<?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 ) ) );
// Validate the specified "sender" charset is available on the receiving site.
if ( function_exists( 'mb_list_encodings' ) && ! in_array( $charset, mb_list_encodings(), true ) ) {
$charset = '';
}
}
if ( ! $charset ) {
$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 );
}
في جولة حصرية داخل “الغرفة الزرقاء” بقناة BBC العربية، نكشف كواليس واحدة من أكثر غرف الأخبار تطورًا في العالم.
كيف الذكاء اصطناعي يتحكم بالبث دون تدخل بشري، لتقدم تجربة بصرية مذهلة.
الفيديو يستعرض كيف تمزج BBC بين التقنية والاحتراف لتصنع نشرات إخبارية من قلب المستقبل.
