feat: finalize core modules and gateway

src/Core/TakeoutSaaS.Shared.Web/Security/HttpContextCurrentUserAccessor.cs

@@ -0,0 +1,42 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using TakeoutSaaS.Shared.Abstractions.Security;
+
+namespace TakeoutSaaS.Shared.Web.Security;
+
+/// <summary>
+/// 基于 HttpContext 的当前用户访问器。
+/// </summary>
+public sealed class HttpContextCurrentUserAccessor : ICurrentUserAccessor
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+
+    /// <summary>
+    /// 初始化访问器。
+    /// </summary>
+    public HttpContextCurrentUserAccessor(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor;
+    }
+
+    /// <inheritdoc />
+    public Guid UserId
+    {
+        get
+        {
+            var principal = _httpContextAccessor.HttpContext?.User;
+            if (principal == null || !principal.Identity?.IsAuthenticated == true)
+            {
+                return Guid.Empty;
+            }
+
+            var identifier = principal.FindFirstValue(ClaimTypes.NameIdentifier)
+                             ?? principal.FindFirstValue("sub");
+
+            return Guid.TryParse(identifier, out var id) ? id : Guid.Empty;
+        }
+    }
+
+    /// <inheritdoc />
+    public bool IsAuthenticated => UserId != Guid.Empty;
+}