FacebookViewer

A mini-project to practice Passport/Node.js

Objectives

Create a simple app that shows Facebook Profile information.

You can use the passport-facebook GitHub repo for a guide.

Step 1: Set up passport, passport-facebook, express

Set up a index.js file and include these npm dependencies:

• express
• express-session
• passport
• passport-facebook

Go over to the Facebook Developer Portal and Add a New App. Call it whatever you'd like.

Now let's put in the code necessary to get our authentication working:

• Create your express app, have it listen to a port that works for you

• Require passport and the passport FacebookStrategy
  const passport = require('passport')
const FacebookStrategy = require('passport-facebook').Strategy

• Include the session middleware
  app.use(session({ secret: 'some-random-string' }))

• Include the passport.initialize middleware
  app.use(passport.initialize())

• Include the passport.session middleware
  app.use(passport.session())

• Define the FacebookStrategy

  passport.use(new FacebookStrategy({
    clientID: '<your_client_id>',
    clientSecret: '<your_client_secret>',
    callbackURL: 'http://localhost:3000/auth/facebook/callback'
  }, function(token, refreshToken, profile, done) {
    return done(null, profile);
  }));

Step 2: Define your auth endpoints

Create two routes that will handle your Facebook auth.

GET /auth/facebook

This route simply implements the passport.authenticate method, passing 'facebook' as the parameter.

GET /auth/facebook/callback

This route needs to pass the passport.authenticate method again, except we also need to pass in an object that passes the successRedirect and failureRedirect paths.

Step 3: Create the deserialize/serializer methods on passport.

Since you won't be doing anything further than just passing objects to/from passport and the session, we just need bare bones methods here:

passport.serializeUser(function(user, done) {
  done(null, user);
});

passport.deserializeUser(function(obj, done) {
  done(null, obj);
});

Step 4: Create viewer endpoint

Now we're going to create an endpoint that returns the current logged in user's Facebook profile data.

GET /me

Create this route in your index.js that returns the user's Facebook profile data. The data is stored in req.user if you've set everything up correctly. Return a JSON representation of this data at the /me endpoint.

Use Postman or the browser to verify that you can in fact get the JSON data from the /me endpoint.

Copyright

© DevMountain LLC, 2016. Unauthorized use and/or duplication of this material without express and written permission from DevMountain, LLC is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to DevMountain with appropriate and specific direction to the original content.