/**
     * Validate the token and return it.
     */
    private PersistentToken getPersistentToken(String[] cookieTokens) {
        if (cookieTokens.length != 2) {
            throw new InvalidCookieException("Cookie token did not contain " + 2 +
                    " tokens, but contained '" + Arrays.asList(cookieTokens) + "'");
        }

        final String presentedSeries = cookieTokens[0];
        final String presentedToken = cookieTokens[1];

        PersistentToken token = persistentTokenRepository.findOne(presentedSeries);

        if (token == null) {
            // No series match, so we can't authenticate using this cookie
            throw new RememberMeAuthenticationException("No persistent token found for series id: " + presentedSeries);
        }

        // We have a match for this user/series combination
        log.info("presentedToken={} / tokenValue={}", presentedToken, token.getTokenValue());
        if (!presentedToken.equals(token.getTokenValue())) {
            // Token doesn't match series value. Delete this session and throw an exception.
            persistentTokenRepository.delete(token);
            throw new CookieTheftException("Invalid remember-me token (Series/token) mismatch. Implies previous cookie theft attack.");
        }

        if (token.getTokenDate().plusDays(TOKEN_VALIDITY_DAYS).isBefore(LocalDate.now())) {
            persistentTokenRepository.delete(token);
            throw new RememberMeAuthenticationException("Remember-me login has expired");
        }
        return token;
    }
 /**
  * When logout occurs, only invalidate the current token, and not all user sessions.
  * <p/>
  * The standard Spring Security implementations are too basic: they invalidate all tokens for the
  * current user, so when he logs out from one browser, all his other sessions are destroyed.
  */
 @Override
 @Transactional
 public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {
     String rememberMeCookie = extractRememberMeCookie(request);
     if (rememberMeCookie != null && rememberMeCookie.length() != 0) {
         try {
             String[] cookieTokens = decodeCookie(rememberMeCookie);
             PersistentToken token = getPersistentToken(cookieTokens);
             persistentTokenRepository.delete(token);
         } catch (InvalidCookieException ice) {
             log.info("Invalid cookie, no persistent token could be deleted");
         } catch (RememberMeAuthenticationException rmae) {
             log.debug("No persistent token found, so no token could be deleted");
         }
     }
     super.logout(request, response, authentication);
 }
    @Override
    protected void onLoginSuccess(HttpServletRequest request, HttpServletResponse response, Authentication successfulAuthentication) {
        String login = successfulAuthentication.getName();

        log.debug("Creating new persistent login for user {}", login);
        User user = userRepository.findOne(login);

        PersistentToken token = new PersistentToken();
        token.setSeries(generateSeriesData());
        token.setUser(user);
        token.setTokenValue(generateTokenData());
        token.setTokenDate(new LocalDate());
        token.setIpAddress(request.getRemoteAddr());
        token.setUserAgent(request.getHeader("User-Agent"));
        try {
            persistentTokenRepository.saveAndFlush(token);
            addCookie(token, request, response);
        } catch (DataAccessException e) {
            log.error("Failed to save persistent token ", e);
        }
    }
    @Override
    @Transactional
    protected UserDetails processAutoLoginCookie(String[] cookieTokens, HttpServletRequest request, HttpServletResponse response) {

        PersistentToken token = getPersistentToken(cookieTokens);
        String login = token.getUser().getLogin();

        // Token also matches, so login is valid. Update the token value, keeping the *same* series number.
        log.debug("Refreshing persistent login token for user '{}', series '{}'", login, token.getSeries());
        token.setTokenDate(new LocalDate());
        token.setTokenValue(generateTokenData());
        token.setIpAddress(request.getRemoteAddr());
        token.setUserAgent(request.getHeader("User-Agent"));
        try {
            persistentTokenRepository.saveAndFlush(token);
            addCookie(token, request, response);
        } catch (DataAccessException e) {
            log.error("Failed to update token: ", e);
            throw new RememberMeAuthenticationException("Autologin failed due to data access problem: " + e.getMessage());
        }
        return getUserDetailsService().loadUserByUsername(login);
    }