return stream(getGroups()).get(stream -> stream.map(this::decode).toArray(n -> new String[n]));
    }

    private String decode(final String value) {
        return new String(Base64.getDecoder().decode(value), Constants.CHARSET_UTF_8);
    }

    @Override
    public String toString() {
        return "User [name=" + name + ", roles=" + Arrays.toString(roles) + ", groups=" + Arrays.toString(groups) + "]";