Require a distributed MemCache

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

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/TInitialState.php b/lib/TInitialState.php
index 7452436de..6004f7538 100644
--- a/lib/TInitialState.php
+++ b/lib/TInitialState.php
@@ -23,10 +23,12 @@ declare(strict_types=1);
 namespace OCA\Talk;
 
 
+use OC\HintException;
 use OC\User\NoUserException;
 use OCP\App\IAppManager;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotPermittedException;
+use OCP\ICacheFactory;
 use OCP\IConfig;
 use OCP\IInitialStateService;
 use OCP\IUser;
@@ -40,6 +42,8 @@ trait TInitialState {
 	protected $serverConfig;
 	/** @var IInitialStateService */
 	protected $initialStateService;
+	/** @var ICacheFactory */
+	protected $memcacheFactory;
 
 	protected function publishInitialStateShared(): void {
 		// Needed to enable the screensharing extension in Chromium < 72.
@@ -50,6 +54,13 @@ trait TInitialState {
 			$this->serverConfig->getAppValue('spreed', 'prefer_h264', 'no') === 'yes'
 		);
 
+		$signalingMode = $this->talkConfig->getSignalingMode();
+		if ($signalingMode !== 'internal' && !$this->memcacheFactory->isAvailable()) {
+			throw new HintException(
+				'External signaling is only supported with a distributed cache'
+			);
+		}
+
 		$this->initialStateService->provideInitialState(
 			'talk', 'signaling_mode',
 			$this->talkConfig->getSignalingMode()