Facebook Grant Type

FacebookGrant.php

<?php
namespace MyApp\OAuth2\GrantType;

use Facebook\FacebookRequest;
use Facebook\FacebookSession;
use Facebook\GraphUser;
use OAuth2\RequestInterface;
use OAuth2\ResponseInterface;
use OAuth2\Storage\ClientCredentialsInterface;
use OAuth2\Storage\AccessTokenInterface;

class FacebookGrant implements GrantTypeInterface {
  
    public function getQuerystringIdentifier() {
        return 'facebook';
    }
    public function validateRequest(RequestInterface $request, ResponseInterface $response) {
        if(!$this->clientAssertion->validateRequest($request, $response)) {
            return false;
        }
        if (!$request->request("fb_access_token")) {
            $response->setError(400, 'invalid_request', 'A fb_access_token token is required');
            return null;
        }
        
        $fb_access_token = $request->request("fb_access_token");

        $session = new FacebookSession($fb_access_token);
        $request = new FacebookRequest($session, 'GET', '/me');
        $response = $request->execute();
        $fb_user = $response->getGraphObject(GraphUser::className());
        
        if(!($email = $fb_user->getProperty('email')) || empty($email)){
            $response->setError(400, 'invalid_request', 'Email address permission was not granted for user');
            return null;
        }
        
        $user = User::loadByEmail($email);
        
        if($user === null) {
            $user = new User();
            $user->email = $email;
            $user->save();
        }
      
        $this->userInfo = $user;
        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);
    }
}

server.php

<?php
use MyApp\OAuth2\GrantType\FacebookGrant;

$storage = new OAuth2\Server\Pdo();
$server = new OAuth2\Server($storage);

$server->addGrantType(new FacebookGrant(), 'facebook');

Hello @phindmarsh , Did u implemented this kind of grant in apigility? cfr bshaffer/oauth2-server-php#627

I need to do implement fb connect on an apigility app. This gist is the closest to what I need.

Would greatly appreciate some help on this.

Regards.