<?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' ) );

}

/**

 * 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.

 */

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'] ) {

}

// 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.

	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 );

}

$title     = wp_slash( $title );

$excerpt   = wp_slash( $excerpt );

$blog_name = wp_slash( $blog_name );

if ( is_single() || is_page() ) {

}

	trackback_response( 1, __( 'I really need an ID for this to work.' ) );

}

	// If it doesn't look like a trackback at all.

	exit;

}

	/**

	 * Fires before the trackback is added to a post.

	 *

	 * @since 4.7.0

	 *

	 */

	header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );

		trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) );

	}

	$title   = wp_html_excerpt( $title, 250, '…' );

	$excerpt = wp_html_excerpt( $excerpt, 252, '…' );

	$comment_author       = $blog_name;

	$comment_author_email = '';

	$comment_content      = "<strong>$title</strong>\n\n$excerpt";

	$comment_type         = 'trackback';

	if ( $dupe ) {

		trackback_response( 1, __( 'There is already a ping from that URL for this post.' ) );

	}

	$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 );

}