url2png.js

var API_KEY = "XXX";
var SECRET_KEY = "XXX";
var crypto = require('crypto');

var url2png = function() {
	this.generateLink = function(url) {
		var options = "?url="+url + "&viewport=1480x1037&thumbnail_max_width=500";
		var token = crypto.createHash('md5').update(options + SECRET_KEY).digest('hex');

		return "http://api.url2png.com/v6/"+API_KEY+"/"+token+"/png/"+options;
	};
};

module.exports = new url2png();