向PHP Slim 3响应添加状态

Question

I have a piece of middleware in Slim 3 that validates a session for each route. If validation fails, it returns a JSON object with { 'status' : false, 'error': 'failed validation' } . If validation passes, it adds 'status' : true to the response JSON object.

How do I insert an object property into the $response?

$app->add(function($request, $response, $next) {
    $valid = doExternalValidation();
    if ($valid == false) {
        return $response->withJSON(
            [ 'status' => false, 'errors' => 'failed validation' ]
        );
    }
    $response = $next($request, $response);
    $response->jsonBody['status'] = true;  // THIS IS WHAT I WANT TO DO
    return $response;
});

$app->get('/test', function ($request, $response, $args) {
    $data = [ "foo" => "bar" ];
    return $response->withJSON([ 'data' => $data ]);
});

How can I alter the middleware function so that I get { "status" : true, "data" : { "foo" : "bar" } } ?

Answer 1

Solution:

1) Rewind the Body, as on the back-side of the middleware the cursor of the body is at the end of the stream

2) Decode the Body (rewind resets the cursor to the head of the message)

3) Mutate the Entity

4) Re-insert the Entity with withJson

5) Return the new Json Response

Sample code:

$app->add(function($request, $response, $next) {
    $valid = doExternalValidation();
    if ($valid == false) {
        return $response->withJSON(
            [ 'status' => false, 'errors' => 'failed validation' ]
        );
    }
    $response = $next($request, $response);

    $response->getBody()->rewind();
    $object = json_decode($response->getBody());
    $object['status'] = true;
    return $response->withJson($object);
});