source: plugins/fairTrackbacks/class.dc.filter.fairtrackbacks.php @ 2566:9bf417837888

<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Dotclear 2.
#
# Copyright (c) 2003-2013 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 dcFilterFairTrackbacks extends dcSpamFilter
{
     public $name = 'Fair Trackbacks';
     public $has_gui = false;
     public $active = true;
     public $order = -10;

     public function __construct($core)
     {
          parent::__construct($core);
     }

     protected function setInfo()
     {
          $this->description = __('Checks trackback source for a link to the post');
     }


     public function isSpam($type,$author,$email,$site,$ip,$content,$post_id,&$status)
     {
          if ($type != 'trackback') {
               return;
          }

          try
          {
               $default_parse = array('scheme'=>'','host'=>'','path'=>'','query'=>'');
               $S = array_merge($default_parse,parse_url($site));

               if ($S['scheme'] != 'http' || !$S['host'] || !$S['path']) {
                    throw new Exception('Invalid URL');
               }

               # Check incomink link page
               $post = $this->core->blog->getPosts(array('post_id' => $post_id));
               $post_url = $post->getURL();
               $P = array_merge($default_parse,parse_url($post_url));

               if ($post_url == $site) {
                    throw new Exception('Same source and destination');
               }

               $o = netHttp::initClient($site,$path);
               $o->setTimeout(3);
               $o->get($path);

               # Trackback source does not return 200 status code
               if ($o->getStatus() != 200) {
                    throw new Exception('Invalid Status Code');
               }

               $tb_page = $o->getContent();

               # Do we find a link to post in trackback source?
               if ($S['host'] == $P['host']) {
                    $pattern = $P['path'].($P['query'] ? '?'.$P['query'] : '');
               } else {
                    $pattern = $post_url;
               }
               $pattern = preg_quote($pattern,'/');

               if (!preg_match('/'.$pattern.'/',$tb_page)) {
                    throw new Exception('Unfair');
               }
          }
          catch (Exception $e)
          {
               throw new Exception('Trackback not allowed for this URL.');
          }
     }
}