Source code for autobahn.xbr._eip712_base

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from typing import Dict, Any
from binascii import a2b_hex
from py_eth_sig_utils import signing

_EIP712_SIG_LEN = 32 + 32 + 1


[docs]def _hash(data) -> bytes: """ keccak256(abi.encode( EIP712_MEMBER_REGISTER_TYPEHASH, obj.chainId, obj.verifyingContract, obj.member, obj.registered, keccak256(bytes(obj.eula)), keccak256(bytes(obj.profile)) )); :param data: :return: """
[docs]def sign(eth_privkey: bytes, data: Dict[str, Any]) -> bytes: """ Sign the given data using the given Ethereum private key. :param eth_privkey: Signing key. :param data: Data to sign. :return: Signature. """ # internally, this is using py_eth_sig_utils.eip712.encode_typed_data _args = signing.sign_typed_data(data, eth_privkey) # serialize structured signature (v, r, s) into bytes signature = signing.v_r_s_to_signature(*_args) # be paranoid about what to expect assert type(signature) == bytes and len(signature) == _EIP712_SIG_LEN return signature
[docs]def recover(data: Dict[str, Any], signature: bytes) -> bytes: """ Recover the Ethereum address of the signer, given the data and signature. :param data: Signed data. :param signature: Signature. :return: Signing address. """ assert type(signature) == bytes and len(signature) == _EIP712_SIG_LEN signer_address = signing.recover_typed_data(data, *signing.signature_to_v_r_s(signature)) return a2b_hex(signer_address[2:])
[docs]def is_address(provided: Any) -> bool: """ Check if the value is a proper Ethereum address. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == 20
[docs]def is_bytes16(provided: Any) -> bool: """ Check if the value is a proper (binary) UUID. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == 16
[docs]def is_bytes32(provided: Any) -> bool: """ Check if the value is of type bytes and length 32. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == 32
[docs]def is_signature(provided: Any) -> bool: """ Check if the value is a proper Ethereum signature. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == _EIP712_SIG_LEN
[docs]def is_eth_privkey(provided: Any) -> bool: """ Check if the value is a proper Ethereum private key (seed). :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == 32
[docs]def is_cs_pubkey(provided: Any) -> bool: """ Check if the value is a proper WAMP-cryptosign public key. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == bytes and len(provided) == 32
[docs]def is_block_number(provided: Any) -> bool: """ Check if the value is a proper Ethereum block number. :param provided: The value to check. :return: True iff the value is of correct type. """ return type(provided) == int
[docs]def is_chain_id(provided: Any) -> bool: """ Check if the value is a proper Ethereum chain ID. :param provided: The value to check. :return: True iff the value is of correct type. """ # here is a list of public networks: https://chainid.network/ # note: we allow any positive integer to account for private networks return type(provided) == int and provided > 0