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const extension = require('extensionizer')
const promisify = require('pify')
const allLocales = require('../../_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'
*
*/
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 = []
}
const firstPreferredLangCode = userPreferredLocaleCodes
.map(code => code.toLowerCase().replace('_', '-'))
.find(code => existingLocaleCodes.hasOwnProperty(code))
return existingLocaleCodes[firstPreferredLangCode] || 'en'
}
module.exports = getFirstPreferredLangCode
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