gistfile1.js

app.factory('Auth', function (Firebase, $rootScope, $localStorage) {

  var auth = new FirebaseSimpleLogin(Firebase.reference, function (error, user) {
    if (error) {
      $rootScope.$emit('firebase.error', error);
    } else if (user) {
      // We have user
      $localStorage.current_user = user;
      $localStorage.logged_in    = true;

      $rootScope.$emit('firebase.logged_in');
    } else {
      // No user
      $localStorage.logged_in = false;
    }
  });

  var login = function (email, password) {
    auth.login('password', {
      email: email,
      password: password,
      rememberMe: true
    });
  };

  var logout = function () {
    auth.logout();
    $localStorage.current_user = {};
    $localStorage.logged_in    = false;
  };

  var register = function (email, password) {
    auth.createUser(email, password, function (error, user) {
      if (error) {
        $rootScope.$emit('firebase.error', error);
      } else {
        // We have user
        $localStorage.current_user = user;
        $localStorage.logged_in    = true;

        $rootScope.$emit('firebase.logged_in');
      }
    });
  };

  return {
    login: login,
    logout: logout,
    register: register
  }
});