Spring Security源码分析七：Spring Security 记住我

java干货

发布于 2021-02-19 11:42:01

6240

发布于 2021-02-19 11:42:01

文章被收录于专栏：java干货

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。

记住我基本原理

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

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
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

记住我实现

创建表

登陆页面添加记住我复选款（name必须是remeber-me）

配置

源码分析

首次登录

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);
	}

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

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);
	}

判断是否勾选记住我

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);
		}
	}

获取用户名
创建Token
存储都数据库
写入到浏览器的Cookie中

二次登录Remember-me

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);
......

判断SecurityContext中没有Authentication

从Cookie查询用户信息返回RememberMeAuthenticationToken

如果不为空则由authenticationManager认证

获取Cookie

解析Cookie

获取用户凭证

检查用户凭证