gristlabs_grist-core/app/server/lib/ServerLocale.ts

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import {parse as languageParser} from "accept-language-parser";
import {IncomingMessage} from 'http';
import {locales} from 'app/common/Locales';
/**
* Returns the locale from a request, falling back to `defaultLocale`
* if unable to determine the locale.
*/
export function localeFromRequest(req: IncomingMessage, defaultLocale: string = 'en-US') {
const language = languageParser(req.headers["accept-language"] as string)[0];
if (!language) { return defaultLocale; }
const locale = `${language.code}-${language.region}`;
const supports = locales.some(l => l.code === locale);
return supports ? locale : defaultLocale;
}