Spring Security Add claim path delimiter configuration for JwtGrantedAuthoritiesConverter

Expected Behavior JwtGrantedAuthoritiesConverter should provide an ability to access authorities as nested claim. As well as it should be included into OAuth2ResourceServerJwtConfiguration.JwtConverterConfiguration.

private Collection<String> getAuthorities(Jwt jwt) {
    String claimName = getAuthoritiesClaimName(jwt);
    ...
    Object authorities = getClaim(jwt, claimName);
    ...
}


private static Object getClaim(Jwt jwt, String claimName) {
    if (this.authoritiesClaimNamePathDelimiter != null) {
        String[] path = claimName.split(this.authoritiesClaimNamePathDelimiter);
        if (path.length > 1) {
            return getNestedClaim(jwt.getClaims(), path);
        }
    }
    return jwt.getClaim(claimName);
}

private static Object getNestedClaim(Map<String, Object> map, String[] path) {
    Object current = map;
    for (String key : path) {
        if (current instanceof Map) {
            current = map.get(key);
        } else {
            return null;
        }
    }
    return current;
}

Current Behavior Does not provide ability to access nested claims.

private Collection<String> getAuthorities(Jwt jwt) {
    String claimName = getAuthoritiesClaimName(jwt);
    ...
    Object authorities = jwt.getClaim(claimName);
    ...
}

Context What are you trying to accomplish? I want to have an ability to access authorities stored in the custom property:

{
  "realm_access": {
    "roles": [
      "admin",
      "manager",
      "user"
    ]
  }
}

What other alternatives have you considered? Are you aware of any workarounds? Obviously, I can create a custom converter or store claims in the root level of jwt. However, I find it useful to have it included into the framework.