Basic Atomic Swap Proof of Concept
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5 years ago
# -*- coding: utf-8 -*-
# Copyright (c) 2019 tecnovert
# Distributed under the MIT software license, see the accompanying
# file LICENSE.txt or http://www.opensource.org/licenses/mit-license.php.
import os
import json
import time
import struct
import traceback
import threading
import http.client
import urllib.parse
from http.server import BaseHTTPRequestHandler, HTTPServer
from .util import (
COIN,
format8,
)
from .chainparams import (
chainparams,
Coins,
)
from .basicswap import (
SwapTypes,
getOfferState,
getBidState,
getTxState,
getLockName,
)
def getCoinName(c):
return chainparams[c]['name'].capitalize()
def html_content_start(title, h2=None):
content = '<!DOCTYPE html><html lang="en">\n<head>' \
+ '<meta charset="UTF-8">' \
+ '<title>' + title + '</title></head>' \
+ '<body>'
if h2 is not None:
content += '<h2>' + h2 + '</h2>'
return content
class HttpHandler(BaseHTTPRequestHandler):
def page_error(self, error_str):
content = html_content_start('BasicSwap Error') \
+ '<p>Error: ' + error_str + '</p>' \
+ '<p><a href=\'/\'>home</a></p></body></html>'
return bytes(content, 'UTF-8')
def js_error(self, error_str):
error_str_json = json.dumps({'error': error_str})
return bytes(error_str_json, 'UTF-8')
def js_wallets(self, url_split):
return bytes(json.dumps(self.server.swap_client.getWalletsInfo()), 'UTF-8')
def js_offers(self, url_split):
assert(False), 'TODO'
return bytes(json.dumps(self.server.swap_client.listOffers()), 'UTF-8')
def js_sentoffers(self, url_split):
assert(False), 'TODO'
return bytes(json.dumps(self.server.swap_client.listOffers(sent=True)), 'UTF-8')
def js_bids(self, url_split):
if len(url_split) > 3:
bid_id = bytes.fromhex(url_split[3])
assert(len(bid_id) == 28)
return bytes(json.dumps(self.server.swap_client.viewBid(bid_id)), 'UTF-8')
return bytes(json.dumps(self.server.swap_client.listBids()), 'UTF-8')
def js_sentbids(self, url_split):
return bytes(json.dumps(self.server.swap_client.listBids(sent=True)), 'UTF-8')
def js_index(self, url_split):
return bytes(json.dumps(self.server.swap_client.getSummary()), 'UTF-8')
def page_active(self, url_split, post_string):
swap_client = self.server.swap_client
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>Active Swaps</h3>'
active_swaps = swap_client.listSwapsInProgress()
content += '<table>'
content += '<tr><th>Bid ID</th><th>Offer ID</th><th>Bid Status</th></tr>'
for s in active_swaps:
content += '<tr><td><a href=/bid/{0}>{0}</a></td><td><a href=/offer/{1}>{1}</a></td><td>{2}</td></tr>'.format(s[0].hex(), s[1], getBidState(s[2]))
content += '</table>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_wallets(self, url_split, post_string):
swap_client = self.server.swap_client
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>Wallets</h3>'
if post_string != '':
form_data = urllib.parse.parse_qs(post_string)
form_id = form_data[b'formid'][0].decode('utf-8')
if self.server.last_form_id.get('wallets', None) == form_id:
content += '<p>Prevented double submit for form {}.</p>'.format(form_id)
else:
self.server.last_form_id['wallets'] = form_id
for c in Coins:
cid = str(int(c))
if bytes('newaddr_' + cid, 'utf-8') in form_data:
swap_client.cacheNewAddressForCoin(c)
if bytes('withdraw_' + cid, 'utf-8') in form_data:
value = form_data[bytes('amt_' + cid, 'utf-8')][0].decode('utf-8')
address = form_data[bytes('to_' + cid, 'utf-8')][0].decode('utf-8')
txid = swap_client.withdrawCoin(c, value, address)
ticker = swap_client.getTicker(c)
content += '<p>Withdrew {} {} to address {}<br/>In txid: {}</p>'.format(value, ticker, address, txid)
wallets = swap_client.getWalletsInfo()
content += '<form method="post">'
for k, w in wallets.items():
cid = str(int(k))
content += '<h4>' + w['name'] + '</h4>' \
+ '<table>' \
+ '<tr><td>Balance:</td><td>' + str(w['balance']) + '</td></tr>' \
+ '<tr><td>Blocks:</td><td>' + str(w['blocks']) + '</td></tr>' \
+ '<tr><td>Synced:</td><td>' + str(w['synced']) + '</td></tr>' \
+ '<tr><td><input type="submit" name="newaddr_' + cid + '" value="Deposit Address"></td><td>' + str(w['deposit_address']) + '</td></tr>' \
+ '<tr><td><input type="submit" name="withdraw_' + cid + '" value="Withdraw"></td><td>Amount: <input type="text" name="amt_' + cid + '"></td><td>Address: <input type="text" name="to_' + cid + '"></td></tr>' \
+ '</table>'
content += '<input type="hidden" name="formid" value="' + os.urandom(8).hex() + '"></form>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def make_coin_select(self, name, coins):
s = '<select name="' + name + '"><option value="-1">-- Select Coin --</option>'
for c in coins:
s += '<option value="{}">{}</option>'.format(*c)
s += '</select>'
return s
def page_newoffer(self, url_split, post_string):
swap_client = self.server.swap_client
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>New Offer</h3>'
if post_string != '':
form_data = urllib.parse.parse_qs(post_string)
form_id = form_data[b'formid'][0].decode('utf-8')
if self.server.last_form_id.get('newoffer', None) == form_id:
content += '<p>Prevented double submit for form {}.</p>'.format(form_id)
else:
self.server.last_form_id['newoffer'] = form_id
try:
coin_from = Coins(int(form_data[b'coin_from'][0]))
except Exception:
raise ValueError('Unknown Coin From')
try:
coin_to = Coins(int(form_data[b'coin_to'][0]))
except Exception:
raise ValueError('Unknown Coin From')
value_from = int(float(form_data[b'amt_from'][0]) * COIN)
value_to = int(float(form_data[b'amt_to'][0]) * COIN)
min_bid = int(value_from)
rate = int((value_to / value_from) * COIN)
autoaccept = True if b'autoaccept' in form_data else False
# TODO: More accurate rate
# assert(value_to == (value_from * rate) // COIN)
offer_id = swap_client.postOffer(coin_from, coin_to, value_from, rate, min_bid, SwapTypes.SELLER_FIRST, auto_accept_bids=autoaccept)
content += '<p><a href="/offer/' + offer_id.hex() + '">Sent Offer ' + offer_id.hex() + '</a><br/>Rate: ' + format8(rate) + '</p>'
coins = []
for k, v in swap_client.coin_clients.items():
if v['connection_type'] == 'rpc':
coins.append((int(k), getCoinName(k)))
content += '<form method="post">'
content += '<table>'
content += '<tr><td>Coin From</td><td>' + self.make_coin_select('coin_from', coins) + '</td><td>Amount From</td><td><input type="text" name="amt_from"></td></tr>'
content += '<tr><td>Coin To</td><td>' + self.make_coin_select('coin_to', coins) + '</td><td>Amount To</td><td><input type="text" name="amt_to"></td></tr>'
content += '<tr><td>Auto Accept Bids</td><td><input type="checkbox" name="autoaccept" value="aa" checked></td></tr>'
content += '</table>'
content += '<input type="submit" value="Submit">'
content += '<input type="hidden" name="formid" value="' + os.urandom(8).hex() + '"></form>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_offer(self, url_split, post_string):
assert(len(url_split) > 2), 'Offer ID not specified'
try:
offer_id = bytes.fromhex(url_split[2])
assert(len(offer_id) == 28)
except Exception:
raise ValueError('Bad offer ID')
swap_client = self.server.swap_client
offer = swap_client.getOffer(offer_id)
assert(offer), 'Unknown offer ID'
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>Offer: ' + offer_id.hex() + '</h3>'
if post_string != '':
form_data = urllib.parse.parse_qs(post_string)
form_id = form_data[b'formid'][0].decode('utf-8')
if self.server.last_form_id.get('offer', None) == form_id:
content += '<p>Prevented double submit for form {}.</p>'.format(form_id)
else:
self.server.last_form_id['offer'] = form_id
bid_id = swap_client.postBid(offer_id, offer.amount_from)
content += '<p><a href="/bid/' + bid_id.hex() + '">Sent Bid ' + bid_id.hex() + '</a></p>'
coin_from = Coins(offer.coin_from)
coin_to = Coins(offer.coin_to)
ticker_from = swap_client.getTicker(coin_from)
ticker_to = swap_client.getTicker(coin_to)
tr = '<tr><td>{}</td><td>{}</td></tr>'
content += '<table>'
content += tr.format('Offer State', getOfferState(offer.state))
content += tr.format('Coin From', getCoinName(coin_from))
content += tr.format('Coin To', getCoinName(coin_to))
content += tr.format('Amount From', format8(offer.amount_from) + ' ' + ticker_from)
content += tr.format('Amount To', format8((offer.amount_from * offer.rate) // COIN) + ' ' + ticker_to)
content += tr.format('Rate', format8(offer.rate) + ' ' + ticker_from + '/' + ticker_to)
content += tr.format('Script Lock Type', getLockName(offer.lock_type))
content += tr.format('Script Lock Value', offer.lock_value)
content += tr.format('Address From', offer.addr_from)
content += tr.format('Created At', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(offer.created_at)))
content += tr.format('Expired At', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(offer.expire_at)))
content += tr.format('Sent', 'True' if offer.was_sent else 'False')
if offer.was_sent:
content += tr.format('Auto Accept Bids', 'True' if offer.auto_accept_bids else 'False')
content += '</table>'
bids = swap_client.listBids(offer_id=offer_id)
content += '<h4>Bids</h4><table>'
content += '<tr><th>Bid ID</th><th>Bid Amount</th><th>Bid Status</th><th>ITX Status</th><th>PTX Status</th></tr>'
for b in bids:
content += '<tr><td><a href=/bid/{0}>{0}</a></td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>'.format(b.bid_id.hex(), format8(b.amount), getBidState(b.state), getTxState(b.initiate_txn_state), getTxState(b.participate_txn_state))
content += '</table>'
content += '<form method="post">'
content += '<input type="submit" value="Send Bid">'
content += '<input type="hidden" name="formid" value="' + os.urandom(8).hex() + '"></form>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_offers(self, url_split, sent=False):
swap_client = self.server.swap_client
offers = swap_client.listOffers(sent)
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>' + ('Sent ' if sent else '') + 'Offers</h3>'
content += '<table>'
content += '<tr><th>Offer ID</th><th>Coin From</th><th>Coin To</th><th>Amount From</th><th>Amount To</th><th>Rate</th></tr>'
for o in offers:
coin_from_name = getCoinName(Coins(o.coin_from))
coin_to_name = getCoinName(Coins(o.coin_to))
amount_to = (o.amount_from * o.rate) // COIN
content += '<tr><td><a href=/offer/{0}>{0}</a></td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td><td>{5}</td></tr>'.format(o.offer_id.hex(), coin_from_name, coin_to_name, format8(o.amount_from), format8(amount_to), format8(o.rate))
content += '</table>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_bid(self, url_split, post_string):
assert(len(url_split) > 2), 'Bid ID not specified'
try:
bid_id = bytes.fromhex(url_split[2])
assert(len(bid_id) == 28)
except Exception:
raise ValueError('Bad bid ID')
swap_client = self.server.swap_client
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>Bid: ' + bid_id.hex() + '</h3>'
show_txns = False
if post_string != '':
form_data = urllib.parse.parse_qs(post_string)
form_id = form_data[b'formid'][0].decode('utf-8')
if self.server.last_form_id.get('bid', None) == form_id:
content += '<p>Prevented double submit for form {}.</p>'.format(form_id)
else:
self.server.last_form_id['bid'] = form_id
if b'abandon_bid' in form_data:
try:
swap_client.abandonBid(bid_id)
content += '<p>Bid abandoned</p>'
except Exception as e:
content += '<p>Error' + str(e) + '</p>'
if b'accept_bid' in form_data:
try:
swap_client.acceptBid(bid_id)
content += '<p>Bid accepted</p>'
except Exception as e:
content += '<p>Error' + str(e) + '</p>'
if b'show_txns' in form_data:
show_txns = True
bid, offer = swap_client.getBidAndOffer(bid_id)
assert(bid), 'Unknown bid ID'
coin_from = Coins(offer.coin_from)
coin_to = Coins(offer.coin_to)
ticker_from = swap_client.getTicker(coin_from)
ticker_to = swap_client.getTicker(coin_to)
tr = '<tr><td>{}</td><td>{}</td></tr>'
content += '<table>'
content += tr.format('Swap', format8(bid.amount) + ' ' + ticker_from + ' for ' + format8((bid.amount * offer.rate) // COIN) + ' ' + ticker_to)
content += tr.format('Bid State', getBidState(bid.state))
content += tr.format('ITX State', getTxState(bid.initiate_txn_state))
content += tr.format('PTX State', getTxState(bid.participate_txn_state))
content += tr.format('Offer', '<a href="/offer/' + bid.offer_id.hex() + '">' + bid.offer_id.hex() + '</a>')
content += tr.format('Address From', bid.bid_addr)
content += tr.format('Proof of Funds', bid.proof_address)
content += tr.format('Created At', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(bid.created_at)))
content += tr.format('Expired At', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(bid.expire_at)))
content += tr.format('Sent', 'True' if bid.was_sent else 'False')
content += tr.format('Received', 'True' if bid.was_received else 'False')
content += tr.format('Initiate Tx', 'None' if not bid.initiate_txid else (bid.initiate_txid.hex() + ' ' + ticker_from))
5 years ago
content += tr.format('Initiate Conf', 'None' if not bid.initiate_txn_conf else bid.initiate_txn_conf)
content += tr.format('Participate Tx', 'None' if not bid.participate_txid else (bid.participate_txid.hex() + ' ' + ticker_to))
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content += tr.format('Participate Conf', 'None' if not bid.participate_txn_conf else bid.participate_txn_conf)
if show_txns:
content += tr.format('Initiate Tx Refund', 'None' if not bid.initiate_txn_refund else bid.initiate_txn_refund.hex())
content += tr.format('Participate Tx Refund', 'None' if not bid.participate_txn_refund else bid.participate_txn_refund.hex())
content += tr.format('Initiate Spend Tx', 'None' if not bid.initiate_spend_txid else (bid.initiate_spend_txid.hex() + ' {}'.format(bid.initiate_spend_n)))
content += tr.format('Participate Spend Tx', 'None' if not bid.participate_spend_txid else (bid.participate_spend_txid.hex() + ' {}'.format(bid.participate_spend_n)))
content += '</table>'
content += '<form method="post">'
if bid.was_received:
content += '<input name="accept_bid" type="submit" value="Accept Bid"><br/>'
content += '<input name="abandon_bid" type="submit" value="Abandon Bid">'
content += '<input name="show_txns" type="submit" value="Show More Info">'
content += '<input type="hidden" name="formid" value="' + os.urandom(8).hex() + '"></form>'
content += '<h4>Old States</h4><table><tr><th>State</th><th>Set At</th></tr>'
num_states = len(bid.states) // 12
for i in range(num_states):
up = struct.unpack_from('<iq', bid.states[i * 12:(i + 1) * 12])
content += '<tr><td>Bid {}</td><td>{}</td></tr>'.format(getBidState(up[0]), time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(up[1])))
if bid.initiate_txn_states is not None:
num_states = len(bid.initiate_txn_states) // 12
for i in range(num_states):
up = struct.unpack_from('<iq', bid.initiate_txn_states[i * 12:(i + 1) * 12])
content += '<tr><td>ITX {}</td><td>{}</td></tr>'.format(getTxState(up[0]), time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(up[1])))
if bid.participate_txn_states is not None:
num_states = len(bid.participate_txn_states) // 12
for i in range(num_states):
up = struct.unpack_from('<iq', bid.participate_txn_states[i * 12:(i + 1) * 12])
content += '<tr><td>PTX {}</td><td>{}</td></tr>'.format(getTxState(up[0]), time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(up[1])))
content += '</table>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_bids(self, url_split, post_string, sent=False):
swap_client = self.server.swap_client
bids = swap_client.listBids(sent=sent)
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>' + ('Sent ' if sent else '') + 'Bids</h3>'
content += '<table>'
content += '<tr><th>Bid ID</th><th>Offer ID</th><th>Bid Status</th><th>ITX Status</th><th>PTX Status</th></tr>'
for b in bids:
content += '<tr><td><a href=/bid/{0}>{0}</a></td><td><a href=/offer/{1}>{1}</a></td><td>{2}</td><td>{3}</td><td>{4}</td></tr>'.format(b.bid_id.hex(), b.offer_id.hex(), getBidState(b.state), getTxState(b.initiate_txn_state), getTxState(b.participate_txn_state))
content += '</table>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_watched(self, url_split, post_string):
swap_client = self.server.swap_client
watched_outputs, last_scanned = swap_client.listWatchedOutputs()
content = html_content_start(self.server.title, self.server.title) \
+ '<h3>Watched Outputs</h3>'
for c in last_scanned:
content += '<p>' + getCoinName(c[0]) + ' Scanned Height: ' + str(c[1]) + '</p>'
content += '<table>'
content += '<tr><th>Bid ID</th><th>Chain</th><th>Txid</th><th>Index</th><th>Type</th></tr>'
for o in watched_outputs:
content += '<tr><td><a href=/bid/{0}>{0}</a></td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>'.format(o[1].hex(), getCoinName(o[0]), o[2], o[3], int(o[4]))
content += '</table>'
content += '<p><a href="/">home</a></p></body></html>'
return bytes(content, 'UTF-8')
def page_index(self, url_split):
swap_client = self.server.swap_client
summary = swap_client.getSummary()
content = html_content_start(self.server.title, self.server.title) \
+ '<p><a href="/wallets">View Wallets</a></p>' \
+ '<p>' \
+ 'Network: ' + str(summary['network']) + '<br/>' \
+ '<a href="/active">Swaps in progress: ' + str(summary['num_swapping']) + '</a><br/>' \
+ '<a href="/offers">Network Offers: ' + str(summary['num_network_offers']) + '</a><br/>' \
+ '<a href="/sentoffers">Sent Offers: ' + str(summary['num_sent_offers']) + '</a><br/>' \
+ '<a href="/bids">Received Bids: ' + str(summary['num_recv_bids']) + '</a><br/>' \
+ '<a href="/sentbids">Sent Bids: ' + str(summary['num_sent_bids']) + '</a><br/>' \
+ '<a href="/watched">Watched Outputs: ' + str(summary['num_watched_outputs']) + '</a><br/>' \
+ '</p>' \
+ '<p>' \
+ '<a href="/newoffer">New Offer</a><br/>' \
+ '</p>'
content += '</body></html>'
return bytes(content, 'UTF-8')
def putHeaders(self, status_code, content_type):
self.send_response(status_code)
if self.server.allow_cors:
self.send_header('Access-Control-Allow-Origin', '*')
self.send_header('Content-type', content_type)
self.end_headers()
def handle_http(self, status_code, path, post_string=''):
url_split = self.path.split('/')
if len(url_split) > 1 and url_split[1] == 'json':
try:
self.putHeaders(status_code, 'text/plain')
func = self.js_index
if len(url_split) > 2:
func = {'wallets': self.js_wallets,
'offers': self.js_offers,
'sentoffers': self.js_sentoffers,
'bids': self.js_bids,
'sentbids': self.js_sentbids,
}.get(url_split[2], self.js_index)
return func(url_split)
except Exception as e:
return self.js_error(str(e))
try:
self.putHeaders(status_code, 'text/html')
if len(url_split) > 1:
if url_split[1] == 'active':
return self.page_active(url_split, post_string)
if url_split[1] == 'wallets':
return self.page_wallets(url_split, post_string)
if url_split[1] == 'offer':
return self.page_offer(url_split, post_string)
if url_split[1] == 'offers':
return self.page_offers(url_split)
if url_split[1] == 'newoffer':
return self.page_newoffer(url_split, post_string)
if url_split[1] == 'sentoffers':
return self.page_offers(url_split, sent=True)
if url_split[1] == 'bid':
return self.page_bid(url_split, post_string)
if url_split[1] == 'bids':
return self.page_bids(url_split, post_string)
if url_split[1] == 'sentbids':
return self.page_bids(url_split, post_string, sent=True)
if url_split[1] == 'watched':
return self.page_watched(url_split, post_string)
return self.page_index(url_split)
except Exception as e:
traceback.print_exc() # TODO: Remove
return self.page_error(str(e))
def do_GET(self):
response = self.handle_http(200, self.path)
self.wfile.write(response)
def do_POST(self):
post_string = self.rfile.read(int(self.headers['Content-Length']))
response = self.handle_http(200, self.path, post_string)
self.wfile.write(response)
def do_HEAD(self):
self.putHeaders(200, 'text/html')
def do_OPTIONS(self):
self.send_response(200, 'ok')
if self.server.allow_cors:
self.send_header('Access-Control-Allow-Origin', '*')
self.send_header('Access-Control-Allow-Headers', '*')
self.end_headers()
class HttpThread(threading.Thread, HTTPServer):
def __init__(self, fp, host_name, port_no, allow_cors, swap_client):
threading.Thread.__init__(self)
self.stop_event = threading.Event()
self.fp = fp
self.host_name = host_name
self.port_no = port_no
self.allow_cors = allow_cors
self.swap_client = swap_client
self.title = 'Simple Atomic Swap Demo'
self.last_form_id = dict()
self.timeout = 60
HTTPServer.__init__(self, (self.host_name, self.port_no), HttpHandler)
def stop(self):
self.stop_event.set()
# Send fake request
conn = http.client.HTTPConnection(self.host_name, self.port_no)
conn.connect()
conn.request('GET', '/none')
response = conn.getresponse()
data = response.read()
conn.close()
def stopped(self):
return self.stop_event.is_set()
def serve_forever(self):
while not self.stopped():
self.handle_request()
self.socket.close()
def run(self):
self.serve_forever()