fix: #288 expose app capabilities

Signed-off-by: Sebastien Marinier <sebastien.marinier@arawa.fr>

lib/AppInfo/Application.php

@@ -56,6 +56,8 @@ class Application extends App implements IBootstrap {
 
 		$context->registerMiddleware(JoinMiddleware::class);
 		$context->registerMiddleware(HookMiddleware::class);
+
+		$context->registerCapability(Capabilities::class);
 	}
 
 	public function boot(IBootContext $context): void {

lib/AppInfo/Capabilities.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace OCA\BigBlueButton\AppInfo;
+
+use OCA\BigBlueButton\Permission;
+use OCP\App\IAppManager;
+use OCP\Capabilities\ICapability;
+use OCP\IUserSession;
+
+class Capabilities implements ICapability {
+	public function __construct(private IUserSession $userSession, private IAppManager $appManager, private Permission $permission) {
+	}
+
+	public function getCapabilities(): array {
+		$user = $this->userSession->getUser();
+		if (!$user) {
+			return [];
+		}
+		$restriction = $this->permission->getRestriction($user->getUID());
+		$capabilities = array_filter($restriction->jsonSerialize(), function ($key) {
+			return in_array($key, ['maxRooms', 'maxParticipants', 'allowRecording']);
+		}, ARRAY_FILTER_USE_KEY);
+
+		return [
+			Application::ID => array_merge([
+				'appVersion' => $this->appManager->getAppVersion(Application::ID),
+				'isAllowedToCreateRoom' => $this->permission->isAllowedToCreateRoom($user->getUID()),
+			], $capabilities)
+		];
+	}
+}