#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2014 Thomas Voegtlin
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import socket
import threading
import time
from xmlrpc.client import ServerProxy
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import QPushButton
from electrum import bitcoin, util
from electrum import transaction
from electrum.plugins import BasePlugin, hook
from electrum.i18n import _
from electrum.wallet import Multisig_Wallet
from electrum.util import bh2u
from electrum_gui.qt.transaction_dialog import show_transaction
import sys
import traceback
PORT = 12344
HOST = 'cosigner.electrum.org'
server = ServerProxy('http://%s:%d'%(HOST,PORT), allow_none=True)
class Listener(util.DaemonThread):
def __init__(self, parent):
util.DaemonThread.__init__(self)
self.daemon = True
self.parent = parent
self.received = set()
self.keyhashes = []
def set_keyhashes(self, keyhashes):
self.keyhashes = keyhashes
def clear(self, keyhash):
server.delete(keyhash)
self.received.remove(keyhash)
def run(self):
while self.running:
if not self.keyhashes:
time.sleep(2)
continue
for keyhash in self.keyhashes:
if keyhash in self.received:
continue
try:
message = server.get(keyhash)
except Exception as e:
self.print_error("cannot contact cosigner pool")
time.sleep(30)
continue
if message:
self.received.add(keyhash)
self.print_error("received message for", keyhash)
self.parent.obj.cosigner_receive_signal.emit(
keyhash, message)
# poll every 30 seconds
time.sleep(30)
class QReceiveSignalObject(QObject):
cosigner_receive_signal = pyqtSignal(object, object)
class Plugin(BasePlugin):
def __init__(self, parent, config, name):
BasePlugin.__init__(self, parent, config, name)
self.listener = None
self.obj = QReceiveSignalObject()
self.obj.cosigner_receive_signal.connect(self.on_receive)
self.keys = []
self.cosigner_list = []
@hook
def init_qt(self, gui):
for window in gui.windows:
self.on_new_window(window)
@hook
def on_new_window(self, window):
self.update(window)
@hook
def on_close_window(self, window):
self.update(window)
def is_available(self):
return True
def update(self, window):
wallet = window.wallet
if type(wallet) != Multisig_Wallet:
return
if self.listener is None:
self.print_error("starting listener")
self.listener = Listener(self)
self.listener.start()
elif self.listener:
self.print_error("shutting down listener")
self.listener.stop()
self.listener = None
self.keys = []
self.cosigner_list = []
for key, keystore in wallet.keystores.items():
xpub = keystore.get_master_public_key()
K = bitcoin.deserialize_xpub(xpub)[-1]
_hash = bh2u(bitcoin.Hash(K))
if not keystore.is_watching_only():
self.keys.append((key, _hash, window))
else:
self.cosigner_list.append((window, xpub, K, _hash))
if self.listener:
self.listener.set_keyhashes([t[1] for t in self.keys])
@hook
def transaction_dialog(self, d):
d.cosigner_send_button = b = QPushButton(_("Send to cosigner"))
b.clicked.connect(lambda: self.do_send(d.tx))
d.buttons.insert(0, b)
self.transaction_dialog_update(d)
@hook
def transaction_dialog_update(self, d):
if d.tx.is_complete() or d.wallet.can_sign(d.tx):
d.cosigner_send_button.hide()
return
for window, xpub, K, _hash in self.cosigner_list:
if window.wallet == d.wallet and self.cosigner_can_sign(d.tx, xpub):
d.cosigner_send_button.show()
break
else:
d.cosigner_send_button.hide()
def cosigner_can_sign(self, tx, cosigner_xpub):
from electrum.keystore import is_xpubkey, parse_xpubkey
xpub_set = set([])
for txin in tx.inputs():
for x_pubkey in txin['x_pubkeys']:
if is_xpubkey(x_pubkey):
xpub, s = parse_xpubkey(x_pubkey)
xpub_set.add(xpub)
return cosigner_xpub in xpub_set
def do_send(self, tx):
for window, xpub, K, _hash in self.cosigner_list:
if not self.cosigner_can_sign(tx, xpub):
continue
message = bitcoin.encrypt_message(tx.raw, K)
try:
server.put(_hash, message)
except Exception as e:
traceback.print_exc(file=sys.stdout)
window.show_message("Failed to send transaction to cosigning pool.")
return
window.show_message("Your transaction was sent to the cosigning pool.\nOpen your cosigner wallet to retrieve it.")
def on_receive(self, keyhash, message):
self.print_error("signal arrived for", keyhash)
for key, _hash, window in self.keys:
if _hash == keyhash:
break
else:
self.print_error("keyhash not found")
return
wallet = window.wallet
if wallet.has_password():
password = window.password_dialog('An encrypted transaction was retrieved from cosigning pool.\nPlease enter your password to decrypt it.')
if not password:
return
else:
password = None
if not window.question(_("An encrypted transaction was retrieved from cosigning pool.\nDo you want to open it now?")):
return
xprv = wallet.keystore.get_master_private_key(password)
if not xprv:
return
try:
k = bitcoin.deserialize_xprv(xprv)[-1].encode('hex')
EC = bitcoin.EC_KEY(k.decode('hex'))
message = EC.decrypt_message(message)
except Exception as e:
traceback.print_exc(file=sys.stdout)
window.show_message(str(e))
return
self.listener.clear(keyhash)
tx = transaction.Transaction(message)
show_transaction(tx, window, prompt_if_unsaved=True)