Using entomb/slim-json-api with other middleware - php

Question

I am relatively new to PHP, which might well prove to be the main problem here - I get the feeling I'm missing something somewhat fundamental about PHP internals that would either make solving this straightforward, or make it glaringly obvious why I am wasting my time!...
Basically in the following Slim API code I would like the exception handling added by the excellent entomb/slim-json-api middleware to also apply to the subsequent myMiddleware. As implemented below, it only seems to handle failures generated in the route code...
(PHP v 5.4.17)
$ php composer.phar info
entomb/slim-json-api dev-master c11e001 Slim extension to implement fast JSON API's
slim/slim 2.6.2 Slim Framework, a PHP micro framework
API code:
require 'vendor/autoload.php';
use Slim\Middleware;
class myMiddleware extends Middleware
{
public function call()
{
$uri_array = explode('/', $this->app->request->getResourceUri());
$env = $this->app->environment;
if($uri_array[2] == 98) {
throw new \Exception("User $uri_array[2], you are not even welcome in middleware!");
} else {
$body = array('user_from_middleware' => $uri_array[2]);
$env['slim.input'] = json_encode($body);
}
$this->next->call();
}
}
///////////////////////////////////////////////////////////////////////////////////
$app = new \Slim\Slim();
$app->view(new \JsonApiView());
$app->add(new \JsonApiMiddleware());
$app->add(new myMiddleware());
$app->get('/user/:id', function($id) use ($app) {
if ($id == 99) {
throw new \Exception("User $id, you are not welcome!");
} else {
$body = json_decode($app->request->getBody());
$body->msg = "User $id welcome to my API!";
$app->render(200,(array) $body);
}
});
Here's a request that misses both Exceptions:
$ curl http://localhost:8082/test.php/user/1
{"user_from_middleware":"1","msg":"User 1 welcome to my API!","error":false,"status":200}
...this one fires the Exception in route, showing that the JsonApiMiddleware is working:
$ curl http://localhost:8082/test.php/user/99
{"msg":"ERROR: User 99, you are not welcome!","error":true,"status":500}
...but when this one fires the Exception in myMiddleware the API returns nothing:
$ curl http://localhost:8082/test.php/user/98
$
...and I can see from the log that the exception was definitely thrown:
[Mon Nov 7 21:54:08 2016] PHP Fatal error: Uncaught exception 'Exception' with message 'User 98, you are not even welcome in middleware!' in /path/to/test.php:14
Stack trace:
#0 /path/to/vendor/slim/slim/Slim/Slim.php(1302): myMiddleware->call()
#1 /path/to/test.php(42): Slim\Slim->run()
#2 {main}
thrown in /path/to/test.php on line 14
What am I missing? Apologies again if this is a tedious question.

Answer 1

Probably you should not $this->next->call() in MyMiddlware if an exception is thrown?..
class myMiddleware extends Middleware
{
public function call()
{
$uri_array = explode('/', $this->app->request->getResourceUri());
$env = $this->app->environment;
if($uri_array[2] == 98) {
throw new \Exception("User $uri_array[2], you are not even welcome in middleware!");
} else {
$body = array('user_from_middleware' => $uri_array[2]);
$env['slim.input'] = json_encode($body);
$this->next->call(); // call next callable only if exception was not thrown
}
}
}
Seems like you're using Slim v 2., but this is what I'd do in Slim 3.5.*