ethers.js/lib.commonjs/hash/namehash.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dnsEncode = exports.namehash = exports.isValidName = exports.ensNormalize = void 0;
const index_js_1 = require("../crypto/index.js");
const index_js_2 = require("../utils/index.js");
const ens_normalize_1 = require("@adraffy/ens-normalize");
const Zeros = new Uint8Array(32);
Zeros.fill(0);
function checkComponent(comp) {
    (0, index_js_2.assertArgument)(comp.length !== 0, "invalid ENS name; empty component", "comp", comp);
    return comp;
}
function ensNameSplit(name) {
    const bytes = (0, index_js_2.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
    (0, index_js_2.assertArgument)(last < bytes.length, "invalid ENS name; empty component", "name", name);
    comps.push(checkComponent(bytes.slice(last)));
    return comps;
}
/**
 *  Returns the ENS %%name%% normalized.
 */
function ensNormalize(name) {
    try {
        if (name.length === 0) {
            throw new Error("empty label");
        }
        return (0, ens_normalize_1.ens_normalize)(name);
    }
    catch (error) {
        (0, index_js_2.assertArgument)(false, `invalid ENS name (${error.message})`, "name", name);
    }
}
exports.ensNormalize = ensNormalize;
/**
 *  Returns ``true`` if %%name%% is a valid ENS name.
 */
function isValidName(name) {
    try {
        return (ensNameSplit(name).length !== 0);
    }
    catch (error) { }
    return false;
}
exports.isValidName = isValidName;
/**
 *  Returns the [[link-namehash]] for %%name%%.
 */
function namehash(name) {
    (0, index_js_2.assertArgument)(typeof (name) === "string", "invalid ENS name; not a string", "name", name);
    (0, index_js_2.assertArgument)(name.length, `invalid ENS name (empty label)`, "name", name);
    let result = Zeros;
    const comps = ensNameSplit(name);
    while (comps.length) {
        result = (0, index_js_1.keccak256)((0, index_js_2.concat)([result, (0, index_js_1.keccak256)((comps.pop()))]));
    }
    return (0, index_js_2.hexlify)(result);
}
exports.namehash = namehash;
/**
 *  Returns the DNS encoded %%name%%.
 *
 *  This is used for various parts of ENS name resolution, such
 *  as the wildcard resolution.
 */
function dnsEncode(name, _maxLength) {
    const length = (_maxLength != null) ? _maxLength : 63;
    (0, index_js_2.assertArgument)(length <= 255, "DNS encoded label cannot exceed 255", "length", length);
    return (0, index_js_2.hexlify)((0, index_js_2.concat)(ensNameSplit(name).map((comp) => {
        (0, index_js_2.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";
}
exports.dnsEncode = dnsEncode;
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