app.js

const createError = require("http-errors");
const express = require("express");
const cookieParser = require("cookie-parser");
const logger = require("morgan");
const mongoose = require("mongoose");
const cors = require("cors");
require("dotenv").config();

const apiRouter = require("./routes/api_route");
// const swaggerUi = require('swagger-ui-express');
// const swaggerDocument = require('./swagger.json');

const {
  DB_HOST: db_host,
  DB_NAME: db_name,
  COOKIE_AUTH: cookie_auth,
  TOKEN_AUTH: token_auth,
  SECRET_KEY: secret,
  API_BASE_URL: api_base_url,
} = process.env;

if (cookie_auth == "true") {
  var session = require("express-session");
  var MongoStore = require("connect-mongo")(session);
}

const app = express();

app.use(cors());
app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
// app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument));

mongoose.connect(`mongodb://${db_host}/${db_name}`, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});
mongoose.Promise = global.Promise;
const db = mongoose.connection;

db.on("connected", function () {
  console.log("Database connected successfully");
});

db.on("error", function (err) {
  console.log("Error occured during database connection");
});

if (cookie_auth == "true") {
  app.use(cookieParser());
  app.use(
    session({
      store: new MongoStore({
        url: `mongodb://${db_host}/${db_name}`,
      }),
      cookie: { maxAge: 1 * 60 * 60 * 1000 },
      secret: secret,
      resave: false,
      saveUninitialized: false,
    })
  );
}

app.use(api_base_url, apiRouter);

// catch 404 and forward to error handler
app.use((req, res, next) => {
  next(createError(404));
});

if (process.env.NODE_ENV === "production") {
  // Do not send stack trace of error message when in production
  app.use((err, req, res, next) => {
    res.status(err.status || 500);
    res.send("Error occurred while handling the request.");
  });
} else {
  // Log stack trace of error message while in development
  app.use((err, req, res, next) => {
    res.status(err.status || 500);
    console.log(err);
    res.send(err.message);
  });
}

module.exports = app;