Services, service registration and dependency injection for auth

dotnet/AipsCore/Infrastructure/Persistence/Authentication/HttpUserContext.cs

@@ -0,0 +1,35 @@
+using System.Security.Claims;
+using AipsCore.Application.Abstract.UserContext;
+using AipsCore.Domain.Models.User.ValueObjects;
+using Microsoft.AspNetCore.Http;
+
+namespace AipsCore.Infrastructure.Persistence.Authentication;
+
+public class HttpUserContext : IUserContext
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+    
+    public HttpUserContext(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor;
+    }
+    
+    public UserId GetCurrentUserId()
+    {
+        var user = _httpContextAccessor.HttpContext?.User;
+        
+        if (user is null || !user.Identity!.IsAuthenticated)
+        {
+            throw new UnauthorizedAccessException("User is not authenticated");
+        }
+        
+        var userIdClaim = user.FindFirst(ClaimTypes.NameIdentifier);
+
+        if (userIdClaim is null)
+        {
+            throw new UnauthorizedAccessException("User id claim not found");
+        }
+        
+        return new UserId(userIdClaim.Value);
+    }
+}