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Foxchat.Core/Federation/RequestSigningService.Client.cs

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+using System.Net.Http.Headers;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Foxchat.Core.Federation;
+
+public partial class RequestSigningService
+{
+    public const string USER_AGENT_HEADER = "User-Agent";
+    public const string USER_AGENT = "Foxchat.NET";
+    public const string DATE_HEADER = "Date";
+    public const string CONTENT_LENGTH_HEADER = "Content-Length";
+    public const string CONTENT_TYPE_HEADER = "Content-Type";
+    public const string CONTENT_TYPE = "application/json; charset=utf-8";
+
+    public const string SERVER_HEADER = "X-Foxchat-Server";
+    public const string SIGNATURE_HEADER = "X-Foxchat-Signature";
+    public const string USER_HEADER = "X-Foxchat-User";
+
+    private static readonly JsonSerializerSettings _jsonSerializerSettings = new()
+    {
+        ContractResolver = new DefaultContractResolver
+        {
+            NamingStrategy = new SnakeCaseNamingStrategy()
+        }
+    };
+
+    public async Task<T> RequestAsync<T>(HttpMethod method, string domain, string requestPath, string? userId = null, object? body = null)
+    {
+        var request = BuildHttpRequest(method, domain, requestPath, userId, body);
+        _logger.Debug("Content length in header: '{ContentLength}'", request.Headers.Where(c => c.Key == "Content-Length"));
+        var resp = await _httpClient.SendAsync(request);
+        if (!resp.IsSuccessStatusCode)
+        {
+            var error = await resp.Content.ReadAsStringAsync();
+            _logger.Error("Received {Status}, body: {Error}", resp.StatusCode, error);
+            // TODO: replace this with specific exception type
+            throw new Exception("oh no a request error");
+        }
+
+        var bodyString = await resp.Content.ReadAsStringAsync();
+        // TODO: replace this with specific exception type
+        return DeserializeObject<T>(bodyString) ?? throw new Exception("oh no invalid json");
+    }
+
+    private HttpRequestMessage BuildHttpRequest(HttpMethod method, string domain, string requestPath, string? userId = null, object? bodyData = null)
+    {
+        var body = bodyData != null ? SerializeObject(bodyData) : null;
+
+        var now = _clock.GetCurrentInstant();
+        var url = $"https://{domain}{requestPath}";
+        var signature = GenerateSignature(new SignatureData(now, domain, requestPath, body?.Length, userId));
+
+        var request = new HttpRequestMessage(method, url);
+        request.Headers.Clear();
+        request.Headers.Add(USER_AGENT_HEADER, USER_AGENT);
+        request.Headers.Add(DATE_HEADER, FormatTime(now));
+        request.Headers.Add(SERVER_HEADER, _config.Domain);
+        request.Headers.Add(SIGNATURE_HEADER, signature);
+        if (userId != null)
+            request.Headers.Add(USER_HEADER, userId);
+        if (body != null)
+        {
+            request.Content = new StringContent(body, new MediaTypeHeaderValue("application/json", "utf-8"));
+        }
+
+        return request;
+    }
+
+    public static string SerializeObject(object data) => JsonConvert.SerializeObject(data, _jsonSerializerSettings);
+    public static T? DeserializeObject<T>(string data) => JsonConvert.DeserializeObject<T>(data, _jsonSerializerSettings);
+}