def _ens_lookup(self, web3: Optional[Web3],
name: str) -> Optional[ChecksumEthAddress]:
"""Performs an ENS lookup and returns address if found else None
May raise:
- RemoteError if Etherscan is used and there is a problem querying it or
parsing its response
"""
if web3 is not None:
return web3.ens.resolve(name)
# else we gotta manually query contracts via etherscan
normal_name = normalize_name(name)
resolver_addr = self._call_contract_etherscan(
ENS_MAINNET_ADDR,
abi=ENS_ABI,
method_name='resolver',
arguments=[normal_name_to_hash(normal_name)],
)
if is_none_or_zero_address(resolver_addr):
return None
address = self._call_contract_etherscan(
to_checksum_address(resolver_addr),
abi=ENS_RESOLVER_ABI,
method_name='addr',
arguments=[normal_name_to_hash(normal_name)],
)
if is_none_or_zero_address(address):
return None
return to_checksum_address(address)
def _ens_lookup(
self,
web3: Optional[Web3],
name: str,
blockchain: SupportedBlockchain = SupportedBlockchain.ETHEREUM,
) -> Optional[Union[ChecksumEthAddress, HexStr]]:
"""Performs an ENS lookup and returns address if found else None
TODO: currently web3.py 5.15.0 does not support multichain ENS domains
(EIP-2304), therefore requesting a non-Ethereum address won't use the
web3 ens library and will require to extend the library resolver ABI.
An issue in their repo (#1839) reporting the lack of support has been
created. This function will require refactoring once they include
support for EIP-2304.
https://github.com/ethereum/web3.py/issues/1839
May raise:
- RemoteError if Etherscan is used and there is a problem querying it or
parsing its response
"""
normal_name = normalize_name(name)
resolver_addr = self._call_contract(
web3=web3,
contract_address=ENS_MAINNET_ADDR,
abi=ENS_ABI,
method_name='resolver',
arguments=[normal_name_to_hash(normal_name)],
)
if is_none_or_zero_address(resolver_addr):
return None
ens_resolver_abi = ENS_RESOLVER_ABI.copy()
arguments = [normal_name_to_hash(normal_name)]
if blockchain != SupportedBlockchain.ETHEREUM:
ens_resolver_abi.extend(ENS_RESOLVER_ABI_MULTICHAIN_ADDRESS)
arguments.append(blockchain.ens_coin_type())
address = self._call_contract(
web3=web3,
contract_address=to_checksum_address(resolver_addr),
abi=ens_resolver_abi,
method_name='addr',
arguments=arguments,
)
if is_none_or_zero_address(address):
return None
if blockchain != SupportedBlockchain.ETHEREUM:
return HexStr(address.hex())
return to_checksum_address(address)
def _prepare_ens_call_arguments(addr: ChecksumEthAddress) -> List[Any]:
try:
reversed_domain = address_to_reverse_domain(addr)
except (TypeError, ValueError) as e:
raise InputError(f'Address {addr} has incorrect format or type. {str(e)}') from e
normalized_domain_name = normalize_name(reversed_domain)
arguments = [normal_name_to_hash(normalized_domain_name)]
return arguments
def resolve(self, name, get='addr'):
normal_name = normalize_name(name)
resolver = self.resolver(normal_name)
if resolver:
lookup_function = getattr(resolver, get)
namehash = normal_name_to_hash(normal_name)
return lookup_function(namehash)
else:
return None
def resolve(self, name: str, get: str='addr') -> Optional[Union[ChecksumAddress, str]]:
normal_name = normalize_name(name)
resolver = self.resolver(normal_name)
if resolver:
lookup_function = getattr(resolver.functions, get)
namehash = normal_name_to_hash(normal_name)
address = lookup_function(namehash).call()
if is_none_or_zero_address(address):
return None
return lookup_function(namehash).call()
else:
return None
def resolve(self, name, get='addr'):
normal_name = normalize_name(name)
resolver = self.resolver(normal_name)
if resolver:
lookup_function = getattr(resolver.functions, get)
namehash = normal_name_to_hash(normal_name)
address = lookup_function(namehash).call()
if is_none_or_zero_address(address):
return None
return lookup_function(namehash).call()
else:
return None
def _get_resolver(
self,
normal_name: str,
fn_name: str = 'addr'
) -> Tuple[Optional[Union['Contract', 'AsyncContract']], str]:
current_name = normal_name
# look for a resolver, starting at the full name and taking the parent each time that no
# resolver is found
while True:
if is_empty_name(current_name):
# if no resolver found across all iterations, current_name will eventually be the
# empty string '' which returns here
return None, current_name
resolver_addr = self.ens.caller.resolver(normal_name_to_hash(current_name))
if not is_none_or_zero_address(resolver_addr):
# if resolver found, return it
return self._type_aware_resolver(resolver_addr, fn_name), current_name
# set current_name to parent and try again
current_name = self.parent(current_name)
def _reverse_registrar(self) -> 'Contract':
addr = self.ens.caller.owner(
normal_name_to_hash(REVERSE_REGISTRAR_DOMAIN))
return self.web3.eth.contract(address=addr, abi=abis.REVERSE_REGISTRAR)
def resolver(self, normal_name: str) -> Optional['Contract']:
resolver_addr = self.ens.caller.resolver(
normal_name_to_hash(normal_name))
if is_none_or_zero_address(resolver_addr):
return None
return self._resolverContract(address=resolver_addr)
def resolver(self, normal_name):
resolver_addr = self.ens.resolver(normal_name_to_hash(normal_name))
if not resolver_addr:
return None
return self._resolverContract(address=resolver_addr)
