Establish Session

In the previous section, you added a route to authenticate the user when Facebook rediects them back to the app. In this section, you'll establish a login session which will maintain the user's authenticated state as they navigate the app.

You already added session support to the app in order to maintain state between redirects. This session support will also be used to maintain a login session.

Open app.js and require() Passport at line 9, below require('express-session').

var session = require('express-session');
var passport = require('passport');

Add the following code at line 35, after session() middleware, which will authenticate the session.

app.use(session({
  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: false,
  store: new SQLiteStore({ db: 'sessions.db', dir: './var/db' })
}));
app.use(passport.authenticate('session'));

Finally, configure Passport to persist user information in the login session. Open routes/auth.js and add the following code at line 47.

passport.serializeUser(function(user, cb) {
  process.nextTick(function() {
    cb(null, { id: user.id, username: user.username, name: user.name });
  });
});

passport.deserializeUser(function(user, cb) {
  process.nextTick(function() {
    return cb(null, user);
  });
});

Now try signing in. Open http://localhost:3000, click "Sign in" and then click "Sign in with Facebook."

You are signed in! Go ahead and enter some tasks you've been needing to get done.

At this point, you have built an app that allows users to sign in with Facebook! Next, you will add sign out.