Implementation of the backend for the OAuth2 clients management

api/modules/oauth/Module.php

@@ -0,0 +1,10 @@
+<?php
+namespace api\modules\oauth;
+
+use yii\base\Module as BaseModule;
+
+class Module extends BaseModule {
+
+    public $id = 'oauth';
+
+}

api/modules/oauth/controllers/AuthorizationController.php

@@ -0,0 +1,61 @@
+<?php
+namespace api\modules\oauth\controllers;
+
+use api\controllers\Controller;
+use api\modules\oauth\models\OauthProcess;
+use common\rbac\Permissions as P;
+use Yii;
+use yii\filters\AccessControl;
+use yii\helpers\ArrayHelper;
+
+class AuthorizationController extends Controller {
+
+    public function behaviors(): array {
+        return ArrayHelper::merge(Controller::behaviors(), [
+            'authenticator' => [
+                'only' => ['complete'],
+            ],
+            'access' => [
+                'class' => AccessControl::class,
+                'only' => ['complete'],
+                'rules' => [
+                    [
+                        'allow' => true,
+                        'actions' => ['complete'],
+                        'roles' => [P::COMPLETE_OAUTH_FLOW],
+                        'roleParams' => function() {
+                            return [
+                                'accountId' => Yii::$app->user->identity->getAccount()->id,
+                            ];
+                        },
+                    ],
+                ],
+            ],
+        ]);
+    }
+
+    public function verbs(): array {
+        return [
+            'validate' => ['GET'],
+            'complete' => ['POST'],
+            'token'    => ['POST'],
+        ];
+    }
+
+    public function actionValidate(): array {
+        return $this->createOauthProcess()->validate();
+    }
+
+    public function actionComplete(): array {
+        return $this->createOauthProcess()->complete();
+    }
+
+    public function actionToken(): array {
+        return $this->createOauthProcess()->getToken();
+    }
+
+    private function createOauthProcess(): OauthProcess {
+        return new OauthProcess(Yii::$app->oauth->authServer);
+    }
+
+}

api/modules/oauth/controllers/ClientsController.php

@@ -0,0 +1,192 @@
+<?php
+namespace api\modules\oauth\controllers;
+
+use api\controllers\Controller;
+use api\exceptions\ThisShouldNotHappenException;
+use api\modules\oauth\exceptions\UnsupportedOauthClientType;
+use api\modules\oauth\models\OauthClientForm;
+use api\modules\oauth\models\OauthClientFormFactory;
+use api\modules\oauth\models\OauthClientTypeForm;
+use common\models\Account;
+use common\models\OauthClient;
+use common\rbac\Permissions as P;
+use Yii;
+use yii\filters\AccessControl;
+use yii\helpers\ArrayHelper;
+use yii\web\NotFoundHttpException;
+
+class ClientsController extends Controller {
+
+    public function behaviors(): array {
+        return ArrayHelper::merge(parent::behaviors(), [
+            'access' => [
+                'class' => AccessControl::class,
+                'rules' => [
+                    [
+                        'actions' => ['create'],
+                        'allow' => true,
+                        'permissions' => [P::CREATE_OAUTH_CLIENTS],
+                    ],
+                    [
+                        'actions' => ['update', 'delete', 'reset'],
+                        'allow' => true,
+                        'permissions' => [P::MANAGE_OAUTH_CLIENTS],
+                        'roleParams' => function() {
+                            return [
+                                'clientId' => Yii::$app->request->get('clientId'),
+                            ];
+                        },
+                    ],
+                    [
+                        'actions' => ['get'],
+                        'allow' => true,
+                        'permissions' => [P::VIEW_OAUTH_CLIENTS],
+                        'roleParams' => function() {
+                            return [
+                                'clientId' => Yii::$app->request->get('clientId'),
+                            ];
+                        },
+                    ],
+                    [
+                        'actions' => ['get-per-account'],
+                        'allow' => true,
+                        'permissions' => [P::VIEW_OAUTH_CLIENTS],
+                        'roleParams' => function() {
+                            return [
+                                'accountId' => Yii::$app->request->get('accountId'),
+                            ];
+                        },
+                    ],
+                ],
+            ],
+        ]);
+    }
+
+    public function actionGet(string $clientId): array {
+        return $this->formatClient($this->findOauthClient($clientId));
+    }
+
+    public function actionCreate(string $type): array {
+        $account = Yii::$app->user->identity->getAccount();
+        if ($account === null) {
+            throw new ThisShouldNotHappenException('This form should not to be executed without associated account');
+        }
+
+        $client = new OauthClient();
+        $client->account_id = $account->id;
+        $client->type = $type;
+        $requestModel = $this->createForm($client);
+        $requestModel->load(Yii::$app->request->post());
+        $form = new OauthClientForm($client);
+        if (!$form->save($requestModel)) {
+            return [
+                'success' => false,
+                'errors' => $requestModel->getValidationErrors(),
+            ];
+        }
+
+        return [
+            'success' => true,
+            'data' => $this->formatClient($client),
+        ];
+    }
+
+    public function actionUpdate(string $clientId): array {
+        $client = $this->findOauthClient($clientId);
+        $requestModel = $this->createForm($client);
+        $requestModel->load(Yii::$app->request->post());
+        $form = new OauthClientForm($client);
+        if (!$form->save($requestModel)) {
+            return [
+                'success' => false,
+                'errors' => $requestModel->getValidationErrors(),
+            ];
+        }
+
+        return [
+            'success' => true,
+            'data' => $this->formatClient($client),
+        ];
+    }
+
+    public function actionDelete(string $clientId): array {
+        $client = $this->findOauthClient($clientId);
+        (new OauthClientForm($client))->delete();
+
+        return [
+            'success' => true,
+        ];
+    }
+
+    public function actionReset(string $clientId, string $regenerateSecret = null): array {
+        $client = $this->findOauthClient($clientId);
+        $form = new OauthClientForm($client);
+        $form->reset($regenerateSecret !== null);
+
+        return [
+            'success' => true,
+            'data' => $this->formatClient($client),
+        ];
+    }
+
+    public function actionGetPerAccount(int $accountId): array {
+        /** @var Account|null $account */
+        $account = Account::findOne(['id' => $accountId]);
+        if ($account === null) {
+            throw new NotFoundHttpException();
+        }
+
+        $clients = $account->oauthClients;
+        $result = array_map(function(OauthClient $client) {
+            return $this->formatClient($client);
+        }, $clients);
+
+        return $result;
+    }
+
+    private function formatClient(OauthClient $client): array {
+        $result = [
+            'clientId' => $client->id,
+            'clientSecret' => $client->secret,
+            'type' => $client->type,
+            'name' => $client->name,
+            'websiteUrl' => $client->website_url,
+            'createdAt' => $client->created_at,
+            'countUsers' => (int)$client->getSessions()->count(),
+        ];
+
+        switch ($client->type) {
+            case OauthClient::TYPE_APPLICATION:
+                $result['description'] = $client->description;
+                $result['redirectUri'] = $client->redirect_uri;
+                break;
+            case OauthClient::TYPE_MINECRAFT_SERVER:
+                $result['minecraftServerIp'] = $client->minecraft_server_ip;
+                break;
+        }
+
+        return $result;
+    }
+
+    private function createForm(OauthClient $client): OauthClientTypeForm {
+        try {
+            $model = OauthClientFormFactory::create($client);
+        } catch (UnsupportedOauthClientType $e) {
+            Yii::warning('Someone tried use ' . $client->type . ' type of oauth form.');
+            throw new NotFoundHttpException(null, 0, $e);
+        }
+
+        return $model;
+    }
+
+    private function findOauthClient(string $clientId): OauthClient {
+        /** @var OauthClient|null $client */
+        $client = OauthClient::findOne($clientId);
+        if ($client === null) {
+            throw new NotFoundHttpException();
+        }
+
+        return $client;
+    }
+
+}

api/modules/oauth/controllers/IdentityController.php

@@ -0,0 +1,39 @@
+<?php
+namespace api\modules\oauth\controllers;
+
+use api\controllers\Controller;
+use api\modules\oauth\models\IdentityInfo;
+use common\rbac\Permissions as P;
+use Yii;
+use yii\filters\AccessControl;
+use yii\helpers\ArrayHelper;
+
+class IdentityController extends Controller {
+
+    public function behaviors(): array {
+        return ArrayHelper::merge(Controller::behaviors(), [
+            'access' => [
+                'class' => AccessControl::class,
+                'rules' => [
+                    [
+                        'actions' => ['index'],
+                        'allow' => true,
+                        'roles' => [P::OBTAIN_ACCOUNT_INFO],
+                        'roleParams' => function() {
+                            /** @noinspection NullPointerExceptionInspection */
+                            return [
+                                'accountId' => Yii::$app->user->getIdentity()->getAccount()->id,
+                            ];
+                        },
+                    ],
+                ],
+            ],
+        ]);
+    }
+
+    public function actionIndex(): array {
+        /** @noinspection NullPointerExceptionInspection */
+        return (new IdentityInfo(Yii::$app->user->getIdentity()->getAccount()))->info();
+    }
+
+}

api/modules/oauth/exceptions/InvalidOauthClientState.php

@@ -0,0 +1,8 @@
+<?php
+namespace api\modules\oauth\exceptions;
+
+use yii\base\Exception;
+
+class InvalidOauthClientState extends Exception implements OauthException {
+
+}

api/modules/oauth/exceptions/OauthException.php

@@ -0,0 +1,7 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\exceptions;
+
+interface OauthException {
+}

api/modules/oauth/exceptions/UnsupportedOauthClientType.php

@@ -0,0 +1,23 @@
+<?php
+namespace api\modules\oauth\exceptions;
+
+use Throwable;
+use yii\base\Exception;
+
+class UnsupportedOauthClientType extends Exception implements OauthException {
+
+    /**
+     * @var string
+     */
+    private $type;
+
+    public function __construct(string $type, int $code = 0, Throwable $previous = null) {
+        parent::__construct('Unsupported oauth client type', $code, $previous);
+        $this->type = $type;
+    }
+
+    public function getType(): string {
+        return $this->type;
+    }
+
+}

api/modules/oauth/models/ApplicationType.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use common\helpers\Error as E;
+use common\models\OauthClient;
+use yii\helpers\ArrayHelper;
+
+class ApplicationType extends BaseOauthClientType {
+
+    public $description;
+
+    public $redirectUri;
+
+    public function rules(): array {
+        return ArrayHelper::merge(parent::rules(), [
+            ['redirectUri', 'required', 'message' => E::REDIRECT_URI_REQUIRED],
+            ['redirectUri', 'url', 'validSchemes'  => ['[\w]+'], 'message' => E::REDIRECT_URI_INVALID],
+            ['description', 'string'],
+        ]);
+    }
+
+    public function applyToClient(OauthClient $client): void {
+        parent::applyToClient($client);
+        $client->description = $this->description;
+        $client->redirect_uri = $this->redirectUri;
+    }
+
+}

api/modules/oauth/models/BaseOauthClientType.php

@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use api\models\base\ApiForm;
+use common\helpers\Error as E;
+use common\models\OauthClient;
+
+abstract class BaseOauthClientType extends ApiForm implements OauthClientTypeForm {
+
+    public $name;
+
+    public $websiteUrl;
+
+    public function rules(): array {
+        return [
+            ['name', 'required', 'message' => E::NAME_REQUIRED],
+            ['websiteUrl', 'url', 'message' => E::WEBSITE_URL_INVALID],
+        ];
+    }
+
+    public function load($data, $formName = null): bool {
+        return parent::load($data, $formName);
+    }
+
+    public function validate($attributeNames = null, $clearErrors = true): bool {
+        return parent::validate($attributeNames, $clearErrors);
+    }
+
+    public function getValidationErrors(): array {
+        return $this->getFirstErrors();
+    }
+
+    public function applyToClient(OauthClient $client): void {
+        $client->name = $this->name;
+        $client->website_url = $this->websiteUrl;
+    }
+
+}

api/modules/oauth/models/IdentityInfo.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use api\models\base\BaseAccountForm;
+use api\modules\accounts\models\AccountInfo;
+use common\models\Account;
+
+class IdentityInfo extends BaseAccountForm {
+
+    private $model;
+
+    public function __construct(Account $account, array $config = []) {
+        parent::__construct($account, $config);
+        $this->model = new AccountInfo($account);
+    }
+
+    public function info(): array {
+        $response = $this->model->info();
+
+        $response['profileLink'] = $response['elyProfileLink'];
+        unset($response['elyProfileLink']);
+        $response['preferredLanguage'] = $response['lang'];
+        unset($response['lang']);
+
+        return $response;
+    }
+
+}

api/modules/oauth/models/MinecraftServerType.php

@@ -0,0 +1,26 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use common\helpers\Error as E;
+use common\models\OauthClient;
+use common\validators\MinecraftServerAddressValidator;
+use yii\helpers\ArrayHelper;
+
+class MinecraftServerType extends BaseOauthClientType {
+
+    public $minecraftServerIp;
+
+    public function rules(): array {
+        return ArrayHelper::merge(parent::rules(), [
+            ['minecraftServerIp', MinecraftServerAddressValidator::class, 'message' => E::MINECRAFT_SERVER_IP_INVALID],
+        ]);
+    }
+
+    public function applyToClient(OauthClient $client): void {
+        parent::applyToClient($client);
+        $client->minecraft_server_ip = $this->minecraftServerIp;
+    }
+
+}

api/modules/oauth/models/OauthClientForm.php

@@ -0,0 +1,96 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use api\exceptions\ThisShouldNotHappenException;
+use api\modules\oauth\exceptions\InvalidOauthClientState;
+use common\models\OauthClient;
+use common\tasks\ClearOauthSessions;
+use Yii;
+use yii\helpers\Inflector;
+
+class OauthClientForm {
+
+    /**
+     * @var OauthClient
+     */
+    private $client;
+
+    public function __construct(OauthClient $client) {
+        if ($client->type === null) {
+            throw new InvalidOauthClientState('client\'s type field must be set');
+        }
+
+        $this->client = $client;
+    }
+
+    public function getClient(): OauthClient {
+        return $this->client;
+    }
+
+    public function save(OauthClientTypeForm $form): bool {
+        if (!$form->validate()) {
+            return false;
+        }
+
+        $client = $this->getClient();
+        $form->applyToClient($client);
+
+        if ($client->isNewRecord) {
+            $baseId = $id = substr(Inflector::slug($client->name), 0, 250);
+            $i = 0;
+            while ($this->isClientExists($id)) {
+                $id = $baseId . ++$i;
+            }
+
+            $client->id = $id;
+            $client->generateSecret();
+        }
+
+        if (!$client->save()) {
+            throw new ThisShouldNotHappenException('Cannot save oauth client');
+        }
+
+        return true;
+    }
+
+    public function delete(): bool {
+        $transaction = Yii::$app->db->beginTransaction();
+
+        $client = $this->client;
+        $client->is_deleted = true;
+        if (!$client->save()) {
+            throw new ThisShouldNotHappenException('Cannot update oauth client');
+        }
+
+        Yii::$app->queue->push(ClearOauthSessions::createFromOauthClient($client));
+
+        $transaction->commit();
+
+        return true;
+    }
+
+    public function reset(bool $regenerateSecret = false): bool {
+        $transaction = Yii::$app->db->beginTransaction();
+
+        $client = $this->client;
+        if ($regenerateSecret) {
+            $client->generateSecret();
+            if (!$client->save()) {
+                throw new ThisShouldNotHappenException('Cannot update oauth client');
+            }
+        }
+
+        Yii::$app->queue->push(ClearOauthSessions::createFromOauthClient($client, time()));
+
+        $transaction->commit();
+
+        return true;
+    }
+
+    protected function isClientExists(string $id): bool {
+        return OauthClient::find()->andWhere(['id' => $id])->exists();
+    }
+
+}

api/modules/oauth/models/OauthClientFormFactory.php

@@ -0,0 +1,37 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use api\modules\oauth\exceptions\UnsupportedOauthClientType;
+use common\models\OauthClient;
+
+class OauthClientFormFactory {
+
+    /**
+     * @param OauthClient $client
+     *
+     * @return OauthClientTypeForm
+     * @throws UnsupportedOauthClientType
+     */
+    public static function create(OauthClient $client): OauthClientTypeForm {
+        switch ($client->type) {
+            case OauthClient::TYPE_APPLICATION:
+                return new ApplicationType([
+                    'name' => $client->name,
+                    'websiteUrl' => $client->website_url,
+                    'description' => $client->description,
+                    'redirectUri' => $client->redirect_uri,
+                ]);
+            case OauthClient::TYPE_MINECRAFT_SERVER:
+                return new MinecraftServerType([
+                    'name' => $client->name,
+                    'websiteUrl' => $client->website_url,
+                    'minecraftServerIp' => $client->minecraft_server_ip,
+                ]);
+        }
+
+        throw new UnsupportedOauthClientType($client->type);
+    }
+
+}

api/modules/oauth/models/OauthClientTypeForm.php

@@ -0,0 +1,18 @@
+<?php
+declare(strict_types=1);
+
+namespace api\modules\oauth\models;
+
+use common\models\OauthClient;
+
+interface OauthClientTypeForm {
+
+    public function load($data): bool;
+
+    public function validate(): bool;
+
+    public function getValidationErrors(): array;
+
+    public function applyToClient(OauthClient $client): void;
+
+}

api/modules/oauth/models/OauthProcess.php

@@ -0,0 +1,271 @@
+<?php
+namespace api\modules\oauth\models;
+
+use api\components\OAuth2\Exception\AcceptRequiredException;
+use api\components\OAuth2\Exception\AccessDeniedException;
+use api\components\OAuth2\Grants\AuthCodeGrant;
+use api\components\OAuth2\Grants\AuthorizeParams;
+use common\models\Account;
+use common\models\OauthClient;
+use common\rbac\Permissions as P;
+use League\OAuth2\Server\AuthorizationServer;
+use League\OAuth2\Server\Exception\InvalidGrantException;
+use League\OAuth2\Server\Exception\OAuthException;
+use League\OAuth2\Server\Grant\GrantTypeInterface;
+use Yii;
+use yii\helpers\ArrayHelper;
+
+class OauthProcess {
+
+    private const INTERNAL_PERMISSIONS_TO_PUBLIC_SCOPES = [
+        P::OBTAIN_OWN_ACCOUNT_INFO => 'account_info',
+        P::OBTAIN_ACCOUNT_EMAIL => 'account_email',
+    ];
+
+    /**
+     * @var AuthorizationServer
+     */
+    private $server;
+
+    public function __construct(AuthorizationServer $server) {
+        $this->server = $server;
+    }
+
+    /**
+     * Запрос, который должен проверить переданные параметры oAuth авторизации
+     * и сформировать ответ для нашего приложения на фронте
+     *
+     * Входными данными является стандартный список GET параметров по стандарту oAuth:
+     * $_GET = [
+     *     client_id,
+     *     redirect_uri,
+     *     response_type,
+     *     scope,
+     *     state,
+     * ];
+     *
+     * Кроме того можно передать значения description для переопределения описания приложения.
+     *
+     * @return array
+     */
+    public function validate(): array {
+        try {
+            $authParams = $this->getAuthorizationCodeGrant()->checkAuthorizeParams();
+            $client = $authParams->getClient();
+            /** @var OauthClient $clientModel */
+            $clientModel = $this->findClient($client->getId());
+            $response = $this->buildSuccessResponse(
+                Yii::$app->request->getQueryParams(),
+                $clientModel,
+                $authParams->getScopes()
+            );
+        } catch (OAuthException $e) {
+            $response = $this->buildErrorResponse($e);
+        }
+
+        return $response;
+    }
+
+    /**
+     * Метод выполняется генерацию авторизационного кода (authorization_code) и формирование
+     * ссылки для дальнейшнешл редиректа пользователя назад на сайт клиента
+     *
+     * Входными данными является всё те же параметры, что были необходимы для валидации:
+     * $_GET = [
+     *     client_id,
+     *     redirect_uri,
+     *     response_type,
+     *     scope,
+     *     state,
+     * ];
+     *
+     * А также поле accept, которое показывает, что пользователь нажал на кнопку "Принять".
+     * Если поле присутствует, то оно будет интерпретироваться как любое приводимое к false значение.
+     * В ином случае, значение будет интерпретировано, как положительный исход.
+     *
+     * @return array
+     */
+    public function complete(): array {
+        try {
+            Yii::$app->statsd->inc('oauth.complete.attempt');
+            $grant = $this->getAuthorizationCodeGrant();
+            $authParams = $grant->checkAuthorizeParams();
+            /** @var Account $account */
+            $account = Yii::$app->user->identity->getAccount();
+            /** @var \common\models\OauthClient $clientModel */
+            $clientModel = $this->findClient($authParams->getClient()->getId());
+
+            if (!$this->canAutoApprove($account, $clientModel, $authParams)) {
+                Yii::$app->statsd->inc('oauth.complete.approve_required');
+                $isAccept = Yii::$app->request->post('accept');
+                if ($isAccept === null) {
+                    throw new AcceptRequiredException();
+                }
+
+                if (!$isAccept) {
+                    throw new AccessDeniedException($authParams->getRedirectUri());
+                }
+            }
+
+            $redirectUri = $grant->newAuthorizeRequest('user', $account->id, $authParams);
+            $response = [
+                'success' => true,
+                'redirectUri' => $redirectUri,
+            ];
+            Yii::$app->statsd->inc('oauth.complete.success');
+        } catch (OAuthException $e) {
+            if (!$e instanceof AcceptRequiredException) {
+                Yii::$app->statsd->inc('oauth.complete.fail');
+            }
+
+            $response = $this->buildErrorResponse($e);
+        }
+
+        return $response;
+    }
+
+    /**
+     * Метод выполняется сервером приложения, которому был выдан auth_token или refresh_token.
+     *
+     * Входными данными является стандартный список POST параметров по стандарту oAuth:
+     * $_POST = [
+     *     client_id,
+     *     client_secret,
+     *     redirect_uri,
+     *     code,
+     *     grant_type,
+     * ]
+     * для запроса grant_type = authentication_code.
+     * $_POST = [
+     *     client_id,
+     *     client_secret,
+     *     refresh_token,
+     *     grant_type,
+     * ]
+     *
+     * @return array
+     */
+    public function getToken(): array {
+        $grantType = Yii::$app->request->post('grant_type', 'null');
+        try {
+            Yii::$app->statsd->inc("oauth.issueToken_{$grantType}.attempt");
+            $response = $this->server->issueAccessToken();
+            $clientId = Yii::$app->request->post('client_id');
+            Yii::$app->statsd->inc("oauth.issueToken_client.{$clientId}");
+            Yii::$app->statsd->inc("oauth.issueToken_{$grantType}.success");
+        } catch (OAuthException $e) {
+            Yii::$app->statsd->inc("oauth.issueToken_{$grantType}.fail");
+            Yii::$app->response->statusCode = $e->httpStatusCode;
+            $response = [
+                'error' => $e->errorType,
+                'message' => $e->getMessage(),
+            ];
+        }
+
+        return $response;
+    }
+
+    private function findClient(string $clientId): ?OauthClient {
+        return OauthClient::findOne($clientId);
+    }
+
+    /**
+     * Метод проверяет, может ли текущий пользователь быть автоматически авторизован
+     * для указанного клиента без запроса доступа к необходимому списку прав
+     *
+     * @param Account $account
+     * @param OauthClient $client
+     * @param AuthorizeParams $oauthParams
+     *
+     * @return bool
+     */
+    private function canAutoApprove(Account $account, OauthClient $client, AuthorizeParams $oauthParams): bool {
+        if ($client->is_trusted) {
+            return true;
+        }
+
+        /** @var \common\models\OauthSession|null $session */
+        $session = $account->getOauthSessions()->andWhere(['client_id' => $client->id])->one();
+        if ($session !== null) {
+            $existScopes = $session->getScopes()->members();
+            if (empty(array_diff(array_keys($oauthParams->getScopes()), $existScopes))) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @param array $queryParams
+     * @param OauthClient $client
+     * @param \api\components\OAuth2\Entities\ScopeEntity[] $scopes
+     *
+     * @return array
+     */
+    private function buildSuccessResponse(array $queryParams, OauthClient $client, array $scopes): array {
+        return [
+            'success' => true,
+            // Возвращаем только те ключи, которые имеют реальное отношение к oAuth параметрам
+            'oAuth' => array_intersect_key($queryParams, array_flip([
+                'client_id',
+                'redirect_uri',
+                'response_type',
+                'scope',
+                'state',
+            ])),
+            'client' => [
+                'id' => $client->id,
+                'name' => $client->name,
+                'description' => ArrayHelper::getValue($queryParams, 'description', $client->description),
+            ],
+            'session' => [
+                'scopes' => $this->fixScopesNames(array_keys($scopes)),
+            ],
+        ];
+    }
+
+    private function fixScopesNames(array $scopes): array {
+        foreach ($scopes as &$scope) {
+            if (isset(self::INTERNAL_PERMISSIONS_TO_PUBLIC_SCOPES[$scope])) {
+                $scope = self::INTERNAL_PERMISSIONS_TO_PUBLIC_SCOPES[$scope];
+            }
+        }
+
+        return $scopes;
+    }
+
+    private function buildErrorResponse(OAuthException $e): array {
+        $response = [
+            'success' => false,
+            'error' => $e->errorType,
+            'parameter' => $e->parameter,
+            'statusCode' => $e->httpStatusCode,
+        ];
+
+        if ($e->shouldRedirect()) {
+            $response['redirectUri'] = $e->getRedirectUri();
+        }
+
+        if ($e->httpStatusCode !== 200) {
+            Yii::$app->response->setStatusCode($e->httpStatusCode);
+        }
+
+        return $response;
+    }
+
+    private function getGrant(string $grantType = null): GrantTypeInterface {
+        return $this->server->getGrantType($grantType ?? Yii::$app->request->get('grant_type'));
+    }
+
+    private function getAuthorizationCodeGrant(): AuthCodeGrant {
+        /** @var GrantTypeInterface $grantType */
+        $grantType = $this->getGrant('authorization_code');
+        if (!$grantType instanceof AuthCodeGrant) {
+            throw new InvalidGrantException('authorization_code grant have invalid realisation');
+        }
+
+        return $grantType;
+    }
+
+}