apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/service/AccessKeyServiceWithCache.java/AccessKeyServiceWithCache/getAvailableSecrets
class AccessKeyServiceWithCache:  public List<String> getAvailableSecrets(String appId) {
    List<AccessKey> accessKeys = accessKeyCache.get(appId);
    if (CollectionUtils.isEmpty(accessKeys)) {
      return Collections.emptyList();
    }

    return accessKeys.stream()
        .filter(AccessKey::isEnabled)
        .map(AccessKey::getSecret)
        .collect(Collectors.toList());
  }