var passport = require('passport')
  , LocalStrategy = require('passport-local').Strategy;

passport.use(new LocalStrategy(
  function(username, password, done) {
    if (password == undefined) {
        // create a user
        User.findOne({ username: username }, function (err, user) {
            if (err) { return done(err); }
            return done(null, user);
        });
    } else {
        User.findOne({ username: username, password: password }, function (err, user) {
            if (err) { return done(err); }
            if (!user) {
                return done(null, false, { message: 'Incorrect username or password' });
            }

            return done(null, user);
        });
    }
  }
));