PHP: Slim Framework Exception Handling - php

Question

I just finished creating an API application with slim framework, initially, in my code I use a dependency container to handle all exceptions thrown, the code is below.
//Add container to handle all exceptions/errors, fail safe and return json
$container['errorHandler'] = function ($container) {
return function ($request, $response, $exception) use ($container) {
//Format of exception to return
$data = [
'message' => $exception->getMessage()
];
return $container->get('response')->withStatus(500)
->withHeader('Content-Type', 'application/json')
->write(json_encode($data));
};
};
But instead of throwing a 500 Server Error all the time I would like to add other HTTPS reponse code. I wonder if I could get help on how to go about that.
public static function decodeToken($token)
{
$token = trim($token);
//Check to ensure token is not empty or invalid
if ($token === '' || $token === null || empty($token)) {
throw new JWTException('Invalid Token');
}
//Remove Bearer if present
$token = trim(str_replace('Bearer ', '', $token));
//Decode token
$token = JWT::decode($token, getenv('SECRET_KEY'), array('HS256'));
//Ensure JIT is present
if ($token->jit == null || $token->jit == "") {
throw new JWTException('Invalid Token');
}
//Ensure User Id is present
if ($token->data->uid == null || $token->data->uid == "") {
throw new JWTException("Invalid Token");
}
return $token;
}
The problem is even more from functions like the above one, since slim framework decides to handle all exceptions implicitly, I have no access to use try catch to catch any errors

Answer 1

Not that hard, it is simple. Rewrite the code:
container['errorHandler'] = function ($container) {
return function ($request, $response, $exception) use ($container) {
//Format of exception to return
$data = [
'message' => $exception->getMessage()
];
return $container->get('response')->withStatus($response->getStatus())
->withHeader('Content-Type', 'application/json')
->write(json_encode($data));
};
}
So what does this code do? You basically pass a $response as before, and what this code does is that it gets the status code from the $response object and passes it to the withStatus() method.
Slim Documentation for referring to status.

Answer 2

You could use the withJson() method of Slim\Http\Response Object
class CustomExceptionHandler
{
public function __invoke(Request $request, Response $response, Exception $exception)
{
$errors['errors'] = $exception->getMessage();
$errors['responseCode'] = 500;
return $response
->withStatus(500)
->withJson($errors);
}
}
and if you are using dependency injection you could do
$container = $app->getContainer();
//error handler
$container['errorHandler'] = function (Container $c) {
return new CustomExceptionHandler();
};