IpCacheContext.php

<?php

namespace Drupal\Core\Cache\Context;

use Drupal\Core\Cache\CacheableMetadata;

/**
 * Defines the IpCacheContext service, for "per IP address" caching.
 *
 * Cache context ID: 'ip'.
 */
class IpCacheContext extends RequestStackCacheContextBase implements CacheContextInterface {
    
    /**
     * {@inheritdoc}
     */
    public static function getLabel() {
        return t('IP address');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContext() {
        return $this->requestStack
            ->getCurrentRequest()
            ->getClientIp();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheableMetadata() {
        return new CacheableMetadata();
    }

}