Method for logging with Facebook. The whole file is available https://github.com/AndrejGajdos/auth-flow-spa-node-react/blob/master/script/views/components/LoginForm/LoginForm.jsx

LoginForm.jsx

onFacebookLogin = () => {
    const inOneHour = new Date(new Date().getTime() + 60 * 60 * 1000);
    Cookies.set('lastLocation_before_logging', this.props.location.pathname, { expires: inOneHour });
    window.location.href = `${window.location.origin}/auth/facebook`;
  };