Ability to restrict the namespaces / workflow to show

I initially send this question on Slack, but here seems to be the right place, asked by Maxim.
Is there a system in the temporal web to restrict the namespaces / workflows to show ? based on the user connected
We use Temporal as a server with multiples customers, and we don’t want to expose clients informations to other customers.

For that, you need to install (via server options) an authorizer that would control access on a per-namespace basis. Have you found this sample yet?

Ok, it sounds great, I need to restrict at the server level.
My only problem now, I’m a JAVA developer not Go. x(