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

Extended ACL table can be set within a session, and should be signed.

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

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

pkg/acl/eacl/table.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/nspcc-dev/neofs-api-go/pkg"
 	cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
+	"github.com/nspcc-dev/neofs-api-go/pkg/session"
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 )
 
@@ -14,6 +15,8 @@ import (
 type Table struct {
 	version pkg.Version
 	cid     *cid.ID
+	token   *session.Token
+	sig     *pkg.Signature
 	records []*Record
 }
 
@@ -49,6 +52,28 @@ func (t *Table) AddRecord(r *Record) {
 	}
 }
 
+// SessionToken returns token of the session
+// within which Table was set.
+func (t Table) SessionToken() *session.Token {
+	return t.token
+}
+
+// SetSessionToken sets token of the session
+// within which Table was set.
+func (t *Table) SetSessionToken(tok *session.Token) {
+	t.token = tok
+}
+
+// Signature returns Table signature.
+func (t Table) Signature() *pkg.Signature {
+	return t.sig
+}
+
+// SetSignature sets Table signature.
+func (t *Table) SetSignature(sig *pkg.Signature) {
+	t.sig = sig
+}
+
 // ToV2 converts Table to v2 acl.EACLTable message.
 func (t *Table) ToV2() *v2acl.Table {
 	v2 := new(v2acl.Table)

pkg/acl/eacl/table_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg"
 	"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
 	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	sessiontest "github.com/nspcc-dev/neofs-api-go/pkg/session/test"
 	"github.com/stretchr/testify/require"
 )
 
@@ -91,3 +92,23 @@ func TestRecordEncoding(t *testing.T) {
 		require.Equal(t, tab, r2)
 	})
 }
+
+func TestTable_SessionToken(t *testing.T) {
+	tok := sessiontest.Generate()
+
+	table := eacl.NewTable()
+	table.SetSessionToken(tok)
+
+	require.Equal(t, tok, table.SessionToken())
+}
+
+func TestTable_Signature(t *testing.T) {
+	sig := pkg.NewSignature()
+	sig.SetKey([]byte{1, 2, 3})
+	sig.SetSign([]byte{4, 5, 6})
+
+	table := eacl.NewTable()
+	table.SetSignature(sig)
+
+	require.Equal(t, sig, table.Signature())
+}