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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\AppFramework\Middleware;
use OC\AppFramework\OCS\BaseResponse;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\JSONResponse;
use OCP\AppFramework\Http\Response;
use OCP\AppFramework\Http\TemplateResponse;
use OCP\AppFramework\Middleware;
use OCP\IRequest;
class CompressionMiddleware extends Middleware {
/** @var bool */
private $useGZip;
/** @var IRequest */
private $request;
public function __construct(IRequest $request) {
$this->request = $request;
$this->useGZip = false;
}
public function afterController($controller, $methodName, Response $response) {
// By default we do not gzip
$allowGzip = false;
// Only return gzipped content for 200 responses
if ($response->getStatus() !== Http::STATUS_OK) {
return $response;
}
// Check if we are even asked for gzip
$header = $this->request->getHeader('Accept-Encoding');
if (!str_contains($header, 'gzip')) {
return $response;
}
// We only allow gzip in some cases
if ($response instanceof BaseResponse) {
$allowGzip = true;
}
if ($response instanceof JSONResponse) {
$allowGzip = true;
}
if ($response instanceof TemplateResponse) {
$allowGzip = true;
}
if ($allowGzip) {
$this->useGZip = true;
$response->addHeader('Content-Encoding', 'gzip');
}
return $response;
}
public function beforeOutput($controller, $methodName, $output) {
if (!$this->useGZip) {
return $output;
}
return gzencode($output);
}
}
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