migrate therinaldos.com data

wedding-pics/apps/dav/lib/AppInfo/Application.php

@@ -0,0 +1,314 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Bjoern Schiessle <bjoern@schiessle.org>
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Thomas Citharel <nextcloud@tcit.fr>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ * @author Tobia De Koninck <tobia@ledfan.be>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\AppInfo;
+
+use OCA\DAV\CalDAV\Activity\Backend;
+use OCA\DAV\CalDAV\AppCalendar\AppCalendarPlugin;
+use OCA\DAV\CalDAV\CalendarManager;
+use OCA\DAV\CalDAV\CalendarProvider;
+use OCA\DAV\CalDAV\Reminder\NotificationProvider\AudioProvider;
+use OCA\DAV\CalDAV\Reminder\NotificationProvider\EmailProvider;
+use OCA\DAV\CalDAV\Reminder\NotificationProvider\PushProvider;
+use OCA\DAV\CalDAV\Reminder\NotificationProviderManager;
+use OCA\DAV\CalDAV\Reminder\Notifier;
+
+use OCA\DAV\Capabilities;
+use OCA\DAV\CardDAV\ContactsManager;
+use OCA\DAV\CardDAV\PhotoCache;
+use OCA\DAV\CardDAV\SyncService;
+use OCA\DAV\Events\AddressBookCreatedEvent;
+use OCA\DAV\Events\AddressBookDeletedEvent;
+use OCA\DAV\Events\AddressBookShareUpdatedEvent;
+use OCA\DAV\Events\AddressBookUpdatedEvent;
+use OCA\DAV\Events\CalendarCreatedEvent;
+use OCA\DAV\Events\CalendarDeletedEvent;
+use OCA\DAV\Events\CalendarMovedToTrashEvent;
+use OCA\DAV\Events\CalendarObjectCreatedEvent;
+use OCA\DAV\Events\CalendarObjectDeletedEvent;
+use OCA\DAV\Events\CalendarObjectMovedEvent;
+use OCA\DAV\Events\CalendarObjectMovedToTrashEvent;
+use OCA\DAV\Events\CalendarObjectRestoredEvent;
+use OCA\DAV\Events\CalendarObjectUpdatedEvent;
+use OCA\DAV\Events\CalendarPublishedEvent;
+use OCA\DAV\Events\CalendarRestoredEvent;
+use OCA\DAV\Events\CalendarShareUpdatedEvent;
+use OCA\DAV\Events\CalendarUnpublishedEvent;
+use OCA\DAV\Events\CalendarUpdatedEvent;
+use OCA\DAV\Events\CardCreatedEvent;
+use OCA\DAV\Events\CardDeletedEvent;
+use OCA\DAV\Events\CardUpdatedEvent;
+use OCA\DAV\Events\SubscriptionCreatedEvent;
+use OCA\DAV\Events\SubscriptionDeletedEvent;
+use OCA\DAV\HookManager;
+use OCA\DAV\Listener\ActivityUpdaterListener;
+use OCA\DAV\Listener\AddressbookListener;
+use OCA\DAV\Listener\BirthdayListener;
+use OCA\DAV\Listener\CalendarContactInteractionListener;
+use OCA\DAV\Listener\CalendarDeletionDefaultUpdaterListener;
+use OCA\DAV\Listener\CalendarObjectReminderUpdaterListener;
+use OCA\DAV\Listener\CalendarPublicationListener;
+use OCA\DAV\Listener\CalendarShareUpdateListener;
+use OCA\DAV\Listener\CardListener;
+use OCA\DAV\Listener\ClearPhotoCacheListener;
+use OCA\DAV\Listener\OutOfOfficeListener;
+use OCA\DAV\Listener\SubscriptionListener;
+use OCA\DAV\Listener\TrustedServerRemovedListener;
+use OCA\DAV\Listener\UserPreferenceListener;
+use OCA\DAV\Search\ContactsSearchProvider;
+use OCA\DAV\Search\EventsSearchProvider;
+use OCA\DAV\Search\TasksSearchProvider;
+use OCA\DAV\SetupChecks\NeedsSystemAddressBookSync;
+use OCA\DAV\UserMigration\CalendarMigrator;
+use OCA\DAV\UserMigration\ContactsMigrator;
+use OCP\Accounts\UserUpdatedEvent;
+use OCP\AppFramework\App;
+use OCP\AppFramework\Bootstrap\IBootContext;
+use OCP\AppFramework\Bootstrap\IBootstrap;
+use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\AppFramework\IAppContainer;
+use OCP\Calendar\IManager as ICalendarManager;
+use OCP\Config\BeforePreferenceDeletedEvent;
+use OCP\Config\BeforePreferenceSetEvent;
+use OCP\Contacts\IManager as IContactsManager;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Federation\Events\TrustedServerRemovedEvent;
+use OCP\Files\AppData\IAppDataFactory;
+use OCP\IUser;
+use OCP\User\Events\OutOfOfficeChangedEvent;
+use OCP\User\Events\OutOfOfficeClearedEvent;
+use OCP\User\Events\OutOfOfficeScheduledEvent;
+use Psr\Container\ContainerInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
+use Throwable;
+use function is_null;
+
+class Application extends App implements IBootstrap {
+	public const APP_ID = 'dav';
+
+	public function __construct() {
+		parent::__construct(self::APP_ID);
+	}
+
+	public function register(IRegistrationContext $context): void {
+		$context->registerServiceAlias('CardDAVSyncService', SyncService::class);
+		$context->registerService(PhotoCache::class, function (ContainerInterface $c) {
+			return new PhotoCache(
+				$c->get(IAppDataFactory::class)->get('dav-photocache'),
+				$c->get(LoggerInterface::class)
+			);
+		});
+		$context->registerService(AppCalendarPlugin::class, function (ContainerInterface $c) {
+			return new AppCalendarPlugin(
+				$c->get(ICalendarManager::class),
+				$c->get(LoggerInterface::class)
+			);
+		});
+
+		/*
+		 * Register capabilities
+		 */
+		$context->registerCapability(Capabilities::class);
+
+		/*
+		 * Register Search Providers
+		 */
+		$context->registerSearchProvider(ContactsSearchProvider::class);
+		$context->registerSearchProvider(EventsSearchProvider::class);
+		$context->registerSearchProvider(TasksSearchProvider::class);
+
+		/**
+		 * Register event listeners
+		 */
+		$context->registerEventListener(CalendarCreatedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarDeletedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarDeletedEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarDeletedEvent::class, CalendarDeletionDefaultUpdaterListener::class);
+		$context->registerEventListener(CalendarMovedToTrashEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarMovedToTrashEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarUpdatedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarRestoredEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarRestoredEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectCreatedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectCreatedEvent::class, CalendarContactInteractionListener::class);
+		$context->registerEventListener(CalendarObjectCreatedEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectUpdatedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectUpdatedEvent::class, CalendarContactInteractionListener::class);
+		$context->registerEventListener(CalendarObjectUpdatedEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectDeletedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectDeletedEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectMovedEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectMovedEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectMovedToTrashEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectMovedToTrashEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectRestoredEvent::class, ActivityUpdaterListener::class);
+		$context->registerEventListener(CalendarObjectRestoredEvent::class, CalendarObjectReminderUpdaterListener::class);
+		$context->registerEventListener(CalendarShareUpdatedEvent::class, CalendarContactInteractionListener::class);
+		$context->registerEventListener(CalendarPublishedEvent::class, CalendarPublicationListener::class);
+		$context->registerEventListener(CalendarUnpublishedEvent::class, CalendarPublicationListener::class);
+		$context->registerEventListener(CalendarShareUpdatedEvent::class, CalendarShareUpdateListener::class);
+
+		$context->registerEventListener(SubscriptionCreatedEvent::class, SubscriptionListener::class);
+		$context->registerEventListener(SubscriptionDeletedEvent::class, SubscriptionListener::class);
+
+
+		$context->registerEventListener(AddressBookCreatedEvent::class, AddressbookListener::class);
+		$context->registerEventListener(AddressBookDeletedEvent::class, AddressbookListener::class);
+		$context->registerEventListener(AddressBookUpdatedEvent::class, AddressbookListener::class);
+		$context->registerEventListener(AddressBookShareUpdatedEvent::class, AddressbookListener::class);
+		$context->registerEventListener(CardCreatedEvent::class, CardListener::class);
+		$context->registerEventListener(CardDeletedEvent::class, CardListener::class);
+		$context->registerEventListener(CardUpdatedEvent::class, CardListener::class);
+		$context->registerEventListener(CardCreatedEvent::class, BirthdayListener::class);
+		$context->registerEventListener(CardDeletedEvent::class, BirthdayListener::class);
+		$context->registerEventListener(CardUpdatedEvent::class, BirthdayListener::class);
+		$context->registerEventListener(CardDeletedEvent::class, ClearPhotoCacheListener::class);
+		$context->registerEventListener(CardUpdatedEvent::class, ClearPhotoCacheListener::class);
+		$context->registerEventListener(TrustedServerRemovedEvent::class, TrustedServerRemovedListener::class);
+
+		$context->registerEventListener(BeforePreferenceDeletedEvent::class, UserPreferenceListener::class);
+		$context->registerEventListener(BeforePreferenceSetEvent::class, UserPreferenceListener::class);
+
+		$context->registerEventListener(OutOfOfficeChangedEvent::class, OutOfOfficeListener::class);
+		$context->registerEventListener(OutOfOfficeClearedEvent::class, OutOfOfficeListener::class);
+		$context->registerEventListener(OutOfOfficeScheduledEvent::class, OutOfOfficeListener::class);
+
+		$context->registerNotifierService(Notifier::class);
+
+		$context->registerCalendarProvider(CalendarProvider::class);
+
+		$context->registerUserMigrator(CalendarMigrator::class);
+		$context->registerUserMigrator(ContactsMigrator::class);
+
+		$context->registerSetupCheck(NeedsSystemAddressBookSync::class);
+	}
+
+	public function boot(IBootContext $context): void {
+		// Load all dav apps
+		\OC_App::loadApps(['dav']);
+
+		$context->injectFn([$this, 'registerHooks']);
+		$context->injectFn([$this, 'registerContactsManager']);
+		$context->injectFn([$this, 'registerCalendarManager']);
+		$context->injectFn([$this, 'registerCalendarReminders']);
+	}
+
+	public function registerHooks(HookManager $hm,
+		IEventDispatcher $dispatcher,
+		IAppContainer $container) {
+		$hm->setup();
+
+		// first time login event setup
+		$dispatcher->addListener(IUser::class . '::firstLogin', function ($event) use ($hm) {
+			if ($event instanceof GenericEvent) {
+				$hm->firstLogin($event->getSubject());
+			}
+		});
+
+		$dispatcher->addListener(UserUpdatedEvent::class, function (UserUpdatedEvent $event) use ($container) {
+			/** @var SyncService $syncService */
+			$syncService = \OCP\Server::get(SyncService::class);
+			$syncService->updateUser($event->getUser());
+		});
+
+
+		$dispatcher->addListener(CalendarShareUpdatedEvent::class, function (CalendarShareUpdatedEvent $event) use ($container) {
+			/** @var Backend $backend */
+			$backend = $container->query(Backend::class);
+			$backend->onCalendarUpdateShares(
+				$event->getCalendarData(),
+				$event->getOldShares(),
+				$event->getAdded(),
+				$event->getRemoved()
+			);
+
+			// Here we should recalculate if reminders should be sent to new or old sharees
+		});
+	}
+
+	public function registerContactsManager(IContactsManager $cm, IAppContainer $container): void {
+		$cm->register(function () use ($container, $cm): void {
+			$user = \OC::$server->getUserSession()->getUser();
+			if (!is_null($user)) {
+				$this->setupContactsProvider($cm, $container, $user->getUID());
+			} else {
+				$this->setupSystemContactsProvider($cm, $container);
+			}
+		});
+	}
+
+	private function setupContactsProvider(IContactsManager $contactsManager,
+		IAppContainer $container,
+		string $userID): void {
+		/** @var ContactsManager $cm */
+		$cm = $container->query(ContactsManager::class);
+		$urlGenerator = $container->getServer()->getURLGenerator();
+		$cm->setupContactsProvider($contactsManager, $userID, $urlGenerator);
+	}
+
+	private function setupSystemContactsProvider(IContactsManager $contactsManager,
+		IAppContainer $container): void {
+		/** @var ContactsManager $cm */
+		$cm = $container->query(ContactsManager::class);
+		$urlGenerator = $container->getServer()->getURLGenerator();
+		$cm->setupSystemContactsProvider($contactsManager, $urlGenerator);
+	}
+
+	public function registerCalendarManager(ICalendarManager $calendarManager,
+		IAppContainer $container): void {
+		$calendarManager->register(function () use ($container, $calendarManager) {
+			$user = \OC::$server->getUserSession()->getUser();
+			if ($user !== null) {
+				$this->setupCalendarProvider($calendarManager, $container, $user->getUID());
+			}
+		});
+	}
+
+	private function setupCalendarProvider(ICalendarManager $calendarManager,
+		IAppContainer $container,
+		$userId) {
+		$cm = $container->query(CalendarManager::class);
+		$cm->setupCalendarProvider($calendarManager, $userId);
+	}
+
+	public function registerCalendarReminders(NotificationProviderManager $manager,
+		LoggerInterface $logger): void {
+		try {
+			$manager->registerProvider(AudioProvider::class);
+			$manager->registerProvider(EmailProvider::class);
+			$manager->registerProvider(PushProvider::class);
+		} catch (Throwable $ex) {
+			$logger->error($ex->getMessage(), ['exception' => $ex]);
+		}
+	}
+}

wedding-pics/apps/dav/lib/AppInfo/PluginManager.php

@@ -0,0 +1,326 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2016, ownCloud GmbH.
+ *
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ * @author Julius Härtl <jus@bitgrid.net>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Vincent Petry <vincent@nextcloud.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\AppInfo;
+
+use OC\ServerContainer;
+use OCA\DAV\CalDAV\AppCalendar\AppCalendarPlugin;
+use OCA\DAV\CalDAV\Integration\ICalendarProvider;
+use OCA\DAV\CardDAV\Integration\IAddressBookProvider;
+use OCP\App\IAppManager;
+use OCP\AppFramework\QueryException;
+use Sabre\DAV\Collection;
+use Sabre\DAV\ServerPlugin;
+use function array_map;
+use function class_exists;
+use function is_array;
+
+/**
+ * Manager for DAV plugins from apps, used to register them
+ * to the Sabre server.
+ */
+class PluginManager {
+
+	/**
+	 * @var ServerContainer
+	 */
+	private $container;
+
+	/**
+	 * @var IAppManager
+	 */
+	private $appManager;
+
+	/**
+	 * App plugins
+	 *
+	 * @var ServerPlugin[]
+	 */
+	private $plugins = [];
+
+	/**
+	 * App collections
+	 *
+	 * @var Collection[]
+	 */
+	private $collections = [];
+
+	/**
+	 * Address book plugins
+	 *
+	 * @var IAddressBookProvider[]
+	 */
+	private $addressBookPlugins = [];
+
+	/**
+	 * Calendar plugins
+	 *
+	 * @var ICalendarProvider[]
+	 */
+	private $calendarPlugins = [];
+
+	/** @var bool */
+	private $populated = false;
+
+	/**
+	 * Contstruct a PluginManager
+	 *
+	 * @param ServerContainer $container server container for resolving plugin classes
+	 * @param IAppManager $appManager app manager to loading apps and their info
+	 */
+	public function __construct(ServerContainer $container, IAppManager $appManager) {
+		$this->container = $container;
+		$this->appManager = $appManager;
+	}
+
+	/**
+	 * Returns an array of app-registered plugins
+	 *
+	 * @return ServerPlugin[]
+	 */
+	public function getAppPlugins() {
+		$this->populate();
+		return $this->plugins;
+	}
+
+	/**
+	 * Returns an array of app-registered collections
+	 *
+	 * @return array
+	 */
+	public function getAppCollections() {
+		$this->populate();
+		return $this->collections;
+	}
+
+	/**
+	 * @return IAddressBookProvider[]
+	 */
+	public function getAddressBookPlugins(): array {
+		$this->populate();
+		return $this->addressBookPlugins;
+	}
+
+	/**
+	 * Returns an array of app-registered calendar plugins
+	 *
+	 * @return ICalendarProvider[]
+	 */
+	public function getCalendarPlugins():array {
+		$this->populate();
+		return $this->calendarPlugins;
+	}
+
+	/**
+	 * Retrieve plugin and collection list and populate attributes
+	 */
+	private function populate(): void {
+		if ($this->populated) {
+			return;
+		}
+		$this->populated = true;
+
+		$this->calendarPlugins[] = $this->container->get(AppCalendarPlugin::class);
+
+		foreach ($this->appManager->getInstalledApps() as $app) {
+			// load plugins and collections from info.xml
+			$info = $this->appManager->getAppInfo($app);
+			if (!isset($info['types']) || !in_array('dav', $info['types'], true)) {
+				continue;
+			}
+			$plugins = $this->loadSabrePluginsFromInfoXml($this->extractPluginList($info));
+			foreach ($plugins as $plugin) {
+				$this->plugins[] = $plugin;
+			}
+
+			$collections = $this->loadSabreCollectionsFromInfoXml($this->extractCollectionList($info));
+			foreach ($collections as $collection) {
+				$this->collections[] = $collection;
+			}
+
+			$addresbookPlugins = $this->loadSabreAddressBookPluginsFromInfoXml($this->extractAddressBookPluginList($info));
+			foreach ($addresbookPlugins as $addresbookPlugin) {
+				$this->addressBookPlugins[] = $addresbookPlugin;
+			}
+
+			$calendarPlugins = $this->loadSabreCalendarPluginsFromInfoXml($this->extractCalendarPluginList($info));
+			foreach ($calendarPlugins as $calendarPlugin) {
+				$this->calendarPlugins[] = $calendarPlugin;
+			}
+		}
+	}
+
+	/**
+	 * @param array $array
+	 * @return string[]
+	 */
+	private function extractPluginList(array $array): array {
+		if (isset($array['sabre']) && is_array($array['sabre'])) {
+			if (isset($array['sabre']['plugins']) && is_array($array['sabre']['plugins'])) {
+				if (isset($array['sabre']['plugins']['plugin'])) {
+					$items = $array['sabre']['plugins']['plugin'];
+					if (!is_array($items)) {
+						$items = [$items];
+					}
+					return $items;
+				}
+			}
+		}
+		return [];
+	}
+
+	/**
+	 * @param array $array
+	 * @return string[]
+	 */
+	private function extractCollectionList(array $array): array {
+		if (isset($array['sabre']) && is_array($array['sabre'])) {
+			if (isset($array['sabre']['collections']) && is_array($array['sabre']['collections'])) {
+				if (isset($array['sabre']['collections']['collection'])) {
+					$items = $array['sabre']['collections']['collection'];
+					if (!is_array($items)) {
+						$items = [$items];
+					}
+					return $items;
+				}
+			}
+		}
+		return [];
+	}
+
+	/**
+	 * @param array $array
+	 * @return string[]
+	 */
+	private function extractAddressBookPluginList(array $array): array {
+		if (!isset($array['sabre']) || !is_array($array['sabre'])) {
+			return [];
+		}
+		if (!isset($array['sabre']['address-book-plugins']) || !is_array($array['sabre']['address-book-plugins'])) {
+			return [];
+		}
+		if (!isset($array['sabre']['address-book-plugins']['plugin'])) {
+			return [];
+		}
+
+		$items = $array['sabre']['address-book-plugins']['plugin'];
+		if (!is_array($items)) {
+			$items = [$items];
+		}
+		return $items;
+	}
+
+	/**
+	 * @param array $array
+	 * @return string[]
+	 */
+	private function extractCalendarPluginList(array $array): array {
+		if (isset($array['sabre']) && is_array($array['sabre'])) {
+			if (isset($array['sabre']['calendar-plugins']) && is_array($array['sabre']['calendar-plugins'])) {
+				if (isset($array['sabre']['calendar-plugins']['plugin'])) {
+					$items = $array['sabre']['calendar-plugins']['plugin'];
+					if (!is_array($items)) {
+						$items = [$items];
+					}
+					return $items;
+				}
+			}
+		}
+		return [];
+	}
+
+	private function createClass(string $className): object {
+		try {
+			return $this->container->get($className);
+		} catch (QueryException $e) {
+			if (class_exists($className)) {
+				return new $className();
+			}
+		}
+
+		throw new \Exception('Could not load ' . $className, 0, $e);
+	}
+
+
+	/**
+	 * @param string[] $classes
+	 * @return ServerPlugin[]
+	 * @throws \Exception
+	 */
+	private function loadSabrePluginsFromInfoXml(array $classes): array {
+		return array_map(function (string $className): ServerPlugin {
+			$instance = $this->createClass($className);
+			if (!($instance instanceof ServerPlugin)) {
+				throw new \Exception('Sabre server plugin ' . $className . ' does not implement the ' . ServerPlugin::class . ' interface');
+			}
+			return $instance;
+		}, $classes);
+	}
+
+	/**
+	 * @param string[] $classes
+	 * @return Collection[]
+	 */
+	private function loadSabreCollectionsFromInfoXml(array $classes): array {
+		return array_map(function (string $className): Collection {
+			$instance = $this->createClass($className);
+			if (!($instance instanceof Collection)) {
+				throw new \Exception('Sabre collection plugin ' . $className . ' does not implement the ' . Collection::class . ' interface');
+			}
+			return $instance;
+		}, $classes);
+	}
+
+	/**
+	 * @param string[] $classes
+	 * @return IAddressBookProvider[]
+	 */
+	private function loadSabreAddressBookPluginsFromInfoXml(array $classes): array {
+		return array_map(function (string $className): IAddressBookProvider {
+			$instance = $this->createClass($className);
+			if (!($instance instanceof IAddressBookProvider)) {
+				throw new \Exception('Sabre address book plugin class ' . $className . ' does not implement the ' . IAddressBookProvider::class . ' interface');
+			}
+			return $instance;
+		}, $classes);
+	}
+
+	/**
+	 * @param string[] $classes
+	 * @return ICalendarProvider[]
+	 */
+	private function loadSabreCalendarPluginsFromInfoXml(array $classes): array {
+		return array_map(function (string $className): ICalendarProvider {
+			$instance = $this->createClass($className);
+			if (!($instance instanceof ICalendarProvider)) {
+				throw new \Exception('Sabre calendar plugin class ' . $className . ' does not implement the ' . ICalendarProvider::class . ' interface');
+			}
+			return $instance;
+		}, $classes);
+	}
+}