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 ( !$_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  = $_POST['url'];

    45 $charset = $_POST['charset'];

    46 

    47 // These three are stripslashed here so that they can be properly escaped after mb_convert_encoding()

    48 $title     = stripslashes($_POST['title']);

    49 $excerpt   = stripslashes($_POST['excerpt']);

    50 $blog_name = stripslashes($_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 ( !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 ?>