Textbox.io 2.x Documentation : Node.js Upload Handler

var http = require('http');
var fs = require('fs');
var multiparty = require('multiparty'); // https://www.npmjs.com/package/multiparty

// #### #### #### #### #### #### #### #### ####
//  Setup the Textbox.io Example Post Acceptor
// #### #### #### #### #### #### #### #### #### 
// Set the URL and port for the post acceptor
var acceptorPath = '/upload';
var acceptorPort = 8080;
// Only these origins will be allowed to upload images
var allowedOrigins = ['http://localhost', 'http://192.168.1.1'];
// Set the upload directory
// Notw: This string is prepended to the filename to construct
// the image url returned to the Textbox.io editor, like: uploadDirectory/filename.png
var uploadDirectory = 'images/';
// Set the resource URL for from which stored images will be served.
var resourceUrl = 'http://localhost/';
// #### #### #### #### #### #### #### #### #### 
// #### #### #### #### #### #### #### #### #### 

http.createServer(function(req, res) {
  var origin = req.headers.origin;
  if(allowedOrigins.indexOf(origin) == -1) { 
    // Deny invalid origins
    res.writeHead(403, { 'HTTP/1.0 403 Origin Denied' : origin });
    res.end();
  } else {
    // For valid origins check path and method
    if (req.url === acceptorPath && req.method === 'POST') {
      var form = new multiparty.Form();
      form.parse(req);
      form.on('file', function(name, file) {
        var saveFilePath = uploadDirectory + file.originalFilename;
        fs.rename(file.path, saveFilePath, function(err) {
          if (err) {
            // Handle problems with file saving
            res.writeHead(500);
            res.end();
          } else {
            // Respond to the successful upload with JSON.
            // Use a location key to specify the path to the saved image resource.
            // { location : '/your/uploaded/image/file'}
            var textboxResponse = JSON.stringify({ 
              location : saveFilePath 
            });
            
            // If your script needs to receive cookies, set images.upload.credentials:true in
            // the Textbox.io configuration and enable the following two headers.
            // res.setHeader('Access-Control-Allow-Credentials', 'true');
            // res.setHeader('P3P', 'CP="There is no P3P policy."');
            res.statusCode = 200;
            res.setHeader('Access-Control-Allow-Origin', origin);
            res.end(textboxResponse);
          } 
        });
      });
      form.on('error', function(err) {
        res.writeHead(500);
        res.end();
      });
      return;
    
    } else {
      // Return 404 for requests for other paths/methods
      res.writeHead(404);
      res.end();
    }
  }
}).listen(acceptorPort);