how to add array to token

[cezarywysocki]

when we send data to mutator hydrator, it looks like this:

{
        "subject": "client8",
        "extra": {
            "aud": [
                "app1",
                "app2"
            ],
            "client_id": "client8",
            "exp": 1614849086,
            "ext": {},
            "iat": 1614762686,
            "iss": "http://ory-hydra.namespace.svc.cluster.local/",
            "jti": "xyz,
            "nbf": 1614762686,
            "scp": [
                "id1",
                "id2",
                "id3"
            ],
            "sub": "client8"
        }
[CUT]
}

next we send it to next mutator id_token:

{
        "handler": "id_token",
        "config": {
          "claims": "{\"aud\": \"{{ print .Extra.aud }}\", \"scope\": \"{{ print .Extra.scp }}\"}"
        }
}

but at the end JWT, generated by oathkeeper, looks like:

{
  "aud": "[app1 app2]",
  "exp": 1614784756,
  "iat": 1614783856,
  "iss": "http://localhost:4455/",
  "jti": "xyz",
  "nbf": 1614783856,
  "scope": "[id1 id2 id3 id_added_by_hydrator]",
  "sub": "client8"
}

how can we fix aud and scope to looks like below.
I know that we can referrer to indexes like printIndex .Extra.aud 0 but number of indexes in aud and scope is not fixed and can be different for each client_id.

{
  "aud": "[
      "app1",
      "app2"
   ]",
  "exp": 1614784756,
  "iat": 1614783856,
  "iss": "http://localhost:4455/",
  "jti": "xyz",
  "nbf": 1614783856,
  "scope": "[
      "id1",
      "id2",
      "id3",
      "id_added_by_hydrator"
   ]",
  "sub": "client8"
}

[cezarywysocki]

as i understood from site gjson.dev [1] print .Extra.aud should paste:
["app1", "app2"]
but instead it paste:
[app1 app2]

so, IMO this is a bug in oathkeeper.

[1]

[vinckr]

Thanks for looking into it! 💪
I checked as well and I think you are correct in that it should format it with ,

Could you open an issue describing this?

[cezarywysocki]

done: #654