interface PermissionsHashGeneratorInterface

interface PermissionsHashGeneratorInterface {
    
    /**
     * Generates a hash that uniquely identifies a user's permissions.
     *
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The user account for which to get the permissions hash.
     *
     * @return string
     *   A permissions hash.
     */
    public function generate(AccountInterface $account);
    
    /**
     * Gets the cacheability metadata for the generated hash.
     *
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The user account for which to get the permissions hash.
     *
     * @return \Drupal\Core\Cache\CacheableMetadata
     *   A cacheable metadata object.
     */
    public function getCacheableMetadata(AccountInterface $account) : CacheableMetadata;

}