gistfile1.js

app.factory( 'AuthService', function($http, $location, $rootScope) {
  return {
    login: function(email, password) {
      currentUser = $http({method: "POST", url: "/login", params:  {email: email, password: password}}).
        success(function(data, status){
          $rootScope.current_user = data.user
          return $location.path("/feed");
        }).
        error(function(data, status){
          return $location.path("/login");
        });
      },
    logout: function() {  },
    isLoggedIn: function() {
      $rootScope.current_user !== undefined
     },
  };
});