//URL Shortener
//npm install express express-rate-limit shortid
/*
TODO for production environment:
Save Shortened URLs in a SQL Database (or noSQL)
Choose a different storage for express-rate-limit (redis, etc.)
Use NodeJS Cluster to get better performance
Better tune the rateLimit
*/
var express = require("express");
var rateLimit = require("express-rate-limit");
var shortid = require("shortid");
const PORT = 3000;
const HOSTNAME = "http://localhost:3000/";
//^ Main Location with trailing slash
var app = express();
app.use(express.json());
app.use(express.urlencoded({ extended:true}));
var urls = {};
const limiter = rateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100 // limit each IP to 100 requests per windowMs
});
if (app.get('env') === 'production') {
app.set('trust proxy', 1) // trust first proxy
}
app.use("/s",limiter); //only limit url shortenings, not website hits
app.get("/",function(req,res){
res.send(html);
});
app.post("/s",function(req,res){
//use redis or mysql here
if(req.body.url==""||req.body.url==null){
res.redirect("/");
return;
}
let id = shortid.generate()
urls[id] = req.body.url;
res.send("
"+HOSTNAME+id+"
");
});
app.get("/:id",function(req,res){
if(req.params.id in urls){
res.redirect(urls[req.params.id]);
}
});
const html = `
URL Shortener | shira.at
URL Shortener
`
app.listen(PORT, () => console.log("Now listening on *:"+PORT));