feat: 初始化 BuildingBlocks 仓库

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

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Http;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Shared.Web.Security;
+
+/// <summary>
+/// HttpContext 租户扩展方法。
+/// </summary>
+public static class TenantHttpContextExtensions
+{
+    /// <summary>
+    /// 获取 HttpContext.Items 中缓存的租户上下文。
+    /// </summary>
+    /// <param name="context">当前 HttpContext</param>
+    /// <returns>租户上下文，若不存在则返回 null</returns>
+    public static TenantContext? GetTenantContext(this HttpContext? context)
+    {
+        if (context == null)
+        {
+            return null;
+        }
+
+        if (context.Items.TryGetValue(TenantConstants.HttpContextItemKey, out var value) &&
+            value is TenantContext tenantContext)
+        {
+            return tenantContext;
+        }
+
+        return null;
+    }
+}