authHelper.js

var credentials = require('./credentials')
var oauth2 = require('simple-oauth2')(credentials.oauthcred);
// var redirectUri = "https://data.lohud.com/bots/trellobot/authorize";
// var redirectUri = "http://localhost:8080/authorize";
var redirectUri = "https://trellobot.lohudblogs.com/authorize";


//  The Scopes the app requires
var scopes = [ "openid",
               "https://outlook.office.com/mail.read",
               "profile",
               "offline_access" ];

var getAuthUrl = function() {
    var returnVal = oauth2.authCode.authorizeURL({
        redirect_uri: redirectUri,
        scope: scopes.join(" ")
    });
    // console.log("Generated auth url: " + returnVal);
    return returnVal;
};

var getTokenFromCode = function(auth_code, callback, res) {
    var token;
    // console.log(auth_code);
    oauth2.authCode.getToken({
        code: auth_code,
        redirect_uri: redirectUri,
        scope: scopes.join(" ")
        }, function (error, result) {
          if (error) {
            console.log("Access token error: ", error.message);
            callback(res, error, null);
          } else {
            token = oauth2.accessToken.create(result);
            callback(res, null, token);
          }
    });
};

var getEmailFromIdToken = function(id_token) {
    // JWT is in three parts, separated by a '.'
    var token_parts = id_token.split('.');

    // Token content is in the second part, in urlsafe base64
    var encoded_token = new Buffer(token_parts[1].replace("-", "+").replace("_", "/"), 'base64');

    var decoded_token = encoded_token.toString();

    var jwt = JSON.parse(decoded_token);
    // Email is in the preferred_username field
    return jwt.preferred_username
};

module.exports = {
    getAuthUrl: getAuthUrl,
    getTokenFromCode: getTokenFromCode,
    getEmailFromIdToken: getEmailFromIdToken
}