Theoretical fixes

Author: Tarpsvo

src/CloudTasksQueue.php

@@ -168,7 +168,7 @@ protected function pushToCloudTasks($queue, $payload, $delay = 0)
 
         $token = new OidcToken;
         $token->setServiceAccountEmail($this->config['service_account_email']);
-        $token->setAudience($this->getAudience());
+        if ($audience = $this->getAudience()) $token->setAudience($audience);
         $httpRequest->setOidcToken($token);
 
         if ($availableAt > time()) {

src/Config.php

@@ -88,10 +88,8 @@ public static function getHandler($handler): string
      */
     public static function getAudience(array $config): string
     {
-        $handler = self::getHandler($config['handler']);
-
         return $config['signed_audience'] ?? false
-            ? hash_hmac('sha256', $handler, config('app.key'))
-            : $handler;
+            ? hash_hmac('sha256', self::getHandler($config['handler']), config('app.key'))
+            : null;
     }
 }