$app->post('auth/refresh-token', ['middleware' => 'jwt.refresh', function() {
  try {
    $old_token = JWTAuth::getToken();
    $token = JWTAuth::refresh($old_token);
    JWTAuth::invalidate($old_token);
  } catch (TokenExpiredException $e) {
    throw new AuthException(
      Constants::get('error_code.refresh_token_expired'),
      trans('errors.refresh_token_expired'), $e);
  } catch (JWTException $e) {
    throw new AuthException(
      Constants::get('error_code.token_invalid'),
      trans('errors.token_invalid'), $e);
  }
 
  return response()->json(compact('token'));
}]);