app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const swagger = require('./utils/swagger');
var indexRouter = require('./routes/index');
var urlChecksRouter = require('./routes/urlChecks');
const helmet = require("helmet");
const RateLimit = require("express-rate-limit");

var app = express();

swagger(app);
// view engine setup
app.set('views', path.join(__dirname, 'views'));

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/urls', urlChecksRouter);

app.use(
  helmet.contentSecurityPolicy({
    directives: {
      "script-src": ["'self'", "code.jquery.com", "cdn.jsdelivr.net"],
    },
  })
);

// Apply rate limiter
const limiter = RateLimit({
  windowMs: 1 * 60 * 1000, // 1 minute
  max: 20,
});
app.use(limiter);

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

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500).send({error:err.message});
});

module.exports = app;