aspnetcore/src/Components/test/testassets/TestServer/Controllers/UserController.cs

using System;
using System.Linq;
using System.Security.Claims;
using BasicTestApp.AuthTest;
using Microsoft.AspNetCore.Mvc;

namespace Components.TestServer.Controllers
{
    [Route("api/[controller]")]
    public class UserController : Controller
    {
        // Servers are not expected to expose everything from the server-side ClaimsPrincipal
        // to the client. It's up to the developer to choose what kind of authentication state
        // data is needed on the client so it can display suitable options in the UI.
        // In this class, we inform the client only about certain roles and certain other claims.
        static string[] ExposedRoles = new[] { "IrrelevantRole", "TestRole" };

        // GET api/user
        [HttpGet]
        public ClientSideAuthenticationStateData Get()
        {
            return new ClientSideAuthenticationStateData
            {
                IsAuthenticated = User.Identity.IsAuthenticated,
                UserName = User.Identity.Name,
                ExposedClaims = User.Claims
                    .Where(c => c.Type == "test-claim" || IsExposedRole(c))
                    .Select(c => (c.Type, c.Value)).ToList()
            };
        }

        private bool IsExposedRole(Claim claim)
            => claim.Type == ClaimTypes.Role
            && ExposedRoles.Contains(claim.Value);
    }
}