DisallowBasicAuthRequests.php

<?php

namespace Drupal\basic_auth\PageCache;

use Drupal\Core\PageCache\RequestPolicyInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Cache policy for pages served from basic auth.
 *
 * This policy disallows caching of requests that use basic_auth for security
 * reasons. Otherwise responses for authenticated requests can get into the
 * page cache and could be delivered to unprivileged users.
 */
class DisallowBasicAuthRequests implements RequestPolicyInterface {
    
    /**
     * {@inheritdoc}
     */
    public function check(Request $request) {
        $username = $request->headers
            ->get('PHP_AUTH_USER');
        $password = $request->headers
            ->get('PHP_AUTH_PW');
        if (isset($username) && isset($password)) {
            return self::DENY;
        }
    }

}