58 lines
2.2 KiB
JavaScript
58 lines
2.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.canonicalDomain = canonicalDomain;
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const constants_1 = require("./constants");
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const node_url_1 = require("node:url");
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/**
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* Transforms a domain name into a canonical domain name. The canonical domain name is a domain name
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* that has been trimmed, lowercased, stripped of leading dot, and optionally punycode-encoded
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* ({@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.1.2 | Section 5.1.2 of RFC 6265}). For
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* the most part, this function is idempotent (calling the function with the output from a previous call
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* returns the same output).
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*
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* @remarks
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* A canonicalized host name is the string generated by the following
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* algorithm:
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*
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* 1. Convert the host name to a sequence of individual domain name
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* labels.
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*
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* 2. Convert each label that is not a Non-Reserved LDH (NR-LDH) label,
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* to an A-label (see Section 2.3.2.1 of [RFC5890] for the former
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* and latter), or to a "punycode label" (a label resulting from the
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* "ToASCII" conversion in Section 4 of [RFC3490]), as appropriate
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* (see Section 6.3 of this specification).
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*
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* 3. Concatenate the resulting labels, separated by a %x2E (".")
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* character.
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*
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* @example
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* ```
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* canonicalDomain('.EXAMPLE.com') === 'example.com'
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* ```
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*
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* @param domainName - the domain name to generate the canonical domain from
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* @public
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*/
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function canonicalDomain(domainName) {
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if (domainName == null) {
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return undefined;
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}
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let str = domainName.trim().replace(/^\./, ''); // S4.1.2.3 & S5.2.3: ignore leading .
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if (constants_1.IP_V6_REGEX_OBJECT.test(str)) {
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if (!str.startsWith('[')) {
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str = '[' + str;
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}
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if (!str.endsWith(']')) {
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str = str + ']';
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}
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return (0, node_url_1.domainToASCII)(str).slice(1, -1); // remove [ and ]
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}
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// convert to IDN if any non-ASCII characters
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// eslint-disable-next-line no-control-regex
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if (/[^\u0001-\u007f]/.test(str)) {
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return (0, node_url_1.domainToASCII)(str);
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}
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// ASCII-only domain - not canonicalized with new URL() because it may be a malformed URL
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return str.toLowerCase();
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}
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