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interceptedTransaction.go
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interceptedTransaction.go
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package transaction
import (
"bytes"
"fmt"
"math/big"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data"
"github.com/ElrondNetwork/elrond-go-core/data/transaction"
"github.com/ElrondNetwork/elrond-go-core/hashing"
"github.com/ElrondNetwork/elrond-go-core/marshal"
"github.com/ElrondNetwork/elrond-go-crypto"
logger "github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/sharding"
)
var _ process.TxValidatorHandler = (*InterceptedTransaction)(nil)
var _ process.InterceptedData = (*InterceptedTransaction)(nil)
// InterceptedTransaction holds and manages a transaction based struct with extended functionality
type InterceptedTransaction struct {
tx *transaction.Transaction
protoMarshalizer marshal.Marshalizer
signMarshalizer marshal.Marshalizer
hasher hashing.Hasher
txSignHasher hashing.Hasher
keyGen crypto.KeyGenerator
singleSigner crypto.SingleSigner
pubkeyConv core.PubkeyConverter
coordinator sharding.Coordinator
hash []byte
feeHandler process.FeeHandler
whiteListerVerifiedTxs process.WhiteListHandler
argsParser process.ArgumentsParser
txVersionChecker process.TxVersionCheckerHandler
chainID []byte
rcvShard uint32
sndShard uint32
isForCurrentShard bool
enableSignedTxWithHash bool
}
// NewInterceptedTransaction returns a new instance of InterceptedTransaction
func NewInterceptedTransaction(
txBuff []byte,
protoMarshalizer marshal.Marshalizer,
signMarshalizer marshal.Marshalizer,
hasher hashing.Hasher,
keyGen crypto.KeyGenerator,
signer crypto.SingleSigner,
pubkeyConv core.PubkeyConverter,
coordinator sharding.Coordinator,
feeHandler process.FeeHandler,
whiteListerVerifiedTxs process.WhiteListHandler,
argsParser process.ArgumentsParser,
chainID []byte,
enableSignedTxWithHash bool,
txSignHasher hashing.Hasher,
txVersionChecker process.TxVersionCheckerHandler,
) (*InterceptedTransaction, error) {
if txBuff == nil {
return nil, process.ErrNilBuffer
}
if check.IfNil(protoMarshalizer) {
return nil, process.ErrNilMarshalizer
}
if check.IfNil(signMarshalizer) {
return nil, process.ErrNilMarshalizer
}
if check.IfNil(hasher) {
return nil, process.ErrNilHasher
}
if check.IfNil(keyGen) {
return nil, process.ErrNilKeyGen
}
if check.IfNil(signer) {
return nil, process.ErrNilSingleSigner
}
if check.IfNil(pubkeyConv) {
return nil, process.ErrNilPubkeyConverter
}
if check.IfNil(coordinator) {
return nil, process.ErrNilShardCoordinator
}
if check.IfNil(feeHandler) {
return nil, process.ErrNilEconomicsFeeHandler
}
if check.IfNil(whiteListerVerifiedTxs) {
return nil, process.ErrNilWhiteListHandler
}
if check.IfNil(argsParser) {
return nil, process.ErrNilArgumentParser
}
if len(chainID) == 0 {
return nil, process.ErrInvalidChainID
}
if check.IfNil(txSignHasher) {
return nil, process.ErrNilHasher
}
if check.IfNil(txVersionChecker) {
return nil, process.ErrNilTransactionVersionChecker
}
tx, err := createTx(protoMarshalizer, txBuff)
if err != nil {
return nil, err
}
inTx := &InterceptedTransaction{
tx: tx,
protoMarshalizer: protoMarshalizer,
signMarshalizer: signMarshalizer,
hasher: hasher,
singleSigner: signer,
pubkeyConv: pubkeyConv,
keyGen: keyGen,
coordinator: coordinator,
feeHandler: feeHandler,
whiteListerVerifiedTxs: whiteListerVerifiedTxs,
argsParser: argsParser,
chainID: chainID,
enableSignedTxWithHash: enableSignedTxWithHash,
txVersionChecker: txVersionChecker,
txSignHasher: txSignHasher,
}
err = inTx.processFields(txBuff)
if err != nil {
return nil, err
}
return inTx, nil
}
func createTx(marshalizer marshal.Marshalizer, txBuff []byte) (*transaction.Transaction, error) {
tx := &transaction.Transaction{}
err := marshalizer.Unmarshal(tx, txBuff)
if err != nil {
return nil, err
}
return tx, nil
}
func createRelayedV2(relayedTx *transaction.Transaction, args [][]byte) (*transaction.Transaction, error) {
if len(args) != 4 {
return nil, process.ErrInvalidArguments
}
tx := &transaction.Transaction{
Nonce: big.NewInt(0).SetBytes(args[1]).Uint64(),
Value: big.NewInt(0),
RcvAddr: args[0],
SndAddr: relayedTx.RcvAddr,
GasPrice: relayedTx.GasPrice,
GasLimit: 0, // the user had to sign a transaction with 0 gasLimit - as all gasLimit is coming from the relayer
Data: args[2],
ChainID: relayedTx.ChainID,
Version: relayedTx.Version,
Signature: args[3],
Options: relayedTx.Options,
}
return tx, nil
}
// CheckValidity checks if the received transaction is valid (not nil fields, valid sig and so on)
func (inTx *InterceptedTransaction) CheckValidity() error {
err := inTx.integrity(inTx.tx)
if err != nil {
return err
}
whiteListedVerified := inTx.whiteListerVerifiedTxs.IsWhiteListed(inTx)
if !whiteListedVerified {
err = inTx.verifySig(inTx.tx)
if err != nil {
return err
}
err = inTx.verifyIfRelayedTx(inTx.tx)
if err != nil {
return err
}
err = inTx.verifyIfRelayedTxV2(inTx.tx)
if err != nil {
return err
}
inTx.whiteListerVerifiedTxs.Add([][]byte{inTx.Hash()})
}
return nil
}
func isRelayedTx(funcName string) bool {
return core.RelayedTransaction == funcName || core.RelayedTransactionV2 == funcName
}
func (inTx *InterceptedTransaction) verifyIfRelayedTxV2(tx *transaction.Transaction) error {
funcName, userTxArgs, err := inTx.argsParser.ParseCallData(string(tx.Data))
if err != nil {
return nil
}
if core.RelayedTransactionV2 != funcName {
return nil
}
userTx, err := createRelayedV2(tx, userTxArgs)
if err != nil {
return err
}
err = inTx.verifySig(userTx)
if err != nil {
return err
}
funcName, _, err = inTx.argsParser.ParseCallData(string(userTx.Data))
if err != nil {
return nil
}
// recursive relayed transactions are not allowed
if isRelayedTx(funcName) {
return process.ErrRecursiveRelayedTxIsNotAllowed
}
return nil
}
func (inTx *InterceptedTransaction) verifyIfRelayedTx(tx *transaction.Transaction) error {
funcName, userTxArgs, err := inTx.argsParser.ParseCallData(string(tx.Data))
if err != nil {
return nil
}
if core.RelayedTransaction != funcName {
return nil
}
if len(userTxArgs) != 1 {
return process.ErrInvalidArguments
}
userTx, err := createTx(inTx.signMarshalizer, userTxArgs[0])
if err != nil {
return err
}
if !bytes.Equal(userTx.SndAddr, tx.RcvAddr) {
return process.ErrRelayedTxBeneficiaryDoesNotMatchReceiver
}
err = inTx.integrity(userTx)
if err != nil {
return err
}
err = inTx.verifySig(userTx)
if err != nil {
return err
}
if len(userTx.Data) == 0 {
return nil
}
funcName, _, err = inTx.argsParser.ParseCallData(string(userTx.Data))
if err != nil {
return nil
}
// recursive relayed transactions are not allowed
if isRelayedTx(funcName) {
return process.ErrRecursiveRelayedTxIsNotAllowed
}
return nil
}
func (inTx *InterceptedTransaction) processFields(txBuff []byte) error {
inTx.hash = inTx.hasher.Compute(string(txBuff))
inTx.sndShard = inTx.coordinator.ComputeId(inTx.tx.SndAddr)
emptyAddr := make([]byte, len(inTx.tx.RcvAddr))
inTx.rcvShard = inTx.coordinator.ComputeId(inTx.tx.RcvAddr)
if bytes.Equal(inTx.tx.RcvAddr, emptyAddr) {
inTx.rcvShard = inTx.sndShard
}
isForCurrentShardRecv := inTx.rcvShard == inTx.coordinator.SelfId()
isForCurrentShardSender := inTx.sndShard == inTx.coordinator.SelfId()
inTx.isForCurrentShard = isForCurrentShardRecv || isForCurrentShardSender
return nil
}
// integrity checks for not nil fields and negative value
func (inTx *InterceptedTransaction) integrity(tx *transaction.Transaction) error {
err := inTx.txVersionChecker.CheckTxVersion(tx)
if err != nil {
return err
}
err = tx.CheckIntegrity()
if err != nil {
return err
}
if !bytes.Equal(tx.ChainID, inTx.chainID) {
return process.ErrInvalidChainID
}
if len(tx.RcvAddr) != inTx.pubkeyConv.Len() {
return process.ErrInvalidRcvAddr
}
if len(tx.SndAddr) != inTx.pubkeyConv.Len() {
return process.ErrInvalidSndAddr
}
return inTx.feeHandler.CheckValidityTxValues(tx)
}
// verifySig checks if the tx is correctly signed
func (inTx *InterceptedTransaction) verifySig(tx *transaction.Transaction) error {
buffCopiedTx, err := tx.GetDataForSigning(inTx.pubkeyConv, inTx.signMarshalizer)
if err != nil {
return err
}
senderPubKey, err := inTx.keyGen.PublicKeyFromByteArray(tx.SndAddr)
if err != nil {
return err
}
if !inTx.txVersionChecker.IsSignedWithHash(tx) {
return inTx.singleSigner.Verify(senderPubKey, buffCopiedTx, tx.Signature)
}
if !inTx.enableSignedTxWithHash {
return process.ErrTransactionSignedWithHashIsNotEnabled
}
txHash := inTx.txSignHasher.Compute(string(buffCopiedTx))
return inTx.singleSigner.Verify(senderPubKey, txHash, tx.Signature)
}
// ReceiverShardId returns the receiver shard id
func (inTx *InterceptedTransaction) ReceiverShardId() uint32 {
return inTx.rcvShard
}
// IsForCurrentShard returns true if this transaction is meant to be processed by the node from this shard
func (inTx *InterceptedTransaction) IsForCurrentShard() bool {
return inTx.isForCurrentShard
}
// Transaction returns the transaction pointer that actually holds the data
func (inTx *InterceptedTransaction) Transaction() data.TransactionHandler {
return inTx.tx
}
// Hash gets the hash of this transaction
func (inTx *InterceptedTransaction) Hash() []byte {
return inTx.hash
}
// SenderShardId returns the transaction sender shard id
func (inTx *InterceptedTransaction) SenderShardId() uint32 {
return inTx.sndShard
}
// Nonce returns the transaction nonce
func (inTx *InterceptedTransaction) Nonce() uint64 {
return inTx.tx.Nonce
}
// SenderAddress returns the transaction sender address
func (inTx *InterceptedTransaction) SenderAddress() []byte {
return inTx.tx.SndAddr
}
// Fee returns the estimated cost of the transaction
func (inTx *InterceptedTransaction) Fee() *big.Int {
return inTx.feeHandler.ComputeTxFee(inTx.tx)
}
// Type returns the type of this intercepted data
func (inTx *InterceptedTransaction) Type() string {
return "intercepted tx"
}
// String returns the transaction's most important fields as string
func (inTx *InterceptedTransaction) String() string {
return fmt.Sprintf("sender=%s, nonce=%d, value=%s, recv=%s",
logger.DisplayByteSlice(inTx.tx.SndAddr),
inTx.tx.Nonce,
inTx.tx.Value.String(),
logger.DisplayByteSlice(inTx.tx.RcvAddr),
)
}
// Identifiers returns the identifiers used in requests
func (inTx *InterceptedTransaction) Identifiers() [][]byte {
return [][]byte{inTx.hash}
}
// IsInterfaceNil returns true if there is no value under the interface
func (inTx *InterceptedTransaction) IsInterfaceNil() bool {
return inTx == nil
}