I found myself wanting to check if a given URL path exists on another host of a multi-host Symfony application from within a controller action. The router service, which is the instance of Symfony’s routing component used to route requests to actions, has a match() method, but it only accepts the path part of the URL. It also has a matchRequest() method, but that seems to ignore the HTTP_HOST and SERVER_NAME of the passed Request object.
I discovered that the router, during a request, has a RequestContext object, from which it gets the host value for matching routes. The router’s context is gettable and the context’s host is settable, so it’s just a matter of changing the host, then doing the match():
//β¦
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
class Controller{
public action(){
$router = $this->get('router');
$routerContext = $router->getContext();
$requestHost = $routerContext->getHost();
try{
$routerContext->setHost('other-domain.com');
$router->match('/foo');
$haveMatch = true;
}catch(ResourceNotFoundException $e){
$haveMatch = false;
}
$routerContext->setHost($requestHost);
//β¦
}
}
The $haveMatch boolean can then be used for whatever logic I want. I am setting the host back to what it was just in case, though it didn’t seem to cause any problems when I didn’t.