[#340] Add notification configuration handlers

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

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
+	}
+}