public function sendPush(string $pushTitle, string $pushBody, User $user){
        $serviceAccount = ServiceAccount::fromJsonFile($this->dir);
        $firebase = (new Factory())
            ->withServiceAccount($serviceAccount)
            ->create();
        if(null !== $user->getDeviceTokens()){
                foreach ($user->getDeviceTokens() as $token){

                    try {
                        return $firebase->getAuth()->verifyIdToken($token->getToken());
                    } catch (IssuedInTheFuture $e) {
                        exit;
                    } catch (InvalidToken $e) {
                        echo $e->getMessage();
                        exit;
                    }

                $messaging = $firebase->getMessaging();
                $message = CloudMessage::fromArray([
                    'token' => $token->getToken(),
                    'notification' => [
                        'title' => $pushTitle,
                        'body' => $pushBody
                    ]
                ]);
                try{
                    $messaging->send($message);
                }catch(\Kreait\Firebase\Exception\Messaging\NotFound $e){
                    dump('Error');
                }
            }
        }
    }