Angular AUTH example

authentication.js

angular.module('app')
.factory('authentication', [
  'user',
  '$state',
  function(user, $state){
    return {
      authenticate: function(protect){
        return user.identify()
        .then(function(){
          return true;
        })
        .catch(function(){
          if (protect){
            $state.go('login');
          }
          return false;
        });
      }
    };
  }
]);

homeController.js

angular.module('app')
.controller('homeController', [
  'isLoggedIn',
  'user'
  function(isLoggedIn, user){
    // here, isLoggedIn is a boolean of whether the user is logged in or not.
  }
])

route.js

angular.module('app')
.config([
  '$stateProvider',
  function($stateProvider){
    $stateProvider
    .state('home', {
      url: '/',
      controller: 'homeController',
      // add this to any route that you'd like to protect.
      resolve: {
        isLoggedIn: [
          'authentication',
          function(authentication){
            return authentication.authenticate();
          }
        ]
      }  
    })
    .state('login', {
      url: '/login'
    })
    
  }
])

user.js

angular.module('app')
.factory('user', [
  '$http',
  '$q',
  function($http, $q){
    var User = function(){
      this.name = null;
    };
    
    User.prototype.isLoggedIn = function(){
      // however this is done. You can a "loggedIn" variable in closure or something.
    };
  
    User.prototype.identify = function(){
      if(this.isLoggedIn()){
        return $q.when(true)
      }
      return $http.get("/auth", cookie) // this can be a cookie, or whatever token is used
    };
    
    return new User()
  }
]);

Check out the demo of ngAuth module see if you can make it work for what you need.

https://github.com/appmux/adhesive.js