public function authenticate(TokenInterface $token)
 {
     if (!$this->supports($token)) {
         return;
     }
     if ($this->key !== $token->getKey()) {
         throw new BadCredentialsException('The presented key does not match.');
     }
     $user = $token->getUser();
     $this->userChecker->checkPostAuth($user);
     $authenticatedToken = new RememberMeToken($user, $this->providerKey, $this->key);
     $authenticatedToken->setAttributes($token->getAttributes());
     return $authenticatedToken;
 }