added etag to metadata

internal/s3/minio.go

@@ -65,5 +65,6 @@ func (m *minioClient) GetObjectMetadata(ctx context.Context, key string) (*types
 	return &types.Metadata{
 		Size:        object.Size,
 		ContentType: object.ContentType,
+		ETag:        object.ETag,
 	}, nil
 }

internal/types/types.go

@@ -18,4 +18,5 @@ type Metadata struct {
 	Size        int64
 	ContentType string
 	Filename    string
+	ETag        string
 }

internal/web/web.go

@@ -130,6 +130,9 @@ func getShareHead(client client.Client, w http.ResponseWriter, r *http.Request)
 	w.Header().Set("Content-Type", metadata.ContentType)
 	w.Header().Set("Content-Length", strconv.FormatInt(metadata.Size, 10))
 	w.Header().Set("Content-Disposition", "attachment; filename=\""+metadata.Filename+"\"")
+	if metadata.ETag != "" {
+		w.Header().Set("ETag", metadata.ETag)
+	}
 
 	return share
 }