String getUserId()

in src/main/java/org/apache/sling/auth/form/impl/FormAuthenticationHandler.java [678:686]


    String getUserId(final String authData) {
        if (authData != null) {
            String[] parts = TokenStore.split(authData);
            if (parts.length == 3) {
                return parts[2];
            }
        }
        return null;
    }