::PERSONAL_CALENDAR_URI)) {
-					$calendarHome->getCalDAVBackend()->createCalendar($principalUrl, CalDavBackend::PERSONAL_CALENDAR_URI, [
-						'{DAV:}displayname' => CalDavBackend::PERSONAL_CALENDAR_NAME,
-					]);
-				}
+                /** @var CalendarHome $calendarHome */
+                $calendarHome = $this->server->tree->getNodeForPath($calendarHomePath);
+                if (!$calendarHome->childExists(CalDavBackend::PERSONAL_CALENDAR_URI)) {
+                    $calendarHome->getCalDAVBackend()->createCalendar($principalUrl, CalDavBackend::PERSONAL_CALENDAR_URI, [
+                        '{DAV:}displayname' => CalDavBackend::PERSONAL_CALENDAR_NAME,
+                    ]);
+                }
 
-				$result = $this->server->getPropertiesForPath($calendarHomePath . '/' . CalDavBackend::PERSONAL_CALENDAR_URI, [], 1);
-				if (empty($result)) {
-					return null;
-				}
+                $result = $this->server->getPropertiesForPath($calendarHomePath . '/' . CalDavBackend::PERSONAL_CALENDAR_URI, [], 1);
+                if (empty($result)) {
+                    return null;
+                }
 
-				return new LocalHref($result[0]['href']);
-			});
-		}
-	}
+                return new LocalHref($result[0]['href']);
+            });
+        }
+    }
 }

Spacing +2 added lines, -2 removed lines

@@ -70,7 +70,7 @@ 
 	 */
 	function propFindDefaultCalendarUrl(PropFind $propFind, INode $node) {
 		if ($node instanceof IPrincipal) {
-			$propFind->handle('{' . self::NS_CALDAV . '}schedule-default-calendar-URL', function() use ($node) {
+			$propFind->handle('{'.self::NS_CALDAV.'}schedule-default-calendar-URL', function() use ($node) {
 				/** @var \OCA\DAV\CalDAV\Plugin $caldavPlugin */
 				$caldavPlugin = $this->server->getPlugin('caldav');
 				$principalUrl = $node->getPrincipalUrl();
@@ -89,7 +89,7 @@ 
 					]);
 				}
 
-				$result = $this->server->getPropertiesForPath($calendarHomePath . '/' . CalDavBackend::PERSONAL_CALENDAR_URI, [], 1);
+				$result = $this->server->getPropertiesForPath($calendarHomePath.'/'.CalDavBackend::PERSONAL_CALENDAR_URI, [], 1);
 				if (empty($result)) {
 					return null;
 				}

apps/dav/lib/CalDAV/Publishing/Xml/Publisher.php

Indentation +50 added lines, -50 removed lines

@@ -26,58 +26,58 @@
 
 class Publisher implements XmlSerializable {
 
-	/**
-	 * @var string $publishUrl
-	 */
-	protected $publishUrl;
+    /**
+     * @var string $publishUrl
+     */
+    protected $publishUrl;
 
-	/**
-	 * @var boolean $isPublished
-	 */
-	protected $isPublished;
+    /**
+     * @var boolean $isPublished
+     */
+    protected $isPublished;
 
-	/**
-	 * @param string $publishUrl
-	 * @param boolean $isPublished
-	 */
-	function __construct($publishUrl, $isPublished) {
-		$this->publishUrl = $publishUrl;
-		$this->isPublished = $isPublished;
-	}
+    /**
+     * @param string $publishUrl
+     * @param boolean $isPublished
+     */
+    function __construct($publishUrl, $isPublished) {
+        $this->publishUrl = $publishUrl;
+        $this->isPublished = $isPublished;
+    }
 
-	/**
-	 * @return string
-	 */
-	function getValue() {
-		return $this->publishUrl;
-	}
+    /**
+     * @return string
+     */
+    function getValue() {
+        return $this->publishUrl;
+    }
 
-	/**
-	 * The xmlSerialize metod is called during xml writing.
-	 *
-	 * Use the $writer argument to write its own xml serialization.
-	 *
-	 * An important note: do _not_ create a parent element. Any element
-	 * implementing XmlSerializble should only ever write what's considered
-	 * its 'inner xml'.
-	 *
-	 * The parent of the current element is responsible for writing a
-	 * containing element.
-	 *
-	 * This allows serializers to be re-used for different element names.
-	 *
-	 * If you are opening new elements, you must also close them again.
-	 *
-	 * @param Writer $writer
-	 * @return void
-	 */
-	function xmlSerialize(Writer $writer) {
-		if (!$this->isPublished) {
-			// for pre-publish-url
-			$writer->write($this->publishUrl);
-		} else {
-			// for publish-url
-			$writer->writeElement('{DAV:}href', $this->publishUrl);
-		}
-	}
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+        if (!$this->isPublished) {
+            // for pre-publish-url
+            $writer->write($this->publishUrl);
+        } else {
+            // for publish-url
+            $writer->writeElement('{DAV:}href', $this->publishUrl);
+        }
+    }
 }

apps/dav/lib/CalDAV/CalendarRoot.php

Indentation +3 added lines, -3 removed lines

@@ -24,7 +24,7 @@
 
 class CalendarRoot extends \Sabre\CalDAV\CalendarRoot {
 
-	function getChildForPrincipal(array $principal) {
-		return new CalendarHome($this->caldavBackend, $principal);
-	}
+    function getChildForPrincipal(array $principal) {
+        return new CalendarHome($this->caldavBackend, $principal);
+    }
 }
\ No newline at end of file

apps/dav/lib/CardDAV/AddressBookImpl.php

Indentation +251 added lines, -251 removed lines

@@ -34,255 +34,255 @@
 
 class AddressBookImpl implements IAddressBook {
 
-	/** @var CardDavBackend */
-	private $backend;
-
-	/** @var array */
-	private $addressBookInfo;
-
-	/** @var AddressBook */
-	private $addressBook;
-
-	/** @var IURLGenerator */
-	private $urlGenerator;
-
-	/**
-	 * AddressBookImpl constructor.
-	 *
-	 * @param AddressBook $addressBook
-	 * @param array $addressBookInfo
-	 * @param CardDavBackend $backend
-	 * @param IUrlGenerator $urlGenerator
-	 */
-	public function __construct(
-			AddressBook $addressBook,
-			array $addressBookInfo,
-			CardDavBackend $backend,
-			IURLGenerator $urlGenerator) {
-
-		$this->addressBook = $addressBook;
-		$this->addressBookInfo = $addressBookInfo;
-		$this->backend = $backend;
-		$this->urlGenerator = $urlGenerator;
-	}
-
-	/**
-	 * @return string defining the technical unique key
-	 * @since 5.0.0
-	 */
-	public function getKey() {
-		return $this->addressBookInfo['id'];
-	}
-
-	/**
-	 * In comparison to getKey() this function returns a human readable (maybe translated) name
-	 *
-	 * @return mixed
-	 * @since 5.0.0
-	 */
-	public function getDisplayName() {
-		return $this->addressBookInfo['{DAV:}displayname'];
-	}
-
-	/**
-	 * @param string $pattern which should match within the $searchProperties
-	 * @param array $searchProperties defines the properties within the query pattern should match
-	 * @param array $options - for future use. One should always have options!
-	 * @return array an array of contacts which are arrays of key-value-pairs
-	 * @since 5.0.0
-	 */
-	public function search($pattern, $searchProperties, $options) {
-		$results = $this->backend->search($this->getKey(), $pattern, $searchProperties);
-
-		$vCards = [];
-		foreach ($results as $result) {
-			$vCards[] = $this->vCard2Array($result['uri'], $this->readCard($result['carddata']));
-		}
-
-		return $vCards;
-	}
-
-	/**
-	 * @param array $properties this array if key-value-pairs defines a contact
-	 * @return array an array representing the contact just created or updated
-	 * @since 5.0.0
-	 */
-	public function createOrUpdate($properties) {
-		$update = false;
-		if (!isset($properties['URI'])) { // create a new contact
-			$uid = $this->createUid();
-			$uri = $uid . '.vcf';
-			$vCard = $this->createEmptyVCard($uid);
-		} else { // update existing contact
-			$uri = $properties['URI'];
-			$vCardData = $this->backend->getCard($this->getKey(), $uri);
-			$vCard = $this->readCard($vCardData['carddata']);
-			$update = true;
-		}
-
-		foreach ($properties as $key => $value) {
-			$vCard->$key = $vCard->createProperty($key, $value);
-		}
-
-		if ($update) {
-			$this->backend->updateCard($this->getKey(), $uri, $vCard->serialize());
-		} else {
-			$this->backend->createCard($this->getKey(), $uri, $vCard->serialize());
-		}
-
-		return $this->vCard2Array($uri, $vCard);
-
-	}
-
-	/**
-	 * @return mixed
-	 * @since 5.0.0
-	 */
-	public function getPermissions() {
-		$permissions = $this->addressBook->getACL();
-		$result = 0;
-		foreach ($permissions as $permission) {
-			switch($permission['privilege']) {
-				case '{DAV:}read':
-					$result |= Constants::PERMISSION_READ;
-					break;
-				case '{DAV:}write':
-					$result |= Constants::PERMISSION_CREATE;
-					$result |= Constants::PERMISSION_UPDATE;
-					break;
-				case '{DAV:}all':
-					$result |= Constants::PERMISSION_ALL;
-					break;
-			}
-		}
-
-		return $result;
-	}
-
-	/**
-	 * @param object $id the unique identifier to a contact
-	 * @return bool successful or not
-	 * @since 5.0.0
-	 */
-	public function delete($id) {
-		$uri = $this->backend->getCardUri($id);
-		return $this->backend->deleteCard($this->addressBookInfo['id'], $uri);
-	}
-
-	/**
-	 * read vCard data into a vCard object
-	 *
-	 * @param string $cardData
-	 * @return VCard
-	 */
-	protected function readCard($cardData) {
-		return  Reader::read($cardData);
-	}
-
-	/**
-	 * create UID for contact
-	 *
-	 * @return string
-	 */
-	protected function createUid() {
-		do {
-			$uid = $this->getUid();
-			$contact = $this->backend->getContact($this->getKey(), $uid . '.vcf');
-		} while (!empty($contact));
-
-		return $uid;
-	}
-
-	/**
-	 * getUid is only there for testing, use createUid instead
-	 */
-	protected function getUid() {
-		return UUIDUtil::getUUID();
-	}
-
-	/**
-	 * create empty vcard
-	 *
-	 * @param string $uid
-	 * @return VCard
-	 */
-	protected function createEmptyVCard($uid) {
-		$vCard = new VCard();
-		$vCard->UID = $uid;
-		return $vCard;
-	}
-
-	/**
-	 * create array with all vCard properties
-	 *
-	 * @param string $uri
-	 * @param VCard $vCard
-	 * @return array
-	 */
-	protected function vCard2Array($uri, VCard $vCard) {
-		$result = [
-			'URI' => $uri,
-		];
-
-		foreach ($vCard->children() as $property) {
-			if ($property->name === 'PHOTO' && $property->getValueType() === 'BINARY') {
-				$url = $this->urlGenerator->getAbsoluteURL(
-					$this->urlGenerator->linkTo('', 'remote.php') . '/dav/');
-				$url .= implode('/', [
-					'addressbooks',
-					substr($this->addressBookInfo['principaluri'], 11), //cut off 'principals/'
-					$this->addressBookInfo['uri'],
-					$uri
-				]) . '?photo';
-
-				$result['PHOTO'] = 'VALUE=uri:' . $url;
-
-			} else if ($property->name === 'X-SOCIALPROFILE') {
-				$type = $this->getTypeFromProperty($property);
-
-				// Type is the social network, when it's empty we don't need this.
-				if ($type !== null) {
-					if (!isset($result[$property->name])) {
-						$result[$property->name] = [];
-					}
-					$result[$property->name][$type] = $property->getValue();
-				}
-
-			// The following properties can be set multiple times
-			} else if (in_array($property->name, ['CLOUD', 'EMAIL', 'IMPP', 'TEL', 'URL'])) {
-				if (!isset($result[$property->name])) {
-					$result[$property->name] = [];
-				}
-
-				$result[$property->name][] = $property->getValue();
-
-			} else {
-				$result[$property->name] = $property->getValue();
-			}
-		}
-
-		if ($this->addressBookInfo['principaluri'] === 'principals/system/system' &&
-			$this->addressBookInfo['uri'] === 'system') {
-			$result['isLocalSystemBook'] = true;
-		}
-		return $result;
-	}
-
-	/**
-	 * Get the type of the current property
-	 *
-	 * @param Property $property
-	 * @return null|string
-	 */
-	protected function getTypeFromProperty(Property $property) {
-		$parameters = $property->parameters();
-		// Type is the social network, when it's empty we don't need this.
-		if (isset($parameters['TYPE'])) {
-			/** @var \Sabre\VObject\Parameter $type */
-			$type = $parameters['TYPE'];
-			return $type->getValue();
-		}
-
-		return null;
-	}
+    /** @var CardDavBackend */
+    private $backend;
+
+    /** @var array */
+    private $addressBookInfo;
+
+    /** @var AddressBook */
+    private $addressBook;
+
+    /** @var IURLGenerator */
+    private $urlGenerator;
+
+    /**
+     * AddressBookImpl constructor.
+     *
+     * @param AddressBook $addressBook
+     * @param array $addressBookInfo
+     * @param CardDavBackend $backend
+     * @param IUrlGenerator $urlGenerator
+     */
+    public function __construct(
+            AddressBook $addressBook,
+            array $addressBookInfo,
+            CardDavBackend $backend,
+            IURLGenerator $urlGenerator) {
+
+        $this->addressBook = $addressBook;
+        $this->addressBookInfo = $addressBookInfo;
+        $this->backend = $backend;
+        $this->urlGenerator = $urlGenerator;
+    }
+
+    /**
+     * @return string defining the technical unique key
+     * @since 5.0.0
+     */
+    public function getKey() {
+        return $this->addressBookInfo['id'];
+    }
+
+    /**
+     * In comparison to getKey() this function returns a human readable (maybe translated) name
+     *
+     * @return mixed
+     * @since 5.0.0
+     */
+    public function getDisplayName() {
+        return $this->addressBookInfo['{DAV:}displayname'];
+    }
+
+    /**
+     * @param string $pattern which should match within the $searchProperties
+     * @param array $searchProperties defines the properties within the query pattern should match
+     * @param array $options - for future use. One should always have options!
+     * @return array an array of contacts which are arrays of key-value-pairs
+     * @since 5.0.0
+     */
+    public function search($pattern, $searchProperties, $options) {
+        $results = $this->backend->search($this->getKey(), $pattern, $searchProperties);
+
+        $vCards = [];
+        foreach ($results as $result) {
+            $vCards[] = $this->vCard2Array($result['uri'], $this->readCard($result['carddata']));
+        }
+
+        return $vCards;
+    }
+
+    /**
+     * @param array $properties this array if key-value-pairs defines a contact
+     * @return array an array representing the contact just created or updated
+     * @since 5.0.0
+     */
+    public function createOrUpdate($properties) {
+        $update = false;
+        if (!isset($properties['URI'])) { // create a new contact
+            $uid = $this->createUid();
+            $uri = $uid . '.vcf';
+            $vCard = $this->createEmptyVCard($uid);
+        } else { // update existing contact
+            $uri = $properties['URI'];
+            $vCardData = $this->backend->getCard($this->getKey(), $uri);
+            $vCard = $this->readCard($vCardData['carddata']);
+            $update = true;
+        }
+
+        foreach ($properties as $key => $value) {
+            $vCard->$key = $vCard->createProperty($key, $value);
+        }
+
+        if ($update) {
+            $this->backend->updateCard($this->getKey(), $uri, $vCard->serialize());
+        } else {
+            $this->backend->createCard($this->getKey(), $uri, $vCard->serialize());
+        }
+
+        return $this->vCard2Array($uri, $vCard);
+
+    }
+
+    /**
+     * @return mixed
+     * @since 5.0.0
+     */
+    public function getPermissions() {
+        $permissions = $this->addressBook->getACL();
+        $result = 0;
+        foreach ($permissions as $permission) {
+            switch($permission['privilege']) {
+                case '{DAV:}read':
+                    $result |= Constants::PERMISSION_READ;
+                    break;
+                case '{DAV:}write':
+                    $result |= Constants::PERMISSION_CREATE;
+                    $result |= Constants::PERMISSION_UPDATE;
+                    break;
+                case '{DAV:}all':
+                    $result |= Constants::PERMISSION_ALL;
+                    break;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * @param object $id the unique identifier to a contact
+     * @return bool successful or not
+     * @since 5.0.0
+     */
+    public function delete($id) {
+        $uri = $this->backend->getCardUri($id);
+        return $this->backend->deleteCard($this->addressBookInfo['id'], $uri);
+    }
+
+    /**
+     * read vCard data into a vCard object
+     *
+     * @param string $cardData
+     * @return VCard
+     */
+    protected function readCard($cardData) {
+        return  Reader::read($cardData);
+    }
+
+    /**
+     * create UID for contact
+     *
+     * @return string
+     */
+    protected function createUid() {
+        do {
+            $uid = $this->getUid();
+            $contact = $this->backend->getContact($this->getKey(), $uid . '.vcf');
+        } while (!empty($contact));
+
+        return $uid;
+    }
+
+    /**
+     * getUid is only there for testing, use createUid instead
+     */
+    protected function getUid() {
+        return UUIDUtil::getUUID();
+    }
+
+    /**
+     * create empty vcard
+     *
+     * @param string $uid
+     * @return VCard
+     */
+    protected function createEmptyVCard($uid) {
+        $vCard = new VCard();
+        $vCard->UID = $uid;
+        return $vCard;
+    }
+
+    /**
+     * create array with all vCard properties
+     *
+     * @param string $uri
+     * @param VCard $vCard
+     * @return array
+     */
+    protected function vCard2Array($uri, VCard $vCard) {
+        $result = [
+            'URI' => $uri,
+        ];
+
+        foreach ($vCard->children() as $property) {
+            if ($property->name === 'PHOTO' && $property->getValueType() === 'BINARY') {
+                $url = $this->urlGenerator->getAbsoluteURL(
+                    $this->urlGenerator->linkTo('', 'remote.php') . '/dav/');
+                $url .= implode('/', [
+                    'addressbooks',
+                    substr($this->addressBookInfo['principaluri'], 11), //cut off 'principals/'
+                    $this->addressBookInfo['uri'],
+                    $uri
+                ]) . '?photo';
+
+                $result['PHOTO'] = 'VALUE=uri:' . $url;
+
+            } else if ($property->name === 'X-SOCIALPROFILE') {
+                $type = $this->getTypeFromProperty($property);
+
+                // Type is the social network, when it's empty we don't need this.
+                if ($type !== null) {
+                    if (!isset($result[$property->name])) {
+                        $result[$property->name] = [];
+                    }
+                    $result[$property->name][$type] = $property->getValue();
+                }
+
+            // The following properties can be set multiple times
+            } else if (in_array($property->name, ['CLOUD', 'EMAIL', 'IMPP', 'TEL', 'URL'])) {
+                if (!isset($result[$property->name])) {
+                    $result[$property->name] = [];
+                }
+
+                $result[$property->name][] = $property->getValue();
+
+            } else {
+                $result[$property->name] = $property->getValue();
+            }
+        }
+
+        if ($this->addressBookInfo['principaluri'] === 'principals/system/system' &&
+            $this->addressBookInfo['uri'] === 'system') {
+            $result['isLocalSystemBook'] = true;
+        }
+        return $result;
+    }
+
+    /**
+     * Get the type of the current property
+     *
+     * @param Property $property
+     * @return null|string
+     */
+    protected function getTypeFromProperty(Property $property) {
+        $parameters = $property->parameters();
+        // Type is the social network, when it's empty we don't need this.
+        if (isset($parameters['TYPE'])) {
+            /** @var \Sabre\VObject\Parameter $type */
+            $type = $parameters['TYPE'];
+            return $type->getValue();
+        }
+
+        return null;
+    }
 }

Spacing +6 added lines, -6 removed lines

@@ -111,7 +111,7 @@ 
 		$update = false;
 		if (!isset($properties['URI'])) { // create a new contact
 			$uid = $this->createUid();
-			$uri = $uid . '.vcf';
+			$uri = $uid.'.vcf';
 			$vCard = $this->createEmptyVCard($uid);
 		} else { // update existing contact
 			$uri = $properties['URI'];
@@ -142,7 +142,7 @@ 
 		$permissions = $this->addressBook->getACL();
 		$result = 0;
 		foreach ($permissions as $permission) {
-			switch($permission['privilege']) {
+			switch ($permission['privilege']) {
 				case '{DAV:}read':
 					$result |= Constants::PERMISSION_READ;
 					break;
@@ -187,7 +187,7 @@ 
 	protected function createUid() {
 		do {
 			$uid = $this->getUid();
-			$contact = $this->backend->getContact($this->getKey(), $uid . '.vcf');
+			$contact = $this->backend->getContact($this->getKey(), $uid.'.vcf');
 		} while (!empty($contact));
 
 		return $uid;
@@ -227,15 +227,15 @@ 
 		foreach ($vCard->children() as $property) {
 			if ($property->name === 'PHOTO' && $property->getValueType() === 'BINARY') {
 				$url = $this->urlGenerator->getAbsoluteURL(
-					$this->urlGenerator->linkTo('', 'remote.php') . '/dav/');
+					$this->urlGenerator->linkTo('', 'remote.php').'/dav/');
 				$url .= implode('/', [
 					'addressbooks',
 					substr($this->addressBookInfo['principaluri'], 11), //cut off 'principals/'
 					$this->addressBookInfo['uri'],
 					$uri
-				]) . '?photo';
+				]).'?photo';
 
-				$result['PHOTO'] = 'VALUE=uri:' . $url;
+				$result['PHOTO'] = 'VALUE=uri:'.$url;
 
 			} else if ($property->name === 'X-SOCIALPROFILE') {
 				$type = $this->getTypeFromProperty($property);

apps/dav/lib/CardDAV/Xml/Groups.php

Indentation +14 added lines, -14 removed lines

@@ -26,21 +26,21 @@
 use Sabre\Xml\Writer;
 
 class Groups implements XmlSerializable {
-	const NS_OWNCLOUD = 'http://owncloud.org/ns';
+    const NS_OWNCLOUD = 'http://owncloud.org/ns';
 
-	/** @var string[] of TYPE:CHECKSUM */
-	private $groups;
+    /** @var string[] of TYPE:CHECKSUM */
+    private $groups;
 
-	/**
-	 * @param string $groups
-	 */
-	public function __construct($groups) {
-		$this->groups = $groups;
-	}
+    /**
+     * @param string $groups
+     */
+    public function __construct($groups) {
+        $this->groups = $groups;
+    }
 
-	function xmlSerialize(Writer $writer) {
-		foreach ($this->groups as $group) {
-			$writer->writeElement('{' . self::NS_OWNCLOUD . '}group', $group);
-		}
-	}
+    function xmlSerialize(Writer $writer) {
+        foreach ($this->groups as $group) {
+            $writer->writeElement('{' . self::NS_OWNCLOUD . '}group', $group);
+        }
+    }
 }

Spacing +1 added lines, -1 removed lines

@@ -40,7 +40,7 @@
 
 	function xmlSerialize(Writer $writer) {
 		foreach ($this->groups as $group) {
-			$writer->writeElement('{' . self::NS_OWNCLOUD . '}group', $group);
+			$writer->writeElement('{'.self::NS_OWNCLOUD.'}group', $group);
 		}
 	}
 }

apps/dav/lib/CardDAV/CardDavBackend.php

Braces +3 added lines, -1 removed lines

@@ -745,7 +745,9 @@
 		$stmt->execute([ $addressBookId ]);
 		$currentToken = $stmt->fetchColumn(0);
 
-		if (is_null($currentToken)) return null;
+		if (is_null($currentToken)) {
+		    return null;
+		}
 
 		$result = [
 			'syncToken' => $currentToken,

Doc Comments +11 added lines, -3 removed lines

@@ -104,7 +104,7 @@ 
 	/**
 	 * Return the number of address books for a principal
 	 *
-	 * @param $principalUri
+	 * @param string $principalUri
 	 * @return int
 	 */
 	public function getAddressBooksForUserCount($principalUri) {
@@ -219,6 +219,9 @@ 
 		return array_values($addressBooks);
 	}
 
+	/**
+	 * @param string $principalUri
+	 */
 	public function getUsersOwnAddressBooks($principalUri) {
 		$principalUri = $this->convertPrincipal($principalUri, true);
 		$query = $this->db->getQueryBuilder();
@@ -293,7 +296,8 @@ 
 	}
 
 	/**
-	 * @param $addressBookUri
+	 * @param string $addressBookUri
+	 * @param string $principal
 	 * @return array|null
 	 */
 	public function getAddressBooksByUri($principal, $addressBookUri) {
@@ -982,6 +986,7 @@ 
 	 *   * readOnly - boolean
 	 *   * summary - Optional, a description for the share
 	 *
+	 * @param integer $addressBookId
 	 * @return array
 	 */
 	public function getShares($addressBookId) {
@@ -1081,7 +1086,7 @@ 
 
 	/**
 	 * For shared address books the sharee is set in the ACL of the address book
-	 * @param $addressBookId
+	 * @param integer $addressBookId
 	 * @param $acl
 	 * @return array
 	 */
@@ -1089,6 +1094,9 @@ 
 		return $this->sharingBackend->applyShareAcl($addressBookId, $acl);
 	}
 
+	/**
+	 * @param boolean $toV2
+	 */
 	private function convertPrincipal($principalUri, $toV2) {
 		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
 			list(, $name) = \Sabre\Uri\split($principalUri);

Unused Use Statements -1 removed lines

@@ -40,7 +40,6 @@
 use Sabre\CardDAV\Backend\SyncSupport;
 use Sabre\CardDAV\Plugin;
 use Sabre\DAV\Exception\BadRequest;
-use Sabre\HTTP\URLUtil;
 use Sabre\VObject\Component\VCard;
 use Sabre\VObject\Reader;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;

Spacing +49 added lines, -49 removed lines

@@ -114,7 +114,7 @@ 
 			->from('addressbooks')
 			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
 
-		return (int)$query->execute()->fetchColumn();
+		return (int) $query->execute()->fetchColumn();
 	}
 
 	/**
@@ -145,15 +145,15 @@ 
 		$addressBooks = [];
 
 		$result = $query->execute();
-		while($row = $result->fetch()) {
+		while ($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'],
+				'{'.Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
 				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ? $row['synctoken'] : '0',
 			];
 
 			$this->addOwnerPrincipal($addressBooks[$row['id']]);
@@ -165,7 +165,7 @@ 
 		$principals = array_map(function($principal) {
 			return urldecode($principal);
 		}, $principals);
-		$principals[]= $principalUri;
+		$principals[] = $principalUri;
 
 		$query = $this->db->getQueryBuilder();
 		$result = $query->select(['a.id', 'a.uri', 'a.displayname', 'a.principaluri', 'a.description', 'a.synctoken', 's.access'])
@@ -177,8 +177,8 @@ 
 			->setParameter('principaluri', $principals, IQueryBuilder::PARAM_STR_ARRAY)
 			->execute();
 
-		$readOnlyPropertyName = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}read-only';
-		while($row = $result->fetch()) {
+		$readOnlyPropertyName = '{'.\OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD.'}read-only';
+		while ($row = $result->fetch()) {
 			if ($row['principaluri'] === $principalUri) {
 				continue;
 			}
@@ -197,18 +197,18 @@ 
 			}
 
 			list(, $name) = \Sabre\Uri\split($row['principaluri']);
-			$uri = $row['uri'] . '_shared_by_' . $name;
-			$displayName = $row['displayname'] . ' (' . $this->getUserDisplayName($name) . ')';
+			$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'],
+				'{'.Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
 				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
-				'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal' => $row['principaluri'],
+				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ? $row['synctoken'] : '0',
+				'{'.\OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD.'}owner-principal' => $row['principaluri'],
 				$readOnlyPropertyName => $readOnly,
 			];
 
@@ -229,15 +229,15 @@ 
 		$addressBooks = [];
 
 		$result = $query->execute();
-		while($row = $result->fetch()) {
+		while ($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'],
+				'{'.Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
 				'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-				'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+				'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ? $row['synctoken'] : '0',
 			];
 
 			$this->addOwnerPrincipal($addressBooks[$row['id']]);
@@ -282,9 +282,9 @@ 
 			'uri' => $row['uri'],
 			'principaluri' => $row['principaluri'],
 			'{DAV:}displayname' => $row['displayname'],
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+			'{'.Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
 			'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+			'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ? $row['synctoken'] : '0',
 		];
 
 		$this->addOwnerPrincipal($addressBook);
@@ -316,9 +316,9 @@ 
 			'uri' => $row['uri'],
 			'principaluri' => $row['principaluri'],
 			'{DAV:}displayname' => $row['displayname'],
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+			'{'.Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
 			'{http://calendarserver.org/ns/}getctag' => $row['synctoken'],
-			'{http://sabredav.org/ns}sync-token' => $row['synctoken']?$row['synctoken']:'0',
+			'{http://sabredav.org/ns}sync-token' => $row['synctoken'] ? $row['synctoken'] : '0',
 		];
 
 		$this->addOwnerPrincipal($addressBook);
@@ -345,7 +345,7 @@ 
 	function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
 		$supportedProperties = [
 			'{DAV:}displayname',
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description',
+			'{'.Plugin::NS_CARDDAV.'}addressbook-description',
 		];
 
 		/**
@@ -354,13 +354,13 @@ 
 		$propPatch->handle($supportedProperties, function($mutations) use ($addressBookId) {
 
 			$updates = [];
-			foreach($mutations as $property=>$newValue) {
+			foreach ($mutations as $property=>$newValue) {
 
-				switch($property) {
+				switch ($property) {
 					case '{DAV:}displayname' :
 						$updates['displayname'] = $newValue;
 						break;
-					case '{' . Plugin::NS_CARDDAV . '}addressbook-description' :
+					case '{'.Plugin::NS_CARDDAV.'}addressbook-description' :
 						$updates['description'] = $newValue;
 						break;
 				}
@@ -368,7 +368,7 @@ 
 			$query = $this->db->getQueryBuilder();
 			$query->update('addressbooks');
 
-			foreach($updates as $key=>$value) {
+			foreach ($updates as $key=>$value) {
 				$query->set($key, $query->createNamedParameter($value));
 			}
 			$query->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId)))
@@ -399,24 +399,24 @@ 
 			'synctoken' => 1
 		];
 
-		foreach($properties as $property=>$newValue) {
+		foreach ($properties as $property=>$newValue) {
 
-			switch($property) {
+			switch ($property) {
 				case '{DAV:}displayname' :
 					$values['displayname'] = $newValue;
 					break;
-				case '{' . Plugin::NS_CARDDAV . '}addressbook-description' :
+				case '{'.Plugin::NS_CARDDAV.'}addressbook-description' :
 					$values['description'] = $newValue;
 					break;
 				default :
-					throw new BadRequest('Unknown property: ' . $property);
+					throw new BadRequest('Unknown property: '.$property);
 			}
 
 		}
 
 		// Fallback to make sure the displayname is set. Some clients may refuse
 		// to work with addressbooks not having a displayname.
-		if(is_null($values['displayname'])) {
+		if (is_null($values['displayname'])) {
 			$values['displayname'] = $url;
 		}
 
@@ -494,8 +494,8 @@ 
 		$cards = [];
 
 		$result = $query->execute();
-		while($row = $result->fetch()) {
-			$row['etag'] = '"' . $row['etag'] . '"';
+		while ($row = $result->fetch()) {
+			$row['etag'] = '"'.$row['etag'].'"';
 			$row['carddata'] = $this->readBlob($row['carddata']);
 			$cards[] = $row;
 		}
@@ -529,7 +529,7 @@ 
 		if (!$row) {
 			return false;
 		}
-		$row['etag'] = '"' . $row['etag'] . '"';
+		$row['etag'] = '"'.$row['etag'].'"';
 		$row['carddata'] = $this->readBlob($row['carddata']);
 
 		return $row;
@@ -566,7 +566,7 @@ 
 			$result = $query->execute();
 
 			while ($row = $result->fetch()) {
-				$row['etag'] = '"' . $row['etag'] . '"';
+				$row['etag'] = '"'.$row['etag'].'"';
 				$row['carddata'] = $this->readBlob($row['carddata']);
 				$cards[] = $row;
 			}
@@ -624,7 +624,7 @@ 
 				'cardUri' => $cardUri,
 				'cardData' => $cardData]));
 
-		return '"' . $etag . '"';
+		return '"'.$etag.'"';
 	}
 
 	/**
@@ -674,7 +674,7 @@ 
 				'cardUri' => $cardUri,
 				'cardData' => $cardData]));
 
-		return '"' . $etag . '"';
+		return '"'.$etag.'"';
 	}
 
 	/**
@@ -772,7 +772,7 @@ 
 	function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
 		// Current synctoken
 		$stmt = $this->db->prepare('SELECT `synctoken` FROM `*PREFIX*addressbooks` WHERE `id` = ?');
-		$stmt->execute([ $addressBookId ]);
+		$stmt->execute([$addressBookId]);
 		$currentToken = $stmt->fetchColumn(0);
 
 		if (is_null($currentToken)) return null;
@@ -787,8 +787,8 @@ 
 		if ($syncToken) {
 
 			$query = "SELECT `uri`, `operation` FROM `*PREFIX*addressbookchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `addressbookid` = ? ORDER BY `synctoken`";
-			if ($limit>0) {
-				$query .= " `LIMIT` " . (int)$limit;
+			if ($limit > 0) {
+				$query .= " `LIMIT` ".(int) $limit;
 			}
 
 			// Fetching all changes
@@ -799,15 +799,15 @@ 
 
 			// This loop ensures that any duplicates are overwritten, only the
 			// last change on a node is relevant.
-			while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+			while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
 
 				$changes[$row['uri']] = $row['operation'];
 
 			}
 
-			foreach($changes as $uri => $operation) {
+			foreach ($changes as $uri => $operation) {
 
-				switch($operation) {
+				switch ($operation) {
 					case 1:
 						$result['added'][] = $uri;
 						break;
@@ -893,7 +893,7 @@ 
 
 		// No need for like when the pattern is empty
 		if ('' !== $pattern) {
-			$query2->andWhere($query2->expr()->ilike('cp.value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
+			$query2->andWhere($query2->expr()->ilike('cp.value', $query->createNamedParameter('%'.$this->db->escapeLikeParameter($pattern).'%')));
 		}
 
 		$query->select('c.carddata', 'c.uri')->from($this->dbCardsTable, 'c')
@@ -946,7 +946,7 @@ 
 		$result->closeCursor();
 
 		if (!isset($uri['uri'])) {
-			throw new \InvalidArgumentException('Card does not exists: ' . $id);
+			throw new \InvalidArgumentException('Card does not exists: '.$id);
 		}
 
 		return $uri['uri'];
@@ -1018,11 +1018,11 @@ 
 			);
 
 		foreach ($vCard->children() as $property) {
-			if(!in_array($property->name, self::$indexProperties)) {
+			if (!in_array($property->name, self::$indexProperties)) {
 				continue;
 			}
 			$preferred = 0;
-			foreach($property->parameters as $parameter) {
+			foreach ($property->parameters as $parameter) {
 				if ($parameter->name === 'TYPE' && strtoupper($parameter->getValue()) === 'PREF') {
 					$preferred = 1;
 					break;
@@ -1077,10 +1077,10 @@ 
 		$result->closeCursor();
 
 		if (!isset($cardIds['id'])) {
-			throw new \InvalidArgumentException('Card does not exists: ' . $uri);
+			throw new \InvalidArgumentException('Card does not exists: '.$uri);
 		}
 
-		return (int)$cardIds['id'];
+		return (int) $cardIds['id'];
 	}
 
 	/**
@@ -1105,8 +1105,8 @@ 
 	}
 
 	private function addOwnerPrincipal(&$addressbookInfo) {
-		$ownerPrincipalKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_OWNCLOUD . '}owner-principal';
-		$displaynameKey = '{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}owner-displayname';
+		$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 {

Indentation +1072 added lines, -1072 removed lines

@@ -49,1076 +49,1076 @@
 
 class CardDavBackend implements BackendInterface, SyncSupport {
 
-	const PERSONAL_ADDRESSBOOK_URI = 'contacts';
-	const PERSONAL_ADDRESSBOOK_NAME = 'Contacts';
-
-	/** @var Principal */
-	private $principalBackend;
-
-	/** @var string */
-	private $dbCardsTable = 'cards';
-
-	/** @var string */
-	private $dbCardsPropertiesTable = 'cards_properties';
-
-	/** @var IDBConnection */
-	private $db;
-
-	/** @var Backend */
-	private $sharingBackend;
-
-	/** @var array properties to index */
-	public static $indexProperties = array(
-			'BDAY', 'UID', 'N', 'FN', 'TITLE', 'ROLE', 'NOTE', 'NICKNAME',
-			'ORG', 'CATEGORIES', 'EMAIL', 'TEL', 'IMPP', 'ADR', 'URL', 'GEO', 'CLOUD');
-
-	/**
-	 * @var string[] Map of uid => display name
-	 */
-	protected $userDisplayNames;
-
-	/** @var IUserManager */
-	private $userManager;
-
-	/** @var EventDispatcherInterface */
-	private $dispatcher;
-
-	/**
-	 * CardDavBackend constructor.
-	 *
-	 * @param IDBConnection $db
-	 * @param Principal $principalBackend
-	 * @param IUserManager $userManager
-	 * @param IGroupManager $groupManager
-	 * @param EventDispatcherInterface $dispatcher
-	 */
-	public function __construct(IDBConnection $db,
-								Principal $principalBackend,
-								IUserManager $userManager,
-								IGroupManager $groupManager,
-								EventDispatcherInterface $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->createFunction('COUNT(*)'))
-			->from('addressbooks')
-			->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
-
-		return (int)$query->execute()->fetchColumn();
-	}
-
-	/**
-	 * 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 $principalUri
-	 * @return array
-	 */
-	function getAddressBooksForUser($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' => $row['synctoken']?$row['synctoken']:'0',
-			];
-
-			$this->addOwnerPrincipal($addressBooks[$row['id']]);
-		}
-		$result->closeCursor();
-
-		// query for shared calendars
-		$principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
-		$principals = array_map(function($principal) {
-			return urldecode($principal);
-		}, $principals);
-		$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;
-				}
-			}
-
-			list(, $name) = \Sabre\Uri\split($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' => $row['synctoken']?$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' => $row['synctoken']?$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 $addressBookId
-	 */
-	public function getAddressBookById($addressBookId) {
-		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
-			->from('addressbooks')
-			->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId)))
-			->execute();
-
-		$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' => $row['synctoken']?$row['synctoken']:'0',
-		];
-
-		$this->addOwnerPrincipal($addressBook);
-
-		return $addressBook;
-	}
-
-	/**
-	 * @param $addressBookUri
-	 * @return array|null
-	 */
-	public function getAddressBooksByUri($principal, $addressBookUri) {
-		$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)
-			->execute();
-
-		$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' => $row['synctoken']?$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 $propPatch
-	 * @return void
-	 */
-	function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
-		$supportedProperties = [
-			'{DAV:}displayname',
-			'{' . Plugin::NS_CARDDAV . '}addressbook-description',
-		];
-
-		/**
-		 * @suppress SqlInjectionChecker
-		 */
-		$propPatch->handle($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)))
-			->execute();
-
-			$this->addChange($addressBookId, "", 2);
-
-			return true;
-
-		});
-	}
-
-	/**
-	 * Creates a new address book
-	 *
-	 * @param string $principalUri
-	 * @param string $url Just the 'basename' of the url.
-	 * @param array $properties
-	 * @return int
-	 * @throws BadRequest
-	 */
-	function createAddressBook($principalUri, $url, array $properties) {
-		$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;
-		}
-
-		$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();
-
-		return $query->getLastInsertId();
-	}
-
-	/**
-	 * Deletes an entire addressbook and all its contents
-	 *
-	 * @param mixed $addressBookId
-	 * @return void
-	 */
-	function deleteAddressBook($addressBookId) {
-		$query = $this->db->getQueryBuilder();
-		$query->delete('cards')
-			->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
-			->setParameter('addressbookid', $addressBookId)
-			->execute();
-
-		$query->delete('addressbookchanges')
-			->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
-			->setParameter('addressbookid', $addressBookId)
-			->execute();
-
-		$query->delete('addressbooks')
-			->where($query->expr()->eq('id', $query->createParameter('id')))
-			->setParameter('id', $addressBookId)
-			->execute();
-
-		$this->sharingBackend->deleteAllShares($addressBookId);
-
-		$query->delete($this->dbCardsPropertiesTable)
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->execute();
-
-	}
-
-	/**
-	 * 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 ommit carddata.
-	 * This may speed up certain requests, especially with large cards.
-	 *
-	 * @param mixed $addressBookId
-	 * @return array
-	 */
-	function getCards($addressBookId) {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
-			->from('cards')
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
-
-		$cards = [];
-
-		$result = $query->execute();
-		while($row = $result->fetch()) {
-			$row['etag'] = '"' . $row['etag'] . '"';
-			$row['carddata'] = $this->readBlob($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 $cardUri
-	 * @return array
-	 */
-	function getCard($addressBookId, $cardUri) {
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
-			->from('cards')
-			->where($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'] . '"';
-		$row['carddata'] = $this->readBlob($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 string[] $uris
-	 * @return array
-	 */
-	function getMultipleCards($addressBookId, array $uris) {
-		if (empty($uris)) {
-			return [];
-		}
-
-		$chunks = array_chunk($uris, 100);
-		$cards = [];
-
-		$query = $this->db->getQueryBuilder();
-		$query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
-			->from('cards')
-			->where($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'] . '"';
-				$row['carddata'] = $this->readBlob($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 $cardData
-	 * @return string
-	 */
-	function createCard($addressBookId, $cardUri, $cardData) {
-		$etag = md5($cardData);
-
-		$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),
-			])
-			->execute();
-
-		$this->addChange($addressBookId, $cardUri, 1);
-		$this->updateProperties($addressBookId, $cardUri, $cardData);
-
-		$this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::createCard',
-			new GenericEvent(null, [
-				'addressBookId' => $addressBookId,
-				'cardUri' => $cardUri,
-				'cardData' => $cardData]));
-
-		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 $cardData
-	 * @return string
-	 */
-	function updateCard($addressBookId, $cardUri, $cardData) {
-
-		$etag = md5($cardData);
-		$query = $this->db->getQueryBuilder();
-		$query->update('cards')
-			->set('carddata', $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB))
-			->set('lastmodified', $query->createNamedParameter(time()))
-			->set('size', $query->createNamedParameter(strlen($cardData)))
-			->set('etag', $query->createNamedParameter($etag))
-			->where($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
-			->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->execute();
-
-		$this->addChange($addressBookId, $cardUri, 2);
-		$this->updateProperties($addressBookId, $cardUri, $cardData);
-
-		$this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::updateCard',
-			new GenericEvent(null, [
-				'addressBookId' => $addressBookId,
-				'cardUri' => $cardUri,
-				'cardData' => $cardData]));
-
-		return '"' . $etag . '"';
-	}
-
-	/**
-	 * Deletes a card
-	 *
-	 * @param mixed $addressBookId
-	 * @param string $cardUri
-	 * @return bool
-	 */
-	function deleteCard($addressBookId, $cardUri) {
-		try {
-			$cardId = $this->getCardId($addressBookId, $cardUri);
-		} catch (\InvalidArgumentException $e) {
-			$cardId = null;
-		}
-		$query = $this->db->getQueryBuilder();
-		$ret = $query->delete('cards')
-			->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
-			->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
-			->execute();
-
-		$this->addChange($addressBookId, $cardUri, 3);
-
-		$this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::deleteCard',
-			new GenericEvent(null, [
-				'addressBookId' => $addressBookId,
-				'cardUri' => $cardUri]));
-
-		if ($ret === 1) {
-			if ($cardId !== null) {
-				$this->purgeProperties($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 $limit
-	 * @return array
-	 */
-	function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
-		// Current synctoken
-		$stmt = $this->db->prepare('SELECT `synctoken` FROM `*PREFIX*addressbooks` WHERE `id` = ?');
-		$stmt->execute([ $addressBookId ]);
-		$currentToken = $stmt->fetchColumn(0);
-
-		if (is_null($currentToken)) return null;
-
-		$result = [
-			'syncToken' => $currentToken,
-			'added'     => [],
-			'modified'  => [],
-			'deleted'   => [],
-		];
-
-		if ($syncToken) {
-
-			$query = "SELECT `uri`, `operation` FROM `*PREFIX*addressbookchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `addressbookid` = ? ORDER BY `synctoken`";
-			if ($limit>0) {
-				$query .= " `LIMIT` " . (int)$limit;
-			}
-
-			// Fetching all changes
-			$stmt = $this->db->prepare($query);
-			$stmt->execute([$syncToken, $currentToken, $addressBookId]);
-
-			$changes = [];
-
-			// This loop ensures that any duplicates are overwritten, only the
-			// last change on a node is relevant.
-			while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
-				$changes[$row['uri']] = $row['operation'];
-
-			}
-
-			foreach($changes as $uri => $operation) {
-
-				switch($operation) {
-					case 1:
-						$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.
-			$query = "SELECT `uri` FROM `*PREFIX*cards` WHERE `addressbookid` = ?";
-			$stmt = $this->db->prepare($query);
-			$stmt->execute([$addressBookId]);
-
-			$result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
-		}
-		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([
-			$addressBookId
-		]);
-	}
-
-	private function readBlob($cardData) {
-		if (is_resource($cardData)) {
-			return stream_get_contents($cardData);
-		}
-
-		return $cardData;
-	}
-
-	/**
-	 * @param IShareable $shareable
-	 * @param string[] $add
-	 * @param string[] $remove
-	 */
-	public function updateShares(IShareable $shareable, $add, $remove) {
-		$this->sharingBackend->updateShares($shareable, $add, $remove);
-	}
-
-	/**
-	 * search contact
-	 *
-	 * @param int $addressBookId
-	 * @param string $pattern which should match within the $searchProperties
-	 * @param array $searchProperties defines the properties within the query pattern should match
-	 * @return array an array of contacts which are arrays of key-value-pairs
-	 */
-	public function search($addressBookId, $pattern, $searchProperties) {
-		$query = $this->db->getQueryBuilder();
-		$query2 = $this->db->getQueryBuilder();
-
-		$query2->selectDistinct('cp.cardid')->from($this->dbCardsPropertiesTable, 'cp');
-		$query2->andWhere($query2->expr()->eq('cp.addressbookid', $query->createNamedParameter($addressBookId)));
-		$or = $query2->expr()->orX();
-		foreach ($searchProperties as $property) {
-			$or->add($query2->expr()->eq('cp.name', $query->createNamedParameter($property)));
-		}
-		$query2->andWhere($or);
-
-		// No need for like when the pattern is empty
-		if ('' !== $pattern) {
-			$query2->andWhere($query2->expr()->ilike('cp.value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
-		}
-
-		$query->select('c.carddata', 'c.uri')->from($this->dbCardsTable, 'c')
-			->where($query->expr()->in('c.id', $query->createFunction($query2->getSQL())));
-
-		$result = $query->execute();
-		$cards = $result->fetchAll();
-
-		$result->closeCursor();
-
-		return array_map(function($array) {
-			$array['carddata'] = $this->readBlob($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)) {
-			$result = $contact;
-		}
-
-		return $result;
-	}
-
-	/**
-	 * Returns the list of people whom this address book is shared with.
-	 *
-	 * Every element in this array should have the following properties:
-	 *   * href - Often a mailto: address
-	 *   * commonName - Optional, for example a first + last name
-	 *   * status - See the Sabre\CalDAV\SharingPlugin::STATUS_ constants.
-	 *   * readOnly - boolean
-	 *   * summary - Optional, a description for the share
-	 *
-	 * @return array
-	 */
-	public function getShares($addressBookId) {
-		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' => $query->createParameter('preferred')
-				]
-			);
-
-		foreach ($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);
-			$query->setParameter('value', substr($property->getValue(), 0, 254));
-			$query->setParameter('preferred', $preferred);
-			$query->execute();
-		}
-	}
-
-	/**
-	 * 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
-	 *
-	 * @param int $addressBookId
-	 * @param string $uri
-	 * @return int
-	 */
-	protected function getCardId($addressBookId, $uri) {
-		$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 $addressBookId
-	 * @param $acl
-	 * @return array
-	 */
-	public function applyShareAcl($addressBookId, $acl) {
-		return $this->sharingBackend->applyShareAcl($addressBookId, $acl);
-	}
-
-	private function convertPrincipal($principalUri, $toV2) {
-		if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
-			list(, $name) = \Sabre\Uri\split($principalUri);
-			if ($toV2 === true) {
-				return "principals/users/$name";
-			}
-			return "principals/$name";
-		}
-		return $principalUri;
-	}
-
-	private function addOwnerPrincipal(&$addressbookInfo) {
-		$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'];
-		}
-	}
+    const PERSONAL_ADDRESSBOOK_URI = 'contacts';
+    const PERSONAL_ADDRESSBOOK_NAME = 'Contacts';
+
+    /** @var Principal */
+    private $principalBackend;
+
+    /** @var string */
+    private $dbCardsTable = 'cards';
+
+    /** @var string */
+    private $dbCardsPropertiesTable = 'cards_properties';
+
+    /** @var IDBConnection */
+    private $db;
+
+    /** @var Backend */
+    private $sharingBackend;
+
+    /** @var array properties to index */
+    public static $indexProperties = array(
+            'BDAY', 'UID', 'N', 'FN', 'TITLE', 'ROLE', 'NOTE', 'NICKNAME',
+            'ORG', 'CATEGORIES', 'EMAIL', 'TEL', 'IMPP', 'ADR', 'URL', 'GEO', 'CLOUD');
+
+    /**
+     * @var string[] Map of uid => display name
+     */
+    protected $userDisplayNames;
+
+    /** @var IUserManager */
+    private $userManager;
+
+    /** @var EventDispatcherInterface */
+    private $dispatcher;
+
+    /**
+     * CardDavBackend constructor.
+     *
+     * @param IDBConnection $db
+     * @param Principal $principalBackend
+     * @param IUserManager $userManager
+     * @param IGroupManager $groupManager
+     * @param EventDispatcherInterface $dispatcher
+     */
+    public function __construct(IDBConnection $db,
+                                Principal $principalBackend,
+                                IUserManager $userManager,
+                                IGroupManager $groupManager,
+                                EventDispatcherInterface $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->createFunction('COUNT(*)'))
+            ->from('addressbooks')
+            ->where($query->expr()->eq('principaluri', $query->createNamedParameter($principalUri)));
+
+        return (int)$query->execute()->fetchColumn();
+    }
+
+    /**
+     * 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 $principalUri
+     * @return array
+     */
+    function getAddressBooksForUser($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' => $row['synctoken']?$row['synctoken']:'0',
+            ];
+
+            $this->addOwnerPrincipal($addressBooks[$row['id']]);
+        }
+        $result->closeCursor();
+
+        // query for shared calendars
+        $principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
+        $principals = array_map(function($principal) {
+            return urldecode($principal);
+        }, $principals);
+        $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;
+                }
+            }
+
+            list(, $name) = \Sabre\Uri\split($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' => $row['synctoken']?$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' => $row['synctoken']?$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 $addressBookId
+     */
+    public function getAddressBookById($addressBookId) {
+        $query = $this->db->getQueryBuilder();
+        $result = $query->select(['id', 'uri', 'displayname', 'principaluri', 'description', 'synctoken'])
+            ->from('addressbooks')
+            ->where($query->expr()->eq('id', $query->createNamedParameter($addressBookId)))
+            ->execute();
+
+        $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' => $row['synctoken']?$row['synctoken']:'0',
+        ];
+
+        $this->addOwnerPrincipal($addressBook);
+
+        return $addressBook;
+    }
+
+    /**
+     * @param $addressBookUri
+     * @return array|null
+     */
+    public function getAddressBooksByUri($principal, $addressBookUri) {
+        $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)
+            ->execute();
+
+        $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' => $row['synctoken']?$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 $propPatch
+     * @return void
+     */
+    function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
+        $supportedProperties = [
+            '{DAV:}displayname',
+            '{' . Plugin::NS_CARDDAV . '}addressbook-description',
+        ];
+
+        /**
+         * @suppress SqlInjectionChecker
+         */
+        $propPatch->handle($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)))
+            ->execute();
+
+            $this->addChange($addressBookId, "", 2);
+
+            return true;
+
+        });
+    }
+
+    /**
+     * Creates a new address book
+     *
+     * @param string $principalUri
+     * @param string $url Just the 'basename' of the url.
+     * @param array $properties
+     * @return int
+     * @throws BadRequest
+     */
+    function createAddressBook($principalUri, $url, array $properties) {
+        $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;
+        }
+
+        $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();
+
+        return $query->getLastInsertId();
+    }
+
+    /**
+     * Deletes an entire addressbook and all its contents
+     *
+     * @param mixed $addressBookId
+     * @return void
+     */
+    function deleteAddressBook($addressBookId) {
+        $query = $this->db->getQueryBuilder();
+        $query->delete('cards')
+            ->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
+            ->setParameter('addressbookid', $addressBookId)
+            ->execute();
+
+        $query->delete('addressbookchanges')
+            ->where($query->expr()->eq('addressbookid', $query->createParameter('addressbookid')))
+            ->setParameter('addressbookid', $addressBookId)
+            ->execute();
+
+        $query->delete('addressbooks')
+            ->where($query->expr()->eq('id', $query->createParameter('id')))
+            ->setParameter('id', $addressBookId)
+            ->execute();
+
+        $this->sharingBackend->deleteAllShares($addressBookId);
+
+        $query->delete($this->dbCardsPropertiesTable)
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->execute();
+
+    }
+
+    /**
+     * 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 ommit carddata.
+     * This may speed up certain requests, especially with large cards.
+     *
+     * @param mixed $addressBookId
+     * @return array
+     */
+    function getCards($addressBookId) {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
+            ->from('cards')
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)));
+
+        $cards = [];
+
+        $result = $query->execute();
+        while($row = $result->fetch()) {
+            $row['etag'] = '"' . $row['etag'] . '"';
+            $row['carddata'] = $this->readBlob($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 $cardUri
+     * @return array
+     */
+    function getCard($addressBookId, $cardUri) {
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
+            ->from('cards')
+            ->where($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'] . '"';
+        $row['carddata'] = $this->readBlob($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 string[] $uris
+     * @return array
+     */
+    function getMultipleCards($addressBookId, array $uris) {
+        if (empty($uris)) {
+            return [];
+        }
+
+        $chunks = array_chunk($uris, 100);
+        $cards = [];
+
+        $query = $this->db->getQueryBuilder();
+        $query->select(['id', 'uri', 'lastmodified', 'etag', 'size', 'carddata'])
+            ->from('cards')
+            ->where($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'] . '"';
+                $row['carddata'] = $this->readBlob($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 $cardData
+     * @return string
+     */
+    function createCard($addressBookId, $cardUri, $cardData) {
+        $etag = md5($cardData);
+
+        $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),
+            ])
+            ->execute();
+
+        $this->addChange($addressBookId, $cardUri, 1);
+        $this->updateProperties($addressBookId, $cardUri, $cardData);
+
+        $this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::createCard',
+            new GenericEvent(null, [
+                'addressBookId' => $addressBookId,
+                'cardUri' => $cardUri,
+                'cardData' => $cardData]));
+
+        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 $cardData
+     * @return string
+     */
+    function updateCard($addressBookId, $cardUri, $cardData) {
+
+        $etag = md5($cardData);
+        $query = $this->db->getQueryBuilder();
+        $query->update('cards')
+            ->set('carddata', $query->createNamedParameter($cardData, IQueryBuilder::PARAM_LOB))
+            ->set('lastmodified', $query->createNamedParameter(time()))
+            ->set('size', $query->createNamedParameter(strlen($cardData)))
+            ->set('etag', $query->createNamedParameter($etag))
+            ->where($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
+            ->andWhere($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->execute();
+
+        $this->addChange($addressBookId, $cardUri, 2);
+        $this->updateProperties($addressBookId, $cardUri, $cardData);
+
+        $this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::updateCard',
+            new GenericEvent(null, [
+                'addressBookId' => $addressBookId,
+                'cardUri' => $cardUri,
+                'cardData' => $cardData]));
+
+        return '"' . $etag . '"';
+    }
+
+    /**
+     * Deletes a card
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @return bool
+     */
+    function deleteCard($addressBookId, $cardUri) {
+        try {
+            $cardId = $this->getCardId($addressBookId, $cardUri);
+        } catch (\InvalidArgumentException $e) {
+            $cardId = null;
+        }
+        $query = $this->db->getQueryBuilder();
+        $ret = $query->delete('cards')
+            ->where($query->expr()->eq('addressbookid', $query->createNamedParameter($addressBookId)))
+            ->andWhere($query->expr()->eq('uri', $query->createNamedParameter($cardUri)))
+            ->execute();
+
+        $this->addChange($addressBookId, $cardUri, 3);
+
+        $this->dispatcher->dispatch('\OCA\DAV\CardDAV\CardDavBackend::deleteCard',
+            new GenericEvent(null, [
+                'addressBookId' => $addressBookId,
+                'cardUri' => $cardUri]));
+
+        if ($ret === 1) {
+            if ($cardId !== null) {
+                $this->purgeProperties($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 $limit
+     * @return array
+     */
+    function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
+        // Current synctoken
+        $stmt = $this->db->prepare('SELECT `synctoken` FROM `*PREFIX*addressbooks` WHERE `id` = ?');
+        $stmt->execute([ $addressBookId ]);
+        $currentToken = $stmt->fetchColumn(0);
+
+        if (is_null($currentToken)) return null;
+
+        $result = [
+            'syncToken' => $currentToken,
+            'added'     => [],
+            'modified'  => [],
+            'deleted'   => [],
+        ];
+
+        if ($syncToken) {
+
+            $query = "SELECT `uri`, `operation` FROM `*PREFIX*addressbookchanges` WHERE `synctoken` >= ? AND `synctoken` < ? AND `addressbookid` = ? ORDER BY `synctoken`";
+            if ($limit>0) {
+                $query .= " `LIMIT` " . (int)$limit;
+            }
+
+            // Fetching all changes
+            $stmt = $this->db->prepare($query);
+            $stmt->execute([$syncToken, $currentToken, $addressBookId]);
+
+            $changes = [];
+
+            // This loop ensures that any duplicates are overwritten, only the
+            // last change on a node is relevant.
+            while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+                $changes[$row['uri']] = $row['operation'];
+
+            }
+
+            foreach($changes as $uri => $operation) {
+
+                switch($operation) {
+                    case 1:
+                        $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.
+            $query = "SELECT `uri` FROM `*PREFIX*cards` WHERE `addressbookid` = ?";
+            $stmt = $this->db->prepare($query);
+            $stmt->execute([$addressBookId]);
+
+            $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+        }
+        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([
+            $addressBookId
+        ]);
+    }
+
+    private function readBlob($cardData) {
+        if (is_resource($cardData)) {
+            return stream_get_contents($cardData);
+        }
+
+        return $cardData;
+    }
+
+    /**
+     * @param IShareable $shareable
+     * @param string[] $add
+     * @param string[] $remove
+     */
+    public function updateShares(IShareable $shareable, $add, $remove) {
+        $this->sharingBackend->updateShares($shareable, $add, $remove);
+    }
+
+    /**
+     * search contact
+     *
+     * @param int $addressBookId
+     * @param string $pattern which should match within the $searchProperties
+     * @param array $searchProperties defines the properties within the query pattern should match
+     * @return array an array of contacts which are arrays of key-value-pairs
+     */
+    public function search($addressBookId, $pattern, $searchProperties) {
+        $query = $this->db->getQueryBuilder();
+        $query2 = $this->db->getQueryBuilder();
+
+        $query2->selectDistinct('cp.cardid')->from($this->dbCardsPropertiesTable, 'cp');
+        $query2->andWhere($query2->expr()->eq('cp.addressbookid', $query->createNamedParameter($addressBookId)));
+        $or = $query2->expr()->orX();
+        foreach ($searchProperties as $property) {
+            $or->add($query2->expr()->eq('cp.name', $query->createNamedParameter($property)));
+        }
+        $query2->andWhere($or);
+
+        // No need for like when the pattern is empty
+        if ('' !== $pattern) {
+            $query2->andWhere($query2->expr()->ilike('cp.value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%')));
+        }
+
+        $query->select('c.carddata', 'c.uri')->from($this->dbCardsTable, 'c')
+            ->where($query->expr()->in('c.id', $query->createFunction($query2->getSQL())));
+
+        $result = $query->execute();
+        $cards = $result->fetchAll();
+
+        $result->closeCursor();
+
+        return array_map(function($array) {
+            $array['carddata'] = $this->readBlob($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)) {
+            $result = $contact;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Returns the list of people whom this address book is shared with.
+     *
+     * Every element in this array should have the following properties:
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first + last name
+     *   * status - See the Sabre\CalDAV\SharingPlugin::STATUS_ constants.
+     *   * readOnly - boolean
+     *   * summary - Optional, a description for the share
+     *
+     * @return array
+     */
+    public function getShares($addressBookId) {
+        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' => $query->createParameter('preferred')
+                ]
+            );
+
+        foreach ($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);
+            $query->setParameter('value', substr($property->getValue(), 0, 254));
+            $query->setParameter('preferred', $preferred);
+            $query->execute();
+        }
+    }
+
+    /**
+     * 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
+     *
+     * @param int $addressBookId
+     * @param string $uri
+     * @return int
+     */
+    protected function getCardId($addressBookId, $uri) {
+        $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 $addressBookId
+     * @param $acl
+     * @return array
+     */
+    public function applyShareAcl($addressBookId, $acl) {
+        return $this->sharingBackend->applyShareAcl($addressBookId, $acl);
+    }
+
+    private function convertPrincipal($principalUri, $toV2) {
+        if ($this->principalBackend->getPrincipalPrefix() === 'principals') {
+            list(, $name) = \Sabre\Uri\split($principalUri);
+            if ($toV2 === true) {
+                return "principals/users/$name";
+            }
+            return "principals/$name";
+        }
+        return $principalUri;
+    }
+
+    private function addOwnerPrincipal(&$addressbookInfo) {
+        $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'];
+        }
+    }
 }

apps/dav/lib/CardDAV/ContactsManager.php

Indentation +43 added lines, -43 removed lines

@@ -29,52 +29,52 @@
 use OCP\IURLGenerator;
 
 class ContactsManager {
-	/** @var CardDavBackend  */
-	private $backend;
+    /** @var CardDavBackend  */
+    private $backend;
 
-	/** @var IL10N  */
-	private $l10n;
+    /** @var IL10N  */
+    private $l10n;
 
-	/**
-	 * ContactsManager constructor.
-	 *
-	 * @param CardDavBackend $backend
-	 * @param IL10N $l10n
-	 */
-	public function __construct(CardDavBackend $backend, IL10N $l10n) {
-		$this->backend = $backend;
-		$this->l10n = $l10n;
-	}
+    /**
+     * ContactsManager constructor.
+     *
+     * @param CardDavBackend $backend
+     * @param IL10N $l10n
+     */
+    public function __construct(CardDavBackend $backend, IL10N $l10n) {
+        $this->backend = $backend;
+        $this->l10n = $l10n;
+    }
 
-	/**
-	 * @param IManager $cm
-	 * @param string $userId
-	 * @param IURLGenerator $urlGenerator
-	 */
-	public function setupContactsProvider(IManager $cm, $userId, IURLGenerator $urlGenerator) {
-		$addressBooks = $this->backend->getAddressBooksForUser("principals/users/$userId");
-		$this->register($cm, $addressBooks, $urlGenerator);
-		$addressBooks = $this->backend->getAddressBooksForUser("principals/system/system");
-		$this->register($cm, $addressBooks, $urlGenerator);
-	}
+    /**
+     * @param IManager $cm
+     * @param string $userId
+     * @param IURLGenerator $urlGenerator
+     */
+    public function setupContactsProvider(IManager $cm, $userId, IURLGenerator $urlGenerator) {
+        $addressBooks = $this->backend->getAddressBooksForUser("principals/users/$userId");
+        $this->register($cm, $addressBooks, $urlGenerator);
+        $addressBooks = $this->backend->getAddressBooksForUser("principals/system/system");
+        $this->register($cm, $addressBooks, $urlGenerator);
+    }
 
-	/**
-	 * @param IManager $cm
-	 * @param $addressBooks
-	 * @param IURLGenerator $urlGenerator
-	 */
-	private function register(IManager $cm, $addressBooks, $urlGenerator) {
-		foreach ($addressBooks as $addressBookInfo) {
-			$addressBook = new \OCA\DAV\CardDAV\AddressBook($this->backend, $addressBookInfo, $this->l10n);
-			$cm->registerAddressBook(
-				new AddressBookImpl(
-					$addressBook,
-					$addressBookInfo,
-					$this->backend,
-					$urlGenerator
-				)
-			);
-		}
-	}
+    /**
+     * @param IManager $cm
+     * @param $addressBooks
+     * @param IURLGenerator $urlGenerator
+     */
+    private function register(IManager $cm, $addressBooks, $urlGenerator) {
+        foreach ($addressBooks as $addressBookInfo) {
+            $addressBook = new \OCA\DAV\CardDAV\AddressBook($this->backend, $addressBookInfo, $this->l10n);
+            $cm->registerAddressBook(
+                new AddressBookImpl(
+                    $addressBook,
+                    $addressBookInfo,
+                    $this->backend,
+                    $urlGenerator
+                )
+            );
+        }
+    }
 
 }