@plone/volto/src/actions/language/language.js

Volto

import { updateIntl } from 'react-intl-redux';
import {
  toGettextLang,
  toReactIntlLang,
} from '@plone/volto/helpers/Utils/Utils';
import { getCookieOptions } from '@plone/volto/helpers/Cookies/cookies';
import Cookies from 'universal-cookie';

export function changeLanguageCookies(language, req) {
  const cookies = new Cookies();

  const cookieOptions = getCookieOptions({
    secure: req?.protocol?.startsWith('https') ? true : false,
    sameSite: 'strict',
  });

  if (!req) {
    cookies.set('I18N_LANGUAGE', toGettextLang(language) || '', cookieOptions);
  } else {
    req.universalCookies.set(
      'I18N_LANGUAGE',
      toGettextLang(language) || '',
      cookieOptions,
    );
  }
}

/**
 * Changes current language using react-intl-redux action and setting the cookie
 * @function changeLanguage
 * @param {string} language target language.
 * @param {number} locale set of locales corresponding the target language.
 * @returns {Object} Change the target language action.
 */
export function changeLanguage(language, locale, req) {
  changeLanguageCookies(language, req);

  return updateIntl({
    locale: toReactIntlLang(language),
    messages: locale,
  });
}