<?php
$e = &$modx->event;
if (!function_exists('optimizeJPG')) {
    function optimizeJPG($file) {
        $ext = strtolower(end(explode('.', $file)));
        if ($ext == 'jpeg' || $ext == 'jpg') {
            $cmd = '/usr/bin/jpegtran -optimize -progressive -copy none -outfile '.escapeshellarg($file.'_').' '.escapeshellarg($file);
            exec($cmd, $result, $return_var);
            if (file_exists ($file.'_') && filesize($file) > filesize($file.'_')) {
                rename($file.'_',$file);
            } else {
                unlink($file.'_');
            }

        }
    }
}
if ($e->name == "OnFileManagerUpload") {
$msProperties = $source->get('properties');
$path = realpath(MODX_BASE_PATH.$msProperties['basePath']['value'].$directory);
optimizeJPG($path.'/'.$files['file']['name']);
}