ox
Version:
47 lines • 1.61 kB
JavaScript
import { Bytes } from '../../index.js';
import * as Ens from '../Ens.js';
import * as Hex from '../Hex.js';
/**
* @internal
* Encodes a [DNS packet](https://docs.ens.domains/resolution/names#dns) into a ByteArray containing a UDP payload.
*/
export function packetToBytes(packet) {
// strip leading and trailing `.`
const value = packet.replace(/^\.|\.$/gm, '');
if (value.length === 0)
return new Uint8Array(1);
const bytes = new Uint8Array(Bytes.fromString(value).byteLength + 2);
let offset = 0;
const list = value.split('.');
for (let i = 0; i < list.length; i++) {
let encoded = Bytes.fromString(list[i]);
// if the length is > 255, make the encoded label value a labelhash
// this is compatible with the universal resolver
if (encoded.byteLength > 255)
encoded = Bytes.fromString(wrapLabelhash(Ens.labelhash(list[i])));
bytes[offset] = encoded.length;
bytes.set(encoded, offset + 1);
offset += encoded.length + 1;
}
if (bytes.byteLength !== offset + 1)
return bytes.slice(0, offset + 1);
return bytes;
}
/** @internal */
export function wrapLabelhash(hash) {
return `[${hash.slice(2)}]`;
}
/** @internal */
export function unwrapLabelhash(label) {
if (label.length !== 66)
return null;
if (label.indexOf('[') !== 0)
return null;
if (label.indexOf(']') !== 65)
return null;
const hash = `0x${label.slice(1, 65)}`;
if (!Hex.validate(hash, { strict: true }))
return null;
return hash;
}
//# sourceMappingURL=ens.js.map