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package types
import (
"crypto/ecdsa"
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rlp"
)
func IsContractAddr(addr []byte) bool {
return len(addr) == 0
}
type Transaction struct {
AccountNonce uint64
Price *big.Int
GasLimit *big.Int
Recipient *common.Address // nil means contract creation
Amount *big.Int
Payload []byte
V byte
R, S *big.Int
}
func NewContractCreationTx(amount, gasLimit, gasPrice *big.Int, data []byte) *Transaction {
return &Transaction{
Recipient: nil,
Amount: amount,
GasLimit: gasLimit,
Price: gasPrice,
Payload: data,
R: new(big.Int),
S: new(big.Int),
}
}
func NewTransactionMessage(to common.Address, amount, gasAmount, gasPrice *big.Int, data []byte) *Transaction {
return &Transaction{
Recipient: &to,
Amount: amount,
GasLimit: gasAmount,
Price: gasPrice,
Payload: data,
R: new(big.Int),
S: new(big.Int),
}
}
func NewTransactionFromBytes(data []byte) *Transaction {
// TODO: remove this function if possible. callers would
// much better off decoding into transaction directly.
// it's not that hard.
tx := new(Transaction)
rlp.DecodeBytes(data, tx)
return tx
}
func (tx *Transaction) Hash() common.Hash {
return rlpHash([]interface{}{
tx.AccountNonce, tx.Price, tx.GasLimit, tx.Recipient, tx.Amount, tx.Payload,
})
}
func (self *Transaction) Data() []byte {
return self.Payload
}
func (self *Transaction) Gas() *big.Int {
return self.GasLimit
}
func (self *Transaction) GasPrice() *big.Int {
return self.Price
}
func (self *Transaction) Value() *big.Int {
return self.Amount
}
func (self *Transaction) Nonce() uint64 {
return self.AccountNonce
}
func (self *Transaction) SetNonce(AccountNonce uint64) {
self.AccountNonce = AccountNonce
}
func (self *Transaction) From() (common.Address, error) {
pubkey := self.PublicKey()
if len(pubkey) == 0 || pubkey[0] != 4 {
return common.Address{}, errors.New("invalid public key")
}
var addr common.Address
copy(addr[:], crypto.Sha3(pubkey[1:])[12:])
return addr, nil
}
// To returns the recipient of the transaction.
// If transaction is a contract creation (with no recipient address)
// To returns nil.
func (tx *Transaction) To() *common.Address {
return tx.Recipient
}
func (tx *Transaction) Curve() (v byte, r []byte, s []byte) {
v = byte(tx.V)
r = common.LeftPadBytes(tx.R.Bytes(), 32)
s = common.LeftPadBytes(tx.S.Bytes(), 32)
return
}
func (tx *Transaction) Signature(key []byte) []byte {
hash := tx.Hash()
sig, _ := secp256k1.Sign(hash[:], key)
return sig
}
func (tx *Transaction) PublicKey() []byte {
hash := tx.Hash()
v, r, s := tx.Curve()
sig := append(r, s...)
sig = append(sig, v-27)
//pubkey := crypto.Ecrecover(append(hash[:], sig...))
//pubkey, _ := secp256k1.RecoverPubkey(hash[:], sig)
p, err := crypto.SigToPub(hash[:], sig)
if err != nil {
glog.V(logger.Error).Infof("Could not get pubkey from signature: ", err)
return nil
}
pubkey := crypto.FromECDSAPub(p)
return pubkey
}
func (tx *Transaction) SetSignatureValues(sig []byte) error {
tx.R = common.Bytes2Big(sig[:32])
tx.S = common.Bytes2Big(sig[32:64])
tx.V = sig[64] + 27
return nil
}
func (tx *Transaction) SignECDSA(prv *ecdsa.PrivateKey) error {
h := tx.Hash()
sig, err := crypto.Sign(h[:], prv)
if err != nil {
return err
}
tx.SetSignatureValues(sig)
return nil
}
// TODO: remove
func (tx *Transaction) RlpData() interface{} {
data := []interface{}{tx.AccountNonce, tx.Price, tx.GasLimit, tx.Recipient, tx.Amount, tx.Payload}
return append(data, tx.V, tx.R.Bytes(), tx.S.Bytes())
}
func (tx *Transaction) String() string {
var from, to string
if f, err := tx.From(); err != nil {
from = "[invalid sender]"
} else {
from = fmt.Sprintf("%x", f[:])
}
if t := tx.To(); t == nil {
to = "[contract creation]"
} else {
to = fmt.Sprintf("%x", t[:])
}
enc, _ := rlp.EncodeToBytes(tx)
return fmt.Sprintf(`
TX(%x)
Contract: %v
From: %s
To: %s
Nonce: %v
GasPrice: %v
GasLimit %v
Value: %v
Data: 0x%x
V: 0x%x
R: 0x%x
S: 0x%x
Hex: %x
`,
tx.Hash(),
len(tx.Recipient) == 0,
from,
to,
tx.AccountNonce,
tx.Price,
tx.GasLimit,
tx.Amount,
tx.Payload,
tx.V,
tx.R,
tx.S,
enc,
)
}
// Transaction slice type for basic sorting
type Transactions []*Transaction
// TODO: remove
func (self Transactions) RlpData() interface{} {
// Marshal the transactions of this block
enc := make([]interface{}, len(self))
for i, tx := range self {
// Cast it to a string (safe)
enc[i] = tx.RlpData()
}
return enc
}
func (s Transactions) Len() int { return len(s) }
func (s Transactions) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s Transactions) GetRlp(i int) []byte {
enc, _ := rlp.EncodeToBytes(s[i])
return enc
}
type TxByNonce struct{ Transactions }
func (s TxByNonce) Less(i, j int) bool {
return s.Transactions[i].AccountNonce < s.Transactions[j].AccountNonce
}
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