How to handle correctly JSON request in symfony? - php

Question

I'm trying to handle this problem:
My app send JSON POST request with several information encoded in a Json. Example:
{"UserInfoA":{"1":123,"2":"hello","3":"bye","4":{"subinfo":1,"subinfo2":10}},
"UserInfoB":{"a":"12345678","b":"asd"}} // and so on...
each UserInfo have:
Its own entity (although some request may have information of more than one entity).
A controller to persist this Object on DB and then give back the ID on this DB.
So, to achieve this problem I did another controller like JsonHandler, which receive this request and then forward to each controller after gut this JSON into differents objects. Example:
public function getJson (Request $request){
if (0 === strpos($request->headers->get('Content-Type'), 'application/json')) {
$data = json_decode($request->getContent(), true);
}
if (!isset($data['UserInfoA'])){
return new JsonResponse('ERROR');
}
$uia = $data['UserInfoA'];
$idInfoA = $this->forward('Path::dataAPersist',array('data'=>$uia));
}
// same with userinfoB and other objects
return $idInfoA ;
This works perfectly but Is it correct? Should i use services instead?
EDIT : I need to response the ID in a Json and this->forward returns a Response, so i can't use JsonResponse and if a send directly $idInfoA just send the IDNUMBER not in a JSON, how can i do it?
To sum up : a Json listener that receive the information, work it and then dispatch to the corresponding controller. This listener, should be a controller, a service or another thing?

Answer 1

I recommend the use of symfony-bundles/json-request-bundle since it does the JsonRequestTransformerListener for you. You just need to recieve the request parameters as usual:
...
$request->get('some_parameter');
...

Answer 2

hi you have to use service to make the Transformation
class php
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
class JsonRequestTransformerListener {
public function onKernelRequest(GetResponseEvent $event) {
$request = $event->getRequest();
$content = $request->getContent();
if (empty($content)) {
return;
}
if (!$this->isJsonRequest($request)) {
return;
}
if (!$this->transformJsonBody($request)) {
$response = Response::create('Unable to parse request.', 400);
$event->setResponse($response);
}
}
private function isJsonRequest(Request $request) {
return 'json' === $request->getContentType();
}
private function transformJsonBody(Request $request) {
$data = json_decode($request->getContent(), true);
if (json_last_error() !== JSON_ERROR_NONE) {
return false;
}
if ($data === null) {
return true;
}
$request->request->replace($data);
return true;
}
}
And In Your Service.yml
kernel.event_listener.json_request_transformer:
class: You\NameBundle\Service\JsonRequestTransformerListener
tags:
- { name: "kernel.event_listener", event: "kernel.request",method: "onKernelRequest", priority: "100" }
Now You can call The Default request function to get Data
$request->request->all();

Answer 3

You can use symfony ParamConverter to to convert the json into any object you want and raise a meaningful Exception if anything goes wrong.
You can add custom ParamConverters and use them in your actions with annotation