[#11] Add leading slash to FilePath attr

Signed-off-by: Aleksey Kravchenko <al.kravchenko@yadro.com>

backend/frostfs/frostfs.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"io"
 	"math"
@@ -155,6 +156,8 @@ func init() {
 	})
 }
 
+var errMalformedObject = errors.New("malformed object")
+
 // Options defines the configuration for this backend
 type Options struct {
 	FrostfsEndpoint              string      `config:"endpoint"`
@@ -292,7 +295,7 @@ func NewFs(ctx context.Context, name string, root string, m configmap.Mapper) (f
 	return f, nil
 }
 
-func newObject(f *Fs, obj object.Object, container string) *Object {
+func newObject(f *Fs, obj object.Object, container string) (*Object, error) {
 	// we should not include rootDirectory into remote name
 	prefix := f.rootDirectory
 	if prefix != "" {
@@ -326,9 +329,12 @@ func newObject(f *Fs, obj object.Object, container string) *Object {
 		}
 	}
 
-	if objInfo.filePath == "" {
+	// We expect that the FilePath attribute is present in the object and that it starts with a leading slash
-		objInfo.filePath = objInfo.name
+	if objInfo.filePath == "" || objInfo.filePath[0] != '/' {
+		return nil, errMalformedObject
 	}
+	// Don't include a leading slash in the resulting object's file path.
+	objInfo.filePath = objInfo.filePath[1:]
 
 	objInfo.remote = objInfo.filePath
 	if strings.Contains(objInfo.remote, prefix) {
@@ -339,7 +345,7 @@ func newObject(f *Fs, obj object.Object, container string) *Object {
 		}
 	}
 
-	return objInfo
+	return objInfo, nil
 }
 
 // MimeType of an Object if known, "" otherwise
@@ -631,7 +637,7 @@ func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options .
 		_ = f.pool.DeleteObject(ctx, prmDelete)
 	}
 
-	return newObject(f, obj, ""), nil
+	return newObject(f, obj, "")
 }
 
 func fillHeaders(ctx context.Context, filePath string, src fs.ObjectInfo, options ...fs.OpenOption) map[string]string {
@@ -642,7 +648,7 @@ func fillHeaders(ctx context.Context, filePath string, src fs.ObjectInfo, option
 		})
 	}
 
-	headers := map[string]string{object.AttributeFilePath: filePath}
+	headers := map[string]string{object.AttributeFilePath: "/" + filePath}
 
 	for _, option := range options {
 		key, value := option.Header()
@@ -718,8 +724,10 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 	if err != nil {
 		return fmt.Errorf("fetch head object: %w", err)
 	}
-
+	var objInfo *Object
-	objInfo := newObject(o.fs, obj, "")
+	if objInfo, err = newObject(o.fs, obj, ""); err != nil {
+		return err
+	}
 
 	o.filePath = objInfo.filePath
 	o.remote = objInfo.remote
@@ -769,7 +777,7 @@ func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
 		return nil, fmt.Errorf("head object: %w", err)
 	}
 
-	return newObject(f, obj, ""), nil
+	return newObject(f, obj, "")
 }
 
 func (f *Fs) waitForAPECacheInvalidated(ctx context.Context, expectedCh chain.Chain, cnrID cid.ID) error {
@@ -1053,7 +1061,11 @@ func (f *Fs) listEntries(ctx context.Context, rootDirName, containerPath, direct
 			return nil, err
 		}
 
-		objInf := newObject(f, obj, rootDirName)
+		objInf, err := newObject(f, obj, rootDirName)
+		if err != nil {
+			// skip an erroneous object
+			continue
+		}
 
 		if !recursive {
 			withoutPath := strings.TrimPrefix(objInf.filePath, containerPath)
@@ -1112,7 +1124,7 @@ func (f *Fs) listContainers(ctx context.Context) (fs.DirEntries, error) {
 func (f *Fs) findObjectsFilePath(ctx context.Context, cnrID cid.ID, filePath string) ([]oid.ID, error) {
 	return f.findObjects(ctx, cnrID, searchFilter{
 		Header:    object.AttributeFilePath,
-		Value:     filePath,
+		Value:     "/" + filePath,
 		MatchType: object.MatchStringEqual,
 	})
 }
@@ -1120,7 +1132,7 @@ func (f *Fs) findObjectsFilePath(ctx context.Context, cnrID cid.ID, filePath str
 func (f *Fs) findObjectsPrefix(ctx context.Context, cnrID cid.ID, prefix string) ([]oid.ID, error) {
 	return f.findObjects(ctx, cnrID, searchFilter{
 		Header:    object.AttributeFilePath,
-		Value:     prefix,
+		Value:     "/" + prefix,
 		MatchType: object.MatchCommonPrefix,
 	})
 }
@@ -1139,7 +1151,7 @@ func (f *Fs) findObjects(ctx context.Context, cnrID cid.ID, filters ...searchFil
 func (f *Fs) deleteByPrefix(ctx context.Context, cnrID cid.ID, prefix string) error {
 	filters := object.NewSearchFilters()
 	filters.AddRootFilter()
-	filters.AddFilter(object.AttributeFilePath, prefix, object.MatchCommonPrefix)
+	filters.AddFilter(object.AttributeFilePath, "/"+prefix, object.MatchCommonPrefix)
 
 	var prmSearch pool.PrmObjectSearch
 	prmSearch.SetContainerID(cnrID)