mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-28 02:18:20 +00:00
138 lines
5.0 KiB
Python
138 lines
5.0 KiB
Python
# This file is part of the Trezor project.
|
|
#
|
|
# Copyright (C) 2012-2018 SatoshiLabs and contributors
|
|
#
|
|
# This library is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License version 3
|
|
# as published by the Free Software Foundation.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the License along with this library.
|
|
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
|
|
|
|
import binascii
|
|
from decimal import Decimal
|
|
import requests
|
|
import json
|
|
|
|
from . import messages as proto
|
|
cache_dir = None
|
|
|
|
|
|
class TxApi(object):
|
|
|
|
def __init__(self, network, url=None):
|
|
self.network = network
|
|
self.url = url
|
|
|
|
def get_url(self, resource, resourceid):
|
|
url = '%s%s/%s' % (self.url, resource, resourceid)
|
|
return url
|
|
|
|
def current_height(self):
|
|
r = requests.get(self.url + '/status?q=getBlockCount')
|
|
j = r.json(parse_float=str)
|
|
block_height = j['info']['blocks']
|
|
return block_height
|
|
|
|
def get_block_hash(self, block_number):
|
|
r = requests.get(self.url + '/block-index/' + str(block_number))
|
|
j = r.json(parse_float=str)
|
|
block_hash = binascii.unhexlify(j['blockHash'])
|
|
return block_hash
|
|
|
|
def fetch_json(self, resource, resourceid):
|
|
global cache_dir
|
|
if cache_dir:
|
|
cache_file = '%s/%s_%s_%s.json' % (cache_dir, self.network, resource, resourceid)
|
|
try: # looking into cache first
|
|
j = json.load(open(cache_file), parse_float=str)
|
|
return j
|
|
except Exception:
|
|
pass
|
|
|
|
if not self.url:
|
|
raise RuntimeError("No URL specified and tx not in cache")
|
|
|
|
try:
|
|
url = self.get_url(resource, resourceid)
|
|
r = requests.get(url, headers={'User-agent': 'Mozilla/5.0'})
|
|
j = r.json(parse_float=str)
|
|
except Exception:
|
|
raise RuntimeError('URL error: %s' % url)
|
|
if cache_dir and cache_file:
|
|
try: # saving into cache
|
|
json.dump(j, open(cache_file, 'w'))
|
|
except Exception:
|
|
pass
|
|
return j
|
|
|
|
def get_tx(self, txhash):
|
|
raise NotImplementedError
|
|
|
|
|
|
class TxApiInsight(TxApi):
|
|
|
|
def __init__(self, network, url=None, zcash=None, bip115=False):
|
|
super().__init__(network, url)
|
|
self.zcash = zcash
|
|
self.bip115 = bip115
|
|
if url:
|
|
prefix, suffix = url.rsplit('/', maxsplit=1)
|
|
self.pushtx_url = prefix + '/tx/send'
|
|
|
|
def get_tx(self, txhash):
|
|
|
|
data = self.fetch_json('tx', txhash)
|
|
|
|
t = proto.TransactionType()
|
|
t.version = data['version']
|
|
t.lock_time = data['locktime']
|
|
|
|
for vin in data['vin']:
|
|
i = t._add_inputs()
|
|
if 'coinbase' in vin.keys():
|
|
i.prev_hash = b"\0" * 32
|
|
i.prev_index = 0xffffffff # signed int -1
|
|
i.script_sig = binascii.unhexlify(vin['coinbase'])
|
|
i.sequence = vin['sequence']
|
|
|
|
else:
|
|
i.prev_hash = binascii.unhexlify(vin['txid'])
|
|
i.prev_index = vin['vout']
|
|
i.script_sig = binascii.unhexlify(vin['scriptSig']['hex'])
|
|
i.sequence = vin['sequence']
|
|
|
|
for vout in data['vout']:
|
|
o = t._add_bin_outputs()
|
|
o.amount = int(Decimal(vout['value']) * 100000000)
|
|
o.script_pubkey = binascii.unhexlify(vout['scriptPubKey']['hex'])
|
|
if self.bip115 and o.script_pubkey[-1] == 0xb4:
|
|
# Verify if coin implements replay protection bip115 and script includes checkblockatheight opcode. 0xb4 - is op_code (OP_CHECKBLOCKATHEIGHT)
|
|
# <OP_32> <32-byte block hash> <OP_3> <3-byte block height> <OP_CHECKBLOCKATHEIGHT>
|
|
tail = o.script_pubkey[-38:]
|
|
o.block_hash = tail[1:33] # <32-byte block hash>
|
|
o.block_height = int.from_bytes(tail[34:37], byteorder='little') # <3-byte block height>
|
|
|
|
if self.zcash:
|
|
t.overwintered = data.get('fOverwintered', False)
|
|
t.expiry = data.get('nExpiryHeight', False)
|
|
if t.version >= 2:
|
|
joinsplit_cnt = len(data['vjoinsplit'])
|
|
if joinsplit_cnt == 0:
|
|
t.extra_data = b'\x00'
|
|
else:
|
|
if joinsplit_cnt >= 253:
|
|
# we assume cnt < 253, so we can treat varIntLen(cnt) as 1
|
|
raise ValueError('Too many joinsplits')
|
|
extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64
|
|
raw = self.fetch_json('rawtx', txhash)
|
|
raw = binascii.unhexlify(raw['rawtx'])
|
|
t.extra_data = raw[-extra_data_len:]
|
|
|
|
return t
|