ding_staff.module

<?php
/**
 * @file
 * Code for the Ding staff feature.
 */

include_once 'ding_staff.features.inc';

/**
 * Implements hook_ctools_plugin_directory().
 *
 * It simply tells panels where to find the .inc files that define various
 * args, contexts, content_types. In this case the subdirectories of
 * ctools_plugin_example/panels are used.
 */
function ding_staff_ctools_plugin_directory($module, $plugin) {
  if ($module == 'ctools' && !empty($plugin)) {
    return "plugins/$plugin";
  }
}

/**
 * Implements of hook_rules_action_info().
 */
function ding_staff_rules_action_info() {
  return array(
    'ding_staff_add_role_staff' => array(
      'label' => t('Add staff role to user'),
      'group' => 'user',
      'parameter' => array(
        'profile_user' => array(
          'type' => 'user',
          'label' => t('User to add staff role to'),
        ),
      ),
    ),
  );
}
/**
 * Action to add the staff role to a user.
 *
 * Since we cannot know which role ID the staff role has been assigned,
 * this function is used instead of the "add user role" action
 *
 * @param object $profile_user
 *   User object.
 */
function ding_staff_add_role_staff($profile_user) {
  // Get the uid from the object.
  if (isset($profile_user->uid)) {
    $uid = $profile_user->uid;
  }
  else {
    return;
  }

  // Make sure we have a user record.
  if ($uid) {
    // Define "staff" as the role to add.
    $role_name = "staff";
    $user = user_load($uid);

    // If the user doesn't already have the role, add the role to that user.
    $key = array_search($role_name, $user->roles);
    if ($key == FALSE) {

      // Get the rid from the roles table.
      $roles = user_roles(TRUE);
      $rid = array_search($role_name, $roles);
      if ($rid != FALSE) {
        $new_role[$rid] = $role_name;
        // Add new role to existing roles.
        $all_roles = $user->roles + $new_role;
        user_save($user, array('roles' => $all_roles));
        drupal_set_message(t('@username has been assigned the staff role.', array('@username' => $profile_user->name)), 'status');
      }
    }
  }
}


/**
 * Implements hook_views_default_views_alter().
 *
 * Since we cannot know which role ID the staff role has been assigned,
 * we overwrite the rids in the staff view
 */
function ding_staff_views_default_views_alter(&$views) {
  if (!empty($views['ding_staff'])) {
    $roles = user_roles(TRUE);
    $rid = array_search("staff", $roles);

    if ($rid) {
      $rids = array();
      $rids[$rid] = $rid;

      // Replace existing rid defined in the view with the actual rid of role
      // "staff".
      $views['ding_staff']->display['ding_staff_list_all']->display_options['filters']['rid']['value'] = $rids;
      $views['ding_staff']->display['ding_staff_library_departments']->display_options['filters']['rid']['value'] = $rids;
    }
  }
}

/**
 * Implements hook_og_context_negotiation_info().
 */
function ding_staff_og_context_negotiation_info() {
  $providers = array();

  $providers['ding-staff'] = array(
    'name' => t('Ding Staff'),
    'description' => t("Determine context user node."),
    'callback' => 'ding_staff_og_context_handler',
  );

  return $providers;
}

/**
 * Callback for OG context negotiation that tries to find library context.
 *
 *
 * @return array
 *   Node ids.
 */
function ding_staff_og_context_handler() {
  $nids = array();

  $item = menu_get_item();
  if (isset($item['page_arguments'][0]->roles) && isset($item['page_arguments'][0]->roles[16])) {
    // Look up staff profile and check if there is a connection to a library
    // group.
    $profile = profile2_load_by_user($item['page_arguments'][0], 'ding_staff_profile');
    if (isset($profile) && isset($profile->og_group_ref[LANGUAGE_NONE])) {
      $values = $profile->og_group_ref[LANGUAGE_NONE];
      foreach ($values as $value) {
        $nids[] = $value['target_id'];
      }
    }
  }

  return array(
    'node' => $nids,
  );
}