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48 lines
1.6 KiB
48 lines
1.6 KiB
import extension from 'extensionizer'
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import promisify from 'pify'
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import allLocales from '../../_locales/index.json'
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const getPreferredLocales = extension.i18n
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? promisify(extension.i18n.getAcceptLanguages, { errorFirst: false })
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: async () => []
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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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*/
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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 getPreferredLocales()
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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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const firstPreferredLangCode = userPreferredLocaleCodes
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.map((code) => code.toLowerCase().replace('_', '-'))
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.find((code) =>
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Object.prototype.hasOwnProperty.call(existingLocaleCodes, code),
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)
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return existingLocaleCodes[firstPreferredLangCode] || 'en'
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}
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