refactor metadata support

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/common/transfer.go

@@ -500,7 +500,7 @@ func (t *BaseTransfer) getUploadedFiles() int {
 
 func (t *BaseTransfer) updateTimes() {
 	if !t.aTime.IsZero() && !t.mTime.IsZero() {
-		err := t.Fs.Chtimes(t.fsPath, t.aTime, t.mTime, true)
+		err := t.Fs.Chtimes(t.fsPath, t.aTime, t.mTime, false)
 		t.Connection.Log(logger.LevelDebug, "set times for file %q, atime: %v, mtime: %v, err: %v",
 			t.fsPath, t.aTime, t.mTime, err)
 	}

internal/vfs/azblobfs.go

@@ -29,6 +29,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -37,6 +38,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/runtime"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/to"
 	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blob"
 	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blockblob"
 	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/container"
@@ -180,8 +182,11 @@ func (fs *AzureBlobFs) Stat(name string) (os.FileInfo, error) {
 	if err == nil {
 		contentType := util.GetStringFromPointer(attrs.ContentType)
 		isDir := checkDirectoryMarkers(contentType, attrs.Metadata)
-		metric.AZListObjectsCompleted(nil)
-		return NewFileInfo(name, isDir, util.GetIntFromPointer(attrs.ContentLength), util.GetTimeFromPointer(attrs.LastModified), false), nil
+		lastModified := util.GetTimeFromPointer(attrs.LastModified)
+		if val := getAzureLastModified(attrs.Metadata); val > 0 {
+			lastModified = util.GetTimeFromMsecSinceEpoch(val)
+		}
+		return NewFileInfo(name, isDir, util.GetIntFromPointer(attrs.ContentLength), lastModified, false), nil
 	}
 	if !fs.IsNotExist(err) {
 		return nil, err
@@ -377,8 +382,25 @@ func (*AzureBlobFs) Chmod(_ string, _ os.FileMode) error {
 }
 
 // Chtimes changes the access and modification times of the named file.
-func (fs *AzureBlobFs) Chtimes(_ string, _, _ time.Time, _ bool) error {
-	return ErrVfsUnsupported
+func (fs *AzureBlobFs) Chtimes(name string, _, mtime time.Time, isUploading bool) error {
+	if isUploading {
+		return nil
+	}
+	props, err := fs.headObject(name)
+	if err != nil {
+		return err
+	}
+	metadata := props.Metadata
+	if metadata == nil {
+		metadata = make(map[string]*string)
+	}
+	metadata[lastModifiedField] = to.Ptr(strconv.FormatInt(mtime.UnixMilli(), 10))
+
+	ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
+	defer cancelFn()
+
+	_, err = fs.containerClient.NewBlockBlobClient(name).SetMetadata(ctx, metadata, &blob.SetMetadataOptions{})
+	return err
 }
 
 // Truncate changes the size of the named file.
@@ -395,7 +417,7 @@ func (fs *AzureBlobFs) ReadDir(dirname string) (DirLister, error) {
 	prefix := fs.getPrefix(dirname)
 	pager := fs.containerClient.NewListBlobsHierarchyPager("/", &container.ListBlobsHierarchyOptions{
 		Include: container.ListBlobsInclude{
-			//Metadata: true,
+			Metadata: true,
 		},
 		Prefix:     &prefix,
 		MaxResults: &azureBlobDefaultPageSize,
@@ -1089,7 +1111,7 @@ func checkDirectoryMarkers(contentType string, metadata map[string]*string) bool
 	}
 	for k, v := range metadata {
 		if strings.ToLower(k) == azFolderKey {
-			return util.GetStringFromPointer(v) == "true"
+			return strings.ToLower(util.GetStringFromPointer(v)) == "true"
 		}
 	}
 	return false
@@ -1231,6 +1253,9 @@ func (l *azureBlobDirLister) Next(limit int) ([]os.FileInfo, error) {
 				}
 				l.prefixes[name] = true
 			}
+			if val := getAzureLastModified(blobItem.Metadata); val > 0 {
+				modTime = util.GetTimeFromMsecSinceEpoch(val)
+			}
 		}
 		l.cache = append(l.cache, NewFileInfo(name, isDir, size, modTime, false))
 	}

internal/vfs/gcsfs.go

@@ -26,6 +26,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -39,6 +40,7 @@ import (
 
 	"github.com/drakkan/sftpgo/v2/internal/logger"
 	"github.com/drakkan/sftpgo/v2/internal/metric"
+	"github.com/drakkan/sftpgo/v2/internal/util"
 	"github.com/drakkan/sftpgo/v2/internal/version"
 )
 
@@ -47,7 +49,7 @@ const (
 )
 
 var (
-	gcsDefaultFieldsSelection = []string{"Name", "Size", "Deleted", "Updated", "ContentType"}
+	gcsDefaultFieldsSelection = []string{"Name", "Size", "Deleted", "Updated", "ContentType", "Metadata"}
 )
 
 // GCSFs is a Fs implementation for Google Cloud Storage.
@@ -335,8 +337,32 @@ func (*GCSFs) Chmod(_ string, _ os.FileMode) error {
 }
 
 // Chtimes changes the access and modification times of the named file.
-func (fs *GCSFs) Chtimes(_ string, _, _ time.Time, _ bool) error {
-	return ErrVfsUnsupported
+func (fs *GCSFs) Chtimes(name string, _, mtime time.Time, isUploading bool) error {
+	if isUploading {
+		return nil
+	}
+	obj := fs.svc.Bucket(fs.config.Bucket).Object(name)
+	attrs, err := fs.headObject(name)
+	if err != nil {
+		return err
+	}
+	obj = obj.If(storage.Conditions{MetagenerationMatch: attrs.Metageneration})
+
+	ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
+	defer cancelFn()
+
+	metadata := attrs.Metadata
+	if metadata == nil {
+		metadata = make(map[string]string)
+	}
+	metadata[lastModifiedField] = strconv.FormatInt(mtime.UnixMilli(), 10)
+
+	objectAttrsToUpdate := storage.ObjectAttrsToUpdate{
+		Metadata: metadata,
+	}
+	_, err = obj.Update(ctx, objectAttrsToUpdate)
+
+	return err
 }
 
 // Truncate changes the size of the named file.
@@ -615,6 +641,9 @@ func (fs *GCSFs) getObjectStat(name string) (os.FileInfo, error) {
 	if err == nil {
 		objSize := attrs.Size
 		objectModTime := attrs.Updated
+		if val := getLastModified(attrs.Metadata); val > 0 {
+			objectModTime = util.GetTimeFromMsecSinceEpoch(val)
+		}
 		isDir := attrs.ContentType == dirMimeType || strings.HasSuffix(attrs.Name, "/")
 		return NewFileInfo(name, isDir, objSize, objectModTime, false), nil
 	}
@@ -634,7 +663,11 @@ func (fs *GCSFs) getObjectStat(name string) (os.FileInfo, error) {
 	if err != nil {
 		return nil, err
 	}
-	return NewFileInfo(name, true, attrs.Size, attrs.Updated, false), nil
+	objectModTime := attrs.Updated
+	if val := getLastModified(attrs.Metadata); val > 0 {
+		objectModTime = util.GetTimeFromMsecSinceEpoch(val)
+	}
+	return NewFileInfo(name, true, attrs.Size, objectModTime, false), nil
 }
 
 func (fs *GCSFs) setWriterAttrs(objectWriter *storage.Writer, flag int, name string) {
@@ -927,7 +960,11 @@ func (l *gcsDirLister) Next(limit int) ([]os.FileInfo, error) {
 				}
 				l.prefixes[name] = true
 			}
-			l.cache = append(l.cache, NewFileInfo(name, isDir, attrs.Size, attrs.Updated, false))
+			modTime := attrs.Updated
+			if val := getLastModified(attrs.Metadata); val > 0 {
+				modTime = util.GetTimeFromMsecSinceEpoch(val)
+			}
+			l.cache = append(l.cache, NewFileInfo(name, isDir, attrs.Size, modTime, false))
 		}
 	}
 

internal/vfs/vfs.go

@@ -24,6 +24,7 @@ import (
 	"path"
 	"path/filepath"
 	"runtime"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -42,6 +43,7 @@ const (
 	s3fsName          = "S3Fs"
 	gcsfsName         = "GCSFs"
 	azBlobFsName      = "AzureBlobFs"
+	lastModifiedField = "sftpgo_last_modified"
 	preResumeTimeout  = 90 * time.Second
 	// ListerBatchSize defines the default limit for DirLister implementations
 	ListerBatchSize = 1000
@@ -1080,6 +1082,31 @@ func IsUploadResumeSupported(fs Fs, size int64) bool {
 	return fs.IsConditionalUploadResumeSupported(size)
 }
 
+func getLastModified(metadata map[string]string) int64 {
+	if val, ok := metadata[lastModifiedField]; ok {
+		lastModified, err := strconv.ParseInt(val, 10, 64)
+		if err == nil {
+			return lastModified
+		}
+	}
+	return 0
+}
+
+func getAzureLastModified(metadata map[string]*string) int64 {
+	for k, v := range metadata {
+		if strings.ToLower(k) == lastModifiedField {
+			if val := util.GetStringFromPointer(v); val != "" {
+				lastModified, err := strconv.ParseInt(val, 10, 64)
+				if err == nil {
+					return lastModified
+				}
+			}
+			return 0
+		}
+	}
+	return 0
+}
+
 func validateOSFsConfig(config *sdk.OSFsConfig) error {
 	if config.ReadBufferSize < 0 || config.ReadBufferSize > 10 {
 		return fmt.Errorf("invalid read buffer size must be between 0 and 10 MB")