Correct IP with reverse proxy

Here’s a version of @dmegatool and @sazcurrain’s code which works with Drupal 10 (and probably 8+). I used Claude to write it but it’s working fine on an actual project. The full module code, with comments, is at GitHub.

use Drupal\Core\Form\FormStateInterface;
use Drupal\votingapi\VoteInterface;
use Drupal\Core\Entity\EntityInterface;

function cookie_voter_get_id() {
  $cookie_name = 'Drupal_CookieVoter';

  if (empty($_COOKIE[$cookie_name])) {
    $unique_id = uniqid('vote_', true);
    setcookie(
      $cookie_name,
      $unique_id,
      time() + 31536000, // 1 year expiration
      '/'
    );
    $_COOKIE[$cookie_name] = $unique_id;
  }

  return $_COOKIE[$cookie_name];
}

function cookie_voter_entity_create(EntityInterface $entity) {
  if ($entity instanceof VoteInterface && !\Drupal::currentUser()->id()) {
    $cookie_id = cookie_voter_get_id();
    $entity->set('vote_source', $cookie_id);
  }
}

function cookie_voter_rate_vote_data_alter(&$vote_data, $entity_type, $entity_bundle, $entity_id, $rate_widget, $settings, $user_id) {
  if (empty($user_id) || $user_id == 0) {
    $cookie_id = cookie_voter_get_id();
    $vote_data['vote_source'] = $cookie_id;
  }
}

function cookie_voter_entity_presave(EntityInterface $entity) {
  if ($entity instanceof VoteInterface && $entity->getOwnerId() == 0) {
    $cookie_id = cookie_voter_get_id();
    $entity->set('vote_source', $cookie_id);
  }
}

function cookie_voter_query_votingapi_vote_check_alter($query) {
  foreach ($query->conditions() as $key => $condition) {
    if (isset($condition['field']) &&
        $condition['field'] === 'vote_source' &&
        !\Drupal::currentUser()->id()) {
      $cookie_id = cookie_voter_get_id();
      $condition['value'] = $cookie_id;
      $query->condition('vote_source', $cookie_id, '=');
    }
  }
}

function cookie_voter_module_implements_alter(&$implementations, $hook) {
  if (in_array($hook, ['entity_create', 'rate_vote_data_alter'])) {
    if (isset($implementations['cookie_voter'])) {
      $group = $implementations['cookie_voter'];
      unset($implementations['cookie_voter']);
      $implementations = ['cookie_voter' => $group] + $implementations;
    }
  }
}

Here’s a version of @dmegatool and @sazcurrain’s solution which works with Drupal 10 (and probably 8+). I used Claude to write it but it’s working fine on an actual project. The full module code with comments is at GitHub.

use Drupal\Core\Form\FormStateInterface;
use Drupal\votingapi\VoteInterface;
use Drupal\Core\Entity\EntityInterface;

function cookie_voter_get_id() {
  $cookie_name = 'Drupal_CookieVoter';

  if (empty($_COOKIE[$cookie_name])) {
    $unique_id = uniqid('vote_', true);
    setcookie(
      $cookie_name,
      $unique_id,
      time() + 31536000, // 1 year expiration
      '/'
    );
    $_COOKIE[$cookie_name] = $unique_id;
  }

  return $_COOKIE[$cookie_name];
}

function cookie_voter_entity_create(EntityInterface $entity) {
  if ($entity instanceof VoteInterface && !\Drupal::currentUser()->id()) {
    $cookie_id = cookie_voter_get_id();
    $entity->set('vote_source', $cookie_id);
  }
}

function cookie_voter_rate_vote_data_alter(&$vote_data, $entity_type, $entity_bundle, $entity_id, $rate_widget, $settings, $user_id) {
  if (empty($user_id) || $user_id == 0) {
    $cookie_id = cookie_voter_get_id();
    $vote_data['vote_source'] = $cookie_id;
  }
}

function cookie_voter_entity_presave(EntityInterface $entity) {
  if ($entity instanceof VoteInterface && $entity->getOwnerId() == 0) {
    $cookie_id = cookie_voter_get_id();
    $entity->set('vote_source', $cookie_id);
  }
}

function cookie_voter_query_votingapi_vote_check_alter($query) {
  foreach ($query->conditions() as $key => $condition) {
    if (isset($condition['field']) &&
        $condition['field'] === 'vote_source' &&
        !\Drupal::currentUser()->id()) {
      $cookie_id = cookie_voter_get_id();
      $condition['value'] = $cookie_id;
      $query->condition('vote_source', $cookie_id, '=');
    }
  }
}

function cookie_voter_module_implements_alter(&$implementations, $hook) {
  if (in_array($hook, ['entity_create', 'rate_vote_data_alter'])) {
    if (isset($implementations['cookie_voter'])) {
      $group = $implementations['cookie_voter'];
      unset($implementations['cookie_voter']);
      $implementations = ['cookie_voter' => $group] + $implementations;
    }
  }
}