The REST API is an awesome plugin to expose your data from the WordPress core. But … the standard implementation might not fit your specific case.
Just like the WordPress core, you'll be able to extend it to your specific needs. I'll show you how to handle authentication, introduce caching strategies, alter custom post types, or even change the default way of communication altogether.
14. YOU KNOW HOW TO CREATE A PLUGIN?
EXTENDING THE API
15. MY PLUGIN.PHP SETUP
<?php
/*
Plugin Name: My REST API extension
Plugin URI: https://www.a-wp-site.com/
Description: WordPress REST API extension
Version: 1.0.0
Author: Enrise
Author URI: https://www.enrise.com
*/
require_once('src/Bootstrap.php');
new Bootstrap::getInstance();
16. WHEN TO TRIGGER YOUR CODE
public static function getInstance() {
if ( ! ( self::$instance instanceof self ) ) {
self::$instance = new self();
}
return self::$instance;
}
protected function __construct() {
add_action( 'plugins_loaded', [ $this, 'initServer' ], 100 );
}
public function initServer() {
}
24. ACCESS POST TYPE & TAXONOMY
public function initServer() {
add_action( 'rest_api_init', [ $this, 'updateExposure' ], 12 );
}
public function updateExposure() {
global $wp_post_types, $wp_taxonomies;
$wp_post_types['customposttype']->show_in_rest = true;
$wp_taxonomies['customtaxonomy']->show_in_rest = true;
}
52. add_filter( 'rest_pre_serve_request', [ $this, 'changeResponse' ], 10, 4 );
public function changeResponse( $served, $response, $request, $server ) {
$route = $response->get_matched_route();
if ( $served || $route !== '/wp/v2/customposttype' ) {
return false;
}
if ( 'HEAD' === $request->get_method() ) {
return null;
}
$result = $server->response_to_data( $response, true );
$transform = new Transformer( $result );
echo wp_json_encode( iterator_to_array( $transform ) );
return true;
}
THIS SHOULDN’T BE NECESSARY…
53. class Transformer extends ArrayIterator {
public function current() {
$item = parent::current();
$item = $this->modify( $item );
return $item;
}
private function modify( array $data ) {
// modify the data in any way
return $data;
}
}
THIS SHOULDN’T BE NECESSARY…