firebase_roles.js

firebase.auth().currentUser.getIdToken()
  .then((idToken) => {
     // Parse the ID token.
     const payload = JSON.parse(b64DecodeUnicode(idToken.split('.')[1]));
     var role = payload['role'];
     if (role == 'moderator') {
       showModeratorUI();
     } else {
       showArticleFeed();
     }
  })
  .catch((error) => {
    console.log(error);
  }