add filtertopic

src/EventHandler/Filter/FilterTopicId.php

@@ -0,0 +1,39 @@
+<?php declare(strict_types=1);
+
+/**
+ * This file is part of MadelineProto.
+ * MadelineProto 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.
+ * MadelineProto 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 General Public License along with MadelineProto.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    Amir Hossein Jafari <amirhosseinjafari8228@gmail.com>
+ * @copyright 2016-2023 Amir Hossein Jafari <amirhosseinjafari8228@gmail.com>
+ * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
+ * @link https://docs.madelineproto.xyz MadelineProto documentation
+ */
+
+namespace danog\MadelineProto\EventHandler\Filter;
+
+use Attribute;
+use Webmozart\Assert\Assert;
+use danog\MadelineProto\EventHandler\Message;
+use danog\MadelineProto\EventHandler\Update;
+
+/**
+ * Allow only messages with a specific topic id (Supergroups only).
+ */
+#[Attribute(Attribute::TARGET_METHOD)]
+final class FilterTopicId extends Filter
+{
+    public function __construct(
+        private readonly int $topicId
+    ) {
+        Assert::greaterThan($topicId, 0);
+    }
+    public function apply(Update $update): bool
+    {
+        return ($update instanceof Message && $update->topicId === $this->topicId);
+    }
+}