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7282d42f52
- new $user parameter for egw_vfs::check_access($path, $check, $stat=null, $user=null) to check access to a file for a user, who is NOT the current user
257 lines
10 KiB
PHP
257 lines
10 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) 2008-10 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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* Define parent for links_stream_wrapper, if not already defined
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*
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* Allows to base links_stream_wrapper on an other wrapper
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*/
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if (!class_exists('links_stream_wrapper_parent',false))
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{
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class links_stream_wrapper_parent extends sqlfs_stream_wrapper {}
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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://www.php.net/manual/en/function.stream-wrapper-register.php
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*/
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class links_stream_wrapper extends links_stream_wrapper_parent
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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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* Clears our stat-cache
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*
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* Normaly not necessary, as it is automatically cleared/updated, UNLESS egw_vfs::$user changes!
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*
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* We have to clear file_access cache of egw_link, as our ACL depends on it!
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*
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* @param string $path='/apps' to be able to clear only file_access cache of a certain app
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*/
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public static function clearstatcache($path='/apps')
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{
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//error_log(__METHOD__."('$path')");
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if ($path[0] != '/') $path = parse_url($path, PHP_URL_PATH);
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list(,,$app) = explode('/',$path);
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egw_link::delete_cache($app, null); // null = delete only file_access cache, if app implements it, otherwise title cache is deleted too
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// need to call sqlfs clearstatcache too
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parent::clearstatcache($path);
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}
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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,$check)
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{
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if (egw_vfs::$is_root)
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{
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return true;
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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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// 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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// vfs & stream-wrapper use posix rights, egw_link::file_access uses EGW_ACL_{EDIT|READ}!
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$required = $check & egw_vfs::WRITABLE ? EGW_ACL_EDIT : EGW_ACL_READ;
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$access = egw_link::file_access($app,$id,$required,$rel_path);
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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($path[0] != '/')
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{
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if (strpos($path,'?') !== false) $query = parse_url($path,PHP_URL_QUERY);
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$path = parse_url($path,PHP_URL_PATH).($query ? '?'.$query : '');
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}
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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($path,egw_vfs::WRITABLE)) // app directory itself is allways ok
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{
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$current_is_root = egw_vfs::$is_root; egw_vfs::$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 = $current_is_root;
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}
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//error_log(__METHOD__."($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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* This method is called immediately after your stream object is created.
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*
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* Reimplemented from sqlfs to ensure self::url_stat is called, to fill sqlfs stat cache with our eacl!
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*
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* @param string $url URL that was passed to fopen() and that this object is expected to retrieve
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* @param string $mode mode used to open the file, as detailed for fopen()
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* @param int $options additional flags set by the streams API (or'ed together):
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* - STREAM_USE_PATH If path is relative, search for the resource using the include_path.
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* - STREAM_REPORT_ERRORS If this flag is set, you are responsible for raising errors using trigger_error() during opening of the stream.
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* If this flag is not set, you should not raise any errors.
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* @param string $opened_path full path of the file/resource, if the open was successfull and STREAM_USE_PATH was set
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* @return boolean true if the ressource was opened successful, otherwise false
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*/
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function stream_open ( $url, $mode, $options, &$opened_path )
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{
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// the following call is necessary to fill sqlfs_stream_wrapper::$stat_cache, WITH the extendes ACL!
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self::url_stat($url,0);
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return parent::stream_open($url,$mode,$options,$opened_path);
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}
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/**
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* This method is called in response to rename() calls on URL paths associated with the wrapper.
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*
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* Reimplemented to use our own url_stat and unlink function (workaround for no lsb in php < 5.3)
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*
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* @param string $url_from
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* @param string $url_to
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* @param string $class=__CLASS__ class to use to call static methods, eg url_stat (workaround for no late static binding in php < 5.3)
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function rename ( $url_from, $url_to, $class=__CLASS__)
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{
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return parent::rename($url_from,$url_to,$class);
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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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