class.ilObjGroupReferenceAccess.php

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<?php

class ilObjGroupReferenceAccess extends ilContainerReferenceAccess
{
    public function _checkAccess(string $cmd, string $permission, int $ref_id, int $obj_id, ?int $user_id = null): bool
    {
        global $DIC;

        $ilAccess = $DIC['ilAccess'];

        switch ($permission) {
            case 'visible':
            case 'read':
                $target_ref_id = (int) ilObjGroupReference::_lookupTargetRefId($obj_id);

                if (!$target_ref_id || !$ilAccess->checkAccessOfUser($user_id, $permission, $cmd, $target_ref_id)) {
                    return false;
                }
                break;
        }

        return true;
    }

    public static function _getCommands($a_ref_id = 0): array
    {
        global $DIC;

        $ilAccess = $DIC['ilAccess'];

        if ($ilAccess->checkAccess('write', '', $a_ref_id)) {
            // Only local (reference specific commands)
            $commands = array(
                array("permission" => "visible", "cmd" => "", "lang_var" => "show","default" => true),
                array("permission" => "write", "cmd" => "editReference", "lang_var" => "edit")
            );
        } else {
            $commands = ilObjGroupAccess::_getCommands();
        }
        return $commands;
    }
}