middleware('guest')->except('logout');
    }

    /**
     * Get the failed login response instance.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Symfony\Component\HttpFoundation\Response
     *
     * @throws \Illuminate\Validation\ValidationException
     */
    protected function sendFailedLoginResponse(Request $request)
    {
        throw ValidationException::withMessages([
            'username' => [trans('auth.failed')],
        ]);
    }

    /**
     * Get the login username to be used by the controller.
     *
     * @return string
     */
    public function username()
    {
        $login = request()->input('username');

        if(is_numeric($login)){
            $field = 'phone';
        } elseif (filter_var($login, FILTER_VALIDATE_EMAIL)) {
            $field = 'email';
        } else {
            $field = 'username';
        }

        request()->merge([$field => $login]);

        return $field;
    }
}