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191 lines
6.2 KiB
191 lines
6.2 KiB
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 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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import struct
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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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lcn = coin["coin_name"].lower()
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return lcn.startswith("zcash") or lcn.startswith("komodo")
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def is_capricoin(coin):
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return coin["coin_name"].lower().startswith("capricoin")
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def is_peercoin(coin):
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return coin["coin_name"].lower().startswith("peercoin")
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def is_dash(coin):
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return coin["coin_name"].lower().startswith("dash")
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def pack_varint(n):
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if n < 253:
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return struct.pack("<B", n)
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elif n <= 0xFFFF:
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return struct.pack("<BH", 253, n)
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elif n <= 0xFFFFFFFF:
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return struct.pack("<BL", 254, n)
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else:
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return struct.pack("<BQ", 255, n)
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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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DECIMALS = 6 if is_peercoin(coin) else 8
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o.amount = int(Decimal(vout["value"]) * (10 ** DECIMALS))
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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) or is_peercoin(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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if is_dash(coin):
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dip2_type = data.get("type", 0)
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if t.version == 3 and dip2_type != 0:
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# It's a DIP2 special TX with payload
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if "extraPayloadSize" not in data or "extraPayload" not in data:
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raise ValueError("Payload data missing in DIP2 transaction")
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if data["extraPayloadSize"] * 2 != len(data["extraPayload"]):
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raise ValueError("length mismatch")
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t.extra_data = pack_varint(data["extraPayloadSize"]) + bytes.fromhex(
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data["extraPayload"]
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)
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# Trezor firmware doesn't understand the split of version and type, so let's mimic the
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# old serialization format
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t.version |= dip2_type << 16
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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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self.type = "blockbook"
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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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self.type = "bitcore"
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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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method = "tx-specific" if self.type == "blockbook" else "tx"
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data = self.fetch_json(method, 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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