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385 lines
12 KiB
385 lines
12 KiB
<?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 2010 Frank Karlitschek karlitschek@kde.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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/**
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* Class for abstraction of filesystem functions
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* This class won't call any filesystem functions for itself but but will pass them to the correct OC_FILESTORAGE object
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* this class should also handle all the file premission related stuff
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*/
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class OC_FILESYSTEM{
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static private $storages=array();
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static private $fakeRoot='';
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static private $storageTypes=array();
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/**
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* register a storage type
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* @param string type
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* @param string classname
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* @param array arguments an associative array in the form of name=>type (eg array('datadir'=>'string'))
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*/
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static public function registerStorageType($type,$classname,$arguments){
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self::$storageTypes[$type]=array('type'=>$type,'classname'=>$classname,'arguments'=>$arguments);
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}
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/**
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* check if the filesystem supports a specific storagetype
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* @param string type
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* @return bool
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*/
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static public function hasStorageType($type){
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return isset(self::$storageTypes[$type]);
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}
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/**
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* get the list of names of storagetypes that the filesystem supports
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* @return array
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*/
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static public function getStorageTypeNames(){
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return array_keys(self::$storageTypes);
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}
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/**
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* create a new storage of a specific type
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* @param string type
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* @param array arguments
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* @return OC_FILESTORAGE
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*/
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static public function createStorage($type,$arguments){
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if(!self::hasStorageType($type)){
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return false;
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}
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$className=self::$storageTypes[$type]['classname'];
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if(class_exists($className)){
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return new $className($arguments);
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}else{
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return false;
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}
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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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static public function chroot($fakeRoot){
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if($fakeRoot[0]!=='/'){
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$fakeRoot='/'.$fakeRoot;
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}
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self::$fakeRoot=$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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static public function getInternalPath($path){
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$mountPoint=self::getMountPoint($path);
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$path=self::$fakeRoot.$path;
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$internalPath=substr($path,strlen($mountPoint));
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return $internalPath;
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}
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/**
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* check if the current users has the right premissions to read a file
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* @param string path
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* @return bool
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*/
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static private function canRead($path){
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if(substr($path,0,1)!=='/'){
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$path='/'.$path;
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}
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if(strstr($path,'/../') || strrchr($path, '/') === '/..' ){
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return false;
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}
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return true;//dummy untill premissions are correctly implemented, also the correcty value because for now users are locked in their seperate data dir and can read/write everything in there
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}
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/**
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* check if the current users has the right premissions to write a file
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* @param string path
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* @return bool
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*/
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static private function canWrite($path){
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if(substr($path,0,1)!=='/'){
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$path='/'.$path;
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}
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if(strstr($path,'/../') || strrchr($path, '/') === '/..' ){
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return false;
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}
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return true;//dummy untill premissions are correctly implemented, also the correcty value because for now users are locked in their seperate data dir and can read/write everything in there
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}
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/**
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* mount an OC_FILESTORAGE in our virtual filesystem
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* @param OC_FILESTORAGE storage
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* @param string mountpoint
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*/
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static public function mount($storage,$mountpoint){
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if(substr($mountpoint,0,1)!=='/'){
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$mountpoint='/'.$mountpoint;
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}
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self::$storages[self::$fakeRoot.$mountpoint]=$storage;
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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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static private function getStorage($path){
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$mountpoint=self::getMountPoint($path);
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if($mountpoint){
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return self::$storages[$mountpoint];
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}
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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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static private function getMountPoint($path){
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if(!$path){
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$path='/';
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}
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if(substr($path,0,1)!=='/'){
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$path='/'.$path;
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}
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if(substr($path,-1)!=='/'){
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$path=$path.'/';
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}
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$path=self::$fakeRoot.$path;
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$foundMountPoint='';
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foreach(self::$storages as $mountpoint=>$storage){
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if(substr($mountpoint,-1)!=='/'){
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$mountpoint=$mountpoint.'/';
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}
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if($mountpoint==$path){
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return $mountpoint;
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}
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if(strpos($path,$mountpoint)===0 and strlen($mountpoint)>strlen($foundMountPoint)){
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$foundMountPoint=$mountpoint;
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}
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}
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return $foundMountPoint;
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}
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static public function mkdir($path){
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$parent=substr($path,0,strrpos($path,'/'));
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if(self::canWrite($parent) and $storage=self::getStorage($path)){
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return $storage->mkdir(self::getInternalPath($path));
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}
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}
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static public function rmdir($path){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->rmdir(self::getInternalPath($path));
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}
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}
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static public function opendir($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->opendir(self::getInternalPath($path));
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}
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}
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static 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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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->is_dir(self::getInternalPath($path));
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}
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}
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static 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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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->is_file(self::getInternalPath($path));
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}
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}
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static public function stat($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->stat(self::getInternalPath($path));
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}
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}
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static public function filetype($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->filetype(self::getInternalPath($path));
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}
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}
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static public function filesize($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->filesize(self::getInternalPath($path));
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}
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}
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static public function readfile($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->readfile(self::getInternalPath($path));
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}
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}
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static public function is_readable($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->is_readable(self::getInternalPath($path));
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}
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return false;
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}
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static public function is_writeable($path){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->is_writeable(self::getInternalPath($path));
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}
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return false;
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}
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static 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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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->file_exists(self::getInternalPath($path));
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}
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return false;
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}
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static public function filectime($path){
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if($storage=self::getStorage($path)){
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return $storage->filectime(self::getInternalPath($path));
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}
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}
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static public function filemtime($path){
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if($storage=self::getStorage($path)){
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return $storage->filemtime(self::getInternalPath($path));
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}
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}
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static public function fileatime($path){
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if($storage=self::getStorage($path)){
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return $storage->fileatime(self::getInternalPath($path));
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}
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}
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static public function file_get_contents($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->file_get_contents(self::getInternalPath($path));
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}
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}
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static public function file_put_contents($path,$data){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->file_put_contents(self::getInternalPath($path),$data);
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}
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}
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static public function unlink($path){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->unlink(self::getInternalPath($path));
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}
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}
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static public function rename($path1,$path2){
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if(self::canWrite($path1) and self::canWrite($path2)){
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$mp1=self::getMountPoint($path1);
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$mp2=self::getMountPoint($path2);
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if($mp1==$mp2){
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if($storage=self::getStorage($path1)){
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return $storage->rename(self::getInternalPath($path1),self::getInternalPath($path2));
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}
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}elseif($storage1=self::getStorage($path1) and $storage2=self::getStorage($path2)){
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$tmpFile=$storage1->toTmpFile(self::getInternalPath($path1));
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$result=$storage2->fromTmpFile(self::getInternalPath($path2));
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$storage1->unlink(self::getInternalPath($path1));
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return $result;
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}
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}
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}
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static public function copy($path1,$path2){
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if(self::canRead($path1) and self::canWrite($path2)){
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$mp1=self::getMountPoint($path1);
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$mp2=self::getMountPoint($path2);
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if($mp1==$mp2){
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if($storage=self::getStorage($path1)){
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return $storage->copy(self::getInternalPath($path1),self::getInternalPath($path2));
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}
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}elseif($storage1=self::getStorage($path1) and $storage2=self::getStorage($path2)){
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$tmpFile=$storage1->toTmpFile(self::getInternalPath($path1));
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return $storage2->fromTmpFile(self::getInternalPath($path2));
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}
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}
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}
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static public function fopen($path,$mode){
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$allowed=((strpos($path,'r')===false and strpos($path,'r+')!==false and self::canRead) or self::canWrite($path));
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if($allowed){
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if($storage=self::getStorage($path)){
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return $storage->fopen(self::getInternalPath($path),$mode);
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}
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}
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}
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static public function toTmpFile($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->toTmpFile(self::getInternalPath($path));
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}
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}
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static public function fromTmpFile($tmpFile,$path){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->fromTmpFile($tmpFile,self::getInternalPath($path));
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}
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}
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static public function getMimeType($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->getMimeType(self::getInternalPath($path));
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}
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}
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static public function delTree($path){
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if(self::canWrite($path) and $storage=self::getStorage($path)){
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return $storage->delTree(self::getInternalPath($path));
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}
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}
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static public function find($path){
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if($storage=self::getStorage($path)){
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$mp=self::getMountPoint($path);
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$return=$storage->find(self::getInternalPath($path));
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foreach($return as &$file){
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$file=$mp.$file;
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}
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}
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return $return;
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}
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static public function getTree($path){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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$mp=self::getMountPoint($path);
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$return=$storage->getTree(self::getInternalPath($path));
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foreach($return as &$file){
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if(substr($file,0,1)=='/'){
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$file=substr($file,1);
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}
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$file=$mp.$file;
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$file=substr($file,strlen(self::$fakeRoot));
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if($file === '' || $file === false){
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$file = '/';
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}
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}
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return $return;
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}
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}
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static public function hash($type,$path,$raw=false){
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if(self::canRead($path) and $storage=self::getStorage($path)){
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return $storage->hash($type,self::getInternalPath($path),$raw);
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}
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}
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}
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?>
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