app.js

import express from "express";
import compression from "compression";
import bodyParser from "body-parser";
import cookieParser from "cookie-parser";
import Handlebars from "handlebars";
import { engine } from "express-handlebars";

import indexRoute from "./routes/index.js";
import aboutRoute from "./routes/about.js";
import joinRoute from "./routes/join.js";
import learnRoute from "./routes/learn.js";
import sitemapRoute from "./routes/sitemap.js";

import { I18n } from "i18n";
import fs from "fs";
import path from "node:path";
import { readdirSync, readFileSync } from "fs";
import { fileURLToPath } from "node:url";

import sortArrayOfObjects from "./modules/sort-array-of-objects.js";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
let translationData = [],
  locales = [];

readdirSync(`${__dirname}/locales`)
  .filter((file) => path.extname(file) === ".json")
  .forEach((locale) => {
    locale = locale.replace(".json", "");
    locales.push(locale);

    const translationDataObj = JSON.parse(
      fs.readFileSync(
        `${__dirname}/translations/${locale}/${locale}.json`,
        "utf8"
      )
    );
    translationDataObj.code = locale;
    translationData.push(translationDataObj);
  });

const i18n = new I18n({
  directory: path.join(__dirname, "locales"),
  autoReload: true,
  defaultLocale: "en-us",
  queryParameter: "lang",
  cookie: "locale",
});

Handlebars.registerHelper("__", function () {
  return i18n.__.apply(this, arguments);
});

Handlebars.registerHelper("__n", function () {
  return i18n.__n.apply(this, arguments);
});

Handlebars.registerHelper("ifEquals", (firstArg, secondArg, options) => {
  return firstArg === secondArg ? options.fn(this) : options.inverse(this);
});

const app = express();

app.use(compression());
app.use(express.static("public"));

app.use(
  bodyParser.urlencoded({
    extended: true,
  })
);

app.use(cookieParser());
app.use(bodyParser.json());

app.use(i18n.init);

app.use((req, res, next) => {
  const cookies = cookieParser.JSONCookies(req.cookies);
  let currentLocale = "en-us";

  res.locals.languages = i18n.getLocales();
  res.translations = sortArrayOfObjects(translationData, "label_lat");

  if (req.query.lang) {
    currentLocale = req.query.lang;
  } else if (cookies && cookies.locale) {
    currentLocale = cookies.locale;
  } else if (req.getLocale()) {
    currentLocale = req.getLocale();
  }

  try {
    res.currentLocale = translationData.filter(
      (locale) => locale.code === currentLocale
    )[0];
  } catch (err) {
    /* noop */
  }

  res.cookie("locale", currentLocale, {
    maxAge: 365 * 24 * 60 * 60 * 1000
  });
  next();
});

app.engine("handlebars", engine());
app.set("view engine", "handlebars");
app.set("views", "./views");

app.use("/", indexRoute);
app.use("/about", aboutRoute);
app.use("/join", joinRoute);
app.use("/learn", learnRoute);
app.use("/sitemap.xml", sitemapRoute);

export default app;