Google OAuto Example

google-oauth-example.js

let express = require('express');
let google = require('googleapis');
let app = express();

const CLIENT_ID = 'client-id';
const CLIENT_SECRET = 'client-secret';
const REDIRECT_URL = 'redirect-url';

let OAuth2 = google.auth.OAuth2;
let oauth2Client = new OAuth2(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);
let plus = google.plus('v1');

app.use(express.static('public'));

/*
 * Redirect 수신
 */
app.get('/oauth/callback', (req, res) => {
  oauth2Client.getToken(req.query.code, function (err, tokens) {
    if (err) {
      console.error(err);
    }

    oauth2Client.setCredentials(tokens);
    plus.people.get({ userId: 'me', auth: oauth2Client }, (err, response) => {
      if (err) {
        return console.error(err);
      }

      //TODO: 사용자 정보를 쿠키든 세션이든 저장. 말하자면 로그인
      res.redirect('/index.html');
    });
  });
});

app.post('/login', (req, res) => {
  res.redirect(oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: 'https://www.googleapis.com/auth/plus.me'
  }));
});

app.listen(process.env.PORT || 4000, () => {
  console.log('ready %s', process.env.PORT || 4000);
});