69 lines
1.9 KiB
JavaScript
69 lines
1.9 KiB
JavaScript
import
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supportedLanguages,
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{ langTagRegex }
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from '../../common/utils/supported-languages';
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import passthroughs from '../utils/lang-passthrough-urls';
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import debug from 'debug';
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const log = debug('fcc:middlewares:lang');
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const toLowerCase = String.prototype.toLowerCase;
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// redirect(statusOrUrl: String|Number, url?: String) => Void
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function langRedirect(...args) {
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const url = args.length === 2 ? args[1] : args[0];
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const { lang } = this.req;
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const maybeLang = toLowerCase.call((url.split('/')[1] || ''));
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if (
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passthroughs[maybeLang] ||
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supportedLanguages[maybeLang]
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) {
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return this._oldRedirect(...arguments);
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}
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// if language present add to url
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if (lang) {
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return this._oldRedirect(`/${lang}${url}`);
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}
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// default to english
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return this._oldRedirect(`/en${url}`);
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}
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// prefer url lang over user lang
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// if url lang is not supported move to user lang
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// if user lang is not supported default to english
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export default function addLang() {
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return function(req, res, next) {
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const { url, user = {} } = req;
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const maybeLang = url.split('/')[1];
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const restUrl = url.split('/').slice(2).join('/');
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const userLang = user.languageTag;
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let finalLang;
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if (supportedLanguages[maybeLang]) {
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finalLang = maybeLang;
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} else if (supportedLanguages[userLang]) {
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finalLang = userLang;
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} else {
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finalLang = 'en';
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}
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// found url lang tag that is not yet supported
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// redirect to fix url with supported lang tag
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if (langTagRegex.test(maybeLang) && !supportedLanguages[maybeLang]) {
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log(`unsupported lang tag ${maybeLang}`);
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return res.redirect(`/${finalLang}/${restUrl}`);
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}
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res.locals.supportedLanguages = supportedLanguages;
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if (supportedLanguages[finalLang]) {
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req.lang = finalLang;
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res.locals.lang = finalLang;
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}
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res._oldRedirect = res.redirect;
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res.redirect = langRedirect;
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return next();
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};
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}
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