[#340] Add notification configuration handlers

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>

api/cache/system.go

@@ -61,6 +61,20 @@ func (o *SystemCache) GetCORS(key string) *data.CORSConfiguration {
 	return result
 }
 
+func (o *SystemCache) GetNotificationConfiguration(key string) *data.NotificationConfiguration {
+	entry, err := o.cache.Get(key)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*data.NotificationConfiguration)
+	if !ok {
+		return nil
+	}
+
+	return result
+}
+
 // PutObject puts an object to cache.
 func (o *SystemCache) PutObject(key string, obj *data.ObjectInfo) error {
 	return o.cache.Set(key, obj)
@@ -70,6 +84,10 @@ func (o *SystemCache) PutCORS(key string, obj *data.CORSConfiguration) error {
 	return o.cache.Set(key, obj)
 }
 
+func (o *SystemCache) PutNotificationConfiguration(key string, obj *data.NotificationConfiguration) error {
+	return o.cache.Set(key, obj)
+}
+
 // Delete deletes an object from cache.
 func (o *SystemCache) Delete(key string) bool {
 	return o.cache.Remove(key)

api/data/info.go

@@ -10,8 +10,9 @@ import (
 )
 
 const (
-	bktVersionSettingsObject   = ".s3-versioning-settings"
+	bktVersionSettingsObject           = ".s3-versioning-settings"
-	bktCORSConfigurationObject = ".s3-cors"
+	bktCORSConfigurationObject         = ".s3-cors"
+	bktNotificationConfigurationObject = ".s3-notifications"
 )
 
 type (
@@ -65,6 +66,10 @@ func (b *BucketInfo) SettingsObjectName() string { return bktVersionSettingsObje
 // CORSObjectName returns system name for bucket CORS configuration file.
 func (b *BucketInfo) CORSObjectName() string { return bktCORSConfigurationObject }
 
+func (b *BucketInfo) NotificationConfigurationObjectName() string {
+	return bktNotificationConfigurationObject
+}
+
 // Version returns object version from ObjectInfo.
 func (o *ObjectInfo) Version() string { return o.ID.String() }
 

api/data/notifications.go

@@ -0,0 +1,69 @@
+package data
+
+type (
+	NotificationConfiguration struct {
+		QueueConfigurations []QueueConfiguration `xml:"QueueConfiguration" json:"QueueConfigurations"`
+		// Not supported topics
+		TopicConfigurations          []TopicConfiguration          `xml:"TopicConfiguration" json:"TopicConfigurations"`
+		LambdaFunctionConfigurations []LambdaFunctionConfiguration `xml:"CloudFunctionConfiguration" json:"CloudFunctionConfigurations"`
+	}
+
+	QueueConfiguration struct {
+		ID       string   `xml:"Id" json:"Id"`
+		QueueArn string   `xml:"Queue" json:"Queue"`
+		Events   []string `xml:"Event" json:"Events"`
+		Filter   Filter   `xml:"Filter" json:"Filter"`
+	}
+
+	Filter struct {
+		Key Key `xml:"S3Key" json:"S3Key"`
+	}
+
+	Key struct {
+		FilterRules []FilterRule `xml:"FilterRule" json:"FilterRules"`
+	}
+
+	FilterRule struct {
+		Name  string `xml:"Name" json:"Name"`
+		Value string `xml:"Value" json:"Value"`
+	}
+
+	// TopicConfiguration and LambdaFunctionConfiguration -- we don't support these configurations
+	// but we need them to detect in notification configurations in requests.
+	TopicConfiguration          struct{}
+	LambdaFunctionConfiguration struct{}
+)
+
+var ValidEvents = map[string]struct{}{
+	"s3:ReducedRedundancyLostObject":                   {},
+	"s3:ObjectCreated:*":                               {},
+	"s3:ObjectCreated:Put":                             {},
+	"s3:ObjectCreated:Post":                            {},
+	"s3:ObjectCreated:Copy":                            {},
+	"s3:ObjectCreated:CompleteMultipartUpload":         {},
+	"s3:ObjectRemoved:*":                               {},
+	"s3:ObjectRemoved:Delete":                          {},
+	"s3:ObjectRemoved:DeleteMarkerCreated":             {},
+	"s3:ObjectRestore:*":                               {},
+	"s3:ObjectRestore:Post":                            {},
+	"s3:ObjectRestore:Completed":                       {},
+	"s3:Replication:*":                                 {},
+	"s3:Replication:OperationFailedReplication":        {},
+	"s3:Replication:OperationNotTracked":               {},
+	"s3:Replication:OperationMissedThreshold":          {},
+	"s3:Replication:OperationReplicatedAfterThreshold": {},
+	"s3:ObjectRestore:Delete":                          {},
+	"s3:LifecycleTransition":                           {},
+	"s3:IntelligentTiering":                            {},
+	"s3:ObjectAcl:Put":                                 {},
+	"s3:LifecycleExpiration:*":                         {},
+	"s3:LifecycleExpiration:Delete":                    {},
+	"s3:LifecycleExpiration:DeleteMarkerCreated":       {},
+	"s3:ObjectTagging:*":                               {},
+	"s3:ObjectTagging:Put":                             {},
+	"s3:ObjectTagging:Delete":                          {},
+}
+
+func (n NotificationConfiguration) IsEmpty() bool {
+	return len(n.QueueConfigurations) == 0 && len(n.TopicConfigurations) == 0 && len(n.LambdaFunctionConfigurations) == 0
+}

api/errors/errors.go

@@ -153,6 +153,7 @@ const (
 	ErrInvalidToken
 
 	// Bucket notification related errors.
+	ErrNotificationNotEnabled
 	ErrEventNotification
 	ErrARNNotification
 	ErrRegionNotification
@@ -162,6 +163,7 @@ const (
 	ErrFilterNameSuffix
 	ErrFilterValueInvalid
 	ErrOverlappingConfigs
+	ErrNotificationTopicNotSupported
 
 	// S3 extended errors.
 	ErrContentSHA256Mismatch
@@ -869,6 +871,12 @@ var errorCodes = errorCodeMap{
 		Description:    "x-amz-object-lock-retain-until-date and x-amz-object-lock-mode must both be supplied",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrNotificationNotEnabled: {
+		ErrCode:        ErrNotificationNotEnabled,
+		Code:           "InvalidRequest",
+		Description:    "Notifications are not enabled in the gateway. Please connect to the other gateway",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	// Bucket notification related errors.
 	ErrEventNotification: {
 		ErrCode:        ErrEventNotification,
@@ -876,6 +884,12 @@ var errorCodes = errorCodeMap{
 		Description:    "A specified event is not supported for notifications.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrNotificationTopicNotSupported: {
+		ErrCode:        ErrNotificationTopicNotSupported,
+		Code:           "InvalidArgument",
+		Description:    "SNS and Lambda configurations are not supported ",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrARNNotification: {
 		ErrCode:        ErrARNNotification,
 		Code:           "InvalidArgument",

api/handler/not_support.go

@@ -18,7 +18,3 @@ func (h *handler) DeleteBucketLifecycleHandler(w http.ResponseWriter, r *http.Re
 func (h *handler) DeleteBucketEncryptionHandler(w http.ResponseWriter, r *http.Request) {
 	h.logAndSendError(w, "not supported", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
 }
-
-func (h *handler) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not supported", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotSupported))
-}

api/handler/notifications.go

@@ -0,0 +1,63 @@
+package handler
+
+import (
+	"encoding/xml"
+	"net/http"
+
+	"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/layer"
+)
+
+type NotificationConfiguration struct {
+	XMLName                   xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ NotificationConfiguation"`
+	NotificationConfiguration data.NotificationConfiguration
+}
+
+func (h *handler) PutBucketNotificationHandler(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
+	}
+
+	p := &layer.PutBucketNotificationConfigurationParams{
+		BktInfo: bktInfo,
+		Reader:  r.Body,
+	}
+
+	if err := h.obj.PutBucketNotificationConfiguration(r.Context(), p); err != nil {
+		h.logAndSendError(w, "couldn't put bucket configuration", reqInfo, err)
+		return
+	}
+}
+
+func (h *handler) GetBucketNotificationHandler(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
+	}
+	conf, err := h.obj.GetBucketNotificationConfiguration(r.Context(), bktInfo)
+	if err != nil {
+		h.logAndSendError(w, "could not get bucket notification configuration", reqInfo, err)
+		return
+	}
+
+	if err = api.EncodeToResponse(w, conf); err != nil {
+		h.logAndSendError(w, "could not encode bucket notification configuration to response", reqInfo, err)
+		return
+	}
+}

api/handler/unimplemented.go

@@ -63,10 +63,6 @@ func (h *handler) GetBucketObjectLockConfigHandler(w http.ResponseWriter, r *htt
 	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }
 
-func (h *handler) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
-}
-
 func (h *handler) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
 	h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
 }

api/layer/layer.go

@@ -235,6 +235,9 @@ type (
 		AbortMultipartUpload(ctx context.Context, p *UploadInfoParams) error
 		ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsInfo, error)
 		GetUploadInitInfo(ctx context.Context, p *UploadInfoParams) (*data.ObjectInfo, error)
+
+		PutBucketNotificationConfiguration(ctx context.Context, p *PutBucketNotificationConfigurationParams) error
+		GetBucketNotificationConfiguration(ctx context.Context, bktInfo *data.BucketInfo) (*data.NotificationConfiguration, error)
 	}
 )
 

api/layer/notifications.go

@@ -0,0 +1,146 @@
+package layer
+
+import (
+	"bytes"
+	"context"
+	"encoding/xml"
+	"io"
+
+	"github.com/google/uuid"
+	"github.com/nspcc-dev/neofs-s3-gw/api/data"
+	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
+	"go.uber.org/zap"
+)
+
+type (
+	PutBucketNotificationConfigurationParams struct {
+		BktInfo *data.BucketInfo
+		Reader  io.Reader
+	}
+)
+
+func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBucketNotificationConfigurationParams) error {
+	if !n.IsNotificationEnabled() {
+		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.checkAndCompleteNotificationConfiguration(conf); 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:   &buf,
+	}
+
+	obj, err := n.putSystemObjectIntoNeoFS(ctx, s)
+	if err != nil {
+		return err
+	}
+
+	if obj.Size == 0 && !conf.IsEmpty() {
+		return errors.GetAPIError(errors.ErrInternalError)
+	}
+
+	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(p.BktInfo, s.ObjName), conf); err != nil {
+		n.log.Error("couldn't cache system object", zap.Error(err))
+	}
+
+	return nil
+}
+
+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) {
+			return &data.NotificationConfiguration{}, nil
+		}
+		return nil, err
+	}
+
+	return conf, nil
+}
+
+func (n *layer) getNotificationConf(ctx context.Context, bkt *data.BucketInfo, sysName string) (*data.NotificationConfiguration, error) {
+	if conf := n.systemCache.GetNotificationConfiguration(systemObjectKey(bkt, sysName)); conf != nil {
+		return conf, nil
+	}
+
+	obj, err := n.getSystemObjectFromNeoFS(ctx, bkt, sysName)
+	if err != nil {
+		return nil, err
+	}
+
+	conf := &data.NotificationConfiguration{}
+
+	if err = xml.Unmarshal(obj.Payload(), &conf); err != nil {
+		return nil, err
+	}
+
+	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(bkt, sysName), conf); err != nil {
+		n.log.Warn("couldn't put system meta to objects cache",
+			zap.Stringer("object id", obj.ID()),
+			zap.Stringer("bucket id", bkt.CID),
+			zap.Error(err))
+	}
+
+	return conf, nil
+}
+
+func (n *layer) checkAndCompleteNotificationConfiguration(c *data.NotificationConfiguration) (completed bool, err error) {
+	if c == nil {
+		return
+	}
+
+	if c.TopicConfigurations != nil || c.LambdaFunctionConfigurations != nil {
+		return completed, errors.GetAPIError(errors.ErrNotificationTopicNotSupported)
+	}
+
+	for i, q := range c.QueueConfigurations {
+		if err = checkEvents(q.Events); err != nil {
+			return
+		}
+		if q.ID == "" {
+			completed = true
+			c.QueueConfigurations[i].ID = uuid.NewString()
+		}
+	}
+
+	return
+}
+
+func checkEvents(events []string) error {
+	for _, e := range events {
+		if _, ok := data.ValidEvents[e]; !ok {
+			return errors.GetAPIError(errors.ErrEventNotification)
+		}
+	}
+
+	return nil
+}