Spring Security Missing support for private_key_jwt in WebClientReactiveClientCredentialsTokenResponseClient

Describe the bug I'm trying to set up an OAuth2 client against okta with private_key_jwt authentication and client_credentials flow, in Reactive context (not Servlet). But when I try to use a NimbusJwtClientAuthenticationParametersConverter<>(jwkResolver) with a private key I cannot add the converter to WebClientReactiveClientCredentialsTokenResponseClient.

The converter is appliable only to DefaultClientCredentialsTokenResponseClient, while WebClientReactiveClientCredentialsTokenResponseClient lacks of support for private_key_jwt.

To Reproduce OAuth2ClientCredentialsGrantRequestEntityConverter requestEntityConverter = new OAuth2ClientCredentialsGrantRequestEntityConverter(); requestEntityConverter.addParametersConverter(new NimbusJwtClientAuthenticationParametersConverter<>(jwkResolver));

// DefaultClientCredentialsTokenResponseClient clientCredentialsTokenResponseClient = new DefaultClientCredentialsTokenResponseClient(); // clientCredentialsTokenResponseClient.setRequestEntityConverter(requestEntityConverter);

    WebClientReactiveClientCredentialsTokenResponseClient wc = new WebClientReactiveClientCredentialsTokenResponseClient();

// wc.setWebClient(webClient); // questo dovrà essere compatibile con proxy e mtls

    ClientCredentialsReactiveOAuth2AuthorizedClientProvider prov = new ClientCredentialsReactiveOAuth2AuthorizedClientProvider();

    prov.setAccessTokenResponseClient(wc);
    authorizedClientManager.setAuthorizedClientProvider(prov);

    ServerOAuth2AuthorizedClientExchangeFilterFunction oauth = new ServerOAuth2AuthorizedClientExchangeFilterFunction(
            authorizedClientManager);
    oauth.setDefaultClientRegistrationId("buyerbank");

Expected behavior wc.setRequestEntityConverter(requestEntityConverter);

(I think is a bug, not a enhancemente request)

Comment From: jgrandja

@Giambapisasale The reactive support has not been added as of yet. We'll target this enhancement for 5.6.

Closing this in favour of gh-10146

Comment From: Giambapisasale

Thanks for reply.