Own grantType for federation auth

Actually it is quite cool to use this as an auth service that handles different apps or resource servers. I want to use it as an central auth instance. So the only point that is missing actually for it is that I can login/register alternatively with Facebook or Google or something like this at the Auth Service.

So actually I need a new grant_type or? that takes up the signed_request that is returned e.g. by FaceBook and validated so that I can somehow create the new token for our system.

So add new granttype to config and storage map e.g.:

           'storageMap' => [
                'user_credentials' => 'api\models\User',
                'federation_credentials' => 'api\models\Auth'
            ],
           'grantTypes' => [
                'client_credentials' => [
                    'class' => 'OAuth2\GrantType\ClientCredentials',
                    'allow_public_clients' => false
                ],
                'user_credentials' => [
                    'class' => 'OAuth2\GrantType\UserCredentials'
                ],
                'refresh_token' => [
                    'class' => 'OAuth2\GrantType\RefreshToken',
                    'always_issue_new_refresh_token' => true
                ],
                'federation_credentials' => [
                    'class' => 'api\components\auth\ExternalCredentials'
                ]
            ],

ExternalCredentials may look like this? (could not test it):

namespace api\components\auth;

use OAuth2\GrantType\GrantTypeInterface;
use OAuth2\RequestInterface;
use OAuth2\ResponseInterface;
use OAuth2\ResponseType\AccessTokenInterface;

class ExternalCredentials implements GrantTypeInterface
{
    private $userInfo;

    protected $storage;

    public function __construct(ExternalCredentialsInterface $storage)
    {
        $this->storage = $storage;
    }

    public function getQuerystringIdentifier()
    {
        return 'signed_request';
    }

    public function validateRequest(RequestInterface $request, ResponseInterface $response)
    {
        if (!$request->request("signed_request")) {
            $response->setError(400, 'invalid_request', 'Missing parameters: "username" and "password" required');

            return null;
        }

        if (!$this->storage->checkUserCredentials($request->request("signed_request"))) {
            $response->setError(401, 'invalid_grant', 'Invalid signed request');

            return null;
        }

        $userInfo = $this->storage->getUserDetails($request->request("signed_request"));

        if (empty($userInfo)) {
            $response->setError(400, 'invalid_grant', 'Unable to retrieve user information');

            return null;
        }

        if (!isset($userInfo['user_id'])) {
            throw new \LogicException("you must set the user_id on the array returned by getUserDetails");
        }

        $this->userInfo = $userInfo;

        return true;
    }

    public function getClientId()
    {
        return null;
    }

    public function getUserId()
    {
        return $this->userInfo['user_id'];
    }

    public function getScope()
    {
        return isset($this->userInfo['scope']) ? $this->userInfo['scope'] : null;
    }

    public function createAccessToken(AccessTokenInterface $accessToken, $client_id, $user_id, $scope)
    {
        return $accessToken->createAccessToken($client_id, $user_id, $scope);
    }
}

And I have to manually add to filsh's and bshaffer's repo the new grant type? This seems not like the perfect way. How can I add my own grant_type?

filsh / yii2-oauth2-server

Own grantType for federation auth #54