ethers.js/lib.esm/hash/namehash.js

import { keccak256 } from "../crypto/index.js";
import { concat, hexlify, assertArgument, toUtf8Bytes } from "../utils/index.js";
import { ens_normalize } from "@adraffy/ens-normalize";
const Zeros = new Uint8Array(32);
Zeros.fill(0);
function checkComponent(comp) {
    assertArgument(comp.length !== 0, "invalid ENS name; empty component", "comp", comp);
    return comp;
}
function ensNameSplit(name) {
    const bytes = toUtf8Bytes(ensNormalize(name));
    const comps = [];
    if (name.length === 0) {
        return comps;
    }
    let last = 0;
    for (let i = 0; i < bytes.length; i++) {
        const d = bytes[i];
        // A separator (i.e. "."); copy this component
        if (d === 0x2e) {
            comps.push(checkComponent(bytes.slice(last, i)));
            last = i + 1;
        }
    }
    // There was a stray separator at the end of the name
    assertArgument(last < bytes.length, "invalid ENS name; empty component", "name", name);
    comps.push(checkComponent(bytes.slice(last)));
    return comps;
}
/**
 *  Returns the ENS %%name%% normalized.
 */
export function ensNormalize(name) {
    try {
        if (name.length === 0) {
            throw new Error("empty label");
        }
        return ens_normalize(name);
    }
    catch (error) {
        assertArgument(false, `invalid ENS name (${error.message})`, "name", name);
    }
}
/**
 *  Returns ``true`` if %%name%% is a valid ENS name.
 */
export function isValidName(name) {
    try {
        return (ensNameSplit(name).length !== 0);
    }
    catch (error) { }
    return false;
}
/**
 *  Returns the [[link-namehash]] for %%name%%.
 */
export function namehash(name) {
    assertArgument(typeof (name) === "string", "invalid ENS name; not a string", "name", name);
    assertArgument(name.length, `invalid ENS name (empty label)`, "name", name);
    let result = Zeros;
    const comps = ensNameSplit(name);
    while (comps.length) {
        result = keccak256(concat([result, keccak256((comps.pop()))]));
    }
    return hexlify(result);
}
/**
 *  Returns the DNS encoded %%name%%.
 *
 *  This is used for various parts of ENS name resolution, such
 *  as the wildcard resolution.
 */
export function dnsEncode(name, _maxLength) {
    const length = (_maxLength != null) ? _maxLength : 63;
    assertArgument(length <= 255, "DNS encoded label cannot exceed 255", "length", length);
    return hexlify(concat(ensNameSplit(name).map((comp) => {
        assertArgument(comp.length <= length, `label ${JSON.stringify(name)} exceeds ${length} bytes`, "name", name);
        const bytes = new Uint8Array(comp.length + 1);
        bytes.set(comp, 1);
        bytes[0] = bytes.length - 1;
        return bytes;
    }))) + "00";
}
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