/**
* Add rel=schema Link header for most routes
*
* This does not add a link to routes used by the schema bundle
* itself.
*
* @param FilterResponseEvent $event response event
*
* @return void
*/
public function onKernelResponse(FilterResponseEvent $event)
{
$request = $event->getRequest();
$response = $event->getResponse();
$type = $response->headers->get('Content-Type');
if ($type !== null && substr(strtolower($type), 0, 16) !== 'application/json') {
return;
}
// build content-type string
$contentType = 'application/json; charset=UTF-8';
if ($request->get('_route') != 'graviton.core.static.main.all') {
try {
$schemaRoute = SchemaUtils::getSchemaRouteName($request->get('_route'));
$contentType .= sprintf('; profile=%s', $this->router->generate($schemaRoute, array(), true));
} catch (\Exception $e) {
return true;
}
}
// replace content-type if a schema was requested
if ($request->attributes->get('schemaRequest')) {
$contentType = 'application/schema+json';
}
$response->headers->set('Content-Type', $contentType);
$event->setResponse($response);
}
/**
* add a rel=self Link header to the response
*
* @param FilterResponseEvent $event response listener event
*
* @return void
*/
public function onKernelResponse(FilterResponseEvent $event)
{
$request = $event->getRequest();
if ($request->attributes->get('schemaRequest', false)) {
$response = $event->getResponse();
$linkHeader = LinkHeader::fromResponse($response);
$routeName = SchemaUtils::getSchemaRouteName($request->get('_route'));
$url = $this->router->generate($routeName, array(), true);
// append rel=canonical link to link headers
$linkHeader->add(new LinkHeaderItem($url, array('rel' => 'canonical')));
// overwrite link headers with new headers
$response->headers->set('Link', (string) $linkHeader);
$event->setResponse($response);
}
}
