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140 lines
4.9 KiB
140 lines
4.9 KiB
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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import binascii
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from decimal import Decimal
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import requests
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import json
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from . import types_pb2 as proto_types
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class TxApi(object):
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def __init__(self, network, url):
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self.network = network
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self.url = url
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def fetch_json(self, url, resource, resourceid):
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cachefile = '%s_%s_%s' % (self.network, resource, resourceid)
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try: # looking into cache first
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j = json.load(open('txcache/' + cachefile))
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return j
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except:
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pass
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try:
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r = requests.get('%s/%s/%s' % (self.url, resource, resourceid), headers={'User-agent': 'Mozilla/5.0'})
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j = r.json()
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except:
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raise Exception('URL error: %s' % url)
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try: # saving into cache
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json.dump(j, open('txcache/' + cachefile, 'w'))
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except:
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pass
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return j
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def get_tx(self, txhash):
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raise NotImplementedError
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class TxApiInsight(TxApi):
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def __init__(self, network, url, zcash=None):
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super(TxApiInsight, self).__init__(network, url)
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self.zcash = zcash
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def get_tx(self, txhash):
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data = self.fetch_json(self.url, 'tx', txhash)
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t = proto_types.TransactionType()
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t.version = data['version']
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t.lock_time = data['locktime']
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for vin in data['vin']:
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i = t.inputs.add()
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if 'coinbase' in vin.keys():
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i.prev_hash = b"\0"*32
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i.prev_index = 0xffffffff # signed int -1
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i.script_sig = binascii.unhexlify(vin['coinbase'])
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i.sequence = vin['sequence']
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else:
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i.prev_hash = binascii.unhexlify(vin['txid'])
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i.prev_index = vin['vout']
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i.script_sig = binascii.unhexlify(vin['scriptSig']['hex'])
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i.sequence = vin['sequence']
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for vout in data['vout']:
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o = t.bin_outputs.add()
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o.amount = int(Decimal(str(vout['value'])) * 100000000)
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o.script_pubkey = binascii.unhexlify(vout['scriptPubKey']['hex'])
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if self.zcash:
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if t.version == 2:
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joinsplit_cnt = len(data['vjoinsplit'])
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if joinsplit_cnt == 0:
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t.extra_data =b'\x00'
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else:
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extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64 # we assume cnt < 253, so we can treat varIntLen(cnt) as 1
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raw = fetch_json(self.url, 'rawtx', txhash)
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raw = binascii.unhexlify(raw['rawtx'])
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t.extra_data = raw[-extra_data_len:]
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return t
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class TxApiSmartbit(TxApi):
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def get_tx(self, txhash):
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data = self.fetch_json(self.url, 'tx', txhash)
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data = data['transaction']
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t = proto_types.TransactionType()
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t.version = int(data['version'])
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t.lock_time = data['locktime']
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for vin in data['inputs']:
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i = t.inputs.add()
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if 'coinbase' in vin.keys():
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i.prev_hash = b"\0"*32
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i.prev_index = 0xffffffff # signed int -1
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i.script_sig = binascii.unhexlify(vin['coinbase'])
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i.sequence = vin['sequence']
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else:
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i.prev_hash = binascii.unhexlify(vin['txid'])
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i.prev_index = vin['vout']
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i.script_sig = binascii.unhexlify(vin['script_sig']['hex'])
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i.sequence = vin['sequence']
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for vout in data['outputs']:
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o = t.bin_outputs.add()
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o.amount = int(Decimal(vout['value']) * 100000000)
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o.script_pubkey = binascii.unhexlify(vout['script_pub_key']['hex'])
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return t
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TxApiBitcoin = TxApiInsight(network='insight_bitcoin', url='https://insight.bitpay.com/api/')
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TxApiTestnet = TxApiInsight(network='insight_testnet', url='https://test-insight.bitpay.com/api/')
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TxApiSegnet = TxApiSmartbit(network='smartbit_segnet', url='https://segnet-api.smartbit.com.au/v1/blockchain/')
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TxApiZcashTestnet = TxApiInsight(network='insight_zcashtestnet', url='https://explorer.testnet.z.cash/api/', zcash=True)
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