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mirror of https://github.com/trezor/trezor-firmware.git synced 2024-11-30 11:28:21 +00:00
trezor-firmware/trezorlib/tx_api.py

121 lines
4.0 KiB
Python

import binascii
from decimal import Decimal
import requests
import json
from . import types_pb2 as proto_types
class TxApi(object):
def __init__(self, network, url):
self.network = network
self.url = url
def fetch_json(self, url, resource, resourceid):
cachefile = '%s_%s_%s' % (self.network, resource, resourceid)
try: # looking into cache first
j = json.load(open('txcache/' + cachefile))
return j
except:
pass
try:
r = requests.get('%s/%s/%s' % (self.url, resource, resourceid), headers={'User-agent': 'Mozilla/5.0'})
j = r.json()
except:
raise Exception('URL error: %s' % url)
try: # saving into cache
json.dump(j, open('txcache/' + cachefile, 'w'))
except:
pass
return j
def get_tx(self, txhash):
raise NotImplementedError
class TxApiInsight(TxApi):
def __init__(self, network, url, zcash=None):
super(TxApiInsight, self).__init__(network, url)
self.zcash = zcash
def get_tx(self, txhash):
data = self.fetch_json(self.url, 'tx', txhash)
t = proto_types.TransactionType()
t.version = data['version']
t.lock_time = data['locktime']
for vin in data['vin']:
i = t.inputs.add()
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.bin_outputs.add()
o.amount = int(Decimal(str(vout['value'])) * 100000000)
o.script_pubkey = binascii.unhexlify(vout['scriptPubKey']['hex'])
if self.zcash:
if t.version == 2:
joinsplit_cnt = len(data['vjoinsplit'])
if joinsplit_cnt == 0:
t.extra_data =b'\x00'
else:
extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64 # we assume cnt < 253, so we can treat varIntLen(cnt) as 1
raw = fetch_json(self.url, 'rawtx', txhash)
raw = binascii.unhexlify(raw['rawtx'])
t.extra_data = raw[-extra_data_len:]
return t
class TxApiSmartbit(TxApi):
def get_tx(self, txhash):
data = self.fetch_json(self.url, 'tx', txhash)
data = data['transaction']
t = proto_types.TransactionType()
t.version = int(data['version'])
t.lock_time = data['locktime']
for vin in data['inputs']:
i = t.inputs.add()
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['script_sig']['hex'])
i.sequence = vin['sequence']
for vout in data['outputs']:
o = t.bin_outputs.add()
o.amount = int(Decimal(vout['value']) * 100000000)
o.script_pubkey = binascii.unhexlify(vout['script_pub_key']['hex'])
return t
TxApiBitcoin = TxApiInsight(network='insight_bitcoin', url='https://insight.bitpay.com/api/')
TxApiTestnet = TxApiInsight(network='insight_testnet', url='https://test-insight.bitpay.com/api/')
TxApiSegnet = TxApiSmartbit(network='smartbit_segnet', url='https://segnet-api.smartbit.com.au/v1/blockchain/')
TxApiZcashTestnet = TxApiInsight(network='insight_zcashtestnet', url='https://explorer.testnet.z.cash/api/', zcash=True)