Introduction

This Bundle enables integration of the Facebook PHP and JS SDK's. Furthermore it also provides a Symfony2 authentication provider so that users can login to a Symfony2 application via Facebook. Furthermore via custom user provider support the Facebook login can also be integrated with other data sources like the database based solution provided by FOSUserBundle.

Note that logging a user requires multiple steps:

1. the user must be logged into Facebook
2. the user must connect his Facebook account to your site
3. once the user has done 1. and 2. you must trigger the login

For step 1. and 2. there are two options:

1. Add a Facebook login button, this approach requires JS code to handle step 3.
2. Letting the FOSFacebookBundle redirecting to the Facebook login page

Note that the later happens automatically if the first provider in your first firewall configuration is configured to FOSFacebookBundle and the user accesses a page that requires authentication without being authenticated.

Please also refer to the Facebook documentation: https://developers.facebook.com/docs/guides/web/

Please also refer to the official documentation of the SecurityBundle, especially for details on the configuration: http://symfony.com/doc/2.0/book/security/authentication.html

Installation

1. Add this bundle to your and the Facebook PHP SDK to your vendor/ dir:

   • Using the vendors script.

     Add the following lines in your deps file::

     [FOSFacebookBundle]
         git=git://github.com/FriendsOfSymfony/FOSFacebookBundle.git
         target=/bundles/FOS/FacebookBundle
     
     [FacebookSDK]
         git=git://github.com/facebook/php-sdk.git
         target=/facebook
     

     Run the vendors script:

     ./bin/vendors install
     

   • Using git submodules.

     $ git submodule add git://github.com/FriendsOfSymfony/FOSFacebookBundle.git vendor/bundles/FOS/FacebookBundle
     $ git submodule add git://github.com/facebook/php-sdk.git vendor/facebook
     

2. Add the FOS namespace to your autoloader:

    // app/autoload.php
    $loader->registerNamespaces(array(
          'FOS' => __DIR__.'/../vendor/bundles',
          // your other namespaces
    ));
   

3. Add this bundle to your application's kernel:

    // app/ApplicationKernel.php
    public function registerBundles()
    {
        return array(
            // ...
            new FOS\FacebookBundle\FOSFacebookBundle(),
            // ...
        );
    }
   

4. Add the following routes to your application and point them at actual controller actions

    #application/config/routing.yml
    _security_check:
        pattern:  /login_check
    _security_logout:
        pattern:  /logout
   
    #application/config/routing.xml
    <route id="_security_check" pattern="/login_check" />
    <route id="_security_logout" pattern="/logout" />     
   

5. Configure the facebook service in your config:

    # application/config/config.yml
    fos_facebook:
        file:   %kernel.root_dir%/../vendor/facebook/src/base_facebook.php
        alias:  facebook
        app_id: 123456879
        secret: s3cr3t
        cookie: true
        permissions: [email, user_birthday, user_location]
   
    # application/config/config.xml
    <fos_facebook:api
        file="%kernel.root_dir%/../vendor/facebook/src/base_facebook.php"
        alias="facebook"
        app_id="123456879"
        secret="s3cr3t"
        cookie="true"
    >
          <permission>email</permission>
          <permission>user_birthday</permission>
          <permission>user_location</permission>
    </fos_facebook:api>
   

   If you do not include a file value in the config you will have to configure your application to autoload the BaseFacebook class.

6. Add this configuration if you want to use the security component:

    # application/config/config.yml
    security:
        factories:
            - "%kernel.root_dir%/../vendor/bundles/FOS/FacebookBundle/Resources/config/security_factories.xml"
   
        providers:
            fos_facebook:
                id: fos_facebook.auth
   
        firewalls:
            public:
                # since anonymous is allowed users will not be forced to login
                pattern:   ^/.*
                fos_facebook:  true
                anonymous: true
                logout: true
   
        access_control:
            - { path: ^/secured/.*, role: [IS_AUTHENTICATED_FULLY] } # This is the route secured with fos_facebook
            - { path: ^/.*, role: [IS_AUTHENTICATED_ANONYMOUSLY] }
   

   You have to add /secured/ in your routing for this to work. An example would be...

        _facebook_secured:
            pattern: /secured/
            defaults: { _controller: AcmeDemoBundle:Welcome:index }
   

7. Optionally define a custom user provider class and use it as the provider or define path for login

    # application/config/config.yml
    security:
        factories:
              - "%kernel.root_dir%/../vendor/bundles/FOS/FacebookBundle/Resources/config/security_factories.xml"
   
        providers:
            # choose the provider name freely
            my_fos_facebook_provider:
                id: my.facebook.user   # see "Example Customer User Provider using the FOS\UserBundle" chapter further down
   
        firewalls:
            public:
                pattern:   ^/.*
                fos_facebook:
                    login_path: ^/login
                    check_path: ^/login_check$
                    default_target_path: /
                    provider: my_fos_facebook_provider
                anonymous: true
   

8. Optionally use access control to secure specific URLs

    # application/config/config.yml
    security:
        # ...
        
        access_control:
            - { path: ^/facebook/,           role: [ROLE_FACEBOOK] }
            - { path: ^/.*,                  role: [IS_AUTHENTICATED_ANONYMOUSLY] }
   

The role `ROLE_FACEBOOK` has to be added in your User class (see Acme\MyBundle\Entity\User::setFBData() below).
> Note that the order of access control rules matters!

Setting up the JavaScript SDK

A templating helper is included for loading the Facebook JavaScript SDK and initializing it with parameters from your service container. To setup the Facebook JavaScript environment, add the following to your layout just after the opening body tag:

  <body>
      <!-- inside a php template -->
      <?php echo $view['facebook']->initialize(array('xfbml' => true)) ?>
      <!-- inside a twig template -->
      {{ facebook_initialize({'xfbml': true}) }}

If you will be adding XFBML markup to your site you may also declare the namespace, perhaps in the opening html tag:

  <html xmlns:fb="http://www.facebook.com/2008/fbml">

Include the login button in your templates

Just add the following code in one of your templates:

<!-- inside a php template -->
<?php echo $view['facebook']->loginButton(array('autologoutlink' => true)) ?>
<!-- inside a twig template -->
{{ facebook_login_button({'autologoutlink': true}) }}

Note that with this approach only the login and connecting with Facebook will be handled. The step of logging in the user into your Symfony2 application still needs to be triggered. To do this you will in most cases simply subscribe to the "auth.login" event and then redirect to the "check_path":

<script type="text/javascript">
    // this method will get called after the initialisation of facebook
    window.fbAsyncInit = (function(originalFunc) {
        return function() {
            if (originalFunc) originalFunc();
            FB.Event.subscribe('auth.login', function(response) {
               window.location.href = "{{ path('_validate_facebook') }}";
            });
        };
    })(window.fbAsyncInit);
</script>

The "_security_check" route would need to point to a "/login_check" pattern to match the above configuration. The "_security_logout" route should point to your logout URL ("/logout" by default).

Example Customer User Provider using the FOS\UserBundle

This requires adding a service for the custom user provider which is then set to the provider id in the "provider" section in the config.yml:

services:
    my.facebook.user:
        class: Acme\MyBundle\Security\User\Provider\FacebookProvider
        arguments:
            facebook: "@fos_facebook.api"
            userManager: "@fos_user.user_manager"
            validator: "@validator"
            container: "@service_container"

<?php

namespace Acme\MyBundle\Security\User\Provider;

use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
use Symfony\Component\Security\Core\User\UserProviderInterface;
use Symfony\Component\Security\Core\User\UserInterface;
use \BaseFacebook;
use \FacebookApiException;

class FacebookProvider implements UserProviderInterface
{
    /**
     * @var \Facebook
     */
    protected $facebook;
    protected $userManager;
    protected $validator;

    public function __construct(BaseFacebook $facebook, $userManager, $validator)
    {
        $this->facebook = $facebook;
        $this->userManager = $userManager;
        $this->validator = $validator;
    }

    public function supportsClass($class)
    {
        return $this->userManager->supportsClass($class);
    }

    public function findUserByFbId($fbId)
    {
        return $this->userManager->findUserBy(array('facebookID' => $fbId));
    }

    public function loadUserByUsername($username)
    {
        $user = $this->findUserByFbId($username);

        try {
            $fbdata = $this->facebook->api('/me');
        } catch (FacebookApiException $e) {
            $fbdata = null;
        }

        if (!empty($fbdata)) {
            if (empty($user)) {
                $user = $this->userManager->createUser();
                $user->setEnabled(true);
                $user->setPassword('');
                $user->setAlgorithm('');
            }

            // TODO use http://developers.facebook.com/docs/api/realtime
            $user->setFBData($fbdata);

            if (count($this->validator->validate($user, 'Facebook'))) {
                // TODO: the user was found obviously, but doesnt match our expectations, do something smart
                throw new UsernameNotFoundException('The facebook user could not be stored');
            }
            $this->userManager->updateUser($user);
        }

        if (empty($user)) {
            throw new UsernameNotFoundException('The user is not authenticated on facebook');
        }

        return $user;
    }

    public function refreshUser(UserInterface $user)
    {
        if (!$this->supportsClass(get_class($user)) || !$user->getFacebookId()) {
            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', get_class($user)));
        }

        return $this->loadUserByUsername($user->getFacebookId());
    }
}

Finally one also needs to add a getFacebookId() and setFBData() method to the User model. The following example also adds "firstname" and "lastname" properties:

<?php

namespace Acme\MyBundle\Entity;

use FOS\UserBundle\Entity\User as BaseUser;

class User extends BaseUser
{
    /**
     * @var string
     */
    protected $firstname;

    /**
     * @var string
     */
    protected $lastname;

    /**
     * @var string
     */
    protected $facebookID;

    /**
     * @return string
     */
    public function getFirstname()
    {
        return $this->firstname;
    }

    /**
     * @param string $firstname
     */
    public function setFirstname($firstname)
    {
        $this->firstname = $firstname;
    }

    /**
     * @return string
     */
    public function getLastname()
    {
        return $this->lastname;
    }

    /**
     * @param string $lastname
     */
    public function setLastname($lastname)
    {
        $this->lastname = $lastname;
    }

    /**
     * Get the full name of the user (first + last name)
     * @return string
     */
    public function getFullName()
    {
        return $this->getFirstName() . ' ' . $this->getLastname();
    }

    /**
     * @param string $facebookID
     * @return void
     */
    public function setFacebookID($facebookID)
    {
        $this->facebookID = $facebookID;
        $this->setUsername($facebookID);
        $this->salt = '';
    }

    /**
     * @return string
     */
    public function getFacebookID()
    {
        return $this->facebookID;
    }

    /**
     * @param Array
     */
    public function setFBData($fbdata)
    {
        if (isset($fbdata['id'])) {
            $this->setFacebookID($fbdata['id']);
            $this->addRole('ROLE_FACEBOOK');
        }
        if (isset($fbdata['first_name'])) {
            $this->setFirstname($fbdata['first_name']);
        }
        if (isset($fbdata['last_name'])) {
            $this->setLastname($fbdata['last_name']);
        }
        if (isset($fbdata['email'])) {
            $this->setEmail($fbdata['email']);
        }
    }
}