Add listener for GroupDeletedEvent to drop this group as collaborator

Signed-off-by: Simon Spannagel <simonspa@kth.se>

2 files changed, 53 insertions, 0 deletions

diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 64e34826..11507922 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -29,12 +29,15 @@ use OCA\DAV\Events\SabrePluginAuthInitEvent;
 use OCA\Photos\Listener\SabrePluginAuthInitListener;
 use OCA\DAV\Connector\Sabre\Principal;
 use OCA\Photos\Listener\NodeDeletedListener;
+use OCA\Photos\Listener\GroupUserRemovedListener;
+use OCA\Photos\Listener\GroupDeletedListener;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\Files\Events\Node\NodeDeletedEvent;
 use OCP\Group\Events\UserRemovedEvent;
+use OCP\Group\Events\GroupDeletedEvent;
 
 class Application extends App implements IBootstrap {
 	public const APP_ID = 'photos';
@@ -71,6 +74,8 @@ class Application extends App implements IBootstrap {
 
 		$context->registerEventListener(UserRemovedEvent::class, GroupUserRemovedListener::class);
 
+		$context->registerEventListener(GroupDeletedEvent::class, GroupDeletedListener::class);
+
 		$context->registerEventListener(SabrePluginAuthInitEvent::class, SabrePluginAuthInitListener::class);
 	}
 
diff --git a/lib/Listener/GroupDeletedListener.php b/lib/Listener/GroupDeletedListener.php
new file mode 100644
index 00000000..34d4bb3c
--- /dev/null
+++ b/lib/Listener/GroupDeletedListener.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace OCA\Photos\Listener;
+
+use OCA\Photos\Album\AlbumMapper;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Group\Events\GroupDeletedEvent;
+
+class GroupDeletedListener implements IEventListener {
+	private AlbumMapper $albumMapper;
+
+	public function __construct(AlbumMapper $albumMapper) {
+		$this->albumMapper = $albumMapper;
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof GroupDeletedEvent)) {
+			return;
+		}
+        
+        // Get all shared albums for this group:
+        $albums_group = $this->albumMapper->getSharedAlbumsForCollaboratorWithFiles($event->getGroup()->getGID(), AlbumMapper::TYPE_GROUP);
+
+        // Get all users of this group:
+        $users = $event->getGroup()->getUsers();
+
+        foreach ($users as $user) {
+            $uid = $user->getUID();
+
+            // Get all albums shared with this specific user:
+            $albums_user = $this->albumMapper->getSharedAlbumsForCollaboratorWithFiles($user->getUID(), AlbumMapper::TYPE_USER);
+            
+            // Get all group-shared albums that are not directly shared with the removed user in addition
+            $albums = array_udiff($albums_group, $albums_user, fn ($a, $b) => ($a->getAlbum()->getId() - $b->getAlbum()->getId()));
+
+
+            // Remove their photos from theses albums:
+            foreach ($albums as $album) {
+                $this->albumMapper->removeFilesForUser($album->getAlbum()->getId(), $user->getUID());
+            }
+        }
+
+        foreach ($albums_group as $album) {
+            $this->albumMapper->deleteGroupFromAlbumCollaboratorsList($event->getGroup()->getGID(), $album->getAlbum()->getId());
+        }
+	}
+}