core: add NotValidBefore transaction attribute

Close #1490

pkg/config/protocol_config.go

@@ -9,6 +9,8 @@ type (
 	ProtocolConfiguration struct {
 		Magic       netmode.Magic `yaml:"Magic"`
 		MemPoolSize int           `yaml:"MemPoolSize"`
+		// P2PSigExtensions enables additional signature-related transaction attributes
+		P2PSigExtensions bool `yaml:"P2PSigExtensions"`
 		// SaveStorageBatch enables storage batch saving before every persist.
 		SaveStorageBatch bool     `yaml:"SaveStorageBatch"`
 		SecondsPerBlock  int      `yaml:"SecondsPerBlock"`

pkg/core/blockchain.go

@@ -1196,6 +1196,7 @@ func (bc *Blockchain) verifyHeader(currHeader, prevHeader *block.Header) error {
 
 // Various errors that could be returned upon verification.
 var (
+	ErrTxNotYetValid       = errors.New("transaction is not yet valid")
 	ErrTxExpired           = errors.New("transaction has expired")
 	ErrInsufficientFunds   = errors.New("insufficient funds")
 	ErrTxSmallNetworkFee   = errors.New("too small network fee")
@@ -1294,6 +1295,14 @@ func (bc *Blockchain) verifyTxAttributes(tx *transaction.Transaction) error {
 			if uint64(tx.NetworkFee+tx.SystemFee) < req.GasForResponse {
 				return fmt.Errorf("%w: oracle tx has insufficient gas", ErrInvalidAttribute)
 			}
+		case transaction.NotValidBeforeT:
+			if !bc.config.P2PSigExtensions {
+				return errors.New("NotValidBefore attribute was found, but P2PSigExtensions are disabled")
+			}
+			nvb := tx.Attributes[i].Value.(*transaction.NotValidBefore)
+			if height := bc.BlockHeight(); height < nvb.Height {
+				return fmt.Errorf("%w: NotValidBefore = %d, current height = %d", ErrTxNotYetValid, nvb.Height, height)
+			}
 		}
 	}
 	return nil

pkg/core/blockchain_test.go

@@ -559,6 +559,44 @@ func TestVerifyTx(t *testing.T) {
 				checkErr(t, ErrInvalidAttribute, tx)
 			})
 		})
+		t.Run("NotValidBefore", func(t *testing.T) {
+			getNVBTx := func(height uint32) *transaction.Transaction {
+				tx := bc.newTestTx(h, testScript)
+				tx.Attributes = append(tx.Attributes, transaction.Attribute{Type: transaction.NotValidBeforeT, Value: &transaction.NotValidBefore{Height: height}})
+				tx.NetworkFee += 4_000_000 // multisig check
+				tx.Signers = []transaction.Signer{{
+					Account: testchain.CommitteeScriptHash(),
+					Scopes:  transaction.None,
+				}}
+				rawScript := testchain.CommitteeVerificationScript()
+				require.NoError(t, err)
+				size := io.GetVarSize(tx)
+				netFee, sizeDelta := fee.Calculate(rawScript)
+				tx.NetworkFee += netFee
+				tx.NetworkFee += int64(size+sizeDelta) * bc.FeePerByte()
+				data := tx.GetSignedPart()
+				tx.Scripts = []transaction.Witness{{
+					InvocationScript:   testchain.SignCommittee(data),
+					VerificationScript: rawScript,
+				}}
+				return tx
+			}
+			t.Run("Disabled", func(t *testing.T) {
+				tx := getNVBTx(bc.blockHeight + 1)
+				require.Error(t, bc.VerifyTx(tx))
+			})
+			t.Run("Enabled", func(t *testing.T) {
+				bc.config.P2PSigExtensions = true
+				t.Run("NotYetValid", func(t *testing.T) {
+					tx := getNVBTx(bc.blockHeight + 1)
+					require.True(t, errors.Is(bc.VerifyTx(tx), ErrTxNotYetValid))
+				})
+				t.Run("positive", func(t *testing.T) {
+					tx := getNVBTx(bc.blockHeight)
+					require.NoError(t, bc.VerifyTx(tx))
+				})
+			})
+		})
 	})
 }
 

pkg/core/transaction/attribute.go

@@ -35,6 +35,9 @@ func (attr *Attribute) DecodeBinary(br *io.BinReader) {
 	case OracleResponseT:
 		attr.Value = new(OracleResponse)
 		attr.Value.DecodeBinary(br)
+	case NotValidBeforeT:
+		attr.Value = new(NotValidBefore)
+		attr.Value.DecodeBinary(br)
 	default:
 		br.Err = fmt.Errorf("failed decoding TX attribute usage: 0x%2x", int(attr.Type))
 		return
@@ -46,7 +49,7 @@ func (attr *Attribute) EncodeBinary(bw *io.BinWriter) {
 	bw.WriteB(byte(attr.Type))
 	switch attr.Type {
 	case HighPriority:
-	case OracleResponseT:
+	case OracleResponseT, NotValidBeforeT:
 		attr.Value.EncodeBinary(bw)
 	default:
 		bw.Err = fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Type)
@@ -78,6 +81,10 @@ func (attr *Attribute) UnmarshalJSON(data []byte) error {
 		// value, we can unmarshal the same data. The overhead is minimal.
 		attr.Value = new(OracleResponse)
 		return json.Unmarshal(data, attr.Value)
+	case "NotValidBefore":
+		attr.Type = NotValidBeforeT
+		attr.Value = new(NotValidBefore)
+		return json.Unmarshal(data, attr.Value)
 	default:
 		return errors.New("wrong Type")
 

pkg/core/transaction/attribute_test.go

@@ -27,6 +27,15 @@ func TestAttribute_EncodeBinary(t *testing.T) {
 		}
 		testserdes.EncodeDecodeBinary(t, attr, new(Attribute))
 	})
+	t.Run("NotValidBefore", func(t *testing.T) {
+		attr := &Attribute{
+			Type: NotValidBeforeT,
+			Value: &NotValidBefore{
+				Height: 123,
+			},
+		}
+		testserdes.EncodeDecodeBinary(t, attr, new(Attribute))
+	})
 }
 
 func TestAttribute_MarshalJSON(t *testing.T) {
@@ -63,4 +72,13 @@ func TestAttribute_MarshalJSON(t *testing.T) {
 		require.Equal(t, attr, actual)
 		testserdes.EncodeDecodeBinary(t, attr, new(Attribute))
 	})
+	t.Run("NotValidBefore", func(t *testing.T) {
+		attr := &Attribute{
+			Type: NotValidBeforeT,
+			Value: &NotValidBefore{
+				Height: 123,
+			},
+		}
+		testserdes.MarshalUnmarshalJSON(t, attr, new(Attribute))
+	})
 }

pkg/core/transaction/attrtype.go

@@ -9,6 +9,7 @@ type AttrType uint8
 const (
 	HighPriority    AttrType = 1
 	OracleResponseT AttrType = 0x11 // OracleResponse
+	NotValidBeforeT AttrType = 0x12 // NotValidBefore
 )
 
 func (a AttrType) allowMultiple() bool {

pkg/core/transaction/not_valid_before.go

@@ -0,0 +1,22 @@
+package transaction
+
+import "github.com/nspcc-dev/neo-go/pkg/io"
+
+// NotValidBefore represents attribute with the height transaction is not valid before.
+type NotValidBefore struct {
+	Height uint32 `json:"height"`
+}
+
+// DecodeBinary implements io.Serializable interface.
+func (n *NotValidBefore) DecodeBinary(br *io.BinReader) {
+	n.Height = br.ReadU32LE()
+}
+
+// EncodeBinary implements io.Serializable interface.
+func (n *NotValidBefore) EncodeBinary(w *io.BinWriter) {
+	w.WriteU32LE(n.Height)
+}
+
+func (n *NotValidBefore) toJSONMap(m map[string]interface{}) {
+	m["height"] = n.Height
+}