nextcloud / server

lib/private/legacy/util.php

Indentation +1392 added lines, -1392 removed lines

@@ -69,1402 +69,1402 @@
 use OCP\IUser;
 
 class OC_Util {
-	public static $scripts = [];
-	public static $styles = [];
-	public static $headers = [];
-	private static $rootMounted = false;
-	private static $fsSetup = false;
-
-	/** @var array Local cache of version.php */
-	private static $versionCache = null;
-
-	protected static function getAppManager() {
-		return \OC::$server->getAppManager();
-	}
-
-	private static function initLocalStorageRootFS() {
-		// mount local file backend as root
-		$configDataDirectory = \OC::$server->getSystemConfig()->getValue("datadirectory", OC::$SERVERROOT . "/data");
-		//first set up the local "root" storage
-		\OC\Files\Filesystem::initMountManager();
-		if (!self::$rootMounted) {
-			\OC\Files\Filesystem::mount('\OC\Files\Storage\Local', ['datadir' => $configDataDirectory], '/');
-			self::$rootMounted = true;
-		}
-	}
-
-	/**
-	 * mounting an object storage as the root fs will in essence remove the
-	 * necessity of a data folder being present.
-	 * TODO make home storage aware of this and use the object storage instead of local disk access
-	 *
-	 * @param array $config containing 'class' and optional 'arguments'
-	 * @suppress PhanDeprecatedFunction
-	 */
-	private static function initObjectStoreRootFS($config) {
-		// check misconfiguration
-		if (empty($config['class'])) {
-			\OCP\Util::writeLog('files', 'No class given for objectstore', ILogger::ERROR);
-		}
-		if (!isset($config['arguments'])) {
-			$config['arguments'] = [];
-		}
-
-		// instantiate object store implementation
-		$name = $config['class'];
-		if (strpos($name, 'OCA\\') === 0 && substr_count($name, '\\') >= 2) {
-			$segments = explode('\\', $name);
-			OC_App::loadApp(strtolower($segments[1]));
-		}
-		$config['arguments']['objectstore'] = new $config['class']($config['arguments']);
-		// mount with plain / root object store implementation
-		$config['class'] = '\OC\Files\ObjectStore\ObjectStoreStorage';
-
-		// mount object storage as root
-		\OC\Files\Filesystem::initMountManager();
-		if (!self::$rootMounted) {
-			\OC\Files\Filesystem::mount($config['class'], $config['arguments'], '/');
-			self::$rootMounted = true;
-		}
-	}
-
-	/**
-	 * mounting an object storage as the root fs will in essence remove the
-	 * necessity of a data folder being present.
-	 *
-	 * @param array $config containing 'class' and optional 'arguments'
-	 * @suppress PhanDeprecatedFunction
-	 */
-	private static function initObjectStoreMultibucketRootFS($config) {
-		// check misconfiguration
-		if (empty($config['class'])) {
-			\OCP\Util::writeLog('files', 'No class given for objectstore', ILogger::ERROR);
-		}
-		if (!isset($config['arguments'])) {
-			$config['arguments'] = [];
-		}
-
-		// instantiate object store implementation
-		$name = $config['class'];
-		if (strpos($name, 'OCA\\') === 0 && substr_count($name, '\\') >= 2) {
-			$segments = explode('\\', $name);
-			OC_App::loadApp(strtolower($segments[1]));
-		}
-
-		if (!isset($config['arguments']['bucket'])) {
-			$config['arguments']['bucket'] = '';
-		}
-		// put the root FS always in first bucket for multibucket configuration
-		$config['arguments']['bucket'] .= '0';
-
-		$config['arguments']['objectstore'] = new $config['class']($config['arguments']);
-		// mount with plain / root object store implementation
-		$config['class'] = '\OC\Files\ObjectStore\ObjectStoreStorage';
-
-		// mount object storage as root
-		\OC\Files\Filesystem::initMountManager();
-		if (!self::$rootMounted) {
-			\OC\Files\Filesystem::mount($config['class'], $config['arguments'], '/');
-			self::$rootMounted = true;
-		}
-	}
-
-	/**
-	 * Can be set up
-	 *
-	 * @param string $user
-	 * @return boolean
-	 * @description configure the initial filesystem based on the configuration
-	 * @suppress PhanDeprecatedFunction
-	 * @suppress PhanAccessMethodInternal
-	 */
-	public static function setupFS($user = '') {
-		//setting up the filesystem twice can only lead to trouble
-		if (self::$fsSetup) {
-			return false;
-		}
-
-		\OC::$server->getEventLogger()->start('setup_fs', 'Setup filesystem');
-
-		// If we are not forced to load a specific user we load the one that is logged in
-		if ($user === null) {
-			$user = '';
-		} else if ($user == "" && \OC::$server->getUserSession()->isLoggedIn()) {
-			$user = OC_User::getUser();
-		}
-
-		// load all filesystem apps before, so no setup-hook gets lost
-		OC_App::loadApps(['filesystem']);
-
-		// the filesystem will finish when $user is not empty,
-		// mark fs setup here to avoid doing the setup from loading
-		// OC_Filesystem
-		if ($user != '') {
-			self::$fsSetup = true;
-		}
-
-		\OC\Files\Filesystem::initMountManager();
-
-		$prevLogging = \OC\Files\Filesystem::logWarningWhenAddingStorageWrapper(false);
-		\OC\Files\Filesystem::addStorageWrapper('mount_options', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if ($storage->instanceOfStorage('\OC\Files\Storage\Common')) {
-				/** @var \OC\Files\Storage\Common $storage */
-				$storage->setMountOptions($mount->getOptions());
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('enable_sharing', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if (!$mount->getOption('enable_sharing', true)) {
-				return new \OC\Files\Storage\Wrapper\PermissionsMask([
-					'storage' => $storage,
-					'mask' => \OCP\Constants::PERMISSION_ALL - \OCP\Constants::PERMISSION_SHARE
-				]);
-			}
-			return $storage;
-		});
-
-		// install storage availability wrapper, before most other wrappers
-		\OC\Files\Filesystem::addStorageWrapper('oc_availability', function ($mountPoint, \OCP\Files\Storage\IStorage $storage) {
-			if (!$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
-				return new \OC\Files\Storage\Wrapper\Availability(['storage' => $storage]);
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('oc_encoding', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if ($mount->getOption('encoding_compatibility', false) && !$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
-				return new \OC\Files\Storage\Wrapper\Encoding(['storage' => $storage]);
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('oc_quota', function ($mountPoint, $storage) {
-			// set up quota for home storages, even for other users
-			// which can happen when using sharing
-
-			/**
-			 * @var \OC\Files\Storage\Storage $storage
-			 */
-			if ($storage->instanceOfStorage('\OC\Files\Storage\Home')
-				|| $storage->instanceOfStorage('\OC\Files\ObjectStore\HomeObjectStoreStorage')
-			) {
-				/** @var \OC\Files\Storage\Home $storage */
-				if (is_object($storage->getUser())) {
-					$quota = OC_Util::getUserQuota($storage->getUser());
-					if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
-						return new \OC\Files\Storage\Wrapper\Quota(['storage' => $storage, 'quota' => $quota, 'root' => 'files']);
-					}
-				}
-			}
-
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('readonly', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			/*
+    public static $scripts = [];
+    public static $styles = [];
+    public static $headers = [];
+    private static $rootMounted = false;
+    private static $fsSetup = false;
+
+    /** @var array Local cache of version.php */
+    private static $versionCache = null;
+
+    protected static function getAppManager() {
+        return \OC::$server->getAppManager();
+    }
+
+    private static function initLocalStorageRootFS() {
+        // mount local file backend as root
+        $configDataDirectory = \OC::$server->getSystemConfig()->getValue("datadirectory", OC::$SERVERROOT . "/data");
+        //first set up the local "root" storage
+        \OC\Files\Filesystem::initMountManager();
+        if (!self::$rootMounted) {
+            \OC\Files\Filesystem::mount('\OC\Files\Storage\Local', ['datadir' => $configDataDirectory], '/');
+            self::$rootMounted = true;
+        }
+    }
+
+    /**
+     * mounting an object storage as the root fs will in essence remove the
+     * necessity of a data folder being present.
+     * TODO make home storage aware of this and use the object storage instead of local disk access
+     *
+     * @param array $config containing 'class' and optional 'arguments'
+     * @suppress PhanDeprecatedFunction
+     */
+    private static function initObjectStoreRootFS($config) {
+        // check misconfiguration
+        if (empty($config['class'])) {
+            \OCP\Util::writeLog('files', 'No class given for objectstore', ILogger::ERROR);
+        }
+        if (!isset($config['arguments'])) {
+            $config['arguments'] = [];
+        }
+
+        // instantiate object store implementation
+        $name = $config['class'];
+        if (strpos($name, 'OCA\\') === 0 && substr_count($name, '\\') >= 2) {
+            $segments = explode('\\', $name);
+            OC_App::loadApp(strtolower($segments[1]));
+        }
+        $config['arguments']['objectstore'] = new $config['class']($config['arguments']);
+        // mount with plain / root object store implementation
+        $config['class'] = '\OC\Files\ObjectStore\ObjectStoreStorage';
+
+        // mount object storage as root
+        \OC\Files\Filesystem::initMountManager();
+        if (!self::$rootMounted) {
+            \OC\Files\Filesystem::mount($config['class'], $config['arguments'], '/');
+            self::$rootMounted = true;
+        }
+    }
+
+    /**
+     * mounting an object storage as the root fs will in essence remove the
+     * necessity of a data folder being present.
+     *
+     * @param array $config containing 'class' and optional 'arguments'
+     * @suppress PhanDeprecatedFunction
+     */
+    private static function initObjectStoreMultibucketRootFS($config) {
+        // check misconfiguration
+        if (empty($config['class'])) {
+            \OCP\Util::writeLog('files', 'No class given for objectstore', ILogger::ERROR);
+        }
+        if (!isset($config['arguments'])) {
+            $config['arguments'] = [];
+        }
+
+        // instantiate object store implementation
+        $name = $config['class'];
+        if (strpos($name, 'OCA\\') === 0 && substr_count($name, '\\') >= 2) {
+            $segments = explode('\\', $name);
+            OC_App::loadApp(strtolower($segments[1]));
+        }
+
+        if (!isset($config['arguments']['bucket'])) {
+            $config['arguments']['bucket'] = '';
+        }
+        // put the root FS always in first bucket for multibucket configuration
+        $config['arguments']['bucket'] .= '0';
+
+        $config['arguments']['objectstore'] = new $config['class']($config['arguments']);
+        // mount with plain / root object store implementation
+        $config['class'] = '\OC\Files\ObjectStore\ObjectStoreStorage';
+
+        // mount object storage as root
+        \OC\Files\Filesystem::initMountManager();
+        if (!self::$rootMounted) {
+            \OC\Files\Filesystem::mount($config['class'], $config['arguments'], '/');
+            self::$rootMounted = true;
+        }
+    }
+
+    /**
+     * Can be set up
+     *
+     * @param string $user
+     * @return boolean
+     * @description configure the initial filesystem based on the configuration
+     * @suppress PhanDeprecatedFunction
+     * @suppress PhanAccessMethodInternal
+     */
+    public static function setupFS($user = '') {
+        //setting up the filesystem twice can only lead to trouble
+        if (self::$fsSetup) {
+            return false;
+        }
+
+        \OC::$server->getEventLogger()->start('setup_fs', 'Setup filesystem');
+
+        // If we are not forced to load a specific user we load the one that is logged in
+        if ($user === null) {
+            $user = '';
+        } else if ($user == "" && \OC::$server->getUserSession()->isLoggedIn()) {
+            $user = OC_User::getUser();
+        }
+
+        // load all filesystem apps before, so no setup-hook gets lost
+        OC_App::loadApps(['filesystem']);
+
+        // the filesystem will finish when $user is not empty,
+        // mark fs setup here to avoid doing the setup from loading
+        // OC_Filesystem
+        if ($user != '') {
+            self::$fsSetup = true;
+        }
+
+        \OC\Files\Filesystem::initMountManager();
+
+        $prevLogging = \OC\Files\Filesystem::logWarningWhenAddingStorageWrapper(false);
+        \OC\Files\Filesystem::addStorageWrapper('mount_options', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
+            if ($storage->instanceOfStorage('\OC\Files\Storage\Common')) {
+                /** @var \OC\Files\Storage\Common $storage */
+                $storage->setMountOptions($mount->getOptions());
+            }
+            return $storage;
+        });
+
+        \OC\Files\Filesystem::addStorageWrapper('enable_sharing', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
+            if (!$mount->getOption('enable_sharing', true)) {
+                return new \OC\Files\Storage\Wrapper\PermissionsMask([
+                    'storage' => $storage,
+                    'mask' => \OCP\Constants::PERMISSION_ALL - \OCP\Constants::PERMISSION_SHARE
+                ]);
+            }
+            return $storage;
+        });
+
+        // install storage availability wrapper, before most other wrappers
+        \OC\Files\Filesystem::addStorageWrapper('oc_availability', function ($mountPoint, \OCP\Files\Storage\IStorage $storage) {
+            if (!$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
+                return new \OC\Files\Storage\Wrapper\Availability(['storage' => $storage]);
+            }
+            return $storage;
+        });
+
+        \OC\Files\Filesystem::addStorageWrapper('oc_encoding', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
+            if ($mount->getOption('encoding_compatibility', false) && !$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
+                return new \OC\Files\Storage\Wrapper\Encoding(['storage' => $storage]);
+            }
+            return $storage;
+        });
+
+        \OC\Files\Filesystem::addStorageWrapper('oc_quota', function ($mountPoint, $storage) {
+            // set up quota for home storages, even for other users
+            // which can happen when using sharing
+
+            /**
+             * @var \OC\Files\Storage\Storage $storage
+             */
+            if ($storage->instanceOfStorage('\OC\Files\Storage\Home')
+                || $storage->instanceOfStorage('\OC\Files\ObjectStore\HomeObjectStoreStorage')
+            ) {
+                /** @var \OC\Files\Storage\Home $storage */
+                if (is_object($storage->getUser())) {
+                    $quota = OC_Util::getUserQuota($storage->getUser());
+                    if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
+                        return new \OC\Files\Storage\Wrapper\Quota(['storage' => $storage, 'quota' => $quota, 'root' => 'files']);
+                    }
+                }
+            }
+
+            return $storage;
+        });
+
+        \OC\Files\Filesystem::addStorageWrapper('readonly', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
+            /*
 			 * Do not allow any operations that modify the storage
 			 */
-			if ($mount->getOption('readonly', false)) {
-				return new \OC\Files\Storage\Wrapper\PermissionsMask([
-					'storage' => $storage,
-					'mask' => \OCP\Constants::PERMISSION_ALL & ~(
-						\OCP\Constants::PERMISSION_UPDATE |
-						\OCP\Constants::PERMISSION_CREATE |
-						\OCP\Constants::PERMISSION_DELETE
-					),
-				]);
-			}
-			return $storage;
-		});
-
-		OC_Hook::emit('OC_Filesystem', 'preSetup', ['user' => $user]);
-
-		\OC\Files\Filesystem::logWarningWhenAddingStorageWrapper($prevLogging);
-
-		//check if we are using an object storage
-		$objectStore = \OC::$server->getSystemConfig()->getValue('objectstore', null);
-		$objectStoreMultibucket = \OC::$server->getSystemConfig()->getValue('objectstore_multibucket', null);
-
-		// use the same order as in ObjectHomeMountProvider
-		if (isset($objectStoreMultibucket)) {
-			self::initObjectStoreMultibucketRootFS($objectStoreMultibucket);
-		} elseif (isset($objectStore)) {
-			self::initObjectStoreRootFS($objectStore);
-		} else {
-			self::initLocalStorageRootFS();
-		}
-
-		if ($user != '' && !\OC::$server->getUserManager()->userExists($user)) {
-			\OC::$server->getEventLogger()->end('setup_fs');
-			return false;
-		}
-
-		//if we aren't logged in, there is no use to set up the filesystem
-		if ($user != "") {
-
-			$userDir = '/' . $user . '/files';
-
-			//jail the user into his "home" directory
-			\OC\Files\Filesystem::init($user, $userDir);
-
-			OC_Hook::emit('OC_Filesystem', 'setup', ['user' => $user, 'user_dir' => $userDir]);
-		}
-		\OC::$server->getEventLogger()->end('setup_fs');
-		return true;
-	}
-
-	/**
-	 * check if a password is required for each public link
-	 *
-	 * @return boolean
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function isPublicLinkPasswordRequired() {
-		$enforcePassword = \OC::$server->getConfig()->getAppValue('core', 'shareapi_enforce_links_password', 'no');
-		return $enforcePassword === 'yes';
-	}
-
-	/**
-	 * check if sharing is disabled for the current user
-	 * @param IConfig $config
-	 * @param IGroupManager $groupManager
-	 * @param IUser|null $user
-	 * @return bool
-	 */
-	public static function isSharingDisabledForUser(IConfig $config, IGroupManager $groupManager, $user) {
-		if ($config->getAppValue('core', 'shareapi_exclude_groups', 'no') === 'yes') {
-			$groupsList = $config->getAppValue('core', 'shareapi_exclude_groups_list', '');
-			$excludedGroups = json_decode($groupsList);
-			if (is_null($excludedGroups)) {
-				$excludedGroups = explode(',', $groupsList);
-				$newValue = json_encode($excludedGroups);
-				$config->setAppValue('core', 'shareapi_exclude_groups_list', $newValue);
-			}
-			$usersGroups = $groupManager->getUserGroupIds($user);
-			if (!empty($usersGroups)) {
-				$remainingGroups = array_diff($usersGroups, $excludedGroups);
-				// if the user is only in groups which are disabled for sharing then
-				// sharing is also disabled for the user
-				if (empty($remainingGroups)) {
-					return true;
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * check if share API enforces a default expire date
-	 *
-	 * @return boolean
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function isDefaultExpireDateEnforced() {
-		$isDefaultExpireDateEnabled = \OC::$server->getConfig()->getAppValue('core', 'shareapi_default_expire_date', 'no');
-		$enforceDefaultExpireDate = false;
-		if ($isDefaultExpireDateEnabled === 'yes') {
-			$value = \OC::$server->getConfig()->getAppValue('core', 'shareapi_enforce_expire_date', 'no');
-			$enforceDefaultExpireDate = $value === 'yes';
-		}
-
-		return $enforceDefaultExpireDate;
-	}
-
-	/**
-	 * Get the quota of a user
-	 *
-	 * @param IUser|null $user
-	 * @return float Quota bytes
-	 */
-	public static function getUserQuota(?IUser $user) {
-		if (is_null($user)) {
-			return \OCP\Files\FileInfo::SPACE_UNLIMITED;
-		}
-		$userQuota = $user->getQuota();
-		if($userQuota === 'none') {
-			return \OCP\Files\FileInfo::SPACE_UNLIMITED;
-		}
-		return OC_Helper::computerFileSize($userQuota);
-	}
-
-	/**
-	 * copies the skeleton to the users /files
-	 *
-	 * @param string $userId
-	 * @param \OCP\Files\Folder $userDirectory
-	 * @throws \OCP\Files\NotFoundException
-	 * @throws \OCP\Files\NotPermittedException
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function copySkeleton($userId, \OCP\Files\Folder $userDirectory) {
-
-		$plainSkeletonDirectory = \OC::$server->getConfig()->getSystemValue('skeletondirectory', \OC::$SERVERROOT . '/core/skeleton');
-		$userLang = \OC::$server->getL10NFactory()->findLanguage();
-		$skeletonDirectory = str_replace('{lang}', $userLang, $plainSkeletonDirectory);
-
-		if (!file_exists($skeletonDirectory)) {
-			$dialectStart = strpos($userLang, '_');
-			if ($dialectStart !== false) {
-				$skeletonDirectory = str_replace('{lang}', substr($userLang, 0, $dialectStart), $plainSkeletonDirectory);
-			}
-			if ($dialectStart === false || !file_exists($skeletonDirectory)) {
-				$skeletonDirectory = str_replace('{lang}', 'default', $plainSkeletonDirectory);
-			}
-			if (!file_exists($skeletonDirectory)) {
-				$skeletonDirectory = '';
-			}
-		}
-
-		$instanceId = \OC::$server->getConfig()->getSystemValue('instanceid', '');
-
-		if ($instanceId === null) {
-			throw new \RuntimeException('no instance id!');
-		}
-		$appdata = 'appdata_' . $instanceId;
-		if ($userId === $appdata) {
-			throw new \RuntimeException('username is reserved name: ' . $appdata);
-		}
-
-		if (!empty($skeletonDirectory)) {
-			\OCP\Util::writeLog(
-				'files_skeleton',
-				'copying skeleton for '.$userId.' from '.$skeletonDirectory.' to '.$userDirectory->getFullPath('/'),
-				ILogger::DEBUG
-			);
-			self::copyr($skeletonDirectory, $userDirectory);
-			// update the file cache
-			$userDirectory->getStorage()->getScanner()->scan('', \OC\Files\Cache\Scanner::SCAN_RECURSIVE);
-		}
-	}
-
-	/**
-	 * copies a directory recursively by using streams
-	 *
-	 * @param string $source
-	 * @param \OCP\Files\Folder $target
-	 * @return void
-	 */
-	public static function copyr($source, \OCP\Files\Folder $target) {
-		$logger = \OC::$server->getLogger();
-
-		// Verify if folder exists
-		$dir = opendir($source);
-		if($dir === false) {
-			$logger->error(sprintf('Could not opendir "%s"', $source), ['app' => 'core']);
-			return;
-		}
-
-		// Copy the files
-		while (false !== ($file = readdir($dir))) {
-			if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
-				if (is_dir($source . '/' . $file)) {
-					$child = $target->newFolder($file);
-					self::copyr($source . '/' . $file, $child);
-				} else {
-					$child = $target->newFile($file);
-					$sourceStream = fopen($source . '/' . $file, 'r');
-					if($sourceStream === false) {
-						$logger->error(sprintf('Could not fopen "%s"', $source . '/' . $file), ['app' => 'core']);
-						closedir($dir);
-						return;
-					}
-					stream_copy_to_stream($sourceStream, $child->fopen('w'));
-				}
-			}
-		}
-		closedir($dir);
-	}
-
-	/**
-	 * @return void
-	 * @suppress PhanUndeclaredMethod
-	 */
-	public static function tearDownFS() {
-		\OC\Files\Filesystem::tearDown();
-		\OC::$server->getRootFolder()->clearCache();
-		self::$fsSetup = false;
-		self::$rootMounted = false;
-	}
-
-	/**
-	 * get the current installed version of ownCloud
-	 *
-	 * @return array
-	 */
-	public static function getVersion() {
-		OC_Util::loadVersion();
-		return self::$versionCache['OC_Version'];
-	}
-
-	/**
-	 * get the current installed version string of ownCloud
-	 *
-	 * @return string
-	 */
-	public static function getVersionString() {
-		OC_Util::loadVersion();
-		return self::$versionCache['OC_VersionString'];
-	}
-
-	/**
-	 * @deprecated the value is of no use anymore
-	 * @return string
-	 */
-	public static function getEditionString() {
-		return '';
-	}
-
-	/**
-	 * @description get the update channel of the current installed of ownCloud.
-	 * @return string
-	 */
-	public static function getChannel() {
-		OC_Util::loadVersion();
-		return \OC::$server->getConfig()->getSystemValue('updater.release.channel', self::$versionCache['OC_Channel']);
-	}
-
-	/**
-	 * @description get the build number of the current installed of ownCloud.
-	 * @return string
-	 */
-	public static function getBuild() {
-		OC_Util::loadVersion();
-		return self::$versionCache['OC_Build'];
-	}
-
-	/**
-	 * @description load the version.php into the session as cache
-	 * @suppress PhanUndeclaredVariable
-	 */
-	private static function loadVersion() {
-		if (self::$versionCache !== null) {
-			return;
-		}
-
-		$timestamp = filemtime(OC::$SERVERROOT . '/version.php');
-		require OC::$SERVERROOT . '/version.php';
-		/** @var $timestamp int */
-		self::$versionCache['OC_Version_Timestamp'] = $timestamp;
-		/** @var $OC_Version string */
-		self::$versionCache['OC_Version'] = $OC_Version;
-		/** @var $OC_VersionString string */
-		self::$versionCache['OC_VersionString'] = $OC_VersionString;
-		/** @var $OC_Build string */
-		self::$versionCache['OC_Build'] = $OC_Build;
-
-		/** @var $OC_Channel string */
-		self::$versionCache['OC_Channel'] = $OC_Channel;
-	}
-
-	/**
-	 * generates a path for JS/CSS files. If no application is provided it will create the path for core.
-	 *
-	 * @param string $application application to get the files from
-	 * @param string $directory directory within this application (css, js, vendor, etc)
-	 * @param string $file the file inside of the above folder
-	 * @return string the path
-	 */
-	private static function generatePath($application, $directory, $file) {
-		if (is_null($file)) {
-			$file = $application;
-			$application = "";
-		}
-		if (!empty($application)) {
-			return "$application/$directory/$file";
-		} else {
-			return "$directory/$file";
-		}
-	}
-
-	/**
-	 * add a javascript file
-	 *
-	 * @param string $application application id
-	 * @param string|null $file filename
-	 * @param bool $prepend prepend the Script to the beginning of the list
-	 * @return void
-	 */
-	public static function addScript($application, $file = null, $prepend = false) {
-		$path = OC_Util::generatePath($application, 'js', $file);
-
-		// core js files need separate handling
-		if ($application !== 'core' && $file !== null) {
-			self::addTranslations ( $application );
-		}
-		self::addExternalResource($application, $prepend, $path, "script");
-	}
-
-	/**
-	 * add a javascript file from the vendor sub folder
-	 *
-	 * @param string $application application id
-	 * @param string|null $file filename
-	 * @param bool $prepend prepend the Script to the beginning of the list
-	 * @return void
-	 */
-	public static function addVendorScript($application, $file = null, $prepend = false) {
-		$path = OC_Util::generatePath($application, 'vendor', $file);
-		self::addExternalResource($application, $prepend, $path, "script");
-	}
-
-	/**
-	 * add a translation JS file
-	 *
-	 * @param string $application application id
-	 * @param string|null $languageCode language code, defaults to the current language
-	 * @param bool|null $prepend prepend the Script to the beginning of the list
-	 */
-	public static function addTranslations($application, $languageCode = null, $prepend = false) {
-		if (is_null($languageCode)) {
-			$languageCode = \OC::$server->getL10NFactory()->findLanguage($application);
-		}
-		if (!empty($application)) {
-			$path = "$application/l10n/$languageCode";
-		} else {
-			$path = "l10n/$languageCode";
-		}
-		self::addExternalResource($application, $prepend, $path, "script");
-	}
-
-	/**
-	 * add a css file
-	 *
-	 * @param string $application application id
-	 * @param string|null $file filename
-	 * @param bool $prepend prepend the Style to the beginning of the list
-	 * @return void
-	 */
-	public static function addStyle($application, $file = null, $prepend = false) {
-		$path = OC_Util::generatePath($application, 'css', $file);
-		self::addExternalResource($application, $prepend, $path, "style");
-	}
-
-	/**
-	 * add a css file from the vendor sub folder
-	 *
-	 * @param string $application application id
-	 * @param string|null $file filename
-	 * @param bool $prepend prepend the Style to the beginning of the list
-	 * @return void
-	 */
-	public static function addVendorStyle($application, $file = null, $prepend = false) {
-		$path = OC_Util::generatePath($application, 'vendor', $file);
-		self::addExternalResource($application, $prepend, $path, "style");
-	}
-
-	/**
-	 * add an external resource css/js file
-	 *
-	 * @param string $application application id
-	 * @param bool $prepend prepend the file to the beginning of the list
-	 * @param string $path
-	 * @param string $type (script or style)
-	 * @return void
-	 */
-	private static function addExternalResource($application, $prepend, $path, $type = "script") {
-
-		if ($type === "style") {
-			if (!in_array($path, self::$styles)) {
-				if ($prepend === true) {
-					array_unshift ( self::$styles, $path );
-				} else {
-					self::$styles[] = $path;
-				}
-			}
-		} elseif ($type === "script") {
-			if (!in_array($path, self::$scripts)) {
-				if ($prepend === true) {
-					array_unshift ( self::$scripts, $path );
-				} else {
-					self::$scripts [] = $path;
-				}
-			}
-		}
-	}
-
-	/**
-	 * Add a custom element to the header
-	 * If $text is null then the element will be written as empty element.
-	 * So use "" to get a closing tag.
-	 * @param string $tag tag name of the element
-	 * @param array $attributes array of attributes for the element
-	 * @param string $text the text content for the element
-	 * @param bool $prepend prepend the header to the beginning of the list
-	 */
-	public static function addHeader($tag, $attributes, $text = null, $prepend = false) {
-		$header = [
-			'tag' => $tag,
-			'attributes' => $attributes,
-			'text' => $text
-		];
-		if ($prepend === true) {
-			array_unshift (self::$headers, $header);
-
-		} else {
-			self::$headers[] = $header;
-		}
-	}
-
-	/**
-	 * check if the current server configuration is suitable for ownCloud
-	 *
-	 * @param \OC\SystemConfig $config
-	 * @return array arrays with error messages and hints
-	 */
-	public static function checkServer(\OC\SystemConfig $config) {
-		$l = \OC::$server->getL10N('lib');
-		$errors = [];
-		$CONFIG_DATADIRECTORY = $config->getValue('datadirectory', OC::$SERVERROOT . '/data');
-
-		if (!self::needUpgrade($config) && $config->getValue('installed', false)) {
-			// this check needs to be done every time
-			$errors = self::checkDataDirectoryValidity($CONFIG_DATADIRECTORY);
-		}
-
-		// Assume that if checkServer() succeeded before in this session, then all is fine.
-		if (\OC::$server->getSession()->exists('checkServer_succeeded') && \OC::$server->getSession()->get('checkServer_succeeded')) {
-			return $errors;
-		}
-
-		$webServerRestart = false;
-		$setup = new \OC\Setup(
-			$config,
-			\OC::$server->getIniWrapper(),
-			\OC::$server->getL10N('lib'),
-			\OC::$server->query(\OCP\Defaults::class),
-			\OC::$server->getLogger(),
-			\OC::$server->getSecureRandom(),
-			\OC::$server->query(\OC\Installer::class)
-		);
-
-		$urlGenerator = \OC::$server->getURLGenerator();
-
-		$availableDatabases = $setup->getSupportedDatabases();
-		if (empty($availableDatabases)) {
-			$errors[] = [
-				'error' => $l->t('No database drivers (sqlite, mysql, or postgresql) installed.'),
-				'hint' => '' //TODO: sane hint
-			];
-			$webServerRestart = true;
-		}
-
-		// Check if config folder is writable.
-		if(!OC_Helper::isReadOnlyConfigEnabled()) {
-			if (!is_writable(OC::$configDir) or !is_readable(OC::$configDir)) {
-				$errors[] = [
-					'error' => $l->t('Cannot write into "config" directory'),
-					'hint' => $l->t('This can usually be fixed by giving the webserver write access to the config directory. See %s',
-						[ $urlGenerator->linkToDocs('admin-dir_permissions') ]) . '. '
-						. $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it. See %s',
-						[ $urlGenerator->linkToDocs('admin-config') ] )
-				];
-			}
-		}
-
-		// Check if there is a writable install folder.
-		if ($config->getValue('appstoreenabled', true)) {
-			if (OC_App::getInstallPath() === null
-				|| !is_writable(OC_App::getInstallPath())
-				|| !is_readable(OC_App::getInstallPath())
-			) {
-				$errors[] = [
-					'error' => $l->t('Cannot write into "apps" directory'),
-					'hint' => $l->t('This can usually be fixed by giving the webserver write access to the apps directory'
-						. ' or disabling the appstore in the config file.')
-				];
-			}
-		}
-		// Create root dir.
-		if ($config->getValue('installed', false)) {
-			if (!is_dir($CONFIG_DATADIRECTORY)) {
-				$success = @mkdir($CONFIG_DATADIRECTORY);
-				if ($success) {
-					$errors = array_merge($errors, self::checkDataDirectoryPermissions($CONFIG_DATADIRECTORY));
-				} else {
-					$errors[] = [
-						'error' => $l->t('Cannot create "data" directory'),
-						'hint' => $l->t('This can usually be fixed by giving the webserver write access to the root directory. See %s',
-							[$urlGenerator->linkToDocs('admin-dir_permissions')])
-					];
-				}
-			} else if (!is_writable($CONFIG_DATADIRECTORY) or !is_readable($CONFIG_DATADIRECTORY)) {
-				// is_writable doesn't work for NFS mounts, so try to write a file and check if it exists.
-				$testFile = sprintf('%s/%s.tmp', $CONFIG_DATADIRECTORY, uniqid('data_dir_writability_test_'));
-				$handle = fopen($testFile, 'w');
-				if (!$handle || fwrite($handle, 'Test write operation') === false) {
-					$permissionsHint = $l->t('Permissions can usually be fixed by giving the webserver write access to the root directory. See %s.',
-						[$urlGenerator->linkToDocs('admin-dir_permissions')]);
-					$errors[] = [
-						'error' => 'Your data directory is not writable',
-						'hint' => $permissionsHint
-					];
-				} else {
-					fclose($handle);
-					unlink($testFile);
-				}
-			} else {
-				$errors = array_merge($errors, self::checkDataDirectoryPermissions($CONFIG_DATADIRECTORY));
-			}
-		}
-
-		if (!OC_Util::isSetLocaleWorking()) {
-			$errors[] = [
-				'error' => $l->t('Setting locale to %s failed',
-					['en_US.UTF-8/fr_FR.UTF-8/es_ES.UTF-8/de_DE.UTF-8/ru_RU.UTF-8/'
-						. 'pt_BR.UTF-8/it_IT.UTF-8/ja_JP.UTF-8/zh_CN.UTF-8']),
-				'hint' => $l->t('Please install one of these locales on your system and restart your webserver.')
-			];
-		}
-
-		// Contains the dependencies that should be checked against
-		// classes = class_exists
-		// functions = function_exists
-		// defined = defined
-		// ini = ini_get
-		// If the dependency is not found the missing module name is shown to the EndUser
-		// When adding new checks always verify that they pass on Travis as well
-		// for ini settings, see https://github.com/owncloud/administration/blob/master/travis-ci/custom.ini
-		$dependencies = [
-			'classes' => [
-				'ZipArchive' => 'zip',
-				'DOMDocument' => 'dom',
-				'XMLWriter' => 'XMLWriter',
-				'XMLReader' => 'XMLReader',
-			],
-			'functions' => [
-				'xml_parser_create' => 'libxml',
-				'mb_strcut' => 'mbstring',
-				'ctype_digit' => 'ctype',
-				'json_encode' => 'JSON',
-				'gd_info' => 'GD',
-				'gzencode' => 'zlib',
-				'iconv' => 'iconv',
-				'simplexml_load_string' => 'SimpleXML',
-				'hash' => 'HASH Message Digest Framework',
-				'curl_init' => 'cURL',
-				'openssl_verify' => 'OpenSSL',
-			],
-			'defined' => [
-				'PDO::ATTR_DRIVER_NAME' => 'PDO'
-			],
-			'ini' => [
-				'default_charset' => 'UTF-8',
-			],
-		];
-		$missingDependencies = [];
-		$invalidIniSettings = [];
-		$moduleHint = $l->t('Please ask your server administrator to install the module.');
-
-		$iniWrapper = \OC::$server->getIniWrapper();
-		foreach ($dependencies['classes'] as $class => $module) {
-			if (!class_exists($class)) {
-				$missingDependencies[] = $module;
-			}
-		}
-		foreach ($dependencies['functions'] as $function => $module) {
-			if (!function_exists($function)) {
-				$missingDependencies[] = $module;
-			}
-		}
-		foreach ($dependencies['defined'] as $defined => $module) {
-			if (!defined($defined)) {
-				$missingDependencies[] = $module;
-			}
-		}
-		foreach ($dependencies['ini'] as $setting => $expected) {
-			if (is_bool($expected)) {
-				if ($iniWrapper->getBool($setting) !== $expected) {
-					$invalidIniSettings[] = [$setting, $expected];
-				}
-			}
-			if (is_int($expected)) {
-				if ($iniWrapper->getNumeric($setting) !== $expected) {
-					$invalidIniSettings[] = [$setting, $expected];
-				}
-			}
-			if (is_string($expected)) {
-				if (strtolower($iniWrapper->getString($setting)) !== strtolower($expected)) {
-					$invalidIniSettings[] = [$setting, $expected];
-				}
-			}
-		}
-
-		foreach($missingDependencies as $missingDependency) {
-			$errors[] = [
-				'error' => $l->t('PHP module %s not installed.', [$missingDependency]),
-				'hint' => $moduleHint
-			];
-			$webServerRestart = true;
-		}
-		foreach($invalidIniSettings as $setting) {
-			if(is_bool($setting[1])) {
-				$setting[1] = $setting[1] ? 'on' : 'off';
-			}
-			$errors[] = [
-				'error' => $l->t('PHP setting "%s" is not set to "%s".', [$setting[0], var_export($setting[1], true)]),
-				'hint' =>  $l->t('Adjusting this setting in php.ini will make Nextcloud run again')
-			];
-			$webServerRestart = true;
-		}
-
-		/**
-		 * The mbstring.func_overload check can only be performed if the mbstring
-		 * module is installed as it will return null if the checking setting is
-		 * not available and thus a check on the boolean value fails.
-		 *
-		 * TODO: Should probably be implemented in the above generic dependency
-		 *       check somehow in the long-term.
-		 */
-		if($iniWrapper->getBool('mbstring.func_overload') !== null &&
-			$iniWrapper->getBool('mbstring.func_overload') === true) {
-			$errors[] = [
-				'error' => $l->t('mbstring.func_overload is set to "%s" instead of the expected value "0"', [$iniWrapper->getString('mbstring.func_overload')]),
-				'hint' => $l->t('To fix this issue set <code>mbstring.func_overload</code> to <code>0</code> in your php.ini')
-			];
-		}
-
-		if(function_exists('xml_parser_create') &&
-			LIBXML_LOADED_VERSION < 20700 ) {
-			$version = LIBXML_LOADED_VERSION;
-			$major = floor($version/10000);
-			$version -= ($major * 10000);
-			$minor = floor($version/100);
-			$version -= ($minor * 100);
-			$patch = $version;
-			$errors[] = [
-				'error' => $l->t('libxml2 2.7.0 is at least required. Currently %s is installed.', [$major . '.' . $minor . '.' . $patch]),
-				'hint' => $l->t('To fix this issue update your libxml2 version and restart your web server.')
-			];
-		}
-
-		if (!self::isAnnotationsWorking()) {
-			$errors[] = [
-				'error' => $l->t('PHP is apparently set up to strip inline doc blocks. This will make several core apps inaccessible.'),
-				'hint' => $l->t('This is probably caused by a cache/accelerator such as Zend OPcache or eAccelerator.')
-			];
-		}
-
-		if (!\OC::$CLI && $webServerRestart) {
-			$errors[] = [
-				'error' => $l->t('PHP modules have been installed, but they are still listed as missing?'),
-				'hint' => $l->t('Please ask your server administrator to restart the web server.')
-			];
-		}
-
-		$errors = array_merge($errors, self::checkDatabaseVersion());
-
-		// Cache the result of this function
-		\OC::$server->getSession()->set('checkServer_succeeded', count($errors) == 0);
-
-		return $errors;
-	}
-
-	/**
-	 * Check the database version
-	 *
-	 * @return array errors array
-	 */
-	public static function checkDatabaseVersion() {
-		$l = \OC::$server->getL10N('lib');
-		$errors = [];
-		$dbType = \OC::$server->getSystemConfig()->getValue('dbtype', 'sqlite');
-		if ($dbType === 'pgsql') {
-			// check PostgreSQL version
-			try {
-				$result = \OC_DB::executeAudited('SHOW SERVER_VERSION');
-				$data = $result->fetchRow();
-				if (isset($data['server_version'])) {
-					$version = $data['server_version'];
-					if (version_compare($version, '9.0.0', '<')) {
-						$errors[] = [
-							'error' => $l->t('PostgreSQL >= 9 required'),
-							'hint' => $l->t('Please upgrade your database version')
-						];
-					}
-				}
-			} catch (\Doctrine\DBAL\DBALException $e) {
-				$logger = \OC::$server->getLogger();
-				$logger->warning('Error occurred while checking PostgreSQL version, assuming >= 9');
-				$logger->logException($e);
-			}
-		}
-		return $errors;
-	}
-
-	/**
-	 * Check for correct file permissions of data directory
-	 *
-	 * @param string $dataDirectory
-	 * @return array arrays with error messages and hints
-	 */
-	public static function checkDataDirectoryPermissions($dataDirectory) {
-		if(\OC::$server->getConfig()->getSystemValue('check_data_directory_permissions', true) === false) {
-			return  [];
-		}
-		$l = \OC::$server->getL10N('lib');
-		$errors = [];
-		$permissionsModHint = $l->t('Please change the permissions to 0770 so that the directory'
-			. ' cannot be listed by other users.');
-		$perms = substr(decoct(@fileperms($dataDirectory)), -3);
-		if (substr($perms, -1) !== '0') {
-			chmod($dataDirectory, 0770);
-			clearstatcache();
-			$perms = substr(decoct(@fileperms($dataDirectory)), -3);
-			if ($perms[2] !== '0') {
-				$errors[] = [
-					'error' => $l->t('Your data directory is readable by other users'),
-					'hint' => $permissionsModHint
-				];
-			}
-		}
-		return $errors;
-	}
-
-	/**
-	 * Check that the data directory exists and is valid by
-	 * checking the existence of the ".ocdata" file.
-	 *
-	 * @param string $dataDirectory data directory path
-	 * @return array errors found
-	 */
-	public static function checkDataDirectoryValidity($dataDirectory) {
-		$l = \OC::$server->getL10N('lib');
-		$errors = [];
-		if ($dataDirectory[0] !== '/') {
-			$errors[] = [
-				'error' => $l->t('Your data directory must be an absolute path'),
-				'hint' => $l->t('Check the value of "datadirectory" in your configuration')
-			];
-		}
-		if (!file_exists($dataDirectory . '/.ocdata')) {
-			$errors[] = [
-				'error' => $l->t('Your data directory is invalid'),
-				'hint' => $l->t('Ensure there is a file called ".ocdata"' .
-					' in the root of the data directory.')
-			];
-		}
-		return $errors;
-	}
-
-	/**
-	 * Check if the user is logged in, redirects to home if not. With
-	 * redirect URL parameter to the request URI.
-	 *
-	 * @return void
-	 */
-	public static function checkLoggedIn() {
-		// Check if we are a user
-		if (!\OC::$server->getUserSession()->isLoggedIn()) {
-			header('Location: ' . \OC::$server->getURLGenerator()->linkToRoute(
-						'core.login.showLoginForm',
-						[
-							'redirect_url' => \OC::$server->getRequest()->getRequestUri(),
-						]
-					)
-			);
-			exit();
-		}
-		// Redirect to 2FA challenge selection if 2FA challenge was not solved yet
-		if (\OC::$server->getTwoFactorAuthManager()->needsSecondFactor(\OC::$server->getUserSession()->getUser())) {
-			header('Location: ' . \OC::$server->getURLGenerator()->linkToRoute('core.TwoFactorChallenge.selectChallenge'));
-			exit();
-		}
-	}
-
-	/**
-	 * Check if the user is a admin, redirects to home if not
-	 *
-	 * @return void
-	 */
-	public static function checkAdminUser() {
-		OC_Util::checkLoggedIn();
-		if (!OC_User::isAdminUser(OC_User::getUser())) {
-			header('Location: ' . \OCP\Util::linkToAbsolute('', 'index.php'));
-			exit();
-		}
-	}
-
-	/**
-	 * Returns the URL of the default page
-	 * based on the system configuration and
-	 * the apps visible for the current user
-	 *
-	 * @return string URL
-	 * @suppress PhanDeprecatedFunction
-	 */
-	public static function getDefaultPageUrl() {
-		$urlGenerator = \OC::$server->getURLGenerator();
-		// Deny the redirect if the URL contains a @
-		// This prevents unvalidated redirects like ?redirect_url=:user@domain.com
-		if (isset($_REQUEST['redirect_url']) && strpos($_REQUEST['redirect_url'], '@') === false) {
-			$location = $urlGenerator->getAbsoluteURL(urldecode($_REQUEST['redirect_url']));
-		} else {
-			$defaultPage = \OC::$server->getConfig()->getAppValue('core', 'defaultpage');
-			if ($defaultPage) {
-				$location = $urlGenerator->getAbsoluteURL($defaultPage);
-			} else {
-				$appId = 'files';
-				$config = \OC::$server->getConfig();
-				$defaultApps = explode(',', $config->getSystemValue('defaultapp', 'files'));
-				// find the first app that is enabled for the current user
-				foreach ($defaultApps as $defaultApp) {
-					$defaultApp = OC_App::cleanAppId(strip_tags($defaultApp));
-					if (static::getAppManager()->isEnabledForUser($defaultApp)) {
-						$appId = $defaultApp;
-						break;
-					}
-				}
-
-				if($config->getSystemValue('htaccess.IgnoreFrontController', false) === true || getenv('front_controller_active') === 'true') {
-					$location = $urlGenerator->getAbsoluteURL('/apps/' . $appId . '/');
-				} else {
-					$location = $urlGenerator->getAbsoluteURL('/index.php/apps/' . $appId . '/');
-				}
-			}
-		}
-		return $location;
-	}
-
-	/**
-	 * Redirect to the user default page
-	 *
-	 * @return void
-	 */
-	public static function redirectToDefaultPage() {
-		$location = self::getDefaultPageUrl();
-		header('Location: ' . $location);
-		exit();
-	}
-
-	/**
-	 * get an id unique for this instance
-	 *
-	 * @return string
-	 */
-	public static function getInstanceId() {
-		$id = \OC::$server->getSystemConfig()->getValue('instanceid', null);
-		if (is_null($id)) {
-			// We need to guarantee at least one letter in instanceid so it can be used as the session_name
-			$id = 'oc' . \OC::$server->getSecureRandom()->generate(10, \OCP\Security\ISecureRandom::CHAR_LOWER.\OCP\Security\ISecureRandom::CHAR_DIGITS);
-			\OC::$server->getSystemConfig()->setValue('instanceid', $id);
-		}
-		return $id;
-	}
-
-	/**
-	 * Public function to sanitize HTML
-	 *
-	 * This function is used to sanitize HTML and should be applied on any
-	 * string or array of strings before displaying it on a web page.
-	 *
-	 * @param string|array $value
-	 * @return string|array an array of sanitized strings or a single sanitized string, depends on the input parameter.
-	 */
-	public static function sanitizeHTML($value) {
-		if (is_array($value)) {
-			$value = array_map(function($value) {
-				return self::sanitizeHTML($value);
-			}, $value);
-		} else {
-			// Specify encoding for PHP<5.4
-			$value = htmlspecialchars((string)$value, ENT_QUOTES, 'UTF-8');
-		}
-		return $value;
-	}
-
-	/**
-	 * Public function to encode url parameters
-	 *
-	 * This function is used to encode path to file before output.
-	 * Encoding is done according to RFC 3986 with one exception:
-	 * Character '/' is preserved as is.
-	 *
-	 * @param string $component part of URI to encode
-	 * @return string
-	 */
-	public static function encodePath($component) {
-		$encoded = rawurlencode($component);
-		$encoded = str_replace('%2F', '/', $encoded);
-		return $encoded;
-	}
-
-
-	public function createHtaccessTestFile(\OCP\IConfig $config) {
-		// php dev server does not support htaccess
-		if (php_sapi_name() === 'cli-server') {
-			return false;
-		}
-
-		// testdata
-		$fileName = '/htaccesstest.txt';
-		$testContent = 'This is used for testing whether htaccess is properly enabled to disallow access from the outside. This file can be safely removed.';
-
-		// creating a test file
-		$testFile = $config->getSystemValue('datadirectory', OC::$SERVERROOT . '/data') . '/' . $fileName;
-
-		if (file_exists($testFile)) {// already running this test, possible recursive call
-			return false;
-		}
-
-		$fp = @fopen($testFile, 'w');
-		if (!$fp) {
-			throw new OC\HintException('Can\'t create test file to check for working .htaccess file.',
-				'Make sure it is possible for the webserver to write to ' . $testFile);
-		}
-		fwrite($fp, $testContent);
-		fclose($fp);
-
-		return $testContent;
-	}
-
-	/**
-	 * Check if the .htaccess file is working
-	 * @param \OCP\IConfig $config
-	 * @return bool
-	 * @throws Exception
-	 * @throws \OC\HintException If the test file can't get written.
-	 */
-	public function isHtaccessWorking(\OCP\IConfig $config) {
-
-		if (\OC::$CLI || !$config->getSystemValue('check_for_working_htaccess', true)) {
-			return true;
-		}
-
-		$testContent = $this->createHtaccessTestFile($config);
-		if ($testContent === false) {
-			return false;
-		}
-
-		$fileName = '/htaccesstest.txt';
-		$testFile = $config->getSystemValue('datadirectory', OC::$SERVERROOT . '/data') . '/' . $fileName;
-
-		// accessing the file via http
-		$url = \OC::$server->getURLGenerator()->getAbsoluteURL(OC::$WEBROOT . '/data' . $fileName);
-		try {
-			$content = \OC::$server->getHTTPClientService()->newClient()->get($url)->getBody();
-		} catch (\Exception $e) {
-			$content = false;
-		}
-
-		if (strpos($url, 'https:') === 0) {
-			$url = 'http:' . substr($url, 6);
-		} else {
-			$url = 'https:' . substr($url, 5);
-		}
-
-		try {
-			$fallbackContent = \OC::$server->getHTTPClientService()->newClient()->get($url)->getBody();
-		} catch (\Exception $e) {
-			$fallbackContent = false;
-		}
-
-		// cleanup
-		@unlink($testFile);
-
-		/*
+            if ($mount->getOption('readonly', false)) {
+                return new \OC\Files\Storage\Wrapper\PermissionsMask([
+                    'storage' => $storage,
+                    'mask' => \OCP\Constants::PERMISSION_ALL & ~(
+                        \OCP\Constants::PERMISSION_UPDATE |
+                        \OCP\Constants::PERMISSION_CREATE |
+                        \OCP\Constants::PERMISSION_DELETE
+                    ),
+                ]);
+            }
+            return $storage;
+        });
+
+        OC_Hook::emit('OC_Filesystem', 'preSetup', ['user' => $user]);
+
+        \OC\Files\Filesystem::logWarningWhenAddingStorageWrapper($prevLogging);
+
+        //check if we are using an object storage
+        $objectStore = \OC::$server->getSystemConfig()->getValue('objectstore', null);
+        $objectStoreMultibucket = \OC::$server->getSystemConfig()->getValue('objectstore_multibucket', null);
+
+        // use the same order as in ObjectHomeMountProvider
+        if (isset($objectStoreMultibucket)) {
+            self::initObjectStoreMultibucketRootFS($objectStoreMultibucket);
+        } elseif (isset($objectStore)) {
+            self::initObjectStoreRootFS($objectStore);
+        } else {
+            self::initLocalStorageRootFS();
+        }
+
+        if ($user != '' && !\OC::$server->getUserManager()->userExists($user)) {
+            \OC::$server->getEventLogger()->end('setup_fs');
+            return false;
+        }
+
+        //if we aren't logged in, there is no use to set up the filesystem
+        if ($user != "") {
+
+            $userDir = '/' . $user . '/files';
+
+            //jail the user into his "home" directory
+            \OC\Files\Filesystem::init($user, $userDir);
+
+            OC_Hook::emit('OC_Filesystem', 'setup', ['user' => $user, 'user_dir' => $userDir]);
+        }
+        \OC::$server->getEventLogger()->end('setup_fs');
+        return true;
+    }
+
+    /**
+     * check if a password is required for each public link
+     *
+     * @return boolean
+     * @suppress PhanDeprecatedFunction
+     */
+    public static function isPublicLinkPasswordRequired() {
+        $enforcePassword = \OC::$server->getConfig()->getAppValue('core', 'shareapi_enforce_links_password', 'no');
+        return $enforcePassword === 'yes';
+    }
+
+    /**
+     * check if sharing is disabled for the current user
+     * @param IConfig $config
+     * @param IGroupManager $groupManager
+     * @param IUser|null $user
+     * @return bool
+     */
+    public static function isSharingDisabledForUser(IConfig $config, IGroupManager $groupManager, $user) {
+        if ($config->getAppValue('core', 'shareapi_exclude_groups', 'no') === 'yes') {
+            $groupsList = $config->getAppValue('core', 'shareapi_exclude_groups_list', '');
+            $excludedGroups = json_decode($groupsList);
+            if (is_null($excludedGroups)) {
+                $excludedGroups = explode(',', $groupsList);
+                $newValue = json_encode($excludedGroups);
+                $config->setAppValue('core', 'shareapi_exclude_groups_list', $newValue);
+            }
+            $usersGroups = $groupManager->getUserGroupIds($user);
+            if (!empty($usersGroups)) {
+                $remainingGroups = array_diff($usersGroups, $excludedGroups);
+                // if the user is only in groups which are disabled for sharing then
+                // sharing is also disabled for the user
+                if (empty($remainingGroups)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * check if share API enforces a default expire date
+     *
+     * @return boolean
+     * @suppress PhanDeprecatedFunction
+     */
+    public static function isDefaultExpireDateEnforced() {
+        $isDefaultExpireDateEnabled = \OC::$server->getConfig()->getAppValue('core', 'shareapi_default_expire_date', 'no');
+        $enforceDefaultExpireDate = false;
+        if ($isDefaultExpireDateEnabled === 'yes') {
+            $value = \OC::$server->getConfig()->getAppValue('core', 'shareapi_enforce_expire_date', 'no');
+            $enforceDefaultExpireDate = $value === 'yes';
+        }
+
+        return $enforceDefaultExpireDate;
+    }
+
+    /**
+     * Get the quota of a user
+     *
+     * @param IUser|null $user
+     * @return float Quota bytes
+     */
+    public static function getUserQuota(?IUser $user) {
+        if (is_null($user)) {
+            return \OCP\Files\FileInfo::SPACE_UNLIMITED;
+        }
+        $userQuota = $user->getQuota();
+        if($userQuota === 'none') {
+            return \OCP\Files\FileInfo::SPACE_UNLIMITED;
+        }
+        return OC_Helper::computerFileSize($userQuota);
+    }
+
+    /**
+     * copies the skeleton to the users /files
+     *
+     * @param string $userId
+     * @param \OCP\Files\Folder $userDirectory
+     * @throws \OCP\Files\NotFoundException
+     * @throws \OCP\Files\NotPermittedException
+     * @suppress PhanDeprecatedFunction
+     */
+    public static function copySkeleton($userId, \OCP\Files\Folder $userDirectory) {
+
+        $plainSkeletonDirectory = \OC::$server->getConfig()->getSystemValue('skeletondirectory', \OC::$SERVERROOT . '/core/skeleton');
+        $userLang = \OC::$server->getL10NFactory()->findLanguage();
+        $skeletonDirectory = str_replace('{lang}', $userLang, $plainSkeletonDirectory);
+
+        if (!file_exists($skeletonDirectory)) {
+            $dialectStart = strpos($userLang, '_');
+            if ($dialectStart !== false) {
+                $skeletonDirectory = str_replace('{lang}', substr($userLang, 0, $dialectStart), $plainSkeletonDirectory);
+            }
+            if ($dialectStart === false || !file_exists($skeletonDirectory)) {
+                $skeletonDirectory = str_replace('{lang}', 'default', $plainSkeletonDirectory);
+            }
+            if (!file_exists($skeletonDirectory)) {
+                $skeletonDirectory = '';
+            }
+        }
+
+        $instanceId = \OC::$server->getConfig()->getSystemValue('instanceid', '');
+
+        if ($instanceId === null) {
+            throw new \RuntimeException('no instance id!');
+        }
+        $appdata = 'appdata_' . $instanceId;
+        if ($userId === $appdata) {
+            throw new \RuntimeException('username is reserved name: ' . $appdata);
+        }
+
+        if (!empty($skeletonDirectory)) {
+            \OCP\Util::writeLog(
+                'files_skeleton',
+                'copying skeleton for '.$userId.' from '.$skeletonDirectory.' to '.$userDirectory->getFullPath('/'),
+                ILogger::DEBUG
+            );
+            self::copyr($skeletonDirectory, $userDirectory);
+            // update the file cache
+            $userDirectory->getStorage()->getScanner()->scan('', \OC\Files\Cache\Scanner::SCAN_RECURSIVE);
+        }
+    }
+
+    /**
+     * copies a directory recursively by using streams
+     *
+     * @param string $source
+     * @param \OCP\Files\Folder $target
+     * @return void
+     */
+    public static function copyr($source, \OCP\Files\Folder $target) {
+        $logger = \OC::$server->getLogger();
+
+        // Verify if folder exists
+        $dir = opendir($source);
+        if($dir === false) {
+            $logger->error(sprintf('Could not opendir "%s"', $source), ['app' => 'core']);
+            return;
+        }
+
+        // Copy the files
+        while (false !== ($file = readdir($dir))) {
+            if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
+                if (is_dir($source . '/' . $file)) {
+                    $child = $target->newFolder($file);
+                    self::copyr($source . '/' . $file, $child);
+                } else {
+                    $child = $target->newFile($file);
+                    $sourceStream = fopen($source . '/' . $file, 'r');
+                    if($sourceStream === false) {
+                        $logger->error(sprintf('Could not fopen "%s"', $source . '/' . $file), ['app' => 'core']);
+                        closedir($dir);
+                        return;
+                    }
+                    stream_copy_to_stream($sourceStream, $child->fopen('w'));
+                }
+            }
+        }
+        closedir($dir);
+    }
+
+    /**
+     * @return void
+     * @suppress PhanUndeclaredMethod
+     */
+    public static function tearDownFS() {
+        \OC\Files\Filesystem::tearDown();
+        \OC::$server->getRootFolder()->clearCache();
+        self::$fsSetup = false;
+        self::$rootMounted = false;
+    }
+
+    /**
+     * get the current installed version of ownCloud
+     *
+     * @return array
+     */
+    public static function getVersion() {
+        OC_Util::loadVersion();
+        return self::$versionCache['OC_Version'];
+    }
+
+    /**
+     * get the current installed version string of ownCloud
+     *
+     * @return string
+     */
+    public static function getVersionString() {
+        OC_Util::loadVersion();
+        return self::$versionCache['OC_VersionString'];
+    }
+
+    /**
+     * @deprecated the value is of no use anymore
+     * @return string
+     */
+    public static function getEditionString() {
+        return '';
+    }
+
+    /**
+     * @description get the update channel of the current installed of ownCloud.
+     * @return string
+     */
+    public static function getChannel() {
+        OC_Util::loadVersion();
+        return \OC::$server->getConfig()->getSystemValue('updater.release.channel', self::$versionCache['OC_Channel']);
+    }
+
+    /**
+     * @description get the build number of the current installed of ownCloud.
+     * @return string
+     */
+    public static function getBuild() {
+        OC_Util::loadVersion();
+        return self::$versionCache['OC_Build'];
+    }
+
+    /**
+     * @description load the version.php into the session as cache
+     * @suppress PhanUndeclaredVariable
+     */
+    private static function loadVersion() {
+        if (self::$versionCache !== null) {
+            return;
+        }
+
+        $timestamp = filemtime(OC::$SERVERROOT . '/version.php');
+        require OC::$SERVERROOT . '/version.php';
+        /** @var $timestamp int */
+        self::$versionCache['OC_Version_Timestamp'] = $timestamp;
+        /** @var $OC_Version string */
+        self::$versionCache['OC_Version'] = $OC_Version;
+        /** @var $OC_VersionString string */
+        self::$versionCache['OC_VersionString'] = $OC_VersionString;
+        /** @var $OC_Build string */
+        self::$versionCache['OC_Build'] = $OC_Build;
+
+        /** @var $OC_Channel string */
+        self::$versionCache['OC_Channel'] = $OC_Channel;
+    }
+
+    /**
+     * generates a path for JS/CSS files. If no application is provided it will create the path for core.
+     *
+     * @param string $application application to get the files from
+     * @param string $directory directory within this application (css, js, vendor, etc)
+     * @param string $file the file inside of the above folder
+     * @return string the path
+     */
+    private static function generatePath($application, $directory, $file) {
+        if (is_null($file)) {
+            $file = $application;
+            $application = "";
+        }
+        if (!empty($application)) {
+            return "$application/$directory/$file";
+        } else {
+            return "$directory/$file";
+        }
+    }
+
+    /**
+     * add a javascript file
+     *
+     * @param string $application application id
+     * @param string|null $file filename
+     * @param bool $prepend prepend the Script to the beginning of the list
+     * @return void
+     */
+    public static function addScript($application, $file = null, $prepend = false) {
+        $path = OC_Util::generatePath($application, 'js', $file);
+
+        // core js files need separate handling
+        if ($application !== 'core' && $file !== null) {
+            self::addTranslations ( $application );
+        }
+        self::addExternalResource($application, $prepend, $path, "script");
+    }
+
+    /**
+     * add a javascript file from the vendor sub folder
+     *
+     * @param string $application application id
+     * @param string|null $file filename
+     * @param bool $prepend prepend the Script to the beginning of the list
+     * @return void
+     */
+    public static function addVendorScript($application, $file = null, $prepend = false) {
+        $path = OC_Util::generatePath($application, 'vendor', $file);
+        self::addExternalResource($application, $prepend, $path, "script");
+    }
+
+    /**
+     * add a translation JS file
+     *
+     * @param string $application application id
+     * @param string|null $languageCode language code, defaults to the current language
+     * @param bool|null $prepend prepend the Script to the beginning of the list
+     */
+    public static function addTranslations($application, $languageCode = null, $prepend = false) {
+        if (is_null($languageCode)) {
+            $languageCode = \OC::$server->getL10NFactory()->findLanguage($application);
+        }
+        if (!empty($application)) {
+            $path = "$application/l10n/$languageCode";
+        } else {
+            $path = "l10n/$languageCode";
+        }
+        self::addExternalResource($application, $prepend, $path, "script");
+    }
+
+    /**
+     * add a css file
+     *
+     * @param string $application application id
+     * @param string|null $file filename
+     * @param bool $prepend prepend the Style to the beginning of the list
+     * @return void
+     */
+    public static function addStyle($application, $file = null, $prepend = false) {
+        $path = OC_Util::generatePath($application, 'css', $file);
+        self::addExternalResource($application, $prepend, $path, "style");
+    }
+
+    /**
+     * add a css file from the vendor sub folder
+     *
+     * @param string $application application id
+     * @param string|null $file filename
+     * @param bool $prepend prepend the Style to the beginning of the list
+     * @return void
+     */
+    public static function addVendorStyle($application, $file = null, $prepend = false) {
+        $path = OC_Util::generatePath($application, 'vendor', $file);
+        self::addExternalResource($application, $prepend, $path, "style");
+    }
+
+    /**
+     * add an external resource css/js file
+     *
+     * @param string $application application id
+     * @param bool $prepend prepend the file to the beginning of the list
+     * @param string $path
+     * @param string $type (script or style)
+     * @return void
+     */
+    private static function addExternalResource($application, $prepend, $path, $type = "script") {
+
+        if ($type === "style") {
+            if (!in_array($path, self::$styles)) {
+                if ($prepend === true) {
+                    array_unshift ( self::$styles, $path );
+                } else {
+                    self::$styles[] = $path;
+                }
+            }
+        } elseif ($type === "script") {
+            if (!in_array($path, self::$scripts)) {
+                if ($prepend === true) {
+                    array_unshift ( self::$scripts, $path );
+                } else {
+                    self::$scripts [] = $path;
+                }
+            }
+        }
+    }
+
+    /**
+     * Add a custom element to the header
+     * If $text is null then the element will be written as empty element.
+     * So use "" to get a closing tag.
+     * @param string $tag tag name of the element
+     * @param array $attributes array of attributes for the element
+     * @param string $text the text content for the element
+     * @param bool $prepend prepend the header to the beginning of the list
+     */
+    public static function addHeader($tag, $attributes, $text = null, $prepend = false) {
+        $header = [
+            'tag' => $tag,
+            'attributes' => $attributes,
+            'text' => $text
+        ];
+        if ($prepend === true) {
+            array_unshift (self::$headers, $header);
+
+        } else {
+            self::$headers[] = $header;
+        }
+    }
+
+    /**
+     * check if the current server configuration is suitable for ownCloud
+     *
+     * @param \OC\SystemConfig $config
+     * @return array arrays with error messages and hints
+     */
+    public static function checkServer(\OC\SystemConfig $config) {
+        $l = \OC::$server->getL10N('lib');
+        $errors = [];
+        $CONFIG_DATADIRECTORY = $config->getValue('datadirectory', OC::$SERVERROOT . '/data');
+
+        if (!self::needUpgrade($config) && $config->getValue('installed', false)) {
+            // this check needs to be done every time
+            $errors = self::checkDataDirectoryValidity($CONFIG_DATADIRECTORY);
+        }
+
+        // Assume that if checkServer() succeeded before in this session, then all is fine.
+        if (\OC::$server->getSession()->exists('checkServer_succeeded') && \OC::$server->getSession()->get('checkServer_succeeded')) {
+            return $errors;
+        }
+
+        $webServerRestart = false;
+        $setup = new \OC\Setup(
+            $config,
+            \OC::$server->getIniWrapper(),
+            \OC::$server->getL10N('lib'),
+            \OC::$server->query(\OCP\Defaults::class),
+            \OC::$server->getLogger(),
+            \OC::$server->getSecureRandom(),
+            \OC::$server->query(\OC\Installer::class)
+        );
+
+        $urlGenerator = \OC::$server->getURLGenerator();
+
+        $availableDatabases = $setup->getSupportedDatabases();
+        if (empty($availableDatabases)) {
+            $errors[] = [
+                'error' => $l->t('No database drivers (sqlite, mysql, or postgresql) installed.'),
+                'hint' => '' //TODO: sane hint
+            ];
+            $webServerRestart = true;
+        }
+
+        // Check if config folder is writable.
+        if(!OC_Helper::isReadOnlyConfigEnabled()) {
+            if (!is_writable(OC::$configDir) or !is_readable(OC::$configDir)) {
+                $errors[] = [
+                    'error' => $l->t('Cannot write into "config" directory'),
+                    'hint' => $l->t('This can usually be fixed by giving the webserver write access to the config directory. See %s',
+                        [ $urlGenerator->linkToDocs('admin-dir_permissions') ]) . '. '
+                        . $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it. See %s',
+                        [ $urlGenerator->linkToDocs('admin-config') ] )
+                ];
+            }
+        }
+
+        // Check if there is a writable install folder.
+        if ($config->getValue('appstoreenabled', true)) {
+            if (OC_App::getInstallPath() === null
+                || !is_writable(OC_App::getInstallPath())
+                || !is_readable(OC_App::getInstallPath())
+            ) {
+                $errors[] = [
+                    'error' => $l->t('Cannot write into "apps" directory'),
+                    'hint' => $l->t('This can usually be fixed by giving the webserver write access to the apps directory'
+                        . ' or disabling the appstore in the config file.')
+                ];
+            }
+        }
+        // Create root dir.
+        if ($config->getValue('installed', false)) {
+            if (!is_dir($CONFIG_DATADIRECTORY)) {
+                $success = @mkdir($CONFIG_DATADIRECTORY);
+                if ($success) {
+                    $errors = array_merge($errors, self::checkDataDirectoryPermissions($CONFIG_DATADIRECTORY));
+                } else {
+                    $errors[] = [
+                        'error' => $l->t('Cannot create "data" directory'),
+                        'hint' => $l->t('This can usually be fixed by giving the webserver write access to the root directory. See %s',
+                            [$urlGenerator->linkToDocs('admin-dir_permissions')])
+                    ];
+                }
+            } else if (!is_writable($CONFIG_DATADIRECTORY) or !is_readable($CONFIG_DATADIRECTORY)) {
+                // is_writable doesn't work for NFS mounts, so try to write a file and check if it exists.
+                $testFile = sprintf('%s/%s.tmp', $CONFIG_DATADIRECTORY, uniqid('data_dir_writability_test_'));
+                $handle = fopen($testFile, 'w');
+                if (!$handle || fwrite($handle, 'Test write operation') === false) {
+                    $permissionsHint = $l->t('Permissions can usually be fixed by giving the webserver write access to the root directory. See %s.',
+                        [$urlGenerator->linkToDocs('admin-dir_permissions')]);
+                    $errors[] = [
+                        'error' => 'Your data directory is not writable',
+                        'hint' => $permissionsHint
+                    ];
+                } else {
+                    fclose($handle);
+                    unlink($testFile);
+                }
+            } else {
+                $errors = array_merge($errors, self::checkDataDirectoryPermissions($CONFIG_DATADIRECTORY));
+            }
+        }
+
+        if (!OC_Util::isSetLocaleWorking()) {
+            $errors[] = [
+                'error' => $l->t('Setting locale to %s failed',
+                    ['en_US.UTF-8/fr_FR.UTF-8/es_ES.UTF-8/de_DE.UTF-8/ru_RU.UTF-8/'
+                        . 'pt_BR.UTF-8/it_IT.UTF-8/ja_JP.UTF-8/zh_CN.UTF-8']),
+                'hint' => $l->t('Please install one of these locales on your system and restart your webserver.')
+            ];
+        }
+
+        // Contains the dependencies that should be checked against
+        // classes = class_exists
+        // functions = function_exists
+        // defined = defined
+        // ini = ini_get
+        // If the dependency is not found the missing module name is shown to the EndUser
+        // When adding new checks always verify that they pass on Travis as well
+        // for ini settings, see https://github.com/owncloud/administration/blob/master/travis-ci/custom.ini
+        $dependencies = [
+            'classes' => [
+                'ZipArchive' => 'zip',
+                'DOMDocument' => 'dom',
+                'XMLWriter' => 'XMLWriter',
+                'XMLReader' => 'XMLReader',
+            ],
+            'functions' => [
+                'xml_parser_create' => 'libxml',
+                'mb_strcut' => 'mbstring',
+                'ctype_digit' => 'ctype',
+                'json_encode' => 'JSON',
+                'gd_info' => 'GD',
+                'gzencode' => 'zlib',
+                'iconv' => 'iconv',
+                'simplexml_load_string' => 'SimpleXML',
+                'hash' => 'HASH Message Digest Framework',
+                'curl_init' => 'cURL',
+                'openssl_verify' => 'OpenSSL',
+            ],
+            'defined' => [
+                'PDO::ATTR_DRIVER_NAME' => 'PDO'
+            ],
+            'ini' => [
+                'default_charset' => 'UTF-8',
+            ],
+        ];
+        $missingDependencies = [];
+        $invalidIniSettings = [];
+        $moduleHint = $l->t('Please ask your server administrator to install the module.');
+
+        $iniWrapper = \OC::$server->getIniWrapper();
+        foreach ($dependencies['classes'] as $class => $module) {
+            if (!class_exists($class)) {
+                $missingDependencies[] = $module;
+            }
+        }
+        foreach ($dependencies['functions'] as $function => $module) {
+            if (!function_exists($function)) {
+                $missingDependencies[] = $module;
+            }
+        }
+        foreach ($dependencies['defined'] as $defined => $module) {
+            if (!defined($defined)) {
+                $missingDependencies[] = $module;
+            }
+        }
+        foreach ($dependencies['ini'] as $setting => $expected) {
+            if (is_bool($expected)) {
+                if ($iniWrapper->getBool($setting) !== $expected) {
+                    $invalidIniSettings[] = [$setting, $expected];
+                }
+            }
+            if (is_int($expected)) {
+                if ($iniWrapper->getNumeric($setting) !== $expected) {
+                    $invalidIniSettings[] = [$setting, $expected];
+                }
+            }
+            if (is_string($expected)) {
+                if (strtolower($iniWrapper->getString($setting)) !== strtolower($expected)) {
+                    $invalidIniSettings[] = [$setting, $expected];
+                }
+            }
+        }
+
+        foreach($missingDependencies as $missingDependency) {
+            $errors[] = [
+                'error' => $l->t('PHP module %s not installed.', [$missingDependency]),
+                'hint' => $moduleHint
+            ];
+            $webServerRestart = true;
+        }
+        foreach($invalidIniSettings as $setting) {
+            if(is_bool($setting[1])) {
+                $setting[1] = $setting[1] ? 'on' : 'off';
+            }
+            $errors[] = [
+                'error' => $l->t('PHP setting "%s" is not set to "%s".', [$setting[0], var_export($setting[1], true)]),
+                'hint' =>  $l->t('Adjusting this setting in php.ini will make Nextcloud run again')
+            ];
+            $webServerRestart = true;
+        }
+
+        /**
+         * The mbstring.func_overload check can only be performed if the mbstring
+         * module is installed as it will return null if the checking setting is
+         * not available and thus a check on the boolean value fails.
+         *
+         * TODO: Should probably be implemented in the above generic dependency
+         *       check somehow in the long-term.
+         */
+        if($iniWrapper->getBool('mbstring.func_overload') !== null &&
+            $iniWrapper->getBool('mbstring.func_overload') === true) {
+            $errors[] = [
+                'error' => $l->t('mbstring.func_overload is set to "%s" instead of the expected value "0"', [$iniWrapper->getString('mbstring.func_overload')]),
+                'hint' => $l->t('To fix this issue set <code>mbstring.func_overload</code> to <code>0</code> in your php.ini')
+            ];
+        }
+
+        if(function_exists('xml_parser_create') &&
+            LIBXML_LOADED_VERSION < 20700 ) {
+            $version = LIBXML_LOADED_VERSION;
+            $major = floor($version/10000);
+            $version -= ($major * 10000);
+            $minor = floor($version/100);
+            $version -= ($minor * 100);
+            $patch = $version;
+            $errors[] = [
+                'error' => $l->t('libxml2 2.7.0 is at least required. Currently %s is installed.', [$major . '.' . $minor . '.' . $patch]),
+                'hint' => $l->t('To fix this issue update your libxml2 version and restart your web server.')
+            ];
+        }
+
+        if (!self::isAnnotationsWorking()) {
+            $errors[] = [
+                'error' => $l->t('PHP is apparently set up to strip inline doc blocks. This will make several core apps inaccessible.'),
+                'hint' => $l->t('This is probably caused by a cache/accelerator such as Zend OPcache or eAccelerator.')
+            ];
+        }
+
+        if (!\OC::$CLI && $webServerRestart) {
+            $errors[] = [
+                'error' => $l->t('PHP modules have been installed, but they are still listed as missing?'),
+                'hint' => $l->t('Please ask your server administrator to restart the web server.')
+            ];
+        }
+
+        $errors = array_merge($errors, self::checkDatabaseVersion());
+
+        // Cache the result of this function
+        \OC::$server->getSession()->set('checkServer_succeeded', count($errors) == 0);
+
+        return $errors;
+    }
+
+    /**
+     * Check the database version
+     *
+     * @return array errors array
+     */
+    public static function checkDatabaseVersion() {
+        $l = \OC::$server->getL10N('lib');
+        $errors = [];
+        $dbType = \OC::$server->getSystemConfig()->getValue('dbtype', 'sqlite');
+        if ($dbType === 'pgsql') {
+            // check PostgreSQL version
+            try {
+                $result = \OC_DB::executeAudited('SHOW SERVER_VERSION');
+                $data = $result->fetchRow();
+                if (isset($data['server_version'])) {
+                    $version = $data['server_version'];
+                    if (version_compare($version, '9.0.0', '<')) {
+                        $errors[] = [
+                            'error' => $l->t('PostgreSQL >= 9 required'),
+                            'hint' => $l->t('Please upgrade your database version')
+                        ];
+                    }
+                }
+            } catch (\Doctrine\DBAL\DBALException $e) {
+                $logger = \OC::$server->getLogger();
+                $logger->warning('Error occurred while checking PostgreSQL version, assuming >= 9');
+                $logger->logException($e);
+            }
+        }
+        return $errors;
+    }
+
+    /**
+     * Check for correct file permissions of data directory
+     *
+     * @param string $dataDirectory
+     * @return array arrays with error messages and hints
+     */
+    public static function checkDataDirectoryPermissions($dataDirectory) {
+        if(\OC::$server->getConfig()->getSystemValue('check_data_directory_permissions', true) === false) {
+            return  [];
+        }
+        $l = \OC::$server->getL10N('lib');
+        $errors = [];
+        $permissionsModHint = $l->t('Please change the permissions to 0770 so that the directory'
+            . ' cannot be listed by other users.');
+        $perms = substr(decoct(@fileperms($dataDirectory)), -3);
+        if (substr($perms, -1) !== '0') {
+            chmod($dataDirectory, 0770);
+            clearstatcache();
+            $perms = substr(decoct(@fileperms($dataDirectory)), -3);
+            if ($perms[2] !== '0') {
+                $errors[] = [
+                    'error' => $l->t('Your data directory is readable by other users'),
+                    'hint' => $permissionsModHint
+                ];
+            }
+        }
+        return $errors;
+    }
+
+    /**
+     * Check that the data directory exists and is valid by
+     * checking the existence of the ".ocdata" file.
+     *
+     * @param string $dataDirectory data directory path
+     * @return array errors found
+     */
+    public static function checkDataDirectoryValidity($dataDirectory) {
+        $l = \OC::$server->getL10N('lib');
+        $errors = [];
+        if ($dataDirectory[0] !== '/') {
+            $errors[] = [
+                'error' => $l->t('Your data directory must be an absolute path'),
+                'hint' => $l->t('Check the value of "datadirectory" in your configuration')
+            ];
+        }
+        if (!file_exists($dataDirectory . '/.ocdata')) {
+            $errors[] = [
+                'error' => $l->t('Your data directory is invalid'),
+                'hint' => $l->t('Ensure there is a file called ".ocdata"' .
+                    ' in the root of the data directory.')
+            ];
+        }
+        return $errors;
+    }
+
+    /**
+     * Check if the user is logged in, redirects to home if not. With
+     * redirect URL parameter to the request URI.
+     *
+     * @return void
+     */
+    public static function checkLoggedIn() {
+        // Check if we are a user
+        if (!\OC::$server->getUserSession()->isLoggedIn()) {
+            header('Location: ' . \OC::$server->getURLGenerator()->linkToRoute(
+                        'core.login.showLoginForm',
+                        [
+                            'redirect_url' => \OC::$server->getRequest()->getRequestUri(),
+                        ]
+                    )
+            );
+            exit();
+        }
+        // Redirect to 2FA challenge selection if 2FA challenge was not solved yet
+        if (\OC::$server->getTwoFactorAuthManager()->needsSecondFactor(\OC::$server->getUserSession()->getUser())) {
+            header('Location: ' . \OC::$server->getURLGenerator()->linkToRoute('core.TwoFactorChallenge.selectChallenge'));
+            exit();
+        }
+    }
+
+    /**
+     * Check if the user is a admin, redirects to home if not
+     *
+     * @return void
+     */
+    public static function checkAdminUser() {
+        OC_Util::checkLoggedIn();
+        if (!OC_User::isAdminUser(OC_User::getUser())) {
+            header('Location: ' . \OCP\Util::linkToAbsolute('', 'index.php'));
+            exit();
+        }
+    }
+
+    /**
+     * Returns the URL of the default page
+     * based on the system configuration and
+     * the apps visible for the current user
+     *
+     * @return string URL
+     * @suppress PhanDeprecatedFunction
+     */
+    public static function getDefaultPageUrl() {
+        $urlGenerator = \OC::$server->getURLGenerator();
+        // Deny the redirect if the URL contains a @
+        // This prevents unvalidated redirects like ?redirect_url=:user@domain.com
+        if (isset($_REQUEST['redirect_url']) && strpos($_REQUEST['redirect_url'], '@') === false) {
+            $location = $urlGenerator->getAbsoluteURL(urldecode($_REQUEST['redirect_url']));
+        } else {
+            $defaultPage = \OC::$server->getConfig()->getAppValue('core', 'defaultpage');
+            if ($defaultPage) {
+                $location = $urlGenerator->getAbsoluteURL($defaultPage);
+            } else {
+                $appId = 'files';
+                $config = \OC::$server->getConfig();
+                $defaultApps = explode(',', $config->getSystemValue('defaultapp', 'files'));
+                // find the first app that is enabled for the current user
+                foreach ($defaultApps as $defaultApp) {
+                    $defaultApp = OC_App::cleanAppId(strip_tags($defaultApp));
+                    if (static::getAppManager()->isEnabledForUser($defaultApp)) {
+                        $appId = $defaultApp;
+                        break;
+                    }
+                }
+
+                if($config->getSystemValue('htaccess.IgnoreFrontController', false) === true || getenv('front_controller_active') === 'true') {
+                    $location = $urlGenerator->getAbsoluteURL('/apps/' . $appId . '/');
+                } else {
+                    $location = $urlGenerator->getAbsoluteURL('/index.php/apps/' . $appId . '/');
+                }
+            }
+        }
+        return $location;
+    }
+
+    /**
+     * Redirect to the user default page
+     *
+     * @return void
+     */
+    public static function redirectToDefaultPage() {
+        $location = self::getDefaultPageUrl();
+        header('Location: ' . $location);
+        exit();
+    }
+
+    /**
+     * get an id unique for this instance
+     *
+     * @return string
+     */
+    public static function getInstanceId() {
+        $id = \OC::$server->getSystemConfig()->getValue('instanceid', null);
+        if (is_null($id)) {
+            // We need to guarantee at least one letter in instanceid so it can be used as the session_name
+            $id = 'oc' . \OC::$server->getSecureRandom()->generate(10, \OCP\Security\ISecureRandom::CHAR_LOWER.\OCP\Security\ISecureRandom::CHAR_DIGITS);
+            \OC::$server->getSystemConfig()->setValue('instanceid', $id);
+        }
+        return $id;
+    }
+
+    /**
+     * Public function to sanitize HTML
+     *
+     * This function is used to sanitize HTML and should be applied on any
+     * string or array of strings before displaying it on a web page.
+     *
+     * @param string|array $value
+     * @return string|array an array of sanitized strings or a single sanitized string, depends on the input parameter.
+     */
+    public static function sanitizeHTML($value) {
+        if (is_array($value)) {
+            $value = array_map(function($value) {
+                return self::sanitizeHTML($value);
+            }, $value);
+        } else {
+            // Specify encoding for PHP<5.4
+            $value = htmlspecialchars((string)$value, ENT_QUOTES, 'UTF-8');
+        }
+        return $value;
+    }
+
+    /**
+     * Public function to encode url parameters
+     *
+     * This function is used to encode path to file before output.
+     * Encoding is done according to RFC 3986 with one exception:
+     * Character '/' is preserved as is.
+     *
+     * @param string $component part of URI to encode
+     * @return string
+     */
+    public static function encodePath($component) {
+        $encoded = rawurlencode($component);
+        $encoded = str_replace('%2F', '/', $encoded);
+        return $encoded;
+    }
+
+
+    public function createHtaccessTestFile(\OCP\IConfig $config) {
+        // php dev server does not support htaccess
+        if (php_sapi_name() === 'cli-server') {
+            return false;
+        }
+
+        // testdata
+        $fileName = '/htaccesstest.txt';
+        $testContent = 'This is used for testing whether htaccess is properly enabled to disallow access from the outside. This file can be safely removed.';
+
+        // creating a test file
+        $testFile = $config->getSystemValue('datadirectory', OC::$SERVERROOT . '/data') . '/' . $fileName;
+
+        if (file_exists($testFile)) {// already running this test, possible recursive call
+            return false;
+        }
+
+        $fp = @fopen($testFile, 'w');
+        if (!$fp) {
+            throw new OC\HintException('Can\'t create test file to check for working .htaccess file.',
+                'Make sure it is possible for the webserver to write to ' . $testFile);
+        }
+        fwrite($fp, $testContent);
+        fclose($fp);
+
+        return $testContent;
+    }
+
+    /**
+     * Check if the .htaccess file is working
+     * @param \OCP\IConfig $config
+     * @return bool
+     * @throws Exception
+     * @throws \OC\HintException If the test file can't get written.
+     */
+    public function isHtaccessWorking(\OCP\IConfig $config) {
+
+        if (\OC::$CLI || !$config->getSystemValue('check_for_working_htaccess', true)) {
+            return true;
+        }
+
+        $testContent = $this->createHtaccessTestFile($config);
+        if ($testContent === false) {
+            return false;
+        }
+
+        $fileName = '/htaccesstest.txt';
+        $testFile = $config->getSystemValue('datadirectory', OC::$SERVERROOT . '/data') . '/' . $fileName;
+
+        // accessing the file via http
+        $url = \OC::$server->getURLGenerator()->getAbsoluteURL(OC::$WEBROOT . '/data' . $fileName);
+        try {
+            $content = \OC::$server->getHTTPClientService()->newClient()->get($url)->getBody();
+        } catch (\Exception $e) {
+            $content = false;
+        }
+
+        if (strpos($url, 'https:') === 0) {
+            $url = 'http:' . substr($url, 6);
+        } else {
+            $url = 'https:' . substr($url, 5);
+        }
+
+        try {
+            $fallbackContent = \OC::$server->getHTTPClientService()->newClient()->get($url)->getBody();
+        } catch (\Exception $e) {
+            $fallbackContent = false;
+        }
+
+        // cleanup
+        @unlink($testFile);
+
+        /*
 		 * If the content is not equal to test content our .htaccess
 		 * is working as required
 		 */
-		return $content !== $testContent && $fallbackContent !== $testContent;
-	}
-
-	/**
-	 * Check if the setlocal call does not work. This can happen if the right
-	 * local packages are not available on the server.
-	 *
-	 * @return bool
-	 */
-	public static function isSetLocaleWorking() {
-		\Patchwork\Utf8\Bootup::initLocale();
-		if ('' === basename('§')) {
-			return false;
-		}
-		return true;
-	}
-
-	/**
-	 * Check if it's possible to get the inline annotations
-	 *
-	 * @return bool
-	 */
-	public static function isAnnotationsWorking() {
-		$reflection = new \ReflectionMethod(__METHOD__);
-		$docs = $reflection->getDocComment();
-
-		return (is_string($docs) && strlen($docs) > 50);
-	}
-
-	/**
-	 * Check if the PHP module fileinfo is loaded.
-	 *
-	 * @return bool
-	 */
-	public static function fileInfoLoaded() {
-		return function_exists('finfo_open');
-	}
-
-	/**
-	 * clear all levels of output buffering
-	 *
-	 * @return void
-	 */
-	public static function obEnd() {
-		while (ob_get_level()) {
-			ob_end_clean();
-		}
-	}
-
-	/**
-	 * Checks whether the server is running on Mac OS X
-	 *
-	 * @return bool true if running on Mac OS X, false otherwise
-	 */
-	public static function runningOnMac() {
-		return (strtoupper(substr(PHP_OS, 0, 6)) === 'DARWIN');
-	}
-
-	/**
-	 * Handles the case that there may not be a theme, then check if a "default"
-	 * theme exists and take that one
-	 *
-	 * @return string the theme
-	 */
-	public static function getTheme() {
-		$theme = \OC::$server->getSystemConfig()->getValue("theme", '');
-
-		if ($theme === '') {
-			if (is_dir(OC::$SERVERROOT . '/themes/default')) {
-				$theme = 'default';
-			}
-		}
-
-		return $theme;
-	}
-
-	/**
-	 * Normalize a unicode string
-	 *
-	 * @param string $value a not normalized string
-	 * @return bool|string
-	 */
-	public static function normalizeUnicode($value) {
-		if(Normalizer::isNormalized($value)) {
-			return $value;
-		}
-
-		$normalizedValue = Normalizer::normalize($value);
-		if ($normalizedValue === null || $normalizedValue === false) {
-			\OC::$server->getLogger()->warning('normalizing failed for "' . $value . '"', ['app' => 'core']);
-			return $value;
-		}
-
-		return $normalizedValue;
-	}
-
-	/**
-	 * A human readable string is generated based on version and build number
-	 *
-	 * @return string
-	 */
-	public static function getHumanVersion() {
-		$version = OC_Util::getVersionString();
-		$build = OC_Util::getBuild();
-		if (!empty($build) and OC_Util::getChannel() === 'daily') {
-			$version .= ' Build:' . $build;
-		}
-		return $version;
-	}
-
-	/**
-	 * Returns whether the given file name is valid
-	 *
-	 * @param string $file file name to check
-	 * @return bool true if the file name is valid, false otherwise
-	 * @deprecated use \OC\Files\View::verifyPath()
-	 */
-	public static function isValidFileName($file) {
-		$trimmed = trim($file);
-		if ($trimmed === '') {
-			return false;
-		}
-		if (\OC\Files\Filesystem::isIgnoredDir($trimmed)) {
-			return false;
-		}
-
-		// detect part files
-		if (preg_match('/' . \OCP\Files\FileInfo::BLACKLIST_FILES_REGEX . '/', $trimmed) !== 0) {
-			return false;
-		}
-
-		foreach (str_split($trimmed) as $char) {
-			if (strpos(\OCP\Constants::FILENAME_INVALID_CHARS, $char) !== false) {
-				return false;
-			}
-		}
-		return true;
-	}
-
-	/**
-	 * Check whether the instance needs to perform an upgrade,
-	 * either when the core version is higher or any app requires
-	 * an upgrade.
-	 *
-	 * @param \OC\SystemConfig $config
-	 * @return bool whether the core or any app needs an upgrade
-	 * @throws \OC\HintException When the upgrade from the given version is not allowed
-	 */
-	public static function needUpgrade(\OC\SystemConfig $config) {
-		if ($config->getValue('installed', false)) {
-			$installedVersion = $config->getValue('version', '0.0.0');
-			$currentVersion = implode('.', \OCP\Util::getVersion());
-			$versionDiff = version_compare($currentVersion, $installedVersion);
-			if ($versionDiff > 0) {
-				return true;
-			} else if ($config->getValue('debug', false) && $versionDiff < 0) {
-				// downgrade with debug
-				$installedMajor = explode('.', $installedVersion);
-				$installedMajor = $installedMajor[0] . '.' . $installedMajor[1];
-				$currentMajor = explode('.', $currentVersion);
-				$currentMajor = $currentMajor[0] . '.' . $currentMajor[1];
-				if ($installedMajor === $currentMajor) {
-					// Same major, allow downgrade for developers
-					return true;
-				} else {
-					// downgrade attempt, throw exception
-					throw new \OC\HintException('Downgrading is not supported and is likely to cause unpredictable issues (from ' . $installedVersion . ' to ' . $currentVersion . ')');
-				}
-			} else if ($versionDiff < 0) {
-				// downgrade attempt, throw exception
-				throw new \OC\HintException('Downgrading is not supported and is likely to cause unpredictable issues (from ' . $installedVersion . ' to ' . $currentVersion . ')');
-			}
-
-			// also check for upgrades for apps (independently from the user)
-			$apps = \OC_App::getEnabledApps(false, true);
-			$shouldUpgrade = false;
-			foreach ($apps as $app) {
-				if (\OC_App::shouldUpgrade($app)) {
-					$shouldUpgrade = true;
-					break;
-				}
-			}
-			return $shouldUpgrade;
-		} else {
-			return false;
-		}
-	}
-
-	/**
-	 * is this Internet explorer ?
-	 *
-	 * @return boolean
-	 */
-	public static function isIe() {
-		if (!isset($_SERVER['HTTP_USER_AGENT'])) {
-			return false;
-		}
-
-		return preg_match(Request::USER_AGENT_IE, $_SERVER['HTTP_USER_AGENT']) === 1;
-	}
+        return $content !== $testContent && $fallbackContent !== $testContent;
+    }
+
+    /**
+     * Check if the setlocal call does not work. This can happen if the right
+     * local packages are not available on the server.
+     *
+     * @return bool
+     */
+    public static function isSetLocaleWorking() {
+        \Patchwork\Utf8\Bootup::initLocale();
+        if ('' === basename('§')) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Check if it's possible to get the inline annotations
+     *
+     * @return bool
+     */
+    public static function isAnnotationsWorking() {
+        $reflection = new \ReflectionMethod(__METHOD__);
+        $docs = $reflection->getDocComment();
+
+        return (is_string($docs) && strlen($docs) > 50);
+    }
+
+    /**
+     * Check if the PHP module fileinfo is loaded.
+     *
+     * @return bool
+     */
+    public static function fileInfoLoaded() {
+        return function_exists('finfo_open');
+    }
+
+    /**
+     * clear all levels of output buffering
+     *
+     * @return void
+     */
+    public static function obEnd() {
+        while (ob_get_level()) {
+            ob_end_clean();
+        }
+    }
+
+    /**
+     * Checks whether the server is running on Mac OS X
+     *
+     * @return bool true if running on Mac OS X, false otherwise
+     */
+    public static function runningOnMac() {
+        return (strtoupper(substr(PHP_OS, 0, 6)) === 'DARWIN');
+    }
+
+    /**
+     * Handles the case that there may not be a theme, then check if a "default"
+     * theme exists and take that one
+     *
+     * @return string the theme
+     */
+    public static function getTheme() {
+        $theme = \OC::$server->getSystemConfig()->getValue("theme", '');
+
+        if ($theme === '') {
+            if (is_dir(OC::$SERVERROOT . '/themes/default')) {
+                $theme = 'default';
+            }
+        }
+
+        return $theme;
+    }
+
+    /**
+     * Normalize a unicode string
+     *
+     * @param string $value a not normalized string
+     * @return bool|string
+     */
+    public static function normalizeUnicode($value) {
+        if(Normalizer::isNormalized($value)) {
+            return $value;
+        }
+
+        $normalizedValue = Normalizer::normalize($value);
+        if ($normalizedValue === null || $normalizedValue === false) {
+            \OC::$server->getLogger()->warning('normalizing failed for "' . $value . '"', ['app' => 'core']);
+            return $value;
+        }
+
+        return $normalizedValue;
+    }
+
+    /**
+     * A human readable string is generated based on version and build number
+     *
+     * @return string
+     */
+    public static function getHumanVersion() {
+        $version = OC_Util::getVersionString();
+        $build = OC_Util::getBuild();
+        if (!empty($build) and OC_Util::getChannel() === 'daily') {
+            $version .= ' Build:' . $build;
+        }
+        return $version;
+    }
+
+    /**
+     * Returns whether the given file name is valid
+     *
+     * @param string $file file name to check
+     * @return bool true if the file name is valid, false otherwise
+     * @deprecated use \OC\Files\View::verifyPath()
+     */
+    public static function isValidFileName($file) {
+        $trimmed = trim($file);
+        if ($trimmed === '') {
+            return false;
+        }
+        if (\OC\Files\Filesystem::isIgnoredDir($trimmed)) {
+            return false;
+        }
+
+        // detect part files
+        if (preg_match('/' . \OCP\Files\FileInfo::BLACKLIST_FILES_REGEX . '/', $trimmed) !== 0) {
+            return false;
+        }
+
+        foreach (str_split($trimmed) as $char) {
+            if (strpos(\OCP\Constants::FILENAME_INVALID_CHARS, $char) !== false) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Check whether the instance needs to perform an upgrade,
+     * either when the core version is higher or any app requires
+     * an upgrade.
+     *
+     * @param \OC\SystemConfig $config
+     * @return bool whether the core or any app needs an upgrade
+     * @throws \OC\HintException When the upgrade from the given version is not allowed
+     */
+    public static function needUpgrade(\OC\SystemConfig $config) {
+        if ($config->getValue('installed', false)) {
+            $installedVersion = $config->getValue('version', '0.0.0');
+            $currentVersion = implode('.', \OCP\Util::getVersion());
+            $versionDiff = version_compare($currentVersion, $installedVersion);
+            if ($versionDiff > 0) {
+                return true;
+            } else if ($config->getValue('debug', false) && $versionDiff < 0) {
+                // downgrade with debug
+                $installedMajor = explode('.', $installedVersion);
+                $installedMajor = $installedMajor[0] . '.' . $installedMajor[1];
+                $currentMajor = explode('.', $currentVersion);
+                $currentMajor = $currentMajor[0] . '.' . $currentMajor[1];
+                if ($installedMajor === $currentMajor) {
+                    // Same major, allow downgrade for developers
+                    return true;
+                } else {
+                    // downgrade attempt, throw exception
+                    throw new \OC\HintException('Downgrading is not supported and is likely to cause unpredictable issues (from ' . $installedVersion . ' to ' . $currentVersion . ')');
+                }
+            } else if ($versionDiff < 0) {
+                // downgrade attempt, throw exception
+                throw new \OC\HintException('Downgrading is not supported and is likely to cause unpredictable issues (from ' . $installedVersion . ' to ' . $currentVersion . ')');
+            }
+
+            // also check for upgrades for apps (independently from the user)
+            $apps = \OC_App::getEnabledApps(false, true);
+            $shouldUpgrade = false;
+            foreach ($apps as $app) {
+                if (\OC_App::shouldUpgrade($app)) {
+                    $shouldUpgrade = true;
+                    break;
+                }
+            }
+            return $shouldUpgrade;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * is this Internet explorer ?
+     *
+     * @return boolean
+     */
+    public static function isIe() {
+        if (!isset($_SERVER['HTTP_USER_AGENT'])) {
+            return false;
+        }
+
+        return preg_match(Request::USER_AGENT_IE, $_SERVER['HTTP_USER_AGENT']) === 1;
+    }
 
 }

lib/private/legacy/helper.php

Indentation +547 added lines, -547 removed lines

@@ -51,551 +51,551 @@
  * Collection of useful functions
  */
 class OC_Helper {
-	private static $templateManager;
-
-	/**
-	 * Make a human file size
-	 * @param int $bytes file size in bytes
-	 * @return string a human readable file size
-	 *
-	 * Makes 2048 to 2 kB.
-	 */
-	public static function humanFileSize($bytes) {
-		if ($bytes < 0) {
-			return "?";
-		}
-		if ($bytes < 1024) {
-			return "$bytes B";
-		}
-		$bytes = round($bytes / 1024, 0);
-		if ($bytes < 1024) {
-			return "$bytes KB";
-		}
-		$bytes = round($bytes / 1024, 1);
-		if ($bytes < 1024) {
-			return "$bytes MB";
-		}
-		$bytes = round($bytes / 1024, 1);
-		if ($bytes < 1024) {
-			return "$bytes GB";
-		}
-		$bytes = round($bytes / 1024, 1);
-		if ($bytes < 1024) {
-			return "$bytes TB";
-		}
-
-		$bytes = round($bytes / 1024, 1);
-		return "$bytes PB";
-	}
-
-	/**
-	 * Make a computer file size
-	 * @param string $str file size in human readable format
-	 * @return float|bool a file size in bytes
-	 *
-	 * Makes 2kB to 2048.
-	 *
-	 * Inspired by: http://www.php.net/manual/en/function.filesize.php#92418
-	 */
-	public static function computerFileSize($str) {
-		$str = strtolower($str);
-		if (is_numeric($str)) {
-			return (float)$str;
-		}
-
-		$bytes_array = [
-			'b' => 1,
-			'k' => 1024,
-			'kb' => 1024,
-			'mb' => 1024 * 1024,
-			'm' => 1024 * 1024,
-			'gb' => 1024 * 1024 * 1024,
-			'g' => 1024 * 1024 * 1024,
-			'tb' => 1024 * 1024 * 1024 * 1024,
-			't' => 1024 * 1024 * 1024 * 1024,
-			'pb' => 1024 * 1024 * 1024 * 1024 * 1024,
-			'p' => 1024 * 1024 * 1024 * 1024 * 1024,
-		];
-
-		$bytes = (float)$str;
-
-		if (preg_match('#([kmgtp]?b?)$#si', $str, $matches) && !empty($bytes_array[$matches[1]])) {
-			$bytes *= $bytes_array[$matches[1]];
-		} else {
-			return false;
-		}
-
-		$bytes = round($bytes);
-
-		return $bytes;
-	}
-
-	/**
-	 * Recursive copying of folders
-	 * @param string $src source folder
-	 * @param string $dest target folder
-	 *
-	 */
-	static function copyr($src, $dest) {
-		if (is_dir($src)) {
-			if (!is_dir($dest)) {
-				mkdir($dest);
-			}
-			$files = scandir($src);
-			foreach ($files as $file) {
-				if ($file != "." && $file != "..") {
-					self::copyr("$src/$file", "$dest/$file");
-				}
-			}
-		} elseif (file_exists($src) && !\OC\Files\Filesystem::isFileBlacklisted($src)) {
-			copy($src, $dest);
-		}
-	}
-
-	/**
-	 * Recursive deletion of folders
-	 * @param string $dir path to the folder
-	 * @param bool $deleteSelf if set to false only the content of the folder will be deleted
-	 * @return bool
-	 */
-	static function rmdirr($dir, $deleteSelf = true) {
-		if (is_dir($dir)) {
-			$files = new RecursiveIteratorIterator(
-				new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS),
-				RecursiveIteratorIterator::CHILD_FIRST
-			);
-
-			foreach ($files as $fileInfo) {
-				/** @var SplFileInfo $fileInfo */
-				if ($fileInfo->isLink()) {
-					unlink($fileInfo->getPathname());
-				} else if ($fileInfo->isDir()) {
-					rmdir($fileInfo->getRealPath());
-				} else {
-					unlink($fileInfo->getRealPath());
-				}
-			}
-			if ($deleteSelf) {
-				rmdir($dir);
-			}
-		} elseif (file_exists($dir)) {
-			if ($deleteSelf) {
-				unlink($dir);
-			}
-		}
-		if (!$deleteSelf) {
-			return true;
-		}
-
-		return !file_exists($dir);
-	}
-
-	/**
-	 * @deprecated 18.0.0
-	 * @return \OC\Files\Type\TemplateManager
-	 */
-	static public function getFileTemplateManager() {
-		if (!self::$templateManager) {
-			self::$templateManager = new \OC\Files\Type\TemplateManager();
-		}
-		return self::$templateManager;
-	}
-
-	/**
-	 * detect if a given program is found in the search PATH
-	 *
-	 * @param string $name
-	 * @param bool $path
-	 * @internal param string $program name
-	 * @internal param string $optional search path, defaults to $PATH
-	 * @return bool    true if executable program found in path
-	 */
-	public static function canExecute($name, $path = false) {
-		// path defaults to PATH from environment if not set
-		if ($path === false) {
-			$path = getenv("PATH");
-		}
-		// we look for an executable file of that name
-		$exts = [""];
-		$check_fn = "is_executable";
-		// Default check will be done with $path directories :
-		$dirs = explode(PATH_SEPARATOR, $path);
-		// WARNING : We have to check if open_basedir is enabled :
-		$obd = OC::$server->getIniWrapper()->getString('open_basedir');
-		if ($obd != "none") {
-			$obd_values = explode(PATH_SEPARATOR, $obd);
-			if (count($obd_values) > 0 and $obd_values[0]) {
-				// open_basedir is in effect !
-				// We need to check if the program is in one of these dirs :
-				$dirs = $obd_values;
-			}
-		}
-		foreach ($dirs as $dir) {
-			foreach ($exts as $ext) {
-				if ($check_fn("$dir/$name" . $ext))
-					return true;
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * copy the contents of one stream to another
-	 *
-	 * @param resource $source
-	 * @param resource $target
-	 * @return array the number of bytes copied and result
-	 */
-	public static function streamCopy($source, $target) {
-		if (!$source or !$target) {
-			return [0, false];
-		}
-		$bufSize = 8192;
-		$result = true;
-		$count = 0;
-		while (!feof($source)) {
-			$buf = fread($source, $bufSize);
-			$bytesWritten = fwrite($target, $buf);
-			if ($bytesWritten !== false) {
-				$count += $bytesWritten;
-			}
-			// note: strlen is expensive so only use it when necessary,
-			// on the last block
-			if ($bytesWritten === false
-				|| ($bytesWritten < $bufSize && $bytesWritten < strlen($buf))
-			) {
-				// write error, could be disk full ?
-				$result = false;
-				break;
-			}
-		}
-		return [$count, $result];
-	}
-
-	/**
-	 * Adds a suffix to the name in case the file exists
-	 *
-	 * @param string $path
-	 * @param string $filename
-	 * @return string
-	 */
-	public static function buildNotExistingFileName($path, $filename) {
-		$view = \OC\Files\Filesystem::getView();
-		return self::buildNotExistingFileNameForView($path, $filename, $view);
-	}
-
-	/**
-	 * Adds a suffix to the name in case the file exists
-	 *
-	 * @param string $path
-	 * @param string $filename
-	 * @return string
-	 */
-	public static function buildNotExistingFileNameForView($path, $filename, \OC\Files\View $view) {
-		if ($path === '/') {
-			$path = '';
-		}
-		if ($pos = strrpos($filename, '.')) {
-			$name = substr($filename, 0, $pos);
-			$ext = substr($filename, $pos);
-		} else {
-			$name = $filename;
-			$ext = '';
-		}
-
-		$newpath = $path . '/' . $filename;
-		if ($view->file_exists($newpath)) {
-			if (preg_match_all('/\((\d+)\)/', $name, $matches, PREG_OFFSET_CAPTURE)) {
-				//Replace the last "(number)" with "(number+1)"
-				$last_match = count($matches[0]) - 1;
-				$counter = $matches[1][$last_match][0] + 1;
-				$offset = $matches[0][$last_match][1];
-				$match_length = strlen($matches[0][$last_match][0]);
-			} else {
-				$counter = 2;
-				$match_length = 0;
-				$offset = false;
-			}
-			do {
-				if ($offset) {
-					//Replace the last "(number)" with "(number+1)"
-					$newname = substr_replace($name, '(' . $counter . ')', $offset, $match_length);
-				} else {
-					$newname = $name . ' (' . $counter . ')';
-				}
-				$newpath = $path . '/' . $newname . $ext;
-				$counter++;
-			} while ($view->file_exists($newpath));
-		}
-
-		return $newpath;
-	}
-
-	/**
-	 * Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.
-	 *
-	 * @param array $input The array to work on
-	 * @param int $case Either MB_CASE_UPPER or MB_CASE_LOWER (default)
-	 * @param string $encoding The encoding parameter is the character encoding. Defaults to UTF-8
-	 * @return array
-	 *
-	 * Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.
-	 * based on http://www.php.net/manual/en/function.array-change-key-case.php#107715
-	 *
-	 */
-	public static function mb_array_change_key_case($input, $case = MB_CASE_LOWER, $encoding = 'UTF-8') {
-		$case = ($case != MB_CASE_UPPER) ? MB_CASE_LOWER : MB_CASE_UPPER;
-		$ret = [];
-		foreach ($input as $k => $v) {
-			$ret[mb_convert_case($k, $case, $encoding)] = $v;
-		}
-		return $ret;
-	}
-
-	/**
-	 * performs a search in a nested array
-	 * @param array $haystack the array to be searched
-	 * @param string $needle the search string
-	 * @param mixed $index optional, only search this key name
-	 * @return mixed the key of the matching field, otherwise false
-	 *
-	 * performs a search in a nested array
-	 *
-	 * taken from http://www.php.net/manual/en/function.array-search.php#97645
-	 */
-	public static function recursiveArraySearch($haystack, $needle, $index = null) {
-		$aIt = new RecursiveArrayIterator($haystack);
-		$it = new RecursiveIteratorIterator($aIt);
-
-		while ($it->valid()) {
-			if (((isset($index) AND ($it->key() == $index)) OR !isset($index)) AND ($it->current() == $needle)) {
-				return $aIt->key();
-			}
-
-			$it->next();
-		}
-
-		return false;
-	}
-
-	/**
-	 * calculates the maximum upload size respecting system settings, free space and user quota
-	 *
-	 * @param string $dir the current folder where the user currently operates
-	 * @param int $freeSpace the number of bytes free on the storage holding $dir, if not set this will be received from the storage directly
-	 * @return int number of bytes representing
-	 */
-	public static function maxUploadFilesize($dir, $freeSpace = null) {
-		if (is_null($freeSpace) || $freeSpace < 0){
-			$freeSpace = self::freeSpace($dir);
-		}
-		return min($freeSpace, self::uploadLimit());
-	}
-
-	/**
-	 * Calculate free space left within user quota
-	 *
-	 * @param string $dir the current folder where the user currently operates
-	 * @return int number of bytes representing
-	 */
-	public static function freeSpace($dir) {
-		$freeSpace = \OC\Files\Filesystem::free_space($dir);
-		if ($freeSpace < \OCP\Files\FileInfo::SPACE_UNLIMITED) {
-			$freeSpace = max($freeSpace, 0);
-			return $freeSpace;
-		} else {
-			return (INF > 0)? INF: PHP_INT_MAX; // work around https://bugs.php.net/bug.php?id=69188
-		}
-	}
-
-	/**
-	 * Calculate PHP upload limit
-	 *
-	 * @return int PHP upload file size limit
-	 */
-	public static function uploadLimit() {
-		$ini = \OC::$server->getIniWrapper();
-		$upload_max_filesize = OCP\Util::computerFileSize($ini->get('upload_max_filesize'));
-		$post_max_size = OCP\Util::computerFileSize($ini->get('post_max_size'));
-		if ((int)$upload_max_filesize === 0 and (int)$post_max_size === 0) {
-			return INF;
-		} elseif ((int)$upload_max_filesize === 0 or (int)$post_max_size === 0) {
-			return max($upload_max_filesize, $post_max_size); //only the non 0 value counts
-		} else {
-			return min($upload_max_filesize, $post_max_size);
-		}
-	}
-
-	/**
-	 * Checks if a function is available
-	 *
-	 * @param string $function_name
-	 * @return bool
-	 */
-	public static function is_function_enabled($function_name) {
-		if (!function_exists($function_name)) {
-			return false;
-		}
-		$ini = \OC::$server->getIniWrapper();
-		$disabled = explode(',', $ini->get('disable_functions') ?: '');
-		$disabled = array_map('trim', $disabled);
-		if (in_array($function_name, $disabled)) {
-			return false;
-		}
-		$disabled = explode(',', $ini->get('suhosin.executor.func.blacklist') ?: '');
-		$disabled = array_map('trim', $disabled);
-		if (in_array($function_name, $disabled)) {
-			return false;
-		}
-		return true;
-	}
-
-	/**
-	 * Try to find a program
-	 *
-	 * @param string $program
-	 * @return null|string
-	 */
-	public static function findBinaryPath($program) {
-		$memcache = \OC::$server->getMemCacheFactory()->createDistributed('findBinaryPath');
-		if ($memcache->hasKey($program)) {
-			return $memcache->get($program);
-		}
-		$result = null;
-		if (self::is_function_enabled('exec')) {
-			$exeSniffer = new ExecutableFinder();
-			// Returns null if nothing is found
-			$result = $exeSniffer->find($program, null, ['/usr/local/sbin', '/usr/local/bin', '/usr/sbin', '/usr/bin', '/sbin', '/bin', '/opt/bin']);
-		}
-		// store the value for 5 minutes
-		$memcache->set($program, $result, 300);
-		return $result;
-	}
-
-	/**
-	 * Calculate the disc space for the given path
-	 *
-	 * @param string $path
-	 * @param \OCP\Files\FileInfo $rootInfo (optional)
-	 * @return array
-	 * @throws \OCP\Files\NotFoundException
-	 */
-	public static function getStorageInfo($path, $rootInfo = null) {
-		// return storage info without adding mount points
-		$includeExtStorage = \OC::$server->getSystemConfig()->getValue('quota_include_external_storage', false);
-
-		if (!$rootInfo) {
-			$rootInfo = \OC\Files\Filesystem::getFileInfo($path, $includeExtStorage ? 'ext' : false);
-		}
-		if (!$rootInfo instanceof \OCP\Files\FileInfo) {
-			throw new \OCP\Files\NotFoundException();
-		}
-		$used = $rootInfo->getSize();
-		if ($used < 0) {
-			$used = 0;
-		}
-		$quota = \OCP\Files\FileInfo::SPACE_UNLIMITED;
-		$storage = $rootInfo->getStorage();
-		$sourceStorage = $storage;
-		if ($storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage')) {
-			$includeExtStorage = false;
-			$sourceStorage = $storage->getSourceStorage();
-		}
-		if ($includeExtStorage) {
-			if ($storage->instanceOfStorage('\OC\Files\Storage\Home')
-				|| $storage->instanceOfStorage('\OC\Files\ObjectStore\HomeObjectStoreStorage')
-			) {
-				/** @var \OC\Files\Storage\Home $storage */
-				$user = $storage->getUser();
-			} else {
-				$user = \OC::$server->getUserSession()->getUser();
-			}
-			$quota = OC_Util::getUserQuota($user);
-			if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
-				// always get free space / total space from root + mount points
-				return self::getGlobalStorageInfo($quota);
-			}
-		}
-
-		// TODO: need a better way to get total space from storage
-		if ($sourceStorage->instanceOfStorage('\OC\Files\Storage\Wrapper\Quota')) {
-			/** @var \OC\Files\Storage\Wrapper\Quota $storage */
-			$quota = $sourceStorage->getQuota();
-		}
-		$free = $sourceStorage->free_space($rootInfo->getInternalPath());
-		if ($free >= 0) {
-			$total = $free + $used;
-		} else {
-			$total = $free; //either unknown or unlimited
-		}
-		if ($total > 0) {
-			if ($quota > 0 && $total > $quota) {
-				$total = $quota;
-			}
-			// prevent division by zero or error codes (negative values)
-			$relative = round(($used / $total) * 10000) / 100;
-		} else {
-			$relative = 0;
-		}
-
-		$ownerId = $storage->getOwner($path);
-		$ownerDisplayName = '';
-		$owner = \OC::$server->getUserManager()->get($ownerId);
-		if($owner) {
-			$ownerDisplayName = $owner->getDisplayName();
-		}
-
-		return [
-			'free' => $free,
-			'used' => $used,
-			'quota' => $quota,
-			'total' => $total,
-			'relative' => $relative,
-			'owner' => $ownerId,
-			'ownerDisplayName' => $ownerDisplayName,
-		];
-	}
-
-	/**
-	 * Get storage info including all mount points and quota
-	 *
-	 * @param int $quota
-	 * @return array
-	 */
-	private static function getGlobalStorageInfo($quota) {
-		$rootInfo = \OC\Files\Filesystem::getFileInfo('', 'ext');
-		$used = $rootInfo['size'];
-		if ($used < 0) {
-			$used = 0;
-		}
-
-		$total = $quota;
-		$free = $quota - $used;
-
-		if ($total > 0) {
-			if ($quota > 0 && $total > $quota) {
-				$total = $quota;
-			}
-			// prevent division by zero or error codes (negative values)
-			$relative = round(($used / $total) * 10000) / 100;
-		} else {
-			$relative = 0;
-		}
-
-		return [
-			'free' => $free,
-			'used' => $used,
-			'total' => $total,
-			'relative' => $relative,
-			'quota' => $quota
-		];
-	}
-
-	/**
-	 * Returns whether the config file is set manually to read-only
-	 * @return bool
-	 */
-	public static function isReadOnlyConfigEnabled() {
-		return \OC::$server->getConfig()->getSystemValue('config_is_read_only', false);
-	}
+    private static $templateManager;
+
+    /**
+     * Make a human file size
+     * @param int $bytes file size in bytes
+     * @return string a human readable file size
+     *
+     * Makes 2048 to 2 kB.
+     */
+    public static function humanFileSize($bytes) {
+        if ($bytes < 0) {
+            return "?";
+        }
+        if ($bytes < 1024) {
+            return "$bytes B";
+        }
+        $bytes = round($bytes / 1024, 0);
+        if ($bytes < 1024) {
+            return "$bytes KB";
+        }
+        $bytes = round($bytes / 1024, 1);
+        if ($bytes < 1024) {
+            return "$bytes MB";
+        }
+        $bytes = round($bytes / 1024, 1);
+        if ($bytes < 1024) {
+            return "$bytes GB";
+        }
+        $bytes = round($bytes / 1024, 1);
+        if ($bytes < 1024) {
+            return "$bytes TB";
+        }
+
+        $bytes = round($bytes / 1024, 1);
+        return "$bytes PB";
+    }
+
+    /**
+     * Make a computer file size
+     * @param string $str file size in human readable format
+     * @return float|bool a file size in bytes
+     *
+     * Makes 2kB to 2048.
+     *
+     * Inspired by: http://www.php.net/manual/en/function.filesize.php#92418
+     */
+    public static function computerFileSize($str) {
+        $str = strtolower($str);
+        if (is_numeric($str)) {
+            return (float)$str;
+        }
+
+        $bytes_array = [
+            'b' => 1,
+            'k' => 1024,
+            'kb' => 1024,
+            'mb' => 1024 * 1024,
+            'm' => 1024 * 1024,
+            'gb' => 1024 * 1024 * 1024,
+            'g' => 1024 * 1024 * 1024,
+            'tb' => 1024 * 1024 * 1024 * 1024,
+            't' => 1024 * 1024 * 1024 * 1024,
+            'pb' => 1024 * 1024 * 1024 * 1024 * 1024,
+            'p' => 1024 * 1024 * 1024 * 1024 * 1024,
+        ];
+
+        $bytes = (float)$str;
+
+        if (preg_match('#([kmgtp]?b?)$#si', $str, $matches) && !empty($bytes_array[$matches[1]])) {
+            $bytes *= $bytes_array[$matches[1]];
+        } else {
+            return false;
+        }
+
+        $bytes = round($bytes);
+
+        return $bytes;
+    }
+
+    /**
+     * Recursive copying of folders
+     * @param string $src source folder
+     * @param string $dest target folder
+     *
+     */
+    static function copyr($src, $dest) {
+        if (is_dir($src)) {
+            if (!is_dir($dest)) {
+                mkdir($dest);
+            }
+            $files = scandir($src);
+            foreach ($files as $file) {
+                if ($file != "." && $file != "..") {
+                    self::copyr("$src/$file", "$dest/$file");
+                }
+            }
+        } elseif (file_exists($src) && !\OC\Files\Filesystem::isFileBlacklisted($src)) {
+            copy($src, $dest);
+        }
+    }
+
+    /**
+     * Recursive deletion of folders
+     * @param string $dir path to the folder
+     * @param bool $deleteSelf if set to false only the content of the folder will be deleted
+     * @return bool
+     */
+    static function rmdirr($dir, $deleteSelf = true) {
+        if (is_dir($dir)) {
+            $files = new RecursiveIteratorIterator(
+                new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS),
+                RecursiveIteratorIterator::CHILD_FIRST
+            );
+
+            foreach ($files as $fileInfo) {
+                /** @var SplFileInfo $fileInfo */
+                if ($fileInfo->isLink()) {
+                    unlink($fileInfo->getPathname());
+                } else if ($fileInfo->isDir()) {
+                    rmdir($fileInfo->getRealPath());
+                } else {
+                    unlink($fileInfo->getRealPath());
+                }
+            }
+            if ($deleteSelf) {
+                rmdir($dir);
+            }
+        } elseif (file_exists($dir)) {
+            if ($deleteSelf) {
+                unlink($dir);
+            }
+        }
+        if (!$deleteSelf) {
+            return true;
+        }
+
+        return !file_exists($dir);
+    }
+
+    /**
+     * @deprecated 18.0.0
+     * @return \OC\Files\Type\TemplateManager
+     */
+    static public function getFileTemplateManager() {
+        if (!self::$templateManager) {
+            self::$templateManager = new \OC\Files\Type\TemplateManager();
+        }
+        return self::$templateManager;
+    }
+
+    /**
+     * detect if a given program is found in the search PATH
+     *
+     * @param string $name
+     * @param bool $path
+     * @internal param string $program name
+     * @internal param string $optional search path, defaults to $PATH
+     * @return bool    true if executable program found in path
+     */
+    public static function canExecute($name, $path = false) {
+        // path defaults to PATH from environment if not set
+        if ($path === false) {
+            $path = getenv("PATH");
+        }
+        // we look for an executable file of that name
+        $exts = [""];
+        $check_fn = "is_executable";
+        // Default check will be done with $path directories :
+        $dirs = explode(PATH_SEPARATOR, $path);
+        // WARNING : We have to check if open_basedir is enabled :
+        $obd = OC::$server->getIniWrapper()->getString('open_basedir');
+        if ($obd != "none") {
+            $obd_values = explode(PATH_SEPARATOR, $obd);
+            if (count($obd_values) > 0 and $obd_values[0]) {
+                // open_basedir is in effect !
+                // We need to check if the program is in one of these dirs :
+                $dirs = $obd_values;
+            }
+        }
+        foreach ($dirs as $dir) {
+            foreach ($exts as $ext) {
+                if ($check_fn("$dir/$name" . $ext))
+                    return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * copy the contents of one stream to another
+     *
+     * @param resource $source
+     * @param resource $target
+     * @return array the number of bytes copied and result
+     */
+    public static function streamCopy($source, $target) {
+        if (!$source or !$target) {
+            return [0, false];
+        }
+        $bufSize = 8192;
+        $result = true;
+        $count = 0;
+        while (!feof($source)) {
+            $buf = fread($source, $bufSize);
+            $bytesWritten = fwrite($target, $buf);
+            if ($bytesWritten !== false) {
+                $count += $bytesWritten;
+            }
+            // note: strlen is expensive so only use it when necessary,
+            // on the last block
+            if ($bytesWritten === false
+                || ($bytesWritten < $bufSize && $bytesWritten < strlen($buf))
+            ) {
+                // write error, could be disk full ?
+                $result = false;
+                break;
+            }
+        }
+        return [$count, $result];
+    }
+
+    /**
+     * Adds a suffix to the name in case the file exists
+     *
+     * @param string $path
+     * @param string $filename
+     * @return string
+     */
+    public static function buildNotExistingFileName($path, $filename) {
+        $view = \OC\Files\Filesystem::getView();
+        return self::buildNotExistingFileNameForView($path, $filename, $view);
+    }
+
+    /**
+     * Adds a suffix to the name in case the file exists
+     *
+     * @param string $path
+     * @param string $filename
+     * @return string
+     */
+    public static function buildNotExistingFileNameForView($path, $filename, \OC\Files\View $view) {
+        if ($path === '/') {
+            $path = '';
+        }
+        if ($pos = strrpos($filename, '.')) {
+            $name = substr($filename, 0, $pos);
+            $ext = substr($filename, $pos);
+        } else {
+            $name = $filename;
+            $ext = '';
+        }
+
+        $newpath = $path . '/' . $filename;
+        if ($view->file_exists($newpath)) {
+            if (preg_match_all('/\((\d+)\)/', $name, $matches, PREG_OFFSET_CAPTURE)) {
+                //Replace the last "(number)" with "(number+1)"
+                $last_match = count($matches[0]) - 1;
+                $counter = $matches[1][$last_match][0] + 1;
+                $offset = $matches[0][$last_match][1];
+                $match_length = strlen($matches[0][$last_match][0]);
+            } else {
+                $counter = 2;
+                $match_length = 0;
+                $offset = false;
+            }
+            do {
+                if ($offset) {
+                    //Replace the last "(number)" with "(number+1)"
+                    $newname = substr_replace($name, '(' . $counter . ')', $offset, $match_length);
+                } else {
+                    $newname = $name . ' (' . $counter . ')';
+                }
+                $newpath = $path . '/' . $newname . $ext;
+                $counter++;
+            } while ($view->file_exists($newpath));
+        }
+
+        return $newpath;
+    }
+
+    /**
+     * Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.
+     *
+     * @param array $input The array to work on
+     * @param int $case Either MB_CASE_UPPER or MB_CASE_LOWER (default)
+     * @param string $encoding The encoding parameter is the character encoding. Defaults to UTF-8
+     * @return array
+     *
+     * Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.
+     * based on http://www.php.net/manual/en/function.array-change-key-case.php#107715
+     *
+     */
+    public static function mb_array_change_key_case($input, $case = MB_CASE_LOWER, $encoding = 'UTF-8') {
+        $case = ($case != MB_CASE_UPPER) ? MB_CASE_LOWER : MB_CASE_UPPER;
+        $ret = [];
+        foreach ($input as $k => $v) {
+            $ret[mb_convert_case($k, $case, $encoding)] = $v;
+        }
+        return $ret;
+    }
+
+    /**
+     * performs a search in a nested array
+     * @param array $haystack the array to be searched
+     * @param string $needle the search string
+     * @param mixed $index optional, only search this key name
+     * @return mixed the key of the matching field, otherwise false
+     *
+     * performs a search in a nested array
+     *
+     * taken from http://www.php.net/manual/en/function.array-search.php#97645
+     */
+    public static function recursiveArraySearch($haystack, $needle, $index = null) {
+        $aIt = new RecursiveArrayIterator($haystack);
+        $it = new RecursiveIteratorIterator($aIt);
+
+        while ($it->valid()) {
+            if (((isset($index) AND ($it->key() == $index)) OR !isset($index)) AND ($it->current() == $needle)) {
+                return $aIt->key();
+            }
+
+            $it->next();
+        }
+
+        return false;
+    }
+
+    /**
+     * calculates the maximum upload size respecting system settings, free space and user quota
+     *
+     * @param string $dir the current folder where the user currently operates
+     * @param int $freeSpace the number of bytes free on the storage holding $dir, if not set this will be received from the storage directly
+     * @return int number of bytes representing
+     */
+    public static function maxUploadFilesize($dir, $freeSpace = null) {
+        if (is_null($freeSpace) || $freeSpace < 0){
+            $freeSpace = self::freeSpace($dir);
+        }
+        return min($freeSpace, self::uploadLimit());
+    }
+
+    /**
+     * Calculate free space left within user quota
+     *
+     * @param string $dir the current folder where the user currently operates
+     * @return int number of bytes representing
+     */
+    public static function freeSpace($dir) {
+        $freeSpace = \OC\Files\Filesystem::free_space($dir);
+        if ($freeSpace < \OCP\Files\FileInfo::SPACE_UNLIMITED) {
+            $freeSpace = max($freeSpace, 0);
+            return $freeSpace;
+        } else {
+            return (INF > 0)? INF: PHP_INT_MAX; // work around https://bugs.php.net/bug.php?id=69188
+        }
+    }
+
+    /**
+     * Calculate PHP upload limit
+     *
+     * @return int PHP upload file size limit
+     */
+    public static function uploadLimit() {
+        $ini = \OC::$server->getIniWrapper();
+        $upload_max_filesize = OCP\Util::computerFileSize($ini->get('upload_max_filesize'));
+        $post_max_size = OCP\Util::computerFileSize($ini->get('post_max_size'));
+        if ((int)$upload_max_filesize === 0 and (int)$post_max_size === 0) {
+            return INF;
+        } elseif ((int)$upload_max_filesize === 0 or (int)$post_max_size === 0) {
+            return max($upload_max_filesize, $post_max_size); //only the non 0 value counts
+        } else {
+            return min($upload_max_filesize, $post_max_size);
+        }
+    }
+
+    /**
+     * Checks if a function is available
+     *
+     * @param string $function_name
+     * @return bool
+     */
+    public static function is_function_enabled($function_name) {
+        if (!function_exists($function_name)) {
+            return false;
+        }
+        $ini = \OC::$server->getIniWrapper();
+        $disabled = explode(',', $ini->get('disable_functions') ?: '');
+        $disabled = array_map('trim', $disabled);
+        if (in_array($function_name, $disabled)) {
+            return false;
+        }
+        $disabled = explode(',', $ini->get('suhosin.executor.func.blacklist') ?: '');
+        $disabled = array_map('trim', $disabled);
+        if (in_array($function_name, $disabled)) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Try to find a program
+     *
+     * @param string $program
+     * @return null|string
+     */
+    public static function findBinaryPath($program) {
+        $memcache = \OC::$server->getMemCacheFactory()->createDistributed('findBinaryPath');
+        if ($memcache->hasKey($program)) {
+            return $memcache->get($program);
+        }
+        $result = null;
+        if (self::is_function_enabled('exec')) {
+            $exeSniffer = new ExecutableFinder();
+            // Returns null if nothing is found
+            $result = $exeSniffer->find($program, null, ['/usr/local/sbin', '/usr/local/bin', '/usr/sbin', '/usr/bin', '/sbin', '/bin', '/opt/bin']);
+        }
+        // store the value for 5 minutes
+        $memcache->set($program, $result, 300);
+        return $result;
+    }
+
+    /**
+     * Calculate the disc space for the given path
+     *
+     * @param string $path
+     * @param \OCP\Files\FileInfo $rootInfo (optional)
+     * @return array
+     * @throws \OCP\Files\NotFoundException
+     */
+    public static function getStorageInfo($path, $rootInfo = null) {
+        // return storage info without adding mount points
+        $includeExtStorage = \OC::$server->getSystemConfig()->getValue('quota_include_external_storage', false);
+
+        if (!$rootInfo) {
+            $rootInfo = \OC\Files\Filesystem::getFileInfo($path, $includeExtStorage ? 'ext' : false);
+        }
+        if (!$rootInfo instanceof \OCP\Files\FileInfo) {
+            throw new \OCP\Files\NotFoundException();
+        }
+        $used = $rootInfo->getSize();
+        if ($used < 0) {
+            $used = 0;
+        }
+        $quota = \OCP\Files\FileInfo::SPACE_UNLIMITED;
+        $storage = $rootInfo->getStorage();
+        $sourceStorage = $storage;
+        if ($storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage')) {
+            $includeExtStorage = false;
+            $sourceStorage = $storage->getSourceStorage();
+        }
+        if ($includeExtStorage) {
+            if ($storage->instanceOfStorage('\OC\Files\Storage\Home')
+                || $storage->instanceOfStorage('\OC\Files\ObjectStore\HomeObjectStoreStorage')
+            ) {
+                /** @var \OC\Files\Storage\Home $storage */
+                $user = $storage->getUser();
+            } else {
+                $user = \OC::$server->getUserSession()->getUser();
+            }
+            $quota = OC_Util::getUserQuota($user);
+            if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
+                // always get free space / total space from root + mount points
+                return self::getGlobalStorageInfo($quota);
+            }
+        }
+
+        // TODO: need a better way to get total space from storage
+        if ($sourceStorage->instanceOfStorage('\OC\Files\Storage\Wrapper\Quota')) {
+            /** @var \OC\Files\Storage\Wrapper\Quota $storage */
+            $quota = $sourceStorage->getQuota();
+        }
+        $free = $sourceStorage->free_space($rootInfo->getInternalPath());
+        if ($free >= 0) {
+            $total = $free + $used;
+        } else {
+            $total = $free; //either unknown or unlimited
+        }
+        if ($total > 0) {
+            if ($quota > 0 && $total > $quota) {
+                $total = $quota;
+            }
+            // prevent division by zero or error codes (negative values)
+            $relative = round(($used / $total) * 10000) / 100;
+        } else {
+            $relative = 0;
+        }
+
+        $ownerId = $storage->getOwner($path);
+        $ownerDisplayName = '';
+        $owner = \OC::$server->getUserManager()->get($ownerId);
+        if($owner) {
+            $ownerDisplayName = $owner->getDisplayName();
+        }
+
+        return [
+            'free' => $free,
+            'used' => $used,
+            'quota' => $quota,
+            'total' => $total,
+            'relative' => $relative,
+            'owner' => $ownerId,
+            'ownerDisplayName' => $ownerDisplayName,
+        ];
+    }
+
+    /**
+     * Get storage info including all mount points and quota
+     *
+     * @param int $quota
+     * @return array
+     */
+    private static function getGlobalStorageInfo($quota) {
+        $rootInfo = \OC\Files\Filesystem::getFileInfo('', 'ext');
+        $used = $rootInfo['size'];
+        if ($used < 0) {
+            $used = 0;
+        }
+
+        $total = $quota;
+        $free = $quota - $used;
+
+        if ($total > 0) {
+            if ($quota > 0 && $total > $quota) {
+                $total = $quota;
+            }
+            // prevent division by zero or error codes (negative values)
+            $relative = round(($used / $total) * 10000) / 100;
+        } else {
+            $relative = 0;
+        }
+
+        return [
+            'free' => $free,
+            'used' => $used,
+            'total' => $total,
+            'relative' => $relative,
+            'quota' => $quota
+        ];
+    }
+
+    /**
+     * Returns whether the config file is set manually to read-only
+     * @return bool
+     */
+    public static function isReadOnlyConfigEnabled() {
+        return \OC::$server->getConfig()->getSystemValue('config_is_read_only', false);
+    }
 }