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;
    }
}