I am using Passport on my node.js app and I am currently using an Username to login.

On my user register page, I have allow the user to register their unique username and email.

I want a login page with Sign in Using username/email: ________

Where the script can detect if there is a @ in the field and look up the email instead of username.

I have tried for a few hours with no avail.

here is my passport.js

var mongoose = require('mongoose')

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



var User = mongoose.model('User');



module.exports = function(passport, config){



passport.serializeUser(function(user, done){

    done(null, user.id);

})



passport.deserializeUser(function(id, done) {

    User.findOne({ _id: id }, function (err, user) {

        done(err, user);

    });

});



passport.use(new LocalStrategy({

    usernameField: 'username',

    passwordField: 'password'

    }, function(username, password, done) {

    User.isValidUserPassword(username, password, done);

    }));

}

EDIT: below is the user.js as requested

var mongoose = require('mongoose');

var hash = require('../util/hash.js');



UserSchema = mongoose.Schema({

username:  String,

email:      String,

salt:       String,

hash:       String

})



UserSchema.statics.signup = function(username, email, password, done){

var User = this;



hash(password, function(err, salt, hash){

    if(err) throw err;

    // if (err) return done(err);

    User.create({

        username : username,

        email: email,

        salt : salt,

        hash : hash

    }, function(err, user){

        if(err) throw err;

        // if (err) return done(err);

        done(null, user);

    });

});

}



UserSchema.statics.isValidUserPassword = function(username, password, done) {

this.findOne({username : username}, function(err, user){

    // if(err) throw err;

    if(err) return done(err);

    if(!user) return done(null, false, { message : 'Incorrect username.' });

    hash(password, user.salt, function(err, hash){

        if(err) return done(err);

        if(hash == user.hash) return done(null, user);

        done(null, false, {

            message : 'Incorrect password'

        });

    });

});

};



var User = mongoose.model(User, UserSchema);



module.exports = User;