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<?php
namespace Drupal\system;
use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpFoundation\BinaryFileResponse;
/**
* System file controller.
*/
class FileDownloadController extends ControllerBase {
/**
* Handles private file transfers.
*
* Call modules that implement hook_file_download() to find out if a file is
* accessible and what headers it should be transferred with. If one or more
* modules returned headers the download will start with the returned headers.
* If a module returns -1 an AccessDeniedHttpException will be thrown. If the
* file exists but no modules responded an AccessDeniedHttpException will be
* thrown. If the file does not exist a NotFoundHttpException will be thrown.
*
* @see hook_file_download()
*
* @param \Symfony\Component\HttpFoundation\Request $request
* The request object.
* @param string $scheme
* The file scheme, defaults to 'private'.
*
* @return \Symfony\Component\HttpFoundation\BinaryFileResponse
* The transferred file as response.
*
* @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
* Thrown when the requested file does not exist.
* @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
* Thrown when the user does not have access to the file.
*/
public function download(Request $request, $scheme = 'private') {
$target = $request->query->get('file');
// Merge remaining path arguments into relative file path.
$uri = $scheme . '://' . $target;
if (file_stream_wrapper_valid_scheme($scheme) && file_exists($uri)) {
// Let other modules provide headers and controls access to the file.
$headers = $this->moduleHandler()->invokeAll('file_download', [$uri]);
foreach ($headers as $result) {
if ($result == -1) {
throw new AccessDeniedHttpException();
}
}
if (count($headers)) {
// \Drupal\Core\EventSubscriber\FinishResponseSubscriber::onRespond()
// sets response as not cacheable if the Cache-Control header is not
// already modified. We pass in FALSE for non-private schemes for the
// $public parameter to make sure we don't change the headers.
return new BinaryFileResponse($uri, 200, $headers, $scheme !== 'private');
}
throw new AccessDeniedHttpException();
}
throw new NotFoundHttpException();
}
}