Support iMIP invitations from Mail

Signed-off-by: Anna Larch <anna@nextcloud.com>

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -2165,6 +2165,68 @@ public function getCalendarObjectByUID($principalUri, $uid) {
 		return null;
 	}
 
+	/**
+	 * Searches through all of a users calendars and calendar objects to find
+	 * an object with a specific UID.
+	 *
+	 * This method should return the path to this object, relative to the
+	 * calendar home, so this path usually only contains two parts:
+	 *
+	 * calendarpath/objectpath.ics
+	 *
+	 * If the uid is not found, return null.
+	 *
+	 * This method should only consider * objects that the principal owns, so
+	 * any calendars owned by other principals that also appear in this
+	 * collection should be ignored.
+	 *
+	 * @param string $principalUri
+	 * @param string $uid
+	 * @return string|null
+	 */
+	public function searchByUid(string $principalUri, string $uid): ?string {
+		$query = $this->db->getQueryBuilder();
+		$query->selectAlias('c.uri', 'calendaruri')->selectAlias('co.uri', 'objecturi')
+			->from('calendarobjects', 'co')
+			->leftJoin('co', 'calendars', 'c', $query->expr()->eq('co.calendarid', 'c.id'))
+			->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
+			->andWhere($query->expr()->eq('co.uid', $query->createNamedParameter($uid)))
+			->andWhere($query->expr()->isNull('co.deleted_at'));
+		$stmt = $query->executeQuery();
+		$row = $stmt->fetch();
+		$stmt->closeCursor();
+		if ($row) {
+			return $this->readBlob($row['calendardata']);
+		}
+
+		return null;
+	}
+
+	/**
+	 * Searches through all of a users calendars and calendar objects to find
+	 * an object with a specific UID and will return the complete object
+	 *
+	 * @param string $principalUri
+	 * @param string $uid
+	 * @return string|null
+	 */
+	public function searchPrincipalByUid(string $principalUri, string $uid): ?array {
+		$query = $this->db->getQueryBuilder();
+		$query->select('c.*', 'co.calendardata', 'co.calendarid', 'co.uid')
+			->from('calendarobjects', 'co')
+			->leftJoin('co', 'calendars', 'c', $query->expr()->eq('co.calendarid', 'c.id'))
+			->where($query->expr()->eq('c.principaluri', $query->createNamedParameter($principalUri)))
+			->andWhere($query->expr()->eq('co.uid', $query->createNamedParameter($uid)))
+			->andWhere($query->expr()->isNull('co.deleted_at'));
+		$stmt = $query->executeQuery();
+		$row = $stmt->fetch();
+		$stmt->closeCursor();
+		if ($row) {
+			return $row;
+		}
+		return null;
+	}
+
 	public function getCalendarObjectById(string $principalUri, int $id): ?array {
 		$query = $this->db->getQueryBuilder();
 		$query->select(['co.id', 'co.uri', 'co.lastmodified', 'co.etag', 'co.calendarid', 'co.size', 'co.calendardata', 'co.componenttype', 'co.classification', 'co.deleted_at'])

apps/dav/lib/CalDAV/CalendarHome.php

@@ -206,8 +206,11 @@ public function calendarSearch(array $filters, $limit = null, $offset = null) {
 		return $this->caldavBackend->calendarSearch($principalUri, $filters, $limit, $offset);
 	}
 
-
 	public function enableCachedSubscriptionsForThisRequest() {
 		$this->returnCachedSubscriptions = true;
 	}
+
+	public function searchPrincipalByUid(string $principalUri, string $uid): ?array {
+		return $this->caldavBackend->searchPrincipalByUid($principalUri, $uid);
+	}
 }

apps/dav/lib/CalDAV/CalendarImpl.php

@@ -29,10 +29,19 @@
 
 use OCA\DAV\CalDAV\Auth\CustomPrincipalPlugin;
 use OCA\DAV\CalDAV\InvitationResponse\InvitationResponseServer;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Calendar\Exceptions\CalendarException;
 use OCP\Calendar\ICreateFromString;
 use OCP\Constants;
+use OCP\Security\ISecureRandom;
+use Psr\Log\LoggerInterface;
 use Sabre\DAV\Exception\Conflict;
+use Sabre\VObject\Component\VCalendar;
+use Sabre\VObject\Component\VEvent;
+use Sabre\VObject\Document;
+use Sabre\VObject\ITip\Message;
+use Sabre\VObject\Property\VCard\DateTime;
+use Sabre\VObject\Reader;
 use function Sabre\Uri\split as uriSplit;
 
 class CalendarImpl implements ICreateFromString {
@@ -46,13 +55,6 @@ class CalendarImpl implements ICreateFromString {
 	/** @var array */
 	private $calendarInfo;
 
-	/**
-	 * CalendarImpl constructor.
-	 *
-	 * @param Calendar $calendar
-	 * @param array $calendarInfo
-	 * @param CalDavBackend $backend
-	 */
 	public function __construct(Calendar $calendar,
 								array $calendarInfo,
 								CalDavBackend $backend) {
@@ -177,4 +179,23 @@ public function createFromString(string $name, string $calendarData): void {
 			fclose($stream);
 		}
 	}
+
+	public function handleIMipMessage(Message $iTipMessage): void {
+		$server = new InvitationResponseServer(false);
+
+		/** @var CustomPrincipalPlugin $plugin */
+		$plugin = $server->server->getPlugin('auth');
+		// we're working around the previous implementation
+		// that only allowed the public system principal to be used
+		// so set the custom principal here
+		$plugin->setCurrentPrincipal($this->calendar->getPrincipalURI());
+
+		if (empty($this->calendarInfo['uri'])) {
+			throw new CalendarException('Could not write to calendar as URI parameter is missing');
+		}
+		// Force calendar change URI
+		/** @var Schedule\Plugin $schedulingPlugin */
+		$schedulingPlugin = $server->server->getPlugin('caldav-schedule');
+		$schedulingPlugin->scheduleLocalDelivery($iTipMessage);
+	}
 }

apps/dav/lib/CalDAV/CalendarProvider.php

@@ -26,6 +26,7 @@
 namespace OCA\DAV\CalDAV;
 
 use OCP\Calendar\ICalendarProvider;
+use OCP\Calendar\ICreateFromString;
 use OCP\IConfig;
 use OCP\IL10N;
 use Psr\Log\LoggerInterface;
@@ -51,6 +52,9 @@ public function __construct(CalDavBackend $calDavBackend, IL10N $l10n, IConfig $
 		$this->logger = $logger;
 	}
 
+	/**
+	 * @return ICreateFromString[]
+	 */
 	public function getCalendars(string $principalUri, array $calendarUris = []): array {
 		$calendarInfos = [];
 		if (empty($calendarUris)) {
@@ -69,9 +73,13 @@ public function getCalendars(string $principalUri, array $calendarUris = []): ar
 			$iCalendars[] = new CalendarImpl(
 				$calendar,
 				$calendarInfo,
-				$this->calDavBackend,
+				$this->calDavBackend
 			);
 		}
 		return $iCalendars;
 	}
+
+	public function provideCalendarHome(string $principalUri): CalendarHome {
+		return new CalendarHome($this->calDavBackend, $principalUri, $this->logger);
+	}
 }

apps/dav/lib/Controller/InvitationResponseController.php

@@ -29,6 +29,8 @@
 
 use OCA\DAV\CalDAV\InvitationResponse\InvitationResponseServer;
 use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\JSONResponse;
 use OCP\AppFramework\Http\TemplateResponse;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IDBConnection;