proof of concept for converting PDF to image in MODX Cloud

pdftojpeg.snippet.php

<?php
/**
 * Proof of Concept of PDF to image conversion, working in MODX Cloud
 */

$file = $scriptProperties['file'];
$targetFolder = $modx->getOption('target', $scriptProperties, '/assets/images');
$fullTargetFolderPath = MODX_BASE_PATH . $targetFolder;

if (!preg_match("/\.pdf$/", $file)) {
  return "PDF file not specified.";
}
$jpegFilename = basename($file, '.pdf') . '.jpg';

// instantiate Imagick 
$im = new Imagick();

$im->setResolution(100,100);
$im->readimage(MODX_BASE_PATH . $file . '[0]'); 
$im->setImageFormat('jpeg');    
$im->writeImage($fullTargetFolderPath . '/' . $jpegFilename); 
$im->clear(); 
$im->destroy();
return $targetFolder . '/' . $jpegFilename;