<?php
namespace Aws\S3;
use Aws\CommandInterface;
use GuzzleHttp\Psr7;
use Psr\Http\Message\RequestInterface;
/**
* Apply required or optional MD5s to requests before sending.
*
* IMPORTANT: This middleware must be added after the "build" step.
*
* @internal
*/
class ApplyChecksumMiddleware
{
private static $md5 = [
'DeleteObjects',
'PutBucketCors',
'PutBucketLifecycle',
'PutBucketLifecycleConfiguration',
'PutBucketPolicy',
'PutBucketTagging',
];
private static $sha256 = [
'PutObject',
'UploadPart',
];
private $nextHandler;
/**
* Create a middleware wrapper function.
*
* @return callable
*/
public static function wrap()
{
return function (callable $handler) {
return new self($handler);
};
}
public function __construct(callable $nextHandler)
{
$this->nextHandler = $nextHandler;
}
public function __invoke(
CommandInterface $command,
RequestInterface $request
) {
$next = $this->nextHandler;
$name = $command->getName();
$body = $request->getBody();
if (in_array($name, self::$md5) && !$request->hasHeader('Content-MD5')) {
// Set the content MD5 header for operations that require it.
$request = $request->withHeader(
'Content-MD5',
base64_encode(Psr7\hash($body, 'md5', true))
);
} elseif (in_array($name, self::$sha256) && $command['ContentSHA256']) {
// Set the content hash header if provided in the parameters.
$request = $request->withHeader(
'X-Amz-Content-Sha256',
$command['ContentSHA256']
);
}
return $next($command, $request);
}
}
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