uw_groups.module

<?php

/**
 * @file
 * Contains uw_groups.module..
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\user\Entity\Role;
use Drupal\uw_groups\NetIDGroups;

/**
 * Implements hook_help().
 */
function uw_groups_help($route_name, RouteMatchInterface $route_match)
{
  switch ($route_name) {
      // Main module help for the uw_groups module.
    case 'help.page.uw_groups':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('UW Groups') . '</p>';
      return $output;

    default:
  }
}

function uw_groups_user_login($account)
{
  $NetIDGroups = new NetIDGroups;

  // Load the current user
  $currentUser = \Drupal\user\Entity\User::load(\Drupal::currentUser()->id());

  // Get this users groups
  $groups = $NetIDGroups->getCurrentUserGroups();

  // Get the user's Roles
  $delete_roles = $user_roles = Drupal::currentUser()->getRoles();

  // Get all active groups
  $active_groups = $NetIDGroups->getActiveGroups();

  // Get all Roles
  $roleObjects = Role::loadMultiple();

  // Sync user groups with Drupal Role Mappings
  if (is_array($groups))
    foreach ($groups as $group) {

      // If it's not an active group, skip it
      if (!in_array(trim($group), $active_groups)) {
        continue;
      }

      // If the user has the role, don't delete it, and skip it.
      if (in_array(trim($group), $user_roles)) {
        if (($key = array_search(trim($group), $delete_roles)) !== false) {
          unset($delete_roles[$key]);
        }
        continue;
      }

      // If the role exists, give it to the user
      foreach ($roleObjects as $roleObject) {
        // Assign the role to the user if the role exists
        if ($roleObject->id() == trim($group)) {
          $currentUser->addRole($roleObject->id());
        }
      }
    }

  if (is_array($delete_roles))
    foreach ($delete_roles as $role) {
      //Pre($role);
      // If this role is an active group, then delete it
      if (in_array($role, $active_groups)) {
        echo 'remove:' . $role;
        $currentUser->removeRole($role);
      }
    }

  // Save role changes to the user
  $currentUser->save();
}