nextcloud/lib/base.php

<?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
{
    /**
     * Assoziative 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();
    /*
     * requested app
     */
    public static $REQUESTEDAPP = '';
    /*
     * requested file of app
     */
    public static $REQUESTEDFILE = '';
    /**
     * check if owncloud runs in cli mode
     */
    public static $CLI = false;
    /*
     * OC router
     */
    protected static $router = null;

    /**
     * SPL autoload
     */
    public static function autoload($className)
    {
        if (array_key_exists($className, OC::$CLASSPATH)) {
            $path = OC::$CLASSPATH[$className];
            /** @TODO: Remove this when necessary
            Remove "apps/" from inclusion path for smooth migration to mutli app dir
             */
            if (strpos($path, 'apps/') === 0) {
                OC_Log::write('core', 'include path for class "' . $className . '" starts with "apps/"', OC_Log::DEBUG);
                $path = str_replace('apps/', '', $path);
            }
        } elseif (strpos($className, 'OC_') === 0) {
            $path = strtolower(str_replace('_', '/', substr($className, 3)) . '.php');
        } elseif (strpos($className, 'OC\\') === 0) {
            $path = strtolower(str_replace('\\', '/', substr($className, 3)) . '.php');
        } elseif (strpos($className, 'OCP\\') === 0) {
            $path = 'public/' . strtolower(str_replace('\\', '/', substr($className, 3)) . '.php');
        } elseif (strpos($className, 'OCA\\') === 0) {
            $path = 'apps/' . strtolower(str_replace('\\', '/', substr($className, 3)) . '.php');
        } elseif (strpos($className, 'Sabre_') === 0) {
            $path = str_replace('_', '/', $className) . '.php';
        } elseif (strpos($className, 'Symfony\\Component\\Routing\\') === 0) {
            $path = 'symfony/routing/' . str_replace('\\', '/', $className) . '.php';
        } elseif (strpos($className, 'Sabre\\VObject') === 0) {
            $path = str_replace('\\', '/', $className) . '.php';
        } elseif (strpos($className, 'Test_') === 0) {
            $path = 'tests/lib/' . strtolower(str_replace('_', '/', substr($className, 5)) . '.php');
        } else {
            return false;
        }

        if ($fullPath = stream_resolve_include_path($path)) {
            require_once $fullPath;
        }
        return false;
    }

    public static function initPaths()
    {
        // calculate the root directories
        OC::$SERVERROOT = str_replace("\\", '/', substr(__DIR__, 0, -4));
        OC::$SUBURI = str_replace("\\", "/", substr(realpath($_SERVER["SCRIPT_FILENAME"]), strlen(OC::$SERVERROOT)));
        $scriptName = $_SERVER["SCRIPT_NAME"];
        if (substr($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';
            }
        }

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

        if (OC::$WEBROOT != '' and OC::$WEBROOT[0] !== '/') {
            OC::$WEBROOT = '/' . OC::$WEBROOT;
        }

        // ensure we can find OC_Config
        set_include_path(
            OC::$SERVERROOT . '/lib' . PATH_SEPARATOR .
                get_include_path()
        );

        // 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 {
            echo("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.");
            exit;
        }
        // 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)) {
            echo("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.");
            exit;
        }
        $paths = array();
        foreach (OC::$APPSROOTS as $path)
            $paths[] = $path['path'];

        // set the right include path
        set_include_path(
            OC::$SERVERROOT . '/lib' . PATH_SEPARATOR .
                OC::$SERVERROOT . '/config' . PATH_SEPARATOR .
                OC::$THIRDPARTYROOT . '/3rdparty' . PATH_SEPARATOR .
                implode($paths, PATH_SEPARATOR) . PATH_SEPARATOR .
                get_include_path() . PATH_SEPARATOR .
                OC::$SERVERROOT
        );
    }

    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() . $_SERVER['REQUEST_URI'];
                header("Location: $url");
                exit();
            }
        }
    }

    public static function checkUpgrade()
    {
        if (OC_Config::getValue('installed', false)) {
            $installedVersion = OC_Config::getValue('version', '0.0.0');
            $currentVersion = implode('.', OC_Util::getVersion());
            if (version_compare($currentVersion, $installedVersion, '>')) {
                // Check if the .htaccess is existing - this is needed for upgrades from really old ownCloud versions
                if (isset($_SERVER['SERVER_SOFTWARE']) && strstr($_SERVER['SERVER_SOFTWARE'], 'Apache')) {
                    if (!OC_Util::ishtaccessworking()) {
                        if (!file_exists(OC::$SERVERROOT . '/data/.htaccess')) {
                            OC_Setup::protectDataDirectory();
                        }
                    }
                }
                OC_Log::write('core', 'starting upgrade from ' . $installedVersion . ' to ' . $currentVersion, OC_Log::DEBUG);
                $result = OC_DB::updateDbFromStructure(OC::$SERVERROOT . '/db_structure.xml');
                if (!$result) {
                    echo 'Error while upgrading the database';
                    die();
                }
                if (file_exists(OC::$SERVERROOT . "/config/config.php") and !is_writable(OC::$SERVERROOT . "/config/config.php")) {
                    $tmpl = new OC_Template('', 'error', 'guest');
                    $tmpl->assign('errors', array(1 => array('error' => "Can't write into config directory 'config'", 'hint' => "You can usually fix this by giving the webserver user write access to the config directory in owncloud")));
                    $tmpl->printPage();
                    exit;
                }
                $minimizerCSS = new OC_Minimizer_CSS();
                $minimizerCSS->clearCache();
                $minimizerJS = new OC_Minimizer_JS();
                $minimizerJS->clearCache();
                OC_Config::setValue('version', implode('.', OC_Util::getVersion()));
                OC_App::checkAppsRequirements();
                // load all apps to also upgrade enabled apps
                OC_App::loadApps();
            }
        }
    }

    public static function initTemplateEngine()
    {
        // Add the stuff we need always
        OC_Util::addScript("jquery-1.7.2.min");
        OC_Util::addScript("jquery-ui-1.8.16.custom.min");
        OC_Util::addScript("jquery-showpassword");
        OC_Util::addScript("jquery.infieldlabel");
        OC_Util::addScript("jquery-tipsy");
        OC_Util::addScript("oc-dialogs");
        OC_Util::addScript("js");
        OC_Util::addScript("eventsource");
        OC_Util::addScript("config");
        //OC_Util::addScript( "multiselect" );
        OC_Util::addScript('search', 'result');
        OC_Util::addScript('router');

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

        OC_Util::addStyle("styles");
        OC_Util::addStyle("multiselect");
        OC_Util::addStyle("jquery-ui-1.8.16.custom");
        OC_Util::addStyle("jquery-tipsy");
    }

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

        // set the session name to the instance id - which is unique
        session_name(OC_Util::getInstanceId());

        // (re)-initialize session
        session_start();

        // regenerate session id periodically to avoid session fixation
        if (!isset($_SESSION['SID_CREATED'])) {
            $_SESSION['SID_CREATED'] = time();
        } else if (time() - $_SESSION['SID_CREATED'] > 900) {
            session_regenerate_id(true);
            $_SESSION['SID_CREATED'] = time();
        }

        // session timeout
        if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 3600)) {
            if (isset($_COOKIE[session_name()])) {
                setcookie(session_name(), '', time() - 42000, '/');
            }
            session_unset();
            session_destroy();
            session_start();
        }
        $_SESSION['LAST_ACTIVITY'] = time();
    }

    public static function getRouter()
    {
        if (!isset(OC::$router)) {
            OC::$router = new OC_Router();
            OC::$router->loadRoutes();
        }

        return OC::$router;
    }

    public static function init()
    {
        // register autoloader
        spl_autoload_register(array('OC', 'autoload'));
        setlocale(LC_ALL, 'en_US.UTF-8');

        // 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', '&amp;');

        // try to switch magic quotes off.
        if (get_magic_quotes_gpc()) {
            @set_magic_quotes_runtime(false);
        }

        //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');

        //try to set the session lifetime to 60min
        @ini_set('gc_maxlifetime', '3600');

        //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'];
        }

        //set http auth headers for apache+php-cgi work around
        if (isset($_SERVER['HTTP_AUTHORIZATION']) && preg_match('/Basic\s+(.*)$/i', $_SERVER['HTTP_AUTHORIZATION'], $matches)) {
            list($name, $password) = explode(':', base64_decode($matches[1]), 2);
            $_SERVER['PHP_AUTH_USER'] = strip_tags($name);
            $_SERVER['PHP_AUTH_PW'] = strip_tags($password);
        }

        //set http auth headers for apache+php-cgi work around if variable gets renamed by apache
        if (isset($_SERVER['REDIRECT_HTTP_AUTHORIZATION']) && preg_match('/Basic\s+(.*)$/i', $_SERVER['REDIRECT_HTTP_AUTHORIZATION'], $matches)) {
            list($name, $password) = explode(':', base64_decode($matches[1]), 2);
            $_SERVER['PHP_AUTH_USER'] = strip_tags($name);
            $_SERVER['PHP_AUTH_PW'] = strip_tags($password);
        }

        self::initPaths();

        register_shutdown_function(array('OC_Log', 'onShutdown'));
        set_error_handler(array('OC_Log', 'onError'));
        set_exception_handler(array('OC_Log', 'onException'));

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

        // register the stream wrappers
        require_once 'streamwrappers.php';
        stream_wrapper_register("fakedir", "OC_FakeDirStream");
        stream_wrapper_register('static', 'OC_StaticStreamWrapper');
        stream_wrapper_register('close', 'OC_CloseStreamWrapper');

        self::checkInstalled();
        self::checkSSL();
        self::initSession();
        self::initTemplateEngine();
        self::checkUpgrade();

        $errors = OC_Util::checkServer();
        if (count($errors) > 0) {
            OC_Template::printGuestPage('', 'error', array('errors' => $errors));
            exit;
        }

        // User and Groups
        if (!OC_Config::getValue("installed", false)) {
            $_SESSION['user_id'] = '';
        }

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

        if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SESSION['user_id']) && $_SERVER['PHP_AUTH_USER'] != $_SESSION['user_id']) {
            OC_User::logout();
        }

        // Load Apps
        // This includes plugins for users and filesystems as well
        global $RUNTIME_NOAPPS;
        global $RUNTIME_APPTYPES;
        if (!$RUNTIME_NOAPPS) {
            if ($RUNTIME_APPTYPES) {
                OC_App::loadApps($RUNTIME_APPTYPES);
            } else {
                OC_App::loadApps();
            }
        }

        //setup extra user backends
        OC_User::setupBackends();

        self::registerCacheHooks();
        self::registerFilesystemHooks();
        self::registerShareHooks();

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

        //parse the given parameters
        self::$REQUESTEDAPP = (isset($_GET['app']) && trim($_GET['app']) != '' && !is_null($_GET['app']) ? str_replace(array('\0', '/', '\\', '..'), '', strip_tags($_GET['app'])) : OC_Config::getValue('defaultapp', 'files'));
        if (substr_count(self::$REQUESTEDAPP, '?') != 0) {
            $app = substr(self::$REQUESTEDAPP, 0, strpos(self::$REQUESTEDAPP, '?'));
            $param = substr($_GET['app'], strpos($_GET['app'], '?') + 1);
            parse_str($param, $get);
            $_GET = array_merge($_GET, $get);
            self::$REQUESTEDAPP = $app;
            $_GET['app'] = $app;
        }
        self::$REQUESTEDFILE = (isset($_GET['getfile']) ? $_GET['getfile'] : null);
        if (substr_count(self::$REQUESTEDFILE, '?') != 0) {
            $file = substr(self::$REQUESTEDFILE, 0, strpos(self::$REQUESTEDFILE, '?'));
            $param = substr(self::$REQUESTEDFILE, strpos(self::$REQUESTEDFILE, '?') + 1);
            parse_str($param, $get);
            $_GET = array_merge($_GET, $get);
            self::$REQUESTEDFILE = $file;
            $_GET['getfile'] = $file;
        }
        if (!is_null(self::$REQUESTEDFILE)) {
            $subdir = OC_App::getAppPath(OC::$REQUESTEDAPP) . '/' . self::$REQUESTEDFILE;
            $parent = OC_App::getAppPath(OC::$REQUESTEDAPP);
            if (!OC_Helper::issubdirectory($subdir, $parent)) {
                self::$REQUESTEDFILE = null;
                header('HTTP/1.0 404 Not Found');
                exit;
            }
        }

        // write error into log if locale can't be set
        if (OC_Util::issetlocaleworking() == false) {
            OC_Log::write('core', 'setting locate to en_US.UTF-8 failed. Support is probably not installed on your system', OC_Log::ERROR);
        }
    }

    /**
     * register hooks for the cache
     */
    public static function registerCacheHooks()
    {
        // register cache cleanup jobs
        OC_BackgroundJob_RegularTask::register('OC_Cache_FileGlobal', 'gc');
        OC_Hook::connect('OC_User', 'post_login', 'OC_Cache_File', 'loginListener');
    }

    /**
     * register hooks for the filesystem
     */
    public static function registerFilesystemHooks()
    {
        // Check for blacklisted files
        OC_Hook::connect('OC_Filesystem', 'write', 'OC_Filesystem', 'isBlacklisted');
        OC_Hook::connect('OC_Filesystem', 'rename', 'OC_Filesystem', 'isBlacklisted');
    }

    /**
     * register hooks for sharing
     */
    public static function registerShareHooks()
    {
        OC_Hook::connect('OC_User', 'post_deleteUser', 'OCP\Share', 'post_deleteUser');
        OC_Hook::connect('OC_User', 'post_addToGroup', 'OCP\Share', 'post_addToGroup');
        OC_Hook::connect('OC_User', 'post_removeFromGroup', 'OCP\Share', 'post_removeFromGroup');
        OC_Hook::connect('OC_User', 'post_deleteGroup', 'OCP\Share', 'post_deleteGroup');
    }

    /**
     * @brief Handle the request
     */
    public static function handleRequest()
    {
        if (!OC_Config::getValue('installed', false)) {
            require_once 'core/setup.php';
            exit();
        }
        // Handle redirect URL for logged in users
        if (isset($_REQUEST['redirect_url']) && OC_User::isLoggedIn()) {
            $location = OC_Helper::makeURLAbsolute(urldecode($_REQUEST['redirect_url']));
            header('Location: ' . $location);
            return;
        }
        // Handle WebDAV
        if ($_SERVER['REQUEST_METHOD'] == 'PROPFIND') {
            header('location: ' . OC_Helper::linkToRemote('webdav'));
            return;
        }
        try {
            OC::getRouter()->match(OC_Request::getPathInfo());
            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;
        }
        $app = OC::$REQUESTEDAPP;
        $file = OC::$REQUESTEDFILE;
        $param = array('app' => $app, 'file' => $file);
        // Handle app css files
        if (substr($file, -3) == 'css') {
            self::loadCSSFile($param);
            return;
        }
        // Someone is logged in :
        if (OC_User::isLoggedIn()) {
            OC_App::loadApps();
            OC_User::setupBackends();
            if (isset($_GET["logout"]) and ($_GET["logout"])) {
		if (isset($_COOKIE['oc_token'])) {
			OC_Preferences::deleteKey(OC_User::getUser(), 'login_token', $_COOKIE['oc_token']);
		}
                OC_User::logout();
                header("Location: " . OC::$WEBROOT . '/');
            } else {
                if (is_null($file)) {
                    $param['file'] = 'index.php';
                }
                $file_ext = substr($param['file'], -3);
                if ($file_ext != 'php'
                    || !self::loadAppScriptFile($param)
                ) {
                    header('HTTP/1.0 404 Not Found');
                }
            }
            return;
        }
        // Not handled and not logged in
        self::handleLogin();
    }

    public static function loadAppScriptFile($param)
    {
        OC_App::loadApps();
        $app = $param['app'];
        $file = $param['file'];
        $app_path = OC_App::getAppPath($app);
        $file = $app_path . '/' . $file;
        unset($app, $app_path);
        if (file_exists($file)) {
            require_once $file;
            return true;
        }
        return false;
    }

    public static function loadCSSFile($param)
    {
        $app = $param['app'];
        $file = $param['file'];
        $app_path = OC_App::getAppPath($app);
        if (file_exists($app_path . '/' . $file)) {
            $app_web_path = OC_App::getAppWebPath($app);
            $filepath = $app_web_path . '/' . $file;
            $minimizer = new OC_Minimizer_CSS();
            $info = array($app_path, $app_web_path, $file);
            $minimizer->output(array($info), $filepath);
        }
    }

    protected static function handleLogin()
    {
        OC_App::loadApps(array('prelogin'));
        $error = array();
        // remember was checked after last login
        if (OC::tryRememberLogin()) {
            $error[] = 'invalidcookie';

            // Someone wants to log in :
        } elseif (OC::tryFormLogin()) {
            $error[] = 'invalidpassword';

            // The user is already authenticated using Apaches AuthType Basic... very usable in combination with LDAP
        } elseif (OC::tryBasicAuthLogin()) {
            $error[] = 'invalidpassword';
        }
        OC_Util::displayLoginPage(array_unique($error));
    }

    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);
            }
        }
    }

    protected static function tryRememberLogin()
    {
        if (!isset($_COOKIE["oc_remember_login"])
            || !isset($_COOKIE["oc_token"])
            || !isset($_COOKIE["oc_username"])
            || !$_COOKIE["oc_remember_login"]
        ) {
            return false;
        }
        OC_App::loadApps(array('authentication'));
        if (defined("DEBUG") && DEBUG) {
            OC_Log::write('core', 'Trying to login from cookie', OC_Log::DEBUG);
        }
        // confirm credentials in cookie
        if (isset($_COOKIE['oc_token']) && OC_User::userExists($_COOKIE['oc_username'])) {
            // delete outdated cookies
            self::cleanupLoginTokens($_COOKIE['oc_username']);
            // get stored tokens
            $tokens = OC_Preferences::getKeys($_COOKIE['oc_username'], 'login_token');
            // test cookies token against stored tokens
            if (in_array($_COOKIE['oc_token'], $tokens, true)) {
                // replace successfully used token with a new one
                OC_Preferences::deleteKey($_COOKIE['oc_username'], 'login_token', $_COOKIE['oc_token']);
                $token = OC_Util::generate_random_bytes(32);
                OC_Preferences::setValue($_COOKIE['oc_username'], 'login_token', $token, time());
                OC_User::setMagicInCookie($_COOKIE['oc_username'], $token);
                // login
                OC_User::setUserId($_COOKIE['oc_username']);
                OC_Util::redirectToDefaultPage();
                // doesn't return
            }
            // 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_Log::write('core', 'Authentication cookie rejected for user ' . $_COOKIE['oc_username'], OC_Log::WARN);
        }
        OC_User::unsetMagicInCookie();
        return true;
    }

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

        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'])) {
                $_SESSION['timezone'] = $_POST['timezone-offset'];
            }

            self::cleanupLoginTokens($_POST['user']);
            if (!empty($_POST["remember_login"])) {
                if (defined("DEBUG") && DEBUG) {
                    OC_Log::write('core', 'Setting remember login to cookie', OC_Log::DEBUG);
                }
                $token = OC_Util::generate_random_bytes(32);
                OC_Preferences::setValue($_POST['user'], 'login_token', $token, time());
                OC_User::setMagicInCookie($_POST["user"], $token);
            } else {
                OC_User::unsetMagicInCookie();
            }
            OC_Util::redirectToDefaultPage();
            exit();
        }
        return true;
    }

    protected static function tryBasicAuthLogin()
    {
        if (!isset($_SERVER["PHP_AUTH_USER"])
            || !isset($_SERVER["PHP_AUTH_PW"])
        ) {
            return false;
        }
        OC_App::loadApps(array('authentication'));
        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();
            $_REQUEST['redirect_url'] = (isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '');
            OC_Util::redirectToDefaultPage();
        }
        return true;
    }

}

// define runtime variables - unless this already has been done
if (!isset($RUNTIME_NOAPPS)) {
    $RUNTIME_NOAPPS = false;
}

if (!function_exists('get_temp_dir')) {
    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();