mu-plugins/extending-xmlrpc.php

extending-xmlrpc.php

<?php
/**
 * Plugin Name: jQuery extends WordPress XML-RPC
 * Description: Enables XML-RPC and adds custom methods.
 */

add_action( 'enable_xmlrpc', '__return_true' );

function jquery_get_post_paths( $args ) {
    $post_type = sanitize_key( $args[0] );

	$results = array();
	$query = new WP_Query( array(
		'post_type' => $post_type,
		'post_status' => 'publish',
		'posts_per_page' => -1,
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false,
	) );
	foreach ( $query->posts as $post )
		$results[ $post->post_type . '/' . get_page_uri( $post->ID ) ] = $post->ID;

	return $results;
}

function jquery_register_xmlrpc_methods( $methods ) {
    $methods['jquery.get_post_paths'] = 'jquery_get_post_paths';
    return $methods;
}
add_filter( 'xmlrpc_methods', 'jquery_register_xmlrpc_methods' );