[#168] session: Implement binary/JSON encoders/decoders on SessionToken

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/token/session.go

@@ -76,3 +76,47 @@ func (t *SessionToken) Signature() *pkg.Signature {
 			GetSignature(),
 	)
 }
+
+// Marshal marshals SessionToken into a protobuf binary form.
+//
+// Buffer is allocated when the argument is empty.
+// Otherwise, the first buffer is used.
+func (t *SessionToken) Marshal(bs ...[]byte) ([]byte, error) {
+	var buf []byte
+	if len(bs) > 0 {
+		buf = bs[0]
+	}
+
+	return (*session.SessionToken)(t).
+		StableMarshal(buf)
+}
+
+// Unmarshal unmarshals protobuf binary representation of SessionToken.
+func (t *SessionToken) Unmarshal(data []byte) error {
+	tV2 := new(session.SessionToken)
+	if err := tV2.Unmarshal(data); err != nil {
+		return err
+	}
+
+	*t = *NewSessionTokenFromV2(tV2)
+
+	return nil
+}
+
+// MarshalJSON encodes SessionToken to protobuf JSON format.
+func (t *SessionToken) MarshalJSON() ([]byte, error) {
+	return (*session.SessionToken)(t).
+		MarshalJSON()
+}
+
+// UnmarshalJSON decodes SessionToken from protobuf JSON format.
+func (t *SessionToken) UnmarshalJSON(data []byte) error {
+	tV2 := new(session.SessionToken)
+	if err := tV2.UnmarshalJSON(data); err != nil {
+		return err
+	}
+
+	*t = *NewSessionTokenFromV2(tV2)
+
+	return nil
+}

pkg/token/session_test.go

@@ -40,3 +40,28 @@ func TestSessionToken_SetSessionKey(t *testing.T) {
 
 	require.Equal(t, key, token.SessionKey())
 }
+
+func TestSessionTokenEncoding(t *testing.T) {
+	tok := NewSessionToken()
+	tok.SetID([]byte("id"))
+
+	t.Run("binary", func(t *testing.T) {
+		data, err := tok.Marshal()
+		require.NoError(t, err)
+
+		tok2 := NewSessionToken()
+		require.NoError(t, tok2.Unmarshal(data))
+
+		require.Equal(t, tok, tok2)
+	})
+
+	t.Run("json", func(t *testing.T) {
+		data, err := tok.MarshalJSON()
+		require.NoError(t, err)
+
+		tok2 := NewSessionToken()
+		require.NoError(t, tok2.UnmarshalJSON(data))
+
+		require.Equal(t, tok, tok2)
+	})
+}

v2/session/json.go

@@ -64,3 +64,23 @@ func (t *SessionTokenBody) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (t *SessionToken) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		SessionTokenToGRPCMessage(t),
+	)
+}
+
+func (t *SessionToken) UnmarshalJSON(data []byte) error {
+	msg := new(session.SessionToken)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*t = *SessionTokenFromGRPCMessage(msg)
+
+	return nil
+}

v2/session/json_test.go

@@ -42,3 +42,15 @@ func TestSessionTokenBodyJSON(t *testing.T) {
 
 	require.Equal(t, b, b2)
 }
+
+func TestSessionTokenJSON(t *testing.T) {
+	tok := generateSessionToken("id")
+
+	data, err := tok.MarshalJSON()
+	require.NoError(t, err)
+
+	tok2 := new(session.SessionToken)
+	require.NoError(t, tok2.UnmarshalJSON(data))
+
+	require.Equal(t, tok, tok2)
+}

v2/session/marshal.go

@@ -417,6 +417,17 @@ func (t *SessionToken) StableSize() (size int) {
 	return size
 }
 
+func (t *SessionToken) Unmarshal(data []byte) error {
+	m := new(session.SessionToken)
+	if err := goproto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*t = *SessionTokenFromGRPCMessage(m)
+
+	return nil
+}
+
 func (r *RequestMetaHeader) StableMarshal(buf []byte) ([]byte, error) {
 	if r == nil {
 		return []byte{}, nil

v2/session/marshal_test.go

@@ -104,16 +104,14 @@ func TestSessionTokenBody_StableMarshal(t *testing.T) {
 
 func TestSessionToken_StableMarshal(t *testing.T) {
 	sessionTokenFrom := generateSessionToken("Session Token")
-	transport := new(grpc.SessionToken)
 
 	t.Run("non empty", func(t *testing.T) {
 		wire, err := sessionTokenFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
-		err = goproto.Unmarshal(wire, transport)
-		require.NoError(t, err)
+		sessionTokenTo := new(session.SessionToken)
+		require.NoError(t, sessionTokenTo.Unmarshal(wire))
 
-		sessionTokenTo := session.SessionTokenFromGRPCMessage(transport)
 		require.Equal(t, sessionTokenFrom, sessionTokenTo)
 	})
 }