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Add social login support to a Node.js app using passport.js with OpenID Connect (OIDC) strategy
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README.md

A demo can be found at https://simple-login-passportjs-example.glitch.me

Feel free to Remix it on https://glitch.com/~simple-login-passportjs-example 🙂

Step 1: Bootstrap

Create a folder for the project

mkdir passportjs-example 
cd passportjs-example 

Install express generator:

npm install express-generator -g

Generate the project

express -e .

Install all dependencies:

npm i

Run the project

npm start

Open http://localhost:3000, you should see this empty page

Step 2: Bootstrap OpenID

Install dotenv

npm install dotenv --save

Load dotenv, add the following lines on top of app.js:

require('dotenv').config()

Create the .env file based on the .env.example one:

cp .env.example .env

Get the OAuth-Client-Id and OAuth-Client-Secret from your SimpleLogin app and make sure to fill up the corresponding values in .env

Install passport passport-openidconnect express-session

npm install passport@0.4.0 passport-openidconnect@0.0.2 express-session@1.15.6 --save

Add the following lines to app.js just below var logger = require('morgan'); to import passport:

var session = require('express-session');
var passport = require('passport');
var OidcStrategy = require('passport-openidconnect').Strategy;

At this step, npm start should still work and http://localhost:3000 is still this empty page.

Step 3: Config passport.js

Just below app.use(express.static(path.join(__dirname, 'public')));, add the following line to init passport.js.

The first part is to config session for passport.js, please make sure to replace very-secret if you decide to deploy the code on production 😎. We also need to tell passport.js how to serialize/deserialize user from/to session.

The second part is to setup passport.js with OIDC endpoints and with the OAuth credential parsed from the .env file setup in previous step.

// passportjs use session to store user info
app.use(session({
  secret: 'very-secret',
  resave: false,
  saveUninitialized: true
}));

app.use(passport.initialize());
app.use(passport.session());

passport.serializeUser((user, next) => {
  next(null, user);
});

passport.deserializeUser((obj, next) => {
  next(null, obj);
});

// config different OIDC endpoints
passport.use('oidc', new OidcStrategy({
  issuer: 'https://app.simplelogin.io',
  authorizationURL: 'https://app.simplelogin.io/oauth2/authorize',
  tokenURL: 'https://app.simplelogin.io/oauth2/token',
  userInfoURL: 'https://app.simplelogin.io/oauth2/userinfo',
  clientID: process.env.CLIENT_ID, // OAuth config from env thanks to dotenv
  clientSecret: process.env.CLIENT_SECRET,
  callbackURL: 'http://localhost:3000/authorization-code/callback',
  scope: 'openid profile'
}, (issuer, sub, profile, accessToken, refreshToken, done) => {
  return done(null, profile);
}));

Step 4: OpenID Connect Flow

The social login starts by redirecting user to the Social Login Provider authorization page. Once user approves sharing their data with the app, user gets redirected back to the callback endpoint with a code in url that we'll use to exchange for access token. This access token will then allow us to get user information.

We would need the following routes:

  • /login for redirecting user to the authorization page
  • /authorization-code/callback to received the code when user is redirected back from authorization page.
  • (Optional) /profile page to show the obtained user information.

Let's start by adding a "Login" button onto the home page: in views/index.ejs, add this line just before </body>

<a href="/login">Log In</a>

Create a profile page to show user information. In the same terminal, create a profile.ejs file by touch views/profile.ejs and add this content to this file:

<!DOCTYPE html>
<html>
  <head>
    <title><%= title %></title>
    <link rel='stylesheet' href='/stylesheets/style.css' />
  </head>
  <body>
    <h1><%= title %></h1>
    <p>Welcome <%= user.name %>!</p>    
    <p>Email: <%= user.email %></p>
    <img src="<%= user.avatar_url %>">
    <a href="/">Home</a>
  </body>
</html>

Now let's add the 3 endpoints /login, /authorization-code/callback, /profile just below the code we added in the previous step:

// redirect user to authorization page
app.use('/login', passport.authenticate('oidc'));

// user is redirected back with the *code*
app.use('/authorization-code/callback',
  passport.authenticate('oidc', {
    failureRedirect: '/error'
  }),
  (req, res) => {
    // redirect user to /profile so they can see their information
    res.redirect('/profile');
  }
);

// show user info
app.use('/profile', (req, res) => {
  console.log("user:", req);
  res.render('profile', {
    title: 'User Info',
    user: req.user._json
  });
});

Now re-run npm start, http://localhost:3000 should show this login button and clicking on the login button should open the authorization page.

Authorization page

User gets redirected back to our app:

Congratulations, you just add social login to a Node.js app using passport.js with OpenID Connect strategy!

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