<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii 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\Services;

use Espo\Core\Exceptions\Forbidden;
use Espo\Core\Exceptions\NotFound;
use Espo\Core\Exceptions\BadRequest;
use Espo\Core\Exceptions\Error;

use Espo\ORM\EntityManager;
use Espo\Entities\User;

use Espo\Core\{
    Utils\Metadata,
    Utils\Config,
    Authentication\LoginFactory,
    Authentication\TwoFactor\UserFactory as TwoFactorUserFactory,
    Authentication\LoginData,
    Api\RequestNull,
};


use StdClass;

class UserSecurity
{
    protected $entityManager;

    protected $user;

    protected $metadata;

    protected $config;

    protected $authLoginFactory;

    protected $auth2FAUserFactory;

    public function __construct(
        EntityManager $entityManager,
        User $user,
        Metadata $metadata,
        Config $config,
        LoginFactory $authLoginFactory,
        TwoFactorUserFactory $auth2FAUserFactory
    ) {
        $this->entityManager = $entityManager;
        $this->user = $user;
        $this->metadata = $metadata;
        $this->config = $config;
        $this->authLoginFactory = $authLoginFactory;
        $this->auth2FAUserFactory = $auth2FAUserFactory;
    }

    public function read(string $id): StdClass
    {
        if (!$this->user->isAdmin() && $id !== $this->user->id) {
            throw new Forbidden();
        }

        $user = $this->entityManager->getEntity('User', $id);

        if (!$user) {
            throw new NotFound();
        }

        if (!$user->isAdmin() && !$user->isRegular()) {
            throw new Forbidden();
        }

        $userData = $this->entityManager->getRepository('UserData')->getByUserId($id);

        return (object) [
            'auth2FA' => $userData->get('auth2FA'),
            'auth2FAMethod' => $userData->get('auth2FAMethod'),
        ];
    }

    public function generate2FAData(string $id, StdClass $data): StdClass
    {
        if (!$this->user->isAdmin() && $id !== $this->user->id) {
            throw new Forbidden();
        }

        $user = $this->entityManager->getEntity('User', $id);

        if (!$user) {
            throw new NotFound();
        }

        if (!$user->isAdmin() && !$user->isRegular()) {
            throw new Forbidden();
        }

        $password = $data->password ?? null;

        if (!$password) {
            throw new Forbidden('Passport required.');
        }

        if (!$this->user->isAdmin() || $this->user->id === $id) {
            $this->checkPassword($id, $password);
        }

        $userData = $this->entityManager->getRepository('UserData')->getByUserId($id);

        $auth2FAMethod = $data->auth2FAMethod ?? null;

        if (!$auth2FAMethod) {
            throw new BadRequest();
        }

        $user = $this->entityManager->getEntity('User', $userData->get('userId'));

        if (!$user) {
            throw new Error("User not found.");
        }

        $impl = $this->auth2FAUserFactory->create($auth2FAMethod);
        $generatedData = $impl->generateData($userData, $data, $user->get('userName'));

        $userData->set($generatedData);

        if (!empty($data->reset)) {
            $userData->set('auth2FA', false);
            $userData->set('auth2FAMethod', null);
        }

        $this->entityManager->saveEntity($userData);

        return $generatedData;
    }

    public function update(string $id, StdClass $data): StdClass
    {
        if (!$this->user->isAdmin() && $id !== $this->user->id) {
            throw new Forbidden();
        }

        $user = $this->entityManager->getEntity('User', $id);

        if (!$user) {
            throw new NotFound();
        }

        if (!$user->isAdmin() && !$user->isRegular()) {
            throw new Forbidden();
        }

        $userData = $this->entityManager->getRepository('UserData')->getByUserId($id);

        $originalData = clone $data;

        $password = $originalData->password ?? null;

        if (!$password) {
            throw new Forbidden('Passport required.');
        }

        if (!$this->user->isAdmin() || $this->user->id === $id) {
            $this->checkPassword($id, $password);
        }

        foreach (get_object_vars($data) as $attribute => $v) {
            if (!in_array($attribute, ['auth2FA', 'auth2FAMethod'])) {
                unset($data->$attribute);
            }
        }

        $userData->set($data);

        if (!$userData->get('auth2FA')) {
            $userData->set('auth2FAMethod', null);
        }

        if ($userData->get('auth2FA') && $userData->isAttributeChanged('auth2FA')) {
            if (!$this->config->get('auth2FA')) {
                throw new Forbidden('2FA is not enabled.');
            }
        }

        if (
            $userData->get('auth2FA') &&
            $userData->get('auth2FAMethod') &&
            ($userData->isAttributeChanged('auth2FA') || $userData->isAttributeChanged('auth2FAMethod'))
        ) {
            $auth2FAMethod = $userData->get('auth2FAMethod');

            if (!in_array($auth2FAMethod, $this->config->get('auth2FAMethodList', []))) {
                throw new Forbidden('Not allowed 2FA auth method.');
            }

            $code = $originalData->code ?? null;

            if (!$code) {
                throw new Forbidden('Not verified.');
            }

            $verifyResult = $this->auth2FAUserFactory->create($auth2FAMethod)->verify($userData, $code);

            if (!$verifyResult) {
                throw new Forbidden('Not verified.');
            }
        }

        $this->entityManager->saveEntity($userData);

        $returnData = (object) [
            'auth2FA' => $userData->get('auth2FA'),
            'auth2FAMethod' => $userData->get('auth2FAMethod'),
        ];

        return $returnData;
    }

    protected function checkPassword(string $id, string $password)
    {
        $method = $this->config->get('authenticationMethod', 'Espo');

        $auth = $this->authLoginFactory->create($method);

        $user = $this->entityManager
            ->getRepository('User')
            ->where([
                'id' => $id,
            ])
            ->findOne();

        if (!$user) {
            throw new Forbidden('User is not found.');
        }

        $loginData = LoginData::createBuilder()
            ->setUsername($user->get('userName'))
            ->setPassword($password)
            ->build();

        $result = $auth->login($loginData, new RequestNull());

        if ($result->isFail()) {
            throw new Forbidden('Password is incorrect.');
        }

        return true;
    }
}