Publish the signaling mode as initial state

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Config.php

@@ -30,6 +30,9 @@ use OCP\Security\ISecureRandom;
 
 class Config {
 
+	public const SIGNALING_INTERNAL = 'internal';
+	public const SIGNALING_EXTERNAL = 'external';
+
 	/** @var IConfig */
 	protected $config;
 	/** @var ITimeFactory */
@@ -274,6 +277,13 @@ class Config {
 		);
 	}
 
+	public function getSignalingMode(): string {
+		if (empty($this->getSignalingServers())) {
+			return self::SIGNALING_INTERNAL;
+		}
+		return self::SIGNALING_EXTERNAL;
+	}
+
 	/**
 	 * Returns list of signaling servers. Each entry contains the URL of the
 	 * server and a flag whether the certificate should be verified.

lib/TInitialState.php

@@ -49,6 +49,11 @@ trait TInitialState {
 			'talk', 'prefer_h264',
 			$this->serverConfig->getAppValue('spreed', 'prefer_h264', 'no') === 'yes'
 		);
+
+		$this->initialStateService->provideInitialState(
+			'talk', 'signaling_mode',
+			$this->talkConfig->getSignalingMode()
+		);
 	}
 
 	protected function publishInitialStateForUser(IUser $user, IRootFolder $rootFolder, IAppManager $appManager): void {