<?php
/**
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Stefan Weil <sw@weilnetz.de>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

/**
 * Public interface of ownCloud for apps to use.
 * AppFramework\Controller class
 */

namespace OCP\AppFramework;

use OCP\AppFramework\Http\Response;
use OCP\IRequest;

/**
 * Base class to inherit your controllers from that are used for RESTful APIs
 * @since 7.0.0
 */
abstract class ApiController extends Controller {
	private $corsMethods;
	private $corsAllowedHeaders;
	private $corsMaxAge;

	/**
	 * constructor of the controller
	 * @param string $appName the name of the app
	 * @param IRequest $request an instance of the request
	 * @param string $corsMethods comma separated string of HTTP verbs which
	 * should be allowed for websites or webapps when calling your API, defaults to
	 * 'PUT, POST, GET, DELETE, PATCH'
	 * @param string $corsAllowedHeaders comma separated string of HTTP headers
	 * which should be allowed for websites or webapps when calling your API,
	 * defaults to 'Authorization, Content-Type, Accept'
	 * @param int $corsMaxAge number in seconds how long a preflighted OPTIONS
	 * request should be cached, defaults to 1728000 seconds
	 * @since 7.0.0
	 */
	public function __construct(
		$appName,
		IRequest $request,
		$corsMethods='PUT, POST, GET, DELETE, PATCH',
		$corsAllowedHeaders='Authorization, Content-Type, Accept',
		$corsMaxAge=1728000
	) {
		parent::__construct($appName, $request);
		$this->corsMethods = $corsMethods;
		$this->corsAllowedHeaders = $corsAllowedHeaders;
		$this->corsMaxAge = $corsMaxAge;
	}

	/**
	 * This method implements a preflighted cors response for you that you can
	 * link to for the options request
	 *
	 * @NoAdminRequired
	 * @NoCSRFRequired
	 * @PublicPage
	 * @since 7.0.0
	 */
	public function preflightedCors() {
		if (isset($this->request->server['HTTP_ORIGIN'])) {
			$origin = $this->request->server['HTTP_ORIGIN'];
		} else {
			$origin = '*';
		}

		$response = new Response();
		$response->addHeader('Access-Control-Allow-Origin', $origin);
		$response->addHeader('Access-Control-Allow-Methods', $this->corsMethods);
		$response->addHeader('Access-Control-Max-Age', $this->corsMaxAge);
		$response->addHeader('Access-Control-Allow-Headers', $this->corsAllowedHeaders);
		$response->addHeader('Access-Control-Allow-Credentials', 'false');
		return $response;
	}
}
