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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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use Psr7Middlewares\Middleware; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Imagecow\Image; |
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use RuntimeException; |
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/** |
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* Middleware to manipulate images on demand. |
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*/ |
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class ImageTransformer |
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{ |
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use Utils\BasePathTrait; |
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use Utils\StorageTrait; |
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protected $sizes; |
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/** |
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* Define the available sizes, for example: |
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* [ |
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* 'small' => 'resizeCrop,50,50', |
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* 'medium' => 'resize,500', |
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* 'big' => 'resize,1000', |
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* ]. |
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* |
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* @param array $sizes |
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* |
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* @return self |
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*/ |
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public function sizes(array $sizes) |
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{ |
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$this->sizes = $sizes; |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(RequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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if (!Middleware::hasAttribute($request, FormatNegotiator::KEY)) { |
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throw new RuntimeException('ResponsiveImage middleware needs FormatNegotiator executed before'); |
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} |
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//Is not a valid image? |
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if (!in_array(FormatNegotiator::getFormat($request), ['jpg', 'jpeg', 'gif', 'png'])) { |
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return $next($request, $response); |
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} |
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//Get the file |
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$info = $this->parsePath($request->getUri()->getPath()); |
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if ($info) { |
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list($file, $transform) = $info; |
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return $this->transform($file, $transform, $response); |
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} |
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return $next($request, $response); |
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} |
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/** |
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* Transform the image. |
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* |
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* @param string $file |
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* @param string $transform |
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* @param ResponseInterface $response |
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* |
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* @return ResponseInterface |
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*/ |
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private function transform($file, $transform, ResponseInterface $response) |
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{ |
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//Check if the file exists |
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if (!is_file($file)) { |
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return $response->withStatus(404); |
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} |
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//Check if the size is valid |
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if (is_array($this->sizes)) { |
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if (!isset($this->sizes[$transform])) { |
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return $response->withStatus(404); |
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} |
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$transform = $this->sizes[$transform]; |
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} |
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$image = Image::create($file); |
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$image->transform($transform); |
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$body = Middleware::createStream(); |
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$body->write($image->getString()); |
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return $response |
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->withBody($body) |
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->withHeader('Content-Type', $image->getMimeType()); |
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} |
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/** |
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* Parses the path and return the file and transform values. |
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* |
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* @param string $path |
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* |
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* @return null|array [file, transform] |
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*/ |
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private function parsePath($path) |
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{ |
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$path = $this->getBasePath($path); |
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$info = pathinfo($path); |
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$pieces = explode('.', $info['filename'], 2); |
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if (count($pieces) === 2) { |
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list($transform, $file) = $pieces; |
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return [Utils\Path::join($this->storage, $info['dirname'], "{$file}.".$info['extension']), $transform]; |
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} |
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} |
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} |
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oscarotero /
psr7-middlewares
Loading history...
This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass.
Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type.