Imbo\EventListener\Cors::options PHP Method

    public function options(EventInterface $event)
    {
        $request = $event->getRequest();
        $response = $event->getResponse();
        $origin = $request->headers->get('Origin');
        // This is an OPTIONS request, send 204 since no more content will follow
        $response->setStatusCode(204);
        // Vary on Origin to prevent caching allowed/disallowed requests
        $event->getResponse()->setVary('Origin', false);
        // Fall back if the passed origin is not allowed
        if (!$origin || !$this->originIsAllowed($origin)) {
            return;
        }
        $resource = (string) $request->getRoute();
        $allowedMethods = ['OPTIONS'];
        if (isset($this->params['allowedMethods'][$resource])) {
            $allowedMethods = array_merge($allowedMethods, $this->params['allowedMethods'][$resource]);
        }
        $allowedHeaders = ['Content-Type', 'Accept'];
        $requestHeaders = $request->headers->get('Access-Control-Request-Headers', '');
        $requestHeaders = array_map('trim', explode(',', $requestHeaders));
        foreach ($requestHeaders as $header) {
            if (strpos($header, 'x-imbo') === 0) {
                $allowedHeaders[] = implode('-', array_map('ucfirst', explode('-', $header)));
            }
        }
        $response->headers->add(['Access-Control-Allow-Origin' => $origin, 'Access-Control-Allow-Methods' => implode(', ', $allowedMethods), 'Access-Control-Allow-Headers' => implode(', ', $allowedHeaders), 'Access-Control-Max-Age' => (int) $this->params['maxAge']]);
        // Since this is an OPTIONS-request, there is no need for further parsing
        $event->stopPropagation();
    }

 /**
  * @covers Imbo\EventListener\Cors::options
  */
 public function testSetsCorrectResposeHeadersOnOptionsRequestWhenOriginIsAllowed()
 {
     $listener = new Cors(['allowedOrigins' => ['*'], 'allowedMethods' => ['image' => ['HEAD']], 'maxAge' => 60]);
     $route = $this->getMock('Imbo\\Router\\Route');
     $route->expects($this->once())->method('__toString')->will($this->returnValue('image'));
     $this->request->expects($this->once())->method('getRoute')->will($this->returnValue($route));
     $this->request->headers = $this->getMock('Symfony\\Component\\HttpFoundation\\HeaderBag');
     $this->request->headers->expects($this->at(0))->method('get')->with('Origin')->will($this->returnValue('http://imbo-project.org'));
     $this->request->headers->expects($this->at(1))->method('get')->with('Access-Control-Request-Headers', '')->will($this->returnValue('x-imbo-signature,something-else'));
     $headers = $this->getMock('Symfony\\Component\\HttpFoundation\\HeaderBag');
     $headers->expects($this->once())->method('add')->with(['Access-Control-Allow-Origin' => 'http://imbo-project.org', 'Access-Control-Allow-Methods' => 'OPTIONS, HEAD', 'Access-Control-Allow-Headers' => 'Content-Type, Accept, X-Imbo-Signature', 'Access-Control-Max-Age' => 60]);
     $this->response->headers = $headers;
     $this->response->expects($this->once())->method('setStatusCode')->with(204);
     $this->event->expects($this->once())->method('stopPropagation');
     $listener->options($this->event);
 }