chore: 同步当前开发内容

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

@@ -0,0 +1,28 @@
+using System;
+using System.Security.Claims;
+
+namespace TakeoutSaaS.Shared.Web.Security;
+
+/// <summary>
+/// ClaimsPrincipal 便捷扩展
+/// </summary>
+public static class ClaimsPrincipalExtensions
+{
+    /// <summary>
+    /// 获取当前用户 Id（不存在时返回 Guid.Empty）
+    /// </summary>
+    public static Guid GetUserId(this ClaimsPrincipal? principal)
+    {
+        if (principal == null)
+        {
+            return Guid.Empty;
+        }
+
+        var identifier = principal.FindFirstValue(ClaimTypes.NameIdentifier)
+                         ?? principal.FindFirstValue("sub");
+
+        return Guid.TryParse(identifier, out var userId)
+            ? userId
+            : Guid.Empty;
+    }
+}