usd2brl.js

var http = require('http'),
    request = require('request');
    x = '',
    port = process.env.PORT || 8080;

http.createServer(function(req, response) {

    http.get({
        host: 'query.yahooapis.com',
        path: "/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%27www.google.com%2Ffinance%2Fconverter%3Fa%3D1%26from%3DUSD%26to%3DBRL%27%20and%20xpath%3D%27%2F%2F*%5B%40id%3D" + '"currency_converter_result"' + "%5D%2Fspan%2Ftext()%27&format=json&callback="
    }, function(res) {
        res.on('data', function(d) { x += d.toString(); });
        res.on('end', next);
    }).on('error', function(e) {
      console.log("Got error: " + e.message);
      response.writeHead(408, {'Content-Type': 'text/plain'});
      response.end('Timeout bro!');
    });

    function next() {
        var l = JSON.parse(x);
            x = '',
            result="1 USD = " + l.query.results;

        if(req.method === 'GET') {
            response.writeHead(200, {'Content-Type': 'text/plain'})
            response.end(result);
        } else if(req.method === 'POST') {
            var payload = {"text": result, "icon_emoji": ":heavy_dollar_sign:", "username": "USD-to-BRL"};
            request.post(<CHANNEL_URI>).form({payload: JSON.stringify(payload)});
            response.end();
        }
    }

}).listen(port);