class.ilRobotSettings.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilRobotSettings
{
        private $open_robots = false;
        private $settings = null;
        
        private static $instance = null;
        private function __construct()
        {
                global $ilSetting;
                
                $this->settings = $ilSetting;
                $this->read();
        }
        
        public static function _getInstance()
        {
                if(isset(self::$instance) and self::$instance)
                {
                        return self::$instance;
                }
                else
                {
                        return self::$instance = new ilRobotSettings();
                }
        }
        
        public function robotSupportEnabled()
        {
                return (bool) $this->open_robots;
        }
        
        private function read()
        {
                $this->open_robots = (bool) $this->settings->get('open_google',false);
        }

        
        public function checkRewrite()
        {
                if(!function_exists('apache_lookup_uri'))
                {
                        return true;
                }
                
                $url = ILIAS_HTTP_PATH.'/goto_'.CLIENT_ID.'_root_1.html';
                $status_info = @apache_lookup_uri($url);
                
                // fallback for php as cgi (and available remote fopen)
                if($status_info === false && ini_get('allow_url_fopen'))
                {               
                        // fopen respects HTTP error codes 
                        $fp = @fopen($url, 'r');                        
                        if($fp)
                        {
                                fclose($fp);
                                return true;                            
                        }
                        return false;
                }
                
                return $status_info->status == 200;
        }
}


?>