passport-config.js

const passport = require('passport');
const {User} = require('./models');
const LocalStrategy = require('passport-local');

function configurePassport(app) {
	app.use(passport.initialize());
	app.use(passport.session());
	passport.serializeUser(function(user, done) {
  		done(null, user._id);
	});

	passport.deserializeUser(function(id, done) {
		User.findById(id, function(err, user) {
		    done(err, user);
		});
	});

	passport.use(new LocalStrategy(
		function(username, password, done) {
		    User.findOne({ username: username }, function(err, user) {
		      if (err) { return done(err); }
		      if (!user) {
		        return done(null, false, { message: 'Incorrect username.' });
		      }
		      if (!user.validPassword(password)) {
		        return done(null, false, { message: 'Incorrect password.' });
		      }
		      return done(null, user);
		 });
		}
	));

	this.passport = passport;

	return passport;
}

module.exports = configurePassport;