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