Configurable Custom authenticator and mandatory parameters

[Francesco Corbetta]

Hello

I'm implementing a custom authenticator that must be configurable in
the Authentication Flow setting page.
I'd like to set some parameters as mandatory and if I read the code
exactly this is not currently possible, I can only check their values
during the authentication process.
Therefore the end user will suffer a misconfiguration while it would
be better, for instance, to forbid enabling the authenticator if it is
not properly configured.

Am I wrong?

Thanks!