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NodeJS Passport integration

Local authentication


The passport-local module is used to implement a local authentication.

This module lets you authenticate using a username and password in your Node.js applications.

Registering the user :

const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
// A named strategy is used since two local strategy are used :
// one for the registration and the other to sign-in
passport.use('localSignup', new LocalStrategy({
 // Overriding defaults expected parameters,
 // which are 'username' and 'password'
 usernameField: 'email',
 passwordField: 'password',
 passReqToCallback: true // allows us to pass back the entire request to the callback .
},
function(req, email, password, next) {
 // Check in database if user is already registered
 findUserByEmail(email, function(user) {
 // If email already exists, abort registration process and
 // pass 'false' to the callback
 if (user) return next(null, false);
 // Else, we create the user
 else {
 // Password must be hashed !
 let newUser = createUser(email, password);
 newUser.save(function() {
 // Pass the user to the callback
 return next(null, newUser);
 });
 }
 });
});

Logging in the user :

const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
passport.use('localSignin', new LocalStrategy({
 usernameField : 'email',
 passwordField : 'password',
},
function(email, password, next) {
 // Find the user
 findUserByEmail(email, function(user) {
 // If user is not found, abort signing in process
 // Custom messages can be provided in the verify callback
 // to give the user more details concerning the failed authentication
 if (!user)
return next(null, false, {message: 'This e-mail address is not associated with any
account.'});
 // Else, we check if password is valid
 else {
 // If password is not correct, abort signing in process
 if (!isPasswordValid(password)) return next(null, false);
 // Else, pass the user to callback
 else return next(null, user);
 }
 });
});

Creating routes :

// ...
app.use(passport.initialize());
app.use(passport.session());
// Sign-in route
// Passport strategies are middlewares
app.post('/login', passport.authenticate('localSignin', {
 successRedirect: '/me',
 failureRedirect: '/login'
});
// Sign-up route
app.post('/register', passport.authenticate('localSignup', {
 successRedirect: '/',
 failureRedirect: '/signup'
});
// Call req.logout() to log out
app.get('/logout', function(req, res) {
 req.logout();
 res.redirect('/');
});
app.listen(3000);


Conclusion

In this page (written and validated by ) you learned about NodeJS Passport integration . What's Next? If you are interested in completing NodeJS tutorial, your next topic will be learning about: NodeJS Dependency Injection.



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