mirror of
https://github.com/EGroupware/egroupware.git
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186 lines
6.9 KiB
PHP
186 lines
6.9 KiB
PHP
<?php
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/**
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* eGroupWare API: VFS - stream wrapper for linked files
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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: class.sqlfs_stream_wrapper.inc.php 24997 2008-03-02 21:44:15Z ralfbecker $
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*/
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/**
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* eGroupWare API: stream wrapper for linked files
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*
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* The files stored by the sqlfs_stream_wrapper in a /apps/$app/$id directory
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*
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* The links stream wrapper extends the sqlfs one, to implement an own ACL based on the access
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* of the entry the files are linked to.
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*
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* Applications can define a 'file_access' method in the link registry with the following signature:
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*
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* boolean function file_access(string $id,int $check,string $rel_path)
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*
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* If the do not implement such a function the title function is used to test if the user has
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* at least read access to an entry, and if true full (write) access to the files is granted.
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*
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* The stream wrapper interface is according to the docu on php.net
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*
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* @link http://de.php.net/manual/de/function.stream-wrapper-register.php
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*/
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class links_stream_wrapper extends sqlfs_stream_wrapper
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{
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/**
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* Scheme / protocoll used for this stream-wrapper
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*/
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const SCHEME = 'links';
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/**
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* Prefix to predend to get an url from a path
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*/
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const PREFIX = 'links://default';
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/**
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* Base url to store links
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*/
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const BASEURL = 'links://default/apps';
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/**
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* Enable some debug output to the error_log
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*/
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const DEBUG = false;
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/**
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* Implements ACL based on the access of the user to the entry the files are linked to.
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*
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* @param string $url url to check
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* @param int $check mode to check: one or more or'ed together of: 4 = read, 2 = write, 1 = executable
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* @return boolean
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*/
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static function check_extended_acl($url,$check)
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{
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$path = parse_url($url,PHP_URL_PATH);
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list(,$apps,$app,$id,$rel_path) = explode('/',$path,5);
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if ($apps != 'apps')
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{
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$access = false; // no access to anything, but /apps
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}
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elseif (!$app)
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{
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$access = !($check & egw_vfs::WRITABLE); // always grant read access to /apps
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}
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elseif(!isset($GLOBALS['egw_info']['user']['apps'][$app]))
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{
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$access = false; // user has no access to the $app application
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}
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elseif (!$id)
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{
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$access = true; // grant read&write access to /apps/$app
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}
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// allow applications to implement their own access control to the file storage
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elseif(($method = egw_link::get_registry($app,'file_access')))
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{
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$access = ExecMethod2($method,$id,$check,$rel_path);
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}
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// otherwise use the title method to check if user has (at least read access) to the entry
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// which gives him then read AND write access to the file store of the entry
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else
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{
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$access = !!egw_link::title($app,$id);
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}
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if (self::DEBUG) error_log(__METHOD__."($url,$check) ".($access?"access granted ($app:$id:$rel_path)":'no access!!!'));
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return $access;
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}
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/**
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* This method is called in response to stat() calls on the URL paths associated with the wrapper.
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*
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* Reimplemented from sqlfs, as we have to pass the value of check_extends_acl(), due to the lack of late static binding.
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*
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* @param string $path
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* @param int $flags holds additional flags set by the streams API. It can hold one or more of the following values OR'd together:
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* - STREAM_URL_STAT_LINK For resources with the ability to link to other resource (such as an HTTP Location: forward,
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* or a filesystem symlink). This flag specified that only information about the link itself should be returned,
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* not the resource pointed to by the link.
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* This flag is set in response to calls to lstat(), is_link(), or filetype().
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* - STREAM_URL_STAT_QUIET If this flag is set, your wrapper should not raise any errors. If this flag is not set,
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* you are responsible for reporting errors using the trigger_error() function during stating of the path.
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* stat triggers it's own warning anyway, so it makes no sense to trigger one by our stream-wrapper!
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* @return array
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*/
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static function url_stat ( $url, $flags )
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{
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return parent::url_stat($url,$flags,self::check_extended_acl($url,egw_vfs::READABLE));
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}
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/**
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* Set or delete extended acl for a given path and owner (or delete them if is_null($rights)
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*
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* Reimplemented, to NOT call the sqlfs functions, as we dont allow to modify the ACL (defined by the apps)
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*
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* @param string $path string with path
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* @param int $rights=null rights to set, or null to delete the entry
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* @param int/boolean $owner=null owner for whom to set the rights, null for the current user, or false to delete all rights for $path
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* @param int $fs_id=null fs_id to use, to not query it again (eg. because it's already deleted)
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* @return boolean true if acl is set/deleted, false on error
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*/
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static function eacl($path,$rights=null,$owner=null,$fs_id=null)
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{
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return false;
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}
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/**
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* Get all ext. ACL set for a path
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*
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* Reimplemented, to NOT call the sqlfs functions, as we dont allow to modify the ACL (defined by the apps)
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*
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* @param string $path
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* @return array/boolean array with array('path'=>$path,'owner'=>$owner,'rights'=>$rights) or false if $path not found
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*/
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function get_eacl($path)
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{
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return false;
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}
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/**
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* mkdir for links
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*
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* Reimplemented as we have no static late binding to allow the extended sqlfs to call our eacl and to set no default rights for entry dirs
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*
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* This method is called in response to mkdir() calls on URL paths associated with the wrapper.
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*
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* It should attempt to create the directory specified by path.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support creating directories.
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*
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* @param string $path
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* @param int $mode not used(!), we inherit 005 for /apps/$app and set 000 for /apps/$app/$id
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* @param int $options Posible values include STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE, we allways use recursive!
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function mkdir($path,$mode,$options)
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{
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if($path[0] != '/') $path = parse_url($path,PHP_URL_PATH);
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list(,$apps,$app,$id,$rel_path) = explode('/',$path,5);
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$ret = false;
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if ($apps == 'apps' && $app && !$id || self::check_extended_acl($path,egw_vfs::WRITABLE)) // app directory itself is allways ok
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{
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egw_vfs::$is_root = true;
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$current_user = egw_vfs::$user; egw_vfs::$user = 0;
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$ret = parent::mkdir($path,0,$options|STREAM_MKDIR_RECURSIVE);
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if ($id) parent::chmod($path,0); // no other rights
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egw_vfs::$user = $current_user;
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egw_vfs::$is_root = false;
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}
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//error_log(__METHOD__."($path,$mode,$options) apps=$apps, app=$app, id=$id: returning $ret");
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return $ret;
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}
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}
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stream_register_wrapper(links_stream_wrapper::SCHEME ,'links_stream_wrapper');
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