> (you don't have to strictly follow this form)

**Use case**

Support manually snapshot for Keeper.

**Describe the solution you'd like**

Throught 4lw commands, such as `csnp`.


extern const int NO_ELEMENTS_IN_CONFIG;
    extern const int SUPPORT_IS_DISABLED;
    extern const int LOGICAL_ERROR;
    extern const int INVALID_CONFIG_PARAMETER;
}
namespace
{
#if USE_SSL
void setSSLParams(nuraft::asio_service::options & asio_opts)
{
    const Poco::Util::LayeredConfiguration & config = Poco::Util::Application::instance().config();
    String certificate_file_property = "openSSL.server.certificateFile";
    String private_key_file_property = "openSSL.server.privateKeyFile";
    String root_ca_file_property = "openSSL.server.caConfig";
    if (!config.has(certificate_file_property))
        throw Exception("Server certificate file is not set.", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
    if (!config.has(private_key_file_property))
        throw Exception("Server private key file is not set.", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
    asio_opts.enable_ssl_ = true;
    asio_opts.server_cert_file_ = config.getString(certificate_file_property);
    asio_opts.server_key_file_ = config.getString(private_key_file_property);
    if (config.has(root_ca_file_property))
        asio_opts.root_cert_file_ = config.getString(root_ca_file_property);
    if (config.getBool("openSSL.server.loadDefaultCAFile", false))
        asio_opts.load_default_ca_file_ = true;
    if (config.getString("openSSL.server.verificationMode", "none") == "none")
        asio_opts.skip_verification_ = true;
}
#endif
std::string checkAndGetSuperdigest(const String & user_and_digest)