RealCV/src/RealCV.Infrastructure/Services/UserContextService.cs

using System.Security.Claims;
using Microsoft.AspNetCore.Components.Authorization;
using RealCV.Application.Interfaces;

namespace RealCV.Infrastructure.Services;

public sealed class UserContextService : IUserContextService
{
    private readonly AuthenticationStateProvider _authenticationStateProvider;

    public UserContextService(AuthenticationStateProvider authenticationStateProvider)
    {
        _authenticationStateProvider = authenticationStateProvider;
    }

    public async Task<Guid?> GetCurrentUserIdAsync()
    {
        var authState = await _authenticationStateProvider.GetAuthenticationStateAsync();
        var userIdClaim = authState.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;

        if (string.IsNullOrEmpty(userIdClaim) || !Guid.TryParse(userIdClaim, out var userId))
        {
            return null;
        }

        return userId;
    }
}