code: func getAuthCredentials() (*awsAccess, error) {
  	awsAccessKeyId := os.Getenv(AWS_ACCESS_KEY_ID)
  	if awsAccessKeyId == "" {
  		return nil, fmt.Errorf("could not get AWS access key")
  	}
  	awsSecretKey := os.Getenv(AWS_SECRET_KEY)
  	if awsSecretKey == "" {
  		return nil, fmt.Errorf("could not get AWS secret key")
  	}
  	return &awsAccess{
  		AccessKey: awsAccessKeyId,
  		SecretKey: awsSecretKey,
  	}, nil
  }
docs: // getAuthCredentials retrieves authorization credentials from configuration.
  // TODO(alex): write to/retrieve from disk json file.