import { concat, hexlify } from "@ethersproject/bytes";
import { toUtf8Bytes, toUtf8String } from "@ethersproject/strings";
import { keccak256 } from "@ethersproject/keccak256";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
import { ens_normalize } from "./ens-normalize/lib";
const Zeros = new Uint8Array(32);
Zeros.fill(0);
function checkComponent(comp) {
if (comp.length === 0) {
throw new Error("invalid ENS name; empty component");
}
return comp;
}
function ensNameSplit(name) {
const bytes = toUtf8Bytes(ens_normalize(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
if (last >= bytes.length) {
throw new Error("invalid ENS name; empty component");
}
comps.push(checkComponent(bytes.slice(last)));
return comps;
}
export function ensNormalize(name) {
return ensNameSplit(name).map((comp) => toUtf8String(comp)).join(".");
}
export function isValidName(name) {
try {
return (ensNameSplit(name).length !== 0);
}
catch (error) { }
return false;
}
export function namehash(name) {
/* istanbul ignore if */
if (typeof (name) !== "string") {
logger.throwArgumentError("invalid ENS name; not a string", "name", name);
}
let result = Zeros;
const comps = ensNameSplit(name);
while (comps.length) {
result = keccak256(concat([result, keccak256(comps.pop())]));
}
return hexlify(result);
}
export function dnsEncode(name) {
return hexlify(concat(ensNameSplit(name).map((comp) => {
// DNS does not allow components over 63 bytes in length
if (comp.length > 63) {
throw new Error("invalid DNS encoded entry; length exceeds 63 bytes");
}
const bytes = new Uint8Array(comp.length + 1);
bytes.set(comp, 1);
bytes[0] = bytes.length - 1;
return bytes;
}))) + "00";
}
//# sourceMappingURL=namehash.js.map