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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Christopher Schäpers <kondou@ts.unde.re>
* @author Florin Peter <github@florin-peter.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Sam Tuke <mail@samtuke.com>
* @author Stephan Peijnik <speijnik@anexia-it.com>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/**
* Class for abstraction of filesystem functions
* This class won't call any filesystem functions for itself but will pass them to the correct OC_Filestorage object
* this class should also handle all the file permission related stuff
*
* Hooks provided:
* read(path)
* write(path, &run)
* post_write(path)
* create(path, &run) (when a file is created, both create and write will be emitted in that order)
* post_create(path)
* delete(path, &run)
* post_delete(path)
* rename(oldpath,newpath, &run)
* post_rename(oldpath,newpath)
* copy(oldpath,newpath, &run) (if the newpath doesn't exists yes, copy, create and write will be emitted in that order)
* post_rename(oldpath,newpath)
* post_initMountPoints(user, user_dir)
*
* the &run parameter can be set to false to prevent the operation from occurring
*/
namespace OC\Files;
use OC\Cache\CappedMemoryCache;
use OC\Files\Config\MountProviderCollection;
use OC\Files\Mount\MountPoint;
use OC\Files\Storage\StorageFactory;
use OC\Lockdown\Filesystem\NullStorage;
use OCP\Files\Config\IMountProvider;
use OCP\Files\NotFoundException;
use OCP\IUserManager;
class Filesystem {
/**
* @var Mount\Manager $mounts
*/
private static $mounts;
public static $loaded = false;
/**
* @var \OC\Files\View $defaultInstance
*/
static private $defaultInstance;
static private $usersSetup = array();
static private $normalizedPathCache = null;
static private $listeningForProviders = false;
/**
* classname which used for hooks handling
* used as signalclass in OC_Hooks::emit()
*/
const CLASSNAME = 'OC_Filesystem';
/**
* signalname emitted before file renaming
*
* @param string $oldpath
* @param string $newpath
*/
const signal_rename = 'rename';
/**
* signal emitted after file renaming
*
* @param string $oldpath
* @param string $newpath
*/
const signal_post_rename = 'post_rename';
/**
* signal emitted before file/dir creation
*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_create = 'create';
/**
* signal emitted after file/dir creation
*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_post_create = 'post_create';
/**
* signal emits before file/dir copy
*
* @param string $oldpath
* @param string $newpath
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_copy = 'copy';
/**
* signal emits after file/dir copy
*
* @param string $oldpath
* @param string $newpath
*/
const signal_post_copy = 'post_copy';
/**
* signal emits before file/dir save
*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_write = 'write';
/**
* signal emits after file/dir save
*
* @param string $path
*/
const signal_post_write = 'post_write';
/**
* signal emitted before file/dir update
*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_update = 'update';
/**
* signal emitted after file/dir update
*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
*/
const signal_post_update = 'post_update';
/**
* signal emits when reading file/dir
*
* @param string $path
*/
const signal_read = 'read';
/**
* signal emits when removing file/dir
*
* @param string $path
*/
const signal_delete = 'delete';
/**
* parameters definitions for signals
*/
const signal_param_path = 'path';
const signal_param_oldpath = 'oldpath';
const signal_param_newpath = 'newpath';
/**
* run - changing this flag to false in hook handler will cancel event
*/
const signal_param_run = 'run';
const signal_create_mount = 'create_mount';
const signal_delete_mount = 'delete_mount';
const signal_param_mount_type = 'mounttype';
const signal_param_users = 'users';
/**
* @var \OC\Files\Storage\StorageFactory $loader
*/
private static $loader;
/** @var bool */
private static $logWarningWhenAddingStorageWrapper = true;
/**
* @param bool $shouldLog
* @return bool previous value
* @internal
*/
public static function logWarningWhenAddingStorageWrapper($shouldLog) {
$previousValue = self::$logWarningWhenAddingStorageWrapper;
self::$logWarningWhenAddingStorageWrapper = (bool) $shouldLog;
return $previousValue;
}
/**
* @param string $wrapperName
* @param callable $wrapper
* @param int $priority
*/
public static function addStorageWrapper($wrapperName, $wrapper, $priority = 50) {
if (self::$logWarningWhenAddingStorageWrapper) {
\OC::$server->getLogger()->warning("Storage wrapper '{wrapper}' was not registered via the 'OC_Filesystem - preSetup' hook which could cause potential problems.", [
'wrapper' => $wrapperName,
'app' => 'filesystem',
]);
}
$mounts = self::getMountManager()->getAll();
if (!self::getLoader()->addStorageWrapper($wrapperName, $wrapper, $priority, $mounts)) {
// do not re-wrap if storage with this name already existed
return;
}
}
/**
* Returns the storage factory
*
* @return \OCP\Files\Storage\IStorageFactory
*/
public static function getLoader() {
if (!self::$loader) {
self::$loader = new StorageFactory();
}
return self::$loader;
}
/**
* Returns the mount manager
*
* @return \OC\Files\Mount\Manager
*/
public static function getMountManager($user = '') {
if (!self::$mounts) {
\OC_Util::setupFS($user);
}
return self::$mounts;
}
/**
* get the mountpoint of the storage object for a path
* ( note: because a storage is not always mounted inside the fakeroot, the
* returned mountpoint is relative to the absolute root of the filesystem
* and doesn't take the chroot into account )
*
* @param string $path
* @return string
*/
static public function getMountPoint($path) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = self::$mounts->find($path);
if ($mount) {
return $mount->getMountPoint();
} else {
return '';
}
}
/**
* get a list of all mount points in a directory
*
* @param string $path
* @return string[]
*/
static public function getMountPoints($path) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$result = array();
$mounts = self::$mounts->findIn($path);
foreach ($mounts as $mount) {
$result[] = $mount->getMountPoint();
}
return $result;
}
/**
* get the storage mounted at $mountPoint
*
* @param string $mountPoint
* @return \OC\Files\Storage\Storage
*/
public static function getStorage($mountPoint) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = self::$mounts->find($mountPoint);
return $mount->getStorage();
}
/**
* @param string $id
* @return Mount\MountPoint[]
*/
public static function getMountByStorageId($id) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
return self::$mounts->findByStorageId($id);
}
/**
* @param int $id
* @return Mount\MountPoint[]
*/
public static function getMountByNumericId($id) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
return self::$mounts->findByNumericId($id);
}
/**
* resolve a path to a storage and internal path
*
* @param string $path
* @return array an array consisting of the storage and the internal path
*/
static public function resolvePath($path) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = self::$mounts->find($path);
if ($mount) {
return array($mount->getStorage(), rtrim($mount->getInternalPath($path), '/'));
} else {
return array(null, null);
}
}
static public function init($user, $root) {
if (self::$defaultInstance) {
return false;
}
self::getLoader();
self::$defaultInstance = new View($root);
if (!self::$mounts) {
self::$mounts = \OC::$server->getMountManager();
}
//load custom mount config
self::initMountPoints($user);
self::$loaded = true;
return true;
}
static public function initMountManager() {
if (!self::$mounts) {
self::$mounts = \OC::$server->getMountManager();
}
}
/**
* Initialize system and personal mount points for a user
*
* @param string $user
* @throws \OC\User\NoUserException if the user is not available
*/
public static function initMountPoints($user = '') {
if ($user == '') {
$user = \OC_User::getUser();
}
if ($user === null || $user === false || $user === '') {
throw new \OC\User\NoUserException('Attempted to initialize mount points for null user and no user in session');
}
if (isset(self::$usersSetup[$user])) {
return;
}
self::$usersSetup[$user] = true;
$userManager = \OC::$server->getUserManager();
$userObject = $userManager->get($user);
if (is_null($userObject)) {
\OCP\Util::writeLog('files', ' Backends provided no user object for ' . $user, \OCP\Util::ERROR);
// reset flag, this will make it possible to rethrow the exception if called again
unset(self::$usersSetup[$user]);
throw new \OC\User\NoUserException('Backends provided no user object for ' . $user);
}
$realUid = $userObject->getUID();
// workaround in case of different casings
if ($user !== $realUid) {
$stack = json_encode(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 50));
\OCP\Util::writeLog('files', 'initMountPoints() called with wrong user casing. This could be a bug. Expected: "' . $realUid . '" got "' . $user . '". Stack: ' . $stack, \OCP\Util::WARN);
$user = $realUid;
// again with the correct casing
if (isset(self::$usersSetup[$user])) {
return;
}
self::$usersSetup[$user] = true;
}
if (\OC::$server->getLockdownManager()->canAccessFilesystem()) {
/** @var \OC\Files\Config\MountProviderCollection $mountConfigManager */
$mountConfigManager = \OC::$server->getMountProviderCollection();
// home mounts are handled seperate since we need to ensure this is mounted before we call the other mount providers
$homeMount = $mountConfigManager->getHomeMountForUser($userObject);
self::getMountManager()->addMount($homeMount);
\OC\Files\Filesystem::getStorage($user);
// Chance to mount for other storages
if ($userObject) {
$mounts = $mountConfigManager->addMountForUser($userObject, self::getMountManager());
$mounts[] = $homeMount;
$mountConfigManager->registerMounts($userObject, $mounts);
}
self::listenForNewMountProviders($mountConfigManager, $userManager);
} else {
self::getMountManager()->addMount(new MountPoint(
new NullStorage([]),
'/' . $user
));
self::getMountManager()->addMount(new MountPoint(
new NullStorage([]),
'/' . $user . '/files'
));
}
\OC_Hook::emit('OC_Filesystem', 'post_initMountPoints', array('user' => $user));
}
/**
* Get mounts from mount providers that are registered after setup
*
* @param MountProviderCollection $mountConfigManager
* @param IUserManager $userManager
*/
private static function listenForNewMountProviders(MountProviderCollection $mountConfigManager, IUserManager $userManager) {
if (!self::$listeningForProviders) {
self::$listeningForProviders = true;
$mountConfigManager->listen('\OC\Files\Config', 'registerMountProvider', function (IMountProvider $provider) use ($userManager) {
foreach (Filesystem::$usersSetup as $user => $setup) {
$userObject = $userManager->get($user);
if ($userObject) {
$mounts = $provider->getMountsForUser($userObject, Filesystem::getLoader());
array_walk($mounts, array(self::$mounts, 'addMount'));
}
}
});
}
}
/**
* get the default filesystem view
*
* @return View
*/
static public function getView() {
return self::$defaultInstance;
}
/**
* tear down the filesystem, removing all storage providers
*/
static public function tearDown() {
self::clearMounts();
self::$defaultInstance = null;
}
/**
* get the relative path of the root data directory for the current user
*
* @return string
*
* Returns path like /admin/files
*/
static public function getRoot() {
if (!self::$defaultInstance) {
return null;
}
return self::$defaultInstance->getRoot();
}
/**
* clear all mounts and storage backends
*/
public static function clearMounts() {
if (self::$mounts) {
self::$usersSetup = array();
self::$mounts->clear();
}
}
/**
* mount an \OC\Files\Storage\Storage in our virtual filesystem
*
* @param \OC\Files\Storage\Storage|string $class
* @param array $arguments
* @param string $mountpoint
*/
static public function mount($class, $arguments, $mountpoint) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = new Mount\MountPoint($class, $mountpoint, $arguments, self::getLoader());
self::$mounts->addMount($mount);
}
/**
* return the path to a local version of the file
* we need this because we can't know if a file is stored local or not from
* outside the filestorage and for some purposes a local file is needed
*
* @param string $path
* @return string
*/
static public function getLocalFile($path) {
return self::$defaultInstance->getLocalFile($path);
}
/**
* @param string $path
* @return string
*/
static public function getLocalFolder($path) {
return self::$defaultInstance->getLocalFolder($path);
}
/**
* return path to file which reflects one visible in browser
*
* @param string $path
* @return string
*/
static public function getLocalPath($path) {
$datadir = \OC_User::getHome(\OC_User::getUser()) . '/files';
$newpath = $path;
if (strncmp($newpath, $datadir, strlen($datadir)) == 0) {
$newpath = substr($path, strlen($datadir));
}
return $newpath;
}
/**
* check if the requested path is valid
*
* @param string $path
* @return bool
*/
static public function isValidPath($path) {
$path = self::normalizePath($path);
if (!$path || $path[0] !== '/') {
$path = '/' . $path;
}
if (strpos($path, '/../') !== false || strrchr($path, '/') === '/..') {
return false;
}
return true;
}
/**
* checks if a file is blacklisted for storage in the filesystem
* Listens to write and rename hooks
*
* @param array $data from hook
*/
static public function isBlacklisted($data) {
if (isset($data['path'])) {
$path = $data['path'];
} else if (isset($data['newpath'])) {
$path = $data['newpath'];
}
if (isset($path)) {
if (self::isFileBlacklisted($path)) {
$data['run'] = false;
}
}
}
/**
* @param string $filename
* @return bool
*/
static public function isFileBlacklisted($filename) {
$filename = self::normalizePath($filename);
$blacklist = \OC::$server->getConfig()->getSystemValue('blacklisted_files', array('.htaccess'));
$filename = strtolower(basename($filename));
return in_array($filename, $blacklist);
}
/**
* check if the directory should be ignored when scanning
* NOTE: the special directories . and .. would cause never ending recursion
*
* @param String $dir
* @return boolean
*/
static public function isIgnoredDir($dir) {
if ($dir === '.' || $dir === '..') {
return true;
}
return false;
}
/**
* following functions are equivalent to their php builtin equivalents for arguments/return values.
*/
static public function mkdir($path) {
return self::$defaultInstance->mkdir($path);
}
static public function rmdir($path) {
return self::$defaultInstance->rmdir($path);
}
static public function is_dir($path) {
return self::$defaultInstance->is_dir($path);
}
static public function is_file($path) {
return self::$defaultInstance->is_file($path);
}
static public function stat($path) {
return self::$defaultInstance->stat($path);
}
static public function filetype($path) {
return self::$defaultInstance->filetype($path);
}
static public function filesize($path) {
return self::$defaultInstance->filesize($path);
}
static public function readfile($path) {
return self::$defaultInstance->readfile($path);
}
static public function isCreatable($path) {
return self::$defaultInstance->isCreatable($path);
}
static public function isReadable($path) {
return self::$defaultInstance->isReadable($path);
}
static public function isUpdatable($path) {
return self::$defaultInstance->isUpdatable($path);
}
static public function isDeletable($path) {
return self::$defaultInstance->isDeletable($path);
}
static public function isSharable($path) {
return self::$defaultInstance->isSharable($path);
}
static public function file_exists($path) {
return self::$defaultInstance->file_exists($path);
}
static public function filemtime($path) {
return self::$defaultInstance->filemtime($path);
}
static public function touch($path, $mtime = null) {
return self::$defaultInstance->touch($path, $mtime);
}
/**
* @return string
*/
static public function file_get_contents($path) {
return self::$defaultInstance->file_get_contents($path);
}
static public function file_put_contents($path, $data) {
return self::$defaultInstance->file_put_contents($path, $data);
}
static public function unlink($path) {
return self::$defaultInstance->unlink($path);
}
static public function rename($path1, $path2) {
return self::$defaultInstance->rename($path1, $path2);
}
static public function copy($path1, $path2) {
return self::$defaultInstance->copy($path1, $path2);
}
static public function fopen($path, $mode) {
return self::$defaultInstance->fopen($path, $mode);
}
/**
* @return string
*/
static public function toTmpFile($path) {
return self::$defaultInstance->toTmpFile($path);
}
static public function fromTmpFile($tmpFile, $path) {
return self::$defaultInstance->fromTmpFile($tmpFile, $path);
}
static public function getMimeType($path) {
return self::$defaultInstance->getMimeType($path);
}
static public function hash($type, $path, $raw = false) {
return self::$defaultInstance->hash($type, $path, $raw);
}
static public function free_space($path = '/') {
return self::$defaultInstance->free_space($path);
}
static public function search($query) {
return self::$defaultInstance->search($query);
}
/**
* @param string $query
*/
static public function searchByMime($query) {
return self::$defaultInstance->searchByMime($query);
}
/**
* @param string|int $tag name or tag id
* @param string $userId owner of the tags
* @return FileInfo[] array or file info
*/
static public function searchByTag($tag, $userId) {
return self::$defaultInstance->searchByTag($tag, $userId);
}
/**
* check if a file or folder has been updated since $time
*
* @param string $path
* @param int $time
* @return bool
*/
static public function hasUpdated($path, $time) {
return self::$defaultInstance->hasUpdated($path, $time);
}
/**
* Fix common problems with a file path
*
* @param string $path
* @param bool $stripTrailingSlash whether to strip the trailing slash
* @param bool $isAbsolutePath whether the given path is absolute
* @param bool $keepUnicode true to disable unicode normalization
* @return string
*/
public static function normalizePath($path, $stripTrailingSlash = true, $isAbsolutePath = false, $keepUnicode = false) {
if (is_null(self::$normalizedPathCache)) {
self::$normalizedPathCache = new CappedMemoryCache();
}
/**
* FIXME: This is a workaround for existing classes and files which call
* this function with another type than a valid string. This
* conversion should get removed as soon as all existing
* function calls have been fixed.
*/
$path = (string)$path;
$cacheKey = json_encode([$path, $stripTrailingSlash, $isAbsolutePath, $keepUnicode]);
if (isset(self::$normalizedPathCache[$cacheKey])) {
return self::$normalizedPathCache[$cacheKey];
}
if ($path == '') {
return '/';
}
//normalize unicode if possible
if (!$keepUnicode) {
$path = \OC_Util::normalizeUnicode($path);
}
//no windows style slashes
$path = str_replace('\\', '/', $path);
//add leading slash
if ($path[0] !== '/') {
$path = '/' . $path;
}
// remove '/./'
// ugly, but str_replace() can't replace them all in one go
// as the replacement itself is part of the search string
// which will only be found during the next iteration
while (strpos($path, '/./') !== false) {
$path = str_replace('/./', '/', $path);
}
// remove sequences of slashes
$path = preg_replace('#/{2,}#', '/', $path);
//remove trailing slash
if ($stripTrailingSlash and strlen($path) > 1 and substr($path, -1, 1) === '/') {
$path = substr($path, 0, -1);
}
// remove trailing '/.'
if (substr($path, -2) == '/.') {
$path = substr($path, 0, -2);
}
$normalizedPath = $path;
self::$normalizedPathCache[$cacheKey] = $normalizedPath;
return $normalizedPath;
}
/**
* get the filesystem info
*
* @param string $path
* @param boolean $includeMountPoints whether to add mountpoint sizes,
* defaults to true
* @return \OC\Files\FileInfo|bool False if file does not exist
*/
public static function getFileInfo($path, $includeMountPoints = true) {
return self::$defaultInstance->getFileInfo($path, $includeMountPoints);
}
/**
* change file metadata
*
* @param string $path
* @param array $data
* @return int
*
* returns the fileid of the updated file
*/
public static function putFileInfo($path, $data) {
return self::$defaultInstance->putFileInfo($path, $data);
}
/**
* get the content of a directory
*
* @param string $directory path under datadirectory
* @param string $mimetype_filter limit returned content to this mimetype or mimepart
* @return \OC\Files\FileInfo[]
*/
public static function getDirectoryContent($directory, $mimetype_filter = '') {
return self::$defaultInstance->getDirectoryContent($directory, $mimetype_filter);
}
/**
* Get the path of a file by id
*
* Note that the resulting path is not guaranteed to be unique for the id, multiple paths can point to the same file
*
* @param int $id
* @throws NotFoundException
* @return string
*/
public static function getPath($id) {
return self::$defaultInstance->getPath($id);
}
/**
* Get the owner for a file or folder
*
* @param string $path
* @return string
*/
public static function getOwner($path) {
return self::$defaultInstance->getOwner($path);
}
/**
* get the ETag for a file or folder
*
* @param string $path
* @return string
*/
static public function getETag($path) {
return self::$defaultInstance->getETag($path);
}
}