Implement SSO (or whole) authentication using a Full-stack Signal

[cromoteca]

Describe your motivation

SSO is handled by Spring and providers can send back-channel logout messages. This has been handled using Push in Hilla in the past. I see that as a perfect candidate for a type-safe full-stack signal which holds nullable user information.

Clients can then subscribe to that signal to know when a user is logged in or out of the session, and in case get the user information as signal value.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

This should also concern Flow, once full-stack signals will support both Flow and Hilla.

[platosha]

Let's work on this after the full-stack signals are available for both Flow and Hilla, so that it could be achieved in a uniform way.