Authentication Angularjs Factory uses localStorage

authToken.js

'use strict';

angular.module('psJwtApp')
  .factory('authToken', function ($window) {
    var storage = $window.localStorage;
    var cachedToken;
    var userToken = 'userToken';
    var authToken =  {
      setToken: function(token) {
        cachedToken = token;
        storage.setItem(userToken, token);
      },
      getToken: function() {
        if(!cachedToken)
          cachedToken= storage.getItem(userToken);
        return cachedToken;
      },
      isAuthenticated: function() {
        return !!authToken.getToken();
      },
      removeToken: function() {
        cachedToken = null;
        localStorage.removeItem(userToken);
      }
    };
    return authToken;
  });