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btc.go
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btc.go
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package hdwallet
import (
"context"
"errors"
"fmt"
"strings"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/google/uuid"
"github.com/republicprotocol/libbtc-go"
)
const DefaultBitcoinFee = 10000
type btcGenerator struct {
address string
network string
}
func NewBTCGenerator(address, network string) Generator {
return &btcGenerator{address, strings.ToLower(network)}
}
func (generator *btcGenerator) GenerateAddress(uuid uuid.UUID) (string, error) {
net, err := networkParams(generator.network)
if err != nil {
return "", err
}
pkHash, err := addressToPubKeyHash(generator.address, net)
if err != nil {
return "", err
}
userSpecificScript, err := newScript(uuid, pkHash.Hash160()[:])
if err != nil {
return "", err
}
address, err := btcutil.NewAddressScriptHash(userSpecificScript, net)
if err != nil {
return "", err
}
return address.EncodeAddress(), nil
}
func addressToPubKeyHash(addrString string, chainParams *chaincfg.Params) (*btcutil.AddressPubKeyHash, error) {
btcAddr, err := btcutil.DecodeAddress(addrString, chainParams)
if err != nil {
return nil, fmt.Errorf("address %s is not "+
"intended for use on %v", addrString, chainParams.Name)
}
addr, ok := btcAddr.(*btcutil.AddressPubKeyHash)
if !ok {
return nil, errors.New("%s is not p2pkh address")
}
return addr, nil
}
func newScript(uuid uuid.UUID, pkHash []byte) ([]byte, error) {
b := txscript.NewScriptBuilder()
b.AddData(uuid[:])
b.AddOp(txscript.OP_DROP)
b.AddOp(txscript.OP_DUP)
b.AddOp(txscript.OP_HASH160)
b.AddData(pkHash[:])
b.AddOp(txscript.OP_EQUALVERIFY)
b.AddOp(txscript.OP_CHECKSIG)
return b.Script()
}
type btcCollector struct {
wif string
network string
}
func NewBTCCollector(wif, network string) Collector {
return &btcCollector{wif, strings.ToLower(network)}
}
func (collector *btcCollector) Collect(ctx context.Context, address string, uuids []uuid.UUID) error {
net, err := networkParams(collector.network)
if err != nil {
return err
}
wif, err := btcutil.DecodeWIF(collector.wif)
if err != nil {
return err
}
pubKeyBytes, err := SerializedPublicKey(wif.PrivKey.PubKey(), net)
if err != nil {
return err
}
AddrPubKey, err := btcutil.NewAddressPubKey(pubKeyBytes, net)
if err != nil {
return err
}
addr, err := btcutil.DecodeAddress(address, net)
if err != nil {
return err
}
pkHash := AddrPubKey.AddressPubKeyHash().Hash160()
scripts := [][]byte{}
for _, uuid := range uuids {
script, err := newScript(uuid, pkHash[:])
if err != nil {
return err
}
scripts = append(scripts, script)
}
return collectBTC(ctx, addr, scripts, libbtc.NewAccount(libbtc.NewBlockchainInfoClient(collector.network), wif.PrivKey.ToECDSA()))
}
func collectBTC(ctx context.Context, address btcutil.Address, scripts [][]byte, account libbtc.Account) error {
payToAddrScript, err := txscript.PayToAddrScript(address)
if err != nil {
return err
}
for _, script := range scripts {
scriptAddress, err := btcutil.NewAddressScriptHash(script, account.NetworkParams())
if err != nil {
return err
}
if err := account.SendTransaction(
ctx,
script,
DefaultBitcoinFee,
nil,
func(msgTx *wire.MsgTx) bool {
balance, err := account.Balance(ctx, scriptAddress.EncodeAddress(), 0)
if err != nil {
return false
}
if balance < DefaultBitcoinFee {
return false
}
msgTx.AddTxOut(wire.NewTxOut(balance-DefaultBitcoinFee, payToAddrScript))
return true
},
nil,
func(msgTx *wire.MsgTx) bool {
spent, err := account.ScriptSpent(ctx, scriptAddress.EncodeAddress())
if err != nil {
return false
}
return spent
},
); err != nil {
return err
}
}
return nil
}
func SerializedPublicKey(pubKey *btcec.PublicKey, net *chaincfg.Params) ([]byte, error) {
switch net {
case &chaincfg.MainNetParams:
return pubKey.SerializeCompressed(), nil
case &chaincfg.TestNet3Params:
return pubKey.SerializeUncompressed(), nil
default:
return nil, fmt.Errorf("unsupported network: %v", net.Name)
}
}
func networkParams(network string) (*chaincfg.Params, error) {
switch network {
case "testnet", "testnet3":
return &chaincfg.TestNet3Params, nil
case "mainnet":
return &chaincfg.MainNetParams, nil
default:
return nil, fmt.Errorf("unsupported network: %s", network)
}
}