88 lines
2.9 KiB
JavaScript
88 lines
2.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.dnsEncode = exports.namehash = exports.isValidName = exports.ensNormalize = void 0;
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const index_js_1 = require("../crypto/index.js");
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const index_js_2 = require("../utils/index.js");
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const xnf_1 = require("@adraffy/ens-normalize/xnf");
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const Zeros = new Uint8Array(32);
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Zeros.fill(0);
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function checkComponent(comp) {
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(0, index_js_2.assertArgument)(comp.length !== 0, "invalid ENS name; empty component", "comp", comp);
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return comp;
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}
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function ensNameSplit(name) {
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const bytes = (0, index_js_2.toUtf8Bytes)(ensNormalize(name));
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const comps = [];
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if (name.length === 0) {
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return comps;
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}
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let last = 0;
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for (let i = 0; i < bytes.length; i++) {
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const d = bytes[i];
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// A separator (i.e. "."); copy this component
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if (d === 0x2e) {
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comps.push(checkComponent(bytes.slice(last, i)));
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last = i + 1;
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}
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}
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// There was a stray separator at the end of the name
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(0, index_js_2.assertArgument)(last < bytes.length, "invalid ENS name; empty component", "name", name);
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comps.push(checkComponent(bytes.slice(last)));
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return comps;
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}
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/**
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* Returns the ENS %%name%% normalized.
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*/
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function ensNormalize(name) {
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try {
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return (0, xnf_1.ens_normalize)(name);
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}
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catch (error) {
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(0, index_js_2.assertArgument)(false, `invalid ENS name (${error.message})`, "name", name);
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}
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}
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exports.ensNormalize = ensNormalize;
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/**
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* Returns ``true`` if %%name%% is a valid ENS name.
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*/
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function isValidName(name) {
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try {
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return (ensNameSplit(name).length !== 0);
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}
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catch (error) { }
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return false;
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}
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exports.isValidName = isValidName;
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/**
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* Returns the [[link-namehash]] for %%name%%.
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*/
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function namehash(name) {
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(0, index_js_2.assertArgument)(typeof (name) === "string", "invalid ENS name; not a string", "name", name);
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let result = Zeros;
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const comps = ensNameSplit(name);
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while (comps.length) {
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result = (0, index_js_1.keccak256)((0, index_js_2.concat)([result, (0, index_js_1.keccak256)((comps.pop()))]));
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}
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return (0, index_js_2.hexlify)(result);
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}
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exports.namehash = namehash;
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/**
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* Returns the DNS encoded %%name%%.
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*
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* This is used for various parts of ENS name resolution, such
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* as the wildcard resolution.
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*/
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function dnsEncode(name) {
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return (0, index_js_2.hexlify)((0, index_js_2.concat)(ensNameSplit(name).map((comp) => {
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// DNS does not allow components over 63 bytes in length
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if (comp.length > 63) {
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throw new Error("invalid DNS encoded entry; length exceeds 63 bytes");
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}
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const bytes = new Uint8Array(comp.length + 1);
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bytes.set(comp, 1);
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bytes[0] = bytes.length - 1;
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return bytes;
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}))) + "00";
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}
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exports.dnsEncode = dnsEncode;
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//# sourceMappingURL=namehash.js.map
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