index.php

<?php

$app->add(function ($request, $response, $next) {
  $detectedIp = $request->getAttribute('ip_address', null);
  $trustedIps = ['1.1.1.1', '2.2.2.2'];
  
  if (!$detectedIp || !in_array($detectedIp, $trustedIps)) {
    return $response->withJson(['error' => 'Unauthorized ip address', 401]); 
  }
  
  return $next($request, $response;
});

$checkProxyHeaders = true; // Note: Never trust the IP address for security processes!
$trustedProxies = ['10.0.0.1', '10.0.0.2']; // Note: Never trust the IP address for security processes!
$app->add(new RKA\Middleware\IpAddress($checkProxyHeaders, $trustedProxies));