[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * Handle Trackbacks and Pingbacks sent to WordPress
   4   *
   5   * @package WordPress
   6   */
   7  
   8  if (empty($wp)) {
   9      require_once ('./wp-load.php');
  10      wp('tb=1');
  11  }
  12  
  13  /**
  14   * trackback_response() - Respond with error or success XML message
  15   *
  16   * @param int|bool $error Whether there was an error or not
  17   * @param string $error_message Error message if an error occurred
  18   */
  19  function trackback_response($error = 0, $error_message = '') {
  20      header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
  21      if ($error) {
  22          echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
  23          echo "<response>\n";
  24          echo "<error>1</error>\n";
  25          echo "<message>$error_message</message>\n";
  26          echo "</response>";
  27          die();
  28      } else {
  29          echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
  30          echo "<response>\n";
  31          echo "<error>0</error>\n";
  32          echo "</response>";
  33      }
  34  }
  35  
  36  // trackback is done by a POST
  37  $request_array = 'HTTP_POST_VARS';
  38  
  39  if ( !isset($_GET['tb_id']) || !$_GET['tb_id'] ) {
  40      $tb_id = explode('/', $_SERVER['REQUEST_URI']);
  41      $tb_id = intval( $tb_id[ count($tb_id) - 1 ] );
  42  }
  43  
  44  $tb_url  = isset($_POST['url'])     ? $_POST['url']     : '';
  45  $charset = isset($_POST['charset']) ? $_POST['charset'] : '';
  46  
  47  // These three are stripslashed here so that they can be properly escaped after mb_convert_encoding()
  48  $title     = isset($_POST['title'])     ? stripslashes($_POST['title'])      : '';
  49  $excerpt   = isset($_POST['excerpt'])   ? stripslashes($_POST['excerpt'])    : '';
  50  $blog_name = isset($_POST['blog_name']) ? stripslashes($_POST['blog_name'])  : '';
  51  
  52  if ($charset)
  53      $charset = str_replace( array(',', ' '), '', strtoupper( trim($charset) ) );
  54  else
  55      $charset = 'ASCII, UTF-8, ISO-8859-1, JIS, EUC-JP, SJIS';
  56  
  57  // No valid uses for UTF-7
  58  if ( false !== strpos($charset, 'UTF-7') )
  59      die;
  60  
  61  if ( function_exists('mb_convert_encoding') ) { // For international trackbacks
  62      $title     = mb_convert_encoding($title, get_option('blog_charset'), $charset);
  63      $excerpt   = mb_convert_encoding($excerpt, get_option('blog_charset'), $charset);
  64      $blog_name = mb_convert_encoding($blog_name, get_option('blog_charset'), $charset);
  65  }
  66  
  67  // Now that mb_convert_encoding() has been given a swing, we need to escape these three
  68  $title     = $wpdb->escape($title);
  69  $excerpt   = $wpdb->escape($excerpt);
  70  $blog_name = $wpdb->escape($blog_name);
  71  
  72  if ( is_single() || is_page() )
  73      $tb_id = $posts[0]->ID;
  74  
  75  if ( !isset($tb_id) || !intval( $tb_id ) )
  76      trackback_response(1, 'I really need an ID for this to work.');
  77  
  78  if (empty($title) && empty($tb_url) && empty($blog_name)) {
  79      // If it doesn't look like a trackback at all...
  80      wp_redirect(get_permalink($tb_id));
  81      exit;
  82  }
  83  
  84  if ( !empty($tb_url) && !empty($title) ) {
  85      header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
  86  
  87      if ( !pings_open($tb_id) )
  88          trackback_response(1, 'Sorry, trackbacks are closed for this item.');
  89  
  90      $title =  wp_html_excerpt( $title, 250 ).'...';
  91      $excerpt = wp_html_excerpt( $excerpt, 252 ).'...';
  92  
  93      $comment_post_ID = (int) $tb_id;
  94      $comment_author = $blog_name;
  95      $comment_author_email = '';
  96      $comment_author_url = $tb_url;
  97      $comment_content = "<strong>$title</strong>\n\n$excerpt";
  98      $comment_type = 'trackback';
  99  
 100      $dupe = $wpdb->get_results( $wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_author_url = %s", $comment_post_ID, $comment_author_url) );
 101      if ( $dupe )
 102          trackback_response(1, 'We already have a ping from that URL for this post.');
 103  
 104      $commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type');
 105  
 106      wp_new_comment($commentdata);
 107  
 108      do_action('trackback_post', $wpdb->insert_id);
 109      trackback_response(0);
 110  }
 111  ?>