You are here

Home » API reference » Drupal for Facebook 7.3 » fb.module

function fb_ajax_event in Drupal for Facebook 7.3

Same name and namespace in other branches
  1. 6.3 fb.module \fb_ajax_event()
  2. 7.4 fb.module \fb_ajax_event()

Ajax callback handles an event from facebook's javascript sdk.

http://developers.facebook.com/docs/reference/javascript/FB.Event.subscribe

Return value

Array of javascript to be evaluated by the page which called this callback.

See also

fb.js and

1 string reference to 'fb_ajax_event'
fb_menu in ./fb.module
Implements hook_menu().

File

./fb.module, line 1963
This is the core required module of Drupal for Facebook.

Code

function fb_ajax_event($event_type) {
  global $_fb, $_fb_app;
  $js_array = array();
  if (isset($_REQUEST['appId'])) {
    $_fb_app = fb_get_app(array(
      'id' => $_REQUEST['appId'],
    ));

    // Remember signed_request in session, in case third party cookies are disabled.
    if (isset($_REQUEST['signed_request']) && $_REQUEST['signed_request'] && variable_get(FB_VAR_USE_SESSION, TRUE)) {
      $_SESSION['_fb_' . $_fb_app->id] = $_REQUEST['signed_request'];
    }
    elseif (isset($_REQUEST['access_token']) && $_REQUEST['access_token'] && variable_get(FB_VAR_USE_SESSION, TRUE)) {
      $_SESSION['_fb_token_' . $_fb_app->id] = $_REQUEST['access_token'];
    }
    else {
      unset($_SESSION['_fb_' . $_fb_app->id]);
      unset($_SESSION['_fb_token_' . $_fb_app->id]);
    }
    if ($_fb_app) {
      $_fb = fb_api_init($_fb_app);

      // Data to pass to hook_fb.
      $data = array(
        'fb_app' => $_fb_app,
        'fb' => $_fb,
        'event_type' => $event_type,
        'event_data' => $_POST,
      );
      $js_array = fb_invoke(FB_OP_AJAX_EVENT, $data, $js_array);
    }
    else {
      watchdog('fb', 'fb_ajax_event did not find application %id', array(
        '%id' => $_REQUEST['appId'],
      ), WATCHDOG_ERROR);
    }
    if ($event_type == 'session_change') {

      // Session change is a special case.  If user has logged out of
      // facebook, we want a new drupal session.  We do this here, even if
      // fb_user.module is not enabled.
      if (!isset($_POST['fbu']) || !$_POST['fbu']) {

        // Logout, not login.
        _fb_logout();
      }
    }
  }
  else {
    watchdog('fb', 'fb_ajax_event called badly.  Not passed appId.', array(), WATCHDOG_ERROR);

    // Trying to track down what makes this happen.
    if (fb_verbose() == 'extreme') {
      watchdog('fb', 'fb_ajax_event called badly.  Not passed appId. trace: !trace', array(
        '!trace' => '<pre>' . print_r(debug_backtrace(), 1) . '</pre>',
      ), WATCHDOG_ERROR);
    }
  }
  drupal_json_output(array_values($js_array));

  //exit();
}