45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
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: string): boolean {
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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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} 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 address - " + String(name), "name", name);
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}
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let result: string | Uint8Array = Zeros;
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while (name.length) {
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const partition = name.match(Partition);
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const label = toUtf8Bytes(nameprep(partition[3]));
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result = keccak256(concat([result, keccak256(label)]));
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name = partition[2] || "";
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}
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return hexlify(result);
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}
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