50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
import { concat, hexlify } from "@ethersproject/bytes";
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import { nameprep, toUtf8Bytes } from "@ethersproject/strings";
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import { keccak256 } from "@ethersproject/keccak256";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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const Zeros = new Uint8Array(32);
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Zeros.fill(0);
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const Partition = new RegExp("^((.*)\\.)?([^.]+)$");
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export function isValidName(name) {
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try {
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const comps = name.split(".");
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for (let i = 0; i < comps.length; i++) {
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if (nameprep(comps[i]).length === 0) {
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throw new Error("empty");
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}
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}
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return true;
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}
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catch (error) { }
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return false;
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}
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export function namehash(name) {
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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 current = name;
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let result = Zeros;
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while (current.length) {
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const partition = current.match(Partition);
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if (partition == null || partition[2] === "") {
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logger.throwArgumentError("invalid ENS address; missing component", "name", name);
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}
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const label = toUtf8Bytes(nameprep(partition[3]));
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result = keccak256(concat([result, keccak256(label)]));
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current = partition[2] || "";
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}
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return hexlify(result);
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}
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export function dnsEncode(name) {
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return hexlify(concat(name.split(".").map((comp) => {
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// We jam in an _ prefix to fill in with the length later
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// Note: Nameprep throws if the component is over 63 bytes
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const bytes = toUtf8Bytes("_" + nameprep(comp));
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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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