<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2019 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace Fisharebest\Webtrees\Http\Middleware;

use Fisharebest\Webtrees\Auth;
use Fisharebest\Webtrees\Exceptions\HttpAccessDeniedException;
use Fisharebest\Webtrees\Exceptions\HttpNotFoundException;
use Fisharebest\Webtrees\Http\RequestHandlers\LoginPage;
use Fisharebest\Webtrees\Tree;
use Fisharebest\Webtrees\User;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;

use function redirect;
use function route;

/**
 * Middleware to restrict access to moderators.
 */
class AuthModerator implements MiddlewareInterface
{
    /**
     * @param ServerRequestInterface  $request
     * @param RequestHandlerInterface $handler
     *
     * @return ResponseInterface
     */
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $tree = $request->getAttribute('tree');

        // We've matched a tree parameter in the route, but it is private or deleted.
        if (!$tree instanceof Tree) {
            throw new HttpNotFoundException();
        }

        $user = $request->getAttribute('user');

        // Logged in with the correct role?
        if (Auth::isModerator($tree, $user)) {
            return $handler->handle($request);
        }

        // Logged in, but without the correct role?
        if ($user instanceof User) {
            throw new HttpAccessDeniedException();
        }

        // Not logged in.
        return redirect(route(LoginPage::class, ['tree' => $tree->name(), 'url' => $request->getUri()]));
    }
}