Description

Currently, OIDC BackChannelLogoutHandler is a CDI bean which @Observes the Router and iterates over all static tenants and registers tenant specific routes for managing back-channel logout callbacks if required.

It should be recorded instead in OidcRecorder, similar to have it is done in the WebAuthn extension, though I believe we should not deal with prefixes in case of the main router.

Implementation ideas

BackChannelLogoutHandler#setup and BackChannelLogoutHandler#addRoute should be gone and re-implemented in the OIdcRecorder. OidcRecorder iterates over the default and all other static tenants, so hopefully, all what will be needed, is to check if the current static tenant requires a back-channel logout support and if yes, router.post should be done adding BackChannelLogoutHandler.

OidcBuildStep should use a built item representing the main Router to pass RuntimeValue<Router> to OidcRecorder. I'm assuming it is VertxWebRouterBuildItem