Authenticate with google calendar and store token for next use.

indexWithConfig.js

const gEvent = require('vorpal')();
const {google} = require('googleapis');
const opn = require('opn');

const utils = require('./utils');

const CLIENT_ID = 'GOOGLE_CLIENT_ID';
const CLIENT_SECRET = 'GOOGLE_CLIENT_SECRET';
const REDIRECT_URL = 'urn:ietf:wg:oauth:2.0:oob';

const oauth2Client = new google.auth.OAuth2(
  CLIENT_ID,
  CLIENT_SECRET,
  REDIRECT_URL
);

// generate a url that asks permissions for Google Calendar scopes
const scopes = [
  'https://www.googleapis.com/auth/calendar',
  'https://www.googleapis.com/auth/calendar.readonly'
];

let url;
// set credentials if already present else create a url to connect
if (utils.checkAuth()) {
  oauth2Client.setCredentials(utils.readConfig());
} else {
  url = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: scopes
  });
}

gEvent
  .command('connect')
  .description('Connect to your google account')
  .action(function (args, callback) {
    if (utils.checkAuth()) {
      this.log('You are already connected.');
      return callback();
    }
    opn(url);
    callback();
  });

gEvent
  .command('authorize <code>')
  .description('Authorize your account with token')
  .action(async function (args, callback) {
    if (utils.checkAuth()) {
      this.log('You are already connected.');
      return callback();
    }
    const {tokens} = await oauth2Client.getToken(args.code);
    oauth2Client.setCredentials(tokens);

    // Store tokens for next use
    utils.writeConfig(tokens);
    callback();
  });

gEvent
  .command('disconnect')
  .description('Disconnect the current google account')
  .action(async function (args, callback) {
    // Simply erase the access_token and refresh_token
    utils.writeConfig({});
    callback();
  });

gEvent
  .delimiter('gevent $')
  .show();