File Server/Transport/Http/MiddlewarePipeline.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* This file is part of the Nexus MCP SDK package.
7:	*
8:	* (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com>
9:	*
10:	* For the full copyright and license information, please view
11:	* the LICENSE file that was distributed with this source code.
12:	*/
13:
14:	namespace Nexus\Mcp\Server\Transport\Http;
15:
16:	use Psr\Http\Message\ResponseInterface;
17:	use Psr\Http\Message\ServerRequestInterface;
18:	use Psr\Http\Server\MiddlewareInterface;
19:	use Psr\Http\Server\RequestHandlerInterface;
20:
21:	/**
22:	* Composes PSR-15 middleware outermost-first in front of an inner request handler.
23:	*/
24:	final readonly class MiddlewarePipeline implements RequestHandlerInterface
25:	{
26:	/**
27:	* @var list<MiddlewareInterface>
28:	*/
29:	private array $middleware;
30:
31:	public function __construct(
32:	private RequestHandlerInterface $handler,
33:	MiddlewareInterface ...$middleware,
34:	) {
35:	$this->middleware = array_values($middleware);
36:	}
37:
38:	#[\Override]
39:	public function handle(ServerRequestInterface $request): ResponseInterface
40:	{
41:	if ([] === $this->middleware) {
42:	return $this->handler->handle($request);
43:	}
44:
45:	return $this->middleware[0]->process(
46:	$request,
47:	new self($this->handler, ...\array_slice($this->middleware, 1)),
48:	);
49:	}
50:	}
51: