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<?php |
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namespace Philae\Middlewares; |
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use Interop\Http\ServerMiddleware\DelegateInterface; |
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use Middlewares\Utils; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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/** |
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* Wraps the request handler callback in another one that will |
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* try to convert the request handler result into a PSR-7 Response |
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* and/or apply some changes to the response object itself |
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* (like setting/fixing the Content Length header). |
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*/ |
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class ResponseTransformer extends AbstractMiddleware |
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{ |
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/** |
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* @var string Attribute name for handler reference |
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*/ |
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protected $handlerAttribute = 'request-handler'; |
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/** |
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* Set the attribute name to store handler reference. |
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* |
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* @param string $handlerAttribute |
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* |
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* @return self |
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*/ |
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public function handlerAttribute(string $handlerAttribute) |
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{ |
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$this->handlerAttribute = $handlerAttribute; |
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return $this; |
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} |
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/** |
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* Process a server request and return a response. |
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* |
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* @param ServerRequestInterface $request |
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* @param DelegateInterface $delegate |
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* |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, DelegateInterface $delegate) |
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{ |
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$handler = $request->getAttribute($this->handlerAttribute); |
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if (!is_callable($handler)) { |
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return $delegate->process($request); |
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} |
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$handlerWrapper = function (...$args) use ($handler) { |
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$result = call_user_func($handler, ...$args); |
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$response = $this->transform($result); |
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if (!($response instanceof ResponseInterface)) { |
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$type = is_object($response) ? get_class($response) : gettype($response); |
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throw new \UnexpectedValueException( |
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'Cannot convert the request handler result of type `' . $type . '` into a Response object.' |
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); |
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} |
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return $response; |
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}; |
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$request = $request->withAttribute($this->handlerAttribute, $handlerWrapper); |
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return $delegate->process($request); |
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} |
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/** |
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* Tries to transform the given result into a Response object, otherwise it is returned back. |
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* @param mixed $result |
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* @return ResponseInterface|mixed |
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*/ |
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public function transform($result) |
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{ |
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if ($result instanceof ResponseInterface) { |
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return $result->withHeader('Content-Length', $result->getBody()->getSize()); |
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} |
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if (is_scalar($result) || is_null($result)) { |
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$result = strval($result); |
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} elseif (is_object($result) && method_exists($result, '__toString')) { |
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$result = $result->__toString(); |
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} |
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if (!is_string($result)) { |
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return $result; |
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} |
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$response = Utils\Factory::createResponse((strlen($result) > 0) ? 200 : 204); |
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$response->getBody()->write($result); |
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return $response; |
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} |
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} |
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itsjavi /
philae
