From a564828c8846fc285ea34004e6a8f047a8848804 Mon Sep 17 00:00:00 2001
From: Joas Schilling <coding@schilljs.com>
Date: Wed, 14 Apr 2021 16:28:26 +0200
Subject: [PATCH] Delete groups from settings when they are deleted

Signed-off-by: Joas Schilling <coding@schilljs.com>
---
 lib/AppInfo/Application.php           |  3 ++
 lib/Listener/GroupDeletedListener.php | 65 +++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 lib/Listener/GroupDeletedListener.php

diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index a02cde54ca..f35b8b6f3c 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -45,6 +45,7 @@ use OCA\Talk\Flow\Operation;
 use OCA\Talk\Listener\BeforeUserLoggedOutListener;
 use OCA\Talk\Listener\CSPListener;
 use OCA\Talk\Listener\FeaturePolicyListener;
+use OCA\Talk\Listener\GroupDeletedListener;
 use OCA\Talk\Listener\GroupMembershipListener;
 use OCA\Talk\Listener\RestrictStartingCalls as RestrictStartingCallsListener;
 use OCA\Talk\Listener\UserDeletedListener;
@@ -72,6 +73,7 @@ use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Collaboration\Resources\IProviderManager;
 use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Group\Events\GroupDeletedEvent;
 use OCP\Group\Events\UserAddedEvent;
 use OCP\Group\Events\UserRemovedEvent;
 use OCP\IServerContainer;
@@ -97,6 +99,7 @@ class Application extends App implements IBootstrap {
 
 		$context->registerEventListener(AddContentSecurityPolicyEvent::class, CSPListener::class);
 		$context->registerEventListener(AddFeaturePolicyEvent::class, FeaturePolicyListener::class);
+		$context->registerEventListener(GroupDeletedEvent::class, GroupDeletedListener::class);
 		$context->registerEventListener(UserDeletedEvent::class, UserDeletedListener::class);
 		$context->registerEventListener(UserAddedEvent::class, GroupMembershipListener::class);
 		$context->registerEventListener(UserRemovedEvent::class, GroupMembershipListener::class);
diff --git a/lib/Listener/GroupDeletedListener.php b/lib/Listener/GroupDeletedListener.php
new file mode 100644
index 0000000000..d4112dddda
--- /dev/null
+++ b/lib/Listener/GroupDeletedListener.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Joas Schilling <coding@schilljs.com>
+ *
+ * @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 OCA\Talk\Listener;
+
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Group\Events\GroupDeletedEvent;
+use OCP\IConfig;
+
+class GroupDeletedListener implements IEventListener {
+
+	/** @var IConfig */
+	private $config;
+
+	public function __construct(IConfig $config) {
+		$this->config = $config;
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof GroupDeletedEvent)) {
+			// Unrelated
+			return;
+		}
+
+		$gid = $event->getGroup()->getGID();
+
+		$this->removeGroupFromConfig('sip_bridge_groups', $gid);
+		$this->removeGroupFromConfig('start_conversations', $gid);
+		$this->removeGroupFromConfig('allowed_groups', $gid);
+	}
+
+	protected function removeGroupFromConfig(string $configKey, string $removeGroupId): void {
+
+		$json = $this->config->getAppValue('spreed', $configKey, '[]');
+		$array = json_decode($json, true);
+		$gids = \is_array($array) ? $array : [];
+
+		$gids = array_filter($gids, static function($gid) use ($removeGroupId) {
+			return $gid !== $removeGroupId;
+		});
+
+		$this->config->setAppValue('spreed', $configKey, json_encode($gids));
+	}
+}