Identity 2.0: Creating custom ClaimsIdentity eg: User.Identity.GetUserById(int id) for Per Request Validation

Question

See this similar question: Need access more user properties in User.Identity

I would like to create custom authentication methods to use with my Razor Views that allo

Answer 1

I actually found the solution using the answer to this SO question by LukeP but as Shoe notes, this is pre-MVC5 and we could simply put in a Claim instead.

I made the following alterations:

    interface IDomainPrincipal : IPrincipal
    {
        int Id { get; set; }
        string UserName { get; set; }
        string AvatarUrl { get; set; }
    }

    public class DomainPrincipal : IDomainPrincipal
    {
        public IIdentity Identity { get; private set; }
        public bool IsInRole(string role) { return false; }

        public DomainPrincipal(string email)
        {
            this.Identity = new GenericIdentity(email);
        }

        public int Id { get; set; }
        public string UserName { get; set; }
        public string AvatarUrl { get; set; }
    }

Then I used @User.Id, @User.UserName, @User.AvatarUrl in my @Razor Views respectively

Answer 2

The IIdentity object in MVC is going to be the issued token that corresponds to the identity of the user. This differs from whatever object or method you use on the back-end that represents the user (say a User class). If you want to use the user's identity to get a custom value then you need to put it into their claims object (ie the identity token) when they sign in (or at some other point in time).

You can add a claim at any time by giving the user an identity.

AuthenticationManager.SignOut(DefaultAuthenticationTypes.ExternalCookie);
var identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
identity.AddClaim(new Claim("PhoneNumber", "123-456-7890"));
AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = isPersistent }, identity);

When you have that claim inserted into their token you can retrieve it using an extension method like this...

public static string GetPhoneNumber(this IIdentity identity)
{
    return ((ClaimsIdentity)identity).FindFirstValue("PhoneNumber");
}

Razor

@using MyProject.Web.Extensions

<img src="@User.Identity.GetPhoneNumber()" />