chore: 初始化项目基础文件

src/Modules/TakeoutSaaS.Module.Tenancy/TenantProvider.cs

@@ -0,0 +1,39 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Module.Tenancy;
+
+/// <summary>
+/// 默认租户提供者：优先从Header: X-Tenant-Id，其次从Token Claim: tenant_id
+/// </summary>
+public sealed class TenantProvider : ITenantProvider
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+
+    public TenantProvider(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor;
+    }
+
+    public Guid GetCurrentTenantId()
+    {
+        var httpContext = _httpContextAccessor.HttpContext;
+        if (httpContext == null) return Guid.Empty;
+
+        // 1. Header 优先
+        if (httpContext.Request.Headers.TryGetValue("X-Tenant-Id", out var values))
+        {
+            if (Guid.TryParse(values.FirstOrDefault(), out var headerTenant))
+                return headerTenant;
+        }
+
+        // 2. Token Claim
+        var claim = httpContext.User?.FindFirst("tenant_id");
+        if (claim != null && Guid.TryParse(claim.Value, out var claimTenant))
+            return claimTenant;
+
+        return Guid.Empty; // 未识别到则返回空（上层可按需处理）
+    }
+}
+