code: func (client *GCSBlobstore) getObjectHandle(gcs *storage.Client, src string) *storage.ObjectHandle {
  	handle := gcs.Bucket(client.config.BucketName).Object(src)
  	if client.config.EncryptionKey != nil {
  		handle = handle.Key(client.config.EncryptionKey)
  	}
  	return handle
  }
docs: // getObjectHandle returns a handle to an object named src