From 86351a8f908da5d8e896b983d078eefe11322ba0 Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Fri, 13 Nov 2020 16:40:00 +0300
Subject: [PATCH] [#168] session: Implement binary/JSON encoders/decoders on
 SessionContext

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 v2/session/json.go         | 26 ++++++++++++++++++++++++++
 v2/session/json_test.go    | 20 ++++++++++++++++++++
 v2/session/marshal.go      | 13 +++++++++++++
 v2/session/marshal_test.go |  6 ++----
 4 files changed, 61 insertions(+), 4 deletions(-)
 create mode 100644 v2/session/json.go
 create mode 100644 v2/session/json_test.go

diff --git a/v2/session/json.go b/v2/session/json.go
new file mode 100644
index 0000000..bb9489e
--- /dev/null
+++ b/v2/session/json.go
@@ -0,0 +1,26 @@
+package session
+
+import (
+	session "github.com/nspcc-dev/neofs-api-go/v2/session/grpc"
+	"google.golang.org/protobuf/encoding/protojson"
+)
+
+func (c *ObjectSessionContext) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		ObjectSessionContextToGRPCMessage(c),
+	)
+}
+
+func (c *ObjectSessionContext) UnmarshalJSON(data []byte) error {
+	msg := new(session.ObjectSessionContext)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*c = *ObjectSessionContextFromGRPCMessage(msg)
+
+	return nil
+}
diff --git a/v2/session/json_test.go b/v2/session/json_test.go
new file mode 100644
index 0000000..d76b6f4
--- /dev/null
+++ b/v2/session/json_test.go
@@ -0,0 +1,20 @@
+package session_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	"github.com/stretchr/testify/require"
+)
+
+func TestChecksumJSON(t *testing.T) {
+	ctx := generateObjectCtx("id")
+
+	data, err := ctx.MarshalJSON()
+	require.NoError(t, err)
+
+	ctx2 := new(session.ObjectSessionContext)
+	require.NoError(t, ctx2.UnmarshalJSON(data))
+
+	require.Equal(t, ctx, ctx2)
+}
diff --git a/v2/session/marshal.go b/v2/session/marshal.go
index 9bd4eb1..34e038e 100644
--- a/v2/session/marshal.go
+++ b/v2/session/marshal.go
@@ -2,6 +2,8 @@ package session
 
 import (
 	"github.com/nspcc-dev/neofs-api-go/util/proto"
+	session "github.com/nspcc-dev/neofs-api-go/v2/session/grpc"
+	goproto "google.golang.org/protobuf/proto"
 )
 
 const (
@@ -263,6 +265,17 @@ func (c *ObjectSessionContext) StableSize() (size int) {
 	return size
 }
 
+func (c *ObjectSessionContext) Unmarshal(data []byte) error {
+	m := new(session.ObjectSessionContext)
+	if err := goproto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*c = *ObjectSessionContextFromGRPCMessage(m)
+
+	return nil
+}
+
 func (t *SessionTokenBody) StableMarshal(buf []byte) ([]byte, error) {
 	if t == nil {
 		return []byte{}, nil
diff --git a/v2/session/marshal_test.go b/v2/session/marshal_test.go
index 8e35d86..8fd889e 100644
--- a/v2/session/marshal_test.go
+++ b/v2/session/marshal_test.go
@@ -78,16 +78,14 @@ func TestTokenLifetime_StableMarshal(t *testing.T) {
 
 func TestObjectSessionContext_StableMarshal(t *testing.T) {
 	objectCtxFrom := generateObjectCtx("Object ID")
-	transport := new(grpc.ObjectSessionContext)
 
 	t.Run("non empty", func(t *testing.T) {
 		wire, err := objectCtxFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
-		err = goproto.Unmarshal(wire, transport)
-		require.NoError(t, err)
+		objectCtxTo := new(session.ObjectSessionContext)
+		require.NoError(t, objectCtxTo.Unmarshal(wire))
 
-		objectCtxTo := session.ObjectSessionContextFromGRPCMessage(transport)
 		require.Equal(t, objectCtxFrom, objectCtxTo)
 	})
 }