Delete CalDav and CardDav shares upon group deletion

apps/dav/lib/AppInfo/Application.php

@@ -89,6 +89,7 @@
 use OCP\DB\Events\AddMissingIndicesEvent;
 use OCP\Federation\Events\TrustedServerRemovedEvent;
 use OCP\Federation\ICloudFederationProviderManager;
+use OCP\Group\Events\GroupDeletedEvent;
 use OCP\IURLGenerator;
 use OCP\IUserSession;
 use OCP\Server;
@@ -205,6 +206,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(UserCreatedEvent::class, UserEventsListener::class);
 		$context->registerEventListener(UserChangedEvent::class, UserEventsListener::class);
 		$context->registerEventListener(UserUpdatedEvent::class, UserEventsListener::class);
+		$context->registerEventListener(GroupDeletedEvent::class, UserEventsListener::class);
 
 		$context->registerEventListener(SabrePluginAuthInitEvent::class, SabrePluginAuthInitListener::class);
 

apps/dav/lib/Listener/UserEventsListener.php

@@ -20,6 +20,8 @@
 use OCP\Defaults;
 use OCP\EventDispatcher\Event;
 use OCP\EventDispatcher\IEventListener;
+use OCP\Group\Events\BeforeGroupDeletedEvent;
+use OCP\Group\Events\GroupDeletedEvent;
 use OCP\IUser;
 use OCP\IUserManager;
 use OCP\User\Events\BeforeUserDeletedEvent;
@@ -32,7 +34,7 @@
 use OCP\User\Events\UserIdUnassignedEvent;
 use Psr\Log\LoggerInterface;
 
-/** @template-implements IEventListener<UserFirstTimeLoggedInEvent|UserIdAssignedEvent|BeforeUserIdUnassignedEvent|UserIdUnassignedEvent|BeforeUserDeletedEvent|UserDeletedEvent|UserCreatedEvent|UserChangedEvent|UserUpdatedEvent> */
+/** @template-implements IEventListener<UserFirstTimeLoggedInEvent|UserIdAssignedEvent|BeforeUserIdUnassignedEvent|UserIdUnassignedEvent|BeforeUserDeletedEvent|UserDeletedEvent|UserCreatedEvent|UserChangedEvent|UserUpdatedEvent|BeforeGroupDeletedEvent|GroupDeletedEvent> */
 class UserEventsListener implements IEventListener {
 
 	/** @var IUser[] */
@@ -77,6 +79,8 @@ public function handle(Event $event): void {
 			$this->firstLogin($event->getUser());
 		} elseif ($event instanceof UserUpdatedEvent) {
 			$this->updateUser($event->getUser());
+		} elseif ($event instanceof GroupDeletedEvent) {
+			$this->postDeleteGroup($event->getGroup()->getGID());
 		}
 	}
 
@@ -135,6 +139,12 @@ public function postDeleteUser(string $uid): void {
 		unset($this->addressBooksToDelete[$uid]);
 	}
 
+	public function postDeleteGroup(string $gid): void {
+		$encodedGid = urlencode($gid);
+		$this->calDav->deleteAllSharesByUser('principals/groups/' . $encodedGid);
+		$this->cardDav->deleteAllSharesByUser('principals/groups/' . $encodedGid);
+	}
+
 	public function changeUser(IUser $user, string $feature): void {
 		// This case is already covered by the account manager firing up a signal
 		// later on

apps/dav/tests/unit/DAV/Listener/UserEventsListenerTest.php

@@ -182,4 +182,15 @@ public function testDeleteUserAutomationEvent(): void {
 		$this->userEventsListener->preDeleteUser($user);
 		$this->userEventsListener->postDeleteUser('newUser');
 	}
+
+	public function testDeleteGroup(): void {
+		$this->calDavBackend->expects($this->once())
+			->method('deleteAllSharesByUser')
+			->with('principals/groups/testGroup');
+		$this->cardDavBackend->expects($this->once())
+			->method('deleteAllSharesByUser')
+			->with('principals/groups/testGroup');
+
+		$this->userEventsListener->postDeleteGroup('testGroup');
+	}
 }