Koa.js curl proxy with ntlm authentication

curl-proxy.js

var spawn = require('child_process').spawn;
var eventStream = require('./event-stream');
var compose = require('koa-compose');

//get username / password from somewhere
var username = ...;
var password = ...;
var credential = username + ':' + password;

//8 hour timeout
var timeout = 8 * 60 * 60;

module.exports = function curlProxy(url) {
  return compose([
    eventStream(),
    function *() {
      var child = spawn('curl', ['--ntlm', '-u', credential, '-N', '-m', timeout.toString(), url], {
        //ignore stdio and stderr so they don't fill up and cause stdout to pause
        stdio: ['ignore', 'pipe', 'ignore']
      });
      this.body = child.stdout;
    }
  ]);
}