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<?php
namespace Drupal\Core\Form;
use Symfony\Component\HttpFoundation\Response;
/**
* A wrapper containing a response which is to be enforced upon delivery.
*
* The FormBuilder throws an EnforcedResponseException whenever a form
* desires to explicitly set a response object. Exception handlers capable of
* setting the response should extract the response object of such an exception
* using EnforcedResponse::createFromException(). Then wrap it into an
* EnforcedResponse object and replace the original response with the wrapped
* response.
*
* @see Drupal\Core\EventSubscriber\EnforcedFormResponseSubscriber::onKernelException()
* @see Drupal\Core\EventSubscriber\DefaultExceptionSubscriber::createHtmlResponse()
* @see Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber::createResponse()
*/
class EnforcedResponse extends Response {
/**
* The wrapped response object.
*
* @var \Symfony\Component\HttpFoundation\Response;
*/
protected $response;
/**
* Constructs a new enforced response from the given exception.
*
* Note that it is necessary to traverse the exception chain when searching
* for an enforced response. Otherwise it would be impossible to find an
* exception thrown from within a twig template.
*
* @param \Exception $e
* The exception where the enforced response is to be extracted from.
*
* @return \Drupal\Core\Form\EnforcedResponse|null
* The enforced response or NULL if the exception chain does not contain a
* \Drupal\Core\Form\EnforcedResponseException exception.
*/
public static function createFromException(\Exception $e) {
while ($e) {
if ($e instanceof EnforcedResponseException) {
return new static($e->getResponse());
}
$e = $e->getPrevious();
}
}
/**
* Constructs an enforced response.
*
* Use EnforcedResponse::createFromException() instead.
*
* @param \Symfony\Component\HttpFoundation\Response $response
* The response to wrap.
*/
public function __construct(Response $response) {
parent::__construct('', 500);
$this->response = $response;
}
/**
* Returns the wrapped response.
*
* @return \Symfony\Component\HttpFoundation\Response
* The wrapped response.
*/
public function getResponse() {
return $this->response;
}
}