[#391] Refactor notifications

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

api/handler/api.go

@@ -13,13 +13,20 @@ type (
 	handler struct {
 		log         *zap.Logger
 		obj         layer.Client
+		notificator Notificator
 		cfg         *Config
 	}
 
+	Notificator interface {
+		SendNotifications(topics map[string]string, p *SendNotificationParams) error
+		SendTestNotification(topic, bucketName, requestID, HostID string) error
+	}
+
 	// Config contains data which handler needs to keep.
 	Config struct {
 		DefaultPolicy      *netmap.PlacementPolicy
 		DefaultMaxAge      int
+		NotificatorEnabled bool
 	}
 )
 
@@ -29,7 +36,7 @@ const DefaultPolicy = "REP 3"
 var _ api.Handler = (*handler)(nil)
 
 // New creates new api.Handler using given logger and client.
-func New(log *zap.Logger, obj layer.Client, cfg *Config) (api.Handler, error) {
+func New(log *zap.Logger, obj layer.Client, notificator Notificator, cfg *Config) (api.Handler, error) {
 	switch {
 	case obj == nil:
 		return nil, errors.New("empty NeoFS Object Layer")
@@ -37,9 +44,14 @@ func New(log *zap.Logger, obj layer.Client, cfg *Config) (api.Handler, error) {
 		return nil, errors.New("empty logger")
 	}
 
+	if cfg.NotificatorEnabled && notificator == nil {
+		return nil, errors.New("empty notificator")
+	}
+
 	return &handler{
 		log:         log,
 		obj:         obj,
 		cfg:         cfg,
+		notificator: notificator,
 	}, nil
 }

api/handler/copy.go

@@ -134,13 +134,13 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		zap.String("object", info.Name),
 		zap.Stringer("object_id", info.ID))
 
-	s := &layer.SendNotificationParams{
+	s := &SendNotificationParams{
-		Event:   layer.EventObjectCreatedCopy,
+		Event:   EventObjectCreatedCopy,
 		ObjInfo: info,
 		BktInfo: dstBktInfo,
 		ReqInfo: reqInfo,
 	}
-	if err := h.obj.SendNotifications(r.Context(), s); err != nil {
+	if err = h.sendNotifications(r.Context(), s); err != nil {
 		h.log.Error("couldn't send notification: %w", zap.Error(err))
 	}
 }

api/handler/delete.go

@@ -97,11 +97,11 @@ func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 			zap.Error(err))
 	}
 
-	var m *layer.SendNotificationParams
+	var m *SendNotificationParams
 
 	if bktSettings.VersioningEnabled && len(versionID) == 0 {
-		m = &layer.SendNotificationParams{
+		m = &SendNotificationParams{
-			Event: layer.EventObjectRemovedDeleteMarkerCreated,
+			Event: EventObjectRemovedDeleteMarkerCreated,
 			ObjInfo: &data.ObjectInfo{
 				Name:    reqInfo.ObjectName,
 				HashSum: deletedObject.DeleteMarkerEtag,
@@ -117,8 +117,8 @@ func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 
-		m = &layer.SendNotificationParams{
+		m = &SendNotificationParams{
-			Event: layer.EventObjectRemovedDelete,
+			Event: EventObjectRemovedDelete,
 			ObjInfo: &data.ObjectInfo{
 				Name: reqInfo.ObjectName,
 				ID:   &objID,
@@ -128,7 +128,7 @@ func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	if err := h.obj.SendNotifications(r.Context(), m); err != nil {
+	if err = h.sendNotifications(r.Context(), m); err != nil {
 		h.log.Error("couldn't send notification: %w", zap.Error(err))
 	}
 

api/handler/multipart_upload.go

@@ -436,13 +436,13 @@ func (h *handler) CompleteMultipartUploadHandler(w http.ResponseWriter, r *http.
 		}
 	}
 
-	s := &layer.SendNotificationParams{
+	s := &SendNotificationParams{
-		Event:   layer.EventObjectCreatedCompleteMultipartUpload,
+		Event:   EventObjectCreatedCompleteMultipartUpload,
 		ObjInfo: objInfo,
 		BktInfo: bktInfo,
 		ReqInfo: reqInfo,
 	}
-	if err := h.obj.SendNotifications(r.Context(), s); err != nil {
+	if err = h.sendNotifications(r.Context(), s); err != nil {
 		h.log.Error("couldn't send notification: %w", zap.Error(err))
 	}
 

api/handler/notifications.go

@@ -1,18 +1,96 @@
 package handler
 
 import (
+	"context"
 	"encoding/xml"
 	"net/http"
+	"strings"
 
+	"github.com/google/uuid"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
 	"github.com/nspcc-dev/neofs-s3-gw/api/data"
+	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
 	"github.com/nspcc-dev/neofs-s3-gw/api/layer"
+	"go.uber.org/zap"
 )
 
-type NotificationConfiguration struct {
+type (
+	SendNotificationParams struct {
+		Event   string
+		ObjInfo *data.ObjectInfo
+		BktInfo *data.BucketInfo
+		ReqInfo *api.ReqInfo
+		User    string
+	}
+
+	NotificationConfiguration struct {
 		XMLName                   xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ NotificationConfiguation"`
 		NotificationConfiguration data.NotificationConfiguration
 	}
+)
+
+const (
+	filterRuleSuffixName = "suffix"
+	filterRulePrefixName = "prefix"
+
+	EventObjectCreated                                = "s3:ObjectCreated:*"
+	EventObjectCreatedPut                             = "s3:ObjectCreated:Put"
+	EventObjectCreatedPost                            = "s3:ObjectCreated:Post"
+	EventObjectCreatedCopy                            = "s3:ObjectCreated:Copy"
+	EventReducedRedundancyLostObject                  = "s3:ReducedRedundancyLostObject"
+	EventObjectCreatedCompleteMultipartUpload         = "s3:ObjectCreated:CompleteMultipartUpload"
+	EventObjectRemoved                                = "s3:ObjectRemoved:*"
+	EventObjectRemovedDelete                          = "s3:ObjectRemoved:Delete"
+	EventObjectRemovedDeleteMarkerCreated             = "s3:ObjectRemoved:DeleteMarkerCreated"
+	EventObjectRestore                                = "s3:ObjectRestore:*"
+	EventObjectRestorePost                            = "s3:ObjectRestore:Post"
+	EventObjectRestoreCompleted                       = "s3:ObjectRestore:Completed"
+	EventReplication                                  = "s3:Replication:*"
+	EventReplicationOperationFailedReplication        = "s3:Replication:OperationFailedReplication"
+	EventReplicationOperationNotTracked               = "s3:Replication:OperationNotTracked"
+	EventReplicationOperationMissedThreshold          = "s3:Replication:OperationMissedThreshold"
+	EventReplicationOperationReplicatedAfterThreshold = "s3:Replication:OperationReplicatedAfterThreshold"
+	EventObjectRestoreDelete                          = "s3:ObjectRestore:Delete"
+	EventLifecycleTransition                          = "s3:LifecycleTransition"
+	EventIntelligentTiering                           = "s3:IntelligentTiering"
+	EventObjectACLPut                                 = "s3:ObjectAcl:Put"
+	EventLifecycleExpiration                          = "s3:LifecycleExpiration:*"
+	EventLifecycleExpirationDelete                    = "s3:LifecycleExpiration:Delete"
+	EventLifecycleExpirationDeleteMarkerCreated       = "s3:LifecycleExpiration:DeleteMarkerCreated"
+	EventObjectTagging                                = "s3:ObjectTagging:*"
+	EventObjectTaggingPut                             = "s3:ObjectTagging:Put"
+	EventObjectTaggingDelete                          = "s3:ObjectTagging:Delete"
+)
+
+var validEvents = map[string]struct{}{
+	EventReducedRedundancyLostObject:                  {},
+	EventObjectCreated:                                {},
+	EventObjectCreatedPut:                             {},
+	EventObjectCreatedPost:                            {},
+	EventObjectCreatedCopy:                            {},
+	EventObjectCreatedCompleteMultipartUpload:         {},
+	EventObjectRemoved:                                {},
+	EventObjectRemovedDelete:                          {},
+	EventObjectRemovedDeleteMarkerCreated:             {},
+	EventObjectRestore:                                {},
+	EventObjectRestorePost:                            {},
+	EventObjectRestoreCompleted:                       {},
+	EventReplication:                                  {},
+	EventReplicationOperationFailedReplication:        {},
+	EventReplicationOperationNotTracked:               {},
+	EventReplicationOperationMissedThreshold:          {},
+	EventReplicationOperationReplicatedAfterThreshold: {},
+	EventObjectRestoreDelete:                          {},
+	EventLifecycleTransition:                          {},
+	EventIntelligentTiering:                           {},
+	EventObjectACLPut:                                 {},
+	EventLifecycleExpiration:                          {},
+	EventLifecycleExpirationDelete:                    {},
+	EventLifecycleExpirationDeleteMarkerCreated:       {},
+	EventObjectTagging:                                {},
+	EventObjectTaggingPut:                             {},
+	EventObjectTaggingDelete:                          {},
+}
 
 func (h *handler) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
 	reqInfo := api.GetReqInfo(r.Context())
@@ -22,13 +100,24 @@ func (h *handler) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 
+	conf := &data.NotificationConfiguration{}
+	if err = xml.NewDecoder(r.Body).Decode(conf); err != nil {
+		h.logAndSendError(w, "couldn't decode notification configuration", reqInfo, errors.GetAPIError(errors.ErrMalformedXML))
+		return
+	}
+
+	if _, err = h.checkBucketConfiguration(conf, reqInfo); err != nil {
+		h.logAndSendError(w, "couldn't check bucket configuration", reqInfo, err)
+		return
+	}
+
 	p := &layer.PutBucketNotificationConfigurationParams{
 		RequestInfo:   reqInfo,
 		BktInfo:       bktInfo,
-		Reader:      r.Body,
+		Configuration: conf,
 	}
 
-	if err := h.obj.PutBucketNotificationConfiguration(r.Context(), p); err != nil {
+	if err = h.obj.PutBucketNotificationConfiguration(r.Context(), p); err != nil {
 		h.logAndSendError(w, "couldn't put bucket configuration", reqInfo, err)
 		return
 	}
@@ -54,3 +143,127 @@ func (h *handler) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 }
+
+func (h *handler) sendNotifications(ctx context.Context, p *SendNotificationParams) error {
+	if !h.cfg.NotificatorEnabled {
+		h.log.Debug("could not send notification because notificator is disabled", zap.String("event", p.Event))
+		return nil
+	}
+
+	conf, err := h.obj.GetBucketNotificationConfiguration(ctx, p.BktInfo)
+	if err != nil {
+		return err
+	}
+	if conf.IsEmpty() {
+		return nil
+	}
+
+	box, err := layer.GetBoxData(ctx)
+	if err == nil {
+		p.User = box.Gate.BearerToken.OwnerID().String()
+	}
+
+	topics := filterSubjects(conf, p.Event, p.ObjInfo.Name)
+
+	return h.notificator.SendNotifications(topics, p)
+}
+
+// checkBucketConfiguration checks notification configuration and generates an ID for configurations with empty ids.
+func (h *handler) checkBucketConfiguration(conf *data.NotificationConfiguration, r *api.ReqInfo) (completed bool, err error) {
+	if conf == nil {
+		return
+	}
+
+	if conf.TopicConfigurations != nil || conf.LambdaFunctionConfigurations != nil {
+		return completed, errors.GetAPIError(errors.ErrNotificationTopicNotSupported)
+	}
+
+	for i, q := range conf.QueueConfigurations {
+		if err = checkEvents(q.Events); err != nil {
+			return
+		}
+
+		if err = checkRules(q.Filter.Key.FilterRules); err != nil {
+			return
+		}
+
+		if h.cfg.NotificatorEnabled {
+			if err = h.notificator.SendTestNotification(q.QueueArn, r.BucketName, r.RequestID, r.Host); err != nil {
+				return
+			}
+		} else {
+			h.log.Warn("failed to send test event because notifications is disabled")
+		}
+
+		if q.ID == "" {
+			completed = true
+			conf.QueueConfigurations[i].ID = uuid.NewString()
+		}
+	}
+
+	return
+}
+
+func checkRules(rules []data.FilterRule) error {
+	names := make(map[string]struct{})
+
+	for _, r := range rules {
+		if r.Name != filterRuleSuffixName && r.Name != filterRulePrefixName {
+			return errors.GetAPIError(errors.ErrFilterNameInvalid)
+		}
+		if _, ok := names[r.Name]; ok {
+			if r.Name == filterRuleSuffixName {
+				return errors.GetAPIError(errors.ErrFilterNameSuffix)
+			}
+			return errors.GetAPIError(errors.ErrFilterNamePrefix)
+		}
+
+		names[r.Name] = struct{}{}
+	}
+
+	return nil
+}
+
+func checkEvents(events []string) error {
+	for _, e := range events {
+		if _, ok := validEvents[e]; !ok {
+			return errors.GetAPIError(errors.ErrEventNotification)
+		}
+	}
+
+	return nil
+}
+
+func filterSubjects(conf *data.NotificationConfiguration, eventType, objName string) map[string]string {
+	topics := make(map[string]string)
+
+	for _, t := range conf.QueueConfigurations {
+		event := false
+		for _, e := range t.Events {
+			// the second condition is comparison with the events ending with *:
+			// s3:ObjectCreated:*, s3:ObjectRemoved:* etc without the last char
+			if eventType == e || strings.HasPrefix(eventType, e[:len(e)-1]) {
+				event = true
+				break
+			}
+		}
+
+		if !event {
+			continue
+		}
+
+		filter := true
+		for _, f := range t.Filter.Key.FilterRules {
+			if f.Name == filterRulePrefixName && !strings.HasPrefix(objName, f.Value) ||
+				f.Name == filterRuleSuffixName && !strings.HasSuffix(objName, f.Value) {
+				filter = false
+				break
+			}
+		}
+		if filter {
+			topics[t.ID] = t.QueueArn
+		}
+	}
+
+	return topics
+}

api/handler/notifications_test.go

@@ -1,4 +1,4 @@
-package layer
+package handler
 
 import (
 	"testing"

api/handler/put.go

@@ -237,13 +237,13 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	s := &layer.SendNotificationParams{
+	s := &SendNotificationParams{
-		Event:   layer.EventObjectCreatedPut,
+		Event:   EventObjectCreatedPut,
 		ObjInfo: info,
 		BktInfo: bktInfo,
 		ReqInfo: reqInfo,
 	}
-	if err := h.obj.SendNotifications(r.Context(), s); err != nil {
+	if err = h.sendNotifications(r.Context(), s); err != nil {
 		h.log.Error("couldn't send notification: %w", zap.Error(err))
 	}
 
@@ -354,13 +354,13 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	s := &layer.SendNotificationParams{
+	s := &SendNotificationParams{
-		Event:   layer.EventObjectCreatedPost,
+		Event:   EventObjectCreatedPost,
 		ObjInfo: info,
 		BktInfo: bktInfo,
 		ReqInfo: reqInfo,
 	}
-	if err := h.obj.SendNotifications(r.Context(), s); err != nil {
+	if err = h.sendNotifications(r.Context(), s); err != nil {
 		h.log.Error("couldn't send notification: %w", zap.Error(err))
 	}
 

api/layer/layer.go

@@ -28,11 +28,9 @@ import (
 )
 
 type (
-	Notificator interface {
+	EventListener interface {
 		Subscribe(context.Context, string, MsgHandler) error
 		Listen(context.Context)
-		SendNotifications(topics map[string]string, p *SendNotificationParams) error
-		SendTestNotification(topic, bucketName, requestID, HostID string) error
 	}
 
 	MsgHandler interface {
@@ -46,7 +44,7 @@ type (
 		log         *zap.Logger
 		anonKey     AnonymousKey
 		resolver    *resolver.BucketResolver
-		ncontroller Notificator
+		ncontroller EventListener
 		listsCache  *cache.ObjectsListCache
 		objCache    *cache.ObjectsCache
 		namesCache  *cache.ObjectsNameCache
@@ -192,7 +190,7 @@ type (
 
 	// Client provides S3 API client interface.
 	Client interface {
-		Initialize(ctx context.Context, c Notificator) error
+		Initialize(ctx context.Context, c EventListener) error
 		EphemeralKey() *keys.PublicKey
 
 		GetBucketSettings(ctx context.Context, bktInfo *data.BucketInfo) (*data.BucketSettings, error)
@@ -241,8 +239,6 @@ type (
 
 		PutBucketNotificationConfiguration(ctx context.Context, p *PutBucketNotificationConfigurationParams) error
 		GetBucketNotificationConfiguration(ctx context.Context, bktInfo *data.BucketInfo) (*data.NotificationConfiguration, error)
-
-		SendNotifications(ctx context.Context, p *SendNotificationParams) error
 	}
 )
 
@@ -290,7 +286,7 @@ func (n *layer) EphemeralKey() *keys.PublicKey {
 	return n.anonKey.Key.PublicKey()
 }
 
-func (n *layer) Initialize(ctx context.Context, c Notificator) error {
+func (n *layer) Initialize(ctx context.Context, c EventListener) error {
 	if n.IsNotificationEnabled() {
 		return fmt.Errorf("already initialized")
 	}

api/layer/notifications.go

@@ -4,130 +4,30 @@ import (
 	"bytes"
 	"context"
 	"encoding/xml"
-	"io"
-	"strings"
 
-	"github.com/google/uuid"
 	"github.com/nspcc-dev/neofs-s3-gw/api"
 	"github.com/nspcc-dev/neofs-s3-gw/api/data"
 	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
 	"go.uber.org/zap"
 )
 
-type (
+type PutBucketNotificationConfigurationParams struct {
-	PutBucketNotificationConfigurationParams struct {
 	RequestInfo   *api.ReqInfo
 	BktInfo       *data.BucketInfo
-		Reader      io.Reader
+	Configuration *data.NotificationConfiguration
-	}
-
-	SendNotificationParams struct {
-		Event   string
-		ObjInfo *data.ObjectInfo
-		BktInfo *data.BucketInfo
-		ReqInfo *api.ReqInfo
-		User    string
-	}
-)
-
-const (
-	filterRuleSuffixName = "suffix"
-	filterRulePrefixName = "prefix"
-
-	EventObjectCreated                                = "s3:ObjectCreated:*"
-	EventObjectCreatedPut                             = "s3:ObjectCreated:Put"
-	EventObjectCreatedPost                            = "s3:ObjectCreated:Post"
-	EventObjectCreatedCopy                            = "s3:ObjectCreated:Copy"
-	EventReducedRedundancyLostObject                  = "s3:ReducedRedundancyLostObject"
-	EventObjectCreatedCompleteMultipartUpload         = "s3:ObjectCreated:CompleteMultipartUpload"
-	EventObjectRemoved                                = "s3:ObjectRemoved:*"
-	EventObjectRemovedDelete                          = "s3:ObjectRemoved:Delete"
-	EventObjectRemovedDeleteMarkerCreated             = "s3:ObjectRemoved:DeleteMarkerCreated"
-	EventObjectRestore                                = "s3:ObjectRestore:*"
-	EventObjectRestorePost                            = "s3:ObjectRestore:Post"
-	EventObjectRestoreCompleted                       = "s3:ObjectRestore:Completed"
-	EventReplication                                  = "s3:Replication:*"
-	EventReplicationOperationFailedReplication        = "s3:Replication:OperationFailedReplication"
-	EventReplicationOperationNotTracked               = "s3:Replication:OperationNotTracked"
-	EventReplicationOperationMissedThreshold          = "s3:Replication:OperationMissedThreshold"
-	EventReplicationOperationReplicatedAfterThreshold = "s3:Replication:OperationReplicatedAfterThreshold"
-	EventObjectRestoreDelete                          = "s3:ObjectRestore:Delete"
-	EventLifecycleTransition                          = "s3:LifecycleTransition"
-	EventIntelligentTiering                           = "s3:IntelligentTiering"
-	EventObjectACLPut                                 = "s3:ObjectAcl:Put"
-	EventLifecycleExpiration                          = "s3:LifecycleExpiration:*"
-	EventLifecycleExpirationDelete                    = "s3:LifecycleExpiration:Delete"
-	EventLifecycleExpirationDeleteMarkerCreated       = "s3:LifecycleExpiration:DeleteMarkerCreated"
-	EventObjectTagging                                = "s3:ObjectTagging:*"
-	EventObjectTaggingPut                             = "s3:ObjectTagging:Put"
-	EventObjectTaggingDelete                          = "s3:ObjectTagging:Delete"
-)
-
-var validEvents = map[string]struct{}{
-	EventReducedRedundancyLostObject:                  {},
-	EventObjectCreated:                                {},
-	EventObjectCreatedPut:                             {},
-	EventObjectCreatedPost:                            {},
-	EventObjectCreatedCopy:                            {},
-	EventObjectCreatedCompleteMultipartUpload:         {},
-	EventObjectRemoved:                                {},
-	EventObjectRemovedDelete:                          {},
-	EventObjectRemovedDeleteMarkerCreated:             {},
-	EventObjectRestore:                                {},
-	EventObjectRestorePost:                            {},
-	EventObjectRestoreCompleted:                       {},
-	EventReplication:                                  {},
-	EventReplicationOperationFailedReplication:        {},
-	EventReplicationOperationNotTracked:               {},
-	EventReplicationOperationMissedThreshold:          {},
-	EventReplicationOperationReplicatedAfterThreshold: {},
-	EventObjectRestoreDelete:                          {},
-	EventLifecycleTransition:                          {},
-	EventIntelligentTiering:                           {},
-	EventObjectACLPut:                                 {},
-	EventLifecycleExpiration:                          {},
-	EventLifecycleExpirationDelete:                    {},
-	EventLifecycleExpirationDeleteMarkerCreated:       {},
-	EventObjectTagging:                                {},
-	EventObjectTaggingPut:                             {},
-	EventObjectTaggingDelete:                          {},
 }
 
 func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBucketNotificationConfigurationParams) error {
-	if !n.IsNotificationEnabled() {
+	confXML, err := xml.Marshal(p.Configuration)
-		return errors.GetAPIError(errors.ErrNotificationNotEnabled)
-	}
-
-	var (
-		buf       bytes.Buffer
-		tee       = io.TeeReader(p.Reader, &buf)
-		conf      = &data.NotificationConfiguration{}
-		completed bool
-		err       error
-	)
-
-	if err = xml.NewDecoder(tee).Decode(conf); err != nil {
-		return errors.GetAPIError(errors.ErrMalformedXML)
-	}
-
-	if completed, err = n.checkBucketConfiguration(conf, p.RequestInfo); err != nil {
-		return err
-	}
-	if completed {
-		confXML, err := xml.Marshal(conf)
 	if err != nil {
 		return err
 	}
-		buf.Reset()
-		buf.Write(confXML)
-	}
 
 	s := &PutSystemObjectParams{
 		BktInfo:  p.BktInfo,
 		ObjName:  p.BktInfo.NotificationConfigurationObjectName(),
 		Metadata: map[string]string{},
-		Prefix:   "",
+		Reader:   bytes.NewReader(confXML),
-		Reader:   &buf,
 	}
 
 	obj, err := n.putSystemObjectIntoNeoFS(ctx, s)
@@ -135,11 +35,11 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 		return err
 	}
 
-	if obj.Size == 0 && !conf.IsEmpty() {
+	if obj.Size == 0 && !p.Configuration.IsEmpty() {
 		return errors.GetAPIError(errors.ErrInternalError)
 	}
 
-	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(p.BktInfo, s.ObjName), conf); err != nil {
+	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(p.BktInfo, s.ObjName), p.Configuration); err != nil {
 		n.log.Error("couldn't cache system object", zap.Error(err))
 	}
 
@@ -147,9 +47,6 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 }
 
 func (n *layer) GetBucketNotificationConfiguration(ctx context.Context, bktInfo *data.BucketInfo) (*data.NotificationConfiguration, error) {
-	if !n.IsNotificationEnabled() {
-		return nil, errors.GetAPIError(errors.ErrNotificationNotEnabled)
-	}
 	conf, err := n.getNotificationConf(ctx, bktInfo, bktInfo.NotificationConfigurationObjectName())
 	if err != nil {
 		if errors.IsS3Error(err, errors.ErrNoSuchKey) {
@@ -187,122 +84,3 @@ func (n *layer) getNotificationConf(ctx context.Context, bkt *data.BucketInfo, s
 
 	return conf, nil
 }
-
-func (n *layer) SendNotifications(ctx context.Context, p *SendNotificationParams) error {
-	if !n.IsNotificationEnabled() {
-		return nil
-	}
-
-	conf, err := n.getNotificationConf(ctx, p.BktInfo, p.BktInfo.NotificationConfigurationObjectName())
-	if err != nil {
-		return err
-	}
-	if conf.IsEmpty() {
-		return nil
-	}
-
-	box, err := GetBoxData(ctx)
-	if err == nil {
-		p.User = box.Gate.BearerToken.OwnerID().String()
-	}
-
-	topics := filterSubjects(conf, p.Event, p.ObjInfo.Name)
-
-	return n.ncontroller.SendNotifications(topics, p)
-}
-
-// checkBucketConfiguration checks notification configuration and generates an ID for configurations with empty ids.
-func (n *layer) checkBucketConfiguration(conf *data.NotificationConfiguration, r *api.ReqInfo) (completed bool, err error) {
-	if conf == nil {
-		return
-	}
-
-	if conf.TopicConfigurations != nil || conf.LambdaFunctionConfigurations != nil {
-		return completed, errors.GetAPIError(errors.ErrNotificationTopicNotSupported)
-	}
-
-	for i, q := range conf.QueueConfigurations {
-		if err = checkEvents(q.Events); err != nil {
-			return
-		}
-
-		if err = checkRules(q.Filter.Key.FilterRules); err != nil {
-			return
-		}
-
-		if err = n.ncontroller.SendTestNotification(q.QueueArn, r.BucketName, r.RequestID, r.Host); err != nil {
-			return
-		}
-
-		if q.ID == "" {
-			completed = true
-			conf.QueueConfigurations[i].ID = uuid.NewString()
-		}
-	}
-
-	return
-}
-
-func filterSubjects(conf *data.NotificationConfiguration, eventType, objName string) map[string]string {
-	topics := make(map[string]string)
-
-	for _, t := range conf.QueueConfigurations {
-		event := false
-		for _, e := range t.Events {
-			// the second condition is comparison with the events ending with *:
-			// s3:ObjectCreated:*, s3:ObjectRemoved:* etc without the last char
-			if eventType == e || strings.HasPrefix(eventType, e[:len(e)-1]) {
-				event = true
-				break
-			}
-		}
-
-		if !event {
-			continue
-		}
-
-		filter := true
-		for _, f := range t.Filter.Key.FilterRules {
-			if f.Name == filterRulePrefixName && !strings.HasPrefix(objName, f.Value) ||
-				f.Name == filterRuleSuffixName && !strings.HasSuffix(objName, f.Value) {
-				filter = false
-				break
-			}
-		}
-		if filter {
-			topics[t.ID] = t.QueueArn
-		}
-	}
-
-	return topics
-}
-
-func checkRules(rules []data.FilterRule) error {
-	names := make(map[string]struct{})
-
-	for _, r := range rules {
-		if r.Name != filterRuleSuffixName && r.Name != filterRulePrefixName {
-			return errors.GetAPIError(errors.ErrFilterNameInvalid)
-		}
-		if _, ok := names[r.Name]; ok {
-			if r.Name == filterRuleSuffixName {
-				return errors.GetAPIError(errors.ErrFilterNameSuffix)
-			}
-			return errors.GetAPIError(errors.ErrFilterNamePrefix)
-		}
-
-		names[r.Name] = struct{}{}
-	}
-
-	return nil
-}
-
-func checkEvents(events []string) error {
-	for _, e := range events {
-		if _, ok := validEvents[e]; !ok {
-			return errors.GetAPIError(errors.ErrEventNotification)
-		}
-	}
-
-	return nil
-}

api/notifications/controller.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/nats-io/nats.go"
+	"github.com/nspcc-dev/neofs-s3-gw/api/handler"
 	"github.com/nspcc-dev/neofs-s3-gw/api/layer"
 	"go.uber.org/zap"
 )
@@ -179,7 +180,7 @@ func (c *Controller) Listen(ctx context.Context) {
 	}
 }
 
-func (c *Controller) SendNotifications(topics map[string]string, p *layer.SendNotificationParams) error {
+func (c *Controller) SendNotifications(topics map[string]string, p *handler.SendNotificationParams) error {
 	event := prepareEvent(p)
 
 	for id, topic := range topics {
@@ -214,7 +215,7 @@ func (c *Controller) SendTestNotification(topic, bucketName, requestID, HostID s
 	return c.publish(topic, msg)
 }
 
-func prepareEvent(p *layer.SendNotificationParams) *Event {
+func prepareEvent(p *handler.SendNotificationParams) *Event {
 	return &Event{
 		Records: []EventRecord{
 			{

cmd/s3-gw/app.go

@@ -170,7 +170,7 @@ func newApp(ctx context.Context, l *zap.Logger, v *viper.Viper) *App {
 	ctr = auth.New(neofs.NewAuthmateNeoFS(conns), key, getAccessBoxCacheConfig(v, l))
 	handlerOptions := getHandlerOptions(v, l)
 
-	if caller, err = handler.New(l, obj, handlerOptions); err != nil {
+	if caller, err = handler.New(l, obj, nc, handlerOptions); err != nil {
 		l.Fatal("could not initialize API handler", zap.Error(err))
 	}
 
@@ -386,6 +386,7 @@ func getHandlerOptions(v *viper.Viper, l *zap.Logger) *handler.Config {
 	}
 
 	cfg.DefaultMaxAge = defaultMaxAge
+	cfg.NotificatorEnabled = v.GetBool(cfgEnableNATS)
 
 	return &cfg
 }