viem/_esm/utils/ens/packetToBytes.js

TypeScript Interface for Ethereum

import { stringToBytes, } from '../encoding/toBytes.js';
import { encodeLabelhash, } from './encodeLabelhash.js';
import { labelhash } from './labelhash.js';
/*
 * @description Encodes a DNS packet into a ByteArray containing a UDP payload.
 *
 * @example
 * packetToBytes('awkweb.eth')
 * '0x0661776b7765620365746800'
 *
 * @see https://docs.ens.domains/resolution/names#dns
 *
 */
export function packetToBytes(packet) {
    // strip leading and trailing `.`
    const value = packet.replace(/^\.|\.$/gm, '');
    if (value.length === 0)
        return new Uint8Array(1);
    const bytes = new Uint8Array(stringToBytes(value).byteLength + 2);
    let offset = 0;
    const list = value.split('.');
    for (let i = 0; i < list.length; i++) {
        let encoded = stringToBytes(list[i]);
        // if the length is > 255, make the encoded label value a labelhash
        // this is compatible with the universal resolver
        if (encoded.byteLength > 255)
            encoded = stringToBytes(encodeLabelhash(labelhash(list[i])));
        bytes[offset] = encoded.length;
        bytes.set(encoded, offset + 1);
        offset += encoded.length + 1;
    }
    if (bytes.byteLength !== offset + 1)
        return bytes.slice(0, offset + 1);
    return bytes;
}
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