81 lines
2.4 KiB
PHP
81 lines
2.4 KiB
PHP
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<?php
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/**
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* OAI-PMH 2.0 Data Provider
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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\OaiPmh2;
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use GuzzleHttp\Psr7\Utils;
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use OCC\OaiPmh2\Middleware\ErrorHandler;
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use OCC\PSR15\AbstractMiddleware;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\ServerRequestInterface;
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/**
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* Base class for all OAI-PMH requests.
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*
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* @author Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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* @package opencultureconsulting/oai-pmh2
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*/
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abstract class Middleware extends AbstractMiddleware
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{
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/**
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* This holds the prepared response document.
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*/
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protected Document $preparedResponse;
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/**
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* Prepare response document.
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*
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* @param ServerRequestInterface $request The pre-processed request
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*
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* @return void
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*/
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abstract protected function prepareResponse(ServerRequestInterface $request): void;
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/**
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* Process an incoming server request.
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*
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* @param ServerRequestInterface $request The incoming server request
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*
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* @return ServerRequestInterface The processed server request
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*/
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protected function processRequest(ServerRequestInterface $request): ServerRequestInterface
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{
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$this->prepareResponse($request);
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return $request;
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}
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/**
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* Process an incoming response before.
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*
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* @param ResponseInterface $response The incoming response
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*
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* @return ResponseInterface The processed response
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*/
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protected function processResponse(ResponseInterface $response): ResponseInterface
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{
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if (!ErrorHandler::getInstance()->hasErrors() && isset($this->preparedResponse)) {
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$response = $response->withBody(Utils::streamFor((string) $this->preparedResponse));
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}
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return $response;
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}
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}
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