[#195] Implement PUT, GET locks to certain object

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/data/info.go

@@ -104,3 +104,9 @@ func (o *ObjectInfo) Address() *address.Address {
 
 // TagsObject returns name of system object for tags.
 func (o *ObjectInfo) TagsObject() string { return ".tagset." + o.Name + "." + o.Version() }
+
+// LegalHoldObject returns name of system object for lock object.
+func (o *ObjectInfo) LegalHoldObject() string { return ".lock." + o.Name + "." + o.Version() }
+
+// RetentionObject returns name of system object for retention lock object.
+func (o *ObjectInfo) RetentionObject() string { return ".retention." + o.Name + "." + o.Version() }

api/data/locking.go

@@ -1,9 +1,13 @@
 package data
 
-import "time"
+import (
+	"encoding/xml"
+	"time"
+)
 
 type (
 	ObjectLockConfiguration struct {
+		XMLName           xml.Name        `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ObjectLockConfiguration" json:"-"`
 		ObjectLockEnabled string          `xml:"ObjectLockEnabled" json:"ObjectLockEnabled"`
 		Rule              *ObjectLockRule `xml:"Rule" json:"Rule"`
 	}
@@ -18,6 +22,17 @@ type (
 		Years int64  `xml:"Years" json:"Years"`
 	}
 
+	LegalHold struct {
+		XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ LegalHold" json:"-"`
+		Status  string   `xml:"Status" json:"Status"`
+	}
+
+	Retention struct {
+		XMLName         xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ Retention" json:"-"`
+		Mode            string   `xml:"Mode" json:"Mode"`
+		RetainUntilDate string   `xml:"RetainUntilDate" json:"RetainUntilDate"`
+	}
+
 	ObjectLock struct {
 		Until        time.Time
 		LegalHold    bool

api/handler/locking.go

@@ -4,6 +4,7 @@ import (
 	"encoding/xml"
 	"fmt"
 	"net/http"
+	"strconv"
 	"time"
 
 	"github.com/nspcc-dev/neofs-s3-gw/api"
@@ -20,6 +21,7 @@ const (
 	governanceMode = "GOVERNANCE"
 	complianceMode = "COMPLIANCE"
 	legalHoldOn    = "ON"
+	legalHoldOff   = "OFF"
 )
 
 func (h *handler) PutBucketObjectLockConfigHandler(w http.ResponseWriter, r *http.Request) {
@@ -108,6 +110,240 @@ func (h *handler) GetBucketObjectLockConfigHandler(w http.ResponseWriter, r *htt
 	}
 }
 
+func (h *handler) PutObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
+	reqInfo := api.GetReqInfo(r.Context())
+
+	bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
+		return
+	}
+	if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
+		h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
+		return
+	}
+
+	if !bktInfo.ObjectLockEnabled {
+		h.logAndSendError(w, "object lock disabled", reqInfo,
+			apiErrors.GetAPIError(apiErrors.ErrObjectLockConfigurationNotFound))
+		return
+	}
+
+	legalHold := &data.LegalHold{}
+	if err = xml.NewDecoder(r.Body).Decode(legalHold); err != nil {
+		h.logAndSendError(w, "couldn't parse legal hold configuration", reqInfo, err)
+		return
+	}
+
+	if legalHold.Status != legalHoldOn && legalHold.Status != legalHoldOff {
+		h.logAndSendError(w, "invalid legal hold status", reqInfo,
+			fmt.Errorf("invalid status %s", legalHold.Status))
+		return
+	}
+
+	p := &layer.HeadObjectParams{
+		Bucket:    reqInfo.BucketName,
+		Object:    reqInfo.ObjectName,
+		VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
+	}
+
+	objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
+	if err != nil {
+		h.logAndSendError(w, "could not get object info", reqInfo, err)
+		return
+	}
+
+	lockInfo, err := h.obj.HeadSystemObject(r.Context(), bktInfo, objInfo.LegalHoldObject())
+	if err != nil && !apiErrors.IsS3Error(err, apiErrors.ErrNoSuchKey) {
+		h.logAndSendError(w, "couldn't head lock object", reqInfo, err)
+		return
+	}
+
+	if lockInfo == nil && legalHold.Status == legalHoldOff ||
+		lockInfo != nil && legalHold.Status == legalHoldOn {
+		return
+	}
+
+	if lockInfo != nil {
+		if err = h.obj.DeleteSystemObject(r.Context(), bktInfo, objInfo.LegalHoldObject()); err != nil {
+			h.logAndSendError(w, "couldn't delete legal hold", reqInfo, err)
+			return
+		}
+	} else {
+		ps := &layer.PutSystemObjectParams{
+			BktInfo: bktInfo,
+			ObjName: objInfo.LegalHoldObject(),
+			Lock:    &data.ObjectLock{LegalHold: true},
+		}
+		if _, err = h.obj.PutSystemObject(r.Context(), ps); err != nil {
+			h.logAndSendError(w, "couldn't put legal hold", reqInfo, err)
+			return
+		}
+	}
+}
+
+func (h *handler) GetObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
+	reqInfo := api.GetReqInfo(r.Context())
+
+	bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
+		return
+	}
+	if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
+		h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
+		return
+	}
+
+	if !bktInfo.ObjectLockEnabled {
+		h.logAndSendError(w, "object lock disabled", reqInfo,
+			apiErrors.GetAPIError(apiErrors.ErrObjectLockConfigurationNotFound))
+		return
+	}
+
+	p := &layer.HeadObjectParams{
+		Bucket:    reqInfo.BucketName,
+		Object:    reqInfo.ObjectName,
+		VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
+	}
+
+	objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
+	if err != nil {
+		h.logAndSendError(w, "could not get object info", reqInfo, err)
+		return
+	}
+
+	lockInfo, err := h.obj.HeadSystemObject(r.Context(), bktInfo, objInfo.LegalHoldObject())
+	if err != nil && !apiErrors.IsS3Error(err, apiErrors.ErrNoSuchKey) {
+		h.logAndSendError(w, "couldn't head lock object", reqInfo, err)
+		return
+	}
+
+	legalHold := &data.LegalHold{Status: legalHoldOff}
+	if lockInfo != nil {
+		legalHold.Status = legalHoldOn
+	}
+
+	if err = api.EncodeToResponse(w, legalHold); err != nil {
+		h.logAndSendError(w, "something went wrong", reqInfo, err)
+	}
+}
+
+func (h *handler) PutObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
+	reqInfo := api.GetReqInfo(r.Context())
+
+	bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
+		return
+	}
+	if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
+		h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
+		return
+	}
+
+	if !bktInfo.ObjectLockEnabled {
+		h.logAndSendError(w, "object lock disabled", reqInfo,
+			apiErrors.GetAPIError(apiErrors.ErrObjectLockConfigurationNotFound))
+		return
+	}
+
+	retention := &data.Retention{}
+	if err = xml.NewDecoder(r.Body).Decode(retention); err != nil {
+		h.logAndSendError(w, "couldn't parse object retention", reqInfo, err)
+		return
+	}
+
+	lock, err := formObjectLockFromRetention(retention, r.Header)
+	if err != nil {
+		h.logAndSendError(w, "invalid retention configuration", reqInfo, err)
+		return
+	}
+
+	p := &layer.HeadObjectParams{
+		Bucket:    reqInfo.BucketName,
+		Object:    reqInfo.ObjectName,
+		VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
+	}
+
+	objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
+	if err != nil {
+		h.logAndSendError(w, "could not get object info", reqInfo, err)
+		return
+	}
+
+	lockInfo, err := h.obj.HeadSystemObject(r.Context(), bktInfo, objInfo.RetentionObject())
+	if err != nil && !apiErrors.IsS3Error(err, apiErrors.ErrNoSuchKey) {
+		h.logAndSendError(w, "couldn't head lock object", reqInfo, err)
+		return
+	}
+
+	if lockInfo != nil && lockInfo.Headers[layer.AttributeComplianceMode] != "" {
+		h.logAndSendError(w, "couldn't change compliance lock mode", reqInfo, err)
+		return
+	}
+
+	ps := &layer.PutSystemObjectParams{
+		BktInfo: bktInfo,
+		ObjName: objInfo.RetentionObject(),
+		Lock:    lock,
+	}
+	if _, err = h.obj.PutSystemObject(r.Context(), ps); err != nil {
+		h.logAndSendError(w, "couldn't put legal hold", reqInfo, err)
+		return
+	}
+}
+
+func (h *handler) GetObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
+	reqInfo := api.GetReqInfo(r.Context())
+
+	bktInfo, err := h.obj.GetBucketInfo(r.Context(), reqInfo.BucketName)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket info", reqInfo, err)
+		return
+	}
+	if err = checkOwner(bktInfo, r.Header.Get(api.AmzExpectedBucketOwner)); err != nil {
+		h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
+		return
+	}
+
+	if !bktInfo.ObjectLockEnabled {
+		h.logAndSendError(w, "object lock disabled", reqInfo,
+			apiErrors.GetAPIError(apiErrors.ErrObjectLockConfigurationNotFound))
+		return
+	}
+
+	p := &layer.HeadObjectParams{
+		Bucket:    reqInfo.BucketName,
+		Object:    reqInfo.ObjectName,
+		VersionID: reqInfo.URL.Query().Get(api.QueryVersionID),
+	}
+
+	objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
+	if err != nil {
+		h.logAndSendError(w, "could not get object info", reqInfo, err)
+		return
+	}
+
+	lockInfo, err := h.obj.HeadSystemObject(r.Context(), bktInfo, objInfo.RetentionObject())
+	if err != nil {
+		h.logAndSendError(w, "couldn't head lock object", reqInfo, err)
+		return
+	}
+
+	retention := &data.Retention{
+		Mode:            governanceMode,
+		RetainUntilDate: lockInfo.Headers[layer.AttributeRetainUntil],
+	}
+	if lockInfo.Headers[layer.AttributeComplianceMode] != "" {
+		retention.Mode = complianceMode
+	}
+
+	if err = api.EncodeToResponse(w, retention); err != nil {
+		h.logAndSendError(w, "something went wrong", reqInfo, err)
+	}
+}
+
 func checkLockConfiguration(conf *data.ObjectLockConfiguration) error {
 	if conf.ObjectLockEnabled != "" && conf.ObjectLockEnabled != enabledValue {
 		return fmt.Errorf("invalid ObjectLockEnabled value: %s", conf.ObjectLockEnabled)
@@ -180,3 +416,34 @@ func existLockHeaders(header http.Header) bool {
 		header.Get(api.AmzObjectLockLegalHold) != "" ||
 		header.Get(api.AmzObjectLockRetainUntilDate) != ""
 }
+
+func formObjectLockFromRetention(retention *data.Retention, header http.Header) (*data.ObjectLock, error) {
+	var err error
+	var bypassGovernance bool
+	bypass := header.Get(api.AmzBypassGovernanceRetention)
+	if bypass != "" {
+		if bypassGovernance, err = strconv.ParseBool(bypass); err != nil {
+			return nil, fmt.Errorf("couldn't parse '%s' header", api.AmzBypassGovernanceRetention)
+		}
+	}
+
+	if retention.Mode != governanceMode && retention.Mode != complianceMode {
+		return nil, fmt.Errorf("invalid retention mode: %s", retention.Mode)
+	}
+
+	retentionDate, err := time.Parse(time.RFC3339, retention.RetainUntilDate)
+	if err != nil {
+		return nil, fmt.Errorf("couldn't parse retain until date: %s", retention.RetainUntilDate)
+	}
+
+	lock := &data.ObjectLock{
+		Until:        retentionDate,
+		IsCompliance: retention.Mode == complianceMode,
+	}
+
+	if !lock.IsCompliance && !bypassGovernance {
+		return nil, fmt.Errorf("you cannot bypase governance mode")
+	}
+
+	return lock, nil
+}

api/handler/unimplemented.go

@@ -11,22 +11,6 @@ func (h *handler) SelectObjectContentHandler(w http.ResponseWriter, r *http.Requ
 	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
-func (h *handler) GetObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
-}
-
-func (h *handler) GetObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
-}
-
-func (h *handler) PutObjectRetentionHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
-}
-
-func (h *handler) PutObjectLegalHoldHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
-}
-
 func (h *handler) GetBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {
 	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }

api/headers.go

@@ -50,6 +50,7 @@ const (
 	AmzObjectLockLegalHold       = "X-Amz-Object-Lock-Legal-Hold"
 	AmzObjectLockMode            = "X-Amz-Object-Lock-Mode"
 	AmzObjectLockRetainUntilDate = "X-Amz-Object-Lock-Retain-Until-Date"
+	AmzBypassGovernanceRetention = "X-Amz-Bypass-Governance-Retention"
 
 	ContainerID = "X-Container-Id"
 

api/layer/cors.go

@@ -72,7 +72,7 @@ func (n *layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (*d
 }
 
 func (n *layer) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) error {
-	return n.deleteSystemObject(ctx, bktInfo, bktInfo.CORSObjectName())
+	return n.DeleteSystemObject(ctx, bktInfo, bktInfo.CORSObjectName())
 }
 
 func checkCORS(cors *data.CORSConfiguration) error {

api/layer/layer.go

@@ -352,6 +352,7 @@ type (
 		Metadata map[string]string
 		Prefix   string
 		Reader   io.Reader
+		Lock     *data.ObjectLock
 	}
 
 	// ListObjectVersionsParams stores list objects versions parameters.
@@ -398,11 +399,13 @@ type (
 		DeleteBucket(ctx context.Context, p *DeleteBucketParams) error
 
 		GetObject(ctx context.Context, p *GetObjectParams) error
+		HeadSystemObject(ctx context.Context, bktInfo *data.BucketInfo, name string) (*data.ObjectInfo, error)
 		GetObjectInfo(ctx context.Context, p *HeadObjectParams) (*data.ObjectInfo, error)
 		GetObjectTagging(ctx context.Context, p *data.ObjectInfo) (map[string]string, error)
 		GetBucketTagging(ctx context.Context, bucket string) (map[string]string, error)
 
 		PutObject(ctx context.Context, p *PutObjectParams) (*data.ObjectInfo, error)
+		PutSystemObject(ctx context.Context, p *PutSystemObjectParams) (*data.ObjectInfo, error)
 		PutObjectTagging(ctx context.Context, p *PutTaggingParams) error
 		PutBucketTagging(ctx context.Context, bucket string, tagSet map[string]string) error
 
@@ -413,6 +416,7 @@ type (
 		ListObjectVersions(ctx context.Context, p *ListObjectVersionsParams) (*ListObjectVersionsInfo, error)
 
 		DeleteObjects(ctx context.Context, bucket string, objects []*VersionedObject) ([]*VersionedObject, error)
+		DeleteSystemObject(ctx context.Context, bktInfo *data.BucketInfo, name string) error
 		DeleteObjectTagging(ctx context.Context, p *data.ObjectInfo) error
 		DeleteBucketTagging(ctx context.Context, bucket string) error
 
@@ -631,7 +635,7 @@ func (n *layer) GetObjectTagging(ctx context.Context, oi *data.ObjectInfo) (map[
 		Owner: oi.Owner,
 	}
 
-	objInfo, err := n.headSystemObject(ctx, bktInfo, oi.TagsObject())
+	objInfo, err := n.HeadSystemObject(ctx, bktInfo, oi.TagsObject())
 	if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) {
 		return nil, err
 	}
@@ -646,7 +650,7 @@ func (n *layer) GetBucketTagging(ctx context.Context, bucketName string) (map[st
 		return nil, err
 	}
 
-	objInfo, err := n.headSystemObject(ctx, bktInfo, formBucketTagObjectName(bucketName))
+	objInfo, err := n.HeadSystemObject(ctx, bktInfo, formBucketTagObjectName(bucketName))
 	if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) {
 		return nil, err
 	}
@@ -686,11 +690,8 @@ func (n *layer) PutObjectTagging(ctx context.Context, p *PutTaggingParams) error
 		Reader:   nil,
 	}
 
-	if _, err := n.putSystemObject(ctx, s); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := n.PutSystemObject(ctx, s)
+	return err
 }
 
 // PutBucketTagging into storage.
@@ -708,11 +709,8 @@ func (n *layer) PutBucketTagging(ctx context.Context, bucketName string, tagSet
 		Reader:   nil,
 	}
 
-	if _, err = n.putSystemObject(ctx, s); err != nil {
-		return err
-	}
-
-	return nil
+	_, err = n.PutSystemObject(ctx, s)
+	return err
 }
 
 // DeleteObjectTagging from storage.
@@ -721,7 +719,7 @@ func (n *layer) DeleteObjectTagging(ctx context.Context, p *data.ObjectInfo) err
 	if err != nil {
 		return err
 	}
-	return n.deleteSystemObject(ctx, bktInfo, p.TagsObject())
+	return n.DeleteSystemObject(ctx, bktInfo, p.TagsObject())
 }
 
 // DeleteBucketTagging from storage.
@@ -731,7 +729,7 @@ func (n *layer) DeleteBucketTagging(ctx context.Context, bucketName string) erro
 		return err
 	}
 
-	return n.deleteSystemObject(ctx, bktInfo, formBucketTagObjectName(bucketName))
+	return n.DeleteSystemObject(ctx, bktInfo, formBucketTagObjectName(bucketName))
 }
 
 // CopyObject from one bucket into another bucket.

api/layer/object.go

@@ -202,6 +202,7 @@ func (n *layer) objectPut(ctx context.Context, bkt *data.BucketInfo, p *PutObjec
 
 	if p.Lock != nil {
 		// todo form lock system object
+		// attributes = append(attributes, attributesFromLock(p.Lock)...)
 	}
 
 	meta, err := n.objectHead(ctx, bkt.CID, id)

api/layer/system_object.go

@@ -14,7 +14,12 @@ import (
 	"go.uber.org/zap"
 )
 
-func (n *layer) putSystemObject(ctx context.Context, p *PutSystemObjectParams) (*data.ObjectInfo, error) {
+const (
+	AttributeComplianceMode = ".s3-compliance-mode"
+	AttributeRetainUntil    = ".s3-retain-until"
+)
+
+func (n *layer) PutSystemObject(ctx context.Context, p *PutSystemObjectParams) (*data.ObjectInfo, error) {
 	objInfo, err := n.putSystemObjectIntoNeoFS(ctx, p)
 	if err != nil {
 		return nil, err
@@ -27,7 +32,7 @@ func (n *layer) putSystemObject(ctx context.Context, p *PutSystemObjectParams) (
 	return objInfo, nil
 }
 
-func (n *layer) headSystemObject(ctx context.Context, bkt *data.BucketInfo, objName string) (*data.ObjectInfo, error) {
+func (n *layer) HeadSystemObject(ctx context.Context, bkt *data.BucketInfo, objName string) (*data.ObjectInfo, error) {
 	if objInfo := n.systemCache.GetObject(systemObjectKey(bkt, objName)); objInfo != nil {
 		return objInfo, nil
 	}
@@ -44,7 +49,7 @@ func (n *layer) headSystemObject(ctx context.Context, bkt *data.BucketInfo, objN
 	return versions.getLast(), nil
 }
 
-func (n *layer) deleteSystemObject(ctx context.Context, bktInfo *data.BucketInfo, name string) error {
+func (n *layer) DeleteSystemObject(ctx context.Context, bktInfo *data.BucketInfo, name string) error {
 	f := &findParams{
 		attr: [2]string{objectSystemAttributeName, name},
 		cid:  bktInfo.CID,
@@ -92,6 +97,12 @@ func (n *layer) putSystemObjectIntoNeoFS(ctx context.Context, p *PutSystemObject
 			v = tagEmptyMark
 		}
 
+		if p.Lock != nil {
+			// todo form lock system object
+
+			prm.Attributes = append(prm.Attributes, attributesFromLock(p.Lock)...)
+		}
+
 		prm.Attributes = append(prm.Attributes, [2]string{k, v})
 	}
 
@@ -262,3 +273,21 @@ func (n *layer) PutBucketSettings(ctx context.Context, p *PutSettingsParams) err
 
 	return nil
 }
+
+func attributesFromLock(lock *data.ObjectLock) []*object.Attribute {
+	var result []*object.Attribute
+	if !lock.LegalHold {
+		attrRetainUntil := object.NewAttribute()
+		attrRetainUntil.SetKey(AttributeRetainUntil)
+		attrRetainUntil.SetValue(lock.Until.Format(time.RFC3339))
+		result = append(result, attrRetainUntil)
+		if lock.IsCompliance {
+			attrCompliance := object.NewAttribute()
+			attrCompliance.SetKey(AttributeComplianceMode)
+			attrCompliance.SetValue(strconv.FormatBool(true))
+			result = append(result, attrCompliance)
+		}
+	}
+
+	return result
+}

api/layer/versioning.go

@@ -399,7 +399,7 @@ func contains(list []string, elem string) bool {
 }
 
 func (n *layer) getBucketSettings(ctx context.Context, bktInfo *data.BucketInfo) (*data.BucketSettings, error) {
-	objInfo, err := n.headSystemObject(ctx, bktInfo, bktInfo.SettingsObjectName())
+	objInfo, err := n.HeadSystemObject(ctx, bktInfo, bktInfo.SettingsObjectName())
 	if err != nil {
 		return nil, err
 	}