gistfile1.php

function ithra_softlayer_download_file($account, $fid) {
  
  $file = db_select('ithra_softlayer_objectstorage', 'os')
      ->fields('os')
      ->condition('uid', $account->uid, '=')
      ->condition('fid', $fid, '=')            
      ->execute()->fetchObject(); 
  
  if (!$file) {
    drupal_not_found();
  }
  else {
  
    $path = libraries_get_path(SOFTLAYER_LIBRARY_PATH);
    $objectStorageDirectory = $path . DIRECTORY_SEPARATOR . 'lib'. DIRECTORY_SEPARATOR . 'ObjectStorage';
    set_include_path(get_include_path() . PATH_SEPARATOR . $objectStorageDirectory);
    require_once($objectStorageDirectory . '/Util.php');

    $host = variable_get('ithra_softlayer_host', ITHRA_SOFTLAYER_HOST);
    $username = variable_get('ithra_softlayer_username', ITHRA_SOFTLAYER_USERNAME);
    $password = variable_get('ithra_softlayer_password', ITHRA_SOFTLAYER_PASS);

    $objectStorage = new ObjectStorage($host, $username, $password);

    $object = $objectStorage->with(variable_get('ithra_softlayer_container_name', 'test_container') . '/' . $account->uid . '/' . $file->filename)->get();      

    $authData = $objectStorage->getAuthenticationData();

    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, $object->getUrl()); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("X-Auth-Token: {$authData->authToken}"));
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
    ini_set('memory_limit','128M');
    $content = curl_exec($ch);
    curl_close($ch); 

    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=' . $file->filename);
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . strlen($content));
    ob_clean();
    flush();
    echo $content;
    flush();
  }
}