class-dcdc-docs-endpoint.php

<?php
/*
Plugin Name: DCDC Docs Endpoint
Description: Exposes the docs/v1 namespace and search endpoint for use by other VPA sites in the network
Version: 0.1
Author: Joel Stransky
Author URI: https://dcdc.coe.hawaii.edu/
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'DCDC_Docs_Endpoint' ) ) {
	class DCDC_Docs_Endpoint {
		public static function init() {
			self::includes();
			self::hooks();
		}

		private static function includes() {
			if ( class_exists( 'WP_REST_Controller' ) ) {
				require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-dcdc-docs-endpoint-controller.php';
			}
		}

		private static function hooks() {
			/**
			* Add REST API support to an already registered post type.
			*/
			add_action( 'init', array( __CLASS__, 'set_documents_rest_controller'), 25 );
			if ( class_exists( 'WP_REST_Controller' ) ) {
				add_action( 'rest_api_init', array( __CLASS__, 'create_rest_routes'), 10 );
			} else {
				add_action( 'admin_notices', array( __CLASS__, 'missing_notice' ) );
			}
			// inspect acf-to-rest-api
			add_filter( 'acf/rest_api/type', function( $type ) {
				// write_log(array('acf rest type', $type));
				return $type;
			} );

			if (class_exists( 'acf' ) && class_exists( 'ACF_To_REST_API' ) ) {
				add_filter( 'acf/rest_api/document_cpt/get_fields', function($data, $request, $response, $object) {
					// write_log( array('acf rest get fields', $data, $request, $response, $object ) );
					// include list of document_type terms
					$terms = get_the_terms( $object->ID, 'document_type');
					foreach ($terms as $term) {
						$data->data['acf']['document_type_terms'][] = $term;
					}

					// include list of document_tags terms
					$terms = get_the_terms( $object->ID, 'document_tags');
					foreach ($terms as $term) {
						$data->data['acf']['document_tags_terms'][] = $term;
					}


					return $data;
				}, 10, 4);
			}
		}

		public static function set_documents_rest_controller() {
			global $wp_post_types;
			$post_type_name = 'document_cpt';
			if( isset( $wp_post_types[ $post_type_name ] ) ) {
				$wp_post_types[$post_type_name]->show_in_rest = true;
				$wp_post_types[$post_type_name]->rest_base = $post_type_name;
				$wp_post_types[$post_type_name]->rest_controller_class = 'WP_REST_DCDC_Docs_Endpoint_Controller';
			}

		}

		public static function create_rest_routes() {
			$types = get_post_types( array( 'show_in_rest' => true ), 'objects' );
			if( isset( $types['document_cpt'] ) ) {
				$controller = new WP_REST_DCDC_Docs_Endpoint_Controller( 'document_cpt' );
				$controller->register_routes();
			}
		}

		public static function missing_notice() {
			?>
			<div class="notice error is-dismissible">
				<p><strong>DCDC Docs Endpoint</strong> Requires WordPress REST API, ACF and ACF to REST API plugins.</p>
			</div>
			<?php
		}
	}

	add_action( 'plugins_loaded', array( 'DCDC_Docs_Endpoint', 'init' ) );
}

class-wp-rest-dcdc-docs-endpoint-controller.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
if ( ! class_exists( 'WP_REST_DCDC_Docs_Endpoint_Controller' ) ) {
	class WP_REST_DCDC_Docs_Endpoint_Controller extends WP_REST_Posts_Controller {

		public function __construct() {
			$this->post_type = 'document_cpt';
			$this->namespace = 'docs/v1';
			$this->rest_base = 's';
		}

		public function register_routes() {
			register_rest_route( $this->namespace, '/' . $this->rest_base, array(
				array(
					'methods'         => WP_REST_Server::READABLE,
					'callback'        => array( $this, 'get_items' ),
					// 'permission_callback' => array( $this, 'get_items_permissions_check' ),
					// 'args'            => $this->get_collection_params(),
				),
				// 'schema'          => array( $this, 'get_public_item_schema' ),
			) );
		}

		public function get_items( $request ) {
			write_log(array('get items', $request['search']));
			$args = array(
			  'is_doc_query'  => true,
			  's'           => isset( $request['search'] ) ? $request['search'] : "",
			  'post_type'   => array( 'document_cpt' )
			);
			// add doctype filters as a property of the WP_Query object
			if ( isset( $request['filter']['doctypes'] ) && $request['filter']['doctypes'] != "" ) {
			  $args['doctypes'] = explode(",", $request['filter']['doctypes'] );
			}
			$doc_query = new WP_Query();
			$query_result = $doc_query->query( $args );
			$posts = array();
			foreach ( $query_result as $post ) {
				// if ( ! $this->check_read_permission( $post ) ) {
				// 	continue;
				// }

				$data = $this->prepare_item_for_response( $post, $request );
				$posts[] = $this->prepare_response_for_collection( $data );
			}

			return new WP_REST_Response( $posts, 200 );
		}
	}
}