whoiser/dist/utils.js

Whois info for domains, TLDs, IPs, and ASN

import { toASCII } from 'punycode-esm';
/**
 * Split a string into two parts at a given index.
 *
 * @param string The string to split.
 * @param by The index at which to split the string.
 * @returns An array containing the two parts of the string.
 */
export function splitStringBy(string, by) {
    return [string.slice(0, by), string.slice(by + 1)];
}
/**
 * Check if a string is a valid TLD, and return it in canonical form.
 *
 * @param tld
 * @returns The normalized TLD
 * @throws If the TLD is invalid
 */
export function validatedTld(tld) {
    tld = tld.trim().toLowerCase();
    if (tld.startsWith('.')) {
        tld = tld.substring(1);
    }
    if (tld.endsWith('.')) {
        tld = tld.slice(0, -1);
    }
    const labelTest = /^([a-z]{2,64}|xn[a-z0-9-]{5,})$/;
    const labels = tld.split('.').map((label) => toASCII(label));
    if (!labels.every((label) => labelTest.test(label))) {
        throw new Error(`Invalid TLD "${tld}"`);
    }
    //return labels.join('.')
    return tld;
}
/**
 * Check if a string is a valid TLD format
 */
function isTld(tld) {
    if (tld.startsWith('.')) {
        tld = tld.substring(1);
    }
    //todo use https://nodejs.org/api/url.html#urldomaintoasciidomain
    return /^([a-z]{2,64}|xn[a-z0-9-]{5,})$/i.test(toASCII(tld));
}
/**
 * Check if a string is a valid domain format
 * @param domain The domain to check.
 */
export function isDomain(domain) {
    if (domain.startsWith('.')) {
        domain = domain.slice(1);
    }
    if (domain.endsWith('.')) {
        domain = domain.slice(0, -1);
    }
    const labels = toASCII(domain).split('.').reverse();
    const labelTest = /^([a-z0-9-]{1,64}|xn[a-z0-9-]{5,})$/i;
    return (labels.length > 1 &&
        labels.every((label, index) => {
            return index ? labelTest.test(label) && !label.startsWith('-') && !label.endsWith('-') : isTld(label);
        }));
}