A service and several directives based on ng-cloak, which wait for angularFire to finish authenticating--rather than just until Angular bootstraps--before displaying it's content. Handy to get rid of those blips that display when user isn't logged in--oh, wait, now they are.

ngCloakAuth.js

/**
 * This module monitors angularFire's authentication and performs actions based on authentication state.
 *
 * See usage examples here: https://gist.github.com/katowulf/7328023
 */
angular.module('waitForAuth', [])

/**
 * A service that returns a promise object, which is resolved once $firebaseAuth
 * is initialized (i.e. it returns login, logout, or error)
 */
   .service('waitForAuth', function($rootScope, $q, $timeout) {
      var def = $q.defer(), subs = [];
      subs.push($rootScope.$on('$firebaseAuth:login', fn));
      subs.push($rootScope.$on('$firebaseAuth:logout', fn));
      subs.push($rootScope.$on('$firebaseAuth:error', fn));
      function fn(err) {
         if( $rootScope.auth ) {
            $rootScope.auth.error = err instanceof Error? err.toString() : null;
         }
         for(var i=0; i < subs.length; i++) { subs[i](); }
         $timeout(function() {
            // force $scope.$apply to be re-run after login resolves
            def.resolve();
         });
      }
      return def.promise;
   })

/**
 * A directive that hides the element from view until waitForAuth resolves
 */
   .directive('ngCloakAuth', function(waitForAuth) {
      return {
         restrict: 'A',
         compile: function(el) {
            el.addClass('hide');
            waitForAuth.then(function() {
               el.removeClass('hide');
            })
         }
      }
   })

/**
 * A directive that shows elements only when the given authentication state is in effect
 */
   .directive('ngShowAuth', function($rootScope) {
      var loginState;
      $rootScope.$on("$firebaseAuth:login",  function() { loginState = 'login' });
      $rootScope.$on("$firebaseAuth:logout", function() { loginState = 'logout' });
      $rootScope.$on("$firebaseAuth:error",  function() { loginState = 'error' });
      return {
         restrict: 'A',
         compile: function(el, attr) {
            var expState = attr.ngShowAuth;
            function fn(newState) {
               loginState = newState;
               el.toggleClass('hide', loginState !== expState );
            }
            fn(loginState);
            $rootScope.$on("$firebaseAuth:login",  function() { fn('login') });
            $rootScope.$on("$firebaseAuth:logout", function() { fn('logout') });
            $rootScope.$on("$firebaseAuth:error",  function() { fn('error') });
         }
      }
   });

usage.examples.html

<style>
  .hide { display: none; }
</style>

<script>
  // include the waitForAuth module as a dependency
  angular.module('myApp', ['waitForAuth'])
  
  // you can use waitForAuth directly from your scripts
  .controller('myController', function(waitForAuth) {
     waitForAuth.then(function() {
         /* do something after auth completes */
     })
  })
</script>

<!-- and you can use the directives in your views -->
<div ng-cloak-auth>Authentication has resolved.</div>

<div ng-show-auth="login">{{user.id}} is logged in</div>

<div ng-show-auth="logout">Logged out</div>

<div ng-show-auth="error">An error occurred during authentication</div>

Updated for AngularFire 0.6 (releasing this coming week)

Seriously. Killer. Thanks!

Upgraded this to work a bit more reliably. Is also now a drag-and-drop plugin suitable for angularFire, angularFire-seed, and generator-angularfire installs.

Sometimes $firebaseSimpleLogin:logout fires before waitForAuth being registered then that promise is never resolved and ng-show-auth is never showed.

@katowulf do u know what could be the problem?

I solve this calling waitForAuth service into app run()

waitForAuth is 'undefined' when I try calling it from my controller, even though I have included 'simpleLoginTools' as a dependency for my app module.

Any ideas?

Hi, I'm having issues with this module and ui-router. I have view setup like this:

app.config(['$stateProvider',
    function($stateProvider) {
      $stateProvider.state('home', {
        url: '/home',
        views: {
          "main": {
            controller: 'HomeController',
            templateUrl: 'home/home.tpl.html'
          },
          "top-nav": {
            controller: 'HomeController',
            templateUrl: 'home/home-topNav.tpl.html'
          }
        },
        data: {
          pageTitle: 'Home'
        },
        resolve: {
          currentUser: ["simpleLogin",
            function(simpleLogin) {
              // $getCurrentUser returns a promise so the resolve waits for it to complete
              return simpleLogin.getCurrentUser();
            }
          ]

        }
      });
    }
  ]);

My top-nav template looks like this:

<nav class="navbar-default" role="navigation">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand" ui-sref="home">Home</a>
    </div>
    <div class="control-group nav navbar-nav navbar-right">
      <button class="btn btn-default navbar-btn" ng-cloak ng-show-auth="['logout','error']" ui-sref="login">Log In</button>
      <button class="btn btn-default navbar-btn" ng-cloak ng-show-auth="login" ng-controller="LoginController" ng-click="logout()">Log Out</button>
      <button class="btn btn-default navbar-btn" ng-cloak ng-show-auth="login" ng-click="createStory()">Create Story</button>
    </div>
  </div>
</nav>

The problem is that ng-show-auth directives are not working. They resolve to 'logout' state even though the user is logged in. When I remove 'resolve' from my route state config, directives work fine. Can you help please?