597 lines
17 KiB
PHP
597 lines
17 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Frank Karlitschek
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* @copyright 2012 Frank Karlitschek frank@owncloud.org
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Class to provide access to ownCloud filesystem via a "view", and methods for
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* working with files within that view (e.g. read, write, delete, etc.). Each
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* view is restricted to a set of directories via a virtual root. The default view
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* uses the currently logged in user's data directory as root (parts of
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* OC_Filesystem are merely a wrapper for OC_FilesystemView).
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*
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* Apps that need to access files outside of the user data folders (to modify files
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* belonging to a user other than the one currently logged in, for example) should
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* use this class directly rather than using OC_Filesystem, or making use of PHP's
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* built-in file manipulation functions. This will ensure all hooks and proxies
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* are triggered correctly.
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*
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* Filesystem functions are not called directly; they are passed to the correct
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* OC_Filestorage object
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*/
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class OC_FilesystemView {
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private $fakeRoot='';
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private $internal_path_cache=array();
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private $storage_cache=array();
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public function __construct($root) {
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$this->fakeRoot=$root;
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}
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public function getAbsolutePath($path) {
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if(!$path){
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$path='/';
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}
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if($path[0]!=='/'){
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$path='/'.$path;
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}
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return $this->fakeRoot.$path;
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}
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/**
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* change the root to a fake toor
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* @param string fakeRoot
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* @return bool
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*/
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public function chroot($fakeRoot) {
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if(!$fakeRoot==''){
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if($fakeRoot[0]!=='/') {
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$fakeRoot='/'.$fakeRoot;
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}
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}
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$this->fakeRoot=$fakeRoot;
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}
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/**
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* get the fake root
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* @return string
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*/
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public function getRoot() {
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return $this->fakeRoot;
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}
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/**
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* get the part of the path relative to the mountpoint of the storage it's stored in
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* @param string path
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* @return bool
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*/
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public function getInternalPath($path) {
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if (!isset($this->internal_path_cache[$path])) {
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$this->internal_path_cache[$path] = OC_Filesystem::getInternalPath($this->getAbsolutePath($path));
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}
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return $this->internal_path_cache[$path];
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}
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/**
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* get path relative to the root of the view
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* @param string path
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* @return string
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*/
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public function getRelativePath($path) {
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if($this->fakeRoot=='') {
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return $path;
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}
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if(strpos($path, $this->fakeRoot)!==0) {
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return null;
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}else{
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return substr($path, strlen($this->fakeRoot));
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}
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}
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/**
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* get the storage object for a path
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* @param string path
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* @return OC_Filestorage
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*/
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public function getStorage($path) {
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if (!isset($this->storage_cache[$path])) {
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$this->storage_cache[$path] = OC_Filesystem::getStorage($this->getAbsolutePath($path));
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}
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return $this->storage_cache[$path];
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}
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/**
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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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*
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* @param string path
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* @return string
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*/
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public function getMountPoint($path) {
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return OC_Filesystem::getMountPoint($this->getAbsolutePath($path));
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}
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/**
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* return the path to a local version of the file
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* we need this because we can't know if a file is stored local or not from outside the filestorage and for some purposes a local file is needed
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* @param string path
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* @return string
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*/
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public function getLocalFile($path) {
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$parent=substr($path, 0, strrpos($path,'/'));
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if(OC_Filesystem::isValidPath($parent) and $storage=$this->getStorage($path)) {
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return $storage->getLocalFile($this->getInternalPath($path));
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}
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}
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/**
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* the following functions operate with arguments and return values identical
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* to those of their PHP built-in equivalents. Mostly they are merely wrappers
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* for OC_Filestorage via basicOperation().
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*/
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public function mkdir($path) {
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return $this->basicOperation('mkdir', $path, array('create', 'write'));
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}
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public function rmdir($path) {
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return $this->basicOperation('rmdir', $path, array('delete'));
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}
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public function opendir($path) {
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return $this->basicOperation('opendir', $path, array('read'));
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}
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public function readdir($handle) {
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$fsLocal= new OC_Filestorage_Local( array( 'datadir' => '/' ) );
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return $fsLocal->readdir( $handle );
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}
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public function is_dir($path) {
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if($path=='/'){
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return true;
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}
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return $this->basicOperation('is_dir', $path);
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}
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public function is_file($path) {
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if($path=='/'){
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return false;
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}
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return $this->basicOperation('is_file', $path);
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}
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public function stat($path) {
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return $this->basicOperation('stat', $path);
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}
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public function filetype($path) {
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return $this->basicOperation('filetype', $path);
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}
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public function filesize($path) {
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return $this->basicOperation('filesize', $path);
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}
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public function readfile($path) {
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@ob_end_clean();
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$handle=$this->fopen($path, 'rb');
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if ($handle) {
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$chunkSize = 8192;// 8 MB chunks
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while (!feof($handle)) {
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echo fread($handle, $chunkSize);
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flush();
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}
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$size=$this->filesize($path);
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return $size;
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}
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return false;
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}
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/**
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* @deprecated Replaced by isReadable() as part of CRUDS
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*/
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public function is_readable($path){
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return $this->basicOperation('isReadable',$path);
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}
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/**
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* @deprecated Replaced by isCreatable(), isUpdatable(), isDeletable() as part of CRUDS
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*/
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public function is_writable($path){
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return $this->basicOperation('isUpdatable',$path);
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}
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public function isCreatable($path) {
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return $this->basicOperation('isCreatable', $path);
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}
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public function isReadable($path) {
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return $this->basicOperation('isReadable', $path);
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}
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public function isUpdatable($path) {
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return $this->basicOperation('isUpdatable', $path);
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}
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public function isDeletable($path) {
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return $this->basicOperation('isDeletable', $path);
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}
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public function isSharable($path) {
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return $this->basicOperation('isSharable', $path);
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}
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public function file_exists($path) {
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if($path=='/'){
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return true;
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}
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return $this->basicOperation('file_exists', $path);
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}
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public function filectime($path) {
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return $this->basicOperation('filectime', $path);
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}
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public function filemtime($path) {
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return $this->basicOperation('filemtime', $path);
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}
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public function touch($path, $mtime=null) {
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return $this->basicOperation('touch', $path, array('write'), $mtime);
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}
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public function file_get_contents($path) {
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return $this->basicOperation('file_get_contents', $path, array('read'));
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}
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public function file_put_contents($path, $data) {
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if(is_resource($data)) {//not having to deal with streams in file_put_contents makes life easier
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$absolutePath = $this->getAbsolutePath($path);
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if (OC_FileProxy::runPreProxies('file_put_contents', $absolutePath, $data) && OC_Filesystem::isValidPath($path)) {
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$path = $this->getRelativePath($absolutePath);
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$exists = $this->file_exists($path);
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$run = true;
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if(!$exists) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_create,
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array(
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OC_Filesystem::signal_param_path => $path,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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}
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_write,
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array(
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OC_Filesystem::signal_param_path => $path,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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if(!$run) {
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return false;
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}
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$target=$this->fopen($path, 'w');
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if($target) {
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$count=OC_Helper::streamCopy($data, $target);
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fclose($target);
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fclose($data);
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if(!$exists) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_create,
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array( OC_Filesystem::signal_param_path => $path)
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);
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}
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_write,
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array( OC_Filesystem::signal_param_path => $path)
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);
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OC_FileProxy::runPostProxies('file_put_contents', $absolutePath, $count);
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return $count > 0;
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}else{
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return false;
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}
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}
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}else{
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return $this->basicOperation('file_put_contents', $path, array('create', 'write'), $data);
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}
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}
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public function unlink($path) {
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return $this->basicOperation('unlink', $path, array('delete'));
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}
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public function deleteAll( $directory, $empty = false ) {
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return $this->basicOperation( 'deleteAll', $directory, array('delete'), $empty );
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}
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public function rename($path1, $path2) {
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$absolutePath1 = $this->getAbsolutePath($path1);
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$absolutePath2 = $this->getAbsolutePath($path2);
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if(OC_FileProxy::runPreProxies('rename', $absolutePath1, $absolutePath2) and OC_Filesystem::isValidPath($path2)) {
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$path1 = $this->getRelativePath($absolutePath1);
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$path2 = $this->getRelativePath($absolutePath2);
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if($path1 == null or $path2 == null) {
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return false;
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}
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$run=true;
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME, OC_Filesystem::signal_rename,
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array(
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OC_Filesystem::signal_param_oldpath => $path1,
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OC_Filesystem::signal_param_newpath => $path2,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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if($run) {
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$mp1 = $this->getMountPoint($path1);
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$mp2 = $this->getMountPoint($path2);
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if($mp1 == $mp2) {
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if($storage = $this->getStorage($path1)) {
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$result = $storage->rename($this->getInternalPath($path1), $this->getInternalPath($path2));
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}
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} else {
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$source = $this->fopen($path1, 'r');
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$target = $this->fopen($path2, 'w');
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$count = OC_Helper::streamCopy($source, $target);
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$storage1 = $this->getStorage($path1);
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$storage1->unlink($this->getInternalPath($path1));
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$result = $count>0;
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}
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_rename,
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array(
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OC_Filesystem::signal_param_oldpath => $path1,
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OC_Filesystem::signal_param_newpath => $path2
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)
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);
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return $result;
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}
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}
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}
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public function copy($path1, $path2) {
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$absolutePath1 = $this->getAbsolutePath($path1);
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$absolutePath2 = $this->getAbsolutePath($path2);
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if(OC_FileProxy::runPreProxies('copy', $absolutePath1, $absolutePath2) and OC_Filesystem::isValidPath($path2)) {
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$path1 = $this->getRelativePath($absolutePath1);
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$path2 = $this->getRelativePath($absolutePath2);
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if($path1 == null or $path2 == null) {
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return false;
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}
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$run=true;
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_copy,
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array(
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OC_Filesystem::signal_param_oldpath => $path1,
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OC_Filesystem::signal_param_newpath=>$path2,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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$exists=$this->file_exists($path2);
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if($run and !$exists) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_create,
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array(
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OC_Filesystem::signal_param_path => $path2,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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}
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if($run) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_write,
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array(
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OC_Filesystem::signal_param_path => $path2,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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}
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if($run) {
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$mp1=$this->getMountPoint($path1);
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$mp2=$this->getMountPoint($path2);
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if($mp1 == $mp2){
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if($storage = $this->getStorage($path1)) {
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$result=$storage->copy($this->getInternalPath($path1), $this->getInternalPath($path2));
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}
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} else {
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$source = $this->fopen($path1, 'r');
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$target = $this->fopen($path2, 'w');
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$result = OC_Helper::streamCopy($source, $target);
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}
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_copy,
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array(
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OC_Filesystem::signal_param_oldpath => $path1,
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OC_Filesystem::signal_param_newpath=>$path2
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)
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);
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if(!$exists) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_create,
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array(OC_Filesystem::signal_param_path => $path2)
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);
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}
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_post_write,
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array( OC_Filesystem::signal_param_path => $path2)
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);
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return $result;
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}
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}
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}
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public function fopen($path, $mode) {
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$hooks=array();
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switch($mode) {
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case 'r':
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case 'rb':
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$hooks[]='read';
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break;
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case 'r+':
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case 'rb+':
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case 'w+':
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case 'wb+':
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case 'x+':
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case 'xb+':
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case 'a+':
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case 'ab+':
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$hooks[]='read';
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$hooks[]='write';
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break;
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case 'w':
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case 'wb':
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case 'x':
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case 'xb':
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case 'a':
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case 'ab':
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$hooks[]='write';
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break;
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default:
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OC_Log::write('core','invalid mode ('.$mode.') for '.$path,OC_Log::ERROR);
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}
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return $this->basicOperation('fopen', $path, $hooks, $mode);
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}
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public function toTmpFile($path) {
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if(OC_Filesystem::isValidPath($path)) {
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$source = $this->fopen($path, 'r');
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if($source) {
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$extension='';
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$extOffset=strpos($path, '.');
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if($extOffset !== false) {
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$extension=substr($path, strrpos($path,'.'));
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}
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$tmpFile = OC_Helper::tmpFile($extension);
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file_put_contents($tmpFile, $source);
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return $tmpFile;
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}
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}
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}
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public function fromTmpFile($tmpFile, $path) {
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if(OC_Filesystem::isValidPath($path)) {
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if(!$tmpFile) {
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debug_print_backtrace();
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}
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$source=fopen($tmpFile, 'r');
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if($source) {
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$this->file_put_contents($path, $source);
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unlink($tmpFile);
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return true;
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} else {
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}
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} else {
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return false;
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}
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}
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public function getMimeType($path) {
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return $this->basicOperation('getMimeType', $path);
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}
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public function hash($type, $path, $raw = false) {
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$absolutePath = $this->getAbsolutePath($path);
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if (OC_FileProxy::runPreProxies('hash', $absolutePath) && OC_Filesystem::isValidPath($path)) {
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$path = $this->getRelativePath($absolutePath);
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if ($path == null) {
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return false;
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}
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if (OC_Filesystem::$loaded && $this->fakeRoot == OC_Filesystem::getRoot()) {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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OC_Filesystem::signal_read,
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array( OC_Filesystem::signal_param_path => $path)
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);
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}
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if ($storage = $this->getStorage($path)) {
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$result = $storage->hash($type, $this->getInternalPath($path), $raw);
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$result = OC_FileProxy::runPostProxies('hash', $absolutePath, $result);
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return $result;
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}
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}
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return null;
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}
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public function free_space($path='/') {
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return $this->basicOperation('free_space', $path);
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}
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/**
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* @brief abstraction layer for basic filesystem functions: wrapper for OC_Filestorage
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* @param string $operation
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* @param string #path
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* @param array (optional) hooks
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* @param mixed (optional) $extraParam
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* @return mixed
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*
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* This method takes requests for basic filesystem functions (e.g. reading & writing
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* files), processes hooks and proxies, sanitises paths, and finally passes them on to
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* OC_Filestorage for delegation to a storage backend for execution
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*/
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private function basicOperation($operation, $path, $hooks=array(), $extraParam=null) {
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$absolutePath = $this->getAbsolutePath($path);
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if(OC_FileProxy::runPreProxies($operation, $absolutePath, $extraParam) and OC_Filesystem::isValidPath($path)) {
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$path = $this->getRelativePath($absolutePath);
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if($path == null) {
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return false;
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}
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$internalPath = $this->getInternalPath($path);
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$run = true;
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if(OC_Filesystem::$loaded and $this->fakeRoot==OC_Filesystem::getRoot()) {
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foreach($hooks as $hook) {
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if($hook!='read') {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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$hook,
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array(
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OC_Filesystem::signal_param_path => $path,
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OC_Filesystem::signal_param_run => &$run
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)
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);
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} else {
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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$hook,
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array( OC_Filesystem::signal_param_path => $path)
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);
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}
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}
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}
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if($run and $storage = $this->getStorage($path)) {
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if(!is_null($extraParam)) {
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$result = $storage->$operation($internalPath, $extraParam);
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} else {
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$result = $storage->$operation($internalPath);
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}
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$result = OC_FileProxy::runPostProxies($operation, $this->getAbsolutePath($path), $result);
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if(OC_Filesystem::$loaded and $this->fakeRoot==OC_Filesystem::getRoot()) {
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if($operation!='fopen') {//no post hooks for fopen, the file stream is still open
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foreach($hooks as $hook) {
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if($hook!='read'){
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OC_Hook::emit(
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OC_Filesystem::CLASSNAME,
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'post_'.$hook,
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array( OC_Filesystem::signal_param_path => $path)
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);
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}
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}
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}
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}
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return $result;
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}
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}
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return null;
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}
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/**
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* check if a file or folder has been updated since $time
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* @param int $time
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* @return bool
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*/
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public function hasUpdated($path, $time) {
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return $this->basicOperation('hasUpdated', $path, array(), $time);
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}
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}
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