461 lines
14 KiB
PHP
461 lines
14 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 $size;
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}
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return false;
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}
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public function is_readable($path){
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return $this->basicOperation('is_readable',$path);
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}
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public function is_writable($path){
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return $this->basicOperation('is_writable',$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($data)){//not having to deal with streams in file_put_contents makes life easier
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$exists=$this->file_exists($path);
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$run=true;
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if(!$exists){
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_create, array( OC_Filesystem::signal_param_path => $path, OC_Filesystem::signal_param_run => &$run));
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}
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_write, array( OC_Filesystem::signal_param_path => $path, OC_Filesystem::signal_param_run => &$run));
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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( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_create, array( OC_Filesystem::signal_param_path => $path));
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}
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_write, array( OC_Filesystem::signal_param_path => $path));
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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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}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 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( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_rename, array( OC_Filesystem::signal_param_oldpath => $path1 , OC_Filesystem::signal_param_newpath=>$path2, OC_Filesystem::signal_param_run => &$run));
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if($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($data,$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( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_rename, array( OC_Filesystem::signal_param_oldpath => $path1, OC_Filesystem::signal_param_newpath=>$path2));
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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( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_copy, array( OC_Filesystem::signal_param_oldpath => $path1 , OC_Filesystem::signal_param_newpath=>$path2, OC_Filesystem::signal_param_run => &$run));
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$exists=$this->file_exists($path2);
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if($run and !$exists){
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_create, array( OC_Filesystem::signal_param_path => $path2, OC_Filesystem::signal_param_run => &$run));
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}
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if($run){
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_write, array( OC_Filesystem::signal_param_path => $path2, OC_Filesystem::signal_param_run => &$run));
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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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$count=OC_Helper::streamCopy($data,$target);
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}
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_copy, array( OC_Filesystem::signal_param_oldpath => $path1 , OC_Filesystem::signal_param_newpath=>$path2));
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if(!$exists){
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_create, array( OC_Filesystem::signal_param_path => $path2));
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}
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OC_Hook::emit( OC_Filesystem::CLASSNAME, OC_Filesystem::signal_post_write, array( OC_Filesystem::signal_param_path => $path2));
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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){
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return $this->basicOperation('hash',$path,array('read'));
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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( OC_Filesystem::CLASSNAME, $hook, array( OC_Filesystem::signal_param_path => $path, OC_Filesystem::signal_param_run => &$run));
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}else{
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OC_Hook::emit( OC_Filesystem::CLASSNAME, $hook, array( OC_Filesystem::signal_param_path => $path));
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}
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}
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}
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if($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( OC_Filesystem::CLASSNAME, 'post_'.$hook, 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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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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