A cat facts bot for slack outgoing webhook

catfacts.js

var http = require('http');

var port = process.env.PORT || 8888;
var name = 'catfacts';

function handle (req, res) {
  res.setHeader('Content-Type', 'application/json');

  if (req.method === 'POST') {
    var body = '';

    req.on('data', function(chunk) {
      body += chunk;
    });

    req.on('end', function() {
      parse(body, function(error, result) {
        var reply = {};
        if (error) {
          reply.text = error;
        } else {
          reply.text = result;
        }

        res.end(JSON.stringify(reply));
      });
    });

  } else {
    return res.end();
  }
}

function parse (text, callback) {
  var result = '';
  var url = 'http://catfacts-api.appspot.com/api/facts';
  var body = '';

  // get cat fact
  http.get(url, function(res) {
    res.on('data', function(chunk) {
      body += chunk;
    });

    res.on('end', function() {
      try {
        body = JSON.parse(body);
        if (body.success === 'true') {
          result = body.facts[0];
        }

        callback(null, result);
      } catch (e) {
        callback(e);
      }
    });

  }).on('error', function(error) {
    callback(error);
  });
}

var server = http.createServer(handle);

server.listen(port, function() {
  console.log(name + ' listening on port ' + port);
});