<?php
  /**
   * ownCloud
   *
   * @author Frank Karlitschek
   * @copyright 2012 Frank Karlitschek frank@owncloud.org
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
   * License as published by the Free Software Foundation; either
   * version 3 of the License, or any later version.
   *
   * This library 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 along with this library.  If not, see <http://www.gnu.org/licenses/>.
   *
   */
  
  require_once 'public/constants.php';
  
  /**
   * Class that is a namespace for all global OC variables
   * No, we can not put this class in its own file because it is used by
   * OC_autoload!
   */
  class OC {
  	/**
  	 * Associative array for autoloading. classname => filename
  	 */
  	public static $CLASSPATH = array();
  	/**
  	 * The installation path for owncloud on the server (e.g. /srv/http/owncloud)
  	 */
  	public static $SERVERROOT = '';
  	/**
  	 * the current request path relative to the owncloud root (e.g. files/index.php)
  	 */
  	private static $SUBURI = '';
  	/**
  	 * the owncloud root path for http requests (e.g. owncloud/)
  	 */
  	public static $WEBROOT = '';
  	/**
  	 * The installation path of the 3rdparty folder on the server (e.g. /srv/http/owncloud/3rdparty)
  	 */
  	public static $THIRDPARTYROOT = '';
  	/**
  	 * the root path of the 3rdparty folder for http requests (e.g. owncloud/3rdparty)
  	 */
  	public static $THIRDPARTYWEBROOT = '';
  	/**
  	 * The installation path array of the apps folder on the server (e.g. /srv/http/owncloud) 'path' and
  	 * web path in 'url'
  	 */
  	public static $APPSROOTS = array();

  
  	public static $configDir;
  
  	/**

  	 * requested app
  	 */
  	public static $REQUESTEDAPP = '';

  	/**
  	 * check if owncloud runs in cli mode
  	 */
  	public static $CLI = false;

  
  	/**

  	 * @var \OC\Session\Session

  	 */

  	public static $session = null;

  	/**
  	 * @var \OC\Autoloader $loader
  	 */
  	public static $loader = null;
  
  	/**
  	 * @var \OC\Server
  	 */
  	public static $server = null;

  
  	public static function initPaths() {
  		// calculate the root directories
  		OC::$SERVERROOT = str_replace("\\", '/', substr(__DIR__, 0, -4));
  
  		// ensure we can find OC_Config
  		set_include_path(
  			OC::$SERVERROOT . '/lib' . PATH_SEPARATOR .

  			get_include_path()

  		);

  		if(defined('PHPUNIT_CONFIG_DIR')) {
  			self::$configDir = OC::$SERVERROOT . '/' . PHPUNIT_CONFIG_DIR . '/';
  		} elseif(defined('PHPUNIT_RUN') and PHPUNIT_RUN and is_dir(OC::$SERVERROOT . '/tests/config/')) {
  			self::$configDir = OC::$SERVERROOT . '/tests/config/';
  		} else {
  			self::$configDir = OC::$SERVERROOT . '/config/';
  		}
  		OC_Config::$object = new \OC\Config(self::$configDir);

  		OC::$SUBURI = str_replace("\\", "/", substr(realpath($_SERVER["SCRIPT_FILENAME"]), strlen(OC::$SERVERROOT)));
  		$scriptName = OC_Request::scriptName();
  		if (substr($scriptName, -1) == '/') {
  			$scriptName .= 'index.php';
  			//make sure suburi follows the same rules as scriptName
  			if (substr(OC::$SUBURI, -9) != 'index.php') {
  				if (substr(OC::$SUBURI, -1) != '/') {
  					OC::$SUBURI = OC::$SUBURI . '/';
  				}
  				OC::$SUBURI = OC::$SUBURI . 'index.php';
  			}
  		}

  		if (substr($scriptName, 0 - strlen(OC::$SUBURI)) === OC::$SUBURI) {
  			OC::$WEBROOT = substr($scriptName, 0, 0 - strlen(OC::$SUBURI));

  			if (OC::$WEBROOT != '' && OC::$WEBROOT[0] !== '/') {
  				OC::$WEBROOT = '/' . OC::$WEBROOT;
  			}
  		} else {
  			// The scriptName is not ending with OC::$SUBURI
  			// This most likely means that we are calling from CLI.
  			// However some cron jobs still need to generate
  			// a web URL, so we use overwritewebroot as a fallback.
  			OC::$WEBROOT = OC_Config::getValue('overwritewebroot', '');

  		}
  
  		// search the 3rdparty folder
  		if (OC_Config::getValue('3rdpartyroot', '') <> '' and OC_Config::getValue('3rdpartyurl', '') <> '') {
  			OC::$THIRDPARTYROOT = OC_Config::getValue('3rdpartyroot', '');
  			OC::$THIRDPARTYWEBROOT = OC_Config::getValue('3rdpartyurl', '');
  		} elseif (file_exists(OC::$SERVERROOT . '/3rdparty')) {
  			OC::$THIRDPARTYROOT = OC::$SERVERROOT;
  			OC::$THIRDPARTYWEBROOT = OC::$WEBROOT;
  		} elseif (file_exists(OC::$SERVERROOT . '/../3rdparty')) {
  			OC::$THIRDPARTYWEBROOT = rtrim(dirname(OC::$WEBROOT), '/');
  			OC::$THIRDPARTYROOT = rtrim(dirname(OC::$SERVERROOT), '/');
  		} else {

  			throw new Exception('3rdparty directory not found! Please put the ownCloud 3rdparty'

  				. ' folder in the ownCloud folder or the folder above.'
  				. ' You can also configure the location in the config.php file.');

  		}
  		// search the apps folder
  		$config_paths = OC_Config::getValue('apps_paths', array());
  		if (!empty($config_paths)) {
  			foreach ($config_paths as $paths) {
  				if (isset($paths['url']) && isset($paths['path'])) {
  					$paths['url'] = rtrim($paths['url'], '/');
  					$paths['path'] = rtrim($paths['path'], '/');
  					OC::$APPSROOTS[] = $paths;
  				}
  			}
  		} elseif (file_exists(OC::$SERVERROOT . '/apps')) {
  			OC::$APPSROOTS[] = array('path' => OC::$SERVERROOT . '/apps', 'url' => '/apps', 'writable' => true);
  		} elseif (file_exists(OC::$SERVERROOT . '/../apps')) {
  			OC::$APPSROOTS[] = array(
  				'path' => rtrim(dirname(OC::$SERVERROOT), '/') . '/apps',
  				'url' => '/apps',
  				'writable' => true
  			);
  		}
  
  		if (empty(OC::$APPSROOTS)) {

  			throw new Exception('apps directory not found! Please put the ownCloud apps folder in the ownCloud folder'

  				. ' or the folder above. You can also configure the location in the config.php file.');

  		}
  		$paths = array();
  		foreach (OC::$APPSROOTS as $path) {
  			$paths[] = $path['path'];
  		}
  
  		// set the right include path
  		set_include_path(

  			OC::$SERVERROOT . '/lib/private' . PATH_SEPARATOR .
  			OC::$SERVERROOT . '/config' . PATH_SEPARATOR .
  			OC::$THIRDPARTYROOT . '/3rdparty' . PATH_SEPARATOR .

  			implode(PATH_SEPARATOR, $paths) . PATH_SEPARATOR .

  			get_include_path() . PATH_SEPARATOR .
  			OC::$SERVERROOT

  		);
  	}
  
  	public static function checkConfig() {

  		$l = OC_L10N::get('lib');
  		if (file_exists(self::$configDir . "/config.php")
  			and !is_writable(self::$configDir . "/config.php")

  		) {

  			if (self::$CLI) {

  				echo $l->t('Cannot write into "config" directory!')."
  ";
  				echo $l->t('This can usually be fixed by giving the webserver write access to the config directory')."
  ";

  				echo "
  ";

  				echo $l->t('See %s', array(\OC_Helper::linkToDocs('admin-dir_permissions')))."
  ";

  				exit;
  			} else {
  				OC_Template::printErrorPage(

  					$l->t('Cannot write into "config" directory!'),
  					$l->t('This can usually be fixed by '
  					. '%sgiving the webserver write access to the config directory%s.',
  					 array('<a href="'.\OC_Helper::linkToDocs('admin-dir_permissions').'" target="_blank">', '</a>'))

  				);
  			}

  		}
  	}
  
  	public static function checkInstalled() {
  		// Redirect to installer if not installed
  		if (!OC_Config::getValue('installed', false) && OC::$SUBURI != '/index.php') {
  			if (!OC::$CLI) {
  				$url = 'http://' . $_SERVER['SERVER_NAME'] . OC::$WEBROOT . '/index.php';
  				header("Location: $url");
  			}
  			exit();
  		}
  	}
  
  	public static function checkSSL() {
  		// redirect to https site if configured
  		if (OC_Config::getValue("forcessl", false)) {
  			header('Strict-Transport-Security: max-age=31536000');
  			ini_set("session.cookie_secure", "on");
  			if (OC_Request::serverProtocol() <> 'https' and !OC::$CLI) {
  				$url = "https://" . OC_Request::serverHost() . OC_Request::requestUri();
  				header("Location: $url");
  				exit();
  			}
  		} else {
  			// Invalidate HSTS headers
  			if (OC_Request::serverProtocol() === 'https') {
  				header('Strict-Transport-Security: max-age=0');
  			}
  		}
  	}
  
  	public static function checkMaintenanceMode() {
  		// Allow ajax update script to execute without being stopped
  		if (OC_Config::getValue('maintenance', false) && OC::$SUBURI != '/core/ajax/update.php') {
  			// send http status 503
  			header('HTTP/1.1 503 Service Temporarily Unavailable');
  			header('Status: 503 Service Temporarily Unavailable');
  			header('Retry-After: 120');
  
  			// render error page

  			$tmpl = new OC_Template('', 'update.user', 'guest');

  			$tmpl->printPage();

  			die();
  		}
  	}
  
  	public static function checkSingleUserMode() {
  		$user = OC_User::getUserSession()->getUser();
  		$group = OC_Group::getManager()->get('admin');
  		if ($user && OC_Config::getValue('singleuser', false) && !$group->inGroup($user)) {
  			// send http status 503
  			header('HTTP/1.1 503 Service Temporarily Unavailable');
  			header('Status: 503 Service Temporarily Unavailable');
  			header('Retry-After: 120');
  
  			// render error page
  			$tmpl = new OC_Template('', 'singleuser.user', 'guest');
  			$tmpl->printPage();
  			die();

  		}
  	}

  	/**
  	 * check if the instance needs to preform an upgrade
  	 *
  	 * @return bool

  	 * @deprecated use \OCP\Util::needUpgrade instead

  	 */
  	public static function needUpgrade() {

  		return \OCP\Util::needUpgrade();

  	}

  	/**
  	 * Checks if the version requires an update and shows
  	 * @param bool $showTemplate Whether an update screen should get shown
  	 * @return bool|void
  	 */

  	public static function checkUpgrade($showTemplate = true) {

  		if (\OCP\Util::needUpgrade()) {

  			if ($showTemplate && !OC_Config::getValue('maintenance', false)) {

  				$version = OC_Util::getVersion();
  				$oldTheme = OC_Config::getValue('theme');

  				OC_Config::setValue('theme', '');

  				OC_Util::addScript('config'); // needed for web root
  				OC_Util::addScript('update');
  				$tmpl = new OC_Template('', 'update.admin', 'guest');
  				$tmpl->assign('version', OC_Util::getVersionString());

  
  				// get third party apps
  				$apps = OC_App::getEnabledApps();
  				$incompatibleApps = array();
  				foreach ($apps as $appId) {
  					$info = OC_App::getAppInfo($appId);
  					if(!OC_App::isAppCompatible($version, $info)) {
  						$incompatibleApps[] = $info;
  					}
  				}
  				$tmpl->assign('appList', $incompatibleApps);
  				$tmpl->assign('productName', 'ownCloud'); // for now
  				$tmpl->assign('oldTheme', $oldTheme);

  				$tmpl->printPage();
  				exit();
  			} else {
  				return true;
  			}
  		}
  		return false;
  	}

  	public static function initTemplateEngine() {
  		// Add the stuff we need always

  		// TODO: read from core/js/core.json

  		OC_Util::addScript("jquery-1.10.0.min");
  		OC_Util::addScript("jquery-migrate-1.2.1.min");

  		OC_Util::addScript("jquery-ui-1.10.0.custom");
  		OC_Util::addScript("jquery-showpassword");

  		OC_Util::addScript("placeholders");

  		OC_Util::addScript("jquery-tipsy");
  		OC_Util::addScript("compatibility");

  		OC_Util::addScript("underscore");

  		OC_Util::addScript("jquery.ocdialog");

  		OC_Util::addScript("oc-dialogs");
  		OC_Util::addScript("js");

  		OC_Util::addScript("octemplate");

  		OC_Util::addScript("eventsource");
  		OC_Util::addScript("config");
  		//OC_Util::addScript( "multiselect" );
  		OC_Util::addScript('search', 'result');

  		OC_Util::addScript("oc-requesttoken");

  		OC_Util::addScript("apps");
  		OC_Util::addScript("snap");

  
  		// avatars
  		if (\OC_Config::getValue('enable_avatars', true) === true) {
  			\OC_Util::addScript('placeholder');
  			\OC_Util::addScript('3rdparty', 'md5/md5.min');
  			\OC_Util::addScript('jquery.avatar');
  			\OC_Util::addScript('avatar');
  		}

  
  		OC_Util::addStyle("styles");

  		OC_Util::addStyle("header");
  		OC_Util::addStyle("mobile");

  		OC_Util::addStyle("icons");

  		OC_Util::addStyle("fonts");

  		OC_Util::addStyle("apps");
  		OC_Util::addStyle("fixes");

  		OC_Util::addStyle("multiselect");
  		OC_Util::addStyle("jquery-ui-1.10.0.custom");
  		OC_Util::addStyle("jquery-tipsy");

  		OC_Util::addStyle("jquery.ocdialog");

  	}
  
  	public static function initSession() {
  		// prevents javascript from accessing php session cookies
  		ini_set('session.cookie_httponly', '1;');

  		// set the cookie path to the ownCloud directory
  		$cookie_path = OC::$WEBROOT ? : '/';
  		ini_set('session.cookie_path', $cookie_path);

  		//set the session object to a dummy session so code relying on the session existing still works
  		self::$session = new \OC\Session\Memory('');

  		// Let the session name be changed in the initSession Hook
  		$sessionName = OC_Util::getInstanceId();

  		try {

  			// Allow session apps to create a custom session object
  			$useCustomSession = false;
  			OC_Hook::emit('OC', 'initSession', array('session' => &self::$session, 'sessionName' => &$sessionName, 'useCustomSession' => &$useCustomSession));
  			if(!$useCustomSession) {
  				// set the session name to the instance id - which is unique
  				self::$session = new \OC\Session\Internal($sessionName);
  			}

  			// if session cant be started break with http 500 error
  		} catch (Exception $e) {
  			//show the user a detailed error page
  			OC_Response::setStatus(OC_Response::STATUS_INTERNAL_SERVER_ERROR);
  			OC_Template::printExceptionErrorPage($e);

  		}
  
  		$sessionLifeTime = self::getSessionLifeTime();
  		// regenerate session id periodically to avoid session fixation

  		if (!self::$session->exists('SID_CREATED')) {
  			self::$session->set('SID_CREATED', time());
  		} else if (time() - self::$session->get('SID_CREATED') > $sessionLifeTime / 2) {

  			session_regenerate_id(true);

  			self::$session->set('SID_CREATED', time());

  		}
  
  		// session timeout

  		if (self::$session->exists('LAST_ACTIVITY') && (time() - self::$session->get('LAST_ACTIVITY') > $sessionLifeTime)) {

  			if (isset($_COOKIE[session_name()])) {

  				setcookie(session_name(), '', time() - 42000, $cookie_path);

  			}
  			session_unset();
  			session_destroy();
  			session_start();
  		}

  
  		self::$session->set('LAST_ACTIVITY', time());

  	}
  
  	/**

  	 * @return string

  	 */
  	private static function getSessionLifeTime() {
  		return OC_Config::getValue('session_lifetime', 60 * 60 * 24);
  	}

  	public static function loadAppClassPaths() {
  		foreach (OC_APP::getEnabledApps() as $app) {
  			$file = OC_App::getAppPath($app) . '/appinfo/classpath.php';
  			if (file_exists($file)) {
  				require_once $file;
  			}
  		}
  	}
  
  
  	public static function init() {
  		// register autoloader

  		require_once __DIR__ . '/autoloader.php';
  		self::$loader = new \OC\Autoloader();
  		self::$loader->registerPrefix('Doctrine\\Common', 'doctrine/common/lib');
  		self::$loader->registerPrefix('Doctrine\\DBAL', 'doctrine/dbal/lib');
  		self::$loader->registerPrefix('Symfony\\Component\\Routing', 'symfony/routing');
  		self::$loader->registerPrefix('Symfony\\Component\\Console', 'symfony/console');

  		self::$loader->registerPrefix('Patchwork', '3rdparty');

  		self::$loader->registerPrefix('Pimple', '3rdparty/Pimple');

  		spl_autoload_register(array(self::$loader, 'load'));

  		// make a dummy session available as early as possible since error pages need it
  		self::$session = new \OC\Session\Memory('');

  		// set some stuff
  		//ob_start();
  		error_reporting(E_ALL | E_STRICT);
  		if (defined('DEBUG') && DEBUG) {
  			ini_set('display_errors', 1);
  		}
  		self::$CLI = (php_sapi_name() == 'cli');
  
  		date_default_timezone_set('UTC');
  		ini_set('arg_separator.output', '&');
  
  		// try to switch magic quotes off.

  		if (get_magic_quotes_gpc() == 1) {

  			ini_set('magic_quotes_runtime', 0);
  		}
  
  		//try to configure php to enable big file uploads.
  		//this doesn´t work always depending on the webserver and php configuration.
  		//Let´s try to overwrite some defaults anyways
  
  		//try to set the maximum execution time to 60min
  		@set_time_limit(3600);
  		@ini_set('max_execution_time', 3600);
  		@ini_set('max_input_time', 3600);
  
  		//try to set the maximum filesize to 10G
  		@ini_set('upload_max_filesize', '10G');
  		@ini_set('post_max_size', '10G');
  		@ini_set('file_uploads', '50');

  		self::handleAuthHeaders();

  
  		self::initPaths();

  		if (OC_Config::getValue('instanceid', false)) {
  			// \OC\Memcache\Cache has a hidden dependency on
  			// OC_Util::getInstanceId() for namespacing. See #5409.
  			try {
  				self::$loader->setMemoryCache(\OC\Memcache\Factory::createLowLatency('Autoloader'));

  			} catch (\Exception $ex) {

  			}
  		}
  		OC_Util::isSetLocaleWorking();

  		// setup 3rdparty autoloader
  		$vendorAutoLoad = OC::$THIRDPARTYROOT . '/3rdparty/autoload.php';
  		if (file_exists($vendorAutoLoad)) {
  			require_once $vendorAutoLoad;
  		}

  		// set debug mode if an xdebug session is active
  		if (!defined('DEBUG') || !DEBUG) {
  			if (isset($_COOKIE['XDEBUG_SESSION'])) {
  				define('DEBUG', true);
  			}
  		}

  		if (!defined('PHPUNIT_RUN')) {

  			OC\Log\ErrorHandler::setLogger(OC_Log::$object);

  			if (defined('DEBUG') and DEBUG) {

  				OC\Log\ErrorHandler::register(true);

  				set_exception_handler(array('OC_Template', 'printExceptionErrorPage'));
  			} else {
  				OC\Log\ErrorHandler::register();

  			}

  		}
  
  		// register the stream wrappers
  		stream_wrapper_register('fakedir', 'OC\Files\Stream\Dir');
  		stream_wrapper_register('static', 'OC\Files\Stream\StaticStream');
  		stream_wrapper_register('close', 'OC\Files\Stream\Close');

  		stream_wrapper_register('quota', 'OC\Files\Stream\Quota');

  		stream_wrapper_register('oc', 'OC\Files\Stream\OC');

  		// setup the basic server
  		self::$server = new \OC\Server();

  		self::initTemplateEngine();

  		OC_App::loadApps(array('session'));

  		if (!self::$CLI) {
  			self::initSession();
  		} else {
  			self::$session = new \OC\Session\Memory('');
  		}

  		self::checkConfig();
  		self::checkInstalled();
  		self::checkSSL();

  		OC_Response::addSecurityHeaders();

  
  		$errors = OC_Util::checkServer();
  		if (count($errors) > 0) {

  			if (self::$CLI) {
  				foreach ($errors as $error) {

  					echo $error['error'] . "
  ";

  					echo $error['hint'] . "
  
  ";
  				}
  			} else {

  				OC_Response::setStatus(OC_Response::STATUS_SERVICE_UNAVAILABLE);

  				OC_Template::printGuestPage('', 'error', array('errors' => $errors));
  			}

  			exit;
  		}
  
  		//try to set the session lifetime
  		$sessionLifeTime = self::getSessionLifeTime();
  		@ini_set('gc_maxlifetime', (string)$sessionLifeTime);
  
  		// User and Groups
  		if (!OC_Config::getValue("installed", false)) {

  			self::$session->set('user_id', '');

  		}
  
  		OC_User::useBackend(new OC_User_Database());
  		OC_Group::useBackend(new OC_Group_Database());

  		//setup extra user backends
  		OC_User::setupBackends();
  
  		self::registerCacheHooks();
  		self::registerFilesystemHooks();

  		self::registerPreviewHooks();

  		self::registerShareHooks();

  		self::registerLogRotate();

  		self::registerLocalAddressBook();

  
  		//make sure temporary files are cleaned up
  		register_shutdown_function(array('OC_Helper', 'cleanTmp'));

  		if (OC_Config::getValue('installed', false) && !self::checkUpgrade(false)) {
  			if (OC_Appconfig::getValue('core', 'backgroundjobs_mode', 'ajax') == 'ajax') {
  				OC_Util::addScript('backgroundjobs');
  			}
  		}
  	}

  	private static function registerLocalAddressBook() {
  		self::$server->getContactsManager()->register(function() {
  			$userManager = \OC::$server->getUserManager();
  			\OC::$server->getContactsManager()->registerAddressBook(
  				new \OC\Contacts\LocalAddressBook($userManager));
  		});
  	}

  	/**
  	 * register hooks for the cache
  	 */
  	public static function registerCacheHooks() {

  		if (OC_Config::getValue('installed', false) && !\OCP\Util::needUpgrade()) { //don't try to do this before we are properly setup

  			\OCP\BackgroundJob::registerJob('OC\Cache\FileGlobalGC');

  			// NOTE: This will be replaced to use OCP
  			$userSession = \OC_User::getUserSession();
  			$userSession->listen('postLogin', '\OC\Cache\File', 'loginListener');
  		}
  	}
  
  	/**
  	 * register hooks for the cache
  	 */
  	public static function registerLogRotate() {

  		if (OC_Config::getValue('installed', false) && OC_Config::getValue('log_rotate_size', false) && !\OCP\Util::needUpgrade()) {

  			//don't try to do this before we are properly setup

  			//use custom logfile path if defined, otherwise use default of owncloud.log in data directory
  			\OCP\BackgroundJob::registerJob('OC\Log\Rotate', OC_Config::getValue('logfile', OC_Config::getValue("datadirectory", OC::$SERVERROOT . '/data') . '/owncloud.log'));

  		}

  	}
  
  	/**
  	 * register hooks for the filesystem
  	 */
  	public static function registerFilesystemHooks() {
  		// Check for blacklisted files

  		OC_Hook::connect('OC_Filesystem', 'write', 'OC\Files\Filesystem', 'isBlacklisted');
  		OC_Hook::connect('OC_Filesystem', 'rename', 'OC\Files\Filesystem', 'isBlacklisted');

  	}
  
  	/**

  	 * register hooks for previews
  	 */
  	public static function registerPreviewHooks() {
  		OC_Hook::connect('OC_Filesystem', 'post_write', 'OC\Preview', 'post_write');

  		OC_Hook::connect('OC_Filesystem', 'delete', 'OC\Preview', 'prepare_delete_files');
  		OC_Hook::connect('\OCP\Versions', 'preDelete', 'OC\Preview', 'prepare_delete');
  		OC_Hook::connect('\OCP\Trashbin', 'preDelete', 'OC\Preview', 'prepare_delete');
  		OC_Hook::connect('OC_Filesystem', 'post_delete', 'OC\Preview', 'post_delete_files');

  		OC_Hook::connect('\OCP\Versions', 'delete', 'OC\Preview', 'post_delete');
  		OC_Hook::connect('\OCP\Trashbin', 'delete', 'OC\Preview', 'post_delete');
  	}
  
  	/**

  	 * register hooks for sharing
  	 */
  	public static function registerShareHooks() {

  		if (\OC_Config::getValue('installed')) {

  			OC_Hook::connect('OC_User', 'post_deleteUser', 'OC\Share\Hooks', 'post_deleteUser');
  			OC_Hook::connect('OC_User', 'post_addToGroup', 'OC\Share\Hooks', 'post_addToGroup');
  			OC_Hook::connect('OC_User', 'post_removeFromGroup', 'OC\Share\Hooks', 'post_removeFromGroup');
  			OC_Hook::connect('OC_User', 'post_deleteGroup', 'OC\Share\Hooks', 'post_deleteGroup');

  		}
  	}
  
  	/**

  	 * Handle the request

  	 */
  	public static function handleRequest() {

  		$l = \OC_L10N::get('lib');

  		// load all the classpaths from the enabled apps so they are available
  		// in the routing files of each app
  		OC::loadAppClassPaths();
  
  		// Check if ownCloud is installed or in maintenance (update) mode
  		if (!OC_Config::getValue('installed', false)) {

  			$controller = new OC\Core\Setup\Controller();
  			$controller->run($_POST);

  			exit();
  		}

  		$host = OC_Request::insecureServerHost();
  		// if the host passed in headers isn't trusted
  		if (!OC::$CLI
  			// overwritehost is always trusted
  			&& OC_Request::getOverwriteHost() === null
  			&& !OC_Request::isTrustedDomain($host)) {
  
  			header('HTTP/1.1 400 Bad Request');
  			header('Status: 400 Bad Request');
  			OC_Template::printErrorPage(

  				$l->t('You are accessing the server from an untrusted domain.'),
  				$l->t('Please contact your administrator. If you are an administrator of this instance, configure the "trusted_domain" setting in config/config.php. An example configuration is provided in config/config.sample.php.')

  			);
  			return;
  		}

  		$request = OC_Request::getPathInfo();

  		if (substr($request, -3) !== '.js') { // we need these files during the upgrade

  			self::checkMaintenanceMode();
  			self::checkUpgrade();
  		}

  		if (!OC_User::isLoggedIn()) {
  			// Test it the user is already authenticated using Apaches AuthType Basic... very usable in combination with LDAP
  			OC::tryBasicAuthLogin();
  		}

  		if (!self::$CLI and (!isset($_GET["logout"]) or ($_GET["logout"] !== 'true'))) {

  			try {

  				if (!OC_Config::getValue('maintenance', false) && !\OCP\Util::needUpgrade()) {
  					OC_App::loadApps(array('authentication'));
  					OC_App::loadApps(array('filesystem', 'logging'));

  					OC_App::loadApps();
  				}

  				self::checkSingleUserMode();

  				OC::$server->getRouter()->match(OC_Request::getRawPathInfo());

  				return;
  			} catch (Symfony\Component\Routing\Exception\ResourceNotFoundException $e) {
  				//header('HTTP/1.0 404 Not Found');
  			} catch (Symfony\Component\Routing\Exception\MethodNotAllowedException $e) {
  				OC_Response::setStatus(405);
  				return;
  			}
  		}

  		// Load minimum set of apps
  		if (!self::checkUpgrade(false)) {
  			// For logged-in users: Load everything
  			if(OC_User::isLoggedIn()) {
  				OC_App::loadApps();
  			} else {
  				// For guests: Load only authentication, filesystem and logging
  				OC_App::loadApps(array('authentication'));
  				OC_App::loadApps(array('filesystem', 'logging'));
  			}

  		}
  
  		// Handle redirect URL for logged in users
  		if (isset($_REQUEST['redirect_url']) && OC_User::isLoggedIn()) {
  			$location = OC_Helper::makeURLAbsolute(urldecode($_REQUEST['redirect_url']));
  
  			// Deny the redirect if the URL contains a @
  			// This prevents unvalidated redirects like ?redirect_url=:user@domain.com

  			if (strpos($location, '@') === false) {

  				header('Location: ' . $location);
  				return;
  			}
  		}
  		// Handle WebDAV
  		if ($_SERVER['REQUEST_METHOD'] == 'PROPFIND') {

  			// not allowed any more to prevent people
  			// mounting this root directly.
  			// Users need to mount remote.php/webdav instead.
  			header('HTTP/1.1 405 Method Not Allowed');
  			header('Status: 405 Method Not Allowed');

  			return;
  		}

  		// Redirect to index if the logout link is accessed without valid session
  		// this is needed to prevent "Token expired" messages while login if a session is expired
  		// @see https://github.com/owncloud/core/pull/8443#issuecomment-42425583
  		if(isset($_GET['logout']) && !OC_User::isLoggedIn()) {
  			header("Location: " . OC::$WEBROOT.(empty(OC::$WEBROOT) ? '/' : ''));
  			return;
  		}
  
  		// Someone is logged in

  		if (OC_User::isLoggedIn()) {
  			OC_App::loadApps();
  			OC_User::setupBackends();
  			if (isset($_GET["logout"]) and ($_GET["logout"])) {

  				OC_JSON::callCheck();

  				if (isset($_COOKIE['oc_token'])) {
  					OC_Preferences::deleteKey(OC_User::getUser(), 'login_token', $_COOKIE['oc_token']);
  				}

  				if (isset($_SERVER['PHP_AUTH_USER'])) {
  					if (isset($_COOKIE['oc_ignore_php_auth_user'])) {
  						// Ignore HTTP Authentication for 5 more mintues.
  						setcookie('oc_ignore_php_auth_user', $_SERVER['PHP_AUTH_USER'], time() + 300, OC::$WEBROOT.(empty(OC::$WEBROOT) ? '/' : ''));
  					} elseif ($_SERVER['PHP_AUTH_USER'] === self::$session->get('loginname')) {
  						// Ignore HTTP Authentication to allow a different user to log in.
  						setcookie('oc_ignore_php_auth_user', $_SERVER['PHP_AUTH_USER'], 0, OC::$WEBROOT.(empty(OC::$WEBROOT) ? '/' : ''));
  					}
  				}

  				OC_User::logout();

  				// redirect to webroot and add slash if webroot is empty
  				header("Location: " . OC::$WEBROOT.(empty(OC::$WEBROOT) ? '/' : ''));

  			} else {

  				// Redirect to default application
  				OC_Util::redirectToDefaultPage();

  			}

  		} else {
  			// Not handled and not logged in
  			self::handleLogin();

  		}

  	}

  	/**
  	 * Load a PHP file belonging to the specified application
  	 * @param array $param The application and file to load
  	 * @return bool Whether the file has been found (will return 404 and false if not)
  	 * @deprecated This function will be removed in ownCloud 8 - use proper routing instead
  	 * @param $param
  	 * @return bool Whether the file has been found (will return 404 and false if not)
  	 */

  	public static function loadAppScriptFile($param) {
  		OC_App::loadApps();
  		$app = $param['app'];
  		$file = $param['file'];
  		$app_path = OC_App::getAppPath($app);

  		$file = $app_path . '/' . $file;
  
  		if (OC_App::isEnabled($app) && $app_path !== false && OC_Helper::issubdirectory($file, $app_path)) {

  			unset($app, $app_path);
  			if (file_exists($file)) {
  				require_once $file;
  				return true;
  			}

  		}

  		header('HTTP/1.0 404 Not Found');

  		return false;
  	}

  	protected static function handleAuthHeaders() {
  		//copy http auth headers for apache+php-fcgid work around
  		if (isset($_SERVER['HTTP_XAUTHORIZATION']) && !isset($_SERVER['HTTP_AUTHORIZATION'])) {
  			$_SERVER['HTTP_AUTHORIZATION'] = $_SERVER['HTTP_XAUTHORIZATION'];
  		}
  
  		// Extract PHP_AUTH_USER/PHP_AUTH_PW from other headers if necessary.
  		$vars = array(
  			'HTTP_AUTHORIZATION', // apache+php-cgi work around
  			'REDIRECT_HTTP_AUTHORIZATION', // apache+php-cgi alternative
  		);
  		foreach ($vars as $var) {
  			if (isset($_SERVER[$var]) && preg_match('/Basic\s+(.*)$/i', $_SERVER[$var], $matches)) {
  				list($name, $password) = explode(':', base64_decode($matches[1]), 2);
  				$_SERVER['PHP_AUTH_USER'] = $name;
  				$_SERVER['PHP_AUTH_PW'] = $password;
  				break;
  			}

  		}
  	}
  
  	protected static function handleLogin() {
  		OC_App::loadApps(array('prelogin'));
  		$error = array();

  
  		// auth possible via apache module?
  		if (OC::tryApacheAuth()) {
  			$error[] = 'apacheauthfailed';

  		} // remember was checked after last login

  		elseif (OC::tryRememberLogin()) {

  			$error[] = 'invalidcookie';

  		} // logon via web form

  		elseif (OC::tryFormLogin()) {

  			$error[] = 'invalidpassword';

  			if ( OC_Config::getValue('log_authfailip', false) ) {
  				OC_Log::write('core', 'Login failed: user \''.$_POST["user"].'\' , wrong password, IP:'.$_SERVER['REMOTE_ADDR'],
  				OC_Log::WARN);

  			} else {

  				OC_Log::write('core', 'Login failed: user \''.$_POST["user"].'\' , wrong password, IP:set log_authfailip=true in conf',
                                  OC_Log::WARN);
  			}

  		}

  		OC_Util::displayLoginPage(array_unique($error));
  	}

  	/**
  	 * Remove outdated and therefore invalid tokens for a user
  	 * @param string $user
  	 */

  	protected static function cleanupLoginTokens($user) {
  		$cutoff = time() - OC_Config::getValue('remember_login_cookie_lifetime', 60 * 60 * 24 * 15);
  		$tokens = OC_Preferences::getKeys($user, 'login_token');
  		foreach ($tokens as $token) {
  			$time = OC_Preferences::getValue($user, 'login_token', $token);
  			if ($time < $cutoff) {
  				OC_Preferences::deleteKey($user, 'login_token', $token);
  			}
  		}
  	}

  	/**
  	 * Try to login a user via HTTP authentication
  	 * @return bool|void
  	 */

  	protected static function tryApacheAuth() {
  		$return = OC_User::handleApacheAuth();
  
  		// if return is true we are logged in -> redirect to the default page
  		if ($return === true) {
  			$_REQUEST['redirect_url'] = \OC_Request::requestUri();
  			OC_Util::redirectToDefaultPage();
  			exit;
  		}
  
  		// in case $return is null apache based auth is not enabled
  		return is_null($return) ? false : true;
  	}

  	/**
  	 * Try to login a user using the remember me cookie.
  	 * @return bool Whether the provided cookie was valid
  	 */

  	protected static function tryRememberLogin() {
  		if (!isset($_COOKIE["oc_remember_login"])
  			|| !isset($_COOKIE["oc_token"])
  			|| !isset($_COOKIE["oc_username"])
  			|| !$_COOKIE["oc_remember_login"]
  			|| !OC_Util::rememberLoginAllowed()
  		) {
  			return false;
  		}

  		if (defined("DEBUG") && DEBUG) {
  			OC_Log::write('core', 'Trying to login from cookie', OC_Log::DEBUG);
  		}

  
  		if(OC_User::userExists($_COOKIE['oc_username'])) {

  			self::cleanupLoginTokens($_COOKIE['oc_username']);

  			// verify whether the supplied "remember me" token was valid
  			$granted = OC_User::loginWithCookie(
  				$_COOKIE['oc_username'], $_COOKIE['oc_token']);
  			if($granted === true) {

  				OC_Util::redirectToDefaultPage();
  				// doesn't return
  			}

  			OC_Log::write('core', 'Authentication cookie rejected for user ' .
  				$_COOKIE['oc_username'], OC_Log::WARN);

  			// if you reach this point you have changed your password
  			// or you are an attacker
  			// we can not delete tokens here because users may reach
  			// this point multiple times after a password change

  		}

  		OC_User::unsetMagicInCookie();
  		return true;
  	}

  	/**
  	 * Tries to login a user using the formbased authentication
  	 * @return bool|void
  	 */

  	protected static function tryFormLogin() {
  		if (!isset($_POST["user"]) || !isset($_POST['password'])) {
  			return false;
  		}

  		OC_JSON::callCheck();

  		OC_App::loadApps();
  
  		//setup extra user backends
  		OC_User::setupBackends();
  
  		if (OC_User::login($_POST["user"], $_POST["password"])) {
  			// setting up the time zone
  			if (isset($_POST['timezone-offset'])) {

  				self::$session->set('timezone', $_POST['timezone-offset']);

  			}
  
  			$userid = OC_User::getUser();
  			self::cleanupLoginTokens($userid);
  			if (!empty($_POST["remember_login"])) {
  				if (defined("DEBUG") && DEBUG) {
  					OC_Log::write('core', 'Setting remember login to cookie', OC_Log::DEBUG);
  				}

  				$token = OC_Util::generateRandomBytes(32);

  				OC_Preferences::setValue($userid, 'login_token', $token, time());
  				OC_User::setMagicInCookie($userid, $token);
  			} else {
  				OC_User::unsetMagicInCookie();
  			}
  			OC_Util::redirectToDefaultPage();
  			exit();
  		}
  		return true;
  	}

  	/**
  	 * Try to login a user using HTTP authentication.
  	 * @return bool
  	 */

  	protected static function tryBasicAuthLogin() {
  		if (!isset($_SERVER["PHP_AUTH_USER"])
  			|| !isset($_SERVER["PHP_AUTH_PW"])

  			|| (isset($_COOKIE['oc_ignore_php_auth_user']) && $_COOKIE['oc_ignore_php_auth_user'] === $_SERVER['PHP_AUTH_USER'])

  		) {
  			return false;
  		}

  		if (OC_User::login($_SERVER["PHP_AUTH_USER"], $_SERVER["PHP_AUTH_PW"])) {
  			//OC_Log::write('core',"Logged in with HTTP Authentication", OC_Log::DEBUG);
  			OC_User::unsetMagicInCookie();
  			$_SERVER['HTTP_REQUESTTOKEN'] = OC_Util::callRegister();
  		}
  		return true;
  	}
  
  }

  if (!function_exists('get_temp_dir')) {

  	/**
  	 * Get the temporary dir to store uploaded data
  	 * @return null|string Path to the temporary directory or null
  	 */

  	function get_temp_dir() {
  		if ($temp = ini_get('upload_tmp_dir')) return $temp;
  		if ($temp = getenv('TMP')) return $temp;
  		if ($temp = getenv('TEMP')) return $temp;
  		if ($temp = getenv('TMPDIR')) return $temp;
  		$temp = tempnam(__FILE__, '');
  		if (file_exists($temp)) {
  			unlink($temp);
  			return dirname($temp);
  		}
  		if ($temp = sys_get_temp_dir()) return $temp;
  
  		return null;
  	}
  }
  
  OC::init();