nextcloud/lib/private/files/filesystem.php

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2012-10-10 13:54:44 +04:00
<?php
/**
* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
/**
* Class for abstraction of filesystem functions
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* This class won't call any filesystem functions for itself but will pass them to the correct OC_Filestorage object
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* 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)
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* 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)
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* post_rename(oldpath,newpath)
* post_initMountPoints(user, user_dir)
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*
* the &run parameter can be set to false to prevent the operation from occurring
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*/
namespace OC\Files;
use OC\Files\Storage\StorageFactory;
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class Filesystem {
/**
* @var Mount\Manager $mounts
*/
private static $mounts;
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public static $loaded = false;
/**
* @var \OC\Files\View $defaultInstance
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*/
static private $defaultInstance;
static private $usersSetup = array();
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static private $normalizedPathCache = array();
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/**
* classname which used for hooks handling
* used as signalclass in OC_Hooks::emit()
*/
const CLASSNAME = 'OC_Filesystem';
/**
* signalname emitted before file renaming
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*
* @param string $oldpath
* @param string $newpath
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*/
const signal_rename = 'rename';
/**
* signal emitted after file renaming
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*
* @param string $oldpath
* @param string $newpath
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*/
const signal_post_rename = 'post_rename';
/**
* signal emitted before file/dir creation
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*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
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*/
const signal_create = 'create';
/**
* signal emitted after file/dir creation
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*
* @param string $path
* @param bool $run changing this flag to false in hook handler will cancel event
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*/
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
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*/
const signal_copy = 'copy';
/**
* signal emits after file/dir copy
*
* @param string $oldpath
* @param string $newpath
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*/
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
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*/
const signal_write = 'write';
/**
* signal emits after file/dir save
*
* @param string $path
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*/
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';
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/**
* signal emits when reading file/dir
*
* @param string $path
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*/
const signal_read = 'read';
/**
* signal emits when removing file/dir
*
* @param string $path
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*/
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;
/**
* @param callable $wrapper
*/
public static function addStorageWrapper($wrapperName, $wrapper) {
self::getLoader()->addStorageWrapper($wrapperName, $wrapper);
$mounts = self::getMountManager()->getAll();
foreach ($mounts as $mount) {
$mount->wrapStorage($wrapper);
}
}
public static function getLoader() {
if (!self::$loader) {
self::$loader = new StorageFactory();
}
return self::$loader;
}
public static function getMountManager() {
if (!self::$mounts) {
\OC_Util::setupFS();
}
return self::$mounts;
}
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/**
* get the mountpoint of the storage object for a path
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* ( 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 )
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*
* @param string $path
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* @return string
*/
static public function getMountPoint($path) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = self::$mounts->find($path);
if ($mount) {
return $mount->getMountPoint();
} else {
return '';
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}
}
/**
* 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);
}
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/**
* resolve a path to a storage and internal path
*
* @param string $path
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* @return array an array consisting of the storage and the internal path
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*/
static public function resolvePath($path) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = self::$mounts->find($path);
if ($mount) {
return array($mount->getStorage(), $mount->getInternalPath($path));
} else {
return array(null, null);
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}
}
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static public function init($user, $root) {
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if (self::$defaultInstance) {
return false;
}
self::getLoader();
self::$defaultInstance = new View($root);
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if (!self::$mounts) {
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self::$mounts = new Mount\Manager();
}
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//load custom mount config
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self::initMountPoints($user);
self::$loaded = true;
return true;
}
static public function initMounts() {
if (!self::$mounts) {
self::$mounts = new Mount\Manager();
}
}
/**
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* Initialize system and personal mount points for a user
*
* @param string $user
*/
public static function initMountPoints($user = '') {
if ($user == '') {
$user = \OC_User::getUser();
}
if (isset(self::$usersSetup[$user])) {
return;
}
self::$usersSetup[$user] = true;
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$root = \OC_User::getHome($user);
$userObject = \OC_User::getManager()->get($user);
if (!is_null($userObject)) {
$homeStorage = \OC_Config::getValue( 'objectstore' );
if (!empty($homeStorage)) {
// sanity checks
if (empty($homeStorage['class'])) {
\OCP\Util::writeLog('files', 'No class given for objectstore', \OCP\Util::ERROR);
}
if (!isset($homeStorage['arguments'])) {
$homeStorage['arguments'] = array();
}
// instantiate object store implementation
$homeStorage['arguments']['objectstore'] = new $homeStorage['class']($homeStorage['arguments']);
// mount with home object store implementation
$homeStorage['class'] = '\OC\Files\ObjectStore\HomeObjectStoreStorage';
} else {
$homeStorage = array(
//default home storage configuration:
'class' => '\OC\Files\Storage\Home',
'arguments' => array()
);
}
$homeStorage['arguments']['user'] = $userObject;
// check for legacy home id (<= 5.0.12)
if (\OC\Files\Cache\Storage::exists('local::' . $root . '/')) {
$homeStorage['arguments']['legacy'] = true;
}
self::mount($homeStorage['class'], $homeStorage['arguments'], $user);
$home = \OC\Files\Filesystem::getStorage($user);
}
else {
self::mount('\OC\Files\Storage\Local', array('datadir' => $root), $user);
}
self::mountCacheDir($user);
// Chance to mount for other storages
if($userObject) {
$mountConfigManager = \OC::$server->getMountProviderCollection();
$mounts = $mountConfigManager->getMountsForUser($userObject);
array_walk($mounts, array(self::$mounts, 'addMount'));
}
\OC_Hook::emit('OC_Filesystem', 'post_initMountPoints', array('user' => $user, 'user_dir' => $root));
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}
/**
* Mounts the cache directory
* @param string $user user name
*/
private static function mountCacheDir($user) {
$cacheBaseDir = \OC_Config::getValue('cache_path', '');
if ($cacheBaseDir === '') {
// use local cache dir relative to the user's home
$subdir = 'cache';
$view = new \OC\Files\View('/' . $user);
if(!$view->file_exists($subdir)) {
$view->mkdir($subdir);
}
} else {
$cacheDir = rtrim($cacheBaseDir, '/') . '/' . $user;
if (!file_exists($cacheDir)) {
mkdir($cacheDir, 0770, true);
}
// mount external cache dir to "/$user/cache" mount point
self::mount('\OC\Files\Storage\Local', array('datadir' => $cacheDir), '/' . $user . '/cache');
}
}
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/**
* get the default filesystem view
*
* @return View
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*/
static public function getView() {
return self::$defaultInstance;
}
/**
* tear down the filesystem, removing all storage providers
*/
static public function tearDown() {
self::clearMounts();
self::$defaultInstance = null;
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}
/**
* get the relative path of the root data directory for the current user
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* @return string
*
* Returns path like /admin/files
*/
static public function getRoot() {
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if (!self::$defaultInstance) {
return null;
}
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return self::$defaultInstance->getRoot();
}
/**
* clear all mounts and storage backends
*/
public static function clearMounts() {
if (self::$mounts) {
self::$usersSetup = array();
self::$mounts->clear();
}
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}
/**
* mount an \OC\Files\Storage\Storage in our virtual filesystem
*
* @param \OC\Files\Storage\Storage|string $class
* @param array $arguments
* @param string $mountpoint
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*/
static public function mount($class, $arguments, $mountpoint) {
if (!self::$mounts) {
\OC_Util::setupFS();
}
$mount = new Mount\MountPoint($class, $mountpoint, $arguments, self::getLoader());
self::$mounts->addMount($mount);
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}
/**
* return the path to a local version of the file
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* 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
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*
* @param string $path
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* @return string
*/
static public function getLocalFile($path) {
return self::$defaultInstance->getLocalFile($path);
}
/**
* @param string $path
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* @return string
*/
static public function getLocalFolder($path) {
return self::$defaultInstance->getLocalFolder($path);
}
/**
* return path to file which reflects one visible in browser
*
* @param string $path
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* @return string
*/
static public function getLocalPath($path) {
$datadir = \OC_User::getHome(\OC_User::getUser()) . '/files';
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$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 $path
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* @return bool
*/
static public function isValidPath($path) {
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$path = self::normalizePath($path);
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if (!$path || $path[0] !== '/') {
$path = '/' . $path;
}
if (strpos($path, '/../') !== FALSE || strrchr($path, '/') === '/..') {
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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($path)) {
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$data['run'] = false;
}
}
}
/**
* @param string $filename
* @return bool
*/
static public function isFileBlacklisted($filename) {
$blacklist = \OC_Config::getValue('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 === '.' || $dir === '..') {
return true;
}
return false;
}
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/**
* following functions are equivalent to their php builtin equivalents for arguments/return values.
*/
static public function mkdir($path) {
return self::$defaultInstance->mkdir($path);
}
static public function rmdir($path) {
return self::$defaultInstance->rmdir($path);
}
static public function opendir($path) {
return self::$defaultInstance->opendir($path);
}
static public function readdir($path) {
return self::$defaultInstance->readdir($path);
}
static public function is_dir($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, $mtime);
}
/**
* @return string
*/
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static public function file_get_contents($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, $mode);
}
/**
* @return string
*/
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static public function toTmpFile($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($query) {
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return self::$defaultInstance->search($query);
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}
/**
* @param string $query
*/
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static public function searchByMime($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);
}
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/**
* check if a file or folder has been updated since $time
*
* @param string $path
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* @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
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* @param bool $stripTrailingSlash
* @return string
*/
public static function normalizePath($path, $stripTrailingSlash = true, $isAbsolutePath = false) {
$cacheKey = json_encode([$path, $stripTrailingSlash, $isAbsolutePath]);
if(isset(self::$normalizedPathCache[$cacheKey])) {
return self::$normalizedPathCache[$cacheKey];
}
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if ($path == '') {
return '/';
}
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//no windows style slashes
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$path = str_replace('\\', '/', $path);
// When normalizing an absolute path, we need to ensure that the drive-letter
// is still at the beginning on windows
$windows_drive_letter = '';
if ($isAbsolutePath && \OC_Util::runningOnWindows() && preg_match('#^([a-zA-Z])$#', $path[0]) && $path[1] == ':' && $path[2] == '/') {
$windows_drive_letter = substr($path, 0, 2);
$path = substr($path, 2);
}
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//add leading slash
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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);
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}
// remove sequences of slashes
$path = preg_replace('#/{2,}#', '/', $path);
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//remove trailing slash
if ($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);
}
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//normalize unicode if possible
$path = \OC_Util::normalizeUnicode($path);
$normalizedPath = $windows_drive_letter . $path;
self::$normalizedPathCache[$cacheKey] = $normalizedPath;
return $normalizedPath;
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}
/**
* get the filesystem info
*
* @param string $path
* @param boolean $includeMountPoints whether to add mountpoint sizes,
* defaults to true
* @return \OC\Files\FileInfo
*/
public static function getFileInfo($path, $includeMountPoints = true) {
return self::$defaultInstance->getFileInfo($path, $includeMountPoints);
}
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/**
* 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
*
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* Note that the resulting path is not guaranteed to be unique for the id, multiple paths can point to the same file
*
* @param int $id
* @return string
*/
public static function getPath($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 $path
* @return string
*/
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static public function getETag($path) {
return self::$defaultInstance->getETag($path);
}
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}