mirror of
https://github.com/trezor/trezor-firmware.git
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54f1599a5a
This clarifies the intent: the project is licenced under terms of LGPL version 3 only, but the standard headers cover only "3 or later", so we had to rewrite them. In the same step, we removed author information from individual files in favor of "SatoshiLabs and contributors", and include an AUTHORS file that lists the contributors. Apologies to those whose names are missing; please contact us if you wish to add your info to the AUTHORS file.
150 lines
5.0 KiB
Python
150 lines
5.0 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 SatoshiLabs and contributors
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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 version 3
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# as published by the Free Software Foundation.
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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 License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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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 messages as proto
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cache_dir = None
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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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self.pushtx_url = url
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def get_url(self, resource, resourceid):
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url = '%s%s/%s' % (self.url, resource, resourceid)
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return url
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def fetch_json(self, resource, resourceid):
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global cache_dir
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if cache_dir:
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cache_file = '%s/%s_%s_%s.json' % (cache_dir, self.network, resource, resourceid)
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try: # looking into cache first
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j = json.load(open(cache_file), parse_float=str)
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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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url = self.get_url(resource, resourceid)
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r = requests.get(url, headers={'User-agent': 'Mozilla/5.0'})
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j = r.json(parse_float=str)
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except:
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raise RuntimeError('URL error: %s' % url)
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if cache_dir and cache_file:
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try: # saving into cache
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json.dump(j, open(cache_file, '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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self.pushtx_url = url.replace('/api/', '/tx/send')
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def get_tx(self, txhash):
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data = self.fetch_json('tx', txhash)
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t = proto.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._add_inputs()
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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._add_bin_outputs()
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o.amount = int(Decimal(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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t.overwintered = data.get('fOverwintered', False)
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t.expiry = data.get('nExpiryHeight', False)
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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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if joinsplit_cnt >= 253:
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# we assume cnt < 253, so we can treat varIntLen(cnt) as 1
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raise ValueError('Too many joinsplits')
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extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64
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raw = self.fetch_json('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 TxApiBlockCypher(TxApi):
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def __init__(self, network, url, zcash=None):
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super(TxApiBlockCypher, self).__init__(network, url)
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self.pushtx_url = url.replace('//api.', '//live.').replace('/v1/', '/').replace('/main/', '/pushtx/')
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def get_tx(self, txhash):
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data = self.fetch_json('txs', txhash)
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t = proto.TransactionType()
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t.version = data['ver']
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t.lock_time = data.get('lock_time', 0)
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for vin in data['inputs']:
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i = t._add_inputs()
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if 'prev_hash' not in vin:
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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['script'])
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i.sequence = vin['sequence']
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else:
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i.prev_hash = binascii.unhexlify(vin['prev_hash'])
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i.prev_index = vin['output_index']
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i.script_sig = binascii.unhexlify(vin['script'])
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i.sequence = vin['sequence']
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for vout in data['outputs']:
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o = t._add_bin_outputs()
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o.amount = int(str(vout['value']), 10)
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o.script_pubkey = binascii.unhexlify(vout['script'])
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return t
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