MiddlewareDispatcher.php

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<?php
declare(strict_types = 1);
namespace ‪TYPO3\CMS\Core\Http;
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
class ‪MiddlewareDispatcher implements ‪RequestHandlerInterface
{
    protected ‪$tip;
 
    public function ‪__construct(
        ‪RequestHandlerInterface $kernel,
        array $middlewares = []
    ) {
        $this->‪seedMiddlewareStack($kernel);
 
        foreach ($middlewares as $middleware) {
            if (is_string($middleware)) {
                $this->‪lazy($middleware);
            } else {
                $this->‪add($middleware);
            }
        }
    }
 
    public function ‪handle(ServerRequestInterface $request): ResponseInterface
    {
        return $this->tip->handle($request);
    }
 
    protected function ‪seedMiddlewareStack(‪RequestHandlerInterface $kernel)
    {
        $this->tip = $kernel;
    }
 
    public function ‪add(MiddlewareInterface $middleware)
    {
        $next = ‪$this->tip;
        $this->tip = new class($middleware, $next) implements ‪RequestHandlerInterface {
            private $middleware;
            private $next;
 
            public function ‪__construct(MiddlewareInterface $middleware, ‪RequestHandlerInterface $next)
            {
                $this->middleware = $middleware;
                $this->next = $next;
            }
 
            public function ‪handle(ServerRequestInterface $request): ResponseInterface
            {
                return $this->middleware->process($request, $this->next);
            }
        };
    }
 
    public function ‪lazy(string $middleware)
    {
        $next = ‪$this->tip;
        $this->tip = new class($middleware, $next) implements ‪RequestHandlerInterface {
            private $middleware;
            private $next;
 
            public function ‪__construct(string $middleware, ‪RequestHandlerInterface $next)
            {
                $this->middleware = $middleware;
                $this->next = $next;
            }
 
            public function ‪handle(ServerRequestInterface $request): ResponseInterface
            {
                $middleware = GeneralUtility::makeInstance($this->middleware);
 
                if (!$middleware instanceof MiddlewareInterface) {
                    throw new \InvalidArgumentException(get_class($middleware) . ' does not implement ' . MiddlewareInterface::class, 1516821342);
                }
                return $middleware->process($request, $this->next);
            }
        };
    }
}