Facebook App via PHP SDK - Redirecting back to page where someone added my app after getting permissions

Question

I have little problem. When I need my app to ask user to grant permissions to the app I use following code:

<?php
$loginUrl = $facebook->getLoginUrl(
array(
    'canvas'    => 1,
    'fbconnect' => 0,
    'scope' => 'email,publish_stream,offline_access',
));
?>
echo "<script type='text/javascript'>top.location.href = '$loginUrl';</script>";

I works OK, but after user press "grant permissions" he is redirected to my app URL. I mean like http://mydomain.com/myapp/ directly, not my app page on Facebook. I can work around it - I know my app's Facebook address, so I redirect him to proper http://apps.facebook.com/myappname. It works OK too. BUT - when somebody adds my application on some page tab - here is where problem appears. Because I don't know where to redirect user anymore - I don't know, from what page my app was called.

Is there any way to get to know, from what page my app was called, or, even better, to make Facebook properly redirect user to the "facebook page" where app tab were added after "grant permission" dialog ?

Solution 1

You can set redirect_uri like so:

   <?php
    $loginUrl = $facebook->getLoginUrl(
    array(
        'canvas'    => 1,
        'fbconnect' => 0,
        'scope' => 'email,publish_stream,offline_access',
        'redirect_uri' => 'http://yourdomain.com/app', //the url to go to after a successful login
    ));

    echo "<script type='text/javascript'>top.location.href = '$loginUrl';</script>";
   ?>

Solution 2

Seems to be the only thing you can do is detect if the user is viewing your page from outside of facebook and then redirect them to your facebook app page.

Comments

[Sergii Nester]

I did. Question is about "where" to redirect, not "how" to redirect. May be you've confused it with thousands "omg, how to redirect back to facebook" questions. Anyway, thnx for you time and answer. p.s. if you interested, i got this sorted out - forum.developers.facebook.net/viewtopic.php?pid=351648#p3516‌​48

[user14322501]

this verified my own thoughts, thanks Pav...good to know I can define my own redirect URI

[Mikepote]

Could you please post the solution here, the facebook forum is not a stable place to keep the solution, it may be erased or removed from there.

[rickyduck]

for the exact reason as what has happened now

[markcial]

@Mikepote yes, in fact, the answer has been deleted, is a shame i still have no clue about how to redirect from a gateway server after a successful login :(

[Blake Frederick]

Arg the solution on the Facebook forum is now 404ing.

[Blake Frederick]

So far from my searching I've found this to be the case.