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package outscript
import (
"crypto"
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"math/big"
"strconv"
"github.com/BottleFmt/gobottle"
"github.com/KarpelesLab/rlp"
"github.com/KarpelesLab/secp256k1"
"github.com/KarpelesLab/typutil"
"golang.org/x/crypto/sha3"
)
// LegacyTx
// DynamicFeeTx represents an EIP-1559 transaction
// AccessListTx is the data of EIP-2930 access list transactions; access lists
// (the [address, [storageKeys...]] tuples) are encoded/decoded for EIP-2930,
// EIP-1559 and EIP-7702 transactions.
//
// Legacy = rlp([nonce, gasPrice, gasLimit, to, value, data, v, r, s])
// EIP-2930 = 0x01 || rlp([chainId, nonce, gasPrice, gasLimit, to, value, data, accessList, signatureYParity, signatureR, signatureS])
// EIP-1559 = 0x02 || rlp([chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, destination, amount, data, access_list, signature_y_parity, signature_r, signature_s])
// EIP-4844 = 0x03 || [chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, to, value, data, access_list, max_fee_per_blob_gas, blob_versioned_hashes, y_parity, r, s]
// EIP-7702 = 0x04 || rlp([chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, destination, value, data, access_list, authorization_list, signature_y_parity, signature_r, signature_s])
// where authorization_list = [[chain_id, address, nonce, y_parity, r, s], ...] and each tuple is signed over keccak256(0x05 || rlp([chain_id, address, nonce]))
// however, EIP-2930 is so rare we can probably forget about it
// EvmTxType represents the type of EVM transaction encoding.
type EvmTxType int
const (
EvmTxLegacy EvmTxType = iota // Legacy (pre-EIP-2718) transaction
EvmTxEIP2930 // EIP-2930 access list transaction
EvmTxEIP1559 // EIP-1559 dynamic fee transaction
EvmTxEIP4844 // EIP-4844 blob transaction
EvmTxEIP7702 // EIP-7702 set-code (authorization list) transaction
)
// EvmTx represents an Ethereum Virtual Machine transaction. It supports legacy,
// EIP-2930, EIP-1559, EIP-4844, and EIP-7702 transaction types, and can be signed,
// serialized, parsed, and converted to/from JSON.
type EvmTx struct {
Nonce uint64
GasTipCap *big.Int // a.k.a. maxPriorityFeePerGas
GasFeeCap *big.Int // a.k.a. maxFeePerGas, correspond to GasFee if tx type is legacy or eip2930
Gas uint64 // gas of tx, can be obtained with eth_estimateGas, 21000 if Data is empty
To string
Value *big.Int
Data []byte
ChainId uint64 // in legacy tx, chainId is encoded in v before signature
Type EvmTxType // type of transaction: legacy, eip2930 or eip1559
AccessList []*EvmAccessTuple // EIP-2930 access list (EIP-2930, EIP-1559, EIP-7702)
AuthList []*EvmAuthorization // EIP-7702 authorization list (type EvmTxEIP7702)
Signed bool
Y, R, S *big.Int
}
// evmTxJson is used when encoding/decoding evmTx into json
type evmTxJson struct {
From string `json:"from,omitempty"` // not used when reading but useful for debug
Gas string `json:"gas"`
GasPrice string `json:"gasPrice,omitempty"`
GasTipCap string `json:"maxPriorityFeePerGas,omitempty"`
GasFeeCap string `json:"maxFeePerGas,omitempty"`
Hash string `json:"hash,omitempty"`
Input string `json:"input"`
Nonce string `json:"nonce"`
To string `json:"to,omitempty"`
Value string `json:"value"`
ChainId string `json:"chainId"`
V string `json:"v"`
R string `json:"r"`
S string `json:"s"`
AccessList []*evmAccessTupleJson `json:"accessList,omitempty"`
AuthorizationList []*evmAuthorizationJson `json:"authorizationList,omitempty"`
}
// RlpFields returns the Rlp fields for the given transaction, less the signature fields
func (tx *EvmTx) RlpFields() []any {
switch tx.Type {
case EvmTxLegacy:
return []any{
tx.Nonce,
tx.GasFeeCap,
tx.Gas,
tx.To,
tx.Value,
tx.Data,
}
case EvmTxEIP2930:
return []any{
tx.ChainId,
tx.Nonce,
tx.GasFeeCap,
tx.Gas,
tx.To,
tx.Value,
tx.Data,
tx.accessListRlp(),
}
case EvmTxEIP1559:
return []any{
tx.ChainId,
tx.Nonce,
tx.GasTipCap,
tx.GasFeeCap,
tx.Gas,
tx.To,
tx.Value,
tx.Data,
tx.accessListRlp(),
}
case EvmTxEIP7702:
return []any{
tx.ChainId,
tx.Nonce,
tx.GasTipCap,
tx.GasFeeCap,
tx.Gas,
tx.To,
tx.Value,
tx.Data,
tx.accessListRlp(),
tx.authorizationListRlp(),
}
default:
return nil
}
}
func (tx *EvmTx) typeValue() byte {
switch tx.Type {
case EvmTxLegacy:
return 0
case EvmTxEIP2930:
return 1
case EvmTxEIP1559:
return 2
case EvmTxEIP4844:
return 3
case EvmTxEIP7702:
return 4
default:
return 0xff // :(
}
}
// MarshalBinary transforms the transaction into its binary representation
func (tx *EvmTx) MarshalBinary() ([]byte, error) {
if !tx.Signed {
return tx.SignBytes()
}
switch tx.Type {
case EvmTxLegacy:
f := tx.RlpFields()
f = append(f, tx.Y, tx.R, tx.S)
return rlp.EncodeValue(f)
default:
f := tx.RlpFields()
f = append(f, tx.Y, tx.R, tx.S)
buf, err := rlp.EncodeValue(f)
if err != nil {
return nil, err
}
return append([]byte{tx.typeValue()}, buf...), nil
}
}
// SignBytes returns the bytes used to sign the transaction
func (tx *EvmTx) SignBytes() ([]byte, error) {
switch tx.Type {
case EvmTxLegacy:
f := tx.RlpFields()
if tx.ChainId != 0 {
// if ChainId == 0, we assume no EIP-155
f = append(f, tx.ChainId, 0, 0)
}
return rlp.EncodeValue(f)
default:
buf, err := rlp.EncodeValue(tx.RlpFields())
if err != nil {
return nil, err
}
return append([]byte{tx.typeValue()}, buf...), nil
}
}
// UnmarshalBinary implements encoding.BinaryUnmarshaler
func (tx *EvmTx) UnmarshalBinary(buf []byte) error {
return tx.ParseTransaction(buf)
}
// decodeUint64Checked safely decodes an RLP uint64 field, returning an error if
// the field is longer than 8 bytes (rlp.DecodeUint64 would otherwise panic).
func decodeUint64Checked(buf []byte) (uint64, error) {
if len(buf) > 8 {
return 0, fmt.Errorf("invalid uint64 field: length %d exceeds 8 bytes", len(buf))
}
return rlp.DecodeUint64(buf), nil
}
// asBytes extracts a []byte from an RLP-decoded value, returning an error on
// type mismatch instead of panicking.
func asBytes(v any) ([]byte, error) {
b, ok := v.([]byte)
if !ok {
return nil, fmt.Errorf("expected rlp string (bytes), got %T", v)
}
return b, nil
}
// asList extracts a []any (RLP list) from an RLP-decoded value, returning an
// error on type mismatch instead of panicking.
func asList(v any) ([]any, error) {
l, ok := v.([]any)
if !ok {
return nil, fmt.Errorf("expected rlp list, got %T", v)
}
return l, nil
}
// ParseTransaction will parse an incoming transaction and return an error in case of failure.
// In case of error, the state of tx is undefined.
func (tx *EvmTx) ParseTransaction(buf []byte) error {
if len(buf) < 1 {
return io.ErrUnexpectedEOF
}
if buf[0] >= 0x80 {
// legacy transaction as per https://eips.ethereum.org/EIPS/eip-2718
dec, err := rlp.Decode(buf)
if err != nil {
return err
}
if len(dec) != 1 {
return errors.New("invalid rlp data for legacy transaction")
}
txData, err := typutil.As[[][]byte](dec[0])
if err != nil {
return fmt.Errorf("failed to decode rlp data: %w", err)
}
ln := len(txData)
if ln != 6 && ln != 9 {
return fmt.Errorf("lgacy transaction must have 6 or 9 fields, got %d", ln)
}
tx.Type = EvmTxLegacy
if tx.Nonce, err = decodeUint64Checked(txData[0]); err != nil {
return err
}
tx.GasFeeCap = new(big.Int).SetBytes(txData[1])
if tx.Gas, err = decodeUint64Checked(txData[2]); err != nil {
return err
}
tx.To = "0x" + hex.EncodeToString(txData[3])
tx.Value = new(big.Int).SetBytes(txData[4])
tx.Data = txData[5]
if ln == 9 {
// signed
tx.Signed = true
tx.Y = new(big.Int).SetBytes(txData[6]) // 27|28, or ChainId * 2 + 35 + (v & 1) if EIP-155
tx.R = new(big.Int).SetBytes(txData[7])
tx.S = new(big.Int).SetBytes(txData[8])
} else {
tx.Signed = false
}
return nil
}
switch buf[0] {
case 1: // EvmTxEIP2930
dec, err := rlp.Decode(buf[1:])
if err != nil {
return err
}
if len(dec) != 1 {
return errors.New("invalid rlp data for legacy transaction")
}
txData, err := asList(dec[0])
if err != nil {
return err
}
ln := len(txData)
if ln != 8 && ln != 11 {
return fmt.Errorf("EIP-2930 transaction must have 8 or 11 fields, got %d", ln)
}
fields := make([][]byte, 7)
for i := 0; i < 7; i++ {
if fields[i], err = asBytes(txData[i]); err != nil {
return err
}
}
tx.Type = EvmTxEIP2930
if tx.ChainId, err = decodeUint64Checked(fields[0]); err != nil {
return err
}
if tx.Nonce, err = decodeUint64Checked(fields[1]); err != nil {
return err
}
tx.GasFeeCap = new(big.Int).SetBytes(fields[2])
if tx.Gas, err = decodeUint64Checked(fields[3]); err != nil {
return err
}
tx.To = "0x" + hex.EncodeToString(fields[4])
tx.Value = new(big.Int).SetBytes(fields[5])
tx.Data = fields[6]
if tx.AccessList, err = parseAccessList(txData[7]); err != nil {
return err
}
if ln == 11 {
tx.Signed = true
y, err := asBytes(txData[8])
if err != nil {
return err
}
r, err := asBytes(txData[9])
if err != nil {
return err
}
s, err := asBytes(txData[10])
if err != nil {
return err
}
tx.Y = new(big.Int).SetBytes(y)
tx.R = new(big.Int).SetBytes(r)
tx.S = new(big.Int).SetBytes(s)
} else {
tx.Signed = false
}
return nil
case 2: // EvmTxEIP1559
dec, err := rlp.Decode(buf[1:])
if err != nil {
return err
}
if len(dec) != 1 {
return errors.New("invalid rlp data for legacy transaction")
}
txData, err := asList(dec[0])
if err != nil {
return err
}
ln := len(txData)
if ln != 9 && ln != 12 {
return fmt.Errorf("EIP-1559 transaction must have 9 or 12 fields, got %d", ln)
}
fields := make([][]byte, 8)
for i := 0; i < 8; i++ {
if fields[i], err = asBytes(txData[i]); err != nil {
return err
}
}
tx.Type = EvmTxEIP1559
if tx.ChainId, err = decodeUint64Checked(fields[0]); err != nil {
return err
}
if tx.Nonce, err = decodeUint64Checked(fields[1]); err != nil {
return err
}
tx.GasTipCap = new(big.Int).SetBytes(fields[2])
tx.GasFeeCap = new(big.Int).SetBytes(fields[3])
if tx.Gas, err = decodeUint64Checked(fields[4]); err != nil {
return err
}
tx.To = "0x" + hex.EncodeToString(fields[5])
tx.Value = new(big.Int).SetBytes(fields[6])
tx.Data = fields[7]
if tx.AccessList, err = parseAccessList(txData[8]); err != nil {
return err
}
if ln == 12 {
tx.Signed = true
y, err := asBytes(txData[9])
if err != nil {
return err
}
r, err := asBytes(txData[10])
if err != nil {
return err
}
s, err := asBytes(txData[11])
if err != nil {
return err
}
tx.Y = new(big.Int).SetBytes(y)
tx.R = new(big.Int).SetBytes(r)
tx.S = new(big.Int).SetBytes(s)
} else {
tx.Signed = false
}
return nil
case 4: // EvmTxEIP7702
dec, err := rlp.Decode(buf[1:])
if err != nil {
return err
}
if len(dec) != 1 {
return errors.New("invalid rlp data for EIP-7702 transaction")
}
txData, err := asList(dec[0])
if err != nil {
return err
}
ln := len(txData)
if ln != 10 && ln != 13 {
return fmt.Errorf("EIP-7702 transaction must have 10 or 13 fields, got %d", ln)
}
fields := make([][]byte, 8)
for i := 0; i < 8; i++ {
if fields[i], err = asBytes(txData[i]); err != nil {
return err
}
}
tx.Type = EvmTxEIP7702
if tx.ChainId, err = decodeUint64Checked(fields[0]); err != nil {
return err
}
if tx.Nonce, err = decodeUint64Checked(fields[1]); err != nil {
return err
}
tx.GasTipCap = new(big.Int).SetBytes(fields[2])
tx.GasFeeCap = new(big.Int).SetBytes(fields[3])
if tx.Gas, err = decodeUint64Checked(fields[4]); err != nil {
return err
}
tx.To = "0x" + hex.EncodeToString(fields[5])
tx.Value = new(big.Int).SetBytes(fields[6])
tx.Data = fields[7]
if tx.AccessList, err = parseAccessList(txData[8]); err != nil {
return err
}
if tx.AuthList, err = parseAuthorizationList(txData[9]); err != nil {
return err
}
if ln == 13 {
tx.Signed = true
y, err := asBytes(txData[10])
if err != nil {
return err
}
r, err := asBytes(txData[11])
if err != nil {
return err
}
s, err := asBytes(txData[12])
if err != nil {
return err
}
tx.Y = new(big.Int).SetBytes(y)
tx.R = new(big.Int).SetBytes(r)
tx.S = new(big.Int).SetBytes(s)
} else {
tx.Signed = false
}
return nil
}
return errors.New("not supported")
}
// Signature returns the parsed secp256k1 signature from the signed transaction.
func (tx *EvmTx) Signature() (*secp256k1.Signature, error) {
if !tx.Signed {
return nil, errors.New("cannot obtain signature of an unsigned transaction")
}
r := new(secp256k1.ModNScalar)
if overflow := r.SetByteSlice(tx.R.Bytes()); overflow {
return nil, errors.New("cannot read signature: invalid value for R >= group order")
}
s := new(secp256k1.ModNScalar)
if overflow := s.SetByteSlice(tx.S.Bytes()); overflow {
return nil, errors.New("cannot read signature: invalid value for S >= group order")
}
v := tx.Y.Uint64()
if tx.Type == EvmTxLegacy {
if v >= 35 {
// EIP-155: v = ChainId * 2 + 35 + (v & 1)
bit := 1 - (v & 1)
v -= 35 + bit
tx.ChainId = v / 2
v = bit
} else {
// pre-EIP-155 legacy tx: v is the recovery id directly.
// Standard values are 27/28 (and some implementations may use
// the raw 0/1 recovery id). Normalize to a [0,3] recovery code
// so we never feed an out-of-range value to secp256k1 (which
// would panic).
tx.ChainId = 0
switch v {
case 27, 28:
v -= 27
case 0, 1:
// already a recovery id
default:
return nil, fmt.Errorf("invalid pre-EIP-155 signature v value: %d", v)
}
}
}
if v > 3 {
return nil, fmt.Errorf("invalid signature recovery id: %d", v)
}
return secp256k1.NewSignatureWithRecoveryCode(r, s, byte(v)), nil
}
// SenderPubkey recovers the sender's public key from the transaction signature.
func (tx *EvmTx) SenderPubkey() (*secp256k1.PublicKey, error) {
if !tx.Signed {
return nil, errors.New("cannot obtain signature of an unsigned transaction")
}
sig, err := tx.Signature()
if err != nil {
return nil, err
}
// RecoverCompact expects a signature inform V,R,S
buf, err := tx.SignBytes()
if err != nil {
return nil, err
}
pub, err := sig.RecoverPublicKey(gobottle.Hash(buf, sha3.NewLegacyKeccak256))
if err != nil {
return nil, err
}
return pub, nil
}
// SenderAddress recovers and returns the EIP-55 checksummed sender address from the transaction signature.
func (tx *EvmTx) SenderAddress() (string, error) {
pubkey, err := tx.SenderPubkey()
if err != nil {
return "", err
}
addr, err := New(pubkey).Generate("eth")
if err != nil {
return "", err
}
return eip55(addr), nil
}
// Sign signs the transaction using the given key with default signer options.
func (tx *EvmTx) Sign(key crypto.Signer) error {
return tx.SignWithOptions(key, crypto.Hash(0))
}
// SignWithOptions signs the transaction using the given key and signer options.
func (tx *EvmTx) SignWithOptions(key crypto.Signer, opts crypto.SignerOpts) error {
buf, err := tx.SignBytes()
if err != nil {
return err
}
h := gobottle.Hash(buf, sha3.NewLegacyKeccak256)
sig, err := key.Sign(rand.Reader, h, opts)
if err != nil {
return err
}
// expect sig to be in DER format
sigO, err := secp256k1.ParseDERSignature(sig)
if err != nil {
return err
}
// find recovery bit
pub, ok := key.Public().(*secp256k1.PublicKey)
if !ok {
return fmt.Errorf("signing key public part must be a secp256k1 public key, got %T", key.Public())
}
if !sigO.BruteforceRecoveryCode(h, pub) {
return errors.New("failed to determine signature recovery code")
}
// apply signature
tx.Signed = true
var v byte
tx.R, tx.S, v = sigO.Export()
if tx.Type == EvmTxLegacy {
if tx.ChainId == 0 {
// super-legacy
tx.Y = big.NewInt(27 + int64(v))
} else {
// EIP-155: v = ChainId * 2 + 35 + (v & 1)
tx.Y = big.NewInt(int64(tx.ChainId)*2 + 35 + int64(v))
}
} else {
tx.Y = big.NewInt(int64(v))
}
return nil
}
// Hash returns the Keccak-256 hash of the signed transaction's binary encoding.
func (tx *EvmTx) Hash() ([]byte, error) {
data, err := tx.MarshalBinary()
if err != nil {
return nil, err
}
return gobottle.Hash(data, sha3.NewLegacyKeccak256), nil
}
// MarshalJSON encodes the transaction as a JSON object with hex-encoded numeric fields.
func (tx *EvmTx) MarshalJSON() ([]byte, error) {
obj := &evmTxJson{
Gas: "0x" + strconv.FormatUint(tx.Gas, 16),
Input: "0x" + hex.EncodeToString(tx.Data),
Nonce: "0x" + strconv.FormatUint(tx.Nonce, 16),
To: tx.To,
Value: "0x" + tx.Value.Text(16),
ChainId: "0x" + strconv.FormatUint(tx.ChainId, 16),
}
if tx.Type == EvmTxLegacy {
obj.GasPrice = "0x" + tx.GasFeeCap.Text(16)
} else {
obj.GasFeeCap = "0x" + tx.GasFeeCap.Text(16)
obj.GasTipCap = "0x" + tx.GasTipCap.Text(16)
}
if len(tx.AccessList) > 0 {
obj.AccessList = make([]*evmAccessTupleJson, len(tx.AccessList))
for i, t := range tx.AccessList {
obj.AccessList[i] = t.toJson()
}
}
if len(tx.AuthList) > 0 {
obj.AuthorizationList = make([]*evmAuthorizationJson, len(tx.AuthList))
for i, a := range tx.AuthList {
obj.AuthorizationList[i] = a.toJson()
}
}
if tx.Signed {
obj.From, _ = tx.SenderAddress()
obj.V = "0x" + tx.Y.Text(16)
obj.R = "0x" + tx.R.Text(16)
obj.S = "0x" + tx.S.Text(16)
//obj.Hash = gobottle.Hash(tx.????, sha3.NewLegacyKeccak256)
}
return json.Marshal(obj)
}
// UnmarshalJSON decodes a JSON representation into an EvmTx.
func (tx *EvmTx) UnmarshalJSON(b []byte) error {
var obj *evmTxJson
var ok bool
err := json.Unmarshal(b, &obj)
if err != nil {
return err
}
if obj.Gas != "" {
tx.Gas, err = strconv.ParseUint(obj.Gas, 0, 64)
if err != nil {
return err
}
}
if obj.GasFeeCap != "" && obj.GasTipCap != "" {
// EIP-1559
tx.GasFeeCap, ok = new(big.Int).SetString(obj.GasFeeCap, 0)
if !ok {
return errors.New("invalid value in gasPrice")
}
tx.GasTipCap, ok = new(big.Int).SetString(obj.GasTipCap, 0)
if !ok {
return errors.New("invalid value in gasPrice")
}
tx.Type = EvmTxEIP1559
} else if obj.GasPrice != "" {
tx.GasFeeCap, ok = new(big.Int).SetString(obj.GasPrice, 0)
if !ok {
return errors.New("invalid value in gasPrice")
}
}
if obj.Input != "" {
tx.Data, err = parseEthBufferHex(obj.Input)
if err != nil {
return err
}
}
if obj.Nonce != "" {
tx.Nonce, err = strconv.ParseUint(obj.Nonce, 0, 64)
if err != nil {
return err
}
}
if obj.To != "" {
tx.To = obj.To
}
if obj.Value != "" {
tx.Value, ok = new(big.Int).SetString(obj.Value, 0)
if !ok {
return errors.New("invalid value in value")
}
}
if obj.ChainId != "" {
tx.ChainId, err = strconv.ParseUint(obj.ChainId, 0, 64)
if err != nil {
return err
}
}
if obj.V != "" {
tx.Y, ok = new(big.Int).SetString(obj.V, 0)
if !ok {
return errors.New("invalid value in v")
}
}
if obj.R != "" {
tx.R, ok = new(big.Int).SetString(obj.R, 0)
if !ok {
return errors.New("invalid value in r")
}
}
if obj.S != "" {
tx.S, ok = new(big.Int).SetString(obj.S, 0)
if !ok {
return errors.New("invalid value in s")
}
}
if len(obj.AccessList) > 0 {
tx.AccessList = make([]*EvmAccessTuple, len(obj.AccessList))
for i, ja := range obj.AccessList {
tx.AccessList[i] = ja.toAccessTuple()
}
}
if len(obj.AuthorizationList) > 0 {
tx.AuthList = make([]*EvmAuthorization, len(obj.AuthorizationList))
for i, ja := range obj.AuthorizationList {
if tx.AuthList[i], err = ja.toAuthorization(); err != nil {
return err
}
}
tx.Type = EvmTxEIP7702
}
if tx.Y != nil && tx.R != nil && tx.S != nil {
tx.Signed = true
}
return nil
}
func parseEthBufferHex(buf string) ([]byte, error) {
if len(buf) < 2 {
return nil, errors.New("eth buffer must start with 0x")
}
return hex.DecodeString(buf[2:])
}
// Call sets the transaction's Data field to the ABI-encoded method call for the given
// method signature and parameters.
func (tx *EvmTx) Call(method string, params ...any) error {
res, err := EvmCall(method, params...)
if err != nil {
return err
}
tx.Data = res
return nil
}
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