Spring Security源码分析八:Spring Security 退出

栏目: Java · 发布时间: 8年前

内容简介:Spring Security源码分析八:Spring Security 退出

Spring Security是一个能够为基于Spring的企业应用系统提供声明式的安全访问控制解决方案的安全框架。它提供了一组可以在Spring应用上下文中配置的Bean,充分利用了Spring IoC,DI(控制反转Inversion of Control ,DI:Dependency Injection 依赖注入)和AOP(面向切面编程)功能,为应用系统提供声明式的安全访问控制功能,减少了为企业系统安全控制编写大量重复代码的工作。

退出原理

  1. 清除 Cookie
  2. 清除当前用户的 remember-me 记录
  3. 使当前 session 失效
  4. 清空当前的 SecurityContext
  5. 重定向到登录界面

Spring Security 的退出请求(默认为 /logout )由LogoutFilter过滤器拦截处理。

退出的实现

  1. 主页中添加退出链接
<a href="/signOut">退出</a>
  1. 配置 MerryyouSecurityConfig
......
				.and()
                .logout()
                .logoutUrl("/signOut")//自定义退出的地址
                .logoutSuccessUrl("/register")//退出之后跳转到注册页面
                .deleteCookies("JSESSIONID")//删除当前的JSESSIONID
                .and()
......

效果如下

user-gold-cdn.xitu.io/2018/1/18/1…

源码分析

LogoutFilter#doFilter

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		//#1.匹配到/logout请求
		if (requiresLogout(request, response)) {
			Authentication auth = SecurityContextHolder.getContext().getAuthentication();

			if (logger.isDebugEnabled()) {
				logger.debug("Logging out user '" + auth
						+ "' and transferring to logout destination");
			}
			//#2.处理1-4步
			this.handler.logout(request, response, auth);
			//#3.重定向到注册界面
			logoutSuccessHandler.onLogoutSuccess(request, response, auth);

			return;
		}

		chain.doFilter(request, response);
	}
  1. 匹配当前拦截的请求
  2. 处理 清空 Cookieremember-mesessionSecurityContext
  3. 重定向到登录界面

handler

user-gold-cdn.xitu.io/2018/1/18/1…
  1. CookieClearingLogoutHandler 清空 Cookie
  2. PersistentTokenBasedRememberMeServices 清空 remember-me
  3. SecurityContextLogoutHandler 使当前 session 无效,清空当前的 SecurityContext

CookieClearingLogoutHandler#logout

public void logout(HttpServletRequest request, HttpServletResponse response,
			Authentication authentication) {
		for (String cookieName : cookiesToClear) {
			//# 1.Cookie置为null
			Cookie cookie = new Cookie(cookieName, null);
			String cookiePath = request.getContextPath();
			if (!StringUtils.hasLength(cookiePath)) {
				cookiePath = "/";
			}
			cookie.setPath(cookiePath);
			cookie.setMaxAge(0);
			response.addCookie(cookie);
		}
	}
  1. Cookie 置为null

PersistentTokenBasedRememberMeServices#logout

public void logout(HttpServletRequest request, HttpServletResponse response,
			Authentication authentication) {
		super.logout(request, response, authentication);

		if (authentication != null) {
			//#1.清空persistent_logins表中记录
			tokenRepository.removeUserTokens(authentication.getName());
		}
	}
  1. 清空persistent_logins表中记录

SecurityContextLogoutHandler#logout

public void logout(HttpServletRequest request, HttpServletResponse response,
			Authentication authentication) {
		Assert.notNull(request, "HttpServletRequest required");
		if (invalidateHttpSession) {
			HttpSession session = request.getSession(false);
			if (session != null) {
				logger.debug("Invalidating session: " + session.getId());
				//#1.使当前session失效
				session.invalidate();
			}
		}

		if (clearAuthentication) {
			SecurityContext context = SecurityContextHolder.getContext();
			//#2.清空当前的`SecurityContext`
			context.setAuthentication(null);
		}

		SecurityContextHolder.clearContext();
	}
  1. 使当前session失效
  2. 清空当前的 SecurityContext

AbstractAuthenticationTargetUrlRequestHandler#handle

protected void handle(HttpServletRequest request, HttpServletResponse response,
			Authentication authentication) throws IOException, ServletException {
		//#1.获取配置的跳转地址
		String targetUrl = determineTargetUrl(request, response);

		if (response.isCommitted()) {
			logger.debug("Response has already been committed. Unable to redirect to "
					+ targetUrl);
			return;
		}
		//#2.跳转请求
		redirectStrategy.sendRedirect(request, response, targetUrl);
	}
  1. 获取配置的跳转地址
  2. 跳转请求

以上就是本文的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

High Performance Python

High Performance Python

Micha Gorelick、Ian Ozsvald / O'Reilly Media / 2014-9-10 / USD 39.99

If you're an experienced Python programmer, High Performance Python will guide you through the various routes of code optimization. You'll learn how to use smarter algorithms and leverage peripheral t......一起来看看 《High Performance Python》 这本书的介绍吧!

JSON 在线解析
JSON 在线解析

在线 JSON 格式化工具

SHA 加密
SHA 加密

SHA 加密工具

Markdown 在线编辑器
Markdown 在线编辑器

Markdown 在线编辑器