mirror of https://github.com/jkjoy/sunpeiwen.git
56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
'use strict';
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const { parse } = require('url');
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const Cache = require('./cache');
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const cache = new Cache();
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/**
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* Check whether the link is external
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* @param {String} input The url to check
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* @param {String} input The hostname / url of website
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* @param {Array} input Exclude hostnames. Specific subdomain is required when applicable, including www.
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* @returns {Boolean} True if the link doesn't have protocol or link has same host with config.url
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*/
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function isExternalLink(input, sitehost, exclude) {
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return cache.apply(`${input}-${sitehost}-${exclude}`, () => {
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// Return false early for internal link
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if (!/^(\/\/|http(s)?:)/.test(input)) return false;
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sitehost = parse(sitehost).hostname || sitehost;
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if (!sitehost) return false;
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// handle relative url and invalid url
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let data;
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try {
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data = new URL(input, `http://${sitehost}`);
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} catch (e) { }
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// if input is invalid url, data should be undefined
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if (typeof data !== 'object') return false;
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// handle mailto: javascript: vbscript: and so on
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if (data.origin === 'null') return false;
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const host = data.hostname;
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if (exclude) {
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exclude = Array.isArray(exclude) ? exclude : [exclude];
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if (exclude && exclude.length) {
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for (const i of exclude) {
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if (host === i) return false;
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}
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}
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}
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if (host !== sitehost) return true;
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return false;
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});
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}
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module.exports = isExternalLink;
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