$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'));

}]);