1: <?php
 2: /**
 3:  * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 4:  * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 5:  *
 6:  * Licensed under The MIT License
 7:  * For full copyright and license information, please see the LICENSE.txt
 8:  * Redistributions of files must retain the above copyright notice.
 9:  *
10:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
11:  * @link          https://cakephp.org CakePHP(tm) Project
12:  * @since         3.3.0
13:  * @license       https://opensource.org/licenses/mit-license.php MIT License
14:  */
15: namespace Cake\Http;
16: 
17: use Psr\Http\Message\ResponseInterface;
18: use Psr\Http\Message\ServerRequestInterface;
19: 
20: /**
21:  * Executes the middleware queue and provides the `next` callable
22:  * that allows the queue to be iterated.
23:  */
24: class Runner
25: {
26:     /**
27:      * The current index in the middleware queue.
28:      *
29:      * @var int
30:      */
31:     protected $index;
32: 
33:     /**
34:      * The middleware queue being run.
35:      *
36:      * @var \Cake\Http\MiddlewareQueue
37:      */
38:     protected $middleware;
39: 
40:     /**
41:      * @param \Cake\Http\MiddlewareQueue $middleware The middleware queue
42:      * @param \Psr\Http\Message\ServerRequestInterface $request The Server Request
43:      * @param \Psr\Http\Message\ResponseInterface $response The response
44:      * @return \Psr\Http\Message\ResponseInterface A response object
45:      */
46:     public function run($middleware, ServerRequestInterface $request, ResponseInterface $response)
47:     {
48:         $this->middleware = $middleware;
49:         $this->index = 0;
50: 
51:         return $this->__invoke($request, $response);
52:     }
53: 
54:     /**
55:      * @param \Psr\Http\Message\ServerRequestInterface $request The server request
56:      * @param \Psr\Http\Message\ResponseInterface $response The response object
57:      * @return \Psr\Http\Message\ResponseInterface An updated response
58:      */
59:     public function __invoke(ServerRequestInterface $request, ResponseInterface $response)
60:     {
61:         $next = $this->middleware->get($this->index);
62:         if ($next) {
63:             $this->index++;
64: 
65:             return $next($request, $response, $this);
66:         }
67: 
68:         // End of the queue
69:         return $response;
70:     }
71: }
72: