HWIOAuthBundle connect functionality without FUB

README.md

HWIOAuthBundle Connect

This describes the "connect" functionality that is currently undocumented in the HWIOAuthBundle. This allows you to connect a user to a resource owner when that user is already logged in using some other method (without FOSUserBundle).

Note: you have to use version 1.2 for now, see #1007.

This was mostly figured out by reading hwi/oauth-bundle/Controller/ConnectController.php.

hwi_oauth.yaml

hwi_oauth:
    # list of names of the firewalls in which this bundle is active, this setting MUST be set
    firewall_names:
        - main

    # https://github.com/hwi/HWIOAuthBundle/blob/master/Resources/doc/2-configuring_resource_owners.md
    resource_owners:
        google:
            type: google
            client_id: '%env(GOOGLE_OAUTH_CLIENT_ID)%'
            client_secret: '%env(GOOGLE_OAUTH_CLIENT_SECRET)%'
            scope: email

    # For the full reference:
    # https://github.com/hwi/HWIOAuthBundle/blob/master/Resources/doc/internals/reference_configuration.md
    #
    # We don't use the registration form in this example, we assume you already have a way to log
    # in users using e.g. username/password.
    connect:
        # If enabled, the user has to confirm after logging in wit the third party. The template can
        # be customized at @HWIOAuth/Connect/connect_confirm.html.twig
        confirmation: false
        # A service that implements HWI\Bundle\OAuthBundle\Connect\AccountConnectorInterface, in
        # this example simply the UserProvider.
        account_connector: Acme\Security\Provider\UserProvider

OAuthConnectController.php

<?php

namespace Acme\Controller;

use HWI\Bundle\OAuthBundle\Templating\Helper\OAuthHelper;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\Security\Http\Util\TargetPathTrait;

// This is completely optional. It simply allows for a prettier URL,
// and makes HWI redirect to the path I want, instead of showing a
// success message.
final class OAuthConnectController extends AbstractController
{
    use TargetPathTrait;

    private OAuthHelper $oAuthHelper;

    // This service isn't public by default, alias it in your services.yaml:
    // HWI\Bundle\OAuthBundle\Templating\Helper\OAuthHelper: '@hwi_oauth.security.oauth_utils'
    public function __construct(OAuthHelper $oAuthHelper)
    {
        $this->oAuthHelper = $oAuthHelper;
    }

    public function __invoke(Request $request, string $type): Response
    {
        $redirectUrl = $this->generateUrl(
            'hwi_oauth_connect_service',
            ['service' => $type],
            UrlGeneratorInterface::ABSOLUTE_URL
        );
        $connectUrl = $this->oAuthHelper->getAuthorizationUrl(
            $type,
            $redirectUrl
        );

        // We save the user settings page as a target path because the HWI
        // ConnectController shows a confirmation page if this isn't set.
        $this->saveTargetPath(
            $request->getSession(),
            'main',
            $this->generateUrl('my_custom_url')
        );

        return $this->redirect($connectUrl);
    }
}

routing.yaml

hwi_oauth_redirect:
    resource: "@HWIOAuthBundle/Resources/config/routing/redirect.xml"
    prefix:   /connect

hwi_oauth_connect:
    resource: "@HWIOAuthBundle/Resources/config/routing/connect.xml"
    prefix:   /connect

google_login:
    path: /login/check-google
    
# Optional custom route with a prettier url
my_app.oauth_connect:
    path: /sso/{type}/connect
    methods: [GET]
    controller: Acme\Controller\OAuthConnectController
    requirements:
        type: 'google|office365'

UserProvider.php

<?php

namespace Acme\Security\Provider;

use HWI\Bundle\OAuthBundle\Connect\AccountConnectorInterface;
use HWI\Bundle\OAuthBundle\OAuth\Response\UserResponseInterface;
use HWI\Bundle\OAuthBundle\Security\Core\User\OAuthAwareUserProviderInterface;
use Symfony\Component\Messenger\MessageBusInterface;
use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Security\Core\User\UserProviderInterface;
use Acme\Domain\Model\Account;
use Acme\Domain\Repository\AccountRepositoryInterface;

// We implement the AccountConnectorInterface on our user provider, but
// you can define a separate service as well.
final class UserProvider implements
    UserProviderInterface,
    OAuthAwareUserProviderInterface,
    AccountConnectorInterface
{
    private AccountRepositoryInterface $accountRepository;

    public function __construct(AccountRepositoryInterface $accountRepository) 
    {
        $this->accountRepository = $accountRepository;
    }

    /** user provider methods are ommitted **/ 

    // This method is used when logging in, and is already documented in the bundle itself.
    public function loadUserByOAuthUserResponse(UserResponseInterface $response): UserInterface
    {
        $account = $this->accountRepository->findOneByResourceOwnerAndIdentifier(
            $response->getResourceOwner()->getName(),
            $response->getData()['id']
        );

        if ($account === null) {
            throw new UsernameNotFoundException('No account associated');
        }

        return $account;
    }

    // This method is called when the connect is succesful. You should store
    // the association in the database here.
    public function connect(
        UserInterface $user,
        UserResponseInterface $response
    ) {
        if (!$user instanceof Account) {
            throw new \Exception('Invalid user');
        }

        // How you store the association is application specific,
        // this is just an example
        $account->addConnection(
          $response->getResourceOwner()->getName(),
          $response->getData()['id']
        );
        $this->accountRepository->persist($account);
    }

}

your-template.html.twig

{# 
  If you want to put the link directly in your template, use the following.
  It creates an URL to authenticate with your provider (google in this case),
  with the redirect_url set to HWI's connect controller route.
#}
<a href="{{ hwi_oauth_authorization_url('google', url('hwi_oauth_connect_service', {service: google})) }}">
  Connect with Google
</a>

{# I use a custom controller instead, for a cleaner URL #}
<a href="{{ path('my_app.oauth_connect', {type: 'google'}) }}">
    Connect with Google
</a>

'@hwi_oauth.templating.helper.oauth' now is '@hwi_oauth.security.oauth_utils'
Just for possible future questions because it was my mistake not to test this solution

Thanks! I updated the gist.

Error: Class App\Security\UserProvider contains 3 abstract methods and must therefore be declared abstract or implement the remaining methods (Symfony\Component\Security\Core\User\UserProviderInterface::refreshUser, Symfony\Component\Security\Core\User\UserProviderInterface::supportsClass, Symfony\Component\Security\Core\User\UserProviderInterface::loadUserByIdentifier)

Cannot autowire service "App\Controller\OAuthConnectController": argument "$oAuthHelper" of method "__construct()" has type "HWI\Bundle\OAuthBundle\Templating\Helper\OAuthHelper" but this class was not found.