IfMatch           = "If-Match"
	IfNoneMatch       = "If-None-Match"

	// Request tags used in GetObjectAttributes
	Checksum     = "Checksum"
	StorageClass = "StorageClass"
	ObjectSize   = "ObjectSize"
	ObjectParts  = "ObjectParts"

	// S3 storage class
	AmzStorageClass = "x-amz-storage-class"

	// S3 object version ID
	AmzVersionID    = "x-amz-version-id"
	AmzDeleteMarker = "x-amz-delete-marker"

	// S3 object tagging

	g := errgroup.WithNErrs(len(onlineDisks))

	objectParts := make([][]string, len(onlineDisks))
	// List uploaded parts from drives.
	for index := range onlineDisks {
		g.Go(func() (err error) {
			if onlineDisks[index] == nil {
				return errDiskNotFound
			}
			objectParts[index], err = onlineDisks[index].ListDir(ctx, minioMetaMultipartBucket, minioMetaMultipartBucket, partPath, -1)

	ChecksumAlgo string
	ChecksumType string
}

type getObjectAttributesResponse struct {
	ETag         string                    `xml:",omitempty"`
	Checksum     *objectAttributesChecksum `xml:",omitempty"`
	ObjectParts  *objectAttributesParts    `xml:",omitempty"`
	StorageClass string                    `xml:",omitempty"`
	ObjectSize   int64                     `xml:",omitempty"`
}

type objectAttributesChecksum struct {

		return opts, valid
	}

	for tag := range opts.ObjectAttributes {
		switch tag {
		case xhttp.ETag:
		case xhttp.Checksum:
		case xhttp.StorageClass:
		case xhttp.ObjectSize:
		case xhttp.ObjectParts:
		default:
			apiErr = errorCodes.ToAPIErr(ErrInvalidAttributeName)
			argumentName = strings.ToLower(xhttp.AmzObjectAttributes)
			argumentValue = tag
			valid = false
			return opts, valid
		}
	}