var express = require('express');
var app = express();

// set up rate limiter: maximum of five requests per minute
var RateLimit = require('express-rate-limit');
var limiter = new RateLimit({
  windowMs: 1*60*1000, // 1 minute
  max: 5
});

// apply rate limiter to all requests
app.use(limiter);

app.get('/:path', function(req, res) {
  let path = req.params.path;
  if (isValidPath(path))
    res.sendFile(path);
});