google drive failu nuskaitymas su php

//reikalingas service accont iš https://console.developers.google.com
$client = new Google_Client();

$credentialsFile = __DIR__ . '/googleserviceaccount.json';

if (!file_exists($credentialsFile)) {
    throw new RuntimeException('Service account credentials Not Found!');
}

$client->setAuthConfig($credentialsFile);
$client->setApplicationName("Service Account Example");
$client->setScopes(Google_Service_Drive::DRIVE);

$service = new Google_Service_Drive($client);

//glaime rodyti tik is tam tikro folderio
$files = $service->files->listFiles(array('q' => "'0B6Gt1nOByOdfsdfdsfsdZ3BqOGc' in parents"));
//failu sarasas
var_dump($files);

//failo turinys
$content = $service->files->export('13yrUsfsdfdsfsdfsdf454u_LC1eJA1mNs', 'text/html', array(
  'alt' => 'media' ));

var_dump($content->getBody()->read(1024));