public static IFileCabinetConfigConverterFactory RegisterAmazonS3ConfigConverter(this IFileCabinetConfigConverterFactory factory) {
     var credentialsFactory = new AWSCredentialsFactory();
     factory.RegisterProvider(AmazonS3CabinetConfig.ProviderType, new AmazonS3ConfigConverter(credentialsFactory));
     return factory;
 }
 public AWSCredentialsFactoryFacts() {
     this.factory = new AWSCredentialsFactory();
 }