package ethchain
import (
"bytes"
"github.com/ethereum/eth-go/ethutil"
"github.com/obscuren/secp256k1-go"
"math/big"
)
var ContractAddr = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
type Transaction struct {
Nonce uint64
Recipient []byte
Value *big.Int
Data []string
Memory []int
v byte
r, s []byte
}
func NewTransaction(to []byte, value *big.Int, data []string) *Transaction {
tx := Transaction{Recipient: to, Value: value}
tx.Nonce = 0
// Serialize the data
tx.Data = data
return &tx
}
// XXX Deprecated
func NewTransactionFromData(data []byte) *Transaction {
return NewTransactionFromBytes(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 := make([]interface{}, len(tx.Data))
for i, val := range tx.Data {
data[i] = val
}
preEnc := []interface{}{
tx.Nonce,
tx.Recipient,
tx.Value,
data,
}
return ethutil.Sha3Bin(ethutil.Encode(preEnc))
}
func (tx *Transaction) IsContract() bool {
return bytes.Compare(tx.Recipient, ContractAddr) == 0
}
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()
// If we don't make a copy we will overwrite the existing underlying array
dst := make([]byte, len(tx.r))
copy(dst, tx.r)
sig := append(dst, tx.s...)
sig = append(sig, tx.v-27)
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 pubkey[0] != 4 {
return nil
}
return ethutil.Sha3Bin(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{} {
// Prepare the transaction for serialization
return []interface{}{
tx.Nonce,
tx.Recipient,
tx.Value,
ethutil.NewSliceValue(tx.Data).Slice(),
tx.v,
tx.r,
tx.s,
}
}
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.Recipient = decoder.Get(1).Bytes()
tx.Value = decoder.Get(2).BigInt()
d := decoder.Get(3)
tx.Data = make([]string, d.Len())
for i := 0; i < d.Len(); i++ {
tx.Data[i] = d.Get(i).Str()
}
// TODO something going wrong here
tx.v = byte(decoder.Get(4).Uint())
tx.r = decoder.Get(5).Bytes()
tx.s = decoder.Get(6).Bytes()
}
