Initial commit

application/Espo/Tools/OAuth/Api/DeleteConnection.php

@@ -0,0 +1,61 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Record\EntityProvider;
+use Espo\Entities\OAuthAccount;
+use Espo\Tools\OAuth\ConnectionService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class DeleteConnection implements Action
+{
+    public function __construct(
+        private ConnectionService $service,
+        private EntityProvider $entityProvider,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+
+        $account = $this->entityProvider->getByClass(OAuthAccount::class, $id);
+
+        $this->service->disconnect($account);
+
+        return ResponseComposer::json(true);
+    }
+}

application/Espo/Tools/OAuth/Api/PostConnection.php

@@ -0,0 +1,66 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Record\EntityProvider;
+use Espo\Entities\OAuthAccount;
+use Espo\Tools\OAuth\ConnectionService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class PostConnection implements Action
+{
+    public function __construct(
+        private ConnectionService $service,
+        private EntityProvider $entityProvider,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+        $code = $request->getParsedBody()->code ?? null;
+
+        if (!is_string($code)) {
+            throw new BadRequest("No code.");
+        }
+
+        $account = $this->entityProvider->getByClass(OAuthAccount::class, $id);
+
+        $this->service->connect($account, $code);
+
+        return ResponseComposer::json(true);
+    }
+}

application/Espo/Tools/OAuth/ConfigDataProvider.php

@@ -0,0 +1,44 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Utils\Config\ApplicationConfig;
+
+class ConfigDataProvider
+{
+    public function __construct(
+        private ApplicationConfig $config,
+    ) {}
+
+    public function getRedirectUri(): string
+    {
+        return $this->config->getSiteUrl() . '/oauth/callback';
+    }
+}

application/Espo/Tools/OAuth/ConnectionService.php

@@ -0,0 +1,82 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Exceptions\Error;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Entities\OAuthAccount;
+use Espo\ORM\EntityManager;
+use GuzzleHttp\Exception\GuzzleException;
+use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
+
+class ConnectionService
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private GenericProviderFactory $genericProviderFactory,
+        private TokenSetter $tokenSetter,
+    ) {}
+
+    /**
+     * @throws Forbidden
+     * @throws Error
+     */
+    public function connect(OAuthAccount $account, string $code): void
+    {
+        $provider = $account->getProvider();
+
+        if (!$provider->isActive()) {
+            throw new Forbidden("Provider is not active.");
+        }
+
+        $genericProvider = $this->genericProviderFactory->create($provider);
+
+        try {
+            $tokens = $genericProvider->getAccessToken('authorization_code', ['code' => $code]);
+        } catch (GuzzleException $e) {
+            throw new Error("Token request error.", 500, $e);
+        } catch (IdentityProviderException $e) {
+            throw new Error("Token request response error.", 500, $e);
+        }
+
+        $this->tokenSetter->set($account, $tokens);
+
+        $this->entityManager->saveEntity($account);
+    }
+
+    public function disconnect(OAuthAccount $account): void
+    {
+        $account->setAccessToken(null);
+        $account->setRefreshToken(null);
+        $account->setExpiresAt(null);
+
+        $this->entityManager->saveEntity($account);
+    }
+}

application/Espo/Tools/OAuth/Exceptions/AccountNotFound.php

@@ -0,0 +1,33 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Exceptions;
+
+class AccountNotFound extends OAuthException
+{}

application/Espo/Tools/OAuth/Exceptions/NoToken.php

@@ -0,0 +1,33 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Exceptions;
+
+class NoToken extends OAuthException
+{}

application/Espo/Tools/OAuth/Exceptions/OAuthException.php

@@ -0,0 +1,35 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Exceptions;
+
+use Exception;
+
+class OAuthException extends Exception
+{}

application/Espo/Tools/OAuth/Exceptions/ProviderNotAvailable.php

@@ -0,0 +1,33 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Exceptions;
+
+class ProviderNotAvailable extends OAuthException
+{}

application/Espo/Tools/OAuth/Exceptions/TokenObtainingFailure.php

@@ -0,0 +1,33 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth\Exceptions;
+
+class TokenObtainingFailure extends OAuthException
+{}

application/Espo/Tools/OAuth/GenericProviderFactory.php

@@ -0,0 +1,60 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Utils\Crypt;
+use Espo\Entities\OAuthProvider;
+use League\OAuth2\Client\Provider\GenericProvider;
+
+/**
+ * @internal
+ */
+class GenericProviderFactory
+{
+    public function __construct(
+        private ConfigDataProvider $configDataProvider,
+        private Crypt $crypt,
+    ) {}
+
+    public function create(OAuthProvider $provider): GenericProvider
+    {
+        $secret = $this->crypt->decrypt($provider->getClientSecret());
+
+        return new GenericProvider([
+            'clientId' => $provider->getClientId(),
+            'clientSecret' => $secret,
+            'redirectUri'  => $this->configDataProvider->getRedirectUri(),
+            'urlAccessToken' => $provider->getTokenEndpoint(),
+
+            'urlAuthorize' => 'dummy',
+            'urlResourceOwnerDetails' => 'dummy',
+        ]);
+    }
+}

application/Espo/Tools/OAuth/TokenSetter.php

@@ -0,0 +1,62 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Utils\Crypt;
+use Espo\Entities\OAuthAccount;
+use League\OAuth2\Client\Token\AccessTokenInterface;
+
+/**
+ * @internal
+ */
+class TokenSetter
+{
+    public function __construct(
+        private Crypt $crypt,
+    ) {}
+
+    public function set(OAuthAccount $account, AccessTokenInterface $tokens): void
+    {
+        $accessToken = $this->crypt->encrypt($tokens->getToken());
+
+        $refreshToken = $tokens->getRefreshToken() ?
+            $this->crypt->encrypt($tokens->getRefreshToken()) :
+            null;
+
+        $expires = $tokens->getExpires() !== null ?
+            DateTime::fromTimestamp($tokens->getExpires()) :
+            null;
+
+        $account->setAccessToken($accessToken);
+        $account->setRefreshToken($refreshToken);
+        $account->setExpiresAt($expires);
+    }
+}

application/Espo/Tools/OAuth/Tokens.php

@@ -0,0 +1,62 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Field\DateTime;
+use SensitiveParameter;
+
+/**
+ * Immutable.
+ */
+class Tokens
+{
+    public function __construct(
+        #[SensitiveParameter]
+        private string $accessToken,
+        #[SensitiveParameter]
+        private ?string $refreshToken,
+        private ?DateTime $expiresAt,
+    ) {}
+
+    public function getAccessToken(): string
+    {
+        return $this->accessToken;
+    }
+
+    public function getRefreshToken(): ?string
+    {
+        return $this->refreshToken;
+    }
+
+    public function getExpiresAt(): ?DateTime
+    {
+        return $this->expiresAt;
+    }
+}

application/Espo/Tools/OAuth/TokensProvider.php

@@ -0,0 +1,177 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\OAuth;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Utils\Crypt;
+use Espo\Entities\OAuthAccount;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Name\Attribute;
+use Espo\ORM\Query\SelectBuilder;
+use Espo\Tools\OAuth\Exceptions\NoToken;
+use Espo\Tools\OAuth\Exceptions\ProviderNotAvailable;
+use Espo\Tools\OAuth\Exceptions\AccountNotFound;
+use Espo\Tools\OAuth\Exceptions\TokenObtainingFailure;
+use GuzzleHttp\Exception\GuzzleException;
+use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
+use LogicException;
+
+class TokensProvider
+{
+    private const EXPIRATION_LEAD_TIME = 60;
+
+    public function __construct(
+        private EntityManager $entityManager,
+        private GenericProviderFactory $genericProviderFactory,
+        private TokenSetter $tokenSetter,
+        private Crypt $crypt,
+    ) {}
+
+    /**
+     * @throws AccountNotFound
+     * @throws ProviderNotAvailable
+     * @throws NoToken
+     * @throws TokenObtainingFailure
+     */
+    public function get(string $id): Tokens
+    {
+        $account = $this->fetch($id);
+
+        if (
+            $account->getRefreshToken() &&
+            $account->getExpiresAt() &&
+            $account->getExpiresAt()->isLessThan(
+                DateTime::createNow()->addSeconds(self::EXPIRATION_LEAD_TIME)
+            )
+        ) {
+            $this->refresh($account);
+        }
+
+        if (!$account->getAccessToken()) {
+            throw new NoToken();
+        }
+
+        $accessToken = $this->crypt->decrypt($account->getAccessToken());
+
+        $refreshToken = $account->getRefreshToken() ?
+            $this->crypt->decrypt($account->getRefreshToken()) :
+            null;
+
+        return new Tokens(
+            accessToken: $accessToken,
+            refreshToken: $refreshToken,
+            expiresAt: $account->getExpiresAt(),
+        );
+    }
+
+    /**
+     * @throws ProviderNotAvailable
+     * @throws AccountNotFound
+     * @throws NoToken
+     */
+    private function fetch(string $id): OAuthAccount
+    {
+        // Ensuring the token is not being refreshed.
+        $this->entityManager->getTransactionManager()->start();
+
+        $account = $this->entityManager
+            ->getRDBRepositoryByClass(OAuthAccount::class)
+            ->clone(
+                SelectBuilder::create()
+                    ->from(OAuthAccount::ENTITY_TYPE)
+                    ->forShare()
+                    ->build()
+            )
+            ->where([Attribute::ID => $id])
+            ->findOne();
+
+        $this->entityManager->getTransactionManager()->commit();
+
+        if (!$account) {
+            throw new AccountNotFound();
+        }
+
+        if (!$account->getProvider()->isActive()) {
+            throw new ProviderNotAvailable();
+        }
+
+        if (!$account->getAccessToken()) {
+            throw new NoToken();
+        }
+
+        return $account;
+    }
+
+    /**
+     * @throws TokenObtainingFailure
+     * @noinspection PhpDocRedundantThrowsInspection
+     */
+    private function refresh(OAuthAccount $account): void
+    {
+        $this->entityManager
+            ->getTransactionManager()
+            ->run(function () use ($account) {
+                $this->refreshInTransaction($account);
+            });
+    }
+
+    /**
+     * @throws TokenObtainingFailure
+     */
+    private function refreshInTransaction(OAuthAccount $account): void
+    {
+        $refreshToken = $account->getRefreshToken();
+
+        if (!$refreshToken) {
+            throw new LogicException();
+        }
+
+        $refreshToken = $this->crypt->decrypt($refreshToken);
+
+        $this->entityManager
+            ->getRDBRepositoryByClass(OAuthAccount::class)
+            ->forUpdate()
+            ->sth()
+            ->where([Attribute::ID => $account->getId()])
+            ->find();
+
+        $genericProvider = $this->genericProviderFactory->create($account->getProvider());
+
+        try {
+            $tokens = $genericProvider->getAccessToken('refresh_token', ['refresh_token' => $refreshToken]);
+        } catch (GuzzleException|IdentityProviderException $e) {
+            throw new TokenObtainingFailure($e->getMessage(), $e->getCode(), $e);
+        }
+
+        $this->tokenSetter->set($account, $tokens);
+
+        $this->entityManager->saveEntity($account);
+    }
+}