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"""BTC Address.""" # standard from hashlib import sha256 import re # local from validators.utils import validator def _decode_base58(addr: str): """Decode base58.""" alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" return sum((58**enm) * alphabet.index(idx) for enm, idx in enumerate(addr[::-1])) def _validate_old_btc_address(addr: str): """Validate P2PKH and P2SH type address.""" if len(addr) not in range(25, 35): return False decoded_bytes = _decode_base58(addr).to_bytes(25, "big") header, checksum = decoded_bytes[:-4], decoded_bytes[-4:] return checksum == sha256(sha256(header).digest()).digest()[:4] @validator def btc_address(value: str, /): """Return whether or not given value is a valid bitcoin address. Full validation is implemented for P2PKH and P2SH addresses. For segwit addresses a regexp is used to provide a reasonable estimate on whether the address is valid. Examples: >>> btc_address('3Cwgr2g7vsi1bXDUkpEnVoRLA9w4FZfC69') # Output: True >>> btc_address('1BvBMsEYstWetqTFn5Au4m4GFg7xJaNVN2') # Output: ValidationError(func=btc_address, args=...) Args: value: Bitcoin address string to validate. Returns: (Literal[True]): If `value` is a valid bitcoin address. (ValidationError): If `value` is an invalid bitcoin address. """ if not value: return False return ( # segwit pattern re.compile(r"^(bc|tc)[0-3][02-9ac-hj-np-z]{14,74}$").match(value) if value[:2] in ("bc", "tb") else _validate_old_btc_address(value) )
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