85 lines
2.3 KiB
TypeScript
85 lines
2.3 KiB
TypeScript
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import { keccak256 } from "../crypto/keccak.js";
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import { concat, hexlify, logger, toUtf8Bytes, toUtf8String } from "../utils/index.js";
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//import { ens_normalize } from "./ens-normalize/lib";
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// @TOOD:
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function ens_normalize(name: string): string {
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return name;
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}
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const Zeros = new Uint8Array(32);
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Zeros.fill(0);
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function checkComponent(comp: Uint8Array): Uint8Array {
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if (comp.length === 0) { throw new Error("invalid ENS name; empty component"); }
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return comp;
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}
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function ensNameSplit(name: string): Array<Uint8Array> {
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const bytes = toUtf8Bytes(ens_normalize(name));
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const comps: Array<Uint8Array> = [ ];
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if (name.length === 0) { return comps; }
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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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if (last >= bytes.length) { throw new Error("invalid ENS name; empty component"); }
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comps.push(checkComponent(bytes.slice(last)));
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return comps;
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}
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export function ensNormalize(name: string): string {
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return ensNameSplit(name).map((comp) => toUtf8String(comp)).join(".");
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}
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export function isValidName(name: string): boolean {
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try {
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return (ensNameSplit(name).length !== 0);
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} catch (error) { }
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return false;
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}
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export function namehash(name: string): string {
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/* istanbul ignore if */
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if (typeof(name) !== "string") {
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logger.throwArgumentError("invalid ENS name; not a string", "name", name);
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}
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let result: string | Uint8Array = 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(<Uint8Array>(comps.pop()))] ));
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}
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return hexlify(result);
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}
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export function dnsEncode(name: string): string {
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return hexlify(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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