[keycloak-user] Passing an array of user realm roles in a Token Mapper

[HATHERLY, Adam (NHS DIGITAL)]

Hi,


I have been using the Token Mappers within a Client to map a set of Keycloak Group Memberships into an attribute in the Token, so the client application can grant appropriate access based on this. The groups are coming through as an array in the token, which works nicely.

I wanted to switch to using a "User Realm Role" mapper instead of "Group Memberships" because I can then set up automatic realm roles based on the identity source, which I can't do with Groups.

My problem is, when I create a new User Realm Role mapper in the Client definition, the only types I can specify for the field are String, long, int or boolean. If I choose String, the list of roles comes through as a comma-separated String rather than an array in the JSON object. I'd rather not update all my clients to parse this - is there any way of getting keycloak to return the roles as an array rather than a string? Is this against the spec, or is there some other limitation I am not aware of that prevents this?


Thanks,

Adam.?



Adam Hatherly
Senior Technical Architect
Central Architecture Service
NHS Digital

adam.hatherly at nhs.net<mailto:adam.hatherly at nhs.net>
0113 397 4164
07920 861 737


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