Angular2 + web API + token based authentication

See more:

authentication

WebAPI

tokens

, +

I am trying to learn Angular2

and I am trying to create a simple blog with authentication.

this here is my add a new post method:

[Authorize]
// POST: api/Post
public PostModel Post([FromBody]PostViewModel model)
{             
    var post = new PostModel
    {
        Body = model.Body,
        Title = model.Title,
        AuthorId = IdentityExtensions.GetUserId(User.Identity),
    };
    var res = blogRepo.AddPost(post);
    return res;                 
}

everything works fine, but

IdentityExtension.GetUserId()

do not return the most current logged in user but the first user since the app started.

basically I am looking for a way to make sure that the current user logs out on the server as well as on the client (the client side is just a simple removal of the localStorage.removeItem("jwt");)

also there is a good chance that what I am doing is totally wrong, but I can't access the ApplicationUserManager in this controller.

What I have tried:

best res so far was:
AuthorId = IdentityExtensions.GetUserId(User.Identity)
also
Request.GetOwinContext().Authentication.SignOut();

this last one basically i tried to make a logout method, but I cant call this method for what ever the reasons