Escl: Replace host in job URIs

Author: cyanfish

NAPS2.Escl/Client/EsclClient.cs

@@ -94,9 +94,18 @@ public async Task<EsclJob> CreateScanJob(EsclScanSettings settings)
         var response = await HttpClient.PostAsync(url, content);
         response.EnsureSuccessStatusCode();
         Logger.LogDebug("POST OK");
+
+        // The job URI might not have our preferred ip/host; in particular, for IPv6 link-local addresses, it won't
+        // include the network interface.
+        var hostAndPort = GetHostAndPort();
+        var uriBuilder = new UriBuilder(response.Headers.Location!)
+        {
+            Host = hostAndPort.Substring(0, hostAndPort.LastIndexOf(":", StringComparison.InvariantCulture))
+        };
+
         return new EsclJob
         {
-            Uri = response.Headers.Location!
+            Uri = uriBuilder.Uri
         };
     }
 
@@ -177,14 +186,19 @@ private async Task<XDocument> DoRequest(string endpoint)
     private string GetUrl(string endpoint)
     {
         var protocol = _service.Tls || _service.Port == 443 ? "https" : "http";
-        var ipAndPort = new IPEndPoint(_service.RemoteEndpoint, _service.Port).ToString();
+        return $"{protocol}://{GetHostAndPort()}/{_service.RootUrl}/{endpoint}";
+    }
+
+    private string GetHostAndPort()
+    {
+        var host = new IPEndPoint(_service.RemoteEndpoint, _service.Port).ToString();
 #if NET6_0_OR_GREATER
         if (OperatingSystem.IsMacOS())
         {
             // Using the mDNS hostname is more reliable on Mac (but doesn't work at all on Windows)
-            ipAndPort = $"{_service.Host}:{_service.Port}";
+            host = $"{_service.Host}:{_service.Port}";
         }
 #endif
-        return $"{protocol}://{ipAndPort}/{_service.RootUrl}/{endpoint}";
+        return host;
     }
 }