loopbackauth.js

module
  .factory('LoopBackAuth', function() {
    var props = ['accessTokenId', 'currentUserId', 'currentUserData', 'rememberMe'];
    var propsPrefix = '$LoopBack$';

    function LoopBackAuth() {
      var self = this;
      this.rememberMe = undefined;
      this.currentUserData = null;
      props.forEach(function(name) {
        self[name] = load(name);
      });
    }

    LoopBackAuth.prototype.save = function() {
      var self = this;
      var storage = this.rememberMe ? localStorage : sessionStorage;
      props.forEach(function(name) {
        save(storage, name, self[name]);
      });
    };

    LoopBackAuth.prototype.setUser = function(accessTokenId, userId, userData, rememberMe) {
      this.accessTokenId = accessTokenId;
      this.currentUserId = userId;
      this.currentUserData = userData;
      this.rememberMe = rememberMe;
    }

    LoopBackAuth.prototype.clearUser = function() {
      this.accessTokenId = null;
      this.currentUserId = null;
      this.currentUserData = null;
    }

    LoopBackAuth.prototype.clearStorage = function() {
      props.forEach(function(name) {
        save(sessionStorage, name, null);
        save(localStorage, name, null);
      });
    };

    return new LoopBackAuth();

    // Note: LocalStorage converts the value to string
    // We are using empty string as a marker for null/undefined values.
    function save(storage, name, value) {
      var key = propsPrefix + name;
      if (value == null) value = '';
      storage[key] = angular.toJson(value);
    }

    function load(name) {
      var key = propsPrefix + name;
      return angular.fromJson(localStorage[key] || sessionStorage[key] || null);
    }
  })