mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-18 05:28:40 +00:00
147 lines
4.8 KiB
Python
147 lines
4.8 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 random
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from decimal import Decimal
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import requests
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from . import messages
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cache_dir = None
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def is_zcash(coin):
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return coin["coin_name"].lower().startswith("zcash")
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def is_capricoin(coin):
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return coin["coin_name"].lower().startswith("capricoin")
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def _json_to_input(coin, vin):
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i = messages.TxInputType()
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if "coinbase" 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 = bytes.fromhex(vin["coinbase"])
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i.sequence = vin["sequence"]
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else:
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i.prev_hash = bytes.fromhex(vin["txid"])
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i.prev_index = vin["vout"]
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i.script_sig = bytes.fromhex(vin["scriptSig"]["hex"])
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i.sequence = vin["sequence"]
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if coin["decred"]:
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i.decred_tree = vin["tree"]
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# TODO: support amountIn, blockHeight, blockIndex
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return i
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def _json_to_bin_output(coin, vout):
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o = messages.TxOutputBinType()
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o.amount = int(Decimal(vout["value"]) * 100000000)
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o.script_pubkey = bytes.fromhex(vout["scriptPubKey"]["hex"])
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if coin["bip115"] and o.script_pubkey[-1] == 0xB4:
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# Verify if coin implements replay protection bip115 and script includes
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# 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(tail[34:37], "little") # <3-byte block height>
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if coin["decred"]:
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o.decred_script_version = vout["version"]
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return o
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def json_to_tx(coin, data):
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t = messages.TransactionType()
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t.version = data["version"]
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t.lock_time = data.get("locktime")
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if is_capricoin(coin):
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t.timestamp = data["time"]
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if coin["decred"]:
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t.expiry = data["expiry"]
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if is_zcash(coin):
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t.overwintered = data.get("fOverwintered", False)
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t.expiry = data.get("nExpiryHeight", None)
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t.version_group_id = data.get("nVersionGroupId", None)
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t.inputs = [_json_to_input(coin, vin) for vin in data["vin"]]
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t.bin_outputs = [_json_to_bin_output(coin, vout) for vout in data["vout"]]
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# zcash extra data
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if is_zcash(coin) and 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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elif 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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elif "hex" not in data:
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raise ValueError("Raw TX data required for Zcash joinsplit transaction")
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else:
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rawtx = bytes.fromhex(data["hex"])
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extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64
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t.extra_data = rawtx[-extra_data_len:]
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return t
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class TxApi:
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def __init__(self, coin_data):
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self.coin_data = coin_data
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if coin_data["blockbook"]:
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self.url = random.choice(coin_data["blockbook"])
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self.pushtx_url = self.url + "/sendtx"
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elif coin_data["bitcore"]:
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self.url = random.choice(coin_data["bitcore"])
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self.pushtx_url = self.url + "/tx/send"
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else:
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raise ValueError("No API URL in coin data")
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def fetch_json(self, *path, **params):
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url = self.url + "/api/" + "/".join(map(str, path))
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return requests.get(url, params=params).json(parse_float=Decimal)
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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 bytes.fromhex(j["blockHash"])
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def current_height(self):
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j = self.fetch_json("status", q="getBlockCount")
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return j["info"]["blocks"]
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def __getitem__(self, txhash):
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return self.get_tx(txhash.hex())
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def get_tx_data(self, txhash):
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data = self.fetch_json("tx", txhash)
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if is_zcash(self.coin_data) and data.get("vjoinsplit") and "hex" not in data:
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j = self.fetch_json("rawtx", txhash)
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data["hex"] = j["rawtx"]
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return data
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def get_tx(self, txhash):
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data = self.get_tx_data(txhash)
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return json_to_tx(self.coin_data, data)
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