feat: get rid of disk access

src/languages.js

@@ -7,6 +7,14 @@ var async = require('async');
 var Languages = module.exports;
 var languagesPath = path.join(__dirname, '../build/public/language');
 
+Languages.timeagoCodes = [
+	'af', 'ar', 'az-short', 'az', 'bg', 'bs', 'ca', 'cs', 'cy', 'da', 'de-short', 'de', 'dv',
+	'el', 'en-short', 'en', 'es-short', 'es', 'et', 'eu', 'fa-short', 'fa', 'fi', 'fr-short', 'fr',
+	'gl', 'he', 'hr', 'hu', 'hy', 'id', 'is', 'it-short', 'it', 'ja', 'jv', 'ko', 'ky', 'lt', 'lv',
+	'mk', 'nl', 'no', 'pl', 'pt-br-short', 'pt-br', 'pt-short', 'pt', 'ro', 'rs', 'ru', 'rw', 'si',
+	'sk', 'sl', 'sr', 'sv', 'th', 'tr-short', 'tr', 'uk', 'uz', 'vi', 'zh-CN', 'zh-TW',
+];
+
 Languages.get = function (language, namespace, callback) {
 	fs.readFile(path.join(languagesPath, language, namespace + '.json'), { encoding: 'utf-8' }, function (err, data) {
 		if (err) {

src/middleware/header.js

@@ -1,6 +1,5 @@
 'use strict';
 
-var path = require('path');
 var async = require('async');
 var nconf = require('nconf');
 var jsesc = require('jsesc');
@@ -17,7 +16,6 @@ var translator = require('../translator');
 var privileges = require('../privileges');
 var languages = require('../languages');
 var utils = require('../utils');
-var file = require('../file');
 
 var controllers = {
 	api: require('../controllers/api'),
@@ -239,20 +237,18 @@ module.exports = function (middleware) {
 				async.parallel({
 					scripts: async.apply(plugins.fireHook, 'filter:scripts.get', []),
 					timeagoLocale: (next) => {
-						const userLang = res.locals.config.userLang;
-						const pathToLocaleFile = '/vendor/jquery/timeago/locales/jquery.timeago.' + utils.userLangToTimeagoCode(userLang) + '.js';
-
 						async.waterfall([
-							async.apply(languages.list),
-							(languages, next) => {
-								if (!languages.some(obj => obj.code === userLang)) {
-									return next(null, false);
-								}
+							async.apply(languages.listCodes),
+							(languageCodes, next) => {
+								const userLang = res.locals.config.userLang;
+								const timeagoCode = utils.userLangToTimeagoCode(userLang);
 
-								file.exists(path.join(__dirname, '../../public', pathToLocaleFile), next);
-							},
-							(exists, next) => {
-								next(null, exists ? (nconf.get('relative_path') + '/assets' + pathToLocaleFile) : null);
+								if (languageCodes.includes(userLang) && languages.timeagoCodes.includes(timeagoCode)) {
+									const pathToLocaleFile = '/vendor/jquery/timeago/locales/jquery.timeago.' + timeagoCode + '.js';
+									next(null, (nconf.get('relative_path') + '/assets' + pathToLocaleFile));
+								} else {
+									next(null, false);
+								}
 							},
 						], next);
 					},