feat: add command to clear avatar cache

README.md

@@ -111,6 +111,10 @@ and `avatar.url = https://avatar-cache.your-nextcloud.com/`:
 For additional security, we recommend to disable directory listing, symlinks and
 any language interpreter such as php for the cache directory.
 
+Cached avatars are usually deleted as soon as the meeting ends. In cases the BBB
+server shuts down unexpected, we provide the `bbb:clear-avatar-cache` occ
+command (example use: `./occ bbb:clear-avatar-cache`).
+
 
 ## :bowtie: User guide
 

appinfo/info.xml

@@ -45,6 +45,9 @@ Developer wanted! If you have time it would be awesome if you could help to enha
         <lib>SimpleXML</lib>
         <nextcloud min-version="20" max-version="23"/>
     </dependencies>
+    <commands>
+        <command>OCA\BigBlueButton\Command\ClearAvatarCache</command>
+    </commands>
     <settings>
         <admin>OCA\BigBlueButton\Settings\Admin</admin>
         <personal-section>OCA\BigBlueButton\Settings\Section</personal-section>

lib/Command/ClearAvatarCache.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace OCA\BigBlueButton\Command;
+
+use OCA\BigBlueButton\AvatarRepository;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class ClearAvatarCache extends Command {
+
+	/**
+	 * @var AvatarRepository
+	 */
+	private $avatarRepository;
+
+	public function __construct(
+		AvatarRepository $avatarRepository
+	) {
+		parent::__construct();
+		$this->avatarRepository = $avatarRepository;
+	}
+
+	protected function configure() {
+		$this->setName('bbb:clear-avatar-cache');
+		$this->setDescription('Clear all avatars in cache');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output) {
+		$stats = $this->avatarRepository->clearAllRooms();
+
+		$output->writeln("Removed " . $stats["files"] . " avatars in " . $stats["rooms"] . " rooms");
+
+		return 0;
+	}
+}