fb_infinite.module in Drupal for Facebook 5

This module manages an infinite session for each Facebook App. http://wiki.developers.facebook.com/index.php/Infinite_session_keys

File

fb_infinite.module

<?php

/**
 * @file
 * 
 * This module manages an infinite session for each Facebook App.  
 * http://wiki.developers.facebook.com/index.php/Infinite_session_keys
 */

/**
 * hook_fb.
 */
function fb_infinite_fb($fb, $fb_app, $op, &$return) {
  if ($op == FB_OP_GET_INFINITE_SESSION) {

    // The fb module is asking for infinite session login information.
    // This module knows it, so we provide it.
    $fb_app_data = fb_app_get_data($fb_app);
    $fb_infinite_data = $fb_app_data['fb_infinite'];
    if ($fb_infinite_data['fbu'] && $fb_infinite_data['key']) {

      // Return array with FB id and apikey.
      $return = array(
        $fb_infinite_data['fbu'],
        $fb_infinite_data['key'],
      );
    }
  }
}

/**
 * hook_menu
 */
function fb_infinite_menu($may_cache) {
  $items = array();
  if ($may_cache) {
    $items[] = array(
      'path' => 'fb/infinite/display',
      'title' => t('Facebook session information'),
      'access' => user_access('administer fb apps'),
      // perm defined in fb_app.module
      'callback' => 'fb_infinite_display_page',
      'type' => MENU_CALLBACK,
    );
  }
  else {
    if (arg(0) == 'node' && is_numeric(arg(1))) {
      $node = node_load(arg(1));
      if ($node->type == 'fb_app') {

        // Only show if infinite session is configured.
        $fb_app_data = fb_app_get_data($node->fb_app);
        $fb_infinite_data = $fb_app_data['fb_infinite'];
        if ($fb_infinite_data['key']) {
          $items[] = array(
            'path' => "node/{$node->nid}/fb/infinite/test",
            'title' => t('Infinite session test'),
            'type' => MENU_LOCAL_TASK,
            'access' => node_access('update', $node),
            'callback' => 'fb_infinite_test_page',
            'callback arguments' => array(
              $node->nid,
            ),
          );
        }
      }
    }
  }
  return $items;
}

/**
 * Implementation of hook_form_alter.
 */
function fb_infinite_form_alter($form_id, &$form) {

  //drupal_set_message("fb_infinte_form_alter($form_id) " . dpr($form, 1));

  // Add our settings to the fb_app edit form.
  if (is_array($form['fb_app_data'])) {
    $node = $form['#node'];
    $fb_app_data = fb_app_get_data($node->fb_app);
    $fb_infinite_data = $fb_app_data['fb_infinite'];
    $form['fb_app_data']['fb_infinite'] = array(
      '#type' => 'fieldset',
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
      '#title' => t('Facebook infinite session settings'),
      '#description' => t('An infinite session key is required to access the Facebook API from non-canvas pages.  For example, a cron job.'),
    );
    if (!$node->nid) {

      // User must save apikey and secret before we can prompt for infinite session key.
      $form['fb_app_data']['fb_infinite']['message'] = array(
        '#value' => '<p>' . t('Save your apikey and secret settings first.  Then return here to set up the infinite session.') . '</p>',
      );
    }
    else {
      if ($node->fb_app->canvas) {
        $form['fb_app_data']['fb_infinite']['help'] = array(
          '#value' => t('<a href=!url target=_blank>Get your session key</a>.  If prompted to log in, be sure to check the box that prevents your session from expiring.', array(
            '!url' => "http://apps.facebook.com/" . $node->fb_app->canvas . "/fb/infinite/display",
          )),
          '#prefix' => '<p>',
          '#suffix' => '</p>',
        );
      }
      else {
        $form['fb_app_data']['fb_infinite']['help'] = array(
          '#value' => t('Configure canvas pages for additional help generating an infinite session key.'),
          '#prefix' => '<p>',
          '#suffix' => '</p>',
        );
      }
      $form['fb_app_data']['fb_infinite']['fbu'] = array(
        '#type' => textfield,
        '#title' => t('Facebook User ID'),
        '#default_value' => $fb_infinite_data['fbu'],
      );
      $form['fb_app_data']['fb_infinite']['key'] = array(
        '#type' => textfield,
        '#title' => t('Infinite Session Key'),
        '#default_value' => $fb_infinite_data['key'],
      );

      /* so far, I can't get this to work.
         $form['fb_app_data']['fb_infinite']['code'] =
           array('#type' => textfield,
                 '#title' => t('One-time code'),
                 '#description' => t('Get a one-time code from facebook, <a href=!url target=_blank>here</a>.',
                                     array('!url' => "http://www.facebook.com/code_gen.php?v=1.0&api_key=" . $node->fb_app->apikey)),
           );
         */
    }
  }
}
function fb_infinite_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  if ($node->type == 'fb_app') {
    if ($op == 'submit') {
      $fb_app_data = $node->fb_app_data;
      $fb_infinite_data = $fb_app_data['fb_infinite'];

      // This is an attempt to make the one-time code work.  I can't figure it out.
      // http://forum.developers.facebook.com/viewtopic.php?pid=76361#p76361
      if ($code = $fb_infinite_data['code']) {
        drupal_set_message("code is {$code}");
        $fb = fb_api_init($fb_app, FB_FBU_CURRENT);

        // Does not set user.
        $session = $fb->api_client
          ->auth_getSession($code);

        //dpm($session, "auth_getSession returned");
      }
    }
  }
}

/**
 * Menu callback.  Ensures the user is logged in and displays user id and
 * session key.
 */
function fb_infinite_display_page() {
  global $fb, $fb_app;
  if (!$fb_app) {
    drupal_set_message(t('This page must be viewed as a Facebook canvas page.'), 'error');
    drupal_not_found();
    exit;
  }
  $fbu = $fb
    ->require_login();
  $output .= '<p>' . t('Facebook user id: %fbu', array(
    '%fbu' => $fb->api_client
      ->users_getLoggedInUser(),
  )) . '</p>';
  $output .= '<p>' . t('Facebook session key: %session', array(
    '%session' => $fb->api_client->session_key,
  )) . '</p>';
  $output .= '<p>' . t('Use the values above when configuring the infinite session of your Facebook App.') . '</p>';
  return $output;
}

/**
 * Menu callback to test infinite session values.
 */
function fb_infinite_test_page($nid) {
  if ($GLOBALS['fb']) {
    $url = $GLOBALS['fb_old_base_url'] . "?q=" . $_GET['q'];
    return t('Do not use this page from a canvas page.  Try !link.', array(
      '!link' => l($url, $url),
    ));
  }
  $fb_app = fb_get_app(array(
    'nid' => $nid,
  ));
  $fb = fb_api_init($fb_app, FB_FBU_INFINITE_SESSION);
  $fbu = $fb->api_client
    ->users_getLoggedInUser();
  if ($fbu) {
    $info = $fb->api_client
      ->users_getInfo(array(
      $fbu,
    ), array(
      'about_me',
      'affiliations',
      'name',
      'is_app_user',
      'pic_big',
      'profile_update_time',
      'status',
    ));
    $info = $info[0];
    $fb_link = l($info['name'], 'http://www.facebook.com/profile.php', NULL, 'id=' . $info['uid']);
    drupal_set_message(t('Infinite session key is working.'));
    $output .= '<p>' . t('Facebook infinite session user: !user', array(
      '!user' => $fb_link,
    )) . '</p>';
    $output .= '<p>' . t('This page cannot test that the session key will never expire.  If your cron jobs start to fail, return here to test the login again.') . '</p>';
    return $output;
  }
  else {
    drupal_set_message(t('Infinite session key test failed.'), 'error');

    // TODO: provide helpful hints of how to fix the problem.
    $output .= '<p>' . t('Unable to log into Facebook using infinite session key.') . '</p>';
  }
  return $output;
}

Functions

Name	Description
fb_infinite_display_page	Menu callback. Ensures the user is logged in and displays user id and session key.
fb_infinite_fb	hook_fb.
fb_infinite_form_alter	Implementation of hook_form_alter.
fb_infinite_menu	hook_menu
fb_infinite_nodeapi
fb_infinite_test_page	Menu callback to test infinite session values.