Slugify username received from oidc

        username = userinfo.get("preferred_username", userinfo["email"])

        if "@" in username:

            username = username.split("@")[0]  # username created from username portion of email

        username = util.ready_name_for_url(username)

        if trans.sa_session.query(trans.app.model.User).filter_by(username=username).first():

            # if username already exists in database, append integer and iterate until unique username found

            count = 0