nextcloud/lib/files/filesystem.php

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<?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
* This class won't call any filesystem functions for itself but 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)
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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)
*
* the &run parameter can be set to false to prevent the operation from occurring
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*/
namespace OC\Files;
class Filesystem {
static private $storages = array();
static private $mounts = array();
public static $loaded = false;
/**
* @var \OC\Files\View $defaultInstance
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*/
static private $defaultInstance;
/**
* 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 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';
/**
* 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 $path
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* @return string
*/
static public function getMountPoint($path) {
\OC_Hook::emit(self::CLASSNAME, 'get_mountpoint', array('path' => $path));
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if (!$path) {
$path = '/';
}
if ($path[0] !== '/') {
$path = '/' . $path;
}
$path = str_replace('//', '/', $path);
$foundMountPoint = '';
$mountPoints = array_keys(self::$mounts);
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foreach ($mountPoints as $mountpoint) {
if ($mountpoint == $path) {
return $mountpoint;
}
if (strpos($path, $mountpoint) === 0 and strlen($mountpoint) > strlen($foundMountPoint)) {
$foundMountPoint = $mountpoint;
}
}
return $foundMountPoint;
}
/**
* get a list of all mount points in a directory
*
* @param string $path
* @return string[]
*/
static public function getMountPoints($path) {
$path = self::normalizePath($path);
if (strlen($path) > 1) {
$path .= '/';
}
$pathLength = strlen($path);
$mountPoints = array_keys(self::$mounts);
$result = array();
foreach ($mountPoints as $mountPoint) {
if (substr($mountPoint, 0, $pathLength) === $path and strlen($mountPoint) > $pathLength) {
$result[] = $mountPoint;
}
}
return $result;
}
/**
* get the storage mounted at $mountPoint
*
* @param string $mountPoint
* @return \OC\Files\Storage\Storage
*/
public static function getStorage($mountPoint) {
if (!isset(self::$storages[$mountPoint])) {
$mount = self::$mounts[$mountPoint];
self::$storages[$mountPoint] = self::createStorage($mount['class'], $mount['arguments']);
}
return self::$storages[$mountPoint];
}
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/**
* resolve a path to a storage and internal path
*
* @param string $path
* @return array consisting of the storage and the internal path
*/
static public function resolvePath($path) {
$mountpoint = self::getMountPoint($path);
if ($mountpoint) {
$storage = self::getStorage($mountpoint);
if ($mountpoint === $path) {
$internalPath = '';
} else {
$internalPath = substr($path, strlen($mountpoint));
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}
return array($storage, $internalPath);
} else {
return array(null, null);
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}
}
static public function init($root) {
if (self::$defaultInstance) {
return false;
}
self::$defaultInstance = new View($root);
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//load custom mount config
self::initMountPoints();
self::$loaded = true;
return true;
}
/**
* Initialize system and personal mount points for a user
*
* @param string $user
*/
public static function initMountPoints($user = '') {
if ($user == '') {
$user = \OC_User::getUser();
}
// Load system mount points
if (is_file(\OC::$SERVERROOT.'/config/mount.php')) {
$mountConfig = include 'config/mount.php';
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if (isset($mountConfig['global'])) {
foreach ($mountConfig['global'] as $mountPoint => $options) {
self::mount($options['class'], $options['options'], $mountPoint);
}
}
if (isset($mountConfig['group'])) {
foreach ($mountConfig['group'] as $group => $mounts) {
if (\OC_Group::inGroup($user, $group)) {
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foreach ($mounts as $mountPoint => $options) {
$mountPoint = self::setUserVars($user, $mountPoint);
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foreach ($options as &$option) {
$option = self::setUserVars($user, $option);
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}
self::mount($options['class'], $options['options'], $mountPoint);
}
}
}
}
if (isset($mountConfig['user'])) {
foreach ($mountConfig['user'] as $mountUser => $mounts) {
if ($user === 'all' or strtolower($mountUser) === strtolower($user)) {
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foreach ($mounts as $mountPoint => $options) {
$mountPoint = self::setUserVars($user, $mountPoint);
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foreach ($options as &$option) {
$option = self::setUserVars($user, $option);
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}
self::mount($options['class'], $options['options'], $mountPoint);
}
}
}
}
}
// Load personal mount points
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$root = \OC_User::getHome($user);
if (is_file($root.'/mount.php')) {
$mountConfig = include $root.'/mount.php';
if (isset($mountConfig['user'][$user])) {
foreach ($mountConfig['user'][$user] as $mountPoint => $options) {
self::mount($options['class'], $options['options'], $mountPoint);
}
}
}
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}
/**
* fill in the correct values for $user, and $password placeholders
*
* @param string $input
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* @return string
*/
private static function setUserVars($user, $input) {
return str_replace('$user', $user, $input);
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}
/**
* get the default filesystem view
*
* @return View
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*/
static public function getView() {
return self::$defaultInstance;
}
/**
* tear down the filesystem, removing all storage providers
*/
static public function tearDown() {
self::$storages = array();
}
/**
* create a new storage of a specific type
*
* @param string $type
* @param array $arguments
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* @return \OC\Files\Storage\Storage
*/
static private function createStorage($class, $arguments) {
if (class_exists($class)) {
try {
return new $class($arguments);
} catch (\Exception $exception) {
\OC_Log::write('core', $exception->getMessage(), \OC_Log::ERROR);
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return false;
}
} else {
\OC_Log::write('core', 'storage backend ' . $class . ' not found', \OC_Log::ERROR);
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return false;
}
}
/**
* @brief get the relative path of the root data directory for the current user
* @return string
*
* Returns path like /admin/files
*/
static public function getRoot() {
return self::$defaultInstance->getRoot();
}
/**
* clear all mounts and storage backends
*/
public static function clearMounts() {
self::$mounts = array();
self::$storages = array();
}
/**
* 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) {
$mountpoint = self::normalizePath($mountpoint);
if (strlen($mountpoint) > 1) {
$mountpoint .= '/';
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}
if ($class instanceof \OC\Files\Storage\Storage) {
self::$mounts[$mountpoint] = array('class' => get_class($class), 'arguments' => $arguments);
self::$storages[$mountpoint] = $class;
} else {
self::$mounts[$mountpoint] = array('class' => $class, 'arguments' => $arguments);
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}
}
/**
* 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 $path
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* @return string
*/
static public function getLocalFile($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 = '/' . $path;
}
if (strstr($path, '/../') || 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) {
$blacklist = array('.htaccess');
if (isset($data['path'])) {
$path = $data['path'];
} else if (isset($data['newpath'])) {
$path = $data['newpath'];
}
if (isset($path)) {
$filename = strtolower(basename($path));
if (in_array($filename, $blacklist)) {
$data['run'] = false;
}
}
}
/**
* following functions are equivalent to their php builtin equivalents for arguments/return values.
*/
static public function mkdir($path) {
return self::$defaultInstance->mkdir($path);
}
static public function rmdir($path) {
return self::$defaultInstance->rmdir($path);
}
static public function opendir($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, $mtime);
}
static public function file_get_contents($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, $mode);
}
static public function toTmpFile($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($query);
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}
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static public function searchByMime($query) {
return self::$defaultInstance->searchByMime($query);
}
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/**
* check if a file or folder has been updated since $time
*
* @param int $time
* @return bool
*/
static public function hasUpdated($path, $time) {
return self::$defaultInstance->hasUpdated($path, $time);
}
static public function removeETagHook($params, $root = false) {
if (isset($params['path'])) {
$path = $params['path'];
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} else {
$path = $params['oldpath'];
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}
if ($root) { // reduce path to the required part of it (no 'username/files')
$fakeRootView = new View($root);
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$count = 1;
$path = str_replace(\OC_App::getStorage("files")->getAbsolutePath(''), "", $fakeRootView->getAbsolutePath($path), $count);
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}
$path = self::normalizePath($path);
\OC_Connector_Sabre_Node::removeETagPropertyForPath($path);
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}
/**
* normalize a path
*
* @param string $path
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* @param bool $stripTrailingSlash
* @return string
*/
public static function normalizePath($path, $stripTrailingSlash = true) {
if ($path == '') {
return '/';
}
//no windows style slashes
$path = str_replace('\\', '/', $path);
//add leading slash
if ($path[0] !== '/') {
$path = '/' . $path;
}
//remove duplicate slashes
while (strpos($path, '//') !== false) {
$path = str_replace('//', '/', $path);
}
//remove trailing slash
if ($stripTrailingSlash and strlen($path) > 1 and substr($path, -1, 1) === '/') {
$path = substr($path, 0, -1);
}
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//normalize unicode if possible
if (class_exists('Normalizer')) {
$path = \Normalizer::normalize($path);
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}
return $path;
}
/**
* get the filesystem info
*
* @param string $path
* @return array
*
* returns an associative array with the following keys:
* - size
* - mtime
* - mimetype
* - encrypted
* - versioned
*/
public static function getFileInfo($path) {
return self::$defaultInstance->getFileInfo($path);
}
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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 $directory path under datadirectory
* @return array
*/
public static function getDirectoryContent($directory, $mimetype_filter = '') {
return self::$defaultInstance->getDirectoryContent($directory, $mimetype_filter);
}
/**
* get the ETag for a file or folder
*
* @param string $path
* @return string
*/
static public function getETag($path){
return self::$defaultInstance->getETag($path);
}
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}
\OC_Hook::connect('OC_Filesystem', 'post_write', 'OC_Filesystem', 'removeETagHook');
\OC_Hook::connect('OC_Filesystem', 'post_delete', 'OC_Filesystem', 'removeETagHook');
\OC_Hook::connect('OC_Filesystem', 'post_rename', 'OC_Filesystem', 'removeETagHook');
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\OC_Util::setupFS();