ethers.js/packages/hash/lib/namehash.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dnsEncode = exports.namehash = exports.isValidName = void 0;
var bytes_1 = require("@ethersproject/bytes");
var strings_1 = require("@ethersproject/strings");
var keccak256_1 = require("@ethersproject/keccak256");
var logger_1 = require("@ethersproject/logger");
var _version_1 = require("./_version");
var logger = new logger_1.Logger(_version_1.version);
var Zeros = new Uint8Array(32);
Zeros.fill(0);
var Partition = new RegExp("^((.*)\\.)?([^.]+)$");
function isValidName(name) {
    try {
        var comps = name.split(".");
        for (var i = 0; i < comps.length; i++) {
            if ((0, strings_1.nameprep)(comps[i]).length === 0) {
                throw new Error("empty");
            }
        }
        return true;
    }
    catch (error) { }
    return false;
}
exports.isValidName = isValidName;
function namehash(name) {
    /* istanbul ignore if */
    if (typeof (name) !== "string") {
        logger.throwArgumentError("invalid ENS name; not a string", "name", name);
    }
    var current = name;
    var result = Zeros;
    while (current.length) {
        var partition = current.match(Partition);
        if (partition == null || partition[2] === "") {
            logger.throwArgumentError("invalid ENS address; missing component", "name", name);
        }
        var label = (0, strings_1.toUtf8Bytes)((0, strings_1.nameprep)(partition[3]));
        result = (0, keccak256_1.keccak256)((0, bytes_1.concat)([result, (0, keccak256_1.keccak256)(label)]));
        current = partition[2] || "";
    }
    return (0, bytes_1.hexlify)(result);
}
exports.namehash = namehash;
function dnsEncode(name) {
    return (0, bytes_1.hexlify)((0, bytes_1.concat)(name.split(".").map(function (comp) {
        // We jam in an _ prefix to fill in with the length later
        // Note: Nameprep throws if the component is over 63 bytes
        var bytes = (0, strings_1.toUtf8Bytes)("_" + (0, strings_1.nameprep)(comp));
        bytes[0] = bytes.length - 1;
        return bytes;
    }))) + "00";
}
exports.dnsEncode = dnsEncode;
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