I'm trying to save an image from a Flash AS3 to my server as a jpg file. I found some PHP code to do this, but I want to do this in Ruby. I'm not quite sure how to convert the following code to Ruby. It's mainly the $GLOBALS["HTTP_RAW_POST_ DATA"] part I don't know how to convert.

Code:
<?php

if ( isset ( $GLOBALS["HTTP_RAW_POST_DATA"] )) {

// get bytearray $im = $GLOBALS["HTTP_RAW_POST_DATA"];
...