private void init() {
if(auth == null) {
String authorizationToken = conf.getAuthorizationToken();
String secretKey = conf.getSecretKey();
if (!StringUtils.isEmpty(authorizationToken) && !StringUtils.isEmpty(secretKey)) {
this.auth = new DefaultAuthorization(conf);
} else {
this.auth = NullAuthorization.getInstance();
}
}
}