DevForce Community Forum : Accessing Principal from VM http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : Community Forum : Accessing Principal from VM Fri, 10 Apr 2026 20:04:34 -700 Sat, 06 Jul 2013 06:21:12 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=4209 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Accessing Principal from VM : Great, thanks Marcel. http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16546#16546 Author: gregweb
Subject: 4209
Posted: 06-Jul-2013 at 6:21am

Great, thanks Marcel.]]> Sat, 06 Jul 2013 06:21:12 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16546#16546 Accessing Principal from VM : Yes, that is the correct way.... http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16545#16545 Author: mgood
Subject: 4209
Posted: 05-Jul-2013 at 9:05pm

Yes, that is the correct way. The principal should always be retrieved from the AuthenticationService. Instead of injecting the AuthenticationService, though, a cleaner approach is to create a UserService from which you can obtain the principal and other authorization stuff. The UserService uses the AuthenticationService to get the principal and for example cast it to the proper type if you use a custom principal. You can see it in TempHire, although TempHire doesn't actually use the UserService anywhere yet, but it shows the idea. The idea of this approach is to cleanly separate authentication from authorization.

The interface looks like this:

    public interface IUserService
    {
        bool IsLoggedIn { get; }

        UserPrincipal CurrentUser { get; }
    }

And the implementation like this. The custom AuthenticationService acts in both capacities, but from the consumption perspective, the two concerns are separated. 

    [Export(typeof(IAuthenticationService))]
    [Export(typeof(IUserService))]
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class TempHireAuthenticationService : AuthenticationService, IUserService
    {
#if FAKESTORE
        public TempHireAuthenticationService()
        {
            Configure(config => config.WithConnectionOptions(ConnectionOptions.Fake.Name));
        }
#endif

        #region IUserService Members

        public UserPrincipal CurrentUser
        {
            get { return Principal as UserPrincipal; }
        }

        #endregion

        protected override void OnLoggedIn()
        {
            base.OnLoggedIn();
            EventFns.Publish(new LoggedInMessage(CurrentUser));
        }

        protected override void OnLoggedOut()
        {
            base.OnLoggedOut();
            EventFns.Publish(new LoggedOutMessage());
        }
    }

]]> Fri, 05 Jul 2013 21:05:57 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16545#16545 Accessing Principal from VM : I am populating Principal.Roles... http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16531#16531 Author: gregweb
Subject: 4209
Posted: 04-Jul-2013 at 2:39pm

I am populating Principal.Roles on the server.

However, it is not clear how to access the Principal on the client. Since Cocktail doesn't allow direct access to the EntityManager, I can't use EntityManager.Principal directly.

The only way I have found so far is to import the AuthenticationService into the viewModel, and then check AuthenticationService.Principal.

Am I doing this correctly?

Greg]]> Thu, 04 Jul 2013 14:39:48 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=4209&PID=16531#16531