authentication manager that handles everything related to client authgentication

auth_manager.js

App.AuthManager = Ember.Object.extend({
  init: function() {
    this._super();
    var authToken     = $.cookie('auth_token');
    var authAccountId = $.cookie('auth_account');
    if (!Ember.isEmpty(authToken) && !Ember.isEmpty(authAccountId)) {
      this.authenticate(authToken, authAccountId);
    }
  },

  isAuthenticated: function() {
    return !Ember.isEmpty(this.get('session.authToken')) && !Ember.isEmpty(this.get('session.account'));
  },

  authenticate: function(authToken, accountId) {
    var account = App.Account.find(accountId);
    this.set('session', App.Session.createRecord({
      authToken: authToken,
      account:   account
    }));
  },

  reset: function() {
    this.set('session', null);
  },

  sessionObserver: function() {
    App.Store.authToken = this.get('session.authToken');
    if (Ember.isEmpty(this.get('session'))) {
      $.removeCookie('auth_token');
      $.removeCookie('auth_account');
    } else {
      $.cookie('auth_token', this.get('session.authToken'));
      $.cookie('auth_account', this.get('session.account.id'));
    }
  }.observes('session')
});