mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-25 07:48:10 +00:00
141 lines
4.9 KiB
Python
141 lines
4.9 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
|
|
import json
|
|
from decimal import Decimal
|
|
|
|
import requests
|
|
|
|
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, *args):
|
|
return "/".join(map(str, [self.url, "api"] + list(args)))
|
|
|
|
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:
|
|
self.pushtx_url = self.url + "/tx/send"
|
|
|
|
def get_block_hash(self, block_number):
|
|
j = self.fetch_json("block-index", block_number)
|
|
return binascii.unhexlify(j["blockHash"])
|
|
|
|
def current_height(self):
|
|
r = requests.get(self.get_url("status?q=getBlockCount"))
|
|
j = r.json(parse_float=str)
|
|
block_height = j["info"]["blocks"]
|
|
return block_height
|
|
|
|
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
|