mirror of https://github.com/nucypher/nucypher.git
41 lines
1.6 KiB
Python
41 lines
1.6 KiB
Python
"""
|
|
This file is part of nucypher.
|
|
|
|
nucypher is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
nucypher is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with nucypher. If not, see <https://www.gnu.org/licenses/>.
|
|
"""
|
|
|
|
from web3 import Web3
|
|
|
|
|
|
def to_bytes32(value=None, hexstr=None) -> bytes:
|
|
return Web3.toBytes(primitive=value, hexstr=hexstr).rjust(32, b'\0')
|
|
|
|
|
|
def to_32byte_hex(value=None, hexstr=None) -> str:
|
|
return Web3.toHex(to_bytes32(value=value, hexstr=hexstr))
|
|
|
|
|
|
def get_mapping_entry_location(key: bytes, mapping_location: int) -> int:
|
|
if not(isinstance(key, bytes) and len(key) == 32):
|
|
raise ValueError("Mapping key must be a 32-long bytestring")
|
|
# See https://solidity.readthedocs.io/en/latest/internals/layout_in_storage.html#mappings-and-dynamic-arrays
|
|
entry_location = Web3.toInt(Web3.keccak(key + mapping_location.to_bytes(32, "big")))
|
|
return entry_location
|
|
|
|
|
|
def get_array_data_location(array_location: int) -> int:
|
|
# See https://solidity.readthedocs.io/en/latest/internals/layout_in_storage.html#mappings-and-dynamic-arrays
|
|
data_location = Web3.toInt(Web3.keccak(to_bytes32(array_location)))
|
|
return data_location
|