109 lines
2.8 KiB
Python
109 lines
2.8 KiB
Python
# standard imports
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import logging
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# third-party imports
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import sha3
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from eth_keys import KeyAPI
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from eth_keys.backends import NativeECCBackend
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from rlp import decode as rlp_decode
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from rlp import encode as rlp_encode
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# local imports
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from .address import to_checksum
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from .constant import MINIMUM_FEE_UNITS
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logg = logging.getLogger(__name__)
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field_debugs = [
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'nonce',
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'gasPrice',
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'gas',
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'to',
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'value',
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'data',
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'v',
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'r',
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's',
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]
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def unpack_signed(tx_raw_bytes, chain_id=1):
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d = rlp_decode(tx_raw_bytes)
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logg.debug('decoding using chain id {}'.format(chain_id))
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j = 0
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for i in d:
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logg.debug('decoded {}: {}'.format(field_debugs[j], i.hex()))
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j += 1
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vb = chain_id
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if chain_id != 0:
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v = int.from_bytes(d[6], 'big')
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vb = v - (chain_id * 2) - 35
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s = b''.join([d[7], d[8], bytes([vb])])
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so = KeyAPI.Signature(signature_bytes=s)
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h = sha3.keccak_256()
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h.update(rlp_encode(d))
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signed_hash = h.digest()
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d[6] = chain_id
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d[7] = b''
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d[8] = b''
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h = sha3.keccak_256()
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h.update(rlp_encode(d))
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unsigned_hash = h.digest()
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p = so.recover_public_key_from_msg_hash(unsigned_hash)
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a = p.to_checksum_address()
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logg.debug('decoded recovery byte {}'.format(vb))
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logg.debug('decoded address {}'.format(a))
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logg.debug('decoded signed hash {}'.format(signed_hash.hex()))
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logg.debug('decoded unsigned hash {}'.format(unsigned_hash.hex()))
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to = d[3].hex() or None
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if to != None:
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to = to_checksum(to)
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return {
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'from': a,
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'nonce': int.from_bytes(d[0], 'big'),
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'gasPrice': int.from_bytes(d[1], 'big'),
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'gas': int.from_bytes(d[2], 'big'),
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'to': to,
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'value': int.from_bytes(d[4], 'big'),
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'data': '0x' + d[5].hex(),
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'v': chain_id,
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'r': '0x' + s[:32].hex(),
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's': '0x' + s[32:64].hex(),
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'chainId': chain_id,
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'hash': '0x' + signed_hash.hex(),
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'hash_unsigned': '0x' + unsigned_hash.hex(),
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}
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class TxFactory:
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def __init__(self, signer, gas_oracle, nonce_oracle, chain_id=1):
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self.gas_oracle = gas_oracle
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self.nonce_oracle = nonce_oracle
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self.chain_id = chain_id
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self.signer = signer
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def template(self, sender, recipient):
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gas_price = self.gas_oracle.get()
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logg.debug('using gas price {}'.format(gas_price))
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nonce = self.nonce_oracle.next()
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logg.debug('using nonce {} for address {}'.format(nonce, sender))
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return {
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'from': sender,
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'to': recipient,
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'value': 0,
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'data': '0x',
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'nonce': nonce,
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'gasPrice': gas_price,
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'gas': MINIMUM_FEE_UNITS,
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'chainId': self.chain_id,
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}
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