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<?php
namespace Aws;
use GuzzleHttp\Psr7;
use Psr\Http\Message\RequestInterface;
/**
* Used to compress request payloads if the service/operation support it.
*
* IMPORTANT: this middleware must be added after the "build" step.
*
* @internal
*/
class RequestCompressionMiddleware
{
private $api;
private $minimumCompressionSize;
private $nextHandler;
private $encodings;
private $encoding;
private $encodingMap = [
'gzip' => 'gzencode'
];
/**
* Create a middleware wrapper function.
*
* @return callable
*/
public static function wrap(array $config)
{
return function (callable $handler) use ($config) {
return new self($handler, $config);
};
}
public function __construct(callable $nextHandler, $config)
{
$this->minimumCompressionSize = $this->determineMinimumCompressionSize($config);
$this->api = $config['api'];
$this->nextHandler = $nextHandler;
}
public function __invoke(CommandInterface $command, RequestInterface $request)
{
if (isset($command['@request_min_compression_size_bytes'])
&& is_int($command['@request_min_compression_size_bytes'])
&& $this->isValidCompressionSize($command['@request_min_compression_size_bytes'])
) {
$this->minimumCompressionSize = $command['@request_min_compression_size_bytes'];
}
$nextHandler = $this->nextHandler;
$operation = $this->api->getOperation($command->getName());
$compressionInfo = isset($operation['requestcompression'])
? $operation['requestcompression']
: null;
if (!$this->shouldCompressRequestBody(
$compressionInfo,
$command,
$operation,
$request
)) {
return $nextHandler($command, $request);
}
$this->encodings = $compressionInfo['encodings'];
$request = $this->compressRequestBody($request);
return $nextHandler($command, $request);
}
private function compressRequestBody(
RequestInterface $request
) {
$fn = $this->determineEncoding();
if (is_null($fn)) {
return $request;
}
$body = $request->getBody()->getContents();
$compressedBody = $fn($body);
return $request->withBody(Psr7\Utils::streamFor($compressedBody))
->withHeader('content-encoding', $this->encoding);
}
private function determineEncoding()
{
foreach ($this->encodings as $encoding) {
if (isset($this->encodingMap[$encoding])) {
$this->encoding = $encoding;
return $this->encodingMap[$encoding];
}
}
return null;
}
private function shouldCompressRequestBody(
$compressionInfo,
$command,
$operation,
$request
){
if ($compressionInfo) {
if (isset($command['@disable_request_compression'])
&& $command['@disable_request_compression'] === true
) {
return false;
} elseif ($this->hasStreamingTraitWithoutRequiresLength($command, $operation)
) {
return true;
}
$requestBodySize = $request->hasHeader('content-length')
? (int) $request->getHeaderLine('content-length')
: $request->getBody()->getSize();
if ($requestBodySize >= $this->minimumCompressionSize) {
return true;
}
}
return false;
}
private function hasStreamingTraitWithoutRequiresLength($command, $operation)
{
foreach ($operation->getInput()->getMembers() as $name => $member) {
if (isset($command[$name])
&& !empty($member['streaming'])
&& empty($member['requiresLength'])
){
return true;
}
}
return false;
}
private function determineMinimumCompressionSize($config) {
if (is_callable($config['request_min_compression_size_bytes'])) {
$minCompressionSz = $config['request_min_compression_size_bytes']();
} else {
$minCompressionSz = $config['request_min_compression_size_bytes'];
}
if ($this->isValidCompressionSize($minCompressionSz)) {
return $minCompressionSz;
}
}
private function isValidCompressionSize($compressionSize)
{
if (is_numeric($compressionSize)
&& ($compressionSize >= 0 && $compressionSize <= 10485760)
) {
return true;
}
throw new \InvalidArgumentException(
'The minimum request compression size must be a '
. 'non-negative integer value between 0 and 10485760 bytes, inclusive.'
);
}
}
|
