16 lines
678 B
JavaScript
16 lines
678 B
JavaScript
/**
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* A simple test to determine if a hostname is a properly-formatted domain name
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*
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* A "valid domain" is defined here: https://url.spec.whatwg.org/#valid-domain
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*
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* Regex was originally sourced from here, then remixed to add punycode support:
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* https://www.oreilly.com/library/view/regular-expressions-cookbook/9781449327453/ch08s15.html
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*/
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export function isValidDomain(hostname) {
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return (
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// Consider localhost valid as well since it's okay wrt Secure Contexts
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hostname === 'localhost' ||
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// Support punycode (ACE) or ascii labels and domains
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/^((xn--[a-z0-9-]+|[a-z0-9]+(-[a-z0-9]+)*)\.)+([a-z]{2,}|xn--[a-z0-9-]+)$/i.test(hostname));
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}
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