I got this feature working today and it was easier than I thought. I already begun writing some documentation but I'm unsure if this would fit in the current README.md or better be split up in an separate document? Any thoughts @stof or @lsmith77?

I think for now its fine to put it into the README. splitting things up should imho be done in a second step if necessary.

Ok, great. This will also fix an issue when a user is already registered and wants to login with his Facebook account having the same email adress.

Thanks for the help!

I also thought of using the email address for identifying already registered users. I think the problem with this solution is that email match is an effective but not sufficient condition: what if the user registered to his facebook account with a different email address than the one he used for the website?

One solution I thought of is trying to store the user's ID in the session before the authentication process hits and the "check_path" disconnects the user, so that I can use the stored ID in the FacebookProvider to identify the user.

An other more "handcrafty" solution would be to design a different facebook button which does not even use authentication on symfony. After facebook oauth, the button would point to a controller which would recover the info stored in the "fbsr_" cookie using the facebook SDK, and modify the user entry in the manager.

What do you think would be the most efficient?

I used the email condition to prevent an validation error as email_canonical is defined as unique. But I agree it isn't sufficient.

Another, third, solution would be: Still have the normal and Facebook login page but add a new button to the users profile edit page to connect the account. This could be handled independently from the registration process.

Hello!

I'm crazy with this bundle. I have did all the indications of Readme.
But I don't know how I can associate my users of my site web, with FOSFacebookBundle.
The entity of FOSUserBundle has fields facebook_uid and following the documentation of FOSFacebookBundle I created a field facebookId. But my question is: How can user associate his count of my web with his count of facebook?

I use symfony2.1.3-dev.
My config.yml is:

fos_facebook:
    file: %kernel.root_dir%/../vendor/facebook/php-sdk/src/base_facebook.php
    alias: facebook
    app_id: myid
    secret: mysecret
    cookie: tre
    permissions: [email, user_birthday, user_location]
services:
    my.facebook.user:
        class: project\myBundle\Security\User\Provider\FacebookProvider
        arguments:
            facebook: "@fos_facebook.api"
            userManager: "@fos_user.user_manager"

routing.yml

#FosFacebookBundle
_security_check:
      pattern:  /login_check_fb
_security_logout:
      pattern:  /logout

security.yml

providers:
        fos_userbundle:
            id: fos_user.user_provider.username
        my_fos_facebook_provider:
              id: my.facebook.user
    firewalls:
        dev:
            pattern:  ^/(_(profiler|wdt)|css|images|js)/
            security: false
        admin:
            switch_user: true
            context: user
            pattern: /admin(.*)
            form_login:
                provider: fos_userbundle
                login_path: /admin/login
                use_forward: false
                check_path: /admin/login_check
                failure_path: null
                use_referer: true #redirige al usuario a la pagina que venia antes de hacer login
            logout:
                path: /admin/logout
                target: / #url a la que va a ir despues de logout

            anonymous: true
       main:
            pattern: ^/*
            form_login:
                provider: fos_userbundle
                csrf_provider: form.csrf_provider
            fos_facebook:
                app_url: "http://apps.facebook.com/subireventos/"
                server_url: "http://localhost/workspace/web/app_dev.php/"
                login_path: /login
                check_path: /login_check_fb
                provider: my_fos_facebook_provider
            logout:
                handlers: ["fos_facebook.logout_handler"]
            anonymous:    true

In my base.html.twig I included:

{{ facebook_initialize({'xfbml': true, 'fbAsyncInit': 'onFbInit();'}) }}

And in one of the page of login(FOSUserBundle) included: ( with this line code, the user can log on facebook, from my web)

{{ facebook_login_button({'autologoutlink': true}) }}
<script>
  function goLogIn(){
      window.location.href = "{{ path('_security_check') }}";
  }

  function onFbInit() {
      if (typeof(FB) != 'undefined' && FB != null ) {
          FB.Event.subscribe('auth.statusChange', function(response) {
              if (response.session || response.authResponse) {
                  setTimeout(goLogIn, 500);
              } else {
                  window.location.href = "{{ path('_security_logout') }}";
              }
          });
      }
  }
</script>

But I don't know how complete the field facebookId and asociate an user facebook - my web
I tried several changes, but nothing works.
I can log in my web or from facebook, but is separate.
Have I what to do anything in app facebook?
PLEASE HELP!
: )