[#478] Don't fetch epoch at object upload

Creation epoch was used for versioning. With
tree service, versioning is done on the NeoFS
side in the tree.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

api/data/info.go

@@ -38,7 +38,6 @@ type (
 		Size        int64
 		ContentType string
 		Created     time.Time
-		CreationEpoch uint64
 		HashSum     string
 		Owner       user.ID
 		Headers     map[string]string

api/layer/object.go

@@ -17,7 +17,6 @@ import (
 	"github.com/nspcc-dev/neofs-s3-gw/api/cache"
 	"github.com/nspcc-dev/neofs-s3-gw/api/data"
 	apiErrors "github.com/nspcc-dev/neofs-s3-gw/api/errors"
-	"github.com/nspcc-dev/neofs-s3-gw/internal/misc"
 	"github.com/nspcc-dev/neofs-sdk-go/client"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"github.com/nspcc-dev/neofs-sdk-go/object"
@@ -183,14 +182,6 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Object
 		return nil, fmt.Errorf("couldn't add new verion to tree service: %w", err)
 	}
 
-	currentEpoch, _, err := n.neoFS.TimeToEpoch(ctx, time.Now().Add(time.Minute))
-	if err != nil {
-		n.log.Warn("couldn't get creation epoch",
-			zap.String("bucket", p.BktInfo.Name),
-			zap.String("object", misc.SanitizeString(p.Object)),
-			zap.Error(err))
-	}
-
 	if p.Lock != nil && (p.Lock.Retention != nil || p.Lock.LegalHold != nil) {
 		objVersion := &ObjectVersion{
 			BktInfo:    p.BktInfo,
@@ -214,7 +205,6 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Object
 		Name:        p.Object,
 		Size:        p.Size,
 		Created:     time.Now(),
-		CreationEpoch: currentEpoch,
 		Headers:     p.Header,
 		ContentType: p.Header[api.ContentType],
 		HashSum:     hex.EncodeToString(hash),

api/layer/util.go

@@ -123,7 +123,6 @@ func objectInfoFromMeta(bkt *data.BucketInfo, meta *object.Object, prefix, delim
 		Bucket:      bkt.Name,
 		Name:        filename,
 		Created:     creation,
-		CreationEpoch: meta.CreationEpoch(),
 		ContentType: mimeType,
 		Headers:     userHeaders,
 		Owner:       *meta.OwnerID(),