Change the request of cakephp 3 using middleware

I am trying to implement a middleware who will read data from an API and will use it later on the controller. How can do this ? I have made a simple middleware where i have

public function __invoke(ServerRequestInterface $request, ResponseInterface $response, $next)
{
    $dataFromApi = curl_action....
    $request->dataFromApi = $dataFromApi;
    return next($request, $response);
}

Later on the controller i want to have access to these data by using

public function display(...$path)
{
    $this->set('dataFromApi', $this->request->dataFromAPI);
}

Solution

Look at the \Psr\Http\Message\ServerRequestInterface API, you can store your custom data in an attribute using ServerRequestInterface::withAttribute():

// ...
// request objects are immutable
$request = $request->withAttribute('dataFromApi', $dataFromApi);
// ...
return next($request, $response);

and read in your controller accordingly via ServerRequestInterface::getAttribute():

$this->set('dataFromApi', $this->request->getAttribute('dataFromApi'));