mirror of
https://github.com/EGroupware/egroupware.git
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677 lines
19 KiB
PHP
677 lines
19 KiB
PHP
<?php
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/**
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* eGroupWare API: VFS - static methods to use the new eGW virtual file system
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage vfs
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2008 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* Class containing static methods to use the new eGW virtual file system
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*
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* This extension of the vfs stream-wrapper allows to use the following static functions,
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* which only allow access to the eGW VFS and need no 'vfs://default' prefix for filenames:
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*
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* - resource egw_vfs::fopen($path,$mode) like fopen, returned resource can be used with fwrite etc.
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* - resource egw_vfs::opendir($path) like opendir, returned resource can be used with readdir etc.
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* - boolean egw_vfs::copy($from,$to) like copy
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* - boolean egw_vfs::rename($old,$new) renaming or moving a file in the vfs
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* - boolean egw_vfs::mkdir($path) creating a new dir in the vfs
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* - boolean egw_vfs::rmdir($path) removing (an empty) directory
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* - boolean egw_vfs::unlink($path) removing a file
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* - boolean egw_vfs::touch($path,$mtime=null) touch a file
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* - boolean egw_vfs::stat($path) returning status of file like stat(), but only with string keys (no numerical indexes)!
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*
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* With the exception of egw_vfs::touch() (not yet part of the stream_wrapper interface)
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* you can always use the standard php functions, if you add a 'vfs://default' prefix
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* to every filename or path. Be sure to always add the prefix, as the user otherwise gains
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* access to the real filesystem of the server!
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*
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* The two following methods can be used to persitently mount further filesystems (without editing the code):
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*
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* - boolean/array egw_vfs::mount($url,$path) to mount $ur on $path or to return the fstab when called without argument
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* - boolean egw_vfs::umount($path) to unmount a path or url
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*
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* The stream wrapper interface allows to access hugh files in junks to not be limited by the
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* memory_limit setting of php. To do you should path a resource to the opened file and not the content:
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*
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* $file = egw_vfs::fopen('/home/user/somefile','r');
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* $content = fread($file,1024);
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*
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* You can also attach stream filters, to eg. base64 encode or compress it on the fly,
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* without the need to hold the content of the whole file in memmory.
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*
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* If you want to copy a file, you can use stream_copy_to_stream to do a copy of a file far bigger then
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* php's memory_limit:
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*
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* $from = egw_vfs::fopen('/home/user/fromfile','r');
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* $to = egw_vfs::fopen('/home/user/tofile','w');
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*
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* stream_copy_to_stream($from,$to);
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*
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* The static egw_vfs::copy() method does exactly that, but you have to do it eg. on your own, if
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* you want to copy eg. an uploaded file into the vfs.
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*/
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class egw_vfs extends vfs_stream_wrapper
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{
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/**
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* Readable bit, for dirs traversable
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*/
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const READABLE = 4;
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/**
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* Writable bit, for dirs delete or create files in that dir
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*/
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const WRITABLE = 2;
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/**
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* Excecutable bit, here only use to check if user is allowed to search dirs
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*/
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const EXECUTABLE = 1;
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/**
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* Current user has root rights, no access checks performed!
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*
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* @var boolean
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*/
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static $is_root = false;
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/**
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* Current user id, in case we ever change if away from $GLOBALS['egw_info']['user']['account_id']
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*
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* @var int
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*/
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static $user;
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/**
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* fopen working on just the eGW VFS
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*
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* @param string $path filename with absolute path in the eGW VFS
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* @param string $mode 'r', 'w', ... like fopen
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* @return resource
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*/
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static function fopen($path,$mode)
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{
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if ($path[0] != '/')
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{
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throw new egw_exception_assertion_failed("Filename '$path' is not an absolute path!");
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}
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return fopen(self::SCHEME.'://default'.$path);
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}
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/**
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* opendir working on just the eGW VFS
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*
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* @param string $path filename with absolute path in the eGW VFS
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* @return resource
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*/
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static function opendir($path)
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{
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if ($path[0] != '/')
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{
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throw new egw_exception_assertion_failed("Directory '$path' is not an absolute path!");
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}
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return opendir(self::SCHEME.'://default'.$path);
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}
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/**
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* copy working on just the eGW VFS
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*
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* @param string $from
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* @param string $to
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* @return boolean
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*/
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static function copy($from,$to)
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{
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$ret = false;
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if (($from_fp = self::fopen($from,'r')) &&
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($to_fp = self::fopen($to,'w')))
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{
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$ret = stream_copy_to_stream($from,$to) !== false;
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}
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if ($from_fp)
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{
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fclose($from_fp);
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}
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if ($to_fp)
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{
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fclose($to_fp);
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}
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return $ret;
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}
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/**
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* stat working on just the eGW VFS (alias of url_stat)
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*
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* @param string $path filename with absolute path in the eGW VFS
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* @return resource
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*/
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static function stat($path)
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{
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if ($path[0] != '/')
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{
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throw new egw_exception_assertion_failed("File '$path' is not an absolute path!");
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}
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return self::url_stat($path,0);
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}
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/**
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* Mounts $url under $path in the vfs, called without parameter it returns the fstab
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*
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* The fstab is stored in the eGW configuration and used for all eGW users.
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*
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* @param string $url=null url of the filesystem to mount, eg. oldvfs://default/
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* @param string $path=null path to mount the filesystem in the vfs, eg. /
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* @return array/boolean array with fstab, if called without parameter or true on successful mount
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*/
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static function mount($url=null,$path=null)
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{
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if (is_null($url) || is_null($path))
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{
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return self::$fstab;
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}
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if (!self::$is_root)
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{
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return false; // only root can mount
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}
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if (isset(self::$fstab[$path]))
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{
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return true; // already mounted
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}
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if (stat($url) === false && opendir($url) === false)
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{
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return false; // url does not exist
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}
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self::$fstab[$path] = $url;
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uksort(self::$fstab,create_function('$a,$b','return strlen($a)-strlen($b);'));
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config::save_value('vfs_fstab',self::$fstab,'phpgwapi');
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$GLOBALS['egw_info']['server']['vfs_fstab'] = self::$fstab;
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return true;
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}
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/**
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* Unmounts a filesystem part of the vfs
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*
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* @param string $path url or path of the filesystem to unmount
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*/
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static function umount($path)
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{
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if (!self::$is_root)
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{
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return false; // only root can mount
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}
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if (!isset(self::$fstab[$path]) && ($path = array_search($path,self::$fstab)) === false)
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{
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return false; // $path not mounted
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}
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unset(self::$fstab[$path]);
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config::save_value('vfs_fstab',self::$fstab,'phpgwapi');
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$GLOBALS['egw_info']['server']['vfs_fstab'] = self::$fstab;
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return true;
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}
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/**
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* find = recursive search over the filesystem
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*
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* @param string/array $base base of the search
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* @param array $options=null the following keys are allowed:
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* - type => {d|f} d=dirs, f=files, default both
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* - dirs_last => {true|false(default)} put the dirs behind the files they contain
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* - name,path => pattern with *,? wildcards, eg. "*.php"
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* - name_preg,path_preg => preg regular expresion, eg. "/(vfs|wrapper)/"
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* - uid,user,gid,group,nouser,nogroup file belongs to user/group with given name or (numerical) id
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* - mime => type[/subtype]
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* - empty,size => (+|-|)N
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* - cmin/mmin => (+|-|)N file/dir create/modified in the last N minutes
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* - ctime/mtime => (+|-|)N file/dir created/modified in the last N days
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* @param string/array/true $exec=null function to call with each found file or dir as first param or
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* true to return file => stat pairs
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* @param array $exec_params=null further params for exec as array, path is always the first param!
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* @return array of pathes if no $exec, otherwise path => stat pairs
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*/
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function find($base,$options=null,$exec=null,$exec_params=null)
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{
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//error_log(__METHOD__."(".print_r($base,true).",".print_r($options,true).",".print_r($exec,true).",".print_r($exec_params,true).")\n");
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$type = $options['type']; // 'd' or 'f'
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$dirs_last = $options['dirs_last']; // list dirs after the files they contain
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// process some of the options (need to be done only once)
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if (isset($options['name']) && !isset($options['name_preg'])) // change from simple *,? wildcards to preg regular expression once
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{
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$options['name_preg'] = '/^'.str_replace(array('\\?','\\*'),array('.{1}','.*'),preg_quote($options['name'])).'$/';
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}
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if (isset($options['path']) && !isset($options['preg_path'])) // change from simple *,? wildcards to preg regular expression once
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{
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$options['path_preg'] = '/^'.str_replace(array('\\?','\\*'),array('.{1}','.*'),preg_quote($options['path'])).'$/';
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}
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if (!isset($options['uid']))
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{
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if (isset($options['user']))
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{
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$options['uid'] = $GLOBALS['egw']->accounts->name2id($options['user'],'account_lid','u');
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}
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elseif (isset($options['nouser']))
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{
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$options['uid'] = 0;
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}
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}
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if (!isset($options['gid']))
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{
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if (isset($options['group']))
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{
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$options['gid'] = abs($GLOBALS['egw']->accounts->name2id($options['group'],'account_lid','g'));
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}
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elseif (isset($options['nogroup']))
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{
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$options['gid'] = 0;
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}
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}
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if (!is_array($base))
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{
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$base = array($base);
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}
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foreach($base as $path)
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{
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// check our fstab if we need to add some of the mountpoints
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$basepath = parse_url($path,PHP_URL_PATH);
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foreach(self::$fstab as $mounted => $src_url)
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{
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if (dirname($mounted) == $basepath)
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{
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$base[] = $mounted;
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}
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}
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}
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$result = array();
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foreach($base as $path)
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{
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$is_dir = is_dir($path);
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if (!$dirs_last || !$is_dir)
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{
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self::_check_add($options,$path,$result);
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}
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if ($is_dir && ($dir = opendir($path)))
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{
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while($file = readdir($dir))
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{
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$file = $path.'/'.$file;
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self::_check_add($options,$file,$result);
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if (is_dir($file))
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{
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foreach(self::find($file,$options,true) as $p => $s)
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{
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unset($result[$p]);
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$result[$p] = $s;
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}
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}
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}
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closedir($dir);
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if ($dirs_last)
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{
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self::_check_add($options,$path,$result);
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}
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}
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}
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//_debug_array($result);
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if ($exec !== true && is_callable($exec))
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{
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if (!is_array($exec_params))
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{
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$exec_params = is_null($exec_params) ? array() : array($exec_params);
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}
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foreach($result as $path => &$stat)
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{
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$options = $exec_params;
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array_unshift($options,$path);
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//echo "calling ".print_r($exec,true).print_r($options,true)."\n";
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$stat = call_user_func_array($exec,$options);
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}
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return $result;
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}
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if ($exec !== true)
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{
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return array_keys($result);
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}
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return $result;
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}
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/**
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* Function carying out the various (optional) checks, before files&dirs get returned as result of find
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*
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* @param array $options options, see egw_vfs::find(,$options)
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* @param string $path name of path to add
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* @param array &$result here we add the stat for the key $path, if the checks are successful
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*/
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private function _check_add($options,$path,&$result)
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{
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$type = $options['type']; // 'd' or 'f'
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if ($type && ($type == 'd') !== is_dir($path))
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{
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return; // wrong type
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}
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if (!($stat = self::url_stat($path,0)))
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{
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return; // not found, should not happen
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}
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if (isset($options['name_preg']) && !preg_match($options['name_preg'],basename($path)) ||
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isset($options['path_preg']) && !preg_match($options['path_preg'],$path))
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{
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return; // wrong name or path
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}
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if (isset($options['gid']) && $stat['gid'] != $options['gid'] ||
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isset($options['uid']) && $stat['uid'] != $options['uid'])
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{
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return; // wrong user or group
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}
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if (isset($options['mime']) && $options['mime'] != ($mime = self::mime_content_type($path)))
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{
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list($type,$subtype) = explode('/',$options['mime']);
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// no subtype (eg. 'image') --> check only the main type
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if ($sub_type || substr($mime,0,strlen($type)+1) != $type.'/')
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{
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return; // wrong mime-type
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}
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}
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if (isset($options['size']) && !self::_check_num($stat['size'],$options['size']) ||
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(isset($options['empty']) && !!$options['empty'] !== !$stat['size']))
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{
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return; // wrong size
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}
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if (isset($options['cmin']) && !self::_check_num(round((time()-$stat['ctime'])/60),$options['cmin']) ||
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isset($options['mmin']) && !self::_check_num(round((time()-$stat['mtime'])/60),$options['mmin']) ||
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isset($options['ctime']) && !self::_check_num(round((time()-$stat['ctime'])/86400),$options['ctime']) ||
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isset($options['mtime']) && !self::_check_num(round((time()-$stat['ctime'])/86400),$options['mtime']))
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{
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return; // not create/modified in the spezified time
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}
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$result[$path] = $stat;
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}
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private function _check_num($value,$argument)
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{
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if (is_int($argument) && $argument >= 0 || $argument[0] != '-' && $argument[0] != '+')
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{
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//echo "_check_num($value,$argument) check = == ".(int)($value == $argument)."\n";
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return $value == $argument;
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}
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if ($argument < 0)
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{
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//echo "_check_num($value,$argument) check < == ".(int)($value < abs($argument))."\n";
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return $value < abs($argument);
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}
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//echo "_check_num($value,$argument) check > == ".(int)($value > (int)substr($argument,1))."\n";
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return $value > (int) substr($argument,1);
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}
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/**
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* Recursiv remove all given url's, including it's content if they are files
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*
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* @param string/array $urls url or array of url's
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* @return array
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*/
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static function remove($urls)
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{
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return self::find($urls,array('dirs_last'=>true),array(__CLASS__,'_rm_rmdir'));
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}
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/**
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* Helper function for remove: either rmdir or unlink given url (depending if it's a dir or file)
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*
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* @param string $url
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* @return boolean
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*/
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static function _rm_rmdir($url)
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{
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if (is_dir($url))
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{
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return rmdir($url);
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}
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return unlink($url);
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}
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/**
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* The stream_wrapper interface checks is_{readable|writable|executable} against the webservers uid,
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* which is wrong in case of our vfs, as we use the current users id and memberships
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*
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* @param string $path
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* @param int $check=4 mode to check: 4 = read, 2 = write, 1 = executable
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* @return boolean
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*/
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static function is_readable($path,$check = 4)
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{
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if (!($stat = self::stat($path)))
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{
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return false;
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}
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return self::check_access($stat,$check);
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}
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/**
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* The stream_wrapper interface checks is_{readable|writable|executable} against the webservers uid,
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* which is wrong in case of our vfs, as we use the current users id and memberships
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*
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* @param array $stat
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* @param int $check mode to check: one or more or'ed together of: 4 = read, 2 = write, 1 = executable
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* @return boolean
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*/
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static function check_access($stat,$check)
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{
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//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check)");
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if (self::$is_root)
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{
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return true;
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}
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if (!$stat)
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{
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//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) no stat array!");
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return false; // file not found
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}
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// check if other rights grant access
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if (($stat['mode'] & $check) == $check)
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{
|
|
//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via other rights!");
|
|
return true;
|
|
}
|
|
// check if there's owner access and we are the owner
|
|
if (($stat['mode'] & ($check << 6)) == ($check << 6) && $stat['uid'] && $stat['uid'] == self::$user)
|
|
{
|
|
//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via owner rights!");
|
|
return true;
|
|
}
|
|
// check if there's a group access and we have the right membership
|
|
if (($stat['mode'] & ($check << 3)) == ($check << 3) && $stat['gid'])
|
|
{
|
|
static $memberships;
|
|
if (is_null($memberships))
|
|
{
|
|
$memberships = $GLOBALS['egw']->accounts->memberships(self::$user,true);
|
|
}
|
|
if (in_array(-abs($stat['gid']),$memberships))
|
|
{
|
|
//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via group rights!");
|
|
return true;
|
|
}
|
|
}
|
|
// here could be a check for extended acls ...
|
|
|
|
//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) no access!");
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* The stream_wrapper interface checks is_{readable|writable|executable} against the webservers uid,
|
|
* which is wrong in case of our vfs, as we use the current users id and memberships
|
|
*
|
|
* @param string $path
|
|
* @return boolean
|
|
*/
|
|
static function is_writable($path)
|
|
{
|
|
return self::is_readable($path,2);
|
|
}
|
|
|
|
/**
|
|
* The stream_wrapper interface checks is_{readable|writable|executable} against the webservers uid,
|
|
* which is wrong in case of our vfs, as we use the current users id and memberships
|
|
*
|
|
* @param string $path
|
|
* @return boolean
|
|
*/
|
|
static function is_executable($path)
|
|
{
|
|
return self::is_readable($path,1);
|
|
}
|
|
|
|
/**
|
|
* Private constructor to prevent instanciating this class, only it's static methods should be used
|
|
*/
|
|
private function __construct()
|
|
{
|
|
|
|
}
|
|
|
|
/**
|
|
* Convert a symbolic mode string or octal mode to an integer
|
|
*
|
|
* @param string/int $set comma separated mode string to set [ugo]+[+=-]+[rwx]+
|
|
* @param int $mode=0 current mode of the file, necessary for +/- operation
|
|
* @return int
|
|
*/
|
|
static function mode2int($set,$mode=0)
|
|
{
|
|
if (is_int($set)) // already an integer
|
|
{
|
|
return $set;
|
|
}
|
|
if (is_numeric($set)) // octal string
|
|
{
|
|
//error_log(__METHOD__."($set,$mode) returning ".(int)base_convert($set,8,10));
|
|
return (int)base_convert($set,8,10); // convert octal to decimal
|
|
}
|
|
foreach(explode(',',$set) as $s)
|
|
{
|
|
if (!preg_match($use='/^([ugoa]*)([+=-]+)([rwx]+)$/',$s,$matches))
|
|
{
|
|
$use = str_replace(array('/','^','$','(',')'),'',$use);
|
|
throw new egw_exception_wrong_userinput("$s is not an allowed mode, use $use !");
|
|
}
|
|
$base = (strpos($matches[3],'r') !== false ? self::READABLE : 0) |
|
|
(strpos($matches[3],'w') !== false ? self::WRITABLE : 0) |
|
|
(strpos($matches[3],'x') !== false ? self::EXECUTABLE : 0);
|
|
|
|
for($n = $m = 0; $n < strlen($matches[1]); $n++)
|
|
{
|
|
switch($matches[1][$n])
|
|
{
|
|
case 'o':
|
|
$m |= $base;
|
|
break;
|
|
case 'g':
|
|
$m |= $base << 3;
|
|
break;
|
|
case 'u':
|
|
$m |= $base << 6;
|
|
break;
|
|
default:
|
|
case 'a':
|
|
$m = $base | ($base << 3) | ($base << 6);
|
|
}
|
|
}
|
|
switch($matches[2])
|
|
{
|
|
case '+':
|
|
$mode |= $m;
|
|
break;
|
|
case '=':
|
|
$mode = $m;
|
|
break;
|
|
case '-':
|
|
$mode &= ~$m;
|
|
}
|
|
}
|
|
//error_log(__METHOD__."($set,) returning ".sprintf('%o',$mode));
|
|
return $mode;
|
|
}
|
|
|
|
/**
|
|
* Convert a numerical mode to a symbolic mode-string
|
|
*
|
|
* @param int $mode
|
|
* @return string
|
|
*/
|
|
static function int2mode( $mode )
|
|
{
|
|
if($mode & 0x1000) // FIFO pipe
|
|
{
|
|
$sP = 'p';
|
|
}
|
|
elseif($mode & 0x2000) // Character special
|
|
{
|
|
$sP = 'c';
|
|
}
|
|
elseif($mode & 0x4000) // Directory
|
|
{
|
|
$sP = 'd';
|
|
}
|
|
elseif($mode & 0x6000) // Block special
|
|
{
|
|
$sP = 'b';
|
|
}
|
|
elseif($mode & 0x8000) // Regular
|
|
{
|
|
$sP = '-';
|
|
}
|
|
elseif($mode & 0xA000) // Symbolic Link
|
|
{
|
|
$sP = 'l';
|
|
}
|
|
elseif($mode & 0xC000) // Socket
|
|
{
|
|
$sP = 's';
|
|
}
|
|
else // UNKNOWN
|
|
{
|
|
$sP = 'u';
|
|
}
|
|
|
|
// owner
|
|
$sP .= (($mode & 0x0100) ? 'r' : '-') .
|
|
(($mode & 0x0080) ? 'w' : '-') .
|
|
(($mode & 0x0040) ? (($mode & 0x0800) ? 's' : 'x' ) :
|
|
(($mode & 0x0800) ? 'S' : '-'));
|
|
|
|
// group
|
|
$sP .= (($mode & 0x0020) ? 'r' : '-') .
|
|
(($mode & 0x0010) ? 'w' : '-') .
|
|
(($mode & 0x0008) ? (($mode & 0x0400) ? 's' : 'x' ) :
|
|
(($mode & 0x0400) ? 'S' : '-'));
|
|
|
|
// world
|
|
$sP .= (($mode & 0x0004) ? 'r' : '-') .
|
|
(($mode & 0x0002) ? 'w' : '-') .
|
|
(($mode & 0x0001) ? (($mode & 0x0200) ? 't' : 'x' ) :
|
|
(($mode & 0x0200) ? 'T' : '-'));
|
|
|
|
return $sP;
|
|
}
|
|
}
|
|
|
|
egw_vfs::$user = (int) $GLOBALS['egw_info']['user']['account_id'];
|