server.js

const express = require('express');
const mcache = require('memory-cache');
const path = require('path');
const retrieve = require('./news-scraper/retrieve.js');

const app = express();

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "*");
  next();
});

const cache = (duration) => {
 	return (req, res, next) => {
    	let key = '__express__' + req.originalUrl || req.url
    	let cachedBody = JSON.parse(mcache.get(key))
    	if (cachedBody) {
      		res.json(cachedBody);
      		console.log(req.headers);
			console.log("request made");
      	return
   		} else {
      		res.sendResponse = res.send
      		res.send = (body) => {
        		mcache.put(key, body, duration * 1000);
        		res.sendResponse(body)
      	}
      	next()
    }
  }
}

app.get('/', function(req, res) {
	res.sendFile(path.join(__dirname + '/index.html'));

	console.log(req.headers);
	console.log("/ request made");
});


/* ----------------- Serve assets and JS scripts ----------------- */

app.get('/assets/favicon.png', function(req, res) {
	res.type('.js');
	res.sendFile(path.join(__dirname + '/assets/favicon.png'));

	console.log(req.headers);
	console.log("/assets/favicon.png request made");
});
app.get('/scripts/d3.js', function(req, res) {
	res.type('.js');
	res.sendFile(path.join(__dirname + '/scripts/d3.js'));

	console.log(req.headers);
	console.log("/scripts/d3.js request made");
});
app.get('/scripts/d3.layout.cloud.js', function(req, res) {
	res.type('.js');
	res.sendFile(path.join(__dirname + '/scripts/d3.layout.cloud.js'));

	console.log(req.headers);
	console.log("/scripts/d3.layout.cloud.js request made");
});
app.get('/scripts/d3.wordcloud.js', function(req, res) {
	res.type('.js');
	res.sendFile(path.join(__dirname + '/scripts/d3.wordcloud.js'));

	console.log(req.headers);
	console.log("/scripts/d3.wordcloud.js request made");
});
app.get('/scripts/words.js', function(req, res) {
	res.type('.js');
	res.sendFile(path.join(__dirname + '/scripts/words.js'));

	console.log(req.headers);
	console.log("/scripts/words.js request made");
});


/* ----------------- Serve data for word clouds ----------------- */

app.get('/general', cache(1800), function (req, res) {
	retrieve.getData(["worldnews", "news", "worldevents"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/general request made");
})
app.get('/science-and-technology', cache(1800), function (req, res) {
	retrieve.getData(["science", "technology"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/science-and-technology request made");
})
app.get('/canada', cache(1800), function (req, res) {
	retrieve.getData(["canada", "onguardforthee"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/canada request made");
})
app.get('/politics', cache(1800), function (req, res) {
	retrieve.getData(["politics", "ukpolitics", "eupolitics", "uspolitics"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/politics request made");
})
app.get('/entertainment', cache(1800), function (req, res) {
	retrieve.getData(["entertainment", "movies", "music", "books", "television"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/entertainment request made");
})
app.get('/sports', cache(1800), function (req, res) {
	retrieve.getData(["sports", "nba", "sportsHUB", "baseball", "basketball", "football", "hockey", "motorsports", "soccer", "mma", "running",
		"climbing", "snowboarding", "skiing", "cricket", "tennis", "cycling", "boxing", "skateboarding", "golf"]).then(res.json.bind(res));

	console.log(req.headers);
	console.log("/sports request made");
})

/* ---------------------------------- */

port_number = app.listen(process.env.PORT || 3000)
app.listen(port_number);