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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle 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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// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace core\router\middleware;
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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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/**
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* Middleware to normalise the URI path.
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*
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* This middleware will:
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* - remove duplicate /
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* - remove any trailing /
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* - ensure that there is a leading /
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*
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* @package core
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* @copyright 2024 Andrew Lyons <andrew@nicols.co.uk>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class uri_normalisation_middleware implements MiddlewareInterface {
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#[\Override]
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface {
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$uri = $request->getUri();
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$path = $uri->getPath();
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// Remove duplicate slashes.
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$path = preg_replace('@/+@', '/', $path);
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// Remove trailing slashes.
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$path = rtrim($path, '/');
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// Ensure that there is always a path.
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// Note: This must be performed after handling removal of duplicate and trailing slashes.
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if ($path === '') {
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$path = '/';
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}
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if ($uri->getPath() !== $path) {
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// Path has changed. Update it.
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$request = $request->withUri($uri->withPath($path));
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}
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return $handler->handle($request);
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}
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}
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