EDD Software Licensing Optimized Endpoint

class-edd-sl-api-endpoint.php

<?php
/**
 * Plugin Name: EDD Software Licensing Endpoint
 * Plugin URI: https://github.com/Frosty-Media/edd-sl-api-endpoint
 * Description: Endpoint for Easy Digital Downloads Software Licensing add-on.
 * Version: 1.0.1
 * License: GPL version 2 or any later version
 * Author: Danny van Kooten
 * Author URI: https://github.com/dannyvankooten/
 */

if ( stristr( $_SERVER['REQUEST_URI'], '/edd-sl-api' ) !== false ) {

	/**
	 * Class EDD_SL_API_Endpoint
	 *
	 * Creates an endpoint for EDD Software Licensing requests
	 * Halves the memory consumption and runtime of all remote requests
	 */
	class EDD_SL_API_Endpoint {

		public function __construct() {

			// set constant to use later on
			define( 'EDD_SL_DOING_API', true );

			// disable cronjobs for this request
			define( 'DISABLE_WP_CRON', true );

			// prevent session query caused by EDD
			define( 'EDD_USE_PHP_SESSIONS', true );

			// filter active plugins
			add_filter( 'option_active_plugins', array( $this, 'filter_active_plugins' ) );

			// disable loading of any widgets
			add_filter( 'after_setup_theme', array( $this, 'disable_widgets' ) );

			// throw error if a result hasn't been returned on init:99
			add_action( 'init', array( $this, 'throw_api_error' ), 99 );
		}

		/**
		 * Disable all widgets
		 */
		public function disable_widgets() {
			remove_all_actions( 'widgets_init' );
		}

		/**
		 * For all requests to the EDD SL API, we only need to load Easy Digital Downloads + Software Licensing
		 *
		 * @param $active_plugins
		 *
		 * @return array
		 */
		public function filter_active_plugins( $active_plugins ) {
			$active_plugins = array(
				'code-snippets-pro/code-snippets.php', // Custom code that might interact.
				'easy-digital-downloads/easy-digital-downloads.php',
				'edd-software-licensing/edd-software-licenses.php',
				'edd-all-access/edd-all-access.php',
				'edd-slack/edd-slack.php',
				'edd-recurring/edd-recurring.php', // EDD Recurring Payments,
				'wp-fusion/wp-fusion.php', // Syncing to CRM.
				'edd-sl-variable-price-limits/edd-sl-variable-price-limits.php',
			);

			return $active_plugins;
		}

		/**
		 * By now, the EDD SL API should have sent a response and died.
		 *
		 * If the request reaches this hook callback, die.
		 */
		public function throw_api_error() {

			$this->send_header( '400 Bad Request' );

			$this->send_response(
				array(
					'status' => 'error',
					'message' => 'Something went wrong.'
				)
			);
		}


		/**
		 * @param string $header
		 *
		 * Send a header
		 */
		private function send_header( $header ) {
			header( $_SERVER['SERVER_PROTOCOL'] . ' ' . $header );
		}

		/**
		 * Send a JSON response
		 *
		 * @param array $response
		 */
		private function send_response( $response ) {
			// set correct Content Type header
			header( 'Content-Type: application/json' );
			echo json_encode( $response );
			die();
		}
	}

	new EDD_SL_API_Endpoint;

	/**
	 * Override get_currentuserinfo to prevent a user query
	 *
	 * @return bool
	 */
	function get_currentuserinfo() {
		wp_set_current_user( 0 );
		return false;
	}

}