frontend/src/auth/index.js


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import { LOG_IN_SUCCEEDED, LOG_OUT } from "../actions/auth";
import { DELETE_CURRENT_USER_SUCCEEDED } from "../actions/users";

const getAuthObject = () => {
  const authItem = localStorage.getItem("auth");
  if (!authItem || authItem === "{}") {
    return undefined;
  }
  return JSON.parse(authItem);
};

export const userIsLoggedIn = () => {
  const authObj = getAuthObject();

  if (!authObj || !authObj.googleId) {
    return false;
  }

  const currentTime = new Date().getTime();
  return parseInt(authObj.expiresAt, 10) - currentTime > 0;
};

export const getAuthToken = () => {
  const authObj = getAuthObject();
  if (!authObj) {
    return undefined;
  }

  return authObj.authToken;
};

export const saveAuthLocalStorage = payload => {
  localStorage.setItem("auth", JSON.stringify(payload));
};

export const clearAuthLocalStorage = () => {
  localStorage.setItem("auth", "");
};

export const authRedirectMiddleware = store => next => action => {
  switch (action.type) {
    case LOG_IN_SUCCEEDED:
      saveAuthLocalStorage(action.payload);
      window.location.href = "/simulations";
      break;
    case LOG_OUT:
    case DELETE_CURRENT_USER_SUCCEEDED:
      clearAuthLocalStorage();
      window.location.href = "/";
      break;
    default:
      next(action);
      return;
  }

  next(action);
};