<?php
declare(strict_types=1);
namespace Http\Client\Common\Plugin;
use Http\Client\Common\Plugin;
use Http\Message\Encoding;
use Http\Promise\Promise;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
/**
* Allow to decode response body with a chunk, deflate, compress or gzip encoding.
*
* If zlib is not installed, only chunked encoding can be handled.
*
* If Content-Encoding is not disabled, the plugin will add an Accept-Encoding header for the encoding methods it supports.
*
* @author Joel Wurtz <joel.wurtz@gmail.com>
*/
final class DecoderPlugin implements Plugin
{
/**
* @var bool Whether this plugin decode stream with value in the Content-Encoding header (default to true).
*
* If set to false only the Transfer-Encoding header will be used
*/
private $useContentEncoding;
/**
* @param array{'use_content_encoding'?: bool} $config
*
* Configuration options:
* - use_content_encoding: Whether this plugin should look at the Content-Encoding header first or only at the Transfer-Encoding (defaults to true)
*/
public function __construct(array $config = [])
{
$resolver = new OptionsResolver();
$resolver->setDefaults([
'use_content_encoding' => true,
]);
$resolver->setAllowedTypes('use_content_encoding', 'bool');
$options = $resolver->resolve($config);
$this->useContentEncoding = $options['use_content_encoding'];
}
public function handleRequest(RequestInterface $request, callable $next, callable $first): Promise
{
$encodings = extension_loaded('zlib') ? ['gzip', 'deflate'] : ['identity'];
if ($this->useContentEncoding) {
$request = $request->withHeader('Accept-Encoding', $encodings);
}
$encodings[] = 'chunked';
$request = $request->withHeader('TE', $encodings);
return $next($request)->then(function (ResponseInterface $response) {
return $this->decodeResponse($response);
});
}
/**
* Decode a response body given its Transfer-Encoding or Content-Encoding value.
*/
private function decodeResponse(ResponseInterface $response): ResponseInterface
{
$response = $this->decodeOnEncodingHeader('Transfer-Encoding', $response);
if ($this->useContentEncoding) {
$response = $this->decodeOnEncodingHeader('Content-Encoding', $response);
}
return $response;
}
/**
* Decode a response on a specific header (content encoding or transfer encoding mainly).
*/
private function decodeOnEncodingHeader(string $headerName, ResponseInterface $response): ResponseInterface
{
if ($response->hasHeader($headerName)) {
$encodings = $response->getHeader($headerName);
$newEncodings = [];
while ($encoding = array_pop($encodings)) {
$stream = $this->decorateStream($encoding, $response->getBody());
if (false === $stream) {
array_unshift($newEncodings, $encoding);
continue;
}
$response = $response->withBody($stream);
}
if (\count($newEncodings) > 0) {
$response = $response->withHeader($headerName, $newEncodings);
} else {
$response = $response->withoutHeader($headerName);
}
}
return $response;
}
/**
* Decorate a stream given an encoding.
*
* @return StreamInterface|false A new stream interface or false if encoding is not supported
*/
private function decorateStream(string $encoding, StreamInterface $stream)
{
if ('chunked' === strtolower($encoding)) {
return new Encoding\DechunkStream($stream);
}
if ('deflate' === strtolower($encoding)) {
return new Encoding\DecompressStream($stream);
}
if ('gzip' === strtolower($encoding)) {
return new Encoding\GzipDecodeStream($stream);
}
return false;
}
}
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