170 lines
3.6 KiB
Go
170 lines
3.6 KiB
Go
package ethchain
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import (
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"github.com/ethereum/eth-go/ethutil"
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"github.com/obscuren/secp256k1-go"
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"math/big"
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)
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var ContractAddr = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
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type Transaction struct {
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Nonce uint64
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Recipient []byte
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Value *big.Int
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Gas *big.Int
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Gasprice *big.Int
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Data []string
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v byte
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r, s []byte
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// Indicates whether this tx is a contract creation transaction
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contractCreation bool
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}
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func NewContractCreationTx(value, gasprice *big.Int, data []string) *Transaction {
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return &Transaction{Value: value, Gasprice: gasprice, Data: data, contractCreation: true}
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}
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func NewTransactionMessage(to []byte, value, gasprice, gas *big.Int, data []string) *Transaction {
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return &Transaction{Recipient: to, Value: value, Gasprice: gasprice, Gas: gas, Data: data}
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}
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func NewTransactionFromBytes(data []byte) *Transaction {
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tx := &Transaction{}
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tx.RlpDecode(data)
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return tx
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}
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func NewTransactionFromValue(val *ethutil.Value) *Transaction {
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tx := &Transaction{}
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tx.RlpValueDecode(val)
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return tx
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}
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func (tx *Transaction) Hash() []byte {
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data := make([]interface{}, len(tx.Data))
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for i, val := range tx.Data {
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data[i] = val
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}
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preEnc := []interface{}{
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tx.Nonce,
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tx.Recipient,
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tx.Value,
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data,
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}
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return ethutil.Sha3Bin(ethutil.Encode(preEnc))
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}
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func (tx *Transaction) IsContract() bool {
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return tx.contractCreation
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}
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func (tx *Transaction) Signature(key []byte) []byte {
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hash := tx.Hash()
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sig, _ := secp256k1.Sign(hash, key)
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return sig
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}
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func (tx *Transaction) PublicKey() []byte {
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hash := tx.Hash()
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// If we don't make a copy we will overwrite the existing underlying array
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dst := make([]byte, len(tx.r))
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copy(dst, tx.r)
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sig := append(dst, tx.s...)
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sig = append(sig, tx.v-27)
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pubkey, _ := secp256k1.RecoverPubkey(hash, sig)
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return pubkey
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}
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func (tx *Transaction) Sender() []byte {
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pubkey := tx.PublicKey()
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// Validate the returned key.
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// Return nil if public key isn't in full format
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if pubkey[0] != 4 {
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return nil
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}
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return ethutil.Sha3Bin(pubkey[1:])[12:]
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}
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func (tx *Transaction) Sign(privk []byte) error {
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sig := tx.Signature(privk)
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tx.r = sig[:32]
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tx.s = sig[32:64]
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tx.v = sig[64] + 27
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return nil
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}
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func (tx *Transaction) RlpData() interface{} {
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data := []interface{}{tx.Nonce, tx.Value, tx.Gasprice}
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if !tx.contractCreation {
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data = append(data, tx.Recipient, tx.Gas)
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}
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d := ethutil.NewSliceValue(tx.Data).Slice()
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return append(data, d, tx.v, tx.r, tx.s)
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}
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func (tx *Transaction) RlpValue() *ethutil.Value {
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return ethutil.NewValue(tx.RlpData())
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}
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func (tx *Transaction) RlpEncode() []byte {
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return tx.RlpValue().Encode()
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}
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func (tx *Transaction) RlpDecode(data []byte) {
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tx.RlpValueDecode(ethutil.NewValueFromBytes(data))
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}
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func (tx *Transaction) RlpValueDecode(decoder *ethutil.Value) {
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tx.Nonce = decoder.Get(0).Uint()
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tx.Value = decoder.Get(1).BigInt()
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tx.Gasprice = decoder.Get(2).BigInt()
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// If the 4th item is a list(slice) this tx
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// is a contract creation tx
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if decoder.Get(3).IsList() {
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d := decoder.Get(3)
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tx.Data = make([]string, d.Len())
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for i := 0; i < d.Len(); i++ {
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tx.Data[i] = d.Get(i).Str()
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}
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tx.v = byte(decoder.Get(4).Uint())
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tx.r = decoder.Get(5).Bytes()
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tx.s = decoder.Get(6).Bytes()
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tx.contractCreation = true
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} else {
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tx.Recipient = decoder.Get(3).Bytes()
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tx.Gas = decoder.Get(4).BigInt()
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d := decoder.Get(5)
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tx.Data = make([]string, d.Len())
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for i := 0; i < d.Len(); i++ {
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tx.Data[i] = d.Get(i).Str()
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}
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tx.v = byte(decoder.Get(6).Uint())
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tx.r = decoder.Get(7).Bytes()
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tx.s = decoder.Get(8).Bytes()
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}
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}
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