snapshot of https://github.com/espocrm/espocrm.git (master, 2026-09-18; blobs > 131072B omitted)

application/Espo/Tools/OAuthServer/Api/AccessToken/PostRevoke.php

@@ -0,0 +1,61 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Api\AccessToken;
+
+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\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Record\TokenService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class PostRevoke implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private TokenService $service,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+
+        $entity = $this->entityProvider->getByClass(AccessToken::class, $id);
+
+        $this->service->revoke($entity);
+
+        return ResponseComposer::json(true);
+    }
+}

application/Espo/Tools/OAuthServer/Api/AuthorizationCode/PostRevoke.php

@@ -0,0 +1,61 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Api\AuthorizationCode;
+
+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\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\Record\TokenService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class PostRevoke implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private TokenService $service,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+
+        $entity = $this->entityProvider->getByClass(AuthorizationCode::class, $id);
+
+        $this->service->revoke($entity);
+
+        return ResponseComposer::json(true);
+    }
+}

application/Espo/Tools/OAuthServer/Api/GetConsentData.php

@@ -0,0 +1,56 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\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\Tools\OAuthServer\ConsentDataService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class GetConsentData implements Action
+{
+    public function __construct(
+        private ConsentDataService $service,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $clientId = $request->getQueryParam('clientId') ?? throw new BadRequest("No clientId.");
+
+        $data = $this->service->getData($clientId);
+
+        return ResponseComposer::json($data);
+    }
+}

application/Espo/Tools/OAuthServer/Api/RefreshToken/PostRevoke.php

@@ -0,0 +1,61 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Api\RefreshToken;
+
+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\Tools\OAuthServer\Entities\RefreshToken;
+use Espo\Tools\OAuthServer\Record\TokenService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class PostRevoke implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private TokenService $service,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+
+        $entity = $this->entityProvider->getByClass(RefreshToken::class, $id);
+
+        $this->service->revoke($entity);
+
+        return ResponseComposer::json(true);
+    }
+}

application/Espo/Tools/OAuthServer/AuthorizationService.php

@@ -0,0 +1,185 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer;
+
+use Espo\Core\ApplicationState;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Exceptions\Error;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Exceptions\NotFound;
+use Espo\Entities\User;
+use Espo\Tools\OAuthServer\League\AuthorizationRequestStorage;
+use Espo\Tools\OAuthServer\League\AuthorizationServerFactory;
+use Espo\Tools\OAuthServer\League\Entities\ScopeEntity;
+use Espo\Tools\OAuthServer\League\Entities\UserEntity;
+use Espo\Tools\OAuthServer\Scope\ScopeSorter;
+use Espo\Tools\OAuthServer\Utils\UriUtil;
+use League\OAuth2\Server\Exception\OAuthServerException;
+use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class AuthorizationService
+{
+    public function __construct(
+        private AuthorizationServerFactory $authorizationServerFactory,
+        private ApplicationState $applicationState,
+        private AuthorizationRequestStorage $authorizationRequestStorage,
+        private ScopeSorter $scopeSorter,
+    ) {}
+
+    /**
+     * @throws Error
+     */
+    public function authorizeStart(ServerRequestInterface $request, ResponseInterface $response): ?ResponseInterface
+    {
+        $server = $this->authorizationServerFactory->create();
+
+        try {
+            $authRequest = $server->validateAuthorizationRequest($request);
+        } catch (OAuthServerException $e) {
+            return $e->generateHttpResponse($response);
+        }
+
+        $clientId = $authRequest->getClient()->getIdentifier();
+
+        $this->authorizationRequestStorage->store($clientId, $authRequest);
+
+        return null;
+    }
+
+    /**
+     * @param non-empty-string[] $scopes
+     * @throws NotFound
+     * @throws Error
+     * @throws Forbidden
+     * @throws BadRequest
+     * @noinspection PhpRedundantCatchClauseInspection
+     */
+    public function authorizeComplete(
+        string $clientId,
+        ResponseInterface $response,
+        bool $approved,
+        array $scopes,
+    ): ResponseInterface {
+
+        $scopes = $this->scopeSorter->sort($scopes);
+
+        $authorizationRequest = $this->getAuthRequestFromSession($clientId);
+
+        $this->validateScopesOnCompletion($authorizationRequest, $scopes);
+
+        $authorizationRequest->setScopes(array_map(fn ($it) => new ScopeEntity($it), $scopes));
+
+        $user = $this->applicationState->getUser();
+
+        try {
+            $this->assertUser($user, $authorizationRequest);
+        } catch (OAuthServerException $e) {
+            return $e->generateHttpResponse($response);
+        }
+
+        $authorizationRequest->setUser(new UserEntity($user));
+        $authorizationRequest->setAuthorizationApproved($approved);
+
+        $server = $this->authorizationServerFactory->create();
+
+        try {
+            return $server->completeAuthorizationRequest($authorizationRequest, $response);
+        } catch (OAuthServerException $e) {
+            return $e->generateHttpResponse($response);
+        }
+    }
+
+    /**
+     * @throws Error
+     */
+    public function token(ServerRequestInterface $request, ResponseInterface $response): ResponseInterface
+    {
+        $server = $this->authorizationServerFactory->create();
+
+        try {
+            return $server->respondToAccessTokenRequest($request, $response);
+        } catch (OAuthServerException $e) {
+            return $e->generateHttpResponse($response);
+        }
+    }
+
+    /**
+     * @throws NotFound
+     */
+    private function getAuthRequestFromSession(string $clientId): AuthorizationRequest
+    {
+        $authRequest = $this->authorizationRequestStorage->get($clientId, clear: true);
+
+        if (!$authRequest) {
+            throw new NotFound("Session not found.");
+        }
+
+        return $authRequest;
+    }
+
+    /**
+     * @throws Error
+     * @throws OAuthServerException
+     */
+    private function assertUser(User $user, AuthorizationRequest $authorizationRequest): void
+    {
+        if ($user->isRegular() || $user->getType() === User::TYPE_ADMIN) {
+            return;
+        }
+
+        $redirectUri = $authorizationRequest->getRedirectUri();
+
+        if ($redirectUri && $authorizationRequest->getState()) {
+            $redirectUri = UriUtil::makeRedirectUri($redirectUri, $authorizationRequest->getState());
+        }
+
+        throw OAuthServerException::accessDenied("User is not allowed.", $redirectUri);
+    }
+
+    /**
+     * @param string[] $scopes
+     * @throws Forbidden
+     * @throws BadRequest
+     */
+    private function validateScopesOnCompletion(AuthorizationRequest $authorizationRequest, array $scopes): void
+    {
+        if (count(array_unique($scopes)) !== count($scopes)) {
+            throw new BadRequest("Duplicate scopes.");
+        }
+
+        $storedScopes = array_map(fn ($it) => $it->getIdentifier(), $authorizationRequest->getScopes());
+
+        if (array_diff($scopes, $storedScopes)) {
+            throw new Forbidden("Scope mismatch.");
+        }
+    }
+}

application/Espo/Tools/OAuthServer/Cleanup/GeneralCleanup.php

@@ -0,0 +1,165 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Cleanup;
+
+use Espo\Core\Cleanup\Cleanup;
+use Espo\Core\Name\Field;
+use Espo\Core\Utils\Config;
+use Espo\Core\Utils\DateTime;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Name\Attribute;
+use Espo\ORM\Query\Part\Condition as Cond;
+use Espo\ORM\Query\Part\Expression as Expr;
+use Espo\ORM\Query\SelectBuilder;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+
+/**
+ * @noinspection PhpUnused
+ */
+class GeneralCleanup implements Cleanup
+{
+    private const string PERIOD_AUTHORIZATION_CODE = '15 days';
+    private const string PERIOD_ACCESS_TOKEN = '15 days';
+    private const string PERIOD_REFRESH_TOKEN = '15 days';
+
+    public function __construct(
+        private Config $config,
+        private EntityManager $entityManager,
+        private DateTime $dateTime,
+    ) {}
+
+    public function process(): void
+    {
+        $this->processAuthorizationCodes();
+        $this->processRefreshTokens();
+        $this->processAccessTokens();
+    }
+
+    private function getAuthorizationCodePeriod(): string
+    {
+        return $this->config->get('oAuthServer.cleanup.authorizationCodePeriod') ?? self::PERIOD_AUTHORIZATION_CODE;
+    }
+
+    private function getAccessTokenPeriod(): string
+    {
+        return $this->config->get('oAuthServer.cleanup.accessTokenPeriod') ?? self::PERIOD_ACCESS_TOKEN;
+    }
+
+    private function getRefreshTokenPeriod(): string
+    {
+        return $this->config->get('oAuthServer.cleanup.refreshTokenPeriod') ?? self::PERIOD_REFRESH_TOKEN;
+    }
+
+    private function processAuthorizationCodes(): void
+    {
+        $time = $this->dateTime->getNow()
+            ->modify('-' . $this->getAuthorizationCodePeriod());
+
+        $entries = $this->entityManager
+            ->getRDBRepositoryByClass(AuthorizationCode::class)
+            ->sth()
+            ->where([
+                AuthorizationCode::FIELD_EXPIRES_AT . '<=' => $time->toString(),
+            ])
+            ->find();
+
+        foreach ($entries as $entry) {
+            $this->entityManager->removeEntity($entry);
+        }
+    }
+
+    private function processAccessTokens(): void
+    {
+        $time = $this->dateTime->getNow()
+            ->modify('-' . $this->getAccessTokenPeriod());
+
+        $entries = $this->entityManager
+            ->getRDBRepositoryByClass(AccessToken::class)
+            ->sth()
+            ->where([
+                AccessToken::FIELD_EXPIRES_AT . '<=' => $time->toString(),
+            ])
+            ->where(
+                Cond::not(
+                    Cond::exists(
+                        SelectBuilder::create()
+                            ->from(RefreshToken::ENTITY_TYPE, 'r')
+                            ->select(Attribute::ID)
+                            ->where([
+                                'r.' . RefreshToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+                            ])
+                            ->where(
+                                Cond::equal(
+                                    Expr::column(lcfirst(AccessToken::ENTITY_TYPE) . '.' . Attribute::ID),
+                                    Expr::column('r.' . RefreshToken::FIELD_ACCESS_TOKEN . 'Id'),
+                                )
+                            )
+                            ->build()
+                    )
+                )
+            )
+            ->find();
+
+        foreach ($entries as $entry) {
+            $this->entityManager->removeEntity($entry);
+        }
+    }
+
+    private function processRefreshTokens(): void
+    {
+        $time = $this->dateTime->getNow()
+            ->modify('-' . $this->getRefreshTokenPeriod());
+
+        $entries = $this->entityManager
+            ->getRDBRepositoryByClass(RefreshToken::class)
+            ->sth()
+            ->where([
+                'OR' => [
+                    [
+                        RefreshToken::FIELD_EXPIRES_AT . '<=' => $time->toString(),
+                    ],
+                    [
+                        RefreshToken::FIELD_STATUS => [
+                            RefreshToken::STATUS_REVOKED,
+                            RefreshToken::STATUS_EXPIRED,
+                        ],
+                        Field::MODIFIED_AT . '<=' => $time->toString(),
+                    ],
+                ],
+            ])
+            ->find();
+
+        foreach ($entries as $entry) {
+            $this->entityManager->removeEntity($entry);
+        }
+    }
+}

application/Espo/Tools/OAuthServer/ClientType.php

@@ -0,0 +1,36 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer;
+
+enum ClientType: string
+{
+    case Confidential = 'Confidential';
+    case Public = 'Public';
+}

application/Espo/Tools/OAuthServer/ClientValidator.php

@@ -0,0 +1,50 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer;
+
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\Secret\SecretValidator;
+use SensitiveParameter;
+
+class ClientValidator
+{
+    public function __construct(
+        private SecretValidator $secretValidator,
+    ) {}
+
+    public function validate(Client $client, #[SensitiveParameter] ?string $secret): bool
+    {
+        if (!$secret) {
+            return $client->getClientType() === ClientType::Public;
+        }
+
+        return $this->secretValidator->validate($client, $secret);
+    }
+}

application/Espo/Tools/OAuthServer/ConnectedApp/AppData.php

@@ -0,0 +1,48 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\ConnectedApp;
+
+use stdClass;
+
+readonly class AppData
+{
+    public function __construct(
+        public string $id,
+        public ?string $name,
+    ) {}
+
+    public function toApiOutput(): stdClass
+    {
+        return (object) [
+            'id' => $this->id,
+            'name' => $this->name,
+        ];
+    }
+}

application/Espo/Tools/OAuthServer/ConnectedApp/ConnectedAppService.php

@@ -0,0 +1,96 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\ConnectedApp;
+
+use Espo\Core\Exceptions\NotFound;
+use Espo\Entities\User;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\Repository\AccessTokenRepository;
+use Espo\Tools\OAuthServer\Repository\ClientRepository;
+use Espo\Tools\OAuthServer\Repository\RefreshTokenRepository;
+use RuntimeException;
+
+class ConnectedAppService
+{
+    private const int LIMIT = 50;
+
+    public function __construct(
+        private ClientRepository $clientRepository,
+        private RefreshTokenRepository $refreshTokenRepository,
+        private AccessTokenRepository $accessTokenRepository,
+        private EntityManager $entityManager,
+    ) {}
+
+    /**
+     * @return AppData[]
+     */
+    public function getList(User $user): array
+    {
+        $clients = $this->clientRepository->findConnectedForUser($user->getId(), self::LIMIT);
+
+        return array_map(function (Client $it) {
+            $id = $it->getIdentifier() ?? throw new RuntimeException();
+
+            return new AppData(
+                id: $id,
+                name: $it->getName() ?? $id,
+            );
+        }, iterator_to_array($clients));
+    }
+
+    /**
+     * @throws NotFound
+     */
+    public function disconnect(User $user, string $clientId): void
+    {
+        $client = $this->clientRepository->getByIdentifier($clientId);
+
+        if (!$client) {
+            throw new NotFound("Client not found.");
+        }
+
+        $refreshTokens = $this->refreshTokenRepository->findActiveForClientIdAndUser($client->getId(), $user->getId());
+
+        foreach ($refreshTokens as $refreshToken) {
+            $refreshToken->setRevoked();
+
+            $this->entityManager->saveEntity($refreshToken);
+        }
+
+        $accessTokens = $this->accessTokenRepository->findActiveForClientIdAndUser($client->getId(), $user->getId());
+
+        foreach ($accessTokens as $accessToken) {
+            $accessToken->setRevoked();
+
+            $this->entityManager->saveEntity($accessToken);
+        }
+    }
+}

application/Espo/Tools/OAuthServer/ConnectedApp/UserCheck.php

@@ -0,0 +1,46 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\ConnectedApp;
+
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Entities\User;
+
+class UserCheck
+{
+    /**
+     * @throws Forbidden
+     */
+    public function assert(User $user): void
+    {
+        if ($user->getType() !== User::TYPE_ADMIN && !$user->isRegular()) {
+            throw new Forbidden("Only regular users and admins are allowed.");
+        }
+    }
+}

application/Espo/Tools/OAuthServer/ConsentDataService.php

@@ -0,0 +1,165 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer;
+
+use Espo\Core\Acl\Scope;
+use Espo\Core\Exceptions\Error;
+use Espo\Core\Exceptions\NotFound;
+use Espo\Core\Utils\Config\ApplicationConfig;
+use Espo\Core\Utils\Language;
+use Espo\Entities\User;
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\League\AuthorizationRequestStorage;
+use Espo\Tools\OAuthServer\Repository\ClientRepository;
+use Espo\Tools\OAuthServer\Scope\ScopeSorter;
+use Espo\Tools\OAuthServer\Scope\UserAvailableScopesFilter;
+use InvalidArgumentException;
+use stdClass;
+
+class ConsentDataService
+{
+    public function __construct(
+        private ClientRepository $clientRepository,
+        private User $user,
+        private Language $language,
+        private ApplicationConfig $applicationConfig,
+        private AuthorizationRequestStorage $authorizationRequestStorage,
+        private UserAvailableScopesFilter $userAvailableScopesFilter,
+        private ScopeSorter $scopeSorter,
+    ) {}
+
+    /**
+     * @throws NotFound
+     * @throws Error
+     */
+    public function getData(string $clientId): stdClass
+    {
+        $client = $this->getClient($clientId);
+
+        return (object) [
+            'scopeDataList' => $this->getScopeDataList($client),
+            'labels' => (object) [
+                'allow' => $this->language->translateLabel('allow', 'strings', Client::ENTITY_TYPE),
+                'cancel' => $this->language->translateLabel('Cancel'),
+                'info' => $this->composeInfoText($client),
+            ],
+        ];
+    }
+
+    /**
+     * @throws NotFound
+     */
+    private function getClient(string $clientId): Entities\Client
+    {
+        $client = $this->clientRepository->getActiveByIdentifier($clientId);
+
+        if (!$client) {
+            throw new NotFound("Client not found.");
+        }
+
+        return $client;
+    }
+
+    private function translateScope(string $scope): string
+    {
+        $appScope = $scope;
+        $actionLabel = null;
+
+        if (str_contains($scope, ':')) {
+            [$appScope, $action] = explode(':', $appScope, 2);
+
+            $actionLabel = $this->language->translateOption($action, 'levelList', 'Role');
+        }
+
+        $scopeLabel = $this->language->translateLabel($appScope, 'scopeNames');
+
+        $label = $scopeLabel;
+
+        if ($actionLabel) {
+            $label .= ' . ' . $actionLabel;
+        }
+
+        return $label;
+    }
+
+    private function composeInfoText(Client $client): string
+    {
+        return strtr($this->language->translateLabel('allowAccessInfo', 'messages', Client::ENTITY_TYPE), [
+            '{clientName}' => $client->getName(),
+            '{applicationName}' => $this->applicationConfig->getApplicationName(),
+            '{username}' => $this->user->getUserName(),
+        ]);
+    }
+
+    /**
+     * @return stdClass[]
+     * @throws Error
+     */
+    private function getScopeDataList(Client $client): array
+    {
+        $clientId = $client->getIdentifier() ?? throw new InvalidArgumentException("No client identifier.");
+
+        $request = $this->authorizationRequestStorage->get($clientId);
+
+        if (!$request) {
+            throw new Error("No session data.");
+        }
+
+        $scopes = array_map(fn ($it) => $it->getIdentifier(), $request->getScopes());
+
+        $scopes = $this->userAvailableScopesFilter->filter($this->user->getId(), $scopes);
+
+        /** @var (stdClass & object{name: string, label: string})[] $scopeDataList */
+        $scopeDataList = array_map(function ($scope) {
+            return (object) [
+                'name' => $scope,
+                'label' => $this->translateScope($scope),
+                'description' => $this->getScopeDescription($scope),
+            ];
+        }, $scopes);
+
+        return $this->scopeSorter->sortDataItems($scopeDataList);
+    }
+
+    private function getScopeDescription(string $scope): ?string
+    {
+        if (!in_array($scope, [Scope::ADMIN, Scope::GLOBAL])) {
+            return null;
+        }
+
+        $key = $scope;
+
+        if ($scope === Scope::GLOBAL && $this->user->isAdmin()) {
+            $key = 'GlobalAdmin';
+        }
+
+        return $this->language->translateLabel($key, 'scopeDescriptions', Client::ENTITY_TYPE);
+    }
+}

application/Espo/Tools/OAuthServer/Entities/AccessToken.php

@@ -0,0 +1,163 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Entities;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\Core\ORM\Entity;
+use Espo\Entities\User;
+use SensitiveParameter;
+use UnexpectedValueException;
+
+class AccessToken extends Entity
+{
+    public const string ENTITY_TYPE = 'OAuthAccessToken';
+
+    public const string FIELD_STATUS = 'status';
+    public const string FIELD_CLIENT = 'client';
+    public const string FIELD_IDENTIFIER = 'identifier';
+    public const string FIELD_EXPIRES_AT = 'expiresAt';
+    public const string FIELD_SCOPES = 'scopes';
+    public const string FIELD_USER = 'user';
+    public const string FIELD_HASH = 'hash';
+
+    public const string STATUS_ACTIVE = 'Active';
+    public const string STATUS_REVOKED = 'Revoked';
+    public const string STATUS_EXPIRED = 'Expired';
+
+    public function isActive(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_ACTIVE;
+    }
+
+    public function isRevoked(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_REVOKED;
+    }
+
+    public function getClient(): Client
+    {
+        $client = $this->relations->getOne(self::FIELD_CLIENT);
+
+        if (!$client instanceof Client) {
+            throw new UnexpectedValueException("No client.");
+        }
+
+        return $client;
+    }
+
+    public function setClient(Client|Link $client): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_CLIENT, $client);
+    }
+
+    public function setRevoked(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_REVOKED);
+    }
+
+    public function setExpired(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_EXPIRED);
+    }
+
+    public function setHash(string $hash): self
+    {
+        return $this->set(self::FIELD_HASH, $hash);
+    }
+
+    public function setIdentifier(#[SensitiveParameter] string $identifier): self
+    {
+        return $this->set(self::FIELD_IDENTIFIER, $identifier);
+    }
+
+    /**
+     * @return non-empty-string
+     */
+    public function getIdentifier(): string
+    {
+        /** @var non-empty-string */
+        return $this->get(self::FIELD_IDENTIFIER) ?? throw new UnexpectedValueException("No identifier.");
+    }
+
+    public function getExpiresAt(): DateTime
+    {
+        $value = $this->getValueObject(self::FIELD_EXPIRES_AT);
+
+        if (!$value instanceof DateTime) {
+            throw new UnexpectedValueException("No expiresAt.");
+        }
+
+        return $value;
+    }
+
+    public function setExpiresAt(DateTime $expiresAt): self
+    {
+        return $this->setValueObject(self::FIELD_EXPIRES_AT, $expiresAt);
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_EXPIRED;
+    }
+
+    /**
+     * @return non-empty-string[]
+     */
+    public function getScopes(): array
+    {
+        /** @var non-empty-string[] */
+        return $this->get(self::FIELD_SCOPES) ?? [];
+    }
+
+    /**
+     * @param string[] $scopes
+     */
+    public function setScopes(array $scopes): self
+    {
+        return $this->set(self::FIELD_SCOPES, $scopes);
+    }
+
+    public function getUser(): Link
+    {
+        $user = $this->getValueObject(self::FIELD_USER);
+
+        if (!$user instanceof Link) {
+            throw new UnexpectedValueException("No user.");
+        }
+
+        return $user;
+    }
+
+    public function setUser(Link|User $user): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_USER, $user);
+    }
+}

application/Espo/Tools/OAuthServer/Entities/AuthorizationCode.php

@@ -0,0 +1,157 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Entities;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\Core\ORM\Entity;
+use Espo\Entities\User;
+use UnexpectedValueException;
+
+class AuthorizationCode extends Entity
+{
+    public const string ENTITY_TYPE = 'OAuthAuthorizationCode';
+
+    public const string FIELD_STATUS = 'status';
+    public const string FILED_CLIENT = 'client';
+    public const string FIELD_HASH = 'hash';
+    public const string FIELD_EXPIRES_AT = 'expiresAt';
+    public const string FIELD_REDIRECT_URI = 'redirectUri';
+    public const string FIELD_SCOPES = 'scopes';
+    public const string FIELD_USER = 'user';
+
+    public const string STATUS_ACTIVE = 'Active';
+    public const string STATUS_REVOKED = 'Revoked';
+    public const string STATUS_EXPIRED = 'Expired';
+
+    public function isActive(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_ACTIVE;
+    }
+
+    public function isRevoked(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_REVOKED;
+    }
+
+    public function getClient(): Client
+    {
+        $client = $this->relations->getOne(self::FILED_CLIENT);
+
+        if (!$client instanceof Client) {
+            throw new UnexpectedValueException("No client.");
+        }
+
+        return $client;
+    }
+
+    public function setClient(Client|Link $client): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FILED_CLIENT, $client);
+    }
+
+    public function setRevoked(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_REVOKED);
+    }
+
+    public function setExpired(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_EXPIRED);
+    }
+
+    public function setHash(string $hash): self
+    {
+        return $this->set(self::FIELD_HASH, $hash);
+    }
+
+    public function getExpiresAt(): DateTime
+    {
+        $value = $this->getValueObject(self::FIELD_EXPIRES_AT);
+
+        if (!$value instanceof DateTime) {
+            throw new UnexpectedValueException("No expiresAt.");
+        }
+
+        return $value;
+    }
+
+    public function setExpiresAt(DateTime $expiresAt): self
+    {
+        return $this->setValueObject(self::FIELD_EXPIRES_AT, $expiresAt);
+    }
+
+    public function getRedirectUri(): string
+    {
+        return $this->get(self::FIELD_REDIRECT_URI) ?? throw new UnexpectedValueException("No redirectUri.");
+    }
+
+    public function setRedirectUri(string $redirectUri): self
+    {
+        return $this->set(self::FIELD_REDIRECT_URI, $redirectUri);
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_EXPIRED;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getScopes(): array
+    {
+        return $this->get(self::FIELD_SCOPES);
+    }
+
+    /**
+     * @param string[] $scopes
+     */
+    public function setScopes(array $scopes): self
+    {
+        return $this->set(self::FIELD_SCOPES, $scopes);
+    }
+
+    public function getUser(): Link
+    {
+        $user = $this->getValueObject(self::FIELD_USER);
+
+        if (!$user instanceof Link) {
+            throw new UnexpectedValueException("No user.");
+        }
+
+        return $user;
+    }
+
+    public function setUser(Link|User $user): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_USER, $user);
+    }
+}

application/Espo/Tools/OAuthServer/Entities/Client.php

@@ -0,0 +1,142 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Entities;
+
+use Espo\Core\Name\Field;
+use Espo\Core\ORM\Entity;
+use Espo\Tools\OAuthServer\ClientType;
+use UnexpectedValueException;
+
+class Client extends Entity
+{
+    public const string ENTITY_TYPE = 'OAuthClient';
+
+    public const string FIELD_STATUS = 'status';
+    public const string FIELD_IDENTIFIER = 'identifier';
+    public const string FIELD_CLIENT_TYPE = 'clientType';
+    public const string FIELD_SCOPES = 'scopes';
+    public const string FIELD_REDIRECT_URIS = 'redirectUris';
+
+    public const string LINK_SECRETS = 'secrets';
+
+    public const string STATUS_ACTIVE = 'Active';
+    public const string STATUS_INACTIVE = 'Inactive';
+
+    public function getName(): ?string
+    {
+        return $this->get(Field::NAME);
+    }
+
+    public function setName(string $name): self
+    {
+        return $this->set(Field::NAME, $name);
+    }
+
+    public function getClientType(): ClientType
+    {
+        $raw = $this->get(self::FIELD_CLIENT_TYPE) ?? throw new UnexpectedValueException("No client type.");
+
+        return ClientType::tryFrom($raw) ?? throw new UnexpectedValueException("Bad client type.");
+    }
+
+    public function setClientType(ClientType $clientType): self
+    {
+        return $this->set(self::FIELD_CLIENT_TYPE, $clientType->value);
+    }
+
+    /**
+     * @return ?non-empty-string
+     */
+    public function getIdentifier(): ?string
+    {
+        /** @var ?non-empty-string */
+        return $this->get(self::FIELD_IDENTIFIER);
+    }
+
+    public function setIdentifier(?string $clientId): self
+    {
+        return $this->set(self::FIELD_IDENTIFIER, $clientId);
+    }
+
+    public function isActive(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_ACTIVE;
+    }
+
+    public function setActive(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_ACTIVE);
+    }
+
+    public function setInactive(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_INACTIVE);
+    }
+
+    /**
+     * @return non-empty-string[]
+     */
+    public function getScopes(): array
+    {
+        $scopes = $this->get(self::FIELD_SCOPES) ?? [];
+
+        foreach ($scopes as $scope) {
+            if (!$scope) {
+                throw new UnexpectedValueException("Empty scope.");
+            }
+        }
+
+        return $scopes;
+    }
+
+    /**
+     * @param string[] $scopes
+     */
+    public function setScopes(array $scopes): self
+    {
+        return $this->set(self::FIELD_SCOPES, $scopes);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getRedirectUris(): array
+    {
+        return $this->get(self::FIELD_REDIRECT_URIS) ?? [];
+    }
+
+    /**
+     * @param string[] $redirectUris
+     */
+    public function setRedirectUris(array $redirectUris): self
+    {
+        return $this->set(self::FIELD_REDIRECT_URIS, $redirectUris);
+    }
+}

application/Espo/Tools/OAuthServer/Entities/ClientSecret.php

@@ -0,0 +1,135 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Entities;
+
+use Espo\Core\Field\Date;
+use Espo\Core\Name\Field;
+use Espo\Core\ORM\Entity;
+use SensitiveParameter;
+use UnexpectedValueException;
+
+class ClientSecret extends Entity
+{
+    public const string ENTITY_TYPE = 'OAuthClientSecret';
+
+    public const string FIELD_STATUS = 'status';
+    public const string FIELD_HASH = 'hash';
+    public const string FIELD_CLIENT = 'client';
+    public const string FIELD_EXPIRATION_DATE = 'expirationDate';
+    public const string FIELD_VALUE = 'value';
+
+    public const string STATUS_ACTIVE = 'Active';
+    public const string STATUS_REVOKED = 'Revoked';
+    public const string STATUS_EXPIRED = 'Expired';
+
+    public const string ATTR_CLIENT_ID = 'clientId';
+
+    public function setName(string $name): self
+    {
+        return $this->set(Field::NAME, $name);
+    }
+
+    public function getName(): ?string
+    {
+        return $this->get(Field::NAME);
+    }
+
+    public function getHash(): string
+    {
+        return $this->get(self::FIELD_HASH) ?? throw new UnexpectedValueException("No hash.");
+    }
+
+    public function setHash(string $value): self
+    {
+        return $this->set(self::FIELD_HASH, $value);
+    }
+
+    public function isActive(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_ACTIVE;
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_EXPIRED;
+    }
+
+    public function isRevoked(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_REVOKED;
+    }
+
+    public function setRevoked(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_REVOKED);
+    }
+
+    public function setExpired(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_EXPIRED);
+    }
+
+    public function getExpirationDate(): ?Date
+    {
+        /** @var ?Date */
+        return $this->getValueObject(self::FIELD_EXPIRATION_DATE);
+    }
+
+    public function setExpirationDate(?Date $date): self
+    {
+        return $this->setValueObject(self::FIELD_EXPIRATION_DATE, $date);
+    }
+
+    public function getClient(): Client
+    {
+        $client = $this->relations->getOne(self::FIELD_CLIENT);
+
+        if (!$client instanceof Client) {
+            throw new UnexpectedValueException("No client.");
+        }
+
+        return $client;
+    }
+
+    public function setClient(Client $client): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_CLIENT, $client);
+    }
+
+    public function setValue(#[SensitiveParameter] string $value): self
+    {
+        return $this->set(self::FIELD_VALUE, $value);
+    }
+
+    public function getValue(): string
+    {
+        return $this->get(self::FIELD_VALUE) ?? throw new UnexpectedValueException("No value.");
+    }
+}

application/Espo/Tools/OAuthServer/Entities/RefreshToken.php

@@ -0,0 +1,146 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Entities;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\Core\ORM\Entity;
+use Espo\Entities\User;
+use UnexpectedValueException;
+
+class RefreshToken extends Entity
+{
+    public const string ENTITY_TYPE = 'OAuthRefreshToken';
+
+    public const string FIELD_STATUS = 'status';
+    public const string FIELD_CLIENT = 'client';
+    public const string FIELD_EXPIRES_AT = 'expiresAt';
+    public const string FIELD_USER = 'user';
+    public const string FIELD_ACCESS_TOKEN = 'accessToken';
+    public const string FIELD_HASH = 'hash';
+
+    public const string STATUS_ACTIVE = 'Active';
+    public const string STATUS_REVOKED = 'Revoked';
+    public const string STATUS_EXPIRED = 'Expired';
+
+    public function setHash(string $value): self
+    {
+        return $this->set(self::FIELD_HASH, $value);
+    }
+
+    public function isActive(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_ACTIVE;
+    }
+
+    public function isRevoked(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_REVOKED;
+    }
+
+    public function setStatus(string $status): self
+    {
+        return $this->set(self::FIELD_STATUS, $status);
+    }
+
+    public function getClient(): Client
+    {
+        $client = $this->relations->getOne(self::FIELD_CLIENT);
+
+        if (!$client instanceof Client) {
+            throw new UnexpectedValueException("No client.");
+        }
+
+        return $client;
+    }
+
+    public function setAccessToken(AccessToken $accessToken): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_ACCESS_TOKEN, $accessToken);
+    }
+
+    public function setClient(Client $client): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_CLIENT, $client);
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->get(self::FIELD_STATUS) === self::STATUS_EXPIRED;
+    }
+
+    public function setRevoked(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_REVOKED);
+    }
+
+    public function setExpired(): self
+    {
+        return $this->set(self::FIELD_STATUS, self::STATUS_EXPIRED);
+    }
+
+    public function getExpiresAt(): DateTime
+    {
+        $value = $this->getValueObject(self::FIELD_EXPIRES_AT);
+
+        if (!$value instanceof DateTime) {
+            throw new UnexpectedValueException("No expiresAt.");
+        }
+
+        return $value;
+    }
+
+    public function setExpiresAt(DateTime $expiresAt): self
+    {
+        return $this->setValueObject(self::FIELD_EXPIRES_AT, $expiresAt);
+    }
+
+    public function getUser(): Link
+    {
+        $user = $this->getValueObject(self::FIELD_USER);
+
+        if (!$user instanceof Link) {
+            throw new UnexpectedValueException("No user.");
+        }
+
+        return $user;
+    }
+
+    public function setUser(Link|User $user): self
+    {
+        return $this->setRelatedLinkOrEntity(self::FIELD_USER, $user);
+    }
+
+    public function getAccessToken(): ?AccessToken
+    {
+        /** @var ?AccessToken */
+        return $this->relations->getOne(self::FIELD_ACCESS_TOKEN);
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/AuthorizationServerMetadata.php

@@ -0,0 +1,53 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Core\Utils\Json;
+use Espo\Tools\OAuthServer\Metadata\AuthorizationServerMetadataProvider;
+
+/**
+ * @noinspection PhpUnused
+ */
+class AuthorizationServerMetadata implements EntryPoint
+{
+    public function __construct(
+        private AuthorizationServerMetadataProvider $provider,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $data = $this->provider->get();
+
+        $response->writeBody(Json::encode($data, JSON_PRETTY_PRINT));
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/Authorize.php

@@ -0,0 +1,74 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Core\Utils\Client\ActionRenderer;
+use Espo\Core\Utils\Client\SecurityParams;
+use Espo\Tools\OAuthServer\AuthorizationService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class Authorize implements EntryPoint
+{
+    public function __construct(
+        private ActionRenderer $actionRenderer,
+        private AuthorizationService $service,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $psr7Response = $this->service->authorizeStart($request->toPsr7(), $response->toPsr7());
+
+        if ($psr7Response) {
+            $response->applyPsr7($psr7Response);
+
+            return;
+        }
+
+        $params = new ActionRenderer\Params(
+            controller: 'controllers/o-auth-authorize',
+            action: 'show',
+        );
+
+        $params = $params
+            ->withLogin()
+            ->withSecurityParams(
+                new SecurityParams(
+                    formAction: [],
+                )
+            );
+
+        $this->actionRenderer->write($response, $params);
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/AuthorizeComplete.php

@@ -0,0 +1,93 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Tools\OAuthServer\AuthorizationService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class AuthorizeComplete implements EntryPoint
+{
+    public function __construct(
+        private AuthorizationService $service,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $body = $request->getParsedBody();
+
+        $clientId = $body->clientId ?? throw new BadRequest("No 'clientId'.");
+        $approved = ($body->approved ?? null) === 'true';
+
+        if (!is_string($clientId)) {
+            throw new BadRequest();
+        }
+
+        $scopes = $this->fetchScopes($request);
+
+        $psr7Response = $this->service->authorizeComplete(
+            clientId: $clientId,
+            response: $response->toPsr7(),
+            approved: $approved,
+            scopes: $scopes,
+        );
+
+        $response->applyPsr7($psr7Response);
+    }
+
+    /**
+     * @return non-empty-string[]
+     * @throws BadRequest
+     */
+    private function fetchScopes(Request $request): array
+    {
+        $scopesRaw = $request->getParsedBody()->scopes ?? throw new BadRequest("No 'scopes'.");
+
+        $scopes = explode(' ', $scopesRaw);
+
+        foreach ($scopes as $scope) {
+            if (!$scope) {
+                throw new BadRequest("Bad 'scopes' item values.");
+            }
+
+            if ($scope !== trim($scope)) {
+                throw new BadRequest("Bad scope.");
+            }
+        }
+
+        /** @var non-empty-string[] */
+        return $scopes;
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/ProtectedResourceMetadata.php

@@ -0,0 +1,53 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Core\Utils\Json;
+use Espo\Tools\OAuthServer\Metadata\ProtectedResourceMetadataProvider;
+
+/**
+ * @noinspection PhpUnused
+ */
+class ProtectedResourceMetadata implements EntryPoint
+{
+    public function __construct(
+        private ProtectedResourceMetadataProvider $provider,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $data = $this->provider->get();
+
+        $response->writeBody(Json::encode($data, JSON_PRETTY_PRINT));
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/Token.php

@@ -0,0 +1,49 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Tools\OAuthServer\AuthorizationService;
+
+class Token implements EntryPoint
+{
+    public function __construct(
+        private AuthorizationService $service,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $psr7Response = $this->service->token($request->toPsr7(), $response->toPsr7());
+
+        $response->applyPsr7($psr7Response);
+    }
+}

application/Espo/Tools/OAuthServer/EntryPoints/TokenRevoke.php

@@ -0,0 +1,173 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\EntryPoints;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\EntryPoint\EntryPoint;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Exceptions\Unauthorized;
+use Espo\Tools\OAuthServer\Revoke\Data;
+use Espo\Tools\OAuthServer\Revoke\TokenRevokeService;
+use Espo\Tools\OAuthServer\Utils\ErrorResponseComposer;
+
+/**
+ * @noinspection PhpUnused
+ */
+class TokenRevoke implements EntryPoint
+{
+    private const string HEADER_AUTHORIZATION = 'Authorization';
+
+    public function __construct(
+        private TokenRevokeService $service,
+    ) {}
+
+    public function run(Request $request, Response $response): void
+    {
+        $token = $request->getParsedBody()->token ?? throw new BadRequest("No 'token'.");
+        $tokenTypeHint = $request->getParsedBody()->token_type_hint ?? null;
+
+        [$clientId, $clientSecret] = $this->obtainAuthorizationFromHeader($request);
+
+        $clientId ??= $request->getParsedBody()->client_id ?? throw new BadRequest("No client ID.");
+        $clientSecret ??= $request->getParsedBody()->client_secret ?? null;
+
+        if (!is_string($clientId)) {
+            throw new BadRequest("Bad 'client_id' value");
+        }
+
+        if ($clientSecret !== null && !is_string($clientSecret)) {
+            throw new BadRequest("Bad 'client_secret' value");
+        }
+
+        if (!is_string($token)) {
+            throw new BadRequest("Bad 'token' value.");
+        }
+
+        if ($tokenTypeHint !== null && !is_string($tokenTypeHint)) {
+            throw new BadRequest("Bad 'token_type_hint' value.");
+        }
+
+        if (!$this->isTokenTypeValid($tokenTypeHint)) {
+            $response->applyPsr7(
+                ErrorResponseComposer::compose(
+                    error: 'unsupported_token_type',
+                    errorDescription: 'Token type is not supported.',
+                    statusCode: 400,
+                )->toPsr7()
+            );
+
+            return;
+        }
+
+        $data = new Data(
+            clientId: $clientId,
+            clientSecret: $clientSecret,
+            token: $token,
+            tokenTypeHint: $tokenTypeHint,
+        );
+
+        try {
+            $this->service->revoke($data);
+        } catch (Unauthorized) {
+            $response->applyPsr7(
+                ErrorResponseComposer::compose(
+                    error: 'invalid_client',
+                    errorDescription: 'Invalid client credentials.',
+                    statusCode: 401,
+                )->toPsr7()
+            );
+        }
+    }
+
+    private function isTokenTypeValid(?string $tokenTypeHint): bool
+    {
+        return
+            $tokenTypeHint === null ||
+            in_array($tokenTypeHint, [
+                TokenRevokeService::TYPE_ACCESS_TOKEN,
+                TokenRevokeService::TYPE_REFRESH_TOKEN,
+            ]);
+    }
+
+    /**
+     * @return array{?string, ?string}
+     * @throws BadRequest
+     */
+    private function obtainAuthorizationFromHeader(Request $request): array
+    {
+        $headerValue = $request->getHeader(self::HEADER_AUTHORIZATION);
+
+        if (!$headerValue) {
+            return [null, null];
+        }
+
+        $prefix = 'Basic ';
+
+        if (!str_starts_with($headerValue, $prefix)) {
+            return [null, null];
+        }
+
+        $string = substr($headerValue, strlen($prefix));
+
+        [$clientId, $clientSecret] = self::decodeAuthorizationString($string);
+
+        if (!$clientId) {
+            $clientId = null;
+        }
+
+        if (!$clientSecret) {
+            $clientSecret = null;
+        }
+
+        return [$clientId, $clientSecret];
+    }
+
+    /**
+     * @return array{string, string}
+     * @throws BadRequest
+     */
+    private function decodeAuthorizationString(string $string): array
+    {
+        /** @var string $stringDecoded */
+        $stringDecoded = base64_decode($string);
+
+        if (!str_contains($stringDecoded, ':')) {
+            throw new BadRequest("Bad authorization string.");
+        }
+
+        [$username, $password] = explode(':', $stringDecoded, 2);
+
+        $username = trim($username);
+        $password = trim($password);
+
+        return [$username, $password];
+    }
+}

application/Espo/Tools/OAuthServer/ExpireService.php

@@ -0,0 +1,115 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer;
+
+use Espo\Core\Utils\DateTime;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\UpdateBuilder;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\Entities\ClientSecret;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+
+/**
+ * Sets status Expired. Note that even Active status with the expiration date in past
+ * renders the token/secret inactive. Expired status serves an information purpose.
+ */
+class ExpireService
+{
+    public function __construct(
+        private DateTime $dateTime,
+        private EntityManager $entityManager,
+    ) {}
+
+    public function expireClientSecrets(): void
+    {
+        $secrets = $this->entityManager
+            ->getRDBRepositoryByClass(ClientSecret::class)
+            ->where([
+                ClientSecret::FIELD_STATUS => ClientSecret::STATUS_ACTIVE,
+                ClientSecret::FIELD_EXPIRATION_DATE . '<=' => $this->dateTime->getToday()->toString(),
+            ])
+            ->find();
+
+        foreach ($secrets as $secret) {
+            $secret->setExpired();
+
+            $this->entityManager->saveEntity($secret);
+        }
+    }
+
+    public function expireAccessTokens(): void
+    {
+        $query = UpdateBuilder::create()
+            ->in(AccessToken::ENTITY_TYPE)
+            ->set([
+                AccessToken::FIELD_STATUS => AccessToken::STATUS_EXPIRED,
+            ])
+            ->where([
+                AccessToken::FIELD_STATUS => AccessToken::STATUS_ACTIVE,
+                AccessToken::FIELD_EXPIRES_AT . '<=' => $this->dateTime->getNow()->toString(),
+            ])
+            ->build();
+
+        $this->entityManager->getQueryExecutor()->execute($query);
+    }
+
+    public function expireRefreshTokens(): void
+    {
+        $query = UpdateBuilder::create()
+            ->in(RefreshToken::ENTITY_TYPE)
+            ->set([
+                RefreshToken::FIELD_STATUS => RefreshToken::STATUS_EXPIRED,
+            ])
+            ->where([
+                RefreshToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+                RefreshToken::FIELD_EXPIRES_AT . '<=' => $this->dateTime->getNow()->toString(),
+            ])
+            ->build();
+
+        $this->entityManager->getQueryExecutor()->execute($query);
+    }
+
+    public function expireAuthorizationCodes(): void
+    {
+        $query = UpdateBuilder::create()
+            ->in(AuthorizationCode::ENTITY_TYPE)
+            ->set([
+                AuthorizationCode::FIELD_STATUS => AuthorizationCode::STATUS_EXPIRED,
+            ])
+            ->where([
+                AuthorizationCode::FIELD_STATUS => AuthorizationCode::STATUS_ACTIVE,
+                AuthorizationCode::FIELD_EXPIRES_AT . '<=' => $this->dateTime->getNow()->toString(),
+            ])
+            ->build();
+
+        $this->entityManager->getQueryExecutor()->execute($query);
+    }
+}

application/Espo/Tools/OAuthServer/Jobs/OAuthServerControl.php

@@ -0,0 +1,51 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Jobs;
+
+use Espo\Core\Job\JobDataLess;
+use Espo\Tools\OAuthServer\ExpireService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class OAuthServerControl implements JobDataLess
+{
+    public function __construct(
+        private ExpireService $clientSecretExpireService,
+    ) {}
+
+    public function run(): void
+    {
+        $this->clientSecretExpireService->expireClientSecrets();
+        $this->clientSecretExpireService->expireAccessTokens();
+        $this->clientSecretExpireService->expireRefreshTokens();
+        $this->clientSecretExpireService->expireAuthorizationCodes();
+    }
+}

application/Espo/Tools/OAuthServer/League/AuthorizationRequestStorage.php

@@ -0,0 +1,91 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League;
+
+use Espo\Core\Session\Session;
+use Espo\Tools\OAuthServer\League\Entities\AuthCodeEntity;
+use Espo\Tools\OAuthServer\League\Entities\ClientEntity;
+use Espo\Tools\OAuthServer\League\Entities\ScopeEntity;
+use InvalidArgumentException;
+use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
+use League\OAuth2\Server\RequestTypes\AuthorizationRequestInterface;
+use RuntimeException;
+
+class AuthorizationRequestStorage
+{
+    public function __construct(
+        private Session $session,
+    ) {}
+
+    public function store(string $clientId, AuthorizationRequestInterface $request): void
+    {
+        /** @noinspection PhpConditionAlreadyCheckedInspection */
+        if (!$request instanceof AuthorizationRequest) {
+            throw new InvalidArgumentException("Unsupported authorization request instance.");
+        }
+
+        $this->session->set(self::composeSessionKey($clientId), serialize($request));
+    }
+
+    public function get(string $clientId, bool $clear = false): ?AuthorizationRequest
+    {
+        $key = self::composeSessionKey($clientId);
+
+        $raw = $this->session->get($key);
+
+        if (!$raw) {
+            return null;
+        }
+
+        if ($clear) {
+            $this->session->clear($key);
+        }
+
+        $request = unserialize($raw, [
+            'allowed_classes' => [
+                AuthorizationRequest::class,
+                ClientEntity::class,
+                ScopeEntity::class,
+                AuthCodeEntity::class,
+            ]
+        ]);
+
+        if (!$request instanceof AuthorizationRequest) {
+            throw new RuntimeException("Unserialization error.");
+        }
+
+        return $request;
+    }
+
+    public static function composeSessionKey(string $clientId): string
+    {
+        return "oAuthServerAuthorizeRequest_" . $clientId;
+    }
+}

application/Espo/Tools/OAuthServer/League/AuthorizationServerFactory.php

@@ -0,0 +1,132 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League;
+
+use Espo\Core\Exceptions\Error;
+use Espo\Tools\OAuthServer\League\Repositories\AccessTokenRepository;
+use Espo\Tools\OAuthServer\League\Repositories\AuthCodeRepository;
+use Espo\Tools\OAuthServer\League\Repositories\ClientRepository;
+use Espo\Tools\OAuthServer\League\Repositories\RefreshTokenRepository;
+use Espo\Tools\OAuthServer\League\Repositories\ScopeRepository;
+use Espo\Tools\OAuthServer\Utils\CryptKeyProvider;
+use Exception;
+
+use League\OAuth2\Server\AuthorizationServer;
+use League\OAuth2\Server\CryptKey;
+use League\OAuth2\Server\Grant\AuthCodeGrant;
+use League\OAuth2\Server\Grant\RefreshTokenGrant;
+
+class AuthorizationServerFactory
+{
+    public function __construct(
+        private ClientRepository $clientRepository,
+        private AccessTokenRepository $accessTokenRepository,
+        private ScopeRepository $scopeRepository,
+        private AuthCodeRepository $authCodeRepository,
+        private RefreshTokenRepository $refreshTokenRepository,
+        private CryptKeyProvider $cryptKeyProvider,
+        private ConfigDataProvider $configDataProvider,
+    ) {}
+
+    /**
+     * @throws Error
+     */
+    public function create(): AuthorizationServer
+    {
+        $server = new AuthorizationServer(
+            clientRepository: $this->clientRepository,
+            accessTokenRepository: $this->accessTokenRepository,
+            scopeRepository: $this->scopeRepository,
+            privateKey: $this->createPrivateKeyStub(),
+            encryptionKey: $this->cryptKeyProvider->getCryptKey(),
+        );
+
+        $server->revokeRefreshTokens(true);
+
+        $this->enableAuthorizationCodeGrant($server);
+        $this->enableRefreshTokenGrant($server);
+
+        return $server;
+    }
+
+    /**
+     * @throws Error
+     */
+    private function enableAuthorizationCodeGrant(AuthorizationServer $server): void
+    {
+        try {
+            $grant = new AuthCodeGrant(
+                authCodeRepository: $this->authCodeRepository,
+                refreshTokenRepository: $this->refreshTokenRepository,
+                authCodeTTL: $this->configDataProvider->getAuthorizationCodeTtl(),
+            );
+        } catch (Exception $e) {
+            throw new Error("Error occurred.", previous: $e);
+        }
+
+        $server->enableGrantType(
+            grantType: $grant,
+            accessTokenTTL: $this->configDataProvider->getAccessTokenTtl(),
+        );
+    }
+
+    /**
+     * @throws Error
+     */
+    private function enableRefreshTokenGrant(AuthorizationServer $server): void
+    {
+        try {
+            $grant = new RefreshTokenGrant($this->refreshTokenRepository);
+        } catch (Exception $e) {
+            throw new Error("Error occurred.", previous: $e);
+        }
+
+        $grant->setRefreshTokenTTL($this->configDataProvider->getRefreshTokenTtl());
+
+        $server->enableGrantType(
+            grantType: $grant,
+            accessTokenTTL: $this->configDataProvider->getAccessTokenTtl(),
+        );
+    }
+
+    /**
+     * Access token encryption is not used. Opaque tokens are used.
+     */
+    private function createPrivateKeyStub(): CryptKey
+    {
+        return new class() extends CryptKey {
+
+            /**
+             * @noinspection PhpMissingParentConstructorInspection
+             */
+            public function __construct() {}
+        };
+    }
+}

application/Espo/Tools/OAuthServer/League/ConfigDataProvider.php

@@ -0,0 +1,78 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League;
+
+use Espo\Core\Utils\Config;
+use DateInterval;
+use DateMalformedIntervalStringException;
+use RuntimeException;
+
+class ConfigDataProvider
+{
+    private const string AUTHORIZATION_CODE_TTL = 'PT10M';
+    private const string ACCESS_TOKEN_TTL = 'PT1H';
+    private const string REFRESH_TOKEN_TTL = 'P1M';
+
+    public function __construct(
+        private Config $config,
+    ) {}
+
+    public function getAuthorizationCodeTtl(): DateInterval
+    {
+        $interval = $this->config->get('oAuthServer.ttl.authorizationCode') ?? self::AUTHORIZATION_CODE_TTL;
+
+        return self::convertIntervalToDateInterval($interval);
+    }
+
+    public function getAccessTokenTtl(): DateInterval
+    {
+        $interval = $this->config->get('oAuthServer.ttl.accessToken') ?? self::ACCESS_TOKEN_TTL;
+
+        return self::convertIntervalToDateInterval($interval);
+    }
+
+    public function getRefreshTokenTtl(): DateInterval
+    {
+        $interval = $this->config->get('oAuthServer.ttl.refreshToken') ?? self::REFRESH_TOKEN_TTL;
+
+        return self::convertIntervalToDateInterval($interval);
+    }
+
+    private static function convertIntervalToDateInterval(mixed $interval): DateInterval
+    {
+        try {
+            $value = new DateInterval($interval);
+        } catch (DateMalformedIntervalStringException $e) {
+            throw new RuntimeException("Bad interval '$interval'.", previous: $e);
+        }
+
+        return $value;
+    }
+}

application/Espo/Tools/OAuthServer/League/Entities/AccessTokenEntity.php

@@ -0,0 +1,146 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use DateTimeImmutable;
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use InvalidArgumentException;
+use League\OAuth2\Server\CryptKeyInterface;
+use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
+
+class AccessTokenEntity implements AccessTokenEntityInterface
+{
+    public function __construct(
+        private AccessToken $entity,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function toString(): string
+    {
+        return $this->entity->getIdentifier();
+    }
+
+    /**
+     * @inheritDoc
+     * @return void
+     */
+    public function setPrivateKey(CryptKeyInterface $privateKey): void
+    {}
+
+    public function __toString()
+    {
+        return $this->toString();
+    }
+
+    public function getIdentifier(): string
+    {
+        return $this->entity->getIdentifier();
+    }
+
+    public function setIdentifier(string $identifier): void
+    {
+        $this->entity->setIdentifier($identifier);
+
+        $hash = $this->hasher->hash($identifier);
+
+        $this->entity->setHash($hash);
+    }
+
+    public function getExpiryDateTime(): DateTimeImmutable
+    {
+        return $this->entity->getExpiresAt()->toDateTime();
+    }
+
+    public function setExpiryDateTime(DateTimeImmutable $dateTime): void
+    {
+        $this->entity->setExpiresAt(DateTime::fromDateTime($dateTime));
+    }
+
+    public function setUserIdentifier(string $identifier): void
+    {
+        $link = Link::create($identifier);
+
+        $this->entity->setUser($link);
+    }
+
+    public function getUserIdentifier(): ?string
+    {
+        /** @var non-empty-string */
+        return $this->entity->getUser()->getId();
+    }
+
+    public function getClient(): ClientEntityInterface
+    {
+        return ClientEntity::fromEntity($this->entity->getClient());
+    }
+
+
+    public function setClient(ClientEntityInterface $client): void
+    {
+        /** @noinspection PhpConditionAlreadyCheckedInspection */
+        if (!$client instanceof ClientEntity) {
+            throw new InvalidArgumentException("Not supported client entity.");
+        }
+
+        $this->entity->setClient(Link::create($client->entityId));
+    }
+
+
+    public function addScope(ScopeEntityInterface $scope): void
+    {
+        $scopes = $this->entity->getScopes();
+
+        if (!in_array($scope->getIdentifier(), $scopes)) {
+            $scopes[] = $scope->getIdentifier();
+        }
+
+        $this->entity->setScopes($scopes);
+    }
+
+    /**
+     * @return ScopeEntityInterface[]
+     */
+    public function getScopes(): array
+    {
+        $scopes = $this->entity->getScopes();
+
+        return array_map(fn ($scope) => new ScopeEntity($scope), $scopes);
+    }
+
+    public function getEntity(): AccessToken
+    {
+        return $this->entity;
+    }
+}

application/Espo/Tools/OAuthServer/League/Entities/AuthCodeEntity.php

@@ -0,0 +1,42 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use League\OAuth2\Server\Entities\AuthCodeEntityInterface;
+use League\OAuth2\Server\Entities\Traits\AuthCodeTrait;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
+
+class AuthCodeEntity implements AuthCodeEntityInterface
+{
+    use EntityTrait;
+    use AuthCodeTrait;
+    use TokenEntityTrait;
+}

application/Espo/Tools/OAuthServer/League/Entities/ClientEntity.php

@@ -0,0 +1,87 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use Espo\Tools\OAuthServer\ClientType;
+use Espo\Tools\OAuthServer\Entities\Client;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use UnexpectedValueException;
+
+class ClientEntity implements ClientEntityInterface
+{
+    /**
+     * @param non-empty-string $identifier
+     * @param string[] $redirectUri
+     */
+    public function __construct(
+        public string $entityId,
+        private string $identifier,
+        private string $name,
+        private array $redirectUri,
+        private bool $isConfidential,
+    ) {}
+
+    public static function fromEntity(Client $entity): self
+    {
+        return new self(
+            entityId: $entity->getId(),
+            identifier: $entity->getIdentifier() ?? throw new UnexpectedValueException("No client identifier."),
+            name: $entity->getName() ?? $entity->getId(),
+            redirectUri: $entity->getRedirectUris(),
+            isConfidential: $entity->getClientType() === ClientType::Confidential,
+        );
+    }
+
+    /**
+     * @return non-empty-string
+     */
+    public function getIdentifier(): string
+    {
+        return $this->identifier;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getRedirectUri(): array
+    {
+        return $this->redirectUri;
+    }
+
+    public function isConfidential(): bool
+    {
+        return $this->isConfidential;
+    }
+}

application/Espo/Tools/OAuthServer/League/Entities/RefreshTokenEntity.php

@@ -0,0 +1,40 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use League\OAuth2\Server\Entities\RefreshTokenEntityInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\RefreshTokenTrait;
+
+class RefreshTokenEntity implements RefreshTokenEntityInterface
+{
+    use RefreshTokenTrait;
+    use EntityTrait;
+}

application/Espo/Tools/OAuthServer/League/Entities/ScopeEntity.php

@@ -0,0 +1,53 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
+use League\OAuth2\Server\Entities\Traits\ScopeTrait;
+
+class ScopeEntity implements ScopeEntityInterface
+{
+    use ScopeTrait;
+
+    /**
+     * @param non-empty-string $identifier
+     */
+    public function __construct(
+        private string $identifier,
+    ) {}
+
+    /**
+     * @return non-empty-string
+     */
+    public function getIdentifier(): string
+    {
+        return $this->identifier;
+    }
+}

application/Espo/Tools/OAuthServer/League/Entities/UserEntity.php

@@ -0,0 +1,55 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Entities;
+
+use Espo\Entities\User;
+use League\OAuth2\Server\Entities\UserEntityInterface;
+use LogicException;
+
+class UserEntity implements UserEntityInterface
+{
+    public function __construct(
+        private User $user,
+    ) {
+        if ($user->isSystem()) {
+            // Extra safety measure.
+            throw new LogicException();
+        }
+    }
+
+    /**
+     * @return non-empty-string
+     */
+    public function getIdentifier(): string
+    {
+        /** @var non-empty-string */
+        return $this->user->getId();
+    }
+}

application/Espo/Tools/OAuthServer/League/Repositories/AccessTokenRepository.php

@@ -0,0 +1,124 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Repositories;
+
+use Espo\Core\Field\Link;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\League\Entities\AccessTokenEntity;
+use Espo\Tools\OAuthServer\League\Entities\ClientEntity;
+use Espo\Tools\OAuthServer\Repository\AccessTokenRepository as Repository;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use InvalidArgumentException;
+use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use League\OAuth2\Server\Entities\ScopeEntityInterface;
+use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
+use SensitiveParameter;
+
+class AccessTokenRepository implements AccessTokenRepositoryInterface
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private Repository $repository,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    /**
+     * @param ScopeEntityInterface[] $scopes
+     */
+    public function getNewToken(
+        ClientEntityInterface $clientEntity,
+        array $scopes,
+        ?string $userIdentifier = null,
+    ): AccessTokenEntityInterface {
+
+        $entity = $this->entityManager->getRDBRepositoryByClass(AccessToken::class)->getNew();
+
+        /** @noinspection PhpConditionAlreadyCheckedInspection */
+        if (!$clientEntity instanceof ClientEntity) {
+            throw new InvalidArgumentException("Bad client.");
+        }
+
+        if (!$userIdentifier) {
+            throw new InvalidArgumentException('No user ID.');
+        }
+
+        $entity->setClient(Link::create($clientEntity->entityId));
+
+        $accessToken = new AccessTokenEntity($entity, $this->hasher);
+
+        foreach ($scopes as $scope) {
+            $accessToken->addScope($scope);
+        }
+
+        $accessToken->setUserIdentifier($userIdentifier);
+
+        return $accessToken;
+    }
+
+    public function persistNewAccessToken(AccessTokenEntityInterface $accessTokenEntity): void
+    {
+        /** @noinspection PhpConditionAlreadyCheckedInspection */
+        if (!$accessTokenEntity instanceof AccessTokenEntity) {
+            throw new InvalidArgumentException("Not supported access token entity.");
+        }
+
+        $this->entityManager->saveEntity($accessTokenEntity->getEntity());
+    }
+
+    public function revokeAccessToken(#[SensitiveParameter] string $tokenId): void
+    {
+        $entity = $this->repository->getActiveByIdentifier($tokenId);
+
+        if (!$entity || $entity->isRevoked()) {
+            return;
+        }
+
+        $entity->setRevoked();
+
+        $this->entityManager->saveEntity($entity);
+    }
+
+    /**
+     * Not existent or inactive token is treated as revoked intentionally.
+     */
+    public function isAccessTokenRevoked(#[SensitiveParameter] string $tokenId): bool
+    {
+        $entity = $this->repository->getActiveByIdentifier($tokenId);
+
+        if (!$entity) {
+            return true;
+        }
+
+        // Intentionally.
+        return !$entity->isActive();
+    }
+}

application/Espo/Tools/OAuthServer/League/Repositories/AuthCodeRepository.php

@@ -0,0 +1,119 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Repositories;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\League\Entities\AuthCodeEntity;
+use Espo\Tools\OAuthServer\Repository\AuthorizationCodeRepository;
+use Espo\Tools\OAuthServer\Repository\ClientRepository as ClientRepository;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use InvalidArgumentException;
+use League\OAuth2\Server\Entities\AuthCodeEntityInterface;
+use League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface;
+use RuntimeException;
+use SensitiveParameter;
+
+class AuthCodeRepository implements AuthCodeRepositoryInterface
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private AuthorizationCodeRepository $repository,
+        private ClientRepository $clientRepository,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function getNewAuthCode(): AuthCodeEntity
+    {
+        return new AuthCodeEntity();
+    }
+
+    public function persistNewAuthCode(AuthCodeEntityInterface $authCodeEntity): void
+    {
+        $entity = $this->entityManager->getRDBRepositoryByClass(AuthorizationCode::class)->getNew();
+
+        $userId = $authCodeEntity->getUserIdentifier();
+
+        if (!is_string($userId)) {
+            throw new InvalidArgumentException("User ID must be string.");
+        }
+
+        $scopes = array_map(fn ($scope) => $scope->getIdentifier(), $authCodeEntity->getScopes());
+
+        $redirectUri = $authCodeEntity->getRedirectUri() ?? throw new InvalidArgumentException("No redirect URI");
+
+        $clientId = $authCodeEntity->getClient()->getIdentifier();
+
+        $client = $this->clientRepository->getActiveByIdentifier($clientId);
+
+        if (!$client) {
+            throw new RuntimeException("Client not found.");
+        }
+
+        $hash = $this->hasher->hash($authCodeEntity->getIdentifier());
+
+        $entity
+            ->setClient($client)
+            ->setHash($hash)
+            ->setUser(Link::create($userId))
+            ->setScopes($scopes)
+            ->setRedirectUri($redirectUri)
+            ->setExpiresAt(DateTime::fromDateTime($authCodeEntity->getExpiryDateTime()));
+
+        $this->entityManager->saveEntity($entity);
+    }
+
+    public function revokeAuthCode(#[SensitiveParameter] string $codeId): void
+    {
+        $code = $this->repository->getActiveByIdentifier($codeId);
+
+        if (!$code || $code->isRevoked()) {
+            return;
+        }
+
+        $code->setRevoked();
+
+        $this->entityManager->saveEntity($code);
+    }
+
+    public function isAuthCodeRevoked(#[SensitiveParameter] string $codeId): bool
+    {
+        $entity = $this->repository->getActiveByIdentifier($codeId);
+
+        if (!$entity) {
+            return true;
+        }
+
+        // Intentionally.
+        return !$entity->isActive();
+    }
+}

application/Espo/Tools/OAuthServer/League/Repositories/ClientRepository.php

@@ -0,0 +1,70 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Repositories;
+
+use Espo\Tools\OAuthServer\ClientValidator;
+use Espo\Tools\OAuthServer\League\Entities\ClientEntity;
+use Espo\Tools\OAuthServer\Repository\ClientRepository as Repository;
+use League\OAuth2\Server\Repositories\ClientRepositoryInterface;
+use SensitiveParameter;
+
+class ClientRepository implements ClientRepositoryInterface
+{
+    public function __construct(
+        private Repository $repository,
+        private ClientValidator $clientValidator,
+    ) {}
+
+    public function getClientEntity(string $clientIdentifier): ?ClientEntity
+    {
+        $client = $this->repository->getActiveByIdentifier($clientIdentifier);
+
+        if (!$client) {
+            return null;
+        }
+
+        return ClientEntity::fromEntity($client);
+    }
+
+    public function validateClient(
+        string $clientIdentifier,
+        #[SensitiveParameter] ?string $clientSecret,
+        ?string $grantType,
+    ): bool {
+
+        $client = $this->repository->getActiveByIdentifier($clientIdentifier);
+
+        if (!$client) {
+            return false;
+        }
+
+        return $this->clientValidator->validate($client, $clientSecret);
+    }
+}

application/Espo/Tools/OAuthServer/League/Repositories/RefreshTokenRepository.php

@@ -0,0 +1,122 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Repositories;
+
+use Espo\Core\Field\DateTime;
+use Espo\Core\Field\Link;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+use Espo\Tools\OAuthServer\League\Entities\AccessTokenEntity;
+use Espo\Tools\OAuthServer\League\Entities\RefreshTokenEntity;
+use Espo\Tools\OAuthServer\Repository\ClientRepository as ClientRepositoryInternal;
+use Espo\Tools\OAuthServer\Repository\RefreshTokenRepository as RefreshTokenRepositoryInternal;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use InvalidArgumentException;
+use League\OAuth2\Server\Entities\RefreshTokenEntityInterface;
+use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
+use RuntimeException;
+use SensitiveParameter;
+
+class RefreshTokenRepository implements RefreshTokenRepositoryInterface
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private RefreshTokenRepositoryInternal $repository,
+        private ClientRepositoryInternal $clientRepository,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function getNewRefreshToken(): RefreshTokenEntity
+    {
+        return new RefreshTokenEntity();
+    }
+
+    public function persistNewRefreshToken(RefreshTokenEntityInterface $refreshTokenEntity): void
+    {
+        $entity = $this->entityManager->getRDBRepositoryByClass(RefreshToken::class)->getNew();
+
+        $userId = $refreshTokenEntity->getAccessToken()->getUserIdentifier();
+
+        if (!is_string($userId)) {
+            throw new InvalidArgumentException("User ID must be string.");
+        }
+
+        $clientId = $refreshTokenEntity->getAccessToken()->getClient()->getIdentifier();
+
+        $client = $this->clientRepository->getActiveByIdentifier($clientId) ??
+            throw new RuntimeException("Client not found.");
+
+        $accessToken = $refreshTokenEntity->getAccessToken();
+
+        /** @noinspection PhpConditionAlreadyCheckedInspection */
+        if (!$accessToken instanceof AccessTokenEntity) {
+            throw new InvalidArgumentException("Not supported access token implementation.");
+        }
+
+        $hash = $this->hasher->hash($refreshTokenEntity->getIdentifier());
+
+        $entity
+            ->setClient($client)
+            ->setAccessToken($accessToken->getEntity())
+            ->setHash($hash)
+            ->setUser(Link::create($userId))
+            ->setExpiresAt(DateTime::fromDateTime($refreshTokenEntity->getExpiryDateTime()));
+
+        $this->entityManager->saveEntity($entity);
+    }
+
+    /**
+     * @todo Delay?
+     */
+    public function revokeRefreshToken(#[SensitiveParameter] string $tokenId): void
+    {
+        $token = $this->repository->getActiveByIdentifier($tokenId);
+
+        if (!$token || $token->isRevoked()) {
+            return;
+        }
+
+        $token->setRevoked();
+
+        $this->entityManager->saveEntity($token);
+    }
+
+    public function isRefreshTokenRevoked(#[SensitiveParameter] string $tokenId): bool
+    {
+        $entity = $this->repository->getActiveByIdentifier($tokenId);
+
+        if (!$entity) {
+            return true;
+        }
+
+        // Intentionally.
+        return !$entity->isActive();
+    }
+}

application/Espo/Tools/OAuthServer/League/Repositories/ScopeRepository.php

@@ -0,0 +1,82 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\League\Repositories;
+
+use Espo\Tools\OAuthServer\League\Entities\ScopeEntity;
+use Espo\Tools\OAuthServer\Scope\UserAvailableScopesFilter;
+use Espo\Tools\OAuthServer\Scope\ScopeValidator;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
+use League\OAuth2\Server\Repositories\ScopeRepositoryInterface;
+
+class ScopeRepository implements ScopeRepositoryInterface
+{
+    public function __construct(
+        private ScopeValidator $scopeValidator,
+        private UserAvailableScopesFilter $userAvailableScopesProvider,
+    ) {}
+
+    /**
+     * @param non-empty-string $identifier
+     */
+    public function getScopeEntityByIdentifier(string $identifier): ?ScopeEntity
+    {
+        if (!$this->scopeValidator->validate($identifier)) {
+            return null;
+        }
+
+        return new ScopeEntity($identifier);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function finalizeScopes(
+        array $scopes,
+        ?string $grantType,
+        ClientEntityInterface $clientEntity,
+        ?string $userIdentifier = null,
+        ?string $authCodeId = null,
+    ): array {
+
+        if (!$userIdentifier) {
+            return $scopes;
+        }
+
+        $ids = array_map(fn ($it) => $it->getIdentifier(), $scopes);
+
+        $availableIds = $this->userAvailableScopesProvider->filter($userIdentifier, $ids);
+
+        $scopes = array_filter($scopes, function ($scope) use ($availableIds) {
+            return in_array($scope->getIdentifier(), $availableIds);
+        });
+
+        return array_values($scopes);
+    }
+}

application/Espo/Tools/OAuthServer/Login/OAuthLogin.php

@@ -0,0 +1,116 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Login;
+
+use Espo\Core\Api\Request;
+use Espo\Core\Authentication\Login;
+use Espo\Core\Authentication\Login\Data;
+use Espo\Core\Authentication\Repository\UserRepository;
+use Espo\Core\Authentication\Result;
+use Espo\Core\Field\DateTime;
+use Espo\Core\Utils\DateTime\Clock;
+use Espo\Tools\OAuthServer\Repository\AccessTokenRepository;
+use Espo\Tools\OAuthServer\Utils\ErrorResponseComposer;
+
+/**
+ * @noinspection PhpUnused
+ */
+class OAuthLogin implements Login
+{
+    private const string HEADER_AUTHORIZATION = 'Authorization';
+    private const string SCHEME = 'Bearer';
+
+    public function __construct(
+        private AccessTokenRepository $repository,
+        private Clock $clock,
+        private UserRepository $userRepository,
+    ) {}
+
+    public function login(Data $data, Request $request): Result
+    {
+        $header = $request->getHeader(self::HEADER_AUTHORIZATION);
+
+        $prefix = self::SCHEME . ' ';
+
+        if (!$header || !str_starts_with($header, $prefix)) {
+            return Result::fail(Result\FailReason::ERROR);
+        }
+
+        $opaqueToken = substr($header, strlen($prefix));
+
+        $accessToken = $this->repository->getActiveByIdentifier($opaqueToken);
+
+        if (!$accessToken) {
+            $response = ErrorResponseComposer::compose(
+                error: 'access_denied',
+                errorDescription: 'Invalid access token.',
+            );
+
+            return Result::fail(Result\FailReason::WRONG_CREDENTIALS, $response);
+        }
+
+        $now = DateTime::fromDateTime($this->clock->now());
+
+        if ($accessToken->getExpiresAt()->isLessThanOrEqualTo($now)) {
+            $response = ErrorResponseComposer::compose(
+                error: 'access_denied',
+                errorDescription: 'The access token expired.',
+            );
+
+            return Result::fail(Result\FailReason::DENIED, $response);
+        }
+
+        if (!$accessToken->getClient()->isActive()) {
+            $response = ErrorResponseComposer::compose(
+                error: 'access_denied',
+                errorDescription: 'The client is not active.',
+            );
+
+            return Result::fail(Result\FailReason::DENIED, $response);
+        }
+
+        $userLink = $accessToken->getUser();
+
+        $user = $this->userRepository->findOneById($userLink->getId());
+
+        if (!$user) {
+            $response = ErrorResponseComposer::compose(
+                error: 'access_denied',
+                errorDescription: 'User not found.',
+            );
+
+            return Result::fail(Result\FailReason::DENIED, $response);
+        }
+
+        $user->setScopes($accessToken->getScopes());
+
+        return Result::success($user);
+    }
+}

application/Espo/Tools/OAuthServer/Metadata/AuthorizationServerMetadataProvider.php

@@ -0,0 +1,78 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Metadata;
+
+use Espo\Core\Utils\Cache\DataCacheAccess;
+use Espo\Core\Utils\Config\ApplicationConfig;
+use stdClass;
+
+class AuthorizationServerMetadataProvider
+{
+    private const string CACHE_KEY = 'oAuthServer/authorizationServerMetadata';
+
+    /**
+     * @param DataCacheAccess<stdClass> $dataCacheAccess
+     */
+    public function __construct(
+        private DataCacheAccess $dataCacheAccess,
+        private ApplicationConfig $applicationConfig,
+    ) {
+        $this->dataCacheAccess->init(
+            key: self::CACHE_KEY,
+            loader: fn () => $this->buildData(),
+        );
+    }
+
+    public function get(): stdClass
+    {
+        return $this->dataCacheAccess->get();
+    }
+
+    private function buildData(): stdClass
+    {
+        return (object) [
+            'issuer' => self::serverIdentifierFromUrl($this->applicationConfig->getSiteUrl()),
+            'authorization_endpoint' => $this->applicationConfig->getSiteUrl() . '/oauth/authorize',
+            'token_endpoint' => $this->applicationConfig->getSiteUrl() . '/oauth/token',
+            'revocation_endpoint' => $this->applicationConfig->getSiteUrl() . '/oauth/token/revoke',
+        ];
+    }
+
+    private static function serverIdentifierFromUrl(string $url): string
+    {
+        $parsed = parse_url($url);
+
+        $scheme = isset($parsed['scheme']) ? $parsed['scheme'] . '://' : '';
+        $host = $parsed['host'] ?? '';
+        $port = isset($parsed['port']) ? ':' . $parsed['port'] : '';
+
+        return $scheme . $host . $port;
+    }
+}

application/Espo/Tools/OAuthServer/Metadata/ProtectedResourceMetadataProvider.php

@@ -0,0 +1,81 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Metadata;
+
+use Espo\Core\Utils\Cache\DataCacheAccess;
+use Espo\Core\Utils\Config\ApplicationConfig;
+use stdClass;
+
+class ProtectedResourceMetadataProvider
+{
+    private const string CACHE_KEY = 'oAuthServer/protectedResourceMetadata';
+
+    /**
+     * @param DataCacheAccess<stdClass> $dataCacheAccess
+     */
+    public function __construct(
+        private DataCacheAccess $dataCacheAccess,
+        private ApplicationConfig $applicationConfig,
+    ) {
+        $this->dataCacheAccess->init(
+            key: self::CACHE_KEY,
+            loader: fn () => $this->buildData(),
+        );
+    }
+
+    public function get(): stdClass
+    {
+        return $this->dataCacheAccess->get();
+    }
+
+    private function buildData(): stdClass
+    {
+        return (object) [
+            'resource' => $this->applicationConfig->getSiteUrl(),
+            'authorization_servers' => [
+                self::serverIdentifierFromUrl($this->applicationConfig->getSiteUrl()),
+            ],
+            'bearer_methods_supported' => [
+                'header',
+            ],
+        ];
+    }
+
+    private static function serverIdentifierFromUrl(string $url): string
+    {
+        $parsed = parse_url($url);
+
+        $scheme = isset($parsed['scheme']) ? $parsed['scheme'] . '://' : '';
+        $host = $parsed['host'] ?? '';
+        $port = isset($parsed['port']) ? ':' . $parsed['port'] : '';
+
+        return $scheme . $host . $port;
+    }
+}

application/Espo/Tools/OAuthServer/Record/MassActions/RevokeMassAction.php

@@ -0,0 +1,136 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Record\MassActions;
+
+use Espo\Core\Acl;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Exceptions\Conflict;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\MassAction\Data;
+use Espo\Core\MassAction\MassAction;
+use Espo\Core\MassAction\Params;
+use Espo\Core\MassAction\QueryBuilder;
+use Espo\Core\MassAction\Result;
+use Espo\Entities\User;
+use Espo\ORM\Entity;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+use Espo\Tools\OAuthServer\Record\TokenService;
+use RuntimeException;
+
+/**
+ * @noinspection PhpUnused
+ */
+class RevokeMassAction implements MassAction
+{
+    /**
+     * @var string[]
+     */
+    private array $entityTypes = [
+        AccessToken::ENTITY_TYPE,
+        RefreshToken::ENTITY_TYPE,
+        AuthorizationCode::ENTITY_TYPE,
+    ];
+
+    public function __construct(
+        private TokenService $service,
+        private User $user,
+        private QueryBuilder $queryBuilder,
+        private Acl $acl,
+        private EntityManager $entityManager,
+    ) {}
+
+    public function process(Params $params, Data $data): Result
+    {
+        $entityType = $params->getEntityType();
+
+        if (!in_array($entityType, $this->entityTypes)) {
+            throw new BadRequest();
+        }
+
+        $this->assertAccess($entityType);
+
+        $query = $this->queryBuilder->build($params);
+
+        $collection = $this->entityManager->getRDBRepository($entityType)
+            ->clone($query)
+            ->sth()
+            ->find();
+
+        $ids = [];
+        $count = 0;
+
+        foreach ($collection as $entity) {
+            try {
+                $this->assertEntity($entity);
+
+                /** @noinspection PhpParamsInspection */
+                $this->service->revoke($entity);
+
+                $ids[] = $entity->getId();
+                $count ++;
+            } catch (Conflict|Forbidden) {
+                continue;
+            }
+        }
+
+        return new Result($count, $ids);
+    }
+
+    /**
+     * @throws Forbidden
+     */
+    private function assertAccess(string $entityType): void
+    {
+        if (!$this->user->isEffectiveAdmin()) {
+            throw new Forbidden();
+        }
+
+        if (!$this->acl->check($entityType, Acl\Table::ACTION_EDIT)) {
+            throw new Forbidden("No edit access.");
+        }
+    }
+
+    /**
+     * @phpstan-assert AccessToken|RefreshToken|AuthorizationCode $entity
+     */
+    private function assertEntity(Entity $entity): void
+    {
+        if (
+            !$entity instanceof AccessToken &&
+            !$entity instanceof RefreshToken &&
+            !$entity instanceof AuthorizationCode
+        ) {
+            throw new RuntimeException();
+        }
+    }
+}

application/Espo/Tools/OAuthServer/Record/TokenService.php

@@ -0,0 +1,65 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Record;
+
+use Espo\Core\Acl;
+use Espo\Core\Exceptions\Conflict;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+
+class TokenService
+{
+    public function __construct(
+        private Acl $acl,
+        private EntityManager $entityManager,
+    ) {}
+
+    /**
+     * @throws Forbidden
+     * @throws Conflict
+     */
+    public function revoke(AccessToken|RefreshToken|AuthorizationCode $token): void
+    {
+        if (!$this->acl->checkEntityEdit($token)) {
+            throw new Forbidden("No edit access.");
+        }
+
+        if (!$token->isActive()) {
+            throw new Conflict("Token is not active.");
+        }
+
+        $token->setRevoked();
+
+        $this->entityManager->saveEntity($token);
+    }
+}

application/Espo/Tools/OAuthServer/Repository/AccessTokenRepository.php

@@ -0,0 +1,84 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Repository;
+
+use Espo\ORM\SthCollection;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use SensitiveParameter;
+
+class AccessTokenRepository
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function getActiveByIdentifier(#[SensitiveParameter] string $identifier): ?AccessToken
+    {
+        $hash = $this->hasher->hash($identifier);
+
+        return $this->entityManager
+            ->getRDBRepositoryByClass(AccessToken::class)
+            ->where([
+                AccessToken::FIELD_HASH => $hash,
+                AccessToken::FIELD_STATUS => AccessToken::STATUS_ACTIVE,
+            ])
+            ->findOne();
+    }
+
+    public function getByIdentifier(#[SensitiveParameter] string $identifier): ?AccessToken
+    {
+        $hash = $this->hasher->hash($identifier);
+
+        return $this->entityManager
+            ->getRDBRepositoryByClass(AccessToken::class)
+            ->where([
+                AccessToken::FIELD_HASH => $hash,
+            ])
+            ->findOne();
+    }
+
+    /**
+     * @return SthCollection<AccessToken>
+     */
+    public function findActiveForClientIdAndUser(string $clientId, string $userId): SthCollection
+    {
+        return $this->entityManager->getRDBRepositoryByClass(AccessToken::class)
+            ->where([
+                AccessToken::FIELD_STATUS => AccessToken::STATUS_ACTIVE,
+                AccessToken::FIELD_CLIENT . 'Id' => $clientId,
+                AccessToken::FIELD_USER . 'Id' => $userId,
+            ])
+            ->sth()
+            ->find();
+    }
+}

application/Espo/Tools/OAuthServer/Repository/AuthorizationCodeRepository.php

@@ -0,0 +1,56 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Repository;
+
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\AuthorizationCode;
+use SensitiveParameter;
+
+class AuthorizationCodeRepository
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function getActiveByIdentifier(#[SensitiveParameter] string $identifier): ?AuthorizationCode
+    {
+        $hash = $this->hasher->hash($identifier);
+
+        return $this->entityManager
+            ->getRDBRepositoryByClass(AuthorizationCode::class)
+            ->where([
+                AuthorizationCode::FIELD_HASH => $hash,
+                AuthorizationCode::FIELD_STATUS => AuthorizationCode::STATUS_ACTIVE,
+            ])
+            ->findOne();
+    }
+}

application/Espo/Tools/OAuthServer/Repository/ClientRepository.php

@@ -0,0 +1,109 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Repository;
+
+use Espo\Core\Name\Field;
+use Espo\ORM\EntityCollection;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Name\Attribute;
+use Espo\ORM\Query\Part\Condition as Cond;
+use Espo\ORM\Query\Part\Expression as Expr;
+use Espo\ORM\Query\SelectBuilder;
+use Espo\Tools\OAuthServer\Entities\AccessToken;
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+
+class ClientRepository
+{
+    public function __construct(
+        private EntityManager $entityManager,
+    ) {}
+
+    public function getActiveByIdentifier(string $identifier): ?Client
+    {
+        return $this->entityManager
+            ->getRDBRepositoryByClass(Client::class)
+            ->where([
+                Client::FIELD_IDENTIFIER => $identifier,
+                Client::FIELD_STATUS => Client::STATUS_ACTIVE,
+            ])
+            ->findOne();
+    }
+
+    public function getByIdentifier(string $identifier): ?Client
+    {
+        return $this->entityManager
+            ->getRDBRepositoryByClass(Client::class)
+            ->where([
+                Client::FIELD_IDENTIFIER => $identifier,
+            ])
+            ->findOne();
+    }
+
+    /**
+     * @return EntityCollection<Client>
+     */
+    public function findConnectedForUser(string $userId, int $limit): EntityCollection
+    {
+        return $this->entityManager->getRDBRepositoryByClass(Client::class)
+            ->where(
+                Cond::or(
+                    Cond::in(
+                        Expr::column(Attribute::ID),
+                        SelectBuilder::create()
+                            ->from(RefreshToken::ENTITY_TYPE)
+                            ->select([RefreshToken::FIELD_CLIENT . 'Id'])
+                            ->where([
+                                RefreshToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+                                RefreshToken::FIELD_USER . 'Id' => $userId,
+                            ])
+                            ->build()
+                    ),
+                    Cond::in(
+                        Expr::column(Attribute::ID),
+                        SelectBuilder::create()
+                            ->from(AccessToken::ENTITY_TYPE)
+                            ->select([RefreshToken::FIELD_CLIENT . 'Id'])
+                            ->where([
+                                AccessToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+                                AccessToken::FIELD_USER . 'Id' => $userId,
+                            ])
+                            ->build()
+                    ),
+                )
+            )
+            ->where([
+                Client::FIELD_IDENTIFIER . '!=' => null,
+            ])
+            ->order(Field::NAME)
+            ->limit(0, $limit)
+            ->find();
+    }
+}

application/Espo/Tools/OAuthServer/Repository/RefreshTokenRepository.php

@@ -0,0 +1,72 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Repository;
+
+use Espo\ORM\SthCollection;
+use Espo\Tools\OAuthServer\Utils\IdentifierHasher;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\Entities\RefreshToken;
+use SensitiveParameter;
+
+class RefreshTokenRepository
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private IdentifierHasher $hasher,
+    ) {}
+
+    public function getActiveByIdentifier(#[SensitiveParameter] string $identifier): ?RefreshToken
+    {
+        $hash = $this->hasher->hash($identifier);
+
+        return $this->entityManager
+            ->getRDBRepositoryByClass(RefreshToken::class)
+            ->where([
+                RefreshToken::FIELD_HASH => $hash,
+                RefreshToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+            ])
+            ->findOne();
+    }
+
+    /**
+     * @return SthCollection<RefreshToken>
+     */
+    public function findActiveForClientIdAndUser(string $clientId, string $userId): SthCollection
+    {
+        return $this->entityManager->getRDBRepositoryByClass(RefreshToken::class)
+            ->where([
+                RefreshToken::FIELD_STATUS => RefreshToken::STATUS_ACTIVE,
+                RefreshToken::FIELD_CLIENT . 'Id' => $clientId,
+                RefreshToken::FIELD_USER . 'Id' => $userId,
+            ])
+            ->sth()
+            ->find();
+    }
+}

application/Espo/Tools/OAuthServer/Revoke/Data.php

@@ -0,0 +1,43 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Revoke;
+
+use SensitiveParameter;
+
+readonly class Data
+{
+    public function __construct(
+        public string $clientId,
+        #[SensitiveParameter]
+        public ?string $clientSecret,
+        public string $token,
+        public ?string $tokenTypeHint,
+    ) {}
+}

application/Espo/Tools/OAuthServer/Revoke/TokenRevokeService.php

@@ -0,0 +1,125 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Revoke;
+
+use Espo\Core\Exceptions\Unauthorized;
+use Espo\ORM\EntityManager;
+use Espo\Tools\OAuthServer\ClientValidator;
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\Repository\AccessTokenRepository;
+use Espo\Tools\OAuthServer\Repository\ClientRepository;
+use Espo\Tools\OAuthServer\Repository\RefreshTokenRepository;
+use Espo\Tools\OAuthServer\Utils\RefreshTokenDataExtractor;
+use Exception;
+use SensitiveParameter;
+
+class TokenRevokeService
+{
+    public const string TYPE_ACCESS_TOKEN = 'access_token';
+    public const string TYPE_REFRESH_TOKEN = 'refresh_token';
+
+    public function __construct(
+        private AccessTokenRepository $accessTokenRepository,
+        private RefreshTokenRepository $refreshTokenRepository,
+        private ClientRepository $clientRepository,
+        private ClientValidator $clientValidator,
+        private EntityManager $entityManager,
+        private RefreshTokenDataExtractor $refreshTokenDataExtractor,
+    ) {}
+
+    /**
+     * @throws Unauthorized
+     */
+    public function revoke(#[SensitiveParameter] Data $data): void
+    {
+        $tokenTypeHint = $data->tokenTypeHint;
+        $token = $data->token;
+
+        $client = $this->clientRepository->getActiveByIdentifier($data->clientId);
+
+        if (!$client || !$this->clientValidator->validate($client, $data->clientSecret)) {
+            throw new Unauthorized();
+        }
+
+        if (!$tokenTypeHint || $tokenTypeHint === self::TYPE_ACCESS_TOKEN) {
+            $this->revokeAccessToken($token, $client);
+        }
+
+        if (!$tokenTypeHint || $tokenTypeHint === self::TYPE_REFRESH_TOKEN) {
+            $this->revokeRefreshToken($token, $client);
+        }
+    }
+
+    private function revokeAccessToken(#[SensitiveParameter] string $token, Client $client): void
+    {
+        $accessToken = $this->accessTokenRepository->getActiveByIdentifier($token);
+
+        if (
+            !$accessToken ||
+            $accessToken->getClient()->getId() !== $client->getId()
+        ) {
+            return;
+        }
+
+        $accessToken->setRevoked();
+
+        $this->entityManager->saveEntity($accessToken);
+    }
+
+    private function revokeRefreshToken(#[SensitiveParameter] string $token, Client $client): void
+    {
+        try {
+            $identifier = $this->refreshTokenDataExtractor->extractIdentifier($token);
+        } catch (Exception) {
+            return;
+        }
+
+        $refreshToken = $this->refreshTokenRepository->getActiveByIdentifier($identifier);
+
+        if (
+            !$refreshToken ||
+            $refreshToken->getClient()->getId() !== $client->getId()
+        ) {
+            return;
+        }
+
+        $accessToken = $refreshToken->getAccessToken();
+
+        $refreshToken->setRevoked();
+
+        $this->entityManager->saveEntity($refreshToken);
+
+        if ($accessToken) {
+            $accessToken->setRevoked();
+
+            $this->entityManager->saveEntity($accessToken);
+        }
+    }
+}

application/Espo/Tools/OAuthServer/Scope/ScopeSorter.php

@@ -0,0 +1,76 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Scope;
+
+use Espo\Core\Acl\Scope;
+use stdClass;
+
+class ScopeSorter
+{
+    /**
+     * @var array<string, int>
+     */
+    private array $priority = [
+        Scope::GLOBAL => 0,
+        Scope::ADMIN => 1,
+    ];
+
+    /**
+     * @param (stdClass & object{name: string, label: string})[] $items
+     * @return (stdClass & object{name: string, label: string})[]
+     */
+    public function sortDataItems(array $items): array
+    {
+        usort($items, function ($a, $b) {
+            $aPriority = $this->priority[$a->name] ?? PHP_INT_MAX;
+            $bPriority = $this->priority[$b->name] ?? PHP_INT_MAX;
+
+            return $aPriority <=> $bPriority ?: strcasecmp($a->label, $b->label);
+        });
+
+        return $items;
+    }
+
+    /**
+     * @param non-empty-string[] $scopes
+     * @return non-empty-string[]
+     */
+    public function sort(array $scopes): array
+    {
+        usort($scopes, function ($a, $b) {
+            $aPriority = $this->priority[$a] ?? PHP_INT_MAX;
+            $bPriority = $this->priority[$b] ?? PHP_INT_MAX;
+
+            return $aPriority <=> $bPriority ?: strcmp($a, $b);
+        });
+
+        return $scopes;
+    }
+}

application/Espo/Tools/OAuthServer/Scope/ScopeValidator.php

@@ -0,0 +1,42 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Scope;
+
+class ScopeValidator
+{
+    public function __construct(
+        private ScopesProvider $scopesProvider,
+    ) {}
+
+    public function validate(string $scope): bool
+    {
+        return in_array($scope, $this->scopesProvider->get());
+    }
+}

application/Espo/Tools/OAuthServer/Scope/ScopesProvider.php

@@ -0,0 +1,94 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Scope;
+
+use Espo\Core\Acl\Scope;
+use Espo\Core\Utils\Metadata;
+
+/**
+ * @since 10.1.0
+ */
+class ScopesProvider
+{
+    /**
+     * @var string[]
+     */
+    private array $commonScopes = [
+        Scope::ADMIN,
+        Scope::GLOBAL,
+    ];
+
+    public function __construct(
+        private Metadata $metadata,
+    ) {}
+
+    /**
+     * @return string[]
+     */
+    public function get(): array
+    {
+        return [
+            ...$this->commonScopes,
+            ...$this->getAclScopes(),
+        ];
+    }
+
+    /**
+     * @return string[]
+     */
+    private function getAclScopes(): array
+    {
+        /**
+         * @var array<string, array{
+         *     disabled?: bool,
+         *     acl?: mixed,
+         * }> $scopesDefs
+         */
+        $scopesDefs = $this->metadata->get("scopes", []);
+
+        $list = [];
+
+        foreach ($scopesDefs as $scope => $defs) {
+            if (
+                ($defs['disabled'] ?? false) ||
+                !($defs['acl'] ?? false) ||
+                in_array($scope, $this->commonScopes)
+            ) {
+                continue;
+            }
+
+            $list[] = $scope;
+        }
+
+        sort($list);
+
+        return $list;
+    }
+}

application/Espo/Tools/OAuthServer/Scope/UserAvailableScopesFilter.php

@@ -0,0 +1,68 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Scope;
+
+use Espo\Core\Acl\Scope;
+use Espo\Core\Utils\Acl\UserAclManagerProvider;
+use Espo\Entities\User;
+use Espo\ORM\EntityManager;
+
+class UserAvailableScopesFilter
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private UserAclManagerProvider $aclManagerProvider,
+    ) {}
+
+    /**
+     * @param string[] $scopes
+     * @return string[]
+     */
+    public function filter(string $userId, array $scopes): array
+    {
+        $user = $this->entityManager->getRDBRepositoryByClass(User::class)->getById($userId);
+
+        if (!$user) {
+            return [];
+        }
+
+        $aclManager = $this->aclManagerProvider->get($user);
+
+        $scopes = array_filter($scopes, function ($scope) use ($aclManager, $user) {
+            if ($scope === Scope::GLOBAL) {
+                return true;
+            }
+
+            return $aclManager->tryCheck($user, $scope);
+        });
+
+        return array_values($scopes);
+    }
+}

application/Espo/Tools/OAuthServer/Secret/SecretValidator.php

@@ -0,0 +1,79 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Secret;
+
+use Espo\Core\Name\Field;
+use Espo\Core\Utils\DateTime;
+use Espo\Core\Utils\PasswordHash;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\Part\Order;
+use Espo\Tools\OAuthServer\Entities\Client;
+use Espo\Tools\OAuthServer\Entities\ClientSecret;
+use SensitiveParameter;
+
+class SecretValidator
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private DateTime $dateTime,
+        private PasswordHash $passwordHash,
+    ) {}
+
+    public function validate(Client $client, #[SensitiveParameter] string $secret): bool
+    {
+        $secrets = $this->entityManager
+            ->getRDBRepositoryByClass(ClientSecret::class)
+            ->sth()
+            ->where([
+                ClientSecret::ATTR_CLIENT_ID => $client->getId(),
+                ClientSecret::FIELD_STATUS => ClientSecret::STATUS_ACTIVE,
+            ])
+            ->order(Field::CREATED_AT, Order::DESC)
+            ->find();
+
+        foreach ($secrets as $entry) {
+            /** @noinspection PhpParamsInspection */
+            if ($this->match($entry, $secret)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function match(ClientSecret $entry, #[SensitiveParameter] string $secret): bool
+    {
+        if ($entry->getExpirationDate()?->isLessThanOrEqualTo($this->dateTime->getToday())) {
+            return false;
+        }
+
+        return $this->passwordHash->verify($secret, $entry->getHash());
+    }
+}

application/Espo/Tools/OAuthServer/Utils/Crypt.php

@@ -0,0 +1,54 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+use Defuse\Crypto\Crypto;
+use Defuse\Crypto\Exception\EnvironmentIsBrokenException;
+use Defuse\Crypto\Exception\WrongKeyOrModifiedCiphertextException;
+use RuntimeException;
+use SensitiveParameter;
+
+class Crypt
+{
+    public function __construct(
+        private CryptKeyProvider $keyProvider,
+    ) {}
+
+    public function decrypt(#[SensitiveParameter] string $value): string
+    {
+        $key = $this->keyProvider->getCryptKey();
+
+        try {
+            return Crypto::decryptWithPassword($value, $key);
+        } catch (EnvironmentIsBrokenException|WrongKeyOrModifiedCiphertextException $e) {
+            throw new RuntimeException(previous: $e);
+        }
+    }
+}

application/Espo/Tools/OAuthServer/Utils/CryptKeyProvider.php

@@ -0,0 +1,65 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+use Espo\Core\Utils\Config;
+use Random\RandomException;
+use RuntimeException;
+
+class CryptKeyProvider
+{
+    private const string PARAM_CRYPT_KEY = 'oAuthServerCryptKey';
+
+    public function __construct(
+        private Config $config,
+        private Config\ConfigWriter $configWriter,
+    ) {}
+
+    public function getCryptKey(): string
+    {
+        if (!$this->config->has(self::PARAM_CRYPT_KEY)) {
+            $this->configWriter->set(self::PARAM_CRYPT_KEY, $this->generateKey());
+            $this->configWriter->save();
+        }
+
+        return $this->config->get(self::PARAM_CRYPT_KEY) ?? throw new RuntimeException("No crypt key.");
+    }
+
+    private function generateKey(): string
+    {
+        try {
+            $key = bin2hex(random_bytes(32));
+        } catch (RandomException $e) {
+            throw new RuntimeException(previous: $e);
+        }
+
+        return $key;
+    }
+}

application/Espo/Tools/OAuthServer/Utils/ErrorResponseComposer.php

@@ -0,0 +1,61 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+
+class ErrorResponseComposer
+{
+    /**
+     * @param ?int<400, 499> $statusCode
+     */
+    public static function compose(
+        string $error,
+        string $errorDescription,
+        ?int $statusCode = null,
+    ): Response {
+
+        $header = "Bearer error=\"$error\", error_description=\"$errorDescription\"";
+
+        $response = ResponseComposer::json([
+            'error' => $error,
+            'error_description' => $errorDescription,
+        ]);
+
+        if ($statusCode) {
+            $response->setStatus($statusCode);
+        }
+
+        $response->setHeader('WWW-Authenticate', $header);
+
+        return $response;
+    }
+}

application/Espo/Tools/OAuthServer/Utils/IdentifierHasher.php

@@ -0,0 +1,40 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+use SensitiveParameter;
+
+class IdentifierHasher
+{
+    public function hash(#[SensitiveParameter] string $value): string
+    {
+        return hash('sha256', $value);
+    }
+}

application/Espo/Tools/OAuthServer/Utils/RefreshTokenDataExtractor.php

@@ -0,0 +1,66 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+use Espo\Core\Utils\Json;
+use Exception;
+use InvalidArgumentException;
+use JsonException;
+use SensitiveParameter;
+
+class RefreshTokenDataExtractor
+{
+    public function __construct(
+        private Crypt $crypt,
+    ) {}
+
+    public function extractIdentifier(#[SensitiveParameter] string $token): string
+    {
+        try {
+            $decrypted = $this->crypt->decrypt($token);
+        } catch (Exception) {
+            throw new InvalidArgumentException("Could not decrypt.");
+        }
+
+        try {
+            $tokenData = Json::decode($decrypted, true);
+        } catch (JsonException) {
+            throw new InvalidArgumentException("Could not JSON decode.");
+        }
+
+        $identifier = $tokenData['refresh_token_id'] ?? null;
+
+        if (!is_string($identifier)) {
+            throw new InvalidArgumentException("No identifier.");
+        }
+
+        return $identifier;
+    }
+}

application/Espo/Tools/OAuthServer/Utils/UriUtil.php

@@ -0,0 +1,43 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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\OAuthServer\Utils;
+
+/**
+ * @internal
+ */
+class UriUtil
+{
+    public static function makeRedirectUri(string $uri, string $state): string
+    {
+        $uri .= !str_contains($uri, '?') ? '?' : '&';
+
+        return $uri . http_build_query(['state' => $state]);
+    }
+}