Fix HTTP OPTIONS requests

lib/Controller/Controller.php

@@ -111,6 +111,16 @@ public function run($op, $uuid) {
 		// call the operation
 		return $this->{$op}($uuid);
 	}
+
+	/**
+	 * Return header for an OPTIONS request
+	 */
+	public function options(): array {
+		return [
+			'Access-Control-Allow-Origin' => '*',
+			'Access-Control-Allow-Methods' => 'DELETE, GET, HEAD, OPTIONS, PATCH, POST, PULL',
+		];
+	}
 }
 
 ?>

lib/Router.php

@@ -63,6 +63,8 @@ class Router implements HttpKernelInterface {
 		'POST'			=> 'add',
 		'DELETE'		=> 'delete',
 		'GET'			=> 'get',
+		'HEAD'			=> 'get',
+		'OPTIONS'		=> 'options',
 		'PATCH'			=> 'edit',
 		'PULL'			=> 'edit'		// not REST-conform
 	);
@@ -200,6 +202,9 @@ function handler(Request $request, $context, $uuid) {
 		if (null === ($operation = $request->query->get('operation'))) {
 			$operation = self::$operationMapping[$request->getMethod()];
 		}
+		if ($operation === 'options') {
+			$this->view = new View\Options($request);
+		}
 
 		$class = self::$controllerMapping[$context];
 		$controller = new $class($request, $this->em, $this->view);

lib/View/Options.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * @copyright Copyright (c) 2025, The volkszaehler.org project
+ * @license https://www.gnu.org/licenses/gpl-3.0.txt GNU General Public License version 3
+ */
+/*
+ * This file is part of volkzaehler.org
+ *
+ * volkzaehler.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * volkzaehler.org 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with volkszaehler.org. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Volkszaehler\View;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * HTTP OPTIONS request response view
+ */
+class Options extends View {
+
+	public function __construct(Request $request) {
+		parent::__construct($request);
+		$this->response = new Response(
+			null,
+			Response::HTTP_NO_CONTENT
+		);
+	}
+
+	protected function render() {
+		throw new \LogicException('Not needed here');
+	}
+
+	/**
+	 * Render response and send it to the client
+	 */
+	public function send(): Response {
+		return $this->response;
+	}
+
+	/**
+	 * Add headers to response
+	 */
+	public function add($headers) {
+		foreach ($headers as $key => $value) {
+			$this->response->headers->set($key, $value);
+		}
+	}
+}