[keycloak-dev] Claims parameter support

[Aron Bustya]

Hello!

I need the 'claims parameter' support in keycloak that has been thought
about in this jira ticket and postponed/rejected:
https://issues.jboss.org/browse/KEYCLOAK-3226
The proposed alternatives don't work for me, because I am implementing a
specification that explicitly requests data to be passed this way.
In addition to the JIRA above we also need to support passing the claims
parameter in the signed request object - not just as a separate query param.

I've solved the problem for our own use case by writing a ProtocolMapper
but some changes were also needed in the keycloak request parser (to
support the parsing of json objects from the request object - not just
strings).

The ProtocolMapper I've written doesn't support the whole claims parameter
feature though - it can only add the default value of the claim to the the
tokens.

I'm now trying to figure out how much of this code could be put back into
keycloak, and what needs to be changed to do so.
My goal would be to use an 'official' keycloak with cutomization only in
Service Providers and configuration.

Current code commit is here:
https://github.com/abustya/keycloak/commit/41fecf57a982ffdb9
6e210d8bd302d23fa7884da

What do you think about the direction of the development, does it make any
sense to put some of it back into keycloak?

Regards,
Áron Bustya