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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\ServerRequestInterface; |
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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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use Exception; |
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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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/** |
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* @var array Available sizes |
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*/ |
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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 __construct(array $sizes) |
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{ |
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$this->sizes = $sizes; |
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return $this; |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $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(ServerRequestInterface $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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//If it's not an image or basePath does not match or invalid transform values, don't do anything |
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if (!in_array(FormatNegotiator::getFormat($request), ['jpg', 'jpeg', 'gif', 'png']) || !$this->testBasePath($request->getUri()->getPath()) || !($info = $this->parsePath($request->getUri()->getPath()))) { |
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return $next($request, $response); |
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} |
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list($path, $transform) = $info; |
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$uri = $request->getUri()->withPath($path); |
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$request = $request->withUri($uri); |
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$response = $next($request, $response); |
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//Check the response and transform the image |
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if ($transform && $response->getStatusCode() === 200 && $response->getBody()->getSize()) { |
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return $this->transform($response, $transform); |
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} |
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return $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 ResponseInterface $response |
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* @param string $transform |
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* |
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* @return ResponseInterface |
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*/ |
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private function transform(ResponseInterface $response, $transform) |
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{ |
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$image = Image::createFromString((string) $response->getBody()); |
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$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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* For example, the path "/images/small.avatar.jpg" returns: |
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* ["/images/avatar.jpg", "resizeCrop,50,50"]. |
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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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$info = pathinfo($path); |
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try { |
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$pieces = explode('.', $info['filename'], 2); |
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} catch (Exception $e) { |
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return; |
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} |
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if (count($pieces) === 2) { |
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list($transform, $file) = $pieces; |
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//Check if the size is valid |
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if (!isset($this->sizes[$transform])) { |
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return; |
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} |
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return [Utils\Helpers::joinPath($info['dirname'], "{$file}.".$info['extension']), $this->sizes[$transform]]; |
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} |
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} |
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} |
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oscarotero /
psr7-middlewares
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Adding a
@returnannotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.