<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Authentication;

use Espo\Entities\{
    User,
    AuthToken,
};

use Espo\Core\{
    ORM\EntityManager,
    Api\Request,
    Utils\Config,
    Utils\ApiKey,
};

class Hmac implements Login
{
    protected $entityManager;
    protected $config;

    public function __construct(EntityManager $entityManager, Config $config)
    {
        $this->entityManager = $entityManager;
        $this->config = $config;
    }

    public function login(
        ?string $username, ?string $password, ?AuthToken $authToken, Request $request, array $params, array &$resultData
    ) :?User {
        $authString = base64_decode($request->getHeader('X-Hmac-Authorization'));

        list($apiKey, $hash) = explode(':', $authString, 2);

        $user = $this->entityManager->getRepository('User')->where([
            'type' => 'api',
            'apiKey' => $apiKey,
            'authMethod' => 'Hmac',
        ])->findOne();

        if (!$user) return null;

        if ($user) {
            $secretKey = (new ApiKey($this->config))->getSecretKeyForUserId($user->id);
            if (!$secretKey) return null;

            $string = $request->getMethod() . ' ' . $request->getResourcePath();

            if ($hash === ApiKey::hash($secretKey, $string)) {
                return $user;
            }

            return null;
        }

        return $user;
    }
}