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AMREZ.EOP.Infrastructures/Tenancy/DefaultTenantResolver.cs

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+using System.Text.RegularExpressions;
+using AMREZ.EOP.Abstractions.Applications.Tenancy;
+using AMREZ.EOP.Contracts.DTOs.Authentications.Login;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+
+namespace AMREZ.EOP.Infrastructures.Tenancy;
+
+public sealed class DefaultTenantResolver : ITenantResolver
+{
+    private readonly TenantMap _map;
+    private readonly ILogger<DefaultTenantResolver>? _log;
+
+    // แพลตฟอร์มสลัก (ปรับตามระบบจริงได้) — ใช้ "public" เป็นค่าเริ่ม
+    private const string PlatformSlug = "public";
+
+    public DefaultTenantResolver(
+        TenantMap map,
+        ILogger<DefaultTenantResolver>? log = null
+    )
+    {
+        _map = map;
+        _log = log;
+    }
+
+    public ITenantContext? Resolve(HttpContext http, object? hint = null)
+    {
+        var cid = http.TraceIdentifier;
+        var path = http.Request.Path.Value ?? string.Empty;
+
+        // ✅ ทางลัด: ขอ platform ตรง ๆ ด้วย hint
+        if (hint is string hs && string.Equals(hs, "@platform", StringComparison.OrdinalIgnoreCase))
+        {
+            if (_map.TryGetBySlug(PlatformSlug, out var platform))
+            {
+                _log?.LogInformation("Resolved by hint=@platform -> {Slug} cid={Cid}", PlatformSlug, cid);
+                return platform;
+            }
+            _log?.LogWarning("Platform slug '{Slug}' not found in TenantMap cid={Cid}", PlatformSlug, cid);
+            return null;
+        }
+
+        if (path.StartsWith("/api/Tenancy", StringComparison.OrdinalIgnoreCase))
+        {
+            if (_map.TryGetBySlug(PlatformSlug, out var platform))
+            {
+                // เก็บ target tenant แยกไว้ให้ repo/usecase ใช้
+                var headerTenant = http.Request.Headers["X-Tenant"].ToString();
+                if (!string.IsNullOrWhiteSpace(headerTenant))
+                    http.Items["TargetTenantKey"] = headerTenant.Trim().ToLowerInvariant();
+
+                _log?.LogInformation("Resolved CONTROL-PLANE -> platform:{Slug} (path={Path}) cid={Cid}", PlatformSlug, path, cid);
+                return platform;
+            }
+            _log?.LogWarning("CONTROL-PLANE path but platform slug '{Slug}' missing cid={Cid}", PlatformSlug, cid);
+            return null;
+        }
+
+        var header = http.Request.Headers["X-Tenant"].ToString();
+        if (!string.IsNullOrWhiteSpace(header) && _map.TryGetBySlug(header, out var byHeader))
+        {
+            _log?.LogInformation("Resolved by header: {Tenant} cid={Cid}", header, cid);
+            return byHeader;
+        }
+
+        var host = http.Request.Host.Host;
+        if (_map.TryGetByDomain(host, out var byDomain))
+        {
+            _log?.LogInformation("Resolved by domain: {Host} -> {TenantId} cid={Cid}", host, byDomain.Id, cid);
+            return byDomain;
+        }
+
+        var sub = GetSubdomain(host);
+        if (sub != null && _map.TryGetBySlug(sub, out var bySub))
+        {
+            _log?.LogInformation("Resolved by subdomain: {Sub} cid={Cid}", sub, cid);
+            return bySub;
+        }
+
+        if (hint is LoginRequest body && !string.IsNullOrWhiteSpace(body.Tenant) &&
+            _map.TryGetBySlug(body.Tenant!, out var byBody))
+        {
+            _log?.LogInformation("Resolved by body: {Tenant} cid={Cid}", body.Tenant, cid);
+            return byBody;
+        }
+
+        _log?.LogWarning("Resolve FAILED host={Host} header={Header} cid={Cid}",
+            host, string.IsNullOrWhiteSpace(header) ? "<empty>" : header, cid);
+        return null;
+    }
+
+    private static string? GetSubdomain(string host)
+    {
+        if (Regex.IsMatch(host, @"^\d{1,3}(\.\d{1,3}){3}$")) return null; // IP
+        var parts = host.Split('.', StringSplitOptions.RemoveEmptyEntries);
+        return parts.Length >= 3 ? parts[0] : null;
+    }
+}