jobtrackingapp/JobTrackerApi/Services/CurrentUserService.cs

using System.Security.Claims;

namespace JobTrackerApi.Services;

public interface ICurrentUserService
{
    string? UserId { get; }
}

public sealed class CurrentUserService : ICurrentUserService
{
    private readonly IHttpContextAccessor _http;

    public CurrentUserService(IHttpContextAccessor http)
    {
        _http = http;
    }

    public string? UserId
    {
        get
        {
            var u = _http.HttpContext?.User;
            if (u is null) return null;
            if (u.Identity?.IsAuthenticated != true) return null;
            return u.FindFirstValue(ClaimTypes.NameIdentifier) ?? u.FindFirstValue("sub");
        }
    }
}