nextcloud/lib/filesystem.php

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<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @copyright 2010 Frank Karlitschek karlitschek@kde.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* Class for abstraction of filesystem functions
* This class won't call any filesystem functions for itself but but will pass them to the correct OC_FILESTORAGE object
* this class should also handle all the file premission related stuff
*
* Hooks provided:
* read(path)
* write(path)
* create(path) (when a file is created both, write and create will be emited)
* delete(path)
* rename(oldpath,newpath)
*/
class OC_FILESYSTEM{
static private $storages=array();
static private $fakeRoot='';
static private $storageTypes=array();
/**
* register a storage type
* @param string type
* @param string classname
* @param array arguments an associative array in the form of name=>type (eg array('datadir'=>'string'))
*/
static public function registerStorageType($type,$classname,$arguments){
self::$storageTypes[$type]=array('type'=>$type,'classname'=>$classname,'arguments'=>$arguments);
}
/**
* check if the filesystem supports a specific storagetype
* @param string type
* @return bool
*/
static public function hasStorageType($type){
return isset(self::$storageTypes[$type]);
}
/**
* get the list of names of storagetypes that the filesystem supports
* @return array
*/
static public function getStorageTypeNames(){
return array_keys(self::$storageTypes);
}
/**
* create a new storage of a specific type
* @param string type
* @param array arguments
* @return OC_FILESTORAGE
*/
static public function createStorage($type,$arguments){
if(!self::hasStorageType($type)){
return false;
}
$className=self::$storageTypes[$type]['classname'];
if(class_exists($className)){
return new $className($arguments);
}else{
return false;
}
}
/**
* change the root to a fake toor
* @param string fakeRoot
* @return bool
*/
static public function chroot($fakeRoot){
if($fakeRoot[0]!=='/'){
$fakeRoot='/'.$fakeRoot;
}
self::$fakeRoot=$fakeRoot;
}
/**
* get the part of the path relative to the mountpoint of the storage it's stored in
* @param string path
* @return bool
*/
static public function getInternalPath($path){
$mountPoint=self::getMountPoint($path);
$path=self::$fakeRoot.$path;
$internalPath=substr($path,strlen($mountPoint));
return $internalPath;
}
/**
* check if the current users has the right premissions to read a file
* @param string path
* @return bool
*/
static private function canRead($path){
if(substr($path,0,1)!=='/'){
$path='/'.$path;
}
if(strstr($path,'/../') || strrchr($path, '/') === '/..' ){
return false;
}
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
}
/**
* check if the current users has the right premissions to write a file
* @param string path
* @return bool
*/
static private function canWrite($path){
if(substr($path,0,1)!=='/'){
$path='/'.$path;
}
if(strstr($path,'/../') || strrchr($path, '/') === '/..' ){
return false;
}
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
}
/**
* mount an OC_FILESTORAGE in our virtual filesystem
* @param OC_FILESTORAGE storage
* @param string mountpoint
*/
static public function mount($storage,$mountpoint){
if(substr($mountpoint,0,1)!=='/'){
$mountpoint='/'.$mountpoint;
}
self::$storages[self::$fakeRoot.$mountpoint]=$storage;
}
/**
* get the storage object for a path
* @param string path
* @return OC_FILESTORAGE
*/
static private function getStorage($path){
$mountpoint=self::getMountPoint($path);
if($mountpoint){
return self::$storages[$mountpoint];
}
}
/**
* get the mountpoint of the storage object for a path
( note: because a storage is not always mounted inside the fakeroot, the returned mountpoint is relative to the absolute root of the filesystem and doesn't take the chroot into account
*
* @param string path
* @return string
*/
static private function getMountPoint($path){
if(!$path){
$path='/';
}
if(substr($path,0,1)!=='/'){
$path='/'.$path;
}
if(substr($path,-1)!=='/'){
$path=$path.'/';
}
$path=self::$fakeRoot.$path;
$foundMountPoint='';
foreach(self::$storages as $mountpoint=>$storage){
if(substr($mountpoint,-1)!=='/'){
$mountpoint=$mountpoint.'/';
}
if($mountpoint==$path){
return $mountpoint;
}
if(strpos($path,$mountpoint)===0 and strlen($mountpoint)>strlen($foundMountPoint)){
$foundMountPoint=$mountpoint;
}
}
return $foundMountPoint;
}
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/**
* return the path to a local version of the file
* we need this because we can't know if a file is stored local or not from outside the filestorage and for some purposes a local file is needed
* @param string path
* @return string
*/
static public function getLocalFile($path){
$parent=substr($path,0,strrpos($path,'/'));
if(self::canRead($parent) and $storage=self::getStorage($path)){
return $storage->getLocalFile(self::getInternalPath($path));
}
}
static public function mkdir($path){
$parent=substr($path,0,strrpos($path,'/'));
if(self::canWrite($parent) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
return $storage->mkdir(self::getInternalPath($path));
}
}
static public function rmdir($path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'delete', array( 'path' => $path));
return $storage->rmdir(self::getInternalPath($path));
}
}
static public function opendir($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
return $storage->opendir(self::getInternalPath($path));
}
}
static public function is_dir($path){
if($path=='/'){
return true;
}
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->is_dir(self::getInternalPath($path));
}
}
static public function is_file($path){
if($path=='/'){
return false;
}
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->is_file(self::getInternalPath($path));
}
}
static public function stat($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->stat(self::getInternalPath($path));
}
}
static public function filetype($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->filetype(self::getInternalPath($path));
}
}
static public function filesize($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->filesize(self::getInternalPath($path));
}
}
static public function readfile($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
return $storage->readfile(self::getInternalPath($path));
}
}
static public function is_readable($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->is_readable(self::getInternalPath($path));
}
return false;
}
static public function is_writeable($path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
return $storage->is_writeable(self::getInternalPath($path));
}
return false;
}
static public function file_exists($path){
if($path=='/'){
return true;
}
if(self::canWrite($path) and $storage=self::getStorage($path)){
return $storage->file_exists(self::getInternalPath($path));
}
return false;
}
static public function filectime($path){
if($storage=self::getStorage($path)){
return $storage->filectime(self::getInternalPath($path));
}
}
static public function filemtime($path){
if($storage=self::getStorage($path)){
return $storage->filemtime(self::getInternalPath($path));
}
}
static public function fileatime($path){
if($storage=self::getStorage($path)){
return $storage->fileatime(self::getInternalPath($path));
}
}
static public function file_get_contents($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
return $storage->file_get_contents(self::getInternalPath($path));
}
}
static public function file_put_contents($path,$data){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'write', array( 'path' => $path));
if(!self::file_exists($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
}
return $storage->file_put_contents(self::getInternalPath($path),$data);
}
}
static public function unlink($path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'delete', array( 'path' => $path));
return $storage->unlink(self::getInternalPath($path));
}
}
static public function rename($path1,$path2){
if(self::canWrite($path1) and self::canWrite($path2)){
$mp1=self::getMountPoint($path1);
$mp2=self::getMountPoint($path2);
if($mp1==$mp2){
if($storage=self::getStorage($path1)){
return $storage->rename(self::getInternalPath($path1),self::getInternalPath($path2));
}
}elseif($storage1=self::getStorage($path1) and $storage2=self::getStorage($path2)){
$tmpFile=$storage1->toTmpFile(self::getInternalPath($path1));
$result=$storage2->fromTmpFile(self::getInternalPath($path2));
$storage1->unlink(self::getInternalPath($path1));
return $result;
}
OC_HOOK::emit( 'OC_FILESYSTEM', 'rename', array( 'oldpath' => $path1 ,'newpath'=>$path2));
}
}
static public function copy($path1,$path2){
if(self::canRead($path1) and self::canWrite($path2)){
$mp1=self::getMountPoint($path1);
$mp2=self::getMountPoint($path2);
if($mp1==$mp2){
if($storage=self::getStorage($path1)){
return $storage->copy(self::getInternalPath($path1),self::getInternalPath($path2));
}
}elseif($storage1=self::getStorage($path1) and $storage2=self::getStorage($path2)){
$tmpFile=$storage1->toTmpFile(self::getInternalPath($path1));
return $storage2->fromTmpFile(self::getInternalPath($path2));
}
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path2));
}
}
static public function fopen($path,$mode){
$allowed=((strpos($path,'r')===false and strpos($path,'r+')!==false and self::canRead) or self::canWrite($path));
if($allowed){
if($storage=self::getStorage($path)){
switch($mode){
case 'r':
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
break;
case 'r+':
case 'w+':
case 'x+':
case 'a+':
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
OC_HOOK::emit( 'OC_FILESYSTEM', 'write', array( 'path' => $path));
if(!self::file_exists($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
}
break;
case 'w':
case 'x':
case 'a':
OC_HOOK::emit( 'OC_FILESYSTEM', 'write', array( 'path' => $path));
if(!self::file_exists($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
}
break;
}
return $storage->fopen(self::getInternalPath($path),$mode);
}
}
}
static public function toTmpFile($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
return $storage->toTmpFile(self::getInternalPath($path));
}
}
static public function fromTmpFile($tmpFile,$path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'write', array( 'path' => $path));
if(!self::file_exists($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
}
return $storage->fromTmpFile($tmpFile,self::getInternalPath($path));
}
}
static public function fromUploadedFile($tmpFile,$path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'write', array( 'path' => $path));
if(!self::file_exists($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'create', array( 'path' => $path));
}
return $storage->fromUploadedFile($tmpFile,self::getInternalPath($path));
}
}
static public function getMimeType($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->getMimeType(self::getInternalPath($path));
}
}
static public function delTree($path){
if(self::canWrite($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'delete', array( 'path' => $path));
return $storage->delTree(self::getInternalPath($path));
}
}
static public function find($path){
if($storage=self::getStorage($path)){
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$mp=self::getMountPoint($path);
$return=$storage->find(self::getInternalPath($path));
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foreach($return as &$file){
$file=$mp.$file;
}
}
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return $return;
}
static public function getTree($path){
if(self::canRead($path) and $storage=self::getStorage($path)){
$mp=self::getMountPoint($path);
$return=$storage->getTree(self::getInternalPath($path));
foreach($return as &$file){
if(substr($file,0,1)=='/'){
$file=substr($file,1);
}
$file=$mp.$file;
$file=substr($file,strlen(self::$fakeRoot));
if($file === '' || $file === false){
$file = '/';
}
}
return $return;
}
}
static public function hash($type,$path,$raw=false){
if(self::canRead($path) and $storage=self::getStorage($path)){
OC_HOOK::emit( 'OC_FILESYSTEM', 'read', array( 'path' => $path));
return $storage->hash($type,self::getInternalPath($path),$raw);
}
}
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static public function free_space($path='/'){
if(self::canRead($path) and $storage=self::getStorage($path)){
return $storage->free_space($path);
}
}
}
?>