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Текущая директория: /opt/BitGoJS/node_modules/web3-validator/lib/esm/validation
Просмотр файла: bloom.js
/*
This file is part of web3.js.
web3.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
web3.js 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with web3.js. If not, see <http://www.gnu.org/licenses/>.
*/
import { keccak256 } from 'ethereum-cryptography/keccak.js';
import { codePointToInt, hexToUint8Array, padLeft, uint8ArrayToHexString } from '../utils.js';
import { isAddress } from './address.js';
import { isHexStrict } from './string.js';
/**
* Returns true if the bloom is a valid bloom
* https://github.com/joshstevens19/ethereum-bloom-filters/blob/fbeb47b70b46243c3963fe1c2988d7461ef17236/src/index.ts#L7
*/
export const isBloom = (bloom) => {
if (typeof bloom !== 'string') {
return false;
}
if (!/^(0x)?[0-9a-f]{512}$/i.test(bloom)) {
return false;
}
if (/^(0x)?[0-9a-f]{512}$/.test(bloom) || /^(0x)?[0-9A-F]{512}$/.test(bloom)) {
return true;
}
return false;
};
/**
* Returns true if the value is part of the given bloom
* note: false positives are possible.
*/
export const isInBloom = (bloom, value) => {
if (typeof value === 'string' && !isHexStrict(value)) {
return false;
}
if (!isBloom(bloom)) {
return false;
}
const uint8Array = typeof value === 'string' ? hexToUint8Array(value) : value;
const hash = uint8ArrayToHexString(keccak256(uint8Array)).slice(2);
for (let i = 0; i < 12; i += 4) {
// calculate bit position in bloom filter that must be active
const bitpos =
// eslint-disable-next-line no-bitwise
((parseInt(hash.slice(i, i + 2), 16) << 8) + parseInt(hash.slice(i + 2, i + 4), 16)) &
2047;
// test if bitpos in bloom is active
const code = codePointToInt(bloom.charCodeAt(bloom.length - 1 - Math.floor(bitpos / 4)));
// eslint-disable-next-line no-bitwise
const offset = 1 << bitpos % 4;
// eslint-disable-next-line no-bitwise
if ((code & offset) !== offset) {
return false;
}
}
return true;
};
/**
* Returns true if the ethereum users address is part of the given bloom note: false positives are possible.
*/
export const isUserEthereumAddressInBloom = (bloom, ethereumAddress) => {
if (!isBloom(bloom)) {
return false;
}
if (!isAddress(ethereumAddress)) {
return false;
}
// you have to pad the ethereum address to 32 bytes
// else the bloom filter does not work
// this is only if your matching the USERS
// ethereum address. Contract address do not need this
// hence why we have 2 methods
// (0x is not in the 2nd parameter of padleft so 64 chars is fine)
const address = padLeft(ethereumAddress, 64);
return isInBloom(bloom, address);
};
/**
* Returns true if the contract address is part of the given bloom.
* note: false positives are possible.
*/
export const isContractAddressInBloom = (bloom, contractAddress) => {
if (!isBloom(bloom)) {
return false;
}
if (!isAddress(contractAddress)) {
return false;
}
return isInBloom(bloom, contractAddress);
};
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