#!/usr/bin/env python3 import sys import bitcoin import bitcoin.rpc # from bitcoin import SelectParams from bitcoin.core import b2x, lx, x, COIN, CMutableTxOut from bitcoin.core import CMutableTxIn, CMutableTransaction from bitcoin.core.script import CScript, OP_DUP, OP_IF, OP_ELSE, OP_ENDIF from bitcoin.core.script import OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG from bitcoin.core.script import SignatureHash, SIGHASH_ALL, OP_FALSE, OP_DROP from bitcoin.core.script import OP_CHECKLOCKTIMEVERIFY, OP_SHA256, OP_TRUE from bitcoin.core.scripteval import VerifyScript, SCRIPT_VERIFY_P2SH from bitcoin.wallet import CBitcoinAddress, P2SHBitcoinAddress from bitcoin.wallet import P2PKHBitcoinAddress # import xcat.utils as utils import logging if sys.version_info.major < 3: sys.stderr.write('Sorry, Python 3.x required by this example.\n') sys.exit(1) FEE = 0.001 * COIN class bitcoinProxy(): def __init__(self, network='regtest', timeout=900): if network is not 'testnet' and network is not 'mainnet': network = 'regtest' logging.debug("NETWORK in proxy: {0}".format(network)) self.network = network self.timeout = timeout bitcoin.SelectParams(self.network) self.bitcoind = bitcoin.rpc.Proxy(timeout=self.timeout) def validateaddress(self, addr): return self.bitcoind.validateaddress(addr) def find_secret(self, p2sh, fundtx_input): txs = self.bitcoind.call('listtransactions', "*", 20, 0, True) for tx in txs: raw = self.bitcoind.gettransaction(lx(tx['txid']))['hex'] decoded = self.bitcoind.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 self.parse_secret(lx(tx['txid'])) print("Redeem transaction with secret not found") return # def parse_secret(self, txid): # raw = zcashd.gettransaction(txid, True)['hex'] # decoded = zcashd.call('decoderawtransaction', raw) # scriptSig = decoded['vin'][0]['scriptSig'] # asm = scriptSig['asm'].split(" ") # # pubkey = asm[1] # secret = utils.x2s(asm[2]) # # redeemPubkey = P2PKHBitcoinAddress.from_pubkey(x(pubkey)) # return secret def get_keys(self, funder_address, redeemer_address): fundpubkey = CBitcoinAddress(funder_address) redeempubkey = CBitcoinAddress(redeemer_address) # fundpubkey = self.bitcoind.getnewaddress() # redeempubkey = self.bitcoind.getnewaddress() return fundpubkey, redeempubkey def privkey(self, address): self.bitcoind.dumpprivkey(address) def hashtimelockcontract(self, funder, redeemer, commitment, locktime): funderAddr = CBitcoinAddress(funder) redeemerAddr = CBitcoinAddress(redeemer) if type(commitment) == str: commitment = x(commitment) # h = sha256(secret) blocknum = self.bitcoind.getblockcount() print("Current blocknum on Bitcoin: ", blocknum) redeemblocknum = blocknum + locktime print("Redeemblocknum on Bitcoin: ", redeemblocknum) 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 Bitcoin blockchain: " # "{0}".format(b2x(redeemScript))) txin_scriptPubKey = 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) # Import address at same time you create self.bitcoind.importaddress(p2sh, "", False) print("p2sh computed", p2sh) return {'p2sh': p2sh, 'redeemblocknum': redeemblocknum, 'redeemScript': b2x(redeemScript), 'redeemer': redeemer, 'funder': funder, 'locktime': locktime} def fund_htlc(self, p2sh, amount): send_amount = float(amount) * COIN # Import address at same time that you fund it self.bitcoind.importaddress(p2sh, "", False) fund_txid = self.bitcoind.sendtoaddress(p2sh, send_amount) txid = b2x(lx(b2x(fund_txid))) return txid # Following two functions are about the same def check_funds(self, p2sh): self.bitcoind.importaddress(p2sh, "", False) # Get amount in address amount = self.bitcoind.getreceivedbyaddress(p2sh, 0) amount = amount / COIN return amount def get_fund_status(self, p2sh): self.bitcoind.importaddress(p2sh, "", False) amount = self.bitcoind.getreceivedbyaddress(p2sh, 0) amount = amount / COIN print("Amount in bitcoin p2sh: ", amount, p2sh) if amount > 0: return 'funded' else: return 'empty' # TODO: FIX search for p2sh in block # def search_p2sh(self, block, p2sh): # print("Fetching block...") # blockdata = self.bitcoind.getblock(lx(block)) # print("done fetching block") # txs = blockdata.vtx # print("txs", txs) # for tx in txs: # txhex = b2x(tx.serialize()) # # Using my fork of python-zcashlib to get result of decoderawtransaction # txhex = txhex + '00' # rawtx = zcashd.decoderawtransaction(txhex) # # print('rawtx', rawtx) # print(rawtx) # for vout in rawtx['vout']: # if 'addresses' in vout['scriptPubKey']: # for addr in vout['scriptPubKey']['addresses']: # print("Sent to address:", addr) # if addr == p2sh: # print("Address to p2sh found in transaction! ", # addr) # print("Returning from search_p2sh") def get_tx_details(self, txid): # must convert txid string to bytes x(txid) fund_txinfo = self.bitcoind.gettransaction(lx(txid)) return fund_txinfo['details'][0] def redeem_contract(self, contract, secret): print("Parsing script for redeem_contract...") scriptarray = self.parse_script(contract.redeemScript) redeemblocknum = scriptarray[8] self.redeemPubKey = P2PKHBitcoinAddress.from_bytes(x(scriptarray[6])) # refundPubKey = P2PKHBitcoinAddress.from_bytes(x(scriptarray[13])) p2sh = contract.p2sh # checking there are funds in the address amount = self.check_funds(p2sh) if(amount == 0): print("address ", p2sh, " not funded") quit() fundtx = self.find_transaction_to_address(p2sh) amount = fundtx['amount'] / COIN # print("Found fund_tx: ", fundtx) p2sh = P2SHBitcoinAddress(p2sh) if fundtx['address'] == p2sh: print("Found {0} in p2sh {1}, redeeming...".format(amount, p2sh)) blockcount = self.bitcoind.getblockcount() print("\nCurrent blocknum at time of redeem on Zcash:", blockcount) if blockcount < int(redeemblocknum): return self.redeem(contract, fundtx, secret) else: print("nLocktime exceeded, refunding") return self.refund(contract) else: print("No contract for this p2sh found in database", p2sh) def redeem(self, contract, fundtx, secret): print('redeemPubKey', self.redeemPubKey) # TODO: Compare with script on blockchain? redeemScript = CScript(x(contract.redeemScript)) txin = CMutableTxIn(fundtx['outpoint']) txout = CMutableTxOut(fundtx['amount'] - FEE, self.redeemPubKey.to_scriptPubKey()) # Create the unsigned raw transaction. tx = CMutableTransaction([txin], [txout]) sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL) # TODO: protect privkey better, separate signing from rawtx creation privkey = self.bitcoind.dumpprivkey(self.redeemPubKey) sig = privkey.sign(sighash) + bytes([SIGHASH_ALL]) preimage = secret.encode('utf-8') txin.scriptSig = CScript([sig, privkey.pub, preimage, OP_TRUE, redeemScript]) # print("txin.scriptSig", b2x(txin.scriptSig)) txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey() print('Raw redeem transaction hex: ', b2x(tx.serialize())) VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,)) print("Script verified, sending raw transaction...") txid = self.bitcoind.sendrawtransaction(tx) fund_tx = str(fundtx['outpoint']) redeem_tx = b2x(lx(b2x(txid))) return {"redeem_tx": redeem_tx, "fund_tx": fund_tx} def refund(self, contract): fundtx = self.find_transaction_to_address(contract.p2sh) print("Fund tx found in refund: ", fundtx) refundPubKey = self.find_refundAddr(contract) print('refundPubKey: {0}'.format(refundPubKey)) redeemScript = CScript(x(contract.redeemScript)) txin = CMutableTxIn(fundtx['outpoint']) txout = CMutableTxOut(fundtx['amount'] - FEE, refundPubKey.to_scriptPubKey()) # Create the unsigned raw transaction. tx = CMutableTransaction([txin], [txout]) sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL) privkey = self.bitcoind.dumpprivkey(refundPubKey) sig = privkey.sign(sighash) + bytes([SIGHASH_ALL]) # Sign without secret txin.scriptSig = CScript([sig, privkey.pub, OP_FALSE, redeemScript]) # txin.nSequence = 2185 txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey() print('Raw redeem transaction hex: {0}'.format(b2x(tx.serialize()))) res = VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,)) print("Script verified, sending raw transaction... (NOT)", res) txid = self.bitcoind.sendrawtransaction(tx) refund_tx = b2x(lx(b2x(txid))) fund_tx = str(fundtx['outpoint']) return {"refund_tx": refund_tx, "fund_tx": fund_tx} def parse_script(self, script_hex): redeemScript = self.bitcoind.call('decodescript', script_hex) scriptarray = redeemScript['asm'].split(' ') return scriptarray def find_redeemblocknum(self, contract): scriptarray = self.parse_script(contract.redeemScript) redeemblocknum = scriptarray[8] return int(redeemblocknum) def find_redeemAddr(self, contract): scriptarray = self.parse_script(contract.redeemScript) redeemer = scriptarray[6] redeemAddr = P2PKHBitcoinAddress.from_bytes(x(redeemer)) return redeemAddr def find_refundAddr(self, contract): scriptarray = self.parse_script(contract.redeemScript) funder = scriptarray[13] refundAddr = P2PKHBitcoinAddress.from_bytes(x(funder)) return refundAddr def find_transaction_to_address(self, p2sh): self.bitcoind.importaddress(p2sh, "", False) txs = self.bitcoind.listunspent() for tx in txs: if tx['address'] == CBitcoinAddress(p2sh): logging.debug("Found tx to p2sh: {0}".format(p2sh)) return tx def new_bitcoin_addr(self): addr = self.bitcoind.getnewaddress() return str(addr) def generate(self, num): blocks = self.bitcoind.generate(num) return blocks