[keycloak-user] Add dynamically resolved token claim

[Vagelis Savvas]

Hello,
I have an authenticator script and a mapper script and I would like to 
attach a piece of information
during login in the authenticator script then retrieve it in the mapper 
script and set it as a token claim.
(background: this piece of information originates from an extra input 
field of a custom login page and
I want it to appear in the user's access token in order to differentiate 
users based on it).

So, I can't use the user object to attach my info because its not fully 
reliable.
What would work best is to use an object that is unique per 
authentication session and available in both scripts.
The user object is both unique and available but is also a singleton.

Thus I've tried via keycloakSession.setAttribute('myInfo', value) in 
auth script and then keycloakSession.getAttribute('myInfo')
in mapper script  but it doesn't work (why isn't the keycloakSession 
object the same in the two scripts?).
I've also tried in auth script 
authenticationSession.setUserSessionNote('myInfo',value) and then 
userSession.getNote('myInfo')
in mapper script  but it doesn't work as well.
Any further ideas on how to solve this in a reliable way?

Cheers,
Vagelis