SeemGen/Services/CustomAuthenticationProvider.cs

using Microsoft.AspNetCore.Components.Authorization;
using System.Security.Claims;
using System.Threading.Tasks;

namespace BLAIzor.Services
{
    public class CustomAuthenticationStateProvider : AuthenticationStateProvider
    {
        private readonly IHttpContextAccessor _httpContextAccessor;

        public CustomAuthenticationStateProvider(IHttpContextAccessor httpContextAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
        }

        public override Task<AuthenticationState> GetAuthenticationStateAsync()
        {
            var user = _httpContextAccessor.HttpContext?.User;

            if (user == null || !user.Identity.IsAuthenticated)
            {
                var anonymous = new ClaimsPrincipal(new ClaimsIdentity());
                return Task.FromResult(new AuthenticationState(anonymous));
            }

            return Task.FromResult(new AuthenticationState(user));
        }

        public string GetUserId()
        {
            var user = _httpContextAccessor.HttpContext?.User;
            return user?.FindFirst(ClaimTypes.NameIdentifier)?.Value;
        }

        public string GetUserName()
        {
            var user = _httpContextAccessor.HttpContext?.User;
            return user?.Identity?.Name;
        }
    }
}