AuthorBuddy/Services/CustomAuthStateProvider.cs

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

namespace AuthorBuddy.Web.Services;

public class CustomAuthStateProvider : AuthenticationStateProvider
{
    private readonly IAuthService _authService;
    private AuthenticationState _anonymous;

    public CustomAuthStateProvider(IAuthService authService)
    {
        _authService = authService;
        _anonymous = new AuthenticationState(new ClaimsPrincipal(new ClaimsIdentity()));
    }

    public override async Task<AuthenticationState> GetAuthenticationStateAsync()
    {
        var user = await _authService.GetCurrentUserAsync();
        if (user != null)
        {
            var claims = new List<Claim>
            {
                new Claim(ClaimTypes.Name, user.Name),
                new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
            };
            foreach (var role in user.Roles)
                claims.Add(new Claim(ClaimTypes.Role, role.ToString()));

            var identity = new ClaimsIdentity(claims, "custom");
            return new AuthenticationState(new ClaimsPrincipal(identity));
        }
        return _anonymous;
    }

    public void NotifyStateChanged()
    {
        NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
    }
}