[#172] object: Allow to marshal `SplitInfo` to JSON

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

object/splitinfo.go

@@ -65,3 +65,13 @@ func (s *SplitInfo) Marshal() ([]byte, error) {
 func (s *SplitInfo) Unmarshal(data []byte) error {
 	return (*object.SplitInfo)(s).Unmarshal(data)
 }
+
+// MarshalJSON implements json.Marshaler.
+func (s *SplitInfo) MarshalJSON() ([]byte, error) {
+	return (*object.SplitInfo)(s).MarshalJSON()
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *SplitInfo) UnmarshalJSON(data []byte) error {
+	return (*object.SplitInfo)(s).UnmarshalJSON(data)
+}

object/splitinfo_test.go

@@ -2,6 +2,7 @@ package object_test
 
 import (
 	"crypto/rand"
+	"encoding/json"
 	"testing"
 
 	objv2 "github.com/nspcc-dev/neofs-api-go/v2/object"
@@ -87,3 +88,17 @@ func TestNewSplitInfo(t *testing.T) {
 		require.Nil(t, siV2.GetLink())
 	})
 }
+
+func TestSplitInfoMarshalJSON(t *testing.T) {
+	s := object.NewSplitInfo()
+	s.SetSplitID(object.NewSplitID())
+	s.SetLastPart(generateID())
+	s.SetLink(generateID())
+
+	data, err := s.MarshalJSON()
+	require.NoError(t, err)
+
+	actual := object.NewSplitInfo()
+	require.NoError(t, json.Unmarshal(data, actual))
+	require.Equal(t, s, actual)
+}