App token parsing

Thank you dave for this awesome module. You have already stated that you not actively maintaining the module, I will soon join the maintainers crew.

I have successfully installed the module and got everything working until it got to the point where the module had to receive app token from facebook.

When i inputted the app id and the app secret, it returned "Unable to get an application token. Are you sure your ID and Secret are correct ".

i had to dig into the code to know where the error was generated from. fb_admin_application_edit_form_validate() function calls fb_admin_get_app_token() to return the app token but unfortunately the latter function did not return the token, so i tested it and this is what i found.

The facebook endpoint the fb_admin_get_app_token() calls return JSON string that needs to be parsed. Maybe when you were writing the module it return something different.

This is how the code is parsed which unfortunately cannot successfully return the app token.

<?php
if ($http->code == 200 && isset($http->data)) {
    $parse = explode('=', $http->data);
    $token = $parse[1];
    return $token;
  }
?>

So i replaced the bolded part with

<?php
$token = drupal_json_decode($http->data);
    return $token['access_token'];
?>

which returns the app token successfully.

i had to register to post this. Please anybody that can patch this module should do so as i cannot do it considering that i am new to the system. i am going to edit the copy on my installed to reflect this until the patch is made.

the function is found in fb.admin.inc

Thanks.