fetchAndPersistPublicKey method

Implementation

Future<JWK?> fetchAndPersistPublicKey() async {
  try {
    final key = await fetchPublicKey();
    if (key == null) return null;
    await persistPublicKey(key);
    return key;
  } catch (e) {
    _core.logger.e('[$runtimeType] fetch and persist public key error, $e');
  }
  return null;
}