84 lines
2.7 KiB
JavaScript
84 lines
2.7 KiB
JavaScript
import { keccak256 } from "../crypto/index.js";
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import { concat, hexlify, assertArgument, toUtf8Bytes } from "../utils/index.js";
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import { ens_normalize } from "@adraffy/ens-normalize";
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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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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 = 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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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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export function ensNormalize(name) {
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try {
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if (name.length === 0) {
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throw new Error("empty label");
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}
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return ens_normalize(name);
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}
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catch (error) {
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assertArgument(false, `invalid ENS name (${error.message})`, "name", name);
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}
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}
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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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export 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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/**
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* Returns the [[link-namehash]] for %%name%%.
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*/
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export function namehash(name) {
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assertArgument(typeof (name) === "string", "invalid ENS name; not a string", "name", name);
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assertArgument(name.length, `invalid ENS name (empty label)`, "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 = keccak256(concat([result, keccak256((comps.pop()))]));
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}
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return hexlify(result);
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}
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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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export function dnsEncode(name, _maxLength) {
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const length = (_maxLength != null) ? _maxLength : 63;
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assertArgument(length <= 255, "DNS encoded label cannot exceed 255", "length", length);
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return hexlify(concat(ensNameSplit(name).map((comp) => {
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assertArgument(comp.length <= length, `label ${JSON.stringify(name)} exceeds ${length} bytes`, "name", name);
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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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//# sourceMappingURL=namehash.js.map
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