@orfeas126/box-ui-elements/src/utils/validators.js

Box UI Elements

// @flow
import Address from '@hapi/address';
import tldsHapi from '@hapi/address/lib/tlds';

function hostnameValidator(value: string): boolean {
    // @see https://github.com/hapijs/joi/blame/3516cf0b995c9fe415634c4612c0ac2f8792f0b4/lib/types/string/index.js#L530
    const regex = /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9-]*[A-Za-z0-9])$/;
    return regex.test(value);
}

function ipv4AddressValidator(value: string): boolean {
    // @see https://www.oreilly.com/library/view/regular-expressions-cookbook/9780596802837/ch07s16.html
    const regex = /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
    return regex.test(value);
}

function domainNameValidator(value: string): boolean {
    return Address.domain.isValid(value);
}

// @sideway/address ^4 has exhaustive TLDs, but upgrading requires a TextEncoder polyfill (such as fast-text-encoder) for IE11 support.
// We can freely upgrade and remove manual TLD supplementation after IE11 EOL.

// Diff of '@hapi/address/lib/tlds' and:
// https://data.iana.org/TLD/tlds-alpha-by-domain.txt
// Version 2022020100, Last Updated Tue Feb  1 07:07:01 2022 UTC,
const tldSupplements = [
    'AMAZON',
    'CPA',
    'LLP',
    'MUSIC',
    'SPA',
    'XN--4DBRK0CE',
    'XN--CCKWCXETD',
    'XN--JLQ480N2RG',
    'XN--MGBCPQ6GPA1A',
    'XN--Q7CE6A',
    'ZW',
];

const emailValidator = (value: string): boolean =>
    Address.email.isValid(value, {
        tlds: { allow: new Set([...tldsHapi, ...tldSupplements.map(tld => tld.toLowerCase())]) },
    });

export { domainNameValidator, emailValidator, hostnameValidator, ipv4AddressValidator };