mirror of
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289 lines
9.0 KiB
PHP
289 lines
9.0 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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const EXECUTABLE = 4;
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const READABLE = 2;
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const WRITABLE = 1;
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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 (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 (!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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* 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 $check mode to check: 4 = read, 2 = write, 1 = executable
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* @return boolean
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*/
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static function check_access($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 (!$stat)
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{
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//error_log(__METHOD__."(stat[name]={$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'] & $check)
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{
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error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via other rights!");
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return true;
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}
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// check if there's owner access and we are the owner
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if (($stat['mode'] & ($check << 6)) && $stat['uid'] && $stat['uid'] == $GLOBALS['egw_info']['user']['account_id'])
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{
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//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via owner rights!");
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return true;
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}
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// check if there's a group access and we have the right membership
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if (($stat['mode'] & ($check << 3)) && $stat['gid'])
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{
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static $memberships;
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if (is_null($memberships))
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{
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$memberships = $GLOBALS['egw']->accounts->memberships($GLOBALS['egw_info']['user']['account_id'],true);
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}
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if (in_array(-abs($stat['gid']),$memberships))
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{
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//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) access via group rights!");
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return true;
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}
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}
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// here could be a check for extended acls ...
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//error_log(__METHOD__."(stat[name]={$stat['name']},stat[mode]=".sprintf('%o',$stat['mode']).",$check) no access!");
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return false;
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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 $path
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* @return boolean
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*/
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static function is_writable($path)
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{
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return self::is_readable($path,2);
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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 $path
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* @return boolean
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*/
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static function is_executable($path)
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{
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return self::is_readable($path,1);
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}
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/**
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* Private constructor to prevent instanciating this class, only it's static methods should be used
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*/
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private function __construct()
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{
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}
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}
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