mmgen-wallet/mmgen/proto/btc/tx/unsigned.py

#!/usr/bin/env python3
#
# mmgen = Multi-Mode GENerator, a command-line cryptocurrency wallet
# Copyright (C)2013-2023 The MMGen Project <mmgen@tuta.io>
# Licensed under the GNU General Public License, Version 3:
#   https://www.gnu.org/licenses
# Public project repositories:
#   https://github.com/mmgen/mmgen
#   https://gitlab.com/mmgen/mmgen

"""
proto.btc.tx.unsigned: Bitcoin unsigned transaction class
"""

import mmgen.tx.unsigned as TxBase
from .completed import Completed
from ....obj import CoinTxID,MMGenDict
from ....util import msg,msg_r,ymsg,suf,die

class Unsigned(Completed,TxBase.Unsigned):
	desc = 'unsigned transaction'

	async def sign(self,tx_num_str,keys): # return signed object or False; don't exit or raise exception

		from ....exception import TransactionChainMismatch
		try:
			self.check_correct_chain()
		except TransactionChainMismatch:
			return False

		if (self.has_segwit_inputs() or self.has_segwit_outputs()) and not self.proto.cap('segwit'):
			ymsg(f"TX has Segwit inputs or outputs, but {self.coin} doesn't support Segwit!")
			return False

		self.check_pubkey_scripts()

		self.cfg._util.qmsg(f'Passing {len(keys)} key{suf(keys)} to {self.rpc.daemon.exec_fn}')

		if self.has_segwit_inputs():
			from ....addrgen import KeyGenerator,AddrGenerator
			kg = KeyGenerator( self.cfg, self.proto, 'std' )
			ag = AddrGenerator( self.cfg, self.proto, 'segwit' )
			keydict = MMGenDict([(d.addr,d.sec) for d in keys])

		sig_data = []
		for d in self.inputs:
			e = {k:getattr(d,k) for k in ('txid','vout','scriptPubKey','amt')}
			e['amount'] = e['amt']
			del e['amt']
			if d.mmtype == 'S':
				e['redeemScript'] = ag.to_segwit_redeem_script(kg.gen_data(keydict[d.addr]))
			sig_data.append(e)

		msg_r(f'Signing transaction{tx_num_str}...')
		wifs = [d.sec.wif for d in keys]

		try:
			args = (
				('signrawtransaction',       self.serialized,sig_data,wifs,self.proto.sighash_type),
				('signrawtransactionwithkey',self.serialized,wifs,sig_data,self.proto.sighash_type)
			)['sign_with_key' in self.rpc.caps]
			ret = await self.rpc.call(*args)
		except Exception as e:
			ymsg(self.rpc.daemon.sigfail_errmsg(e))
			return False

		from ....tx import SignedTX

		try:
			self.update_serialized(ret['hex'])
			new = await SignedTX(cfg=self.cfg,data=self.__dict__)
			tx_decoded = await self.rpc.call( 'decoderawtransaction', ret['hex'] )
			new.compare_size_and_estimated_size(tx_decoded)
			new.coin_txid = CoinTxID(self.deserialized.txid)
			if not new.coin_txid == tx_decoded['txid']:
				die( 'BadMMGenTxID', 'txid mismatch (after signing)' )
			msg('OK')
			return new
		except Exception as e:
			ymsg(f'\n{e.args[0]}')
			if self.cfg.exec_wrapper:
				import sys,traceback
				ymsg( '\n' + ''.join(traceback.format_exception(*sys.exc_info())) )
			return False