class.ilObjContentObjectAccess.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 ilObjContentObjectAccess extends ilObjectAccess
{
        static $online;
        static $lo_access;
        
        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_cmd)
                {
                        case "view":
 
                                if(!ilObjContentObjectAccess::_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 "continue":
                        
                                // no continue command for anonymous user
                                if ($ilUser->getId() == ANONYMOUS_USER_ID)
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("lm_no_continue_for_anonym"));
                                        return false;
                                }
                        
                                if(!ilObjContentObjectAccess::_lookupOnline($a_obj_id)
                                        && !$rbacsystem->checkAccessOfUser($a_user_id,'write',$a_ref_id))
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
                                        return false;
                                }
 
                                if (ilObjContentObjectAccess::_getLastAccessedPage($a_ref_id,$a_user_id) <= 0)
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("not_accessed_yet"));
                                        return false;
                                }
                                break;
                                
                        // for permission query feature
                        case "info":
                                if(!ilObjContentObjectAccess::_lookupOnline($a_obj_id))
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
                                }
                                else
                                {
                                        $ilAccess->addInfoItem(IL_STATUS_MESSAGE, $lng->txt("online"));
                                }
                                break;
 
                }
 
                switch ($a_permission)
                {
                        case "read":
                        case "visible":
                                if (!ilObjContentObjectAccess::_lookupOnline($a_obj_id) &&
                                        (!$rbacsystem->checkAccessOfUser($a_user_id,'write', $a_ref_id)))
                                {
                                        $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
                                        return false;
                                }
                                break;
                }
 
 
                return true;
        }
 
        //
        // access relevant methods
        //
 
        function _lookupOnline($a_id)
        {
                global $ilDB;
 
                if (isset(self::$online[$a_id]))
                {
                        return self::$online[$a_id];
                }
 
                $q = "SELECT is_online FROM content_object WHERE id = ".$ilDB->quote($a_id, "integer");
                $lm_set = $ilDB->query($q);
                $lm_rec = $ilDB->fetchAssoc($lm_set);
 
                self::$online[$a_id] = ilUtil::yn2tf($lm_rec["is_online"]);
                return ilUtil::yn2tf($lm_rec["is_online"]);
        }
 
        function _getLastAccessedPage($a_ref_id, $a_user_id = "")
        {
                global $ilDB, $ilUser;
                
                if ($a_user_id == "")
                {
                        $a_user_id = $ilUser->getId();
                }
 
                if (isset(self::$lo_access[$a_ref_id]))
                {
                        $acc_rec["obj_id"] = self::$lo_access[$a_ref_id];
                }
                else
                {
                        $q = "SELECT * FROM lo_access WHERE ".
                                "usr_id = ".$ilDB->quote($a_user_id, "integer")." AND ".
                                "lm_id = ".$ilDB->quote($a_ref_id, "integer");
        
                        $acc_set = $ilDB->query($q);
                        $acc_rec = $ilDB->fetchAssoc($acc_set);
                }
                
                if ($acc_rec["obj_id"] > 0)
                {
                        $lm_id = ilObject::_lookupObjId($a_ref_id);
                        $mtree = new ilTree($lm_id);
                        $mtree->setTableNames('lm_tree','lm_data');
                        $mtree->setTreeTablePK("lm_id");
                        if ($mtree->isInTree($acc_rec["obj_id"]))
                        {
                                return $acc_rec["obj_id"];
                        }
                }
                
                return 0;
        }
 
        function _checkGoto($a_target)
        {
                global $ilAccess;
                
                $t_arr = explode("_", $a_target);
 
                if (($t_arr[0] != "lm" &&  $t_arr[0] != "dbk" &&  $t_arr[0] != "st"
                        &&  $t_arr[0] != "pg")
                        || ((int) $t_arr[1]) <= 0)
                {
                        return false;
                }
 
                if ($t_arr[0] == "lm" || $t_arr[0] == "dbk")
                {
                        if ($ilAccess->checkAccess("read", "", $t_arr[1]) ||
                                $ilAccess->checkAccess("visible", "", $t_arr[1]))
                        {
                                return true;
                        }
                }
                else
                {
                        if ($t_arr[2] > 0)
                        {
                                $ref_ids = array($t_arr[2]);
                        }
                        else
                        {
                                // determine learning object
                                include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                                $lm_id = ilLMObject::_lookupContObjID($t_arr[1]);
                                $ref_ids = ilObject::_getAllReferences($lm_id);
                        }
                        // check read permissions
                        foreach ($ref_ids as $ref_id)
                        {
                                // Permission check
                                if ($ilAccess->checkAccess("read", "", $ref_id))
                                {
                                        return true;
                                }
                        }
 
                }
                return false;
        }
        
        static function _isOffline($a_obj_id)
        {
                return !self::_lookupOnline($a_obj_id);
        }
        
        function _preloadData($a_obj_ids, $a_ref_ids)
        {
                global $ilDB, $ilUser;
                
                $q = "SELECT id, is_online FROM content_object 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"]);
                }
                
                $q = "SELECT obj_id, lm_id FROM lo_access WHERE ".
                        "usr_id = ".$ilDB->quote($ilUser->getId(), "integer")." AND ".
                        $ilDB->in("lm_id", $a_ref_ids, false, "integer");;
                $set = $ilDB->query($q);
                foreach ($a_ref_ids as $r)
                {
                        self::$lo_access[$r] = 0;
                }
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        self::$lo_access[$rec["lm_id"]] = $rec["obj_id"];
                }
 
        }
 
}
 
?>