Allow to enable/disable MCP endpoint

src/EventSubscriber/McpAccessSubscriber.php

@@ -0,0 +1,60 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2026 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  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 <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace App\EventSubscriber;
+
+use App\Settings\AISettings\McpSettings;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+readonly class McpAccessSubscriber implements EventSubscriberInterface
+{
+    public function __construct(private McpSettings $mcpSettings)
+    {
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            KernelEvents::REQUEST => ['onKernelRequest', 10],
+        ];
+    }
+
+    public function onKernelRequest(RequestEvent $event): void
+    {
+        if (!$event->isMainRequest()) {
+            return;
+        }
+
+        $path = $event->getRequest()->getPathInfo();
+
+        if (!str_starts_with($path, '/mcp')) {
+            return;
+        }
+
+        if (!$this->mcpSettings->enabled) {
+            throw new ServiceUnavailableHttpException(null, 'The MCP endpoint is disabled. Enable it in the system settings.');
+        }
+    }
+}