254 lines
10 KiB
Python
254 lines
10 KiB
Python
#!/usr/bin/env python3
|
|
|
|
# Based on spend-p2sh-txout.py from python-bitcoinlib.
|
|
# Copyright (C) 2017 The Zcash developers
|
|
|
|
import sys
|
|
if sys.version_info.major < 3:
|
|
sys.stderr.write('Sorry, Python 3.x required by this example.\n')
|
|
sys.exit(1)
|
|
|
|
import zcash
|
|
import zcash.rpc
|
|
from zcash import SelectParams
|
|
from zcash.core import b2x, lx, x, b2lx, COIN, COutPoint, CMutableTxOut, CMutableTxIn, CMutableTransaction, Hash160
|
|
from zcash.core.script import CScript, OP_DUP, OP_IF, OP_ELSE, OP_ENDIF, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG, SignatureHash, SIGHASH_ALL, OP_FALSE, OP_DROP, OP_CHECKLOCKTIMEVERIFY, OP_SHA256, OP_TRUE
|
|
from zcash.core.scripteval import VerifyScript, SCRIPT_VERIFY_P2SH
|
|
from zcash.wallet import CBitcoinAddress, CBitcoinSecret, P2SHBitcoinAddress, P2PKHBitcoinAddress
|
|
|
|
from xcat.utils import *
|
|
|
|
# SelectParams('testnet')
|
|
SelectParams('regtest')
|
|
# TODO: accurately read user and pw info
|
|
zcashd = zcash.rpc.Proxy(service_url="http://user:password@127.0.0.1:18232")
|
|
FEE = 0.001*COIN
|
|
|
|
def x2s(hexstring):
|
|
"""Convert hex to a utf-8 string"""
|
|
return binascii.unhexlify(hexstring).decode('utf-8')
|
|
|
|
def validateaddress(addr):
|
|
return zcashd.validateaddress(addr)
|
|
|
|
def get_keys(funder_address, redeemer_address):
|
|
fundpubkey = CBitcoinAddress(funder_address)
|
|
redeempubkey = CBitcoinAddress(redeemer_address)
|
|
# fundpubkey = zcashd.getnewaddress()
|
|
# redeempubkey = zcashd.getnewaddress()
|
|
return fundpubkey, redeempubkey
|
|
|
|
def privkey(address):
|
|
zcashd.dumpprivkey(address)
|
|
|
|
def hashtimelockcontract(funder, redeemer, commitment, locktime):
|
|
funderAddr = CBitcoinAddress(funder)
|
|
redeemerAddr = CBitcoinAddress(redeemer)
|
|
if type(commitment) == str:
|
|
commitment = x(commitment)
|
|
# h = sha256(secret)
|
|
blocknum = zcashd.getblockcount()
|
|
print("Current blocknum", blocknum)
|
|
redeemblocknum = blocknum + locktime
|
|
print("REDEEMBLOCKNUM ZCASH", redeemblocknum)
|
|
print("COMMITMENT on zxcat", commitment)
|
|
# can rm op_dup and op_hash160 if you replace addrs with pubkeys (as raw hex/bin data?), and can rm last op_equalverify (for direct pubkey comparison)
|
|
zec_redeemScript = CScript([OP_IF, OP_SHA256, commitment, OP_EQUALVERIFY,OP_DUP, OP_HASH160,
|
|
redeemerAddr, OP_ELSE, redeemblocknum, OP_CHECKLOCKTIMEVERIFY, OP_DROP, OP_DUP, OP_HASH160,
|
|
funderAddr, OP_ENDIF,OP_EQUALVERIFY, OP_CHECKSIG])
|
|
print("Redeem script for p2sh contract on Zcash blockchain:", b2x(zec_redeemScript))
|
|
txin_scriptPubKey = zec_redeemScript.to_p2sh_scriptPubKey()
|
|
# Convert the P2SH scriptPubKey to a base58 Bitcoin address
|
|
txin_p2sh_address = CBitcoinAddress.from_scriptPubKey(txin_scriptPubKey)
|
|
p2sh = str(txin_p2sh_address)
|
|
print("p2sh computed", p2sh)
|
|
# Import address as soon as you create it
|
|
zcashd.importaddress(p2sh, "", False)
|
|
# Returning all this to be saved locally in p2sh.json
|
|
return {'p2sh': p2sh, 'redeemblocknum': redeemblocknum, 'redeemScript': b2x(zec_redeemScript), 'redeemer': redeemer, 'funder': funder, 'locktime': locktime}
|
|
|
|
def fund_htlc(p2sh, amount):
|
|
send_amount = float(amount)*COIN
|
|
# Import addr at same time as you fund
|
|
zcashd.importaddress(p2sh, "", False)
|
|
fund_txid = zcashd.sendtoaddress(p2sh, send_amount)
|
|
txid = b2x(lx(b2x(fund_txid)))
|
|
print("txid at end of fund_htlc in zcashRPC", txid)
|
|
# print("Dif version of txid", b2x(lx(fund_txid)))
|
|
return txid
|
|
|
|
# Following two functions are about the same
|
|
def check_funds(p2sh):
|
|
zcashd.importaddress(p2sh, "", False)
|
|
print("Imported address", p2sh)
|
|
# Get amount in address
|
|
amount = zcashd.getreceivedbyaddress(p2sh, 0)
|
|
print("Amount in address", amount)
|
|
amount = amount/COIN
|
|
return amount
|
|
|
|
def get_fund_status(p2sh):
|
|
zcashd.importaddress(p2sh, "", False)
|
|
amount = zcashd.getreceivedbyaddress(p2sh, 0)
|
|
amount = amount/COIN
|
|
print("Amount in zcash get_fund_status", amount, p2sh)
|
|
if amount > 0:
|
|
return 'funded'
|
|
else:
|
|
return 'empty'
|
|
|
|
def get_tx_details(txid):
|
|
fund_txinfo = zcashd.gettransaction(txid)
|
|
return fund_txinfo['details'][0]
|
|
|
|
def find_transaction_to_address(p2sh):
|
|
zcashd.importaddress(p2sh, "", False)
|
|
txs = zcashd.listunspent(0, 100)
|
|
for tx in txs:
|
|
if tx['address'] == CBitcoinAddress(p2sh):
|
|
print("Found tx to p2sh", p2sh)
|
|
print(tx)
|
|
return tx
|
|
|
|
def find_secret(p2sh, fundtx_input):
|
|
print("fundtx_input:", fundtx_input)
|
|
txs = zcashd.call('listtransactions', "*", 20, 0, True)
|
|
print('Length of txs from listtransactions():', len(txs))
|
|
for tx in txs:
|
|
raw = zcashd.gettransaction(lx(tx['txid']))['hex']
|
|
decoded = zcashd.decoderawtransaction(raw)
|
|
print("TXINFO", decoded['vin'][0])
|
|
if('txid' in decoded['vin'][0]):
|
|
sendid = decoded['vin'][0]['txid']
|
|
if (sendid == fundtx_input ):
|
|
print("Found funding tx: ", sendid)
|
|
return parse_secret(lx(tx['txid']))
|
|
print("Redeem transaction with secret not found")
|
|
return
|
|
|
|
def parse_secret(txid):
|
|
raw = zcashd.gettransaction(txid, True)['hex']
|
|
decoded = zcashd.decoderawtransaction(raw)
|
|
scriptSig = decoded['vin'][0]['scriptSig']
|
|
asm = scriptSig['asm'].split(" ")
|
|
pubkey = asm[1]
|
|
secret = x2s(asm[2])
|
|
redeemPubkey = P2PKHBitcoinAddress.from_pubkey(x(pubkey))
|
|
print('Veryify redeemPubkey: ', redeemPubkey)
|
|
print("Found secret in parse_secret:", secret)
|
|
return secret
|
|
|
|
def redeem_contract(contract, secret):
|
|
# How to find redeemScript and redeemblocknum from blockchain?
|
|
print("Contract in redeem contract", contract.__dict__)
|
|
p2sh = contract.p2sh
|
|
#checking there are funds in the address
|
|
amount = check_funds(p2sh)
|
|
if(amount == 0):
|
|
print("address ", p2sh, " not funded")
|
|
quit()
|
|
fundtx = find_transaction_to_address(p2sh)
|
|
amount = fundtx['amount'] / COIN
|
|
print("Found fundtx:", fundtx)
|
|
p2sh = P2SHBitcoinAddress(p2sh)
|
|
if fundtx['address'] == p2sh:
|
|
print("Found {0} in p2sh {1}, redeeming...".format(amount, p2sh))
|
|
|
|
# Where can you find redeemblocknum in the transaction?
|
|
# redeemblocknum = find_redeemblocknum(contract)
|
|
blockcount = zcashd.getblockcount()
|
|
print("\nCurrent blocknum at time of redeem on Zcash:", blockcount)
|
|
if blockcount < contract.redeemblocknum:
|
|
# TODO: parse the script once, up front.
|
|
redeemPubKey = find_redeemAddr(contract)
|
|
|
|
print('redeemPubKey', redeemPubKey)
|
|
zec_redeemScript = CScript(x(contract.redeemScript))
|
|
|
|
txin = CMutableTxIn(fundtx['outpoint'])
|
|
txout = CMutableTxOut(fundtx['amount'] - FEE, redeemPubKey.to_scriptPubKey())
|
|
# Create the unsigned raw transaction.
|
|
tx = CMutableTransaction([txin], [txout])
|
|
sighash = SignatureHash(zec_redeemScript, tx, 0, SIGHASH_ALL)
|
|
# TODO: figure out how to better protect privkey
|
|
privkey = zcashd.dumpprivkey(redeemPubKey)
|
|
sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
|
|
print("SECRET", secret)
|
|
preimage = secret.encode('utf-8')
|
|
txin.scriptSig = CScript([sig, privkey.pub, preimage, OP_TRUE, zec_redeemScript])
|
|
|
|
print("txin.scriptSig", b2x(txin.scriptSig))
|
|
txin_scriptPubKey = zec_redeemScript.to_p2sh_scriptPubKey()
|
|
print('Redeem txhex', b2x(tx.serialize()))
|
|
VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,))
|
|
print("script verified, sending raw tx")
|
|
txid = zcashd.sendrawtransaction(tx)
|
|
redeem_tx = b2x(lx(b2x(txid)))
|
|
fund_tx = str(fundtx['outpoint'])
|
|
print("Returning fund_tx", fund_tx)
|
|
print("Txid of submitted redeem tx: ", redeem_tx)
|
|
print("TXID SUCCESSFULLY REDEEMED")
|
|
return {"redeem_tx": redeem_tx, "fund_tx": fund_tx}
|
|
else:
|
|
print("nLocktime exceeded, refunding")
|
|
refundPubKey = find_refundAddr(contract)
|
|
print('refundPubKey', refundPubKey)
|
|
txid = zcashd.sendtoaddress(refundPubKey, fundtx['amount'] - FEE)
|
|
refund_tx = b2x(lx(b2x(txid)))
|
|
fund_tx = str(fundtx['outpoint'])
|
|
print("Returning fund_tx", fund_tx)
|
|
print("Txid of submitted refund tx: ", refund_tx)
|
|
print("TXID SUCCESSFULLY REDEEMED")
|
|
return {"refund_tx": refund_tx, "fund_tx": fund_tx}
|
|
else:
|
|
print("No contract for this p2sh found in database", p2sh)
|
|
|
|
def parse_script(script_hex):
|
|
redeemScript = zcashd.decodescript(script_hex)
|
|
scriptarray = redeemScript['asm'].split(' ')
|
|
return scriptarray
|
|
|
|
def find_redeemblocknum(contract):
|
|
print("In find_redeemblocknum")
|
|
scriptarray = parse_script(contract.redeemScript)
|
|
print("Returning scriptarray", scriptarray)
|
|
redeemblocknum = scriptarray[8]
|
|
return int(redeemblocknum)
|
|
|
|
def find_redeemAddr(contract):
|
|
scriptarray = parse_script(contract.redeemScript)
|
|
redeemer = scriptarray[6]
|
|
redeemAddr = P2PKHBitcoinAddress.from_bytes(x(redeemer))
|
|
return redeemAddr
|
|
|
|
def find_refundAddr(contract):
|
|
scriptarray = parse_script(contract.redeemScript)
|
|
funder = scriptarray[13]
|
|
refundAddr = P2PKHBitcoinAddress.from_bytes(x(funder))
|
|
return refundAddr
|
|
|
|
def find_recipient(contract):
|
|
# make this dependent on actual fund tx to p2sh, not contract
|
|
txid = contract.fund_tx
|
|
raw = zcashd.gettransaction(lx(txid), True)['hex']
|
|
decoded = zcashd.decoderawtransaction(raw)
|
|
scriptSig = decoded['vin'][0]['scriptSig']
|
|
print("Decoded", scriptSig)
|
|
asm = scriptSig['asm'].split(" ")
|
|
pubkey = asm[1]
|
|
initiator = CBitcoinAddress(contract.initiator)
|
|
fulfiller = CBitcoinAddress(contract.fulfiller)
|
|
print("Initiator", b2x(initiator))
|
|
print("Fulfiler", b2x(fulfiller))
|
|
print('pubkey', pubkey)
|
|
redeemPubkey = P2PKHBitcoinAddress.from_pubkey(x(pubkey))
|
|
print('redeemPubkey', redeemPubkey)
|
|
|
|
def new_zcash_addr():
|
|
addr = zcashd.getnewaddress()
|
|
return str(addr)
|
|
|
|
def generate(num):
|
|
blocks = zcashd.generate(num)
|
|
return blocks
|