chat: add hello controller

Foxchat.Core/Extensions/HttpContextExtensions.cs

@@ -0,0 +1,38 @@
+using Foxchat.Core.Federation;
+using Microsoft.AspNetCore.Http;
+
+namespace Foxchat.Core.Extensions;
+
+public static class HttpContextExtensions
+{
+    public static bool ExtractRequestData(this HttpContext ctx, out string signature, out string domain, out SignatureData data)
+    {
+        signature = string.Empty;
+        domain = string.Empty;
+        data = SignatureData.Empty;
+
+        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.SIGNATURE_HEADER, out var encodedSignature))
+            return false;
+        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.DATE_HEADER, out var date))
+            return false;
+        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.SERVER_HEADER, out var server))
+            return false;
+        var time = RequestSigningService.ParseTime(date.ToString());
+        string? userId = null;
+        if (ctx.Request.Headers.TryGetValue(RequestSigningService.USER_HEADER, out var userIdHeader))
+            userId = userIdHeader;
+        var host = ctx.Request.Headers.Host.ToString();
+
+        signature = encodedSignature.ToString();
+        domain = server.ToString();
+        data = new SignatureData(
+            time,
+            host,
+            ctx.Request.Path,
+            (int?)ctx.Request.Headers.ContentLength,
+            userId
+        );
+
+        return true;
+    }
+}