136 lines
4.1 KiB
PHP
136 lines
4.1 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* This file is part of the TYPO3 CMS project.
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*
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* It is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, either version 2
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* of the License, or any later version.
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*
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* For the full copyright and license information, please read the
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* LICENSE.txt file that was distributed with this source code.
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*
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* The TYPO3 project - inspiring people to share!
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*/
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namespace TYPO3\CMS\Core\Http;
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use Psr\Container\ContainerInterface;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\ServerRequestInterface;
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use Psr\Http\Server\MiddlewareInterface;
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use Psr\Http\Server\RequestHandlerInterface;
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use TYPO3\CMS\Core\Utility\GeneralUtility;
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/**
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* MiddlewareDispatcher
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*
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* This class manages and dispatches a PSR-15 middleware stack.
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*
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* @internal
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*/
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class MiddlewareDispatcher implements RequestHandlerInterface
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{
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/**
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* Tip of the middleware call stack
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*
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* @var RequestHandlerInterface
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*/
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protected $tip;
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/**
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* @var ContainerInterface|null
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*/
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protected $container;
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public function __construct(
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RequestHandlerInterface $kernel,
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iterable $middlewares = [],
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?ContainerInterface $container = null
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) {
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$this->container = $container;
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$this->seedMiddlewareStack($kernel);
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foreach ($middlewares as $middleware) {
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if (is_string($middleware)) {
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$this->lazy($middleware);
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} else {
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$this->add($middleware);
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}
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}
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}
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/**
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* Invoke the middleware stack
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*/
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public function handle(ServerRequestInterface $request): ResponseInterface
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{
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return $this->tip->handle($request);
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}
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/**
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* Seed the middleware stack with the inner request handler
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*/
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protected function seedMiddlewareStack(RequestHandlerInterface $kernel)
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{
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$this->tip = $kernel;
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}
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/**
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* Add a new middleware to the stack
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*
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* Middlewares are organized as a stack. That means middlewares
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* that have been added before will be executed after the newly
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* added one (last in, first out).
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*/
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public function add(MiddlewareInterface $middleware): void
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{
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$next = $this->tip;
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$this->tip = new class ($middleware, $next) implements RequestHandlerInterface {
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public function __construct(private readonly MiddlewareInterface $middleware, private readonly RequestHandlerInterface $next) {}
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public function handle(ServerRequestInterface $request): ResponseInterface
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{
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return $this->middleware->process($request, $this->next);
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}
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};
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}
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/**
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* Add a new middleware by class name
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*
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* Middlewares are organized as a stack. That means middlewares
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* that have been added before will be executed after the newly
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* added one (last in, first out).
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*
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* @param string $middleware
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*/
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public function lazy(string $middleware): void
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{
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$next = $this->tip;
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$this->tip = new class ($middleware, $next, $this->container) implements RequestHandlerInterface {
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public function __construct(
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private readonly string $middleware,
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private readonly RequestHandlerInterface $next,
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private readonly ?ContainerInterface $container = null
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) {}
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public function handle(ServerRequestInterface $request): ResponseInterface
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{
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if ($this->container !== null && $this->container->has($this->middleware)) {
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$middleware = $this->container->get($this->middleware);
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} else {
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$middleware = GeneralUtility::makeInstance($this->middleware);
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}
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if (!$middleware instanceof MiddlewareInterface) {
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throw new \InvalidArgumentException(get_class($middleware) . ' does not implement ' . MiddlewareInterface::class, 1516821342);
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}
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return $middleware->process($request, $this->next);
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}
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};
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}
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}
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