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
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); 复制代码 登陆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 复制代码 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() ...... 复制代码 效果如下
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); } 复制代码 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); } 复制代码 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); } } 复制代码 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); ...... 复制代码 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 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; } 复制代码 获取Cookie 解析Cookie 获取用户凭证 检查用户凭证
