class.ilLicenseAccess.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilLicenseAccess
{
        static function _isEnabled()
        {
                static $enabled;

                if (isset($enabled))
                {
                        return $enabled;
                }

                $lic_set = new ilSetting("license");
                if ($lic_set->get("license_counter"))
                {
                        $enabled = true;
                        return true;
                }
                else
                {
                        $enabled = false;
                        return false;
                }
        }
        
        
        static function _checkAccess($a_usr_id, $a_obj_id)
        {
                global $ilDB, $ilUser;

                // check the object license
                $query = 'SELECT licenses, used FROM license_data WHERE obj_id = %s';
                $result = $ilDB->queryF($query, array('integer'), array($a_obj_id));

                if ($row = $ilDB->fetchObject($result))
                {
                        // no licenses set or at least one free => grant access
                        if ($row->licenses == 0
                        or  $row->used < $row->licenses)
                        {
                                return true;
                        }
                }
                else
                {
                        // no license data available => access granted
                        return true;
                }

                // check if user has already accessed
                $query = 'SELECT read_count FROM read_event '
                                .'WHERE usr_id = %s AND obj_id = %s';
                        
                $result = $ilDB->queryF($query,
                                                array('integer','integer'),
                                                array($a_usr_id, $a_obj_id));
                                                
                if ($row = $ilDB->fetchObject($result))
                {
                        return true;
                }
                
                // all failed
                return false;
        }
}
                
?>