From d02edbd38d5a13e3180c3663538aefc01f616be8 Mon Sep 17 00:00:00 2001
From: LittleSheep <littlesheep.code@hotmail.com>
Date: Tue, 30 Dec 2025 12:48:53 +0800
Subject: [PATCH] :bug: Fix verify signing string failed due to gateway changed
 the host

---
 .../ActivityPub/ActivityPubSignatureService.cs   | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs b/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
index ba27070..db8c722 100644
--- a/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
+++ b/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
@@ -60,7 +60,7 @@ public class ActivityPubSignatureService(
             return false;
         }
         
-        var signingString = BuildSigningString(context, signatureParts);
+        var signingString = BuildIncomingSigningString(context, signatureParts);
         var signature = signatureParts.GetValueOrDefault("signature");
         
         logger.LogInformation("Built signing string for verification. SigningString: {SigningString}, Signature: {Signature}", 
@@ -103,7 +103,7 @@ public class ActivityPubSignatureService(
             actorUri, publisher.Id);
         
         var headersToSign = new[] { RequestTarget, "host", "date", "digest" };
-        var signingString = BuildSigningStringForRequest(request, headersToSign);
+        var signingString = BuildOutgoingSigningString(request, headersToSign);
         
         logger.LogInformation("Signing string for outgoing request: {SigningString}", signingString);
         
@@ -182,7 +182,7 @@ public class ActivityPubSignatureService(
         }
     }
 
-    private Dictionary<string, string>? ParseSignatureHeader(string signatureHeader)
+    private static Dictionary<string, string>? ParseSignatureHeader(string signatureHeader)
     {
         var parts = new Dictionary<string, string>();
         
@@ -200,7 +200,7 @@ public class ActivityPubSignatureService(
         return parts;
     }
 
-    private string BuildSigningString(HttpContext context, Dictionary<string, string> signatureParts)
+    private string BuildIncomingSigningString(HttpContext context, Dictionary<string, string> signatureParts)
     {
         var headers = signatureParts.GetValueOrDefault("headers")?.Split(' ');
         if (headers == null || headers.Length == 0)
@@ -211,7 +211,7 @@ public class ActivityPubSignatureService(
         foreach (var header in headers)
         {
             if (sb.Length > 0)
-                sb.Append("\n");
+                sb.Append('\n');
             
             sb.Append(header.ToLower());
             sb.Append(": ");
@@ -222,6 +222,10 @@ public class ActivityPubSignatureService(
                 var path = context.Request.Path.Value ?? "";
                 sb.Append($"{method} {path}");
             }
+            else if (header == "host")
+            {
+                sb.Append(Domain);
+            }
             else
             {
                 if (context.Request.Headers.TryGetValue(header, out var values))
@@ -234,7 +238,7 @@ public class ActivityPubSignatureService(
         return sb.ToString();
     }
 
-    private string BuildSigningStringForRequest(HttpRequestMessage request, string[] headers)
+    private string BuildOutgoingSigningString(HttpRequestMessage request, string[] headers)
     {
         var sb = new StringBuilder();
         logger.LogInformation("Building signing string for request. Headers to sign: {Headers}",