Added possibility to add a change comment to changes via the API

docs/api/intro.md

@@ -89,3 +89,10 @@ For example if you only want to get the name and the description of a part, you
 It is also possible to use this filters on list endpoints (get collection), to only get a subset of the properties of all entities in the collection.
 
 See [API Platform docs](https://api-platform.com/docs/core/filters/#property-filter) for more infos.
+
+## Change comment
+
+Similar to the changes using Part-DB web interface, you can add a change comment to every change you make via the API, which will be 
+visible in the log of the entity.
+
+You can pass the text for this via the `_comment` query parameter (beware the proper encoding). For example `/api/parts/123?_comment=This%20is%20a%20change%20comment`.

src/EventListener/AddEditCommentRequestListener.php

@@ -0,0 +1,62 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 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\EventListener;
+
+use App\Services\LogSystem\EventCommentHelper;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+
+#[AsEventListener()]
+class AddEditCommentRequestListener
+{
+    public function __construct(private readonly EventCommentHelper $helper)
+    {
+
+    }
+
+    public function __invoke(RequestEvent $event)
+    {
+        if (!$event->isMainRequest()) {
+            return;
+        }
+        $request = $event->getRequest();
+
+        //Do not add comment if the request is a GET request
+        if ($request->isMethod('GET')) {
+            return;
+        }
+
+        //Check if the user tries to access a /api/ endpoint, if not skip
+        if (!str_contains($request->getPathInfo(), '/api/')) {
+            return;
+        }
+
+        //Extract the comment from the query parameter
+        $comment = $request->query->getString('_comment', '');
+
+        if ($comment !== '') {
+            $this->helper->setMessage($comment);
+        }
+    }
+}