478 lines
14 KiB
PHP
478 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 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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* Hooks provided:
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* read(path)
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* write(path, &run)
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* post_write(path)
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* create(path, &run) (when a file is created, both create and write will be emited in that order)
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* post_create(path)
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* delete(path, &run)
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* post_delete(path)
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* rename(oldpath,newpath, &run)
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* post_rename(oldpath,newpath)
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* copy(oldpath,newpath, &run) (if the newpath doesn't exists yes, copy, create and write will be emited in that order)
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* post_rename(oldpath,newpath)
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*
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* the &run parameter can be set to false to prevent the operation from occuring
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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 $mounts=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::$storageTypes);
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}
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/**
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* tear down the filesystem, removing all storage providers
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*/
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static public function tearDown(){
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foreach(self::$storages as $mountpoint=>$storage){
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unset(self::$storages[$mountpoint]);
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}
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$fakeRoot='';
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}
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/**
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* create a new storage of a specific type
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* @param string type
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* @param array arguments
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* @return OC_Filestorage
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*/
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static private function createStorage($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==''){
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if($fakeRoot[0]!=='/'){
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$fakeRoot='/'.$fakeRoot;
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}
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}
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self::$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 $internalPath;
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}
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/**
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* mount an OC_Filestorage in our virtual filesystem
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* @param OC_Filestorage storage
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* @param string mountpoint
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*/
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static public function mount($type,$arguments,$mountpoint){
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if(substr($mountpoint,0,1)!=='/'){
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$mountpoint='/'.$mountpoint;
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}
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self::$mounts[$mountpoint]=array('type'=>$type,'arguments'=>$arguments);
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}
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/**
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* get the storage object for a path
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* @param string path
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* @return OC_Filestorage
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*/
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static public function getStorage($path){
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$mountpoint=self::getMountPoint($path);
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if($mountpoint){
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if(!isset(self::$storages[$mountpoint])){
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$mount=self::$mounts[$mountpoint];
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self::$storages[$mountpoint]=self::createStorage($mount['type'],$mount['arguments']);
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}
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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 public 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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$foundMountPoint='';
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foreach(self::$mounts 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 $foundMountPoint;
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}
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/**
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* return the path to a local version of the file
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* we need this because we can't know if a file is stored local or not from outside the filestorage and for some purposes a local file is needed
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* @param string path
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* @return string
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*/
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static public function getLocalFile($path){
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$parent=substr($path,0,strrpos($path,'/'));
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if(self::isValidPath($parent) and $storage=self::getStorage($path)){
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return $storage->getLocalFile(self::getInternalPath($path));
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}
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}
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/**
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* check if the requested path is valid
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* @param string path
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* @return bool
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*/
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static public function isValidPath($path){
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if(substr($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;
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}
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static public function mkdir($path){
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return self::basicOperation('mkdir',$path,array('create','write'));
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}
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static public function rmdir($path){
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return self::basicOperation('rmdir',$path,array('delete'));
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}
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static public function opendir($path){
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return self::basicOperation('opendir',$path,array('read'));
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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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return self::basicOperation('is_dir',$path);
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}
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static public function is_file($path){
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if($path=='/'){
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return false;
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}
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return self::basicOperation('is_file',$path);
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}
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static public function stat($path){
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return self::basicOperation('stat',$path);
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}
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static public function filetype($path){
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return self::basicOperation('filetype',$path);
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}
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static public function filesize($path){
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return self::basicOperation('filesize',$path);
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}
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static public function readfile($path){
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return self::basicOperation('readfile',$path,array('read'));
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}
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static public function is_readable($path){
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return self::basicOperation('is_readable',$path);
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}
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static public function is_writeable($path){
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return self::basicOperation('is_writeable',$path);
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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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return self::basicOperation('file_exists',$path);
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}
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static public function filectime($path){
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return self::basicOperation('filectime',$path);
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}
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static public function filemtime($path){
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return self::basicOperation('filemtime',$path);
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}
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static public function fileatime($path){
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return self::basicOperation('fileatime',$path);
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}
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static public function file_get_contents($path){
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return self::basicOperation('file_get_contents',$path,array('read'));
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}
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static public function file_put_contents($path,$data){
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return self::basicOperation('file_put_contents',$path,array('create','write'),$data);
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}
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static public function unlink($path){
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return self::basicOperation('unlink',$path,array('delete'));
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}
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static public function rename($path1,$path2){
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if(OC_FileProxy::runPreProxies('rename',$path1,$path2) and self::is_writeable($path1) and self::isValidPath($path2)){
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$run=true;
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OC_Hook::emit( 'OC_Filesystem', 'rename', array( 'oldpath' => $path1 ,'newpath'=>$path2, 'run' => &$run));
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if($run){
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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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$result=$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=$storage2->fromTmpFile($tmpFile,self::getInternalPath($path2));
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$storage1->unlink(self::getInternalPath($path1));
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}
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OC_Hook::emit( 'OC_Filesystem', 'post_rename', array( 'oldpath' => $path1, 'newpath'=>$path2));
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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,$path2){
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if(OC_FileProxy::runPreProxies('copy',$path1,$path2) and self::is_readable($path1) and self::isValidPath($path2)){
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$run=true;
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OC_Hook::emit( 'OC_Filesystem', 'copy', array( 'oldpath' => $path1 ,'newpath'=>$path2, 'run' => &$run));
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$exists=self::file_exists($path2);
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if($run and !$exists){
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OC_Hook::emit( 'OC_Filesystem', 'create', array( 'path' => $path2, 'run' => &$run));
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}
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if($run){
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OC_Hook::emit( 'OC_Filesystem', 'write', array( 'path' => $path2, 'run' => &$run));
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}
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if($run){
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$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($path1)){
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$result=$storage->copy(self::getInternalPath($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($path1));
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$result=$storage2->fromTmpFile($tmpFile,self::getInternalPath($path2));
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}
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OC_Hook::emit( 'OC_Filesystem', 'post_copy', array( 'oldpath' => $path1 ,'newpath'=>$path2));
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if(!$exists){
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OC_Hook::emit( 'OC_Filesystem', 'post_create', array( 'path' => $path2));
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}
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OC_Hook::emit( 'OC_Filesystem', 'post_write', array( 'path' => $path2));
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return $result;
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}
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}
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}
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static public function fopen($path,$mode){
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$hooks=array();
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switch($mode){
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case 'r':
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$hooks[]='read';
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break;
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case 'r+':
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case 'w+':
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case 'x+':
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case 'a+':
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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 'x':
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case 'a':
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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 '.$path,OC_Log::ERROR);
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}
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return self::basicOperation('fopen',$path,$hooks,$mode);
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}
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static public function toTmpFile($path){
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if(OC_FileProxy::runPreProxies('toTmpFile',$path) and self::isValidPath($path) and $storage=self::getStorage($path)){
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OC_Hook::emit( 'OC_Filesystem', 'read', array( 'path' => $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(OC_FileProxy::runPreProxies('copy',$tmpFile,$path) and self::isValidPath($path) and $storage=self::getStorage($path)){
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$run=true;
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$exists=self::file_exists($path);
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if(!$exists){
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OC_Hook::emit( 'OC_Filesystem', 'create', array( 'path' => $path, 'run' => &$run));
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}
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if($run){
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OC_Hook::emit( 'OC_Filesystem', 'write', array( 'path' => $path, 'run' => &$run));
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}
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if($run){
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$result=$storage->fromTmpFile($tmpFile,self::getInternalPath($path));
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if(!$exists){
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OC_Hook::emit( 'OC_Filesystem', 'post_create', array( 'path' => $path));
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}
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OC_Hook::emit( 'OC_Filesystem', 'post_write', array( 'path' => $path));
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return $result;
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}
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}
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}
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static public function fromUploadedFile($tmpFile,$path){
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if(OC_FileProxy::runPreProxies('fromUploadedFile',$tmpFile,$path) and self::isValidPath($path) and $storage=self::getStorage($path)){
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$run=true;
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$exists=self::file_exists($path);
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if(!$exists){
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OC_Hook::emit( 'OC_Filesystem', 'create', array( 'path' => $path, 'run' => &$run));
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}
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if($run){
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OC_Hook::emit( 'OC_Filesystem', 'write', array( 'path' => $path, 'run' => &$run));
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}
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if($run){
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$result=$storage->fromUploadedFile($tmpFile,self::getInternalPath($path));
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if(!$exists){
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OC_Hook::emit( 'OC_Filesystem', 'post_create', array( 'path' => $path));
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}
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OC_Hook::emit( 'OC_Filesystem', 'post_write', array( 'path' => $path));
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return $result;
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}
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}
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}
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static public function getMimeType($path){
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return self::basicOperation('getMimeType',$path);
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}
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static public function hash($type,$path){
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return self::basicOperation('hash',$path,array('read'));
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}
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static public function free_space($path='/'){
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return self::basicOperation('free_space',$path);
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}
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static public function search($query){
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$files=array();
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$fakeRoot=self::$fakeRoot;
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$fakeRootLength=strlen($fakeRoot);
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foreach(self::$storages as $mountpoint=>$storage){
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$results=$storage->search($query);
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if(is_array($results)){
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foreach($results as $result){
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$file=str_replace('//','/',$mountpoint.$result);
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if(substr($file,0,$fakeRootLength)==$fakeRoot){
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$file=substr($file,$fakeRootLength);
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$files[]=$file;
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}
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}
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}
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}
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return $files;
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}
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static public function update_session_file_hash($sessionname,$sessionvalue){
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$_SESSION[$sessionname] = $sessionvalue;
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}
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/**
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* abstraction for running most basic operations
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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) $extraParam
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* @return mixed
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*/
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private static function basicOperation($operation,$path,$hooks=array(),$extraParam=null){
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if(OC_FileProxy::runPreProxies($operation,$path, $extraParam) and self::isValidPath($path) and $storage=self::getStorage($path)){
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$interalPath=self::getInternalPath($path);
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$run=true;
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foreach($hooks as $hook){
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if($hook!='read'){
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OC_Hook::emit( 'OC_Filesystem', $hook, array( 'path' => $path, 'run' => &$run));
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}else{
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OC_Hook::emit( 'OC_Filesystem', $hook, array( 'path' => $path));
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}
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}
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if($run){
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if($extraParam){
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$result=$storage->$operation($interalPath,$extraParam);
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}else{
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$result=$storage->$operation($interalPath);
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}
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$result=OC_FileProxy::runPostProxies($operation,$path,$result);
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foreach($hooks as $hook){
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if($hook!='read'){
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OC_Hook::emit( 'OC_Filesystem', 'post_'.$hook, array( 'path' => $path));
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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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