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 {

	}

	objInfo.decryptPartsChecksums(r.Header)

	if _, ok := opts.ObjectAttributes[xhttp.ObjectParts]; ok {
		OA.ObjectParts = new(objectAttributesParts)
		OA.ObjectParts.PartNumberMarker = opts.PartNumberMarker

		OA.ObjectParts.MaxParts = opts.MaxParts
		partsLength := len(objInfo.Parts)
		OA.ObjectParts.PartsCount = partsLength

		if opts.MaxParts > -1 {
			for i, v := range objInfo.Parts {