def encode_abi(web3, abi, arguments, data=None):
argument_types = get_abi_input_types(abi)
if not check_if_arguments_can_be_encoded(abi, arguments, {}):
raise TypeError(
"One or more arguments could not be encoded to the necessary "
"ABI type. Expected types are: {0}".format(
', '.join(argument_types), ))
try:
normalizers = [
abi_ens_resolver(web3),
abi_address_to_hex,
abi_bytes_to_bytes,
abi_string_to_text,
]
normalized_arguments = map_abi_data(
normalizers,
argument_types,
arguments,
)
encoded_arguments = eth_abi_encode_abi(
argument_types,
normalized_arguments,
)
except EncodingError as e:
raise TypeError(
"One or more arguments could not be encoded to the necessary "
"ABI type: {0}".format(str(e)))
if data:
return to_hex(HexBytes(data) + encoded_arguments)
else:
return encode_hex(encoded_arguments)
def name_to_address_middleware(w3):
normalizers = [
abi_ens_resolver(w3),
]
return construct_formatting_middleware(
request_formatters=abi_request_formatters(normalizers, RPC_ABIS)
)
def soliditySha256(self, abi_types, values):
normalized_values = map_abi_data([abi_ens_resolver(Web3)], abi_types,
values)
#print(normalized_values)
hex_string = add_0x_prefix(''.join(
remove_0x_prefix(hex_encode_abi_type(abi_type, value))
for abi_type, value in zip(abi_types, normalized_values)))
#print(hex_string)
hash_object = hashlib.sha256(Web3.toBytes(hexstr=hex_string))
return hash_object.hexdigest()
def pack_data(abi_types, values) -> bytes:
"""Normalize data and pack them into a byte array"""
if len(abi_types) != len(values):
raise ValueError(
"Length mismatch between provided abi types and values. Got "
"{0} types and {1} values.".format(len(abi_types), len(values)))
normalized_values = map_abi_data([abi_ens_resolver(None)], abi_types,
values)
return decode_hex(''.join(
remove_0x_prefix(hex_encode_abi_type(abi_type, value))
for abi_type, value in zip(abi_types, normalized_values)))
def get_request_bytes_representation(payee_id_addresses,
amounts,
payer,
ipfs_hash=None):
""" Return the bytes representation of the given Request data.
The JS version uses lower-cased addresses but web3.py expects checksum
addresses. To work around this the encoded result is converted to lowercase.
address(creator)
address(payer)
uint8(number_of_payees)
[
address(main_payee_address)
int256(main_payee_expected_amount)
address(second_payee_address)
int256(second_payee_expected_amount)
...
]
uint8(data_string_size)
size(data)
:return:
"""
ipfs_hash = ipfs_hash if ipfs_hash else ''
payer = payer if payer else EMPTY_BYTES_20
parts = [(payee_id_addresses[0], 'address'), (payer, 'address'),
(len(payee_id_addresses), 'uint8')]
for i in range(0, len(payee_id_addresses)):
parts.append((payee_id_addresses[i], 'address'))
parts.append((amounts[i], 'int256'))
parts.append((len(ipfs_hash), 'uint8'))
parts.append((ipfs_hash, 'string'))
values, abi_types = zip(*parts)
# Taken from `Web3.soliditySha3`
normalized_values = map_abi_data([abi_ens_resolver(w3)], abi_types, values)
return add_0x_prefix(''.join(
remove_0x_prefix(hex_encode_abi_type(abi_type, value))
for abi_type, value in zip(abi_types, normalized_values))).lower()
def _encode_abi(cls, abi, arguments, data=None):
argument_types = get_abi_input_types(abi)
if not check_if_arguments_can_be_encoded(abi, arguments, {}):
raise TypeError(
"One or more arguments could not be encoded to the necessary "
"ABI type. Expected types are: {0}".format(
', '.join(argument_types),
)
)
try:
normalizers = [
abi_ens_resolver(cls.web3),
abi_address_to_hex,
abi_bytes_to_hex,
abi_string_to_hex,
hexstrs_to_bytes,
]
normalized_arguments = map_abi_data(
normalizers,
argument_types,
arguments,
)
encoded_arguments = encode_abi(
argument_types,
normalized_arguments,
)
except EncodingError as e:
raise TypeError(
"One or more arguments could not be encoded to the necessary "
"ABI type: {0}".format(str(e))
)
if data:
return to_hex(HexBytes(data) + encoded_arguments)
else:
return encode_hex(encoded_arguments)
def soliditySha3(cls, abi_types, values):
"""
Executes sha3 (keccak256) exactly as Solidity does.
Takes list of abi_types as inputs -- `[uint24, int8[], bool]`
and list of corresponding values -- `[20, [-1, 5, 0], True]`
"""
if len(abi_types) != len(values):
raise ValueError(
"Length mismatch between provided abi types and values. Got "
"{0} types and {1} values.".format(len(abi_types),
len(values)))
if isinstance(cls, type):
w3 = None
else:
w3 = cls
normalized_values = map_abi_data([abi_ens_resolver(w3)], abi_types,
values)
hex_string = add_0x_prefix(''.join(
remove_0x_prefix(hex_encode_abi_type(abi_type, value))
for abi_type, value in zip(abi_types, normalized_values)))
return cls.sha3(hexstr=hex_string)
def soliditySha3(cls, abi_types, values):
"""
Executes sha3 (keccak256) exactly as Solidity does.
Takes list of abi_types as inputs -- `[uint24, int8[], bool]`
and list of corresponding values -- `[20, [-1, 5, 0], True]`
"""
if len(abi_types) != len(values):
raise ValueError(
"Length mismatch between provided abi types and values. Got "
"{0} types and {1} values.".format(len(abi_types), len(values))
)
if isinstance(cls, type):
w3 = None
else:
w3 = cls
normalized_values = map_abi_data([abi_ens_resolver(w3)], abi_types, values)
hex_string = add_0x_prefix(''.join(
remove_0x_prefix(hex_encode_abi_type(abi_type, value))
for abi_type, value
in zip(abi_types, normalized_values)
))
return cls.sha3(hexstr=hex_string)
def __resolve_ens_name_to_address(ens_name, web3):
(abi_type, resolved) = abi_ens_resolver(w3=web3,
abi_type="address",
val=ens_name)
return resolved
def name_to_address_middleware(w3):
normalizers = [
abi_ens_resolver(w3),
]
return construct_formatting_middleware(
request_formatters=abi_request_formatters(normalizers, RPC_ABIS))
