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metamask-extension/app/scripts/lib/get-first-preferred-lang-code.js
Alex Donesky 22378e4f72
fix issue where regional locales are not matched against our locales list (#12403)
* fix issue where regional locales are not matched against our locales list
2021-10-19 14:32:13 -05:00

61 lines
2.1 KiB
JavaScript

import extension from 'extensionizer';
import promisify from 'pify';
import allLocales from '../../_locales/index.json';
const getPreferredLocales = extension.i18n
? promisify(extension.i18n.getAcceptLanguages, { errorFirst: false })
: async () => [];
// mapping some browsers return hyphen instead underscore in locale codes (e.g. zh_TW -> zh-tw)
const existingLocaleCodes = {};
allLocales.forEach((locale) => {
if (locale && locale.code) {
existingLocaleCodes[locale.code.toLowerCase().replace('_', '-')] =
locale.code;
}
});
/**
* Returns a preferred language code, based on settings within the user's browser. If we have no translations for the
* users preferred locales, 'en' is returned.
*
* @returns {Promise<string>} Promises a locale code, either one from the user's preferred list that we have a translation for, or 'en'
*
*/
export default async function getFirstPreferredLangCode() {
let userPreferredLocaleCodes;
try {
userPreferredLocaleCodes = await getPreferredLocales();
} catch (e) {
// Brave currently throws when calling getAcceptLanguages, so this handles that.
userPreferredLocaleCodes = [];
}
// safeguard for Brave Browser until they implement chrome.i18n.getAcceptLanguages
// https://github.com/MetaMask/metamask-extension/issues/4270
if (!userPreferredLocaleCodes) {
userPreferredLocaleCodes = [];
}
let firstPreferredLangCode = userPreferredLocaleCodes
.map((code) => code.toLowerCase().replace('_', '-'))
.find(
(code) =>
existingLocaleCodes[code] !== undefined ||
existingLocaleCodes[code.split('-')[0]] !== undefined,
);
// if we have matched against a code with a '-' present, meaning its a regional
// code for which we have a non-regioned locale, we need to set firstPreferredLangCode
// to the correct non-regional code.
if (
firstPreferredLangCode !== undefined &&
existingLocaleCodes[firstPreferredLangCode] === undefined
) {
firstPreferredLangCode = firstPreferredLangCode.split('-')[0];
}
return existingLocaleCodes[firstPreferredLangCode] || 'en';
}