oracleobjectstorage: add read only metadata support - Fixes #8705

backend/oracleobjectstorage/oracleobjectstorage.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/ncw/swift/v2"
 	"github.com/oracle/oci-go-sdk/v65/common"
 	"github.com/oracle/oci-go-sdk/v65/objectstorage"
 	"github.com/rclone/rclone/fs"
@@ -33,9 +34,46 @@ func init() {
 		NewFs:       NewFs,
 		CommandHelp: commandHelp,
 		Options:     newOptions(),
+		MetadataInfo: &fs.MetadataInfo{
+			System: systemMetadataInfo,
+			Help:   `User metadata is stored as opc-meta- keys.`,
+		},
 	})
 }
 
+var systemMetadataInfo = map[string]fs.MetadataHelp{
+	"opc-meta-mode": {
+		Help:    "File type and mode",
+		Type:    "octal, unix style",
+		Example: "0100664",
+	},
+	"opc-meta-uid": {
+		Help:    "User ID of owner",
+		Type:    "decimal number",
+		Example: "500",
+	},
+	"opc-meta-gid": {
+		Help:    "Group ID of owner",
+		Type:    "decimal number",
+		Example: "500",
+	},
+	"opc-meta-atime": {
+		Help:    "Time of last access",
+		Type:    "ISO 8601",
+		Example: "2025-06-30T22:27:43-04:00",
+	},
+	"opc-meta-mtime": {
+		Help:    "Time of last modification",
+		Type:    "ISO 8601",
+		Example: "2025-06-30T22:27:43-04:00",
+	},
+	"opc-meta-btime": {
+		Help:    "Time of file birth (creation)",
+		Type:    "ISO 8601",
+		Example: "2025-06-30T22:27:43-04:00",
+	},
+}
+
 // Fs represents a remote object storage server
 type Fs struct {
 	name          string                             // name of this remote
@@ -82,6 +120,7 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
 	}
 	f.setRoot(root)
 	f.features = (&fs.Features{
+		ReadMetadata:      true,
 		ReadMimeType:      true,
 		WriteMimeType:     true,
 		BucketBased:       true,
@@ -688,6 +727,38 @@ func (f *Fs) ListR(ctx context.Context, dir string, callback fs.ListRCallback) (
 	return list.Flush()
 }
 
+// Metadata returns metadata for an object
+//
+// It should return nil if there is no Metadata
+func (o *Object) Metadata(ctx context.Context) (metadata fs.Metadata, err error) {
+	err = o.readMetaData(ctx)
+	if err != nil {
+		return nil, err
+	}
+	metadata = make(fs.Metadata, len(o.meta)+7)
+	for k, v := range o.meta {
+		switch k {
+		case metaMtime:
+			if modTime, err := swift.FloatStringToTime(v); err == nil {
+				metadata["mtime"] = modTime.Format(time.RFC3339Nano)
+			}
+		case metaMD5Hash:
+			// don't write hash metadata
+		default:
+			metadata[k] = v
+		}
+	}
+	if o.mimeType != "" {
+		metadata["content-type"] = o.mimeType
+	}
+
+	if !o.lastModified.IsZero() {
+		metadata["btime"] = o.lastModified.Format(time.RFC3339Nano)
+	}
+
+	return metadata, nil
+}
+
 // Check the interfaces are satisfied
 var (
 	_ fs.Fs              = &Fs{}