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This was present in the initial import of b2 files, but appears to have never been used in WordPress core. Follow-up to [3], [636], [637], [1616]. See #55647. Built from https://develop.svn.wordpress.org/trunk@53720 git-svn-id: http://core.svn.wordpress.org/trunk@53279 1a063a9b-81f0-0310-95a4-ce76da25c4cd
169 lines
4.7 KiB
PHP
169 lines
4.7 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 __DIR__ . '/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.
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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 int|bool $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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if ( ! isset( $_GET['tb_id'] ) || ! $_GET['tb_id'] ) {
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$post_id = explode( '/', $_SERVER['REQUEST_URI'] );
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$post_id = (int) $post_id[ count( $post_id ) - 1 ];
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}
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$trackback_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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}
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// No valid uses for UTF-7.
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if ( false !== strpos( $charset, 'UTF-7' ) ) {
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die;
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}
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// For international trackbacks.
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if ( function_exists( 'mb_convert_encoding' ) ) {
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$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( $blog_name );
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if ( is_single() || is_page() ) {
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$post_id = $posts[0]->ID;
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}
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if ( ! isset( $post_id ) || ! (int) $post_id ) {
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trackback_response( 1, __( 'I really need an ID for this to work.' ) );
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}
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if ( empty( $title ) && empty( $trackback_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( $post_id ) );
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exit;
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}
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if ( ! empty( $trackback_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 $post_id Post ID related to the trackback.
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* @param string $trackback_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', $post_id, $trackback_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( $post_id ) ) {
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trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) );
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}
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$title = wp_html_excerpt( $title, 250, '…' );
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$excerpt = wp_html_excerpt( $excerpt, 252, '…' );
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$comment_post_id = (int) $post_id;
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$comment_author = $blog_name;
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$comment_author_email = '';
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$comment_author_url = $trackback_url;
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$comment_content = "<strong>$title</strong>\n\n$excerpt";
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$comment_type = 'trackback';
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$dupe = $wpdb->get_results(
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$wpdb->prepare(
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"SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_author_url = %s",
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$comment_post_id,
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$comment_author_url
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)
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);
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if ( $dupe ) {
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trackback_response( 1, __( 'There is already a ping from that URL for this post.' ) );
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}
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$commentdata = array(
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'comment_post_ID' => $comment_post_id,
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);
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$commentdata += compact(
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'comment_author',
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'comment_author_email',
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'comment_author_url',
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'comment_content',
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'comment_type'
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);
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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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