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< ? php
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/**
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* Handle Trackbacks and Pingbacks Sent to WordPress
*
* @ since 0.71
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*
* @ package WordPress
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* @ subpackage Trackbacks
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*/
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if ( empty ( $wp )) {
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require_once ( dirname ( __FILE__ ) . '/wp-load.php' );
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wp ( array ( 'tb' => '1' ) );
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}
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/**
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* Response to a trackback .
*
* Responds with an error or success XML message .
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*
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* @ since 0.71
*
* @ param int | bool $error Whether there was an error .
* Default '0' . Accepts '0' or '1' .
* @ param string $error_message Error message if an error occurred .
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*/
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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> $error_message </message> \n " ;
echo " </response> " ;
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die ();
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} else {
echo '<?xml version="1.0" encoding="utf-8"?' . " > \n " ;
echo " <response> \n " ;
echo " <error>0</error> \n " ;
echo " </response> " ;
}
}
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// Trackback is done by a POST.
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$request_array = 'HTTP_POST_VARS' ;
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if ( ! isset ( $_GET [ 'tb_id' ]) || ! $_GET [ 'tb_id' ] ) {
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$tb_id = explode ( '/' , $_SERVER [ 'REQUEST_URI' ]);
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$tb_id = intval ( $tb_id [ count ( $tb_id ) - 1 ] );
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}
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$tb_url = isset ( $_POST [ 'url' ]) ? $_POST [ 'url' ] : '' ;
$charset = isset ( $_POST [ 'charset' ]) ? $_POST [ 'charset' ] : '' ;
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// These three are stripslashed here so they can be properly escaped after mb_convert_encoding().
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$title = isset ( $_POST [ 'title' ]) ? wp_unslash ( $_POST [ 'title' ]) : '' ;
$excerpt = isset ( $_POST [ 'excerpt' ]) ? wp_unslash ( $_POST [ 'excerpt' ]) : '' ;
$blog_name = isset ( $_POST [ 'blog_name' ]) ? wp_unslash ( $_POST [ 'blog_name' ]) : '' ;
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if ( $charset )
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$charset = str_replace ( array ( ',' , ' ' ), '' , strtoupper ( trim ( $charset ) ) );
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else
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$charset = 'ASCII, UTF-8, ISO-8859-1, JIS, EUC-JP, SJIS' ;
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// No valid uses for UTF-7.
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if ( false !== strpos ( $charset , 'UTF-7' ) )
die ;
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// For international trackbacks.
if ( function_exists ( 'mb_convert_encoding' ) ) {
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$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' ), $charset );
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}
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// Now that mb_convert_encoding() has been given a swing, we need to escape these three.
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$title = wp_slash ( $title );
$excerpt = wp_slash ( $excerpt );
$blog_name = wp_slash ( $blog_name );
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if ( is_single () || is_page () )
$tb_id = $posts [ 0 ] -> ID ;
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if ( ! isset ( $tb_id ) || ! intval ( $tb_id ) )
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trackback_response ( 1 , 'I really need an ID for this to work.' );
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if ( empty ( $title ) && empty ( $tb_url ) && empty ( $blog_name )) {
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// If it doesn't look like a trackback at all.
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wp_redirect ( get_permalink ( $tb_id ));
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exit ;
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}
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if ( ! empty ( $tb_url ) && ! empty ( $title ) ) {
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header ( 'Content-Type: text/xml; charset=' . get_option ( 'blog_charset' ) );
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if ( ! pings_open ( $tb_id ) )
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trackback_response ( 1 , 'Sorry, trackbacks are closed for this item.' );
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$title = wp_html_excerpt ( $title , 250 , '…' );
$excerpt = wp_html_excerpt ( $excerpt , 252 , '…' );
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$comment_post_ID = ( int ) $tb_id ;
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$comment_author = $blog_name ;
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$comment_author_email = '' ;
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$comment_author_url = $tb_url ;
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$comment_content = " <strong> $title </strong> \n \n $excerpt " ;
$comment_type = 'trackback' ;
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$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 ) );
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if ( $dupe )
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trackback_response ( 1 , 'We already have a ping from that URL for this post.' );
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$commentdata = compact ( 'comment_post_ID' , 'comment_author' , 'comment_author_email' , 'comment_author_url' , 'comment_content' , 'comment_type' );
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wp_new_comment ( $commentdata );
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$trackback_id = $wpdb -> insert_id ;
/**
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* Fires after a trackback is added to a post .
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*
* @ since 1.2 . 0
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*
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* @ param int $trackback_id Trackback ID .
*/
do_action ( 'trackback_post' , $trackback_id );
trackback_response ( 0 );
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}