How to keep persistent ftp connection in nodejs - node.js

Question

Can you please help me make a connection persistent script. I used jsftp node module to connect to ftp server. What I need to do is to check if the user is already authenticated every time he send a request. Thanks in advance! here's my code:
var Ftp = require('jsftp');
var dumpLog = function (event){
console.log('Code: '+ event.code);
console.log('Message: '+ event.text);
}
var FtpController = {
index : function (req , res) {
res.view('ftp/login');
},
auth : function (req , res){
// Initialize some common variables
var user = req.param('user');
var pass = req.param('pass');
var ftp = new Ftp({
host: req.param('host'),
port: req.param('port') // Defaults to 21
});
ftp.auth( user, pass, function (err , auth_res){
if (err) throw err;
dumpLog(auth_res);
});
res.view('ftp/folder');
},
serve_folder : function(req,res){
res.view('ftp/folder');
},
};
module.exports = FtpController;

Answer 1

Best way to do stuff like this is probably a policy, since you'll want to be able to apply the check to various controllers as you build out your app. Here's what your policy might look like:
// policies/ftpAuthenticated.js
module.exports = function loginToFTP (req, res, next) {
if (req.session.ftpAuthenticated) {
// Onward!
next();
}
else {
// authenticate here (we assume it works in this example)
var success = true;
if (success) {
// Track that the user is connected via ftp for next time
req.session.ftpAuthenticated = true;
// save the connection object
req.session.ftp = theFTPConnectionThing;
next();
}
// if an error occurs, use the default error handler
else {
next( new Error('Sorry, an error occurred authenticating with FTP') );
}
}
}