What is the opposite of middleware in Laravel? - php

Question

Middleware in Laravel can be used to add app wide logic (or specific to specific routes or group of routes) before any application/business logic is applied. I want to do the same, but after all the application/business logic is done. What I love about middleware is that it centralizes the place where said logic is applied. Is there a way to do that at the end of the request/response lifecycle?
One option is using transformers, but I don't find it as clean as middleware for some reason (maybe because it's done by a third party?)
sample use case: I want to have a group of endpoints always return values in an alternate currency rather than USD only when such requests are made from a certain type of shoppers from a certain geographical area (which I already know). So I will need to perform business logic, and then right before I send the json response back, I want to "hijack" said response and replace all USD values with another currency of my choosing.
Ideas? (I'm using Laravel 5.5)

Answer 1

You can do it in.... the middleware right after the call for the closure
/**
* #param Request $request
* #param \Closure $next
* #return Response
*/
public function handle(Request $request, \Closure $next)
{
//middleware logic
$response = $next($request); //dont return it
//post application/business logic here
return $response;
}
Edit from #ceejayoz comment:
You can use terminate() method in your middleware class to run code After that the response has been sent to the client with the condition that your web server is using FastCGI.
public function handle(Request $request, \Closure $next)
{
//middleware logic
return $next($request); //dont return it
}
public function terminate($request, $response)
{
//post application/business logic here
//no need for return instruction
}
Edit 2
For transformation of the json output, the best solution would be to use the ResourceCollection.
<?php
namespace App\Http\Resources;
use Illuminate\Http\Resources\Json\ResourceCollection;
class Product extends ResourceCollection
{
/**
* Transform the resource collection into an array.
*
* #param \Illuminate\Http\Request $request
* #return array
*/
public function toArray($request)
{
$multiplier = $isUs?1.2:1;
return [
'price' = $this->price * $multiplier,
];
}
}
In your controller use this class as the response for the controller
public function show($productId)
{
return new \App\Http\Resources\Product(Product::find($productId));
}