public function __construct(HttpRequest $request, SignatureProviderInterface $signature = NULL)
{
$this->signature = $signature;
$tmp = trim($request->getCookie(self::COOKIE_NAME, ''));
if ($tmp !== '') {
$this->messages = [];
$input = base64_decode($tmp);
if ($this->signature !== NULL) {
$input = $this->signature->verify($input);
}
foreach ((array) json_decode($input, true) as $message) {
$this->messages[] = new FlashMessage($message['type'], $message['message']);
}
$this->modified = true;
}
}
