class.ilObjFileBasedLMAccess.php

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<?php
 
/* Copyright (c) 1998-2011 ILIAS open source, Extended GPL, see docs/LICENSE */
 
include_once("./Services/Object/classes/class.ilObjectAccess.php");
 
class ilObjFileBasedLMAccess extends ilObjectAccess
{
        static $online;
        static $startfile;
 
        function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
        {
                global $ilUser, $lng, $rbacsystem, $ilAccess;
 
                if ($a_user_id == "")
                {
                        $a_user_id = $ilUser->getId();
                }
 
                switch ($a_permission)
                {
                        case "visible":
                                if (!ilObjFileBasedLMAccess::_lookupOnline($a_obj_id) &&
                                        (!$rbacsystem->checkAccessOfUser($a_user_id,'write', $a_ref_id)))
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
                                        return false;
                                }
                                break;
 
                        case "read":
 
                                if ((!ilObjFileBasedLMAccess::_lookupOnline($a_obj_id)
                                        && !$rbacsystem->checkAccessOfUser($a_user_id,'write',$a_ref_id)) ||
                                        ilObjFileBasedLMAccess::_determineStartUrl($a_obj_id) == "")
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
                                        return false;
                                }
                                break;
                }
 
 
                return true;
        }
        
        static function _getCommands()
        {
                $commands = array
                (
                        array("permission" => "read", "cmd" => "view", "lang_var" => "show",
                                "default" => true),
                        array("permission" => "write", "cmd" => "edit", "lang_var" => "edit_content"),
                        array("permission" => "write", "cmd" => "properties", "lang_var" => "settings")
                );
                
                return $commands;
        }
 
        //
        // access relevant methods
        //
 
        static function _lookupOnline($a_id)
        {
                global $ilDB;
 
                if (isset(self::$online[$a_id]))
                {
                        return self::$online[$a_id];
                }
                $q = "SELECT is_online FROM file_based_lm WHERE id = ".$ilDB->quote($a_id, "integer");
                $set = $ilDB->query($q);
                $rec = $ilDB->fetchAssoc($set);
 
                self::$online[$a_id] = ilUtil::yn2tf($rec["is_online"]);
                
                return self::$online[$a_id];
        }
 
        static function _determineStartUrl($a_id)
        {
                global $ilDB;
 
                if (isset(self::$startfile[$a_id]))
                {
                        $start_file = self::$startfile[$a_id];
                }
                else
                {
                        $q = "SELECT startfile FROM file_based_lm WHERE id = ".$ilDB->quote($a_id, "integer");
                        $set = $ilDB->query($q);
                        $rec = $ilDB->fetchAssoc($set);
                        $start_file = $rec["startfile"];
                        self::$startfile[$a_id] = $start_file."";
                }
                
                $dir = ilUtil::getWebspaceDir()."/lm_data/lm_".$a_id;
                
                if (($start_file != "") &&
                        (@is_file($dir."/".$start_file)))
                {
                        return "./".$dir."/".$start_file;
                }
                else if (@is_file($dir."/index.html"))
                {
                        return "./".$dir."/index.html";
                }
                else if (@is_file($dir."/index.htm"))
                {
                        return "./".$dir."/index.htm";
                }
 
                return "";
        }
 
        static function _checkGoto($a_target)
        {
                global $ilAccess;
                
                $t_arr = explode("_", $a_target);
 
                if ($t_arr[0] != "htlm" || ((int) $t_arr[1]) <= 0)
                {
                        return false;
                }
 
                if ($ilAccess->checkAccess("visible", "", $t_arr[1]) ||
                        $ilAccess->checkAccess("read", "", $t_arr[1]))
                {
                        return true;
                }
                return false;
        }
 
        static function _lookupDiskUsage($a_id)
        {
                $lm_data_dir = ilUtil::getWebspaceDir('filesystem')."/lm_data";
                $lm_dir = $lm_data_dir.DIRECTORY_SEPARATOR."lm_".$a_id;
                
                return file_exists($lm_dir) ? ilUtil::dirsize($lm_dir) : 0;             
        }
 
        static function _isOffline($a_obj_id)
        {
                return !self::_lookupOnline($a_obj_id);
        }
        
        static function _preloadData($a_obj_ids, $a_ref_ids)
        {
                global $ilDB, $ilUser;
                
                $q = "SELECT id, is_online, startfile FROM file_based_lm WHERE ".
                        $ilDB->in("id", $a_obj_ids, false, "integer");
 
                $lm_set = $ilDB->query($q);
                while ($rec = $ilDB->fetchAssoc($lm_set))
                {
                        self::$online[$rec["id"]] = ilUtil::yn2tf($rec["is_online"]);
                        self::$startfile[$rec["id"]] = $rec["startfile"]."";
                }
        }
 
}
 
?>