server.js

// server.js

// BASE SETUP
// =============================================================================

// call the packages we need
var express    = require('express');        // call express
var app        = express();                 // define our app using express
var bodyParser = require('body-parser');
var request    = require('request');
var cheerio    = require('cheerio');
var _          = require('underscore');

// configure app to use bodyParser()
// this will let us get the data from a POST
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var port = process.env.PORT || 8081;        // set our port

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

// middleware to use for all requests
router.use(function(req, res, next) {
    res.setHeader("Access-Control-Allow-Origin", "*");
    // do logging
    console.log('Something is happening.');
    next(); // make sure we go to the next routes and don't stop here
});


// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to lyric-api!\nuse /find/artist/song' });   
});

// more routes for our API will happen here

router.route('/find/:artist/:song')

	.get(function(req,res) {
		
		var lyrics = "";

		url = 'http://lyrics.wikia.com/wiki/' + req.params.artist + ':' + req.params.song;


		request(url, function(error, response, html) {
	        if(error)
	        {
	       		res.json({lyric:"", err:error});
	        }
	        else
	        {
		        
		        var $ = cheerio.load(html);
		        $('script').remove();
		        var lyrics = ($('.lyricbox').html());

				/**
				 * Override default underscore escape map
				 */
				var escapeMap = {
				  '&': '&',
				  '<': '&lt;',
				  '>': '&gt;',
				  '"': '&quot;',
				  "'": '&#x27;',
				  "'": '&apos;',
				  '`': '&#x60;',
				  '' : '\n'
				};
				var unescapeMap = _.invert(escapeMap);
				var createEscaper = function(map) {
				  var escaper = function(match) {
				    return map[match];
				  };

				  var source = '(?:' + _.keys(map).join('|') + ')';
				  var testRegexp = RegExp(source);
				  var replaceRegexp = RegExp(source, 'g');
				  return function(string) {
				    string = string == null ? '' : '' + string;
				    return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
				  };
				};
				_.escape = createEscaper(escapeMap);
				_.unescape = createEscaper(unescapeMap);

				// replace html codes with punctuation
				lyrics = _.unescape(lyrics);
				// remove everything between brackets
				lyrics = lyrics.replace(/\[[^\]]*\]/g, '');
				// remove html comments
				lyrics = lyrics.replace(/(<!--)[^-]*-->/g, '');
				// replace newlines
				lyrics = lyrics.replace(/<br>/g, '\n');
				// remove all tags
				lyrics = lyrics.replace(/<[^>]*>/g, '');


		        if(lyrics != ""){
		        	res.json({lyric:lyrics, err:"none"});
		        }
		        else{
		        	res.json({lyric:"", err: "not found"});
		        }
		    }
		});

	});


// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api
app.use('/api', router);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);