<?php
namespace Aws;
use Aws\Api\Service;
use Aws\Exception\IncalculablePayloadException;
use Psr\Http\Message\RequestInterface;
/**
* @internal
*/
class StreamRequestPayloadMiddleware
{
private $nextHandler;
private $service;
/**
* Create a middleware wrapper function
*
* @param Service $service
* @return \Closure
*/
public static function wrap(Service $service)
{
return function (callable $handler) use ($service) {
return new self($handler, $service);
};
}
public function __construct(callable $nextHandler, Service $service)
{
$this->nextHandler = $nextHandler;
$this->service = $service;
}
public function __invoke(CommandInterface $command, RequestInterface $request)
{
$nextHandler = $this->nextHandler;
$operation = $this->service->getOperation($command->getName());
$contentLength = $request->getHeader('content-length');
$hasStreaming = false;
$requiresLength = false;
// Check if any present input member is a stream and requires the
// content length
foreach ($operation->getInput()->getMembers() as $name => $member) {
if (!empty($member['streaming']) && isset($command[$name])) {
$hasStreaming = true;
if (!empty($member['requiresLength'])) {
$requiresLength = true;
}
}
}
if ($hasStreaming) {
// Add 'transfer-encoding' header if payload size not required to
// to be calculated and not already known
if (empty($requiresLength)
&& empty($contentLength)
&& isset($operation['authtype'])
&& $operation['authtype'] == 'v4-unsigned-body'
) {
$request = $request->withHeader('transfer-encoding', 'chunked');
// Otherwise, make sure 'content-length' header is added
} else {
if (empty($contentLength)) {
$size = $request->getBody()->getSize();
if (is_null($size)) {
throw new IncalculablePayloadException('Payload'
. ' content length is required and can not be'
. ' calculated.');
}
$request = $request->withHeader(
'content-length',
$size
);
}
}
}
return $nextHandler($command, $request);
}
}