diff options
Diffstat (limited to 'wp-trackback.php')
| -rw-r--r-- | wp-trackback.php | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/wp-trackback.php b/wp-trackback.php new file mode 100644 index 0000000..670d9c4 --- /dev/null +++ b/wp-trackback.php @@ -0,0 +1,171 @@ +<?php +/** + * Handle Trackbacks and Pingbacks Sent to WordPress + * + * @since 0.71 + * + * @package WordPress + * @subpackage Trackbacks + */ + +if ( empty( $wp ) ) { + require_once __DIR__ . '/wp-load.php'; + wp( array( 'tb' => '1' ) ); +} + +// Always run as an unauthenticated user. +wp_set_current_user( 0 ); + +/** + * Response to a trackback. + * + * Responds with an error or success XML message. + * + * @since 0.71 + * + * @param int|bool $error Whether there was an error. + * Default '0'. Accepts '0' or '1', true or false. + * @param string $error_message Error message if an error occurred. Default empty string. + */ +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>'; + } +} + +if ( ! isset( $_GET['tb_id'] ) || ! $_GET['tb_id'] ) { + $post_id = explode( '/', $_SERVER['REQUEST_URI'] ); + $post_id = (int) $post_id[ count( $post_id ) - 1 ]; +} + +$trackback_url = isset( $_POST['url'] ) ? $_POST['url'] : ''; +$charset = isset( $_POST['charset'] ) ? $_POST['charset'] : ''; + +// These three are stripslashed here so they can be properly escaped after mb_convert_encoding(). +$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'] ) : ''; + +if ( $charset ) { + $charset = str_replace( array( ',', ' ' ), '', strtoupper( trim( $charset ) ) ); +} else { + $charset = 'ASCII, UTF-8, ISO-8859-1, JIS, EUC-JP, SJIS'; +} + +// No valid uses for UTF-7. +if ( str_contains( $charset, 'UTF-7' ) ) { + die; +} + +// For international trackbacks. +if ( function_exists( 'mb_convert_encoding' ) ) { + $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' ), $charset ); +} + +// Escape values to use in the trackback. +$title = wp_slash( $title ); +$excerpt = wp_slash( $excerpt ); +$blog_name = wp_slash( $blog_name ); + +if ( is_single() || is_page() ) { + $post_id = $posts[0]->ID; +} + +if ( ! isset( $post_id ) || ! (int) $post_id ) { + trackback_response( 1, __( 'I really need an ID for this to work.' ) ); +} + +if ( empty( $title ) && empty( $trackback_url ) && empty( $blog_name ) ) { + // If it doesn't look like a trackback at all. + wp_redirect( get_permalink( $post_id ) ); + exit; +} + +if ( ! empty( $trackback_url ) && ! empty( $title ) ) { + /** + * Fires before the trackback is added to a post. + * + * @since 4.7.0 + * + * @param int $post_id Post ID related to the trackback. + * @param string $trackback_url Trackback URL. + * @param string $charset Character set. + * @param string $title Trackback title. + * @param string $excerpt Trackback excerpt. + * @param string $blog_name Site name. + */ + do_action( 'pre_trackback_post', $post_id, $trackback_url, $charset, $title, $excerpt, $blog_name ); + + header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) ); + + if ( ! pings_open( $post_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) $post_id; + $comment_author = $blog_name; + $comment_author_email = ''; + $comment_author_url = $trackback_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, __( 'There is already a ping from that URL for this post.' ) ); + } + + $commentdata = array( + 'comment_post_ID' => $comment_post_id, + ); + + $commentdata += compact( + 'comment_author', + 'comment_author_email', + 'comment_author_url', + 'comment_content', + 'comment_type' + ); + + $result = wp_new_comment( $commentdata ); + + if ( is_wp_error( $result ) ) { + trackback_response( 1, $result->get_error_message() ); + } + + $trackback_id = $wpdb->insert_id; + + /** + * Fires after a trackback is added to a post. + * + * @since 1.2.0 + * + * @param int $trackback_id Trackback ID. + */ + do_action( 'trackback_post', $trackback_id ); + + trackback_response( 0 ); +} |