package types
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/obscuren/secp256k1-go"
)
func IsContractAddr(addr []byte) bool {
return len(addr) == 0
}
type Transaction struct {
nonce uint64
recipient []byte
value *big.Int
gas *big.Int
gasPrice *big.Int
data []byte
v byte
r, s []byte
}
func NewContractCreationTx(value, gas, gasPrice *big.Int, script []byte) *Transaction {
return &Transaction{recipient: nil, value: value, gas: gas, gasPrice: gasPrice, data: script}
}
func NewTransactionMessage(to []byte, value, gas, gasPrice *big.Int, data []byte) *Transaction {
return &Transaction{recipient: to, value: value, gasPrice: gasPrice, gas: gas, data: data}
}
func NewTransactionFromBytes(data []byte) *Transaction {
tx := &Transaction{}
tx.RlpDecode(data)
return tx
}
func NewTransactionFromValue(val *ethutil.Value) *Transaction {
tx := &Transaction{}
tx.RlpValueDecode(val)
return tx
}
func (tx *Transaction) Hash() []byte {
data := []interface{}{tx.Nonce, tx.gasPrice, tx.gas, tx.recipient, tx.Value, tx.Data}
return crypto.Sha3(ethutil.NewValue(data).Encode())
}
func (self *Transaction) Data() []byte {
return self.data
}
func (self *Transaction) Gas() *big.Int {
return self.gas
}
func (self *Transaction) GasPrice() *big.Int {
return self.gasPrice
}
func (self *Transaction) Value() *big.Int {
return self.value
}
func (self *Transaction) Nonce() uint64 {
return self.nonce
}
func (self *Transaction) SetNonce(nonce uint64) {
self.nonce = nonce
}
func (self *Transaction) From() []byte {
return self.sender()
}
func (self *Transaction) To() []byte {
return self.recipient
}
func (tx *Transaction) Curve() (v byte, r []byte, s []byte) {
v = tx.v
r = ethutil.LeftPadBytes(tx.r, 32)
s = ethutil.LeftPadBytes(tx.s, 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)
return pubkey
}
func (tx *Transaction) sender() []byte {
pubkey := tx.PublicKey()
// Validate the returned key.
// Return nil if public key isn't in full format
if len(pubkey) == 0 || pubkey[0] != 4 {
return nil
}
return crypto.Sha3(pubkey[1:])[12:]
}
func (tx *Transaction) Sign(privk []byte) error {
sig := tx.Signature(privk)
tx.r = sig[:32]
tx.s = sig[32:64]
tx.v = sig[64] + 27
return nil
}
func (tx *Transaction) RlpData() interface{} {
data := []interface{}{tx.Nonce, tx.GasPrice, tx.Gas, tx.recipient, tx.Value, tx.Data}
// TODO Remove prefixing zero's
return append(data, tx.v, new(big.Int).SetBytes(tx.r).Bytes(), new(big.Int).SetBytes(tx.s).Bytes())
}
func (tx *Transaction) RlpValue() *ethutil.Value {
return ethutil.NewValue(tx.RlpData())
}
func (tx *Transaction) RlpEncode() []byte {
return tx.RlpValue().Encode()
}
func (tx *Transaction) RlpDecode(data []byte) {
tx.RlpValueDecode(ethutil.NewValueFromBytes(data))
}
func (tx *Transaction) RlpValueDecode(decoder *ethutil.Value) {
tx.nonce = decoder.Get(0).Uint()
tx.gasPrice = decoder.Get(1).BigInt()
tx.gas = decoder.Get(2).BigInt()
tx.recipient = decoder.Get(3).Bytes()
tx.value = decoder.Get(4).BigInt()
tx.data = decoder.Get(5).Bytes()
tx.v = byte(decoder.Get(6).Uint())
tx.r = decoder.Get(7).Bytes()
tx.s = decoder.Get(8).Bytes()
}
func (tx *Transaction) String() string {
return fmt.Sprintf(`
TX(%x)
Contract: %v
From: %x
To: %x
Nonce: %v
GasPrice: %v
Gas: %v
Value: %v
Data: 0x%x
V: 0x%x
R: 0x%x
S: 0x%x
`,
tx.Hash(),
len(tx.recipient) == 0,
tx.From(),
tx.recipient,
tx.nonce,
tx.gasPrice,
tx.gas,
tx.Value,
tx.Data,
tx.v,
tx.r,
tx.s)
}
// Transaction slice type for basic sorting
type Transactions []*Transaction
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 { return ethutil.Rlp(s[i]) }
type TxByNonce struct{ Transactions }
func (s TxByNonce) Less(i, j int) bool {
return s.Transactions[i].nonce < s.Transactions[j].nonce
}
