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<?php
namespace Drupal\Core\Session;
use Drupal\Core\Site\Settings;
use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag as SymfonyMetadataBag;
/**
* Provides a container for application specific session metadata.
*/
class MetadataBag extends SymfonyMetadataBag {
/**
* The key used to store the CSRF token seed in the session.
*/
const CSRF_TOKEN_SEED = 's';
/**
* Constructs a new metadata bag instance.
*
* @param \Drupal\Core\Site\Settings $settings
* The settings instance.
*/
public function __construct(Settings $settings) {
$update_threshold = $settings->get('session_write_interval', 180);
parent::__construct('_sf2_meta', $update_threshold);
}
/**
* Set the CSRF token seed.
*
* @param string $csrf_token_seed
* The per-session CSRF token seed.
*/
public function setCsrfTokenSeed($csrf_token_seed) {
$this->meta[static::CSRF_TOKEN_SEED] = $csrf_token_seed;
}
/**
* Get the CSRF token seed.
*
* @return string|null
* The per-session CSRF token seed or null when no value is set.
*/
public function getCsrfTokenSeed() {
if (isset($this->meta[static::CSRF_TOKEN_SEED])) {
return $this->meta[static::CSRF_TOKEN_SEED];
}
}
/**
* Clear the CSRF token seed.
*/
public function clearCsrfTokenSeed() {
unset($this->meta[static::CSRF_TOKEN_SEED]);
}
}