openid-connect-session RPLogout does not work without id token

[danielwegener]

Hi there. I have disabled the id_token in my auth configuration (since I do not need it). The spec (https://openid.net/specs/openid-connect-session-1_0.html#RPLogout) suggests to provide an id_token_hint, but it is not mandatory. However, angular-oauth2-oidc does seem to skip the OP logout redirect if no id_token is available (see https://github.com/manfredsteyer/angular-oauth2-oidc/blob/master/projects/lib/src/oauth-service.ts#L1701).
I wonder if we could remove this if-condition and simply omit the id_token_hint.

[manfredsteyer]

Good idea. I would say, when there is a postLogoutRedirectUri, we redirect to it regardless whether there is an id_token or not. Will be part of the next release.