# This file is part of the TREZOR project.

#

# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>

# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>

# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>

#

# This library is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# 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 GNU Lesser General Public License

# along with this library. If not, see <http://www.gnu.org/licenses/>.

import binascii

from decimal import Decimal

import requests

import json

import struct

from . import types_pb2 as proto_types

cache_dir = None

def pack_varint(n):

if n < 253:

return struct.pack("<B", n)

elif n <= 0xFFFF:

return struct.pack("<BH", 253, n)

elif n <= 0xFFFFFFFF:

return struct.pack("<BL", 254, n)

else:

return struct.pack("<BQ", 255, n)

class TxApi(object):

def __init__(self, network, url):

self.network = network

self.url = url

def fetch_json(self, url, 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

with open(cache_file) as f:

j = json.load(f)

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)

if cache_file:

try: # saving into cache

json.dump(j, open(cache_file, '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:

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(self.url, 'rawtx', txhash)

raw = binascii.unhexlify(raw['rawtx'])

t.extra_data = raw[-extra_data_len:]

if "_dash" in self.network:

dip2_type = data.get("type", 0)

if t.version == 3 and dip2_type != 0:

# It's a DIP2 special TX with payload

if "extraPayloadSize" not in data or "extraPayload" not in data:

raise ValueError("Payload data missing in DIP2 transaction")

if data["extraPayloadSize"] * 2 != len(data["extraPayload"]):

raise ValueError("length mismatch")

t.extra_data = pack_varint(data["extraPayloadSize"]) + binascii.unhexlify(

data["extraPayload"]

)

# Trezor (and therefore KeepKey) firmware doesn't understand the

# split of version and type, so let's mimic the old serialization

# format

t.version |= dip2_type << 16

return t

def get_raw_tx(self, txhash):

data = self.fetch_json(self.url, 'rawtx', txhash)['rawtx']

return data

TxApiBitcoin = TxApiInsight(network='insight_bitcoin', url='https://btc.coinquery.com/api')

TxApiTestnet = TxApiInsight(network='insight_testnet', url='https://test-insight.bitpay.com/api')

TxApiZcashTestnet = TxApiInsight(network='insight_zcashtestnet', url='https://explorer.testnet.z.cash/api', zcash=True)

TxApiBitcoinGold = TxApiInsight(network='insight_bitcoingold', url='https://btg.coinquery.com/api')

TxApiGroestlcoin = TxApiInsight(network='insight_groestlcoin', url='https://groestlsight.groestlcoin.org/api')

TxApiGroestlcoinTestnet = TxApiInsight(network='insight_groestlcoin_testnet', url='https://groestlsight-test.groestlcoin.org/api')

TxApiDash = TxApiInsight(network='insight_dash', url='https://dash.coinquery.com/api')