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- <?php
- /**
- * Handle Trackbacks and Pingbacks sent to WordPress
- *
- * @package WordPress
- */
-
- if (empty($wp)) {
- require_once('./wp-load.php');
- wp('tb=1');
- }
-
- /**
- * trackback_response() - Respond with error or success XML message
- *
- * @param int|bool $error Whether there was an error or not
- * @param string $error_message Error message if an error occurred
- */
- function trackback_response($error = 0, $error_message = '') {
- header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
- if ($error) {
- echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
- echo "<response>\n";
- echo "<error>1</error>\n";
- echo "<message>$error_message</message>\n";
- echo "</response>";
- die();
- } else {
- echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
- echo "<response>\n";
- echo "<error>0</error>\n";
- echo "</response>";
- }
- }
-
- // trackback is done by a POST
- $request_array = 'HTTP_POST_VARS';
-
- if ( !$_GET['tb_id'] ) {
- $tb_id = explode('/', $_SERVER['REQUEST_URI']);
- $tb_id = intval( $tb_id[ count($tb_id) - 1 ] );
- }
-
- $tb_url = $_POST['url'];
- $charset = $_POST['charset'];
-
- // These three are stripslashed here so that they can be properly escaped after mb_convert_encoding()
- $title = stripslashes($_POST['title']);
- $excerpt = stripslashes($_POST['excerpt']);
- $blog_name = stripslashes($_POST['blog_name']);
-
- if ($charset)
- $charset = strtoupper( trim($charset) );
- else
- $charset = 'ASCII, UTF-8, ISO-8859-1, JIS, EUC-JP, SJIS';
-
- // No valid uses for UTF-7
- if ( false !== strpos($charset, 'UTF-7') )
- die;
-
- if ( function_exists('mb_convert_encoding') ) { // For international trackbacks
- $title = mb_convert_encoding($title, get_option('blog_charset'), $charset);
- $excerpt = mb_convert_encoding($excerpt, get_option('blog_charset'), $charset);
- $blog_name = mb_convert_encoding($blog_name, get_option('blog_charset'), $charset);
- }
-
- // Now that mb_convert_encoding() has been given a swing, we need to escape these three
- $title = $wpdb->escape($title);
- $excerpt = $wpdb->escape($excerpt);
- $blog_name = $wpdb->escape($blog_name);
-
- if ( is_single() || is_page() )
- $tb_id = $posts[0]->ID;
-
- if ( !intval( $tb_id ) )
- trackback_response(1, 'I really need an ID for this to work.');
-
- if (empty($title) && empty($tb_url) && empty($blog_name)) {
- // If it doesn't look like a trackback at all...
- wp_redirect(get_permalink($tb_id));
- exit;
- }
-
- if ( !empty($tb_url) && !empty($title) ) {
- header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
-
- if ( !pings_open($tb_id) )
- trackback_response(1, 'Sorry, trackbacks are closed for this item.');
-
- $title = wp_html_excerpt( $title, 250 ).'...';
- $excerpt = wp_html_excerpt( $excerpt, 252 ).'...';
-
- $comment_post_ID = (int) $tb_id;
- $comment_author = $blog_name;
- $comment_author_email = '';
- $comment_author_url = $tb_url;
- $comment_content = "<strong>$title</strong>\n\n$excerpt";
- $comment_type = 'trackback';
-
- $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) );
- if ( $dupe )
- trackback_response(1, 'We already have a ping from that URL for this post.');
-
- $commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type');
-
- wp_new_comment($commentdata);
-
- do_action('trackback_post', $wpdb->insert_id);
- trackback_response(0);
- }
- ?>