adjust dpop

src/WalletFramework.Oid4Vc/Oid4Vci/Authorization/DPop/Abstractions/IDPopHttpClient.cs

@@ -6,6 +6,6 @@ public interface IDPopHttpClient
 {
     internal Task<DPopHttpResponse> Post(
         Uri requestUri,
-        HttpContent content,
-        DPopConfig config);
+        DPopConfig config,
+        Func<HttpContent> getContent);
 }

src/WalletFramework.Oid4Vc/Oid4Vci/Authorization/DPop/Implementations/DPopHttpClient.cs

@@ -31,8 +31,8 @@ public DPopHttpClient(
 
     public async Task<DPopHttpResponse> Post(
         Uri requestUri,
-        HttpContent content,
-        DPopConfig config)
+        DPopConfig config,
+        Func<HttpContent> getContent)
     {
         var dPop = await _keyStore.GenerateDPopProofOfPossessionAsync(
             config.KeyId,
@@ -44,9 +44,7 @@ public async Task<DPopHttpResponse> Post(
             token => _httpClient.WithDPopHeader(dPop).WithAuthorizationHeader(token),
             () => _httpClient.WithDPopHeader(dPop));
 
-        var response = await httpClient.PostAsync(
-            requestUri,
-            content);
+        var response = await httpClient.PostAsync(requestUri, getContent());
 
         await ThrowIfInvalidGrantError(response);
 
@@ -63,7 +61,7 @@ public async Task<DPopHttpResponse> Post(
 
             httpClient.WithDPopHeader(newDpop);
 
-            response = await httpClient.PostAsync(requestUri, content);
+            response = await httpClient.PostAsync(requestUri, getContent());
         }
 
         await ThrowIfInvalidGrantError(response);

src/WalletFramework.Oid4Vc/Oid4Vci/Authorization/Implementations/TokenService.cs

@@ -38,8 +38,8 @@ public async Task<OneOf<OAuthToken, DPopToken>> RequestToken(
 
             var result = await _dPopHttpClient.Post(
                 uri,
-                tokenRequest.ToFormUrlEncoded(),
-                config);
+                config,
+                tokenRequest.ToFormUrlEncoded);
 
             var token = DeserializeObject<OAuthToken>(await result.ResponseMessage.Content.ReadAsStringAsync()) 
                         ?? throw new InvalidOperationException("Failed to deserialize the token response");

src/WalletFramework.Oid4Vc/Oid4Vci/CredRequest/Implementations/CredentialRequestService.cs

@@ -98,7 +98,7 @@ async Task<Validation<CredentialResponse>> ICredentialRequestService.RequestCred
                     clientOptions);
 
                 var result = new MdocCredentialRequest(vciRequest, mdoc);
-                return result.AsJson();
+                return result.EncodeToJson();
             }
         );
 
@@ -121,8 +121,8 @@ async Task<Validation<CredentialResponse>> ICredentialRequestService.RequestCred
 
                 var dPopResponse = await _dPopHttpClient.Post(
                     issuerMetadata.CredentialEndpoint,
-                    content,
-                    config);
+                    config,
+                    () => content);
 
                 return dPopResponse.ResponseMessage;
             });

src/WalletFramework.Oid4Vc/Oid4Vci/CredRequest/Models/Mdoc/MdocCredentialRequest.cs

@@ -24,7 +24,7 @@ public MdocCredentialRequest(CredentialRequest credentialRequest, MdocConfigurat
 
 public static class MdocCredentialRequestFun
 {
-    public static string AsJson(this MdocCredentialRequest request)
+    public static string EncodeToJson(this MdocCredentialRequest request)
     {
         var json = request.VciRequest.EncodeToJson();