OIDC with dynamic custom-params

[Pablo Vidaurri]

I know about adding static custom params for OIDC such as:

cas.authn.pac4j.oidc[0].generic.custom-params.foo=bar

But I want to pass in a dynamic param, like language:

   cas.authn.pac4j.oidc[0].generic.custom-params.lang=zh

   cas.authn.pac4j.oidc[0].generic.custom-params.lang=jp

   cas.authn.pac4j.oidc[0].generic.custom-params.lang=en

etc, depending what the application is displaying.

From logging, i see these two method having access to the static properties:

DelegatedClientAuthenticationRedirectAction->doExecute
DelegatedClientAuthenticationRedirectAction->handleIdentityProviderWithExternalRedirect

but I can't find a straight fwd way to pass in my dynamic attribute. I just need the class with access to the TARGET url of cas/login?TARGET= so that I can inject my param.

Thanks.

-psv