229 lines
10 KiB
Python
229 lines
10 KiB
Python
#!/usr/bin/env python3
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import sys
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if sys.version_info.major < 3:
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sys.stderr.write('Sorry, Python 3.x required by this example.\n')
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sys.exit(1)
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import zcash
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import zcash.rpc
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from zcash import SelectParams
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from zcash.core import b2x, lx, x, b2lx, COIN, COutPoint, CMutableTxOut, CMutableTxIn, CMutableTransaction, Hash160
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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
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from zcash.core.scripteval import VerifyScript, SCRIPT_VERIFY_P2SH
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from zcash.wallet import CBitcoinAddress, CBitcoinSecret, P2SHBitcoinAddress, P2PKHBitcoinAddress
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from xcat.utils import x2s
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FEE = 0.001*COIN
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class zcashProxy():
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def __init__(self, network='regtest', timeout=900):
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self.network = network
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self.timeout = timeout
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SelectParams(self.network)
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self.zcashd = zcash.rpc.Proxy(timeout=self.timeout)
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def validateaddress(self, addr):
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return self.zcashd.validateaddress(addr)
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def get_keys(self, funder_address, redeemer_address):
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fundpubkey = CBitcoinAddress(funder_address)
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redeempubkey = CBitcoinAddress(redeemer_address)
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return fundpubkey, redeempubkey
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def privkey(self, address):
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self.zcashd.dumpprivkey(address)
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def hashtimelockcontract(self, funder, redeemer, commitment, locktime):
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funderAddr = CBitcoinAddress(funder)
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redeemerAddr = CBitcoinAddress(redeemer)
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if type(commitment) == str:
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commitment = x(commitment)
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# h = sha256(secret)
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blocknum = self.zcashd.getblockcount()
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print("Current blocknum on Zcash: ", blocknum)
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redeemblocknum = blocknum + locktime
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print("Redeemblocknum on Zcash: ", redeemblocknum)
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# 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)
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zec_redeemScript = CScript([OP_IF, OP_SHA256, commitment, OP_EQUALVERIFY,OP_DUP, OP_HASH160,
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redeemerAddr, OP_ELSE, redeemblocknum, OP_CHECKLOCKTIMEVERIFY, OP_DROP, OP_DUP, OP_HASH160,
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funderAddr, OP_ENDIF,OP_EQUALVERIFY, OP_CHECKSIG])
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# print("Redeem script for p2sh contract on Zcash blockchain: ", b2x(zec_redeemScript))
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txin_scriptPubKey = zec_redeemScript.to_p2sh_scriptPubKey()
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# Convert the P2SH scriptPubKey to a base58 Bitcoin address
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txin_p2sh_address = CBitcoinAddress.from_scriptPubKey(txin_scriptPubKey)
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p2sh = str(txin_p2sh_address)
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print("p2sh computed: ", p2sh)
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# Import address as soon as you create it
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self.zcashd.importaddress(p2sh, "", False)
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# Returning all this to be saved locally in p2sh.json
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return {'p2sh': p2sh, 'redeemblocknum': redeemblocknum, 'redeemScript': b2x(zec_redeemScript), 'redeemer': redeemer, 'funder': funder, 'locktime': locktime}
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def fund_htlc(self, p2sh, amount):
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send_amount = float(amount)*COIN
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# Import addr at same time as you fund
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self.zcashd.importaddress(p2sh, "", False)
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fund_txid = self.zcashd.sendtoaddress(p2sh, send_amount)
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txid = b2x(lx(b2x(fund_txid)))
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return txid
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# Following two functions are about the same
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def check_funds(self, p2sh):
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self.zcashd.importaddress(p2sh, "", False)
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# Get amount in address
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amount = self.zcashd.getreceivedbyaddress(p2sh, 0)
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amount = amount/COIN
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return amount
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def get_fund_status(self, p2sh):
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self.zcashd.importaddress(p2sh, "", False)
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amount = self.zcashd.getreceivedbyaddress(p2sh, 0)
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amount = amount/COIN
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print("Amount in zcash p2sh: ", amount, p2sh)
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if amount > 0:
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return 'funded'
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else:
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return 'empty'
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def get_tx_details(self, txid):
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fund_txinfo = self.zcashd.gettransaction(txid)
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return fund_txinfo['details'][0]
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def find_transaction_to_address(self, p2sh):
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self.zcashd.importaddress(p2sh, "", False)
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txs = self.zcashd.listunspent(0, 100)
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for tx in txs:
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if tx['address'] == CBitcoinAddress(p2sh):
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print("Found tx to p2sh", p2sh)
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return tx
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def find_secret(self, p2sh, fundtx_input):
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txs = self.zcashd.call('listtransactions', "*", 20, 0, True)
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for tx in txs:
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raw = self.zcashd.gettransaction(lx(tx['txid']))['hex']
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decoded = self.zcashd.decoderawtransaction(raw)
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if('txid' in decoded['vin'][0]):
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sendid = decoded['vin'][0]['txid']
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if (sendid == fundtx_input ):
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print("Found funding tx: ", sendid)
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return self.parse_secret(lx(tx['txid']))
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print("Redeem transaction with secret not found")
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return
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def parse_secret(self, txid):
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raw = self.zcashd.gettransaction(txid, True)['hex']
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decoded = self.zcashd.decoderawtransaction(raw)
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scriptSig = decoded['vin'][0]['scriptSig']
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asm = scriptSig['asm'].split(" ")
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pubkey = asm[1]
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secret = x2s(asm[2])
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redeemPubkey = P2PKHBitcoinAddress.from_pubkey(x(pubkey))
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return secret
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def redeem_contract(self, contract, secret):
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# How to find redeemScript and redeemblocknum from blockchain?
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p2sh = contract.p2sh
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#checking there are funds in the address
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amount = self.check_funds(p2sh)
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if(amount == 0):
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print("Address ", p2sh, " not funded")
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quit()
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fundtx = self.find_transaction_to_address(p2sh)
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amount = fundtx['amount'] / COIN
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# print("Found fund_tx: ", fundtx)
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p2sh = P2SHBitcoinAddress(p2sh)
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if fundtx['address'] == p2sh:
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print("Found {0} in p2sh {1}, redeeming...".format(amount, p2sh))
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# Where can you find redeemblocknum in the transaction?
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# redeemblocknum = find_redeemblocknum(contract)
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blockcount = self.zcashd.getblockcount()
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print("\nCurrent blocknum at time of redeem on Zcash:", blockcount)
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if blockcount < contract.redeemblocknum:
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# TODO: parse the script once, up front.
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redeemPubKey = self.find_redeemAddr(contract)
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print('redeemPubKey', redeemPubKey)
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zec_redeemScript = CScript(x(contract.redeemScript))
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txin = CMutableTxIn(fundtx['outpoint'])
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txout = CMutableTxOut(fundtx['amount'] - FEE, redeemPubKey.to_scriptPubKey())
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# Create the unsigned raw transaction.
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tx = CMutableTransaction([txin], [txout])
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sighash = SignatureHash(zec_redeemScript, tx, 0, SIGHASH_ALL)
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# TODO: figure out how to better protect privkey
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privkey = self.zcashd.dumpprivkey(redeemPubKey)
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sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
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print("SECRET", secret)
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preimage = secret.encode('utf-8')
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txin.scriptSig = CScript([sig, privkey.pub, preimage, OP_TRUE, zec_redeemScript])
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txin_scriptPubKey = zec_redeemScript.to_p2sh_scriptPubKey()
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print('Raw redeem transaction hex: ', b2x(tx.serialize()))
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VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,))
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print("Script verified, sending raw redeem transaction...")
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txid = self.zcashd.sendrawtransaction(tx)
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redeem_tx = b2x(lx(b2x(txid)))
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fund_tx = str(fundtx['outpoint'])
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return {"redeem_tx": redeem_tx, "fund_tx": fund_tx}
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else:
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print("nLocktime exceeded, refunding")
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refundPubKey = self.find_refundAddr(contract)
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print('refundPubKey', refundPubKey)
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txid = self.zcashd.sendtoaddress(refundPubKey, fundtx['amount'] - FEE)
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refund_tx = b2x(lx(b2x(txid)))
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fund_tx = str(fundtx['outpoint'])
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return {"refund_tx": refund_tx, "fund_tx": fund_tx}
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else:
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print("No contract for this p2sh found in database", p2sh)
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def parse_script(self, script_hex):
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redeemScript = self.zcashd.decodescript(script_hex)
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scriptarray = redeemScript['asm'].split(' ')
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return scriptarray
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def find_redeemblocknum(self, contract):
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print("In find_redeemblocknum")
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scriptarray = self.parse_script(contract.redeemScript)
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print("Returning scriptarray", scriptarray)
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redeemblocknum = scriptarray[8]
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return int(redeemblocknum)
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def find_redeemAddr(self, contract):
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scriptarray = self.parse_script(contract.redeemScript)
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redeemer = scriptarray[6]
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redeemAddr = P2PKHBitcoinAddress.from_bytes(x(redeemer))
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return redeemAddr
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def find_refundAddr(self, contract):
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scriptarray = self.parse_script(contract.redeemScript)
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funder = scriptarray[13]
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refundAddr = P2PKHBitcoinAddress.from_bytes(x(funder))
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return refundAddr
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def find_recipient(self, contract):
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# make this dependent on actual fund tx to p2sh, not contract
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txid = contract.fund_tx
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raw = self.zcashd.gettransaction(lx(txid), True)['hex']
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decoded = self.zcashd.decoderawtransaction(raw)
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scriptSig = decoded['vin'][0]['scriptSig']
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print("Decoded", scriptSig)
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asm = scriptSig['asm'].split(" ")
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pubkey = asm[1]
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initiator = CBitcoinAddress(contract.initiator)
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fulfiller = CBitcoinAddress(contract.fulfiller)
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print("Initiator", b2x(initiator))
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print("Fulfiller", b2x(fulfiller))
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print('pubkey', pubkey)
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redeemPubkey = P2PKHBitcoinAddress.from_pubkey(x(pubkey))
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print('redeemPubkey', redeemPubkey)
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def new_zcash_addr(self):
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addr = self.zcashd.getnewaddress()
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return str(addr)
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def generate(self, num):
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blocks = self.zcashd.generate(num)
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return blocks
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