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摘要: 原创出处 http://niocoder.com/2018/01/17/Spring-Security源码分析七-Spring-Security-记住我/ 「龙飞」欢迎转载，保留摘要，谢谢！

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有这样一个场景——有个用户初访并登录了你的网站，然而第二天他又来了，却必须再次登录。于是就有了“记住我”这样的功能来方便用户使用，然而有一件不言自明的事情，那就是这种认证状态的”旷日持久“早已超出了用户原本所需要的使用范围。这意味着，他们可以关闭浏览器，然后再关闭电脑，下周或者下个月，乃至更久以后再回来，只要这间隔时间不要太离谱，该网站总会知道谁是谁，并一如既往的为他们提供所有相同的功能和服务——与许久前他们离开的时候别无二致。

1. 记住我基本原理

http://dandandeshangni.oss-cn-beijing.aliyuncs.com/github/Spring%20Security/Spring-Security-remeber.png

  1. 用户认证成功之后调用RemeberMeService根据用户名名生成Token由TokenRepository写入到数据库，同时也将Token写入到浏览器的Cookie中
  2. 重启服务之后，用户再次登入系统会由RememberMeAuthenticationFilter拦截，从Cookie中读取Token信息,与persistent_logins表匹配判断是否使用记住我功能。最中由UserDetailsService查询用户信息

1.1 记住我实现

  1. 创建persistent_logins表 

    create table persistent_logins (username varchar(64) not null, series varchar(64) primary key, token varchar(64) not null, last_used timestamp not null);

  2. 登录页面添加记住我复选款（name必须是remeber-me） 

    <input name="remember-me" type="checkbox"> 下次自动登录

  3. 配置MerryyouSecurityConfig 

    http.
    ......
                    .and()
                    .rememberMe()
                    .tokenRepository(persistentTokenRepository())//设置操作表的Repository
                    .tokenValiditySeconds(securityProperties.getRememberMeSeconds())//设置记住我的时间
                    .userDetailsService(userDetailsService)//设置userDetailsService
                    .and()
    	......

1.2 效果如下

https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-remeberme.gif

1.3 源码分析

1.3.1 首次登录

1.3.1.1 AbstractAuthenticationProcessingFilter#successfulAuthentication

protected void successfulAuthentication(HttpServletRequest request,
			HttpServletResponse response, FilterChain chain, Authentication authResult)
			throws IOException, ServletException {

		if (logger.isDebugEnabled()) {
			logger.debug("Authentication success. Updating SecurityContextHolder to contain: "
					+ authResult);
		}
		//# 1.将已认证过的Authentication放入到SecurityContext中
		SecurityContextHolder.getContext().setAuthentication(authResult);
		//# 2.登录成功调用rememberMeServices
		rememberMeServices.loginSuccess(request, response, authResult);

		// Fire event
		if (this.eventPublisher != null) {
			eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(
					authResult, this.getClass()));
		}

		successHandler.onAuthenticationSuccess(request, response, authResult);
	}

  1. 将已认证过的Authentication放入到SecurityContext中
  2. 登录成功调用rememberMeServices

1.3.1.2 AbstractRememberMeServices#loginSuccess

private String parameter = DEFAULT_PARAMETER;//remember-me

public final void loginSuccess(HttpServletRequest request,
			HttpServletResponse response, Authentication successfulAuthentication) {
		// #1.判断是否勾选记住我
		if (!rememberMeRequested(request, parameter)) {
			logger.debug("Remember-me login not requested.");
			return;
		}

		onLoginSuccess(request, response, successfulAuthentication);
	}

  1. 判断是否勾选记住我

1.3.1.3 PersistentTokenBasedRememberMeServices#onLoginSuccess

protected void onLoginSuccess(HttpServletRequest request,
			HttpServletResponse response, Authentication successfulAuthentication) {
		//#1.获取用户名
		String username = successfulAuthentication.getName();

		logger.debug("Creating new persistent login for user " + username);
		//#2.创建Token
		PersistentRememberMeToken persistentToken = new PersistentRememberMeToken(
				username, generateSeriesData(), generateTokenData(), new Date());
		try {
			//#3.存储都数据库
			tokenRepository.createNewToken(persistentToken);
			//#4.写入到浏览器的Cookie中
			addCookie(persistentToken, request, response);
		}
		catch (Exception e) {
			logger.error("Failed to save persistent token ", e);
		}
	}

  1. 获取用户名
  2. 创建Token
  3. 存储都数据库
  4. 写入到浏览器的Cookie中

1.3.2 二次登录Remember-me

1.3.2.1 RememberMeAuthenticationFilter#doFilter

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		//#1.判断SecurityContext中没有Authentication
		if (SecurityContextHolder.getContext().getAuthentication() == null) {
			//#2.从Cookie查询用户信息返回RememberMeAuthenticationToken
			Authentication rememberMeAuth = rememberMeServices.autoLogin(request,
					response);

			if (rememberMeAuth != null) {
				// Attempt authenticaton via AuthenticationManager
				try {
					//#3.如果不为空则由authenticationManager认证
					rememberMeAuth = authenticationManager.authenticate(rememberMeAuth);

					// Store to SecurityContextHolder
					SecurityContextHolder.getContext().setAuthentication(rememberMeAuth);

					onSuccessfulAuthentication(request, response, rememberMeAuth);
......

  1. 判断SecurityContext中没有Authentication
  2. 从Cookie查询用户信息返回RememberMeAuthenticationToken
  3. 如果不为空则由authenticationManager认证

1.3.2.2 AbstractRememberMeServices#autoLogin

public final Authentication autoLogin(HttpServletRequest request,
			HttpServletResponse response) {
			//#1.获取Cookie
		String rememberMeCookie = extractRememberMeCookie(request);

		if (rememberMeCookie == null) {
			return null;
		}

		logger.debug("Remember-me cookie detected");

		if (rememberMeCookie.length() == 0) {
			logger.debug("Cookie was empty");
			cancelCookie(request, response);
			return null;
		}

		UserDetails user = null;

		try {
			//#2.解析Cookie
			String[] cookieTokens = decodeCookie(rememberMeCookie);
			//#3.获取用户凭证
			user = processAutoLoginCookie(cookieTokens, request, response);
			//#4.检查用户凭证
			userDetailsChecker.check(user);

			logger.debug("Remember-me cookie accepted");
			//#5.返回Authentication
			return createSuccessfulAuthentication(request, user);
		}
		catch (CookieTheftException cte) {
			cancelCookie(request, response);
			throw cte;
		}
		catch (UsernameNotFoundException noUser) {
			logger.debug("Remember-me login was valid but corresponding user not found.",
					noUser);
		}
		catch (InvalidCookieException invalidCookie) {
			logger.debug("Invalid remember-me cookie: " + invalidCookie.getMessage());
		}
		catch (AccountStatusException statusInvalid) {
			logger.debug("Invalid UserDetails: " + statusInvalid.getMessage());
		}
		catch (RememberMeAuthenticationException e) {
			logger.debug(e.getMessage());
		}

		cancelCookie(request, response);
		return null;
	}

  1. 获取Cookie
  2. 解析Cookie
  3. 获取用户凭证
  4. 检查用户凭证

2. 代码下载

从我的 github 中下载，https://github.com/longfeizheng/logback

文章目录
  1. 1. 1. 记住我基本原理
    1. 1.1. 1.1 记住我实现
    2. 1.2. 1.2 效果如下
    3. 1.3. 1.3 源码分析
      1. 1.3.1. 1.3.1 首次登录
        1. 1.3.1.1. 1.3.1.1 AbstractAuthenticationProcessingFilter#successfulAuthentication
        2. 1.3.1.2. 1.3.1.2 AbstractRememberMeServices#loginSuccess
        3. 1.3.1.3. 1.3.1.3 PersistentTokenBasedRememberMeServices#onLoginSuccess
      2. 1.3.2. 1.3.2 二次登录Remember-me
        1. 1.3.2.1. 1.3.2.1 RememberMeAuthenticationFilter#doFilter
        2. 1.3.2.2. 1.3.2.2 AbstractRememberMeServices#autoLogin
  2. 2. 2. 代码下载