server/lib/private/server.php

<?php
/**
 * @author Arthur Schiwon <blizzz@owncloud.com>
 * @author Bart Visscher <bartv@thisnet.nl>
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @author Bernhard Reiter <ockham@raz.or.at>
 * @author Björn Schießle <schiessle@owncloud.com>
 * @author Christopher Schäpers <kondou@ts.unde.re>
 * @author Individual IT Services <info@individual-it.net>
 * @author Joas Schilling <nickvergessen@owncloud.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@owncloud.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <icewind@owncloud.com>
 * @author Robin McCorkell <robin@mccorkell.me.uk>
 * @author Roeland Jago Douma <rullzer@owncloud.com>
 * @author Sander <brantje@gmail.com>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Thomas Tanghus <thomas@tanghus.net>
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 * @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 OC;

use bantu\IniGetWrapper\IniGetWrapper;
use OC\AppFramework\Http\Request;
use OC\AppFramework\Db\Db;
use OC\AppFramework\Utility\SimpleContainer;
use OC\AppFramework\Utility\TimeFactory;
use OC\Command\AsyncBus;
use OC\Diagnostics\EventLogger;
use OC\Diagnostics\NullEventLogger;
use OC\Diagnostics\NullQueryLogger;
use OC\Diagnostics\QueryLogger;
use OC\Files\Config\UserMountCache;
use OC\Files\Config\UserMountCacheListener;
use OC\Files\Node\HookConnector;
use OC\Files\Node\Root;
use OC\Files\View;
use OC\Http\Client\ClientService;
use OC\IntegrityCheck\Checker;
use OC\IntegrityCheck\Helpers\AppLocator;
use OC\IntegrityCheck\Helpers\EnvironmentHelper;
use OC\IntegrityCheck\Helpers\FileAccessHelper;
use OC\Lock\DBLockingProvider;
use OC\Lock\MemcacheLockingProvider;
use OC\Lock\NoopLockingProvider;
use OC\Mail\Mailer;
use OC\Notification\Manager;
use OC\Security\CertificateManager;
use OC\Security\CSP\ContentSecurityPolicyManager;
use OC\Security\Crypto;
use OC\Security\CSRF\CsrfTokenGenerator;
use OC\Security\CSRF\CsrfTokenManager;
use OC\Security\CSRF\TokenStorage\SessionStorage;
use OC\Security\Hasher;
use OC\Security\CredentialsManager;
use OC\Security\SecureRandom;
use OC\Security\TrustedDomainHelper;
use OC\Session\CryptoWrapper;
use OC\Tagging\TagMapper;
use OCP\IServerContainer;
use OCP\Security\IContentSecurityPolicyManager;
use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

/**
 * Class Server
 *
 * @package OC
 *
 * TODO: hookup all manager classes
 */
class Server extends ServerContainer implements IServerContainer {
	/** @var string */
	private $webRoot;

	/**
	 * @param string $webRoot
	 * @param \OC\Config $config
	 */
	public function __construct($webRoot, \OC\Config $config) {
		parent::__construct();
		$this->webRoot = $webRoot;

		$this->registerService('ContactsManager', function ($c) {
			return new ContactsManager();
		});

		$this->registerService('PreviewManager', function (Server $c) {
			return new PreviewManager($c->getConfig());
		});

		$this->registerService('EncryptionManager', function (Server $c) {
			$view = new View();
			$util = new Encryption\Util(
				$view,
				$c->getUserManager(),
				$c->getGroupManager(),
				$c->getConfig()
			);
			return new Encryption\Manager(
				$c->getConfig(),
				$c->getLogger(),
				$c->getL10N('core'),
				new View(),
				$util
			);
		});

		$this->registerService('EncryptionFileHelper', function (Server $c) {
			$util = new Encryption\Util(
				new View(),
				$c->getUserManager(),
				$c->getGroupManager(),
				$c->getConfig()
			);
			return new Encryption\File($util);
		});

		$this->registerService('EncryptionKeyStorage', function (Server $c) {
			$view = new View();
			$util = new Encryption\Util(
				$view,
				$c->getUserManager(),
				$c->getGroupManager(),
				$c->getConfig()
			);

			return new Encryption\Keys\Storage($view, $util);
		});
		$this->registerService('TagMapper', function (Server $c) {
			return new TagMapper($c->getDatabaseConnection());
		});
		$this->registerService('TagManager', function (Server $c) {
			$tagMapper = $c->query('TagMapper');
			return new TagManager($tagMapper, $c->getUserSession());
		});
		$this->registerService('SystemTagManagerFactory', function (Server $c) {
			$config = $c->getConfig();
			$factoryClass = $config->getSystemValue('systemtags.managerFactory', '\OC\SystemTag\ManagerFactory');
			/** @var \OC\SystemTag\ManagerFactory $factory */
			$factory = new $factoryClass($this);
			return $factory;
		});
		$this->registerService('SystemTagManager', function (Server $c) {
			return $c->query('SystemTagManagerFactory')->getManager();
		});
		$this->registerService('SystemTagObjectMapper', function (Server $c) {
			return $c->query('SystemTagManagerFactory')->getObjectMapper();
		});
		$this->registerService('RootFolder', function (Server $c) {
			$manager = \OC\Files\Filesystem::getMountManager(null);
			$view = new View();
			$root = new Root($manager, $view, null);
			$connector = new HookConnector($root, $view);
			$connector->viewToNode();
			return $root;
		});
		$this->registerService('UserManager', function (Server $c) {
			$config = $c->getConfig();
			return new \OC\User\Manager($config);
		});
		$this->registerService('GroupManager', function (Server $c) {
			$groupManager = new \OC\Group\Manager($this->getUserManager());
			$groupManager->listen('\OC\Group', 'preCreate', function ($gid) {
				\OC_Hook::emit('OC_Group', 'pre_createGroup', array('run' => true, 'gid' => $gid));
			});
			$groupManager->listen('\OC\Group', 'postCreate', function (\OC\Group\Group $gid) {
				\OC_Hook::emit('OC_User', 'post_createGroup', array('gid' => $gid->getGID()));
			});
			$groupManager->listen('\OC\Group', 'preDelete', function (\OC\Group\Group $group) {
				\OC_Hook::emit('OC_Group', 'pre_deleteGroup', array('run' => true, 'gid' => $group->getGID()));
			});
			$groupManager->listen('\OC\Group', 'postDelete', function (\OC\Group\Group $group) {
				\OC_Hook::emit('OC_User', 'post_deleteGroup', array('gid' => $group->getGID()));
			});
			$groupManager->listen('\OC\Group', 'preAddUser', function (\OC\Group\Group $group, \OC\User\User $user) {
				\OC_Hook::emit('OC_Group', 'pre_addToGroup', array('run' => true, 'uid' => $user->getUID(), 'gid' => $group->getGID()));
			});
			$groupManager->listen('\OC\Group', 'postAddUser', function (\OC\Group\Group $group, \OC\User\User $user) {
				\OC_Hook::emit('OC_Group', 'post_addToGroup', array('uid' => $user->getUID(), 'gid' => $group->getGID()));
				//Minimal fix to keep it backward compatible TODO: clean up all the GroupManager hooks
				\OC_Hook::emit('OC_User', 'post_addToGroup', array('uid' => $user->getUID(), 'gid' => $group->getGID()));
			});
			return $groupManager;
		});
		$this->registerService('UserSession', function (Server $c) {
			$manager = $c->getUserManager();

			$session = new \OC\Session\Memory('');

			$userSession = new \OC\User\Session($manager, $session);
			$userSession->listen('\OC\User', 'preCreateUser', function ($uid, $password) {
				\OC_Hook::emit('OC_User', 'pre_createUser', array('run' => true, 'uid' => $uid, 'password' => $password));
			});
			$userSession->listen('\OC\User', 'postCreateUser', function ($user, $password) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'post_createUser', array('uid' => $user->getUID(), 'password' => $password));
			});
			$userSession->listen('\OC\User', 'preDelete', function ($user) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'pre_deleteUser', array('run' => true, 'uid' => $user->getUID()));
			});
			$userSession->listen('\OC\User', 'postDelete', function ($user) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'post_deleteUser', array('uid' => $user->getUID()));
			});
			$userSession->listen('\OC\User', 'preSetPassword', function ($user, $password, $recoveryPassword) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'pre_setPassword', array('run' => true, 'uid' => $user->getUID(), 'password' => $password, 'recoveryPassword' => $recoveryPassword));
			});
			$userSession->listen('\OC\User', 'postSetPassword', function ($user, $password, $recoveryPassword) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'post_setPassword', array('run' => true, 'uid' => $user->getUID(), 'password' => $password, 'recoveryPassword' => $recoveryPassword));
			});
			$userSession->listen('\OC\User', 'preLogin', function ($uid, $password) {
				\OC_Hook::emit('OC_User', 'pre_login', array('run' => true, 'uid' => $uid, 'password' => $password));
			});
			$userSession->listen('\OC\User', 'postLogin', function ($user, $password) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'post_login', array('run' => true, 'uid' => $user->getUID(), 'password' => $password));
			});
			$userSession->listen('\OC\User', 'logout', function () {
				\OC_Hook::emit('OC_User', 'logout', array());
			});
			$userSession->listen('\OC\User', 'changeUser', function ($user, $feature, $value) {
				/** @var $user \OC\User\User */
				\OC_Hook::emit('OC_User', 'changeUser', array('run' => true, 'user' => $user, 'feature' => $feature, 'value' => $value));
			});
			return $userSession;
		});
		$this->registerService('NavigationManager', function ($c) {
			return new \OC\NavigationManager();
		});
		$this->registerService('AllConfig', function (Server $c) {
			return new \OC\AllConfig(
				$c->getSystemConfig()
			);
		});
		$this->registerService('SystemConfig', function ($c) use ($config) {
			return new \OC\SystemConfig($config);
		});
		$this->registerService('AppConfig', function (Server $c) {
			return new \OC\AppConfig($c->getDatabaseConnection());
		});
		$this->registerService('L10NFactory', function (Server $c) {
			return new \OC\L10N\Factory(
				$c->getConfig(),
				$c->getRequest(),
				$c->getUserSession()
			);
		});
		$this->registerService('URLGenerator', function (Server $c) {
			$config = $c->getConfig();
			$cacheFactory = $c->getMemCacheFactory();
			return new \OC\URLGenerator(
				$config,
				$cacheFactory
			);
		});
		$this->registerService('AppHelper', function ($c) {
			return new \OC\AppHelper();
		});
		$this->registerService('UserCache', function ($c) {
			return new Cache\File();
		});
		$this->registerService('MemCacheFactory', function (Server $c) {
			$config = $c->getConfig();

			if ($config->getSystemValue('installed', false) && !(defined('PHPUNIT_RUN') && PHPUNIT_RUN)) {
				$v = \OC_App::getAppVersions();
				$v['core'] = md5(file_get_contents(\OC::$SERVERROOT . '/version.php'));
				$version = implode(',', $v);
				$instanceId = \OC_Util::getInstanceId();
				$path = \OC::$SERVERROOT;
				$prefix = md5($instanceId . '-' . $version . '-' . $path);
				return new \OC\Memcache\Factory($prefix, $c->getLogger(),
					$config->getSystemValue('memcache.local', null),
					$config->getSystemValue('memcache.distributed', null),
					$config->getSystemValue('memcache.locking', null)
				);
			}

			return new \OC\Memcache\Factory('', $c->getLogger(),
				'\\OC\\Memcache\\ArrayCache',
				'\\OC\\Memcache\\ArrayCache',
				'\\OC\\Memcache\\ArrayCache'
			);
		});
		$this->registerService('ActivityManager', function (Server $c) {
			return new ActivityManager(
				$c->getRequest(),
				$c->getUserSession(),
				$c->getConfig()
			);
		});
		$this->registerService('AvatarManager', function (Server $c) {
			return new AvatarManager(
				$c->getUserManager(),
				$c->getRootFolder(),
				$c->getL10N('lib')
			);
		});
		$this->registerService('Logger', function (Server $c) {
			$logClass = $c->query('AllConfig')->getSystemValue('log_type', 'owncloud');
			$logger = 'OC_Log_' . ucfirst($logClass);
			call_user_func(array($logger, 'init'));

			return new Log($logger);
		});
		$this->registerService('JobList', function (Server $c) {
			$config = $c->getConfig();
			return new \OC\BackgroundJob\JobList($c->getDatabaseConnection(), $config);
		});
		$this->registerService('Router', function (Server $c) {
			$cacheFactory = $c->getMemCacheFactory();
			$logger = $c->getLogger();
			if ($cacheFactory->isAvailable()) {
				$router = new \OC\Route\CachingRouter($cacheFactory->create('route'), $logger);
			} else {
				$router = new \OC\Route\Router($logger);
			}
			return $router;
		});
		$this->registerService('Search', function ($c) {
			return new Search();
		});
		$this->registerService('SecureRandom', function ($c) {
			return new SecureRandom();
		});
		$this->registerService('Crypto', function (Server $c) {
			return new Crypto($c->getConfig(), $c->getSecureRandom());
		});
		$this->registerService('Hasher', function (Server $c) {
			return new Hasher($c->getConfig());
		});
		$this->registerService('CredentialsManager', function (Server $c) {
			return new CredentialsManager($c->getCrypto(), $c->getDatabaseConnection());
		});
		$this->registerService('DatabaseConnection', function (Server $c) {
			$factory = new \OC\DB\ConnectionFactory();
			$systemConfig = $c->getSystemConfig();
			$type = $systemConfig->getValue('dbtype', 'sqlite');
			if (!$factory->isValidType($type)) {
				throw new \OC\DatabaseException('Invalid database type');
			}
			$connectionParams = $factory->createConnectionParams($systemConfig);
			$connection = $factory->getConnection($type, $connectionParams);
			$connection->getConfiguration()->setSQLLogger($c->getQueryLogger());
			return $connection;
		});
		$this->registerService('Db', function (Server $c) {
			return new Db($c->getDatabaseConnection());
		});
		$this->registerService('HTTPHelper', function (Server $c) {
			$config = $c->getConfig();
			return new HTTPHelper(
				$config,
				$c->getHTTPClientService()
			);
		});
		$this->registerService('HttpClientService', function (Server $c) {
			$user = \OC_User::getUser();
			$uid = $user ? $user : null;
			return new ClientService(
				$c->getConfig(),
				new \OC\Security\CertificateManager($uid, new View(), $c->getConfig())
			);
		});
		$this->registerService('EventLogger', function (Server $c) {
			if ($c->getSystemConfig()->getValue('debug', false)) {
				return new EventLogger();
			} else {
				return new NullEventLogger();
			}
		});
		$this->registerService('QueryLogger', function (Server $c) {
			if ($c->getSystemConfig()->getValue('debug', false)) {
				return new QueryLogger();
			} else {
				return new NullQueryLogger();
			}
		});
		$this->registerService('TempManager', function (Server $c) {
			return new TempManager(
				$c->getLogger(),
				$c->getConfig()
			);
		});
		$this->registerService('AppManager', function (Server $c) {
			return new \OC\App\AppManager(
				$c->getUserSession(),
				$c->getAppConfig(),
				$c->getGroupManager(),
				$c->getMemCacheFactory(),
				$c->getEventDispatcher()
			);
		});
		$this->registerService('DateTimeZone', function (Server $c) {
			return new DateTimeZone(
				$c->getConfig(),
				$c->getSession()
			);
		});
		$this->registerService('DateTimeFormatter', function (Server $c) {
			$language = $c->getConfig()->getUserValue($c->getSession()->get('user_id'), 'core', 'lang', null);

			return new DateTimeFormatter(
				$c->getDateTimeZone()->getTimeZone(),
				$c->getL10N('lib', $language)
			);
		});
		$this->registerService('UserMountCache', function (Server $c) {
			$mountCache = new UserMountCache($c->getDatabaseConnection(), $c->getUserManager(), $c->getLogger());
			$listener = new UserMountCacheListener($mountCache);
			$listener->listen($c->getUserManager());
			return $mountCache;
		});
		$this->registerService('MountConfigManager', function (Server $c) {
			$loader = \OC\Files\Filesystem::getLoader();
			$mountCache = $c->query('UserMountCache');
			return new \OC\Files\Config\MountProviderCollection($loader, $mountCache);
		});
		$this->registerService('IniWrapper', function ($c) {
			return new IniGetWrapper();
		});
		$this->registerService('AsyncCommandBus', function (Server $c) {
			$jobList = $c->getJobList();
			return new AsyncBus($jobList);
		});
		$this->registerService('TrustedDomainHelper', function ($c) {
			return new TrustedDomainHelper($this->getConfig());
		});
		$this->registerService('IntegrityCodeChecker', function (Server $c) {
			// IConfig and IAppManager requires a working database. This code
			// might however be called when ownCloud is not yet setup.
			if(\OC::$server->getSystemConfig()->getValue('installed', false)) {
				$config = $c->getConfig();
				$appManager = $c->getAppManager();
			} else {
				$config = null;
				$appManager = null;
			}

			return new Checker(
					new EnvironmentHelper(),
					new FileAccessHelper(),
					new AppLocator(),
					$config,
					$c->getMemCacheFactory(),
					$appManager
			);
		});
		$this->registerService('Request', function ($c) {
			if (isset($this['urlParams'])) {
				$urlParams = $this['urlParams'];
			} else {
				$urlParams = [];
			}

			if (defined('PHPUNIT_RUN') && PHPUNIT_RUN
				&& in_array('fakeinput', stream_get_wrappers())
			) {
				$stream = 'fakeinput://data';
			} else {
				$stream = 'php://input';
			}

			return new Request(
				[
					'get' => $_GET,
					'post' => $_POST,
					'files' => $_FILES,
					'server' => $_SERVER,
					'env' => $_ENV,
					'cookies' => $_COOKIE,
					'method' => (isset($_SERVER) && isset($_SERVER['REQUEST_METHOD']))
						? $_SERVER['REQUEST_METHOD']
						: null,
					'urlParams' => $urlParams,
				],
				$this->getSecureRandom(),
				$this->getConfig(),
				$this->getCsrfTokenManager(),
				$stream
			);
		});
		$this->registerService('Mailer', function (Server $c) {
			return new Mailer(
				$c->getConfig(),
				$c->getLogger(),
				new \OC_Defaults()
			);
		});
		$this->registerService('OcsClient', function (Server $c) {
			return new OCSClient(
				$this->getHTTPClientService(),
				$this->getConfig(),
				$this->getLogger()
			);
		});
		$this->registerService('LockingProvider', function (Server $c) {
			if ($c->getConfig()->getSystemValue('filelocking.enabled', true) or (defined('PHPUNIT_RUN') && PHPUNIT_RUN)) {
				/** @var \OC\Memcache\Factory $memcacheFactory */
				$memcacheFactory = $c->getMemCacheFactory();
				$memcache = $memcacheFactory->createLocking('lock');
				if (!($memcache instanceof \OC\Memcache\NullCache)) {
					return new MemcacheLockingProvider($memcache);
				}
				return new DBLockingProvider($c->getDatabaseConnection(), $c->getLogger(), new TimeFactory());
			}
			return new NoopLockingProvider();
		});
		$this->registerService('MountManager', function () {
			return new \OC\Files\Mount\Manager();
		});
		$this->registerService('MimeTypeDetector', function (Server $c) {
			return new \OC\Files\Type\Detection(
				$c->getURLGenerator(),
				\OC::$SERVERROOT . '/config/',
				\OC::$SERVERROOT . '/resources/config/'
			);
		});
		$this->registerService('MimeTypeLoader', function (Server $c) {
			return new \OC\Files\Type\Loader(
				$c->getDatabaseConnection()
			);
		});
		$this->registerService('NotificationManager', function () {
			return new Manager();
		});
		$this->registerService('CapabilitiesManager', function (Server $c) {
			$manager = new \OC\CapabilitiesManager();
			$manager->registerCapability(function () use ($c) {
				return new \OC\OCS\CoreCapabilities($c->getConfig());
			});
			return $manager;
		});
		$this->registerService('CommentsManager', function(Server $c) {
			$config = $c->getConfig();
			$factoryClass = $config->getSystemValue('comments.managerFactory', '\OC\Comments\ManagerFactory');
			/** @var \OCP\Comments\ICommentsManagerFactory $factory */
			$factory = new $factoryClass($this);
			return $factory->getManager();
		});
		$this->registerService('EventDispatcher', function () {
			return new EventDispatcher();
		});
		$this->registerService('CryptoWrapper', function (Server $c) {
			// FIXME: Instantiiated here due to cyclic dependency
			$request = new Request(
				[
					'get' => $_GET,
					'post' => $_POST,
					'files' => $_FILES,
					'server' => $_SERVER,
					'env' => $_ENV,
					'cookies' => $_COOKIE,
					'method' => (isset($_SERVER) && isset($_SERVER['REQUEST_METHOD']))
						? $_SERVER['REQUEST_METHOD']
						: null,
				],
				$c->getSecureRandom(),
				$c->getConfig()
			);

			return new CryptoWrapper(
				$c->getConfig(),
				$c->getCrypto(),
				$c->getSecureRandom(),
				$request
			);
		});
		$this->registerService('CsrfTokenManager', function (Server $c) {
			$tokenGenerator = new CsrfTokenGenerator($c->getSecureRandom());
			$sessionStorage = new SessionStorage($c->getSession());

			return new CsrfTokenManager(
				$tokenGenerator,
				$sessionStorage
			);
		});
		$this->registerService('ContentSecurityPolicyManager', function (Server $c) {
			return new ContentSecurityPolicyManager();
		});
		$this->registerService('ShareManager', function(Server $c) {
			$config = $c->getConfig();
			$factoryClass = $config->getSystemValue('sharing.managerFactory', '\OC\Share20\ProviderFactory');
			/** @var \OC\Share20\IProviderFactory $factory */
			$factory = new $factoryClass($this);

			$manager = new \OC\Share20\Manager(
				$c->getLogger(),
				$c->getConfig(),
				$c->getSecureRandom(),
				$c->getHasher(),
				$c->getMountManager(),
				$c->getGroupManager(),
				$c->getL10N('core'),
				$factory,
				$c->getUserManager(),
				$c->getRootFolder()
			);

			return $manager;
		});
	}

	/**
	 * @return \OCP\Contacts\IManager
	 */
	public function getContactsManager() {
		return $this->query('ContactsManager');
	}

	/**
	 * @return \OC\Encryption\Manager
	 */
	public function getEncryptionManager() {
		return $this->query('EncryptionManager');
	}

	/**
	 * @return \OC\Encryption\File
	 */
	public function getEncryptionFilesHelper() {
		return $this->query('EncryptionFileHelper');
	}

	/**
	 * @return \OCP\Encryption\Keys\IStorage
	 */
	public function getEncryptionKeyStorage() {
		return $this->query('EncryptionKeyStorage');
	}

	/**
	 * The current request object holding all information about the request
	 * currently being processed is returned from this method.
	 * In case the current execution was not initiated by a web request null is returned
	 *
	 * @return \OCP\IRequest
	 */
	public function getRequest() {
		return $this->query('Request');
	}

	/**
	 * Returns the preview manager which can create preview images for a given file
	 *
	 * @return \OCP\IPreview
	 */
	public function getPreviewManager() {
		return $this->query('PreviewManager');
	}

	/**
	 * Returns the tag manager which can get and set tags for different object types
	 *
	 * @see \OCP\ITagManager::load()
	 * @return \OCP\ITagManager
	 */
	public function getTagManager() {
		return $this->query('TagManager');
	}

	/**
	 * Returns the system-tag manager
	 *
	 * @return \OCP\SystemTag\ISystemTagManager
	 *
	 * @since 9.0.0
	 */
	public function getSystemTagManager() {
		return $this->query('SystemTagManager');
	}

	/**
	 * Returns the system-tag object mapper
	 *
	 * @return \OCP\SystemTag\ISystemTagObjectMapper
	 *
	 * @since 9.0.0
	 */
	public function getSystemTagObjectMapper() {
		return $this->query('SystemTagObjectMapper');
	}


	/**
	 * Returns the avatar manager, used for avatar functionality
	 *
	 * @return \OCP\IAvatarManager
	 */
	public function getAvatarManager() {
		return $this->query('AvatarManager');
	}

	/**
	 * Returns the root folder of ownCloud's data directory
	 *
	 * @return \OCP\Files\IRootFolder
	 */
	public function getRootFolder() {
		return $this->query('RootFolder');
	}

	/**
	 * Returns a view to ownCloud's files folder
	 *
	 * @param string $userId user ID
	 * @return \OCP\Files\Folder|null
	 */
	public function getUserFolder($userId = null) {
		if ($userId === null) {
			$user = $this->getUserSession()->getUser();
			if (!$user) {
				return null;
			}
			$userId = $user->getUID();
		}
		$root = $this->getRootFolder();
		return $root->getUserFolder($userId);
	}

	/**
	 * Returns an app-specific view in ownClouds data directory
	 *
	 * @return \OCP\Files\Folder
	 */
	public function getAppFolder() {
		$dir = '/' . \OC_App::getCurrentApp();
		$root = $this->getRootFolder();
		if (!$root->nodeExists($dir)) {
			$folder = $root->newFolder($dir);
		} else {
			$folder = $root->get($dir);
		}
		return $folder;
	}

	/**
	 * @return \OC\User\Manager
	 */
	public function getUserManager() {
		return $this->query('UserManager');
	}

	/**
	 * @return \OC\Group\Manager
	 */
	public function getGroupManager() {
		return $this->query('GroupManager');
	}

	/**
	 * @return \OC\User\Session
	 */
	public function getUserSession() {
		return $this->query('UserSession');
	}

	/**
	 * @return \OCP\ISession
	 */
	public function getSession() {
		return $this->query('UserSession')->getSession();
	}

	/**
	 * @param \OCP\ISession $session
	 */
	public function setSession(\OCP\ISession $session) {
		return $this->query('UserSession')->setSession($session);
	}

	/**
	 * @return \OC\NavigationManager
	 */
	public function getNavigationManager() {
		return $this->query('NavigationManager');
	}

	/**
	 * @return \OCP\IConfig
	 */
	public function getConfig() {
		return $this->query('AllConfig');
	}

	/**
	 * For internal use only
	 *
	 * @return \OC\SystemConfig
	 */
	public function getSystemConfig() {
		return $this->query('SystemConfig');
	}

	/**
	 * Returns the app config manager
	 *
	 * @return \OCP\IAppConfig
	 */
	public function getAppConfig() {
		return $this->query('AppConfig');
	}

	/**
	 * @return \OCP\L10N\IFactory
	 */
	public function getL10NFactory() {
		return $this->query('L10NFactory');
	}

	/**
	 * get an L10N instance
	 *
	 * @param string $app appid
	 * @param string $lang
	 * @return \OC_L10N
	 */
	public function getL10N($app, $lang = null) {
		return $this->getL10NFactory()->get($app, $lang);
	}

	/**
	 * @return \OCP\IURLGenerator
	 */
	public function getURLGenerator() {
		return $this->query('URLGenerator');
	}

	/**
	 * @return \OCP\IHelper
	 */
	public function getHelper() {
		return $this->query('AppHelper');
	}

	/**
	 * Returns an ICache instance. Since 8.1.0 it returns a fake cache. Use
	 * getMemCacheFactory() instead.
	 *
	 * @return \OCP\ICache
	 * @deprecated 8.1.0 use getMemCacheFactory to obtain a proper cache
	 */
	public function getCache() {
		return $this->query('UserCache');
	}

	/**
	 * Returns an \OCP\CacheFactory instance
	 *
	 * @return \OCP\ICacheFactory
	 */
	public function getMemCacheFactory() {
		return $this->query('MemCacheFactory');
	}

	/**
	 * Returns the current session
	 *
	 * @return \OCP\IDBConnection
	 */
	public function getDatabaseConnection() {
		return $this->query('DatabaseConnection');
	}

	/**
	 * Returns the activity manager
	 *
	 * @return \OCP\Activity\IManager
	 */
	public function getActivityManager() {
		return $this->query('ActivityManager');
	}

	/**
	 * Returns an job list for controlling background jobs
	 *
	 * @return \OCP\BackgroundJob\IJobList
	 */
	public function getJobList() {
		return $this->query('JobList');
	}

	/**
	 * Returns a logger instance
	 *
	 * @return \OCP\ILogger
	 */
	public function getLogger() {
		return $this->query('Logger');
	}

	/**
	 * Returns a router for generating and matching urls
	 *
	 * @return \OCP\Route\IRouter
	 */
	public function getRouter() {
		return $this->query('Router');
	}

	/**
	 * Returns a search instance
	 *
	 * @return \OCP\ISearch
	 */
	public function getSearch() {
		return $this->query('Search');
	}

	/**
	 * Returns a SecureRandom instance
	 *
	 * @return \OCP\Security\ISecureRandom
	 */
	public function getSecureRandom() {
		return $this->query('SecureRandom');
	}

	/**
	 * Returns a Crypto instance
	 *
	 * @return \OCP\Security\ICrypto
	 */
	public function getCrypto() {
		return $this->query('Crypto');
	}

	/**
	 * Returns a Hasher instance
	 *
	 * @return \OCP\Security\IHasher
	 */
	public function getHasher() {
		return $this->query('Hasher');
	}

	/**
	 * Returns a CredentialsManager instance
	 *
	 * @return \OCP\Security\ICredentialsManager
	 */
	public function getCredentialsManager() {
		return $this->query('CredentialsManager');
	}

	/**
	 * Returns an instance of the db facade
	 *
	 * @deprecated use getDatabaseConnection, will be removed in ownCloud 10
	 * @return \OCP\IDb
	 */
	public function getDb() {
		return $this->query('Db');
	}

	/**
	 * Returns an instance of the HTTP helper class
	 *
	 * @deprecated Use getHTTPClientService()
	 * @return \OC\HTTPHelper
	 */
	public function getHTTPHelper() {
		return $this->query('HTTPHelper');
	}

	/**
	 * Get the certificate manager for the user
	 *
	 * @param string $userId (optional) if not specified the current loggedin user is used, use null to get the system certificate manager
	 * @return \OCP\ICertificateManager | null if $uid is null and no user is logged in
	 */
	public function getCertificateManager($userId = '') {
		if ($userId === '') {
			$userSession = $this->getUserSession();
			$user = $userSession->getUser();
			if (is_null($user)) {
				return null;
			}
			$userId = $user->getUID();
		}
		return new CertificateManager($userId, new View(), $this->getConfig());
	}

	/**
	 * Returns an instance of the HTTP client service
	 *
	 * @return \OCP\Http\Client\IClientService
	 */
	public function getHTTPClientService() {
		return $this->query('HttpClientService');
	}

	/**
	 * Create a new event source
	 *
	 * @return \OCP\IEventSource
	 */
	public function createEventSource() {
		return new \OC_EventSource();
	}

	/**
	 * Get the active event logger
	 *
	 * The returned logger only logs data when debug mode is enabled
	 *
	 * @return \OCP\Diagnostics\IEventLogger
	 */
	public function getEventLogger() {
		return $this->query('EventLogger');
	}

	/**
	 * Get the active query logger
	 *
	 * The returned logger only logs data when debug mode is enabled
	 *
	 * @return \OCP\Diagnostics\IQueryLogger
	 */
	public function getQueryLogger() {
		return $this->query('QueryLogger');
	}

	/**
	 * Get the manager for temporary files and folders
	 *
	 * @return \OCP\ITempManager
	 */
	public function getTempManager() {
		return $this->query('TempManager');
	}

	/**
	 * Get the app manager
	 *
	 * @return \OCP\App\IAppManager
	 */
	public function getAppManager() {
		return $this->query('AppManager');
	}

	/**
	 * Creates a new mailer
	 *
	 * @return \OCP\Mail\IMailer
	 */
	public function getMailer() {
		return $this->query('Mailer');
	}

	/**
	 * Get the webroot
	 *
	 * @return string
	 */
	public function getWebRoot() {
		return $this->webRoot;
	}

	/**
	 * @return \OC\OCSClient
	 */
	public function getOcsClient() {
		return $this->query('OcsClient');
	}

	/**
	 * @return \OCP\IDateTimeZone
	 */
	public function getDateTimeZone() {
		return $this->query('DateTimeZone');
	}

	/**
	 * @return \OCP\IDateTimeFormatter
	 */
	public function getDateTimeFormatter() {
		return $this->query('DateTimeFormatter');
	}

	/**
	 * @return \OCP\Files\Config\IMountProviderCollection
	 */
	public function getMountProviderCollection() {
		return $this->query('MountConfigManager');
	}

	/**
	 * Get the IniWrapper
	 *
	 * @return IniGetWrapper
	 */
	public function getIniWrapper() {
		return $this->query('IniWrapper');
	}

	/**
	 * @return \OCP\Command\IBus
	 */
	public function getCommandBus() {
		return $this->query('AsyncCommandBus');
	}

	/**
	 * Get the trusted domain helper
	 *
	 * @return TrustedDomainHelper
	 */
	public function getTrustedDomainHelper() {
		return $this->query('TrustedDomainHelper');
	}

	/**
	 * Get the locking provider
	 *
	 * @return \OCP\Lock\ILockingProvider
	 * @since 8.1.0
	 */
	public function getLockingProvider() {
		return $this->query('LockingProvider');
	}

	/**
	 * @return \OCP\Files\Mount\IMountManager
	 **/
	function getMountManager() {
		return $this->query('MountManager');
	}

	/*
	 * Get the MimeTypeDetector
	 *
	 * @return \OCP\Files\IMimeTypeDetector
	 */
	public function getMimeTypeDetector() {
		return $this->query('MimeTypeDetector');
	}

	/**
	 * Get the MimeTypeLoader
	 *
	 * @return \OCP\Files\IMimeTypeLoader
	 */
	public function getMimeTypeLoader() {
		return $this->query('MimeTypeLoader');
	}

	/**
	 * Get the manager of all the capabilities
	 *
	 * @return \OC\CapabilitiesManager
	 */
	public function getCapabilitiesManager() {
		return $this->query('CapabilitiesManager');
	}

	/**
	 * Get the EventDispatcher
	 *
	 * @return EventDispatcherInterface
	 * @since 8.2.0
	 */
	public function getEventDispatcher() {
		return $this->query('EventDispatcher');
	}

	/**
	 * Get the Notification Manager
	 *
	 * @return \OCP\Notification\IManager
	 * @since 8.2.0
	 */
	public function getNotificationManager() {
		return $this->query('NotificationManager');
	}

	/**
	 * @return \OCP\Comments\ICommentsManager
	 */
	public function getCommentsManager() {
		return $this->query('CommentsManager');
	}

	/**
	 * @return \OC\IntegrityCheck\Checker
	 */
	public function getIntegrityCodeChecker() {
		return $this->query('IntegrityCodeChecker');
	}

	/**
	 * @return \OC\Session\CryptoWrapper
	 */
	public function getSessionCryptoWrapper() {
		return $this->query('CryptoWrapper');
	}

	/**
	 * @return CsrfTokenManager
	 */
	public function getCsrfTokenManager() {
		return $this->query('CsrfTokenManager');
	}

	/**
	 * @return IContentSecurityPolicyManager
	 */
	public function getContentSecurityPolicyManager() {
		return $this->query('ContentSecurityPolicyManager');
	}

	/**
	 * Not a public API as of 8.2, wait for 9.0
	 *
	 * @return \OCA\Files_External\Service\BackendService
	 */
	public function getStoragesBackendService() {
		return \OC_Mount_Config::$app->getContainer()->query('OCA\\Files_External\\Service\\BackendService');
	}

	/**
	 * Not a public API as of 8.2, wait for 9.0
	 *
	 * @return \OCA\Files_External\Service\GlobalStoragesService
	 */
	public function getGlobalStoragesService() {
		return \OC_Mount_Config::$app->getContainer()->query('OCA\\Files_External\\Service\\GlobalStoragesService');
	}

	/**
	 * Not a public API as of 8.2, wait for 9.0
	 *
	 * @return \OCA\Files_External\Service\UserGlobalStoragesService
	 */
	public function getUserGlobalStoragesService() {
		return \OC_Mount_Config::$app->getContainer()->query('OCA\\Files_External\\Service\\UserGlobalStoragesService');
	}

	/**
	 * Not a public API as of 8.2, wait for 9.0
	 *
	 * @return \OCA\Files_External\Service\UserStoragesService
	 */
	public function getUserStoragesService() {
		return \OC_Mount_Config::$app->getContainer()->query('OCA\\Files_External\\Service\\UserStoragesService');
	}

	/**
	 * @return \OCP\Share\IManager
	 */
	public function getShareManager() {
		return $this->query('ShareManager');
	}

}