110 lines
3.4 KiB
PHP
110 lines
3.4 KiB
PHP
<?php
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/**
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* Queue-based PSR-15 HTTP Server Request Handler
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* Copyright (C) 2023 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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declare(strict_types=1);
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namespace OCC\PSR15;
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use Psr\Http\Message\ResponseInterface as Response;
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use Psr\Http\Message\ServerRequestInterface as ServerRequest;
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use Psr\Http\Server\MiddlewareInterface;
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use Psr\Http\Server\RequestHandlerInterface as RequestHandler;
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/**
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* Abstract class implementing \Psr\Http\Server\MiddlewareInterface.
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*
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* @author Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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* @package PSR15
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*/
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abstract class AbstractMiddleware implements MiddlewareInterface
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{
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/**
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* The PSR-15 Server Request Handler.
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*
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* @var QueueRequestHandler
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*
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* @internal
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*/
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protected QueueRequestHandler $requestHandler;
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/**
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* Process an incoming server request and produce a response.
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*
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* @param ServerRequest $request The server request to process
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* @param RequestHandler $handler The request handler to delegate to
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*
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* @return Response The response object
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*
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* @api
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*/
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final public function process(ServerRequest $request, RequestHandler $handler): Response
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{
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/** @var QueueRequestHandler $handler */
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$this->requestHandler = $handler;
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// Manipulate request if necessary.
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$request = $this->processRequest($request);
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// Delegate request to next middleware and get response.
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$response = $handler->handle($request);
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// Manipulate response if necessary.
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$response = $this->processResponse($response);
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// Return response to previous middleware.
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return $response;
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}
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/**
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* Process an incoming server request before delegating to next middleware.
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*
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* @param ServerRequest $request The incoming server request
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*
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* @return ServerRequest The processed server request
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*/
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protected function processRequest(ServerRequest $request): ServerRequest
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{
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return $request;
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}
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/**
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* Process an incoming response before returning it to previous middleware.
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*
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* @param Response $response The incoming response
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*
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* @return Response The processed response
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*/
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protected function processResponse(Response $response): Response
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{
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return $response;
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}
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/**
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* Allow the middleware to be invoked directly.
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*
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* @param ServerRequest $request The server request to process
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* @param RequestHandler $handler The request handler to delegate to
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*
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* @return Response The response object
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*
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* @api
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*/
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final public function __invoke(ServerRequest $request, RequestHandler $handler): Response
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{
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return $this->process($request, $handler);
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}
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}
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