server/apps/files_external/appinfo/application.php

<?php
/**
 * Copyright (c) 2015 University of Edinburgh <Ross.Nicoll@ed.ac.uk>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

namespace OCA\Files_External\Appinfo;

use \OCA\Files_External\Controller\AjaxController;
use \OCP\AppFramework\App;
use \OCP\IContainer;

 /**
  * @package OCA\Files_External\Appinfo
  */
class Application extends App {
	public function __construct(array $urlParams=array()) {
		parent::__construct('files_external', $urlParams);
		$container = $this->getContainer();

		/**
		 * Controllers
		 */
		$container->registerService('AjaxController', function (IContainer $c) {
			return new AjaxController(
				$c->query('AppName'),
				$c->query('Request')
			);
		});
	}
}