--- /dev/null
+<?php
+
+namespace Drupal\image\Controller;
+
+use Drupal\Component\Utility\Crypt;
+use Drupal\Core\Image\ImageFactory;
+use Drupal\Core\Lock\LockBackendInterface;
+use Drupal\image\ImageStyleInterface;
+use Drupal\system\FileDownloadController;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
+
+/**
+ * Defines a controller to serve image styles.
+ */
+class ImageStyleDownloadController extends FileDownloadController {
+
+ /**
+ * The lock backend.
+ *
+ * @var \Drupal\Core\Lock\LockBackendInterface
+ */
+ protected $lock;
+
+ /**
+ * The image factory.
+ *
+ * @var \Drupal\Core\Image\ImageFactory
+ */
+ protected $imageFactory;
+
+ /**
+ * A logger instance.
+ *
+ * @var \Psr\Log\LoggerInterface
+ */
+ protected $logger;
+
+ /**
+ * Constructs a ImageStyleDownloadController object.
+ *
+ * @param \Drupal\Core\Lock\LockBackendInterface $lock
+ * The lock backend.
+ * @param \Drupal\Core\Image\ImageFactory $image_factory
+ * The image factory.
+ */
+ public function __construct(LockBackendInterface $lock, ImageFactory $image_factory) {
+ $this->lock = $lock;
+ $this->imageFactory = $image_factory;
+ $this->logger = $this->getLogger('image');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('lock'),
+ $container->get('image.factory')
+ );
+ }
+
+ /**
+ * Generates a derivative, given a style and image path.
+ *
+ * After generating an image, transfer it to the requesting agent.
+ *
+ * @param \Symfony\Component\HttpFoundation\Request $request
+ * The request object.
+ * @param string $scheme
+ * The file scheme, defaults to 'private'.
+ * @param \Drupal\image\ImageStyleInterface $image_style
+ * The image style to deliver.
+ *
+ * @return \Symfony\Component\HttpFoundation\BinaryFileResponse|\Symfony\Component\HttpFoundation\Response
+ * The transferred file as response or some error response.
+ *
+ * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
+ * Thrown when the user does not have access to the file.
+ * @throws \Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException
+ * Thrown when the file is still being generated.
+ */
+ public function deliver(Request $request, $scheme, ImageStyleInterface $image_style) {
+ $target = $request->query->get('file');
+ $image_uri = $scheme . '://' . $target;
+
+ // Check that the style is defined, the scheme is valid, and the image
+ // derivative token is valid. Sites which require image derivatives to be
+ // generated without a token can set the
+ // 'image.settings:allow_insecure_derivatives' configuration to TRUE to
+ // bypass the latter check, but this will increase the site's vulnerability
+ // to denial-of-service attacks. To prevent this variable from leaving the
+ // site vulnerable to the most serious attacks, a token is always required
+ // when a derivative of a style is requested.
+ // The $target variable for a derivative of a style has
+ // styles/<style_name>/... as structure, so we check if the $target variable
+ // starts with styles/.
+ $valid = !empty($image_style) && file_stream_wrapper_valid_scheme($scheme);
+ if (!$this->config('image.settings')->get('allow_insecure_derivatives') || strpos(ltrim($target, '\/'), 'styles/') === 0) {
+ $valid &= $request->query->get(IMAGE_DERIVATIVE_TOKEN) === $image_style->getPathToken($image_uri);
+ }
+ if (!$valid) {
+ throw new AccessDeniedHttpException();
+ }
+
+ $derivative_uri = $image_style->buildUri($image_uri);
+ $headers = [];
+
+ // If using the private scheme, let other modules provide headers and
+ // control access to the file.
+ if ($scheme == 'private') {
+ $headers = $this->moduleHandler()->invokeAll('file_download', [$image_uri]);
+ if (in_array(-1, $headers) || empty($headers)) {
+ throw new AccessDeniedHttpException();
+ }
+ }
+
+ // Don't try to generate file if source is missing.
+ if (!file_exists($image_uri)) {
+ // If the image style converted the extension, it has been added to the
+ // original file, resulting in filenames like image.png.jpeg. So to find
+ // the actual source image, we remove the extension and check if that
+ // image exists.
+ $path_info = pathinfo($image_uri);
+ $converted_image_uri = $path_info['dirname'] . DIRECTORY_SEPARATOR . $path_info['filename'];
+ if (!file_exists($converted_image_uri)) {
+ $this->logger->notice('Source image at %source_image_path not found while trying to generate derivative image at %derivative_path.', ['%source_image_path' => $image_uri, '%derivative_path' => $derivative_uri]);
+ return new Response($this->t('Error generating image, missing source file.'), 404);
+ }
+ else {
+ // The converted file does exist, use it as the source.
+ $image_uri = $converted_image_uri;
+ }
+ }
+
+ // Don't start generating the image if the derivative already exists or if
+ // generation is in progress in another thread.
+ if (!file_exists($derivative_uri)) {
+ $lock_name = 'image_style_deliver:' . $image_style->id() . ':' . Crypt::hashBase64($image_uri);
+ $lock_acquired = $this->lock->acquire($lock_name);
+ if (!$lock_acquired) {
+ // Tell client to retry again in 3 seconds. Currently no browsers are
+ // known to support Retry-After.
+ throw new ServiceUnavailableHttpException(3, $this->t('Image generation in progress. Try again shortly.'));
+ }
+ }
+
+ // Try to generate the image, unless another thread just did it while we
+ // were acquiring the lock.
+ $success = file_exists($derivative_uri) || $image_style->createDerivative($image_uri, $derivative_uri);
+
+ if (!empty($lock_acquired)) {
+ $this->lock->release($lock_name);
+ }
+
+ if ($success) {
+ $image = $this->imageFactory->get($derivative_uri);
+ $uri = $image->getSource();
+ $headers += [
+ 'Content-Type' => $image->getMimeType(),
+ 'Content-Length' => $image->getFileSize(),
+ ];
+ // \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');
+ }
+ else {
+ $this->logger->notice('Unable to generate the derived image located at %path.', ['%path' => $derivative_uri]);
+ return new Response($this->t('Error generating image.'), 500);
+ }
+ }
+
+}
projects / yaffs-website / blobdiff