Структура, доп модули, федерация, документация

backend/src/Modules/Federation/Infrastructure/Services/FederationGateway.cs

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+using System;
+using System.Net.Http;
+using System.Net.Http.Json;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Knot.Modules.Federation.Application.Abstractions;
+using Knot.Shared.Kernel;
+using Knot.Shared.Kernel.Configuration;
+using Knot.Shared.Kernel.Security;
+
+namespace Knot.Modules.Federation.Infrastructure.Services;
+
+/// <summary>
+/// Реализация шлюза федерации с гибридным шифрованием (AES-RSA).
+/// </summary>
+public sealed class FederationGateway : IFederationGateway
+{
+    private readonly ISettingsService _settingsService;
+    private readonly HttpClient _httpClient;
+
+    public FederationGateway(ISettingsService settingsService, HttpClient httpClient)
+    {
+        _settingsService = settingsService;
+        _httpClient = httpClient;
+    }
+
+    public async Task<Result> SendPacketAsync(FederationMessagePacket packet, string targetDomain, CancellationToken ct = default)
+    {
+        try
+        {
+            var url = $"{targetDomain.TrimEnd('/')}/api/federation/v1/inbound";
+            
+            // 1. Формируем тело запроса
+            var content = JsonContent.Create(packet);
+            
+            // 2. Добавляем подпись в заголовки (как доп. уровень верификации)
+            _httpClient.DefaultRequestHeaders.Remove("X-Knot-Signature");
+            _httpClient.DefaultRequestHeaders.Add("X-Knot-Signature", packet.Signature);
+
+            var response = await _httpClient.PostAsync(url, content, ct);
+
+            if (response.IsSuccessStatusCode)
+            {
+                return Result.Success();
+            }
+
+            var errorMsg = await response.Content.ReadAsStringAsync(ct);
+            return Result.Failure(new Error("Federation.DeliveryFailed", $"Target server returned: {response.StatusCode}. {errorMsg}"));
+        }
+        catch (Exception ex)
+        {
+            return Result.Failure(new Error("Federation.NetworkError", ex.Message));
+        }
+    }
+}