[#283] pkg/container: Add session token and signature to Container

Container can be created within a session, and should be signed.

Add `SessionToken` / `SetSessionToken` (`Signature` / `SetSignature`)
methods to carry session token (signature) in `Container` structure.

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

pkg/container/container.go

@@ -7,11 +7,16 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg"
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	"github.com/nspcc-dev/neofs-api-go/v2/container"
 )
 
 type Container struct {
 	v2 container.Container
+
+	token *token.SessionToken
+
+	sig *pkg.Signature
 }
 
 func New(opts ...NewOption) *Container {
@@ -152,6 +157,28 @@ func (c *Container) SetPlacementPolicy(v *netmap.PlacementPolicy) {
 	c.v2.SetPlacementPolicy(v.ToV2())
 }
 
+// SessionToken returns token of the session within
+// which container was created.
+func (c Container) SessionToken() *token.SessionToken {
+	return c.token
+}
+
+// SetSessionToken sets token of the session within
+// which container was created.
+func (c *Container) SetSessionToken(t *token.SessionToken) {
+	c.token = t
+}
+
+// Signature returns signature of the marshaled container.
+func (c Container) Signature() *pkg.Signature {
+	return c.sig
+}
+
+// SetSignature sets signature of the marshaled container.
+func (c *Container) SetSignature(sig *pkg.Signature) {
+	c.sig = sig
+}
+
 // Marshal marshals Container into a protobuf binary form.
 //
 // Buffer is allocated when the argument is empty.

pkg/container/container_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/container"
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	"github.com/nspcc-dev/neofs-crypto/test"
 	"github.com/stretchr/testify/require"
 )
@@ -95,3 +96,25 @@ func TestContainerEncoding(t *testing.T) {
 		require.Equal(t, c, c2)
 	})
 }
+
+func TestContainer_SessionToken(t *testing.T) {
+	tok := token.NewSessionToken()
+	tok.SetID([]byte{1, 2, 3})
+
+	cnr := container.New()
+
+	cnr.SetSessionToken(tok)
+
+	require.Equal(t, tok, cnr.SessionToken())
+}
+
+func TestContainer_Signature(t *testing.T) {
+	sig := pkg.NewSignature()
+	sig.SetKey([]byte{1, 2, 3})
+	sig.SetSign([]byte{4, 5, 6})
+
+	cnr := container.New()
+	cnr.SetSignature(sig)
+
+	require.Equal(t, sig, cnr.Signature())
+}