150 lines
4.6 KiB
PHP
150 lines
4.6 KiB
PHP
<?php
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/**
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* Handle Trackbacks and Pingbacks Sent to WordPress
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*
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* @since 0.71
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*
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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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// Always run as an unauthenticated user.
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wp_set_current_user( 0 );
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/**
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* Response to a trackback.
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*
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* Responds with an error or success XML message.
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*
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* @since 0.71
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*
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* @param mixed $error Whether there was an error.
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* Default '0'. Accepts '0' or '1', true or false.
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* @param string $error_message Error message if an error occurred.
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*/
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function trackback_response($error = 0, $error_message = '') {
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header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
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if ($error) {
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echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
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echo "<response>\n";
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echo "<error>1</error>\n";
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echo "<message>$error_message</message>\n";
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echo "</response>";
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die();
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} else {
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echo '<?xml version="1.0" encoding="utf-8"?'.">\n";
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echo "<response>\n";
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echo "<error>0</error>\n";
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echo "</response>";
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}
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}
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// Trackback is done by a POST.
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$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']) ? $_POST['url'] : '';
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$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']) : '';
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$excerpt = isset($_POST['excerpt']) ? wp_unslash($_POST['excerpt']) : '';
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$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($charset, 'UTF-7') )
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die;
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// For international trackbacks.
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if ( function_exists('mb_convert_encoding') ) {
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$title = mb_convert_encoding($title, get_option('blog_charset'), $charset);
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$excerpt = mb_convert_encoding($excerpt, get_option('blog_charset'), $charset);
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$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($title);
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$excerpt = wp_slash($excerpt);
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$blog_name = wp_slash($blog_name);
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if ( is_single() || is_page() )
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$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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/**
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* Fires before the trackback is added to a post.
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*
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* @since 4.7.0
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*
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* @param int $tb_id Post ID related to the trackback.
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* @param string $tb_url Trackback URL.
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* @param string $charset Character Set.
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* @param string $title Trackback Title.
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* @param string $excerpt Trackback Excerpt.
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* @param string $blog_name Blog Name.
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*/
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do_action( 'pre_trackback_post', $tb_id, $tb_url, $charset, $title, $excerpt, $blog_name );
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header('Content-Type: text/xml; charset=' . get_option('blog_charset') );
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if ( !pings_open($tb_id) )
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trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) );
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$title = wp_html_excerpt( $title, 250, '…' );
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$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";
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$comment_type = 'trackback';
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$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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$result = wp_new_comment( $commentdata );
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if ( is_wp_error( $result ) ) {
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trackback_response( 1, $result->get_error_message() );
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}
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$trackback_id = $wpdb->insert_id;
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/**
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* Fires after a trackback is added to a post.
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*
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* @since 1.2.0
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*
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* @param int $trackback_id Trackback ID.
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*/
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do_action( 'trackback_post', $trackback_id );
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trackback_response( 0 );
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}
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