Show 'claims_supported' in discovery document

[cicnavi]

Find a way to show which claims are supported by OP using 'claims_supported' property in discovery document as per https://openid.net/specs/openid-connect-discovery-1_0.html

[cicnavi]

Keys from 'claim to attribute translate table' from module config file could be used, however, claim names can have type designations at the beginning...

[pradtke]

I think (even without dealing with the type issue) you would need to get the claims from ClaimTranslatorExtractor since ClaimTranslatorExtractorFactory does all the custom scope/claim prefixing when it builds ClaimTranslatorExtractor (though I've never used the claim prefixing feature, so I easily could be wrong)

Then maybe something like this to remove the types

$claims = [];
foreach ($this->translationTable as $claimWithType) {
            list($type, $claim) = $this->getTypeAndClaimName($claimWithType);
            $claims[] = $claim;
}

Overall I agree with your point in #138 that maybe a different syntax for indicating type would make the code and data structures easier.

[cicnavi]

Great, thanks for sharing this option!

[cicnavi]

Note to self that OpenID Federation certification tests show warning for this, as this is the recommended feature to implement by the OpenID Discovery spec:

claims_supported
RECOMMENDED. JSON array containing a list of the Claim Names of the Claims that the OpenID Provider MAY be able to supply values for. Note that for privacy or other reasons, this might not be an exhaustive list