index.js

// Modules
const express = require("express");
const mongoose = require("mongoose");
const session = require("express-session");
const mongoStore = require("connect-mongo")(session);
const hbs = require("express-handlebars");

// Handlebars helpers
const helpers = require("./helpers");

// Models
const Scraper = require("./models/scraper");

// Controllers
const ScraperController = require("./controllers/scraper");
const NewsController = require("./controllers/news");

// Options
const Options = require("./options");

// Initialization of the application
const app = express();
const PORT = process.env.PORT || 3000;

// Connecting to database
mongoose.connect(
  "mongodb://admin:prasowaadmin12@ds018839.mlab.com:18839/generator-prasowek",
  { useNewUrlParser: true, useUnifiedTopology: true }
);

var store = new mongoStore({
  mongooseConnection: mongoose.connection
});

// Initialization of session
app.use(
  session({
    secret: "grg",
    store: store,
    resave: false,
    saveUninitialized: false,
    cookie: {
      expires: 5 * 60 * 60 * 100
    }
  })
);

// Setting up a view engine
app.engine(
  "hbs",
  hbs({
    extname: "hbs",
    defaultView: "main",
    layoutsDir: __dirname + "/views/layouts/",
    partialsDir: __dirname + "/views/partials/",
    helpers: helpers
  })
);
app.set("view engine", "hbs");

// Serving static files
app.use(express.static("public"));

// Creating scrapers
var s1 = new Scraper({
  source: "prasowki.org"
});
var s2 = new Scraper({
  source: "prasowkinawos.pl"
});
var scraperController = new ScraperController([s1, s2]);

async function manageDatabase() {
  await NewsController.saveNews(await scraperController.getNews());
  NewsController.clearNews();
}
manageDatabase();

// Manages database every hour
setInterval(manageDatabase, 1000 * 60 * 60 * 24);

// Middlewares
app.use(function(req, res, next) {
  next();
});

// Routes

app.use("/kategoria", require("./routes/category"));
app.use("/artykul", require("./routes/article"));
app.use("/generator", require("./routes/generator"));

app.get("/konfigurator", async (req, res) => {
  let limits = {
    both: await NewsController.countNews()
  };
  for (let category in Options.categories) {
    limits[category] = await NewsController.countNews(
      Options.categories[category]
    );
  }

  res.render("configuration", {
    limits
  });
});

app.get("/:page?", async (req, res) => {
  let page = req.params.page - 1 || 0;
  let news = await NewsController.loadNews({
    skip: page * Options.postsOnPage,
    limit: Options.postsOnPage
  });
  let newsQantity = await NewsController.countNews();
  res.render("home", {
    news,
    page: page + 1,
    pages: Math.ceil(newsQantity / Options.postsOnPage)
  });
});

// Listening to the port
app.listen(PORT, () => {
  console.log("App is listening on port: " + PORT);
});