Add 204 endpoint

Fixes #6967

This allows clients to check for Walled Garden connections.
The endpoint just responds with a 204 (which is very unlikely with such
a connection)

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

core/Controller/WalledGardenController.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Core\Controller;
+
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Response;
+
+class WalledGardenController extends Controller {
+
+	/**
+	 * @PublicPage
+	 * @NoCSRFRequired
+	 *
+	 * @return Response
+	 */
+	function get() {
+		$resp = new Response();
+		$resp->setStatus(Http::STATUS_NO_CONTENT);
+		return $resp;
+	}
+}

core/routes.php

@@ -62,7 +62,8 @@ $application->registerRoutes($this, [
 		['name' => 'Js#getJs', 'url' => '/js/{appName}/{fileName}', 'verb' => 'GET'],
 		['name' => 'contactsMenu#index', 'url' => '/contactsmenu/contacts', 'verb' => 'POST'],
 		['name' => 'contactsMenu#findOne', 'url' => '/contactsmenu/findOne', 'verb' => 'POST'],
-		['name' => 'AutoComplete#get', 'url' => 'autocomplete/get', 'verb' => 'GET']
+		['name' => 'AutoComplete#get', 'url' => 'autocomplete/get', 'verb' => 'GET'],
+		['name' => 'WalledGarden#get', 'url' => '/204', 'verb' => 'GET'],
 	],
 	'ocs' => [
 		['root' => '/cloud', 'name' => 'OCS#getCapabilities', 'url' => '/capabilities', 'verb' => 'GET'],