将aws / aws-sdk-php与Google云端存储配合使用

https://developers.google.com/storage/docs/migrating#migration-simple

有谁知道我是否可以使用aws / aws-sdk-php(https://packagist.org/packages/aws/aws-sdk-php)软件包并将其配置为连接到我的Google云端存储而不是AWS S3？

我试过以下代码：

<?php 
use AwsS3S3Client;
use LeagueFlysystemFilesystem;
use LeagueFlysystemAdapterAwsS3 as Adapter;
require_once 'vendor/autoload.php';
error_reporting(E_ALL & ~E_NOTICE);
ini_set('display_errors',1);


$client = S3Client::factory(array(
    'key'    => 'MY_GCS_KEY','secret' => 'MY_GCS_SECRET','endpoint' => 'storage.googleapis.com'
));
$filesystem = new Filesystem(new Adapter($client,'MY_GCS_BUCKET'));
$filesystem->write('filename.txt','contents');

但这给了我一个错误：

Fatal error: Uncaught AwsS3ExceptionInvalidAccessKeyIdException: AWS Error Code: InvalidAccessKeyId,Status Code: 403,AWS Request ID: BF7C1317719A4C67,AWS Error Type: client,AWS Error Message: The AWS Access Key Id you provided does not exist in our records.,User-Agent: aws-sdk-php2/2.6.15 Guzzle/3.9.2 curl/7.32.0 PHP/5.5.4-1+debphp.org~raring+1 thrown in /var/www/prudhub/dev/vendor/aws/aws-sdk-php/src/Aws/Common/Exception/NamespaceExceptionFactory.php on line 91

任何人都知道如何或者我是否可以正确设置aws / aws-sdk-php包以连接到Google云端存储？

编辑

以下是使其工作的代码：

<?php 
use AwsS3S3Client;
use LeagueFlysystemFilesystem;
use LeagueFlysystemAdapterAwsS3 as Adapter;
require_once 'vendor/autoload.php';


$client = S3Client::factory(array(
    'key'    => 'MY_GCS_KEY','base_url' => 'https://storage.googleapis.com'
));
$filesystem = new Filesystem(new Adapter($client,'contents');