app.ts

/**
 * Configuration for Express server.
 * @module
 */

import express from 'express';
import logger from 'morgan';
import cookieParser from 'cookie-parser';
import passport from 'passport';
import session from 'express-session';
import MongoDBStore from 'connect-mongodb-session';
import dotenv from 'dotenv-flow';
import serverlessExpress from '@vendia/serverless-express';
// load env
dotenv.config();

// Configs
import { DB_NAME, COLLECTION_NAMES } from './helpers/mongo';

// Custom Routes
import coursesRouter from './controllers/courses';
import professorsRouter from './controllers/professors';
import scheduleRouter from './controllers/schedule';
import reviewsRouter from './controllers/reviews';
import usersRouter from './controllers/users';
import roadmapRouter from './controllers/roadmap';
import reportsRouter from './controllers/reports';

import { SESSION_LENGTH } from './config/constants';

// instantiate app
const app = express();

// Setup mongo store for sessions
const mongoStore = MongoDBStore(session);

if (process.env.MONGO_URL) {
  const store = new mongoStore({
    uri: process.env.MONGO_URL,
    databaseName: DB_NAME,
    collection: COLLECTION_NAMES.SESSIONS,
  });
  // Catch errors
  store.on('error', function (error) {
    console.log(error);
  });
  // Setup Passport and Sessions
  app.use(
    session({
      secret: process.env.SESSION_SECRET,
      resave: false,
      saveUninitialized: false,
      cookie: { maxAge: SESSION_LENGTH },
      store: store,
    }),
  );
  app.use(passport.initialize());
  app.use(passport.session());
  require('./config/passport');
} else {
  console.log('MONGO_URL env var is not defined!');
}

/**
 * Configure Express.js Middleware
 */

app.use(express.json());
app.use(logger('dev'));
app.use(cookieParser());
app.use(function (_, res, next) {
  res.header('x-powered-by', 'serverless-express');
  next();
});

/**
 * Routes - Public
 */

// Enable custom routes
const router = express.Router();
router.use('/courses', coursesRouter);
router.use('/professors', professorsRouter);
router.use('/schedule', scheduleRouter);
router.use('/reviews', reviewsRouter);
router.use('/users', usersRouter);
router.use('/roadmap', roadmapRouter);
router.use('/reports', reportsRouter);
app.use('/api', router);

/**
 * Error Handler
 */
app.use(function (req, res) {
  console.error(req);
  res.status(500).json({ error: `Internal Serverless Error - '${req}'` });
});

// run local dev server
const NODE_ENV = process.env.NODE_ENV ?? 'development';
if (NODE_ENV === 'development') {
  const port = process.env.PORT ?? 8080;
  app.listen(port, () => {
    console.log('Listening on port', port);
  });
}

// export for serverless
export const handler = serverlessExpress({ app });