SPA Authentication AngularJS -> PassportJS -> MongoDB - node.js

Question

I am trying for days to setup Passport on SPA page. On Client Side I am using AngularJS $http and generally it's working.
angular.module('Factory', []).factory('MainFactory', ['$http',function($http) {
return {
RegisterNewAccount : function(AccountInformation) {
return $http.post('/api/PageSignup', AccountInformation);
}
}
}]);
angular.module('Controllers', [])
.controller('MainPage', ['$scope','MainFactory', function($scope, MainFactory) {
$scope.Signup = function(){
var account = {
email: $scope.RegisterEmail,
password: $scope.RegisterPassword
};
MainFactory.RegisterNewAccount(account)
.success(function(data) {
console.log(data);
});
};
}]);
My problem is on server side code, i am new to passport and still cant figure it out how to make it work without redirect thing. My passport setup is below:
var passport = require('passport');
var LocalStrategy= require('passport-local').Strategy;
passport.use('local-signup', new LocalStrategy({
usernameField : 'email',
passwordField : 'password',
passReqToCallback : true
},
function(req, email, password, done) {
if (email) email = email.toLowerCase();
process.nextTick(function() {
if (!req.user) {
User.findOne({ 'local.email' : email }, function(err, user) {
if (err) return done(err);
if (user) return done(null, false, { message: 'That email is already taken.' });
else {
var newUser = new User();
newUser.local.email = email;
newUser.local.password = newUser.generateHash(password);
newUser.save(function(err) {
if (err) return done(err);
return done(null, newUser);
});
}
});
} else if ( !req.user.local.email ) {
User.findOne({ 'local.email' : email }, function(err, user) {
if (err) return done(err);
if (user) {
return done(null, false, { message: 'That email is already taken.'});
} else {
var user = req.user;
user.local.email = email;
user.local.password = user.generateHash(password);
user.save(function (err) {
if (err)
return done(err);
return done(null,user);
});
}
});
} else {
return done(null, req.user);
}
});
}));
var app = express();
app.post('/api/PageSignup', function(req, res, next) {
passport.authenticate('local-signup', function(err, user, info) {
if (err) { return next(err) }
if (!user) {
return res.send(info.message);
}
req.logIn(user, function(err) {
return res.send(user);
});
})(req, res, next);
});
If there are clear example on SPA Authentication with passport please show me.
Overwise can you show me where I am mistaking in my server side code?