Auth with Google and use APIs.

• create a project in console.developers.google.com
• in project, create OAuth credentials and fill:
  • 'Authorized JavaScript origins' with http://localhost:3000 and <production-domain>
  • 'Authorized redirect URIs' with http://localhost:3000/authcallback and <production-domain>/authcallback
• create .env file with following entries from the credentials: CLIENT_ID, CLIENT_SECRET, REDIRECT_URL
• run server locally - $ npm run start

using OAuth2 Google library, creds are stored in cookies

because of how Google OAuth works you can only be logged in on local or production version at a given time

(revoke access here if it auth trouble)