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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of fast-forward/defer. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @copyright Copyright (c) 2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 12 | * @license https://opensource.org/licenses/MIT MIT License |
| 13 | * |
| 14 | * @see https://github.com/php-fast-forward/defer |
| 15 | * @see https://github.com/php-fast-forward |
| 16 | * @see https://datatracker.ietf.org/doc/html/rfc2119 |
| 17 | */ |
| 18 | |
| 19 | namespace FastForward\Defer\Middleware; |
| 20 | |
| 21 | use LogicException; |
| 22 | use FastForward\Defer\Defer; |
| 23 | use FastForward\Defer\DeferInterface; |
| 24 | use Psr\Http\Message\ResponseInterface; |
| 25 | use Psr\Http\Message\ServerRequestInterface; |
| 26 | use Psr\Http\Server\MiddlewareInterface; |
| 27 | use Psr\Http\Server\RequestHandlerInterface; |
| 28 | |
| 29 | /** |
| 30 | * This middleware MUST be used to inject and manage a Defer instance in a PSR-15 ServerRequest. |
| 31 | * It SHALL ensure that all deferred callbacks are executed at the end of the request lifecycle. |
| 32 | * The attribute name MAY be customized via the constructor. |
| 33 | */ |
| 34 | final readonly class DeferMiddleware implements MiddlewareInterface |
| 35 | { |
| 36 | /** |
| 37 | * Constructs a new DeferMiddleware instance. |
| 38 | * |
| 39 | * @param string $attribute the attribute name to use for storing the Defer instance (optional) |
| 40 | */ |
| 41 | public function __construct( |
| 42 | private string $attribute = DeferInterface::class, |
| 43 | ) {} |
| 44 | |
| 45 | /** |
| 46 | * Returns the attribute name used to store the Defer instance. |
| 47 | * |
| 48 | * @return string the attribute name |
| 49 | */ |
| 50 | public function getAttribute(): string |
| 51 | { |
| 52 | return $this->attribute; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Retrieves the Defer instance from the request. |
| 57 | * |
| 58 | * This method MUST throw a LogicException if the Defer instance is not found. |
| 59 | * |
| 60 | * @param ServerRequestInterface $request the request to retrieve the Defer instance from |
| 61 | * |
| 62 | * @return DeferInterface the Defer instance |
| 63 | * |
| 64 | * @throws LogicException |
| 65 | */ |
| 66 | public function getDefer(ServerRequestInterface $request): DeferInterface |
| 67 | { |
| 68 | $defer = $request->getAttribute($this->attribute); |
| 69 | |
| 70 | if (! $defer instanceof DeferInterface) { |
| 71 | throw new LogicException(\sprintf('Defer instance not found in request attribute "%s".', $this->attribute)); |
| 72 | } |
| 73 | |
| 74 | return $defer; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Processes the request, injecting the Defer instance and ensuring execution at the end. |
| 79 | * |
| 80 | * @param ServerRequestInterface $request the incoming request |
| 81 | * @param RequestHandlerInterface $handler the request handler |
| 82 | * |
| 83 | * @return ResponseInterface the response from the handler |
| 84 | */ |
| 85 | public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
| 86 | { |
| 87 | $defer = new Defer(); |
| 88 | |
| 89 | $request = $request->withAttribute($this->attribute, $defer); |
| 90 | |
| 91 | try { |
| 92 | return $handler->handle($request); |
| 93 | } finally { |
| 94 | unset($defer); |
| 95 | } |
| 96 | } |
| 97 | } |