source: plugins/antispam/filters/class.dc.filter.linkslookup.php @ 913:dda0e8b497de

<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Antispam, a plugin for Dotclear 2.
#
# Copyright (c) 2003-2011 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

class dcFilterLinksLookup extends dcSpamFilter
{
     public $name = 'Links Lookup';
     
     private $server = 'multi.surbl.org';
     
     protected function setInfo()
     {
          $this->description = __('Checks links in comments against surbl.org');
     }
     
     public function getStatusMessage($status,$comment_id)
     {
          return sprintf(__('Filtered by %1$s with server %2$s.'),$this->guiLink(),$status);
     }
     
     public function isSpam($type,$author,$email,$site,$ip,$content,$post_id,&$status)
     {
          if (!$ip || long2ip(ip2long($ip)) != $ip) {
               return;
          }
          
          $urls = $this->getLinks($content);
          array_unshift($urls,$site);
          
          foreach ($urls as $u)
          {
               $b = parse_url($u);
               if (!isset($b['host']) || !$b['host']) {
                    continue;
               }

               $domain = preg_replace('/^[\w]{2,6}:\/\/([\w\d\.\-]+).*$/','$1',$b['host']);
               $domain_elem = explode(".",$domain);

               $i = count($domain_elem) - 1;
               $host = $domain_elem[$i];
               do
               {
                    $host = $domain_elem[$i - 1].'.'.$host;
                    $i--;
                    if (substr(gethostbyname($host.'.'.$this->server),0,3) == "127" ) 
                    {
                         $status = substr($domain,0,128);
                         return true;
                    }                   
               } while ($i > 0);
          }
     }
     
     private function getLinks($text)
     {
          $res = array();
          
          # href attribute on "a" tags
          if (preg_match_all('/<a ([^>]+)>/ms', $text, $match, PREG_SET_ORDER))
          {
               for ($i = 0; $i<count($match); $i++)
               {
                    if (preg_match('/href="(http:\/\/[^"]+)"/ms', $match[$i][1], $matches)) {
                         $res[] = $matches[1];
                    }
               }
          }
          
          return $res;
     }
}
?>