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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/viem/_esm/utils/ens

Просмотр файла: namehash.js

import { concat } from '../data/concat.js';
import { stringToBytes, toBytes, } from '../encoding/toBytes.js';
import { bytesToHex } from '../encoding/toHex.js';
import { keccak256 } from '../hash/keccak256.js';
import { encodedLabelToLabelhash, } from './encodedLabelToLabelhash.js';
/**
 * @description Hashes ENS name
 *
 * - Since ENS names prohibit certain forbidden characters (e.g. underscore) and have other validation rules, you likely want to [normalize ENS names](https://docs.ens.domains/contract-api-reference/name-processing#normalising-names) with [UTS-46 normalization](https://unicode.org/reports/tr46) before passing them to `namehash`. You can use the built-in [`normalize`](https://viem.sh/docs/ens/utilities/normalize) function for this.
 *
 * @example
 * namehash('wevm.eth')
 * '0x08c85f2f4059e930c45a6aeff9dcd3bd95dc3c5c1cddef6a0626b31152248560'
 *
 * @link https://eips.ethereum.org/EIPS/eip-137
 */
export function namehash(name) {
    let result = new Uint8Array(32).fill(0);
    if (!name)
        return bytesToHex(result);
    const labels = name.split('.');
    // Iterate in reverse order building up hash
    for (let i = labels.length - 1; i >= 0; i -= 1) {
        const hashFromEncodedLabel = encodedLabelToLabelhash(labels[i]);
        const hashed = hashFromEncodedLabel
            ? toBytes(hashFromEncodedLabel)
            : keccak256(stringToBytes(labels[i]), 'bytes');
        result = keccak256(concat([result, hashed]), 'bytes');
    }
    return bytesToHex(result);
}
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