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141 lines
4.9 KiB
141 lines
4.9 KiB
# 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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import json
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from decimal import Decimal
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import requests
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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=None):
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self.network = network
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self.url = url
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def get_url(self, *args):
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return "/".join(map(str, [self.url, "api"] + list(args)))
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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" % (
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cache_dir,
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self.network,
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resource,
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resourceid,
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)
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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 Exception:
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pass
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if not self.url:
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raise RuntimeError("No URL specified and tx not in cache")
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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 Exception:
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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 Exception:
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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=None, zcash=None, bip115=False):
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super().__init__(network, url)
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self.zcash = zcash
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self.bip115 = bip115
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if url:
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self.pushtx_url = self.url + "/tx/send"
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def get_block_hash(self, block_number):
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j = self.fetch_json("block-index", block_number)
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return binascii.unhexlify(j["blockHash"])
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def current_height(self):
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r = requests.get(self.get_url("status?q=getBlockCount"))
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j = r.json(parse_float=str)
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block_height = j["info"]["blocks"]
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return block_height
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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.bip115 and o.script_pubkey[-1] == 0xb4:
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# Verify if coin implements replay protection bip115 and script includes checkblockatheight opcode. 0xb4 - is op_code (OP_CHECKBLOCKATHEIGHT)
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# <OP_32> <32-byte block hash> <OP_3> <3-byte block height> <OP_CHECKBLOCKATHEIGHT>
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tail = o.script_pubkey[-38:]
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o.block_hash = tail[1:33] # <32-byte block hash>
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o.block_height = int.from_bytes(
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tail[34:37], byteorder="little"
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) # <3-byte block height>
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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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