Handle non-standard groups claims

[blut]

Hello

Our upstream ID provider offers groups as claim in the ID Token formated as
groups: "|group1|group2|"

Is there a way to offer them to clients in a groups: ["group1","group2"] scope or claim?

Kind regards

[blut]

I've debugged the issue and found that groups are parsed as []interface{}, meaning that string lists are discarded completely.
( https://github.com/dexidp/dex/blob/master/connector/oidc/oidc.go#L325-L343 )

Current workaround is custom parsing:

        if !found {
            groupsClaim := claims[groupsKey]
            groupsStr, ok := groupsClaim.(string)
            if ok {
                for _, v := range strings.Split(groupsStr, "|") {
                    if v == "" {
                        continue
                    }
                    groups = append(groups, v)
                }
            }
        }