base64.js

var fs = require('fs');
var http = require('http');
var url = require('url');

var file  = './hyperdrive.jpg';
var blogId = 10231312;
var username = 'redacted';
var password = 'redacted';
var endpoint = 'http://example.com/';
var destination = url.parse(endpoint);

if(file){
  var read = fs.createReadStream(file, { flags: 'r', encoding: null, mode: 0666, bufferSize:1024 });

  var local = http.createClient((destination.port || 80), destination.hostname);
  var request = local.request('POST', destination.pathname);
  
  var front = '<?xml version="1.0" ?><methodCall><methodName>wp.uploadFile</methodName>';
  front += '<params>';
  front += '<param><int>' + blogId + '</int></param>';
  front += '<param><string>' + username + '</string></param>';
  front += '<param><string>' + password + '</string></param>';
  front += '<param><base64>';
  
  var back = '</base64></param></params></methodCall>';
  
  request.write(front);
  
  read.setEncoding('base64');
  request.on('drain', function(){
    read.resume();
  });
  read.on('data', function(data){
    if(!write.write(data)){
      read.pause();
    }
  });
  read.on('error', function(exception){
    future.result = exception;
    future.returnValue = false;
  });
  read.on('end', function(){
    request.write(back);
    request.end();
  });
  
  request.on('response', function(response){
    response.on('end', function(){
      var result = { status: response.statusCode };    
      console.log(result);
    })
  });
  
}