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// eslint-disable-next-line import/no-nodejs-modules
import { readFile } from 'fs/promises';
import { defaultI18n } from '@wordpress/i18n';
import { I18N } from 'i18n-calypso';
import getAssetFilePath from 'calypso/lib/get-asset-file-path';
import { getLanguageFile } from 'calypso/lib/i18n-utils/switch-locale';
import config from 'calypso/server/config';
import { LOCALE_SET } from 'calypso/state/action-types';
export function ssrSetupLocaleMiddleware() {
const translationsCache = {};
return function ssrSetupLocale( context, next ) {
function setLocaleData( localeData ) {
const i18n = new I18N();
i18n.setLocale( localeData );
if ( localeData ) {
defaultI18n.setLocaleData( localeData );
} else {
defaultI18n.resetLocaleData();
}
const localeSlug = i18n.getLocaleSlug();
const localeVariant = i18n.getLocaleVariant();
context.store.dispatch( { type: LOCALE_SET, localeSlug, localeVariant } );
context.lang = localeVariant || localeSlug;
context.i18n = i18n;
next();
}
const { lang } = context.params;
if ( ! lang ) {
setLocaleData( null );
return;
}
if ( ! config( 'magnificent_non_en_locales' ).includes( lang ) ) {
context.res.redirect( context.path.replace( `/${ lang }`, '' ) );
return;
}
const cachedTranslations = translationsCache[ lang ];
if ( cachedTranslations ) {
setLocaleData( cachedTranslations );
} else {
readFile( getAssetFilePath( `languages/${ lang }-v1.1.json` ), 'utf-8' )
.then( ( data ) => JSON.parse( data ) )
// Fall back to the remote one if the local translation file is not found.
.catch( () => getLanguageFile( lang ) )
.then( ( translations ) => {
translationsCache[ lang ] = translations;
setLocaleData( translations );
} )
.catch( () => setLocaleData( null ) );
}
};
}
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