這章繼續擴展功能，來一個“記住我”的功能實現，就是說用戶在登錄一次以后，系統會記住這個用戶一段時間，這段時間內用戶不需要重新登錄就可以使用系統。

記住我功能基本原理

原理說明

用戶登錄發送認證請求的時候會被UsernamePasswordAuthenticationFilter認證攔截，認證成功以后會調用一個RememberMeService服務，服務里面有一個TokenRepository，這個服務會生成一個Token，然后將Token寫入到瀏覽器的Cookie同時會使用TokenRepository把生成的Token寫到數據庫里面，因為這個動作是在認證成功以后做的，所以在Token寫入數據庫的時候會把用戶名同時寫入數據庫。 假如瀏覽器關了重新訪問系統，用戶不需要再次登錄就可以訪問，這個時候請求在過濾器鏈上會經過RememberMeAuthenticationFilter，這個過濾器的作用是讀取Cookie中的Token交給RemeberMeService，RemeberMeService會用TokenRepository到數據庫里去查這個Token在數據庫里有沒有記錄，如果有記錄就會把用戶名取出來，取出來以后會進行各種校驗然后生成新Token再調用之前的UserDetailService，去獲取用戶的信息，然后把用戶信息放到SecurityContext里面，到這里就把用戶給登錄上了。

圖解說明

RememberMeAuthenticationFilter位于過濾器鏈的哪一環？

圖解

首先其他認證過濾器會先進行認證，當其他過濾器都無法認證時，RememberMeAuthenticationFilter會嘗試去做認證。

記住我功能具體實現

前端頁面

登錄的時候加上一行記住我的勾選按鈕，這里要注意，name一定要是remember-me，下面源碼部分會提到。

<tr><td colspan=’2’><input name='remember-me' type='checkbox' value='true' />記住我</td></tr>

后臺

首先配置TokenRepositoryBean

/** * 記住我功能的Token存取器配置 * * @return */@Beanpublic PersistentTokenRepository persistentTokenRepository() {JdbcTokenRepositoryImpl tokenRepository = new JdbcTokenRepositoryImpl();tokenRepository.setDataSource(dataSource);// 啟動的時候自動創建表，建表語句 JdbcTokenRepositoryImpl 已經都寫好了tokenRepository.setCreateTableOnStartup(true);return tokenRepository;}

然后需要在 configure 配置方法那邊進行記住我功能所有組件的配置

protected void configure(HttpSecurity http) throws Exception {ValidateCodeFilter validateCodeFilter = new ValidateCodeFilter();http.addFilterBefore(validateCodeFilter, UsernamePasswordAuthenticationFilter.class).formLogin().loginPage('/authentication/require').loginProcessingUrl('/authentication/form').successHandler(meicloudAuthenticationSuccessHandler).failureHandler(meicloudAuthenticationFailureHandler)// 配置記住我功能.and().rememberMe()// 配置TokenRepository.tokenRepository(persistentTokenRepository())// 配置Token過期時間.tokenValiditySeconds(3600)// 最終拿到用戶名之后，使用UserDetailsService去做登錄.userDetailsService(userDetailsService).and().authorizeRequests().antMatchers('/authentication/require', securityProperties.getBrowser().getSignInPage(), '/code/image').permitAll().anyRequest().authenticated().and().csrf().disable();}

記住我功能Spring Security源碼解析

登錄之前“記住我”源碼流程

在認證成功之后，會調用successfulAuthentication方法（這些第五章源碼部分已經學習過），在將認證信息保存到Context后，RememberMeServices就會調用它的loginSuccess方法。

protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException { if (this.logger.isDebugEnabled()) { this.logger.debug('Authentication success. Updating SecurityContextHolder to contain: ' + authResult); } SecurityContextHolder.getContext().setAuthentication(authResult); this.rememberMeServices.loginSuccess(request, response, authResult); if (this.eventPublisher != null) { this.eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(authResult, this.getClass())); } this.successHandler.onAuthenticationSuccess(request, response, authResult); }

loginSuccess方法里面會先檢查請求中是否有name為remember-me的參數，有才進行下一步。

public final void loginSuccess(HttpServletRequest request, HttpServletResponse response, Authentication successfulAuthentication) { // this.parameter = 'remember-me' if (!this.rememberMeRequested(request, this.parameter)) { this.logger.debug('Remember-me login not requested.'); } else { this.onLoginSuccess(request, response, successfulAuthentication); } }

再進入onLoginSuccess方法，里面主要就是進行寫庫和寫Cookie的操作。

protected void onLoginSuccess(HttpServletRequest request, HttpServletResponse response, Authentication successfulAuthentication) { String username = successfulAuthentication.getName(); this.logger.debug('Creating new persistent login for user ' + username); // 生成Token PersistentRememberMeToken persistentToken = new PersistentRememberMeToken(username, this.generateSeriesData(), this.generateTokenData(), new Date()); try { // 將Token和userName插入數據庫 this.tokenRepository.createNewToken(persistentToken); // 將Token寫到Cookie中 this.addCookie(persistentToken, request, response); } catch (Exception var7) { this.logger.error('Failed to save persistent token ', var7); } }

登錄之后“記住我”源碼流程

首先會進入RememberMeAuthenticationFilter，會先判斷前面的過濾器是否進行過認證（Context中是否有認證信息），未進行過認證的話會調用RememberMeServices的autoLogin方法。

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest)req; HttpServletResponse response = (HttpServletResponse)res; if (SecurityContextHolder.getContext().getAuthentication() == null) { Authentication rememberMeAuth = this.rememberMeServices.autoLogin(request, response); if (rememberMeAuth != null) { try { rememberMeAuth = this.authenticationManager.authenticate(rememberMeAuth); SecurityContextHolder.getContext().setAuthentication(rememberMeAuth); this.onSuccessfulAuthentication(request, response, rememberMeAuth); if (this.logger.isDebugEnabled()) { this.logger.debug('SecurityContextHolder populated with remember-me token: ’' + SecurityContextHolder.getContext().getAuthentication() + '’'); } if (this.eventPublisher != null) { this.eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(SecurityContextHolder.getContext().getAuthentication(), this.getClass())); } if (this.successHandler != null) { this.successHandler.onAuthenticationSuccess(request, response, rememberMeAuth); return; } } catch (AuthenticationException var8) { if (this.logger.isDebugEnabled()) { this.logger.debug('SecurityContextHolder not populated with remember-me token, as AuthenticationManager rejected Authentication returned by RememberMeServices: ’' + rememberMeAuth + '’; invalidating remember-me token', var8); } this.rememberMeServices.loginFail(request, response); this.onUnsuccessfulAuthentication(request, response, var8); } } chain.doFilter(request, response); } else { if (this.logger.isDebugEnabled()) { this.logger.debug('SecurityContextHolder not populated with remember-me token, as it already contained: ’' + SecurityContextHolder.getContext().getAuthentication() + '’'); } chain.doFilter(request, response); } }

autoLogin方法里面，主要調用this.processAutoLoginCookie(cookieTokens, request, response)這個方法獲取數據庫中的用戶信息，其步驟是：

解析前端傳來的Cookie，里面包含了Token和seriesId，它會使用seriesId查找數據庫的Token 檢查Cookie中的Token和數據庫查出來的Token是否一樣 一樣的話再檢查數據庫中的Token是否已過期 如果以上都符合的話，會使用舊的用戶名和series重新new一個Token，這時過期時間也重新刷新 然后將新的Token保存回數據庫，同時添加回Cookie中 最后再調用UserDetailsService的loadUserByUsername方法返回UserDetails

protected UserDetails processAutoLoginCookie(String[] cookieTokens, HttpServletRequest request, HttpServletResponse response) { if (cookieTokens.length != 2) { throw new InvalidCookieException('Cookie token did not contain 2 tokens, but contained ’' + Arrays.asList(cookieTokens) + '’'); } else { String presentedSeries = cookieTokens[0]; String presentedToken = cookieTokens[1]; PersistentRememberMeToken token = this.tokenRepository.getTokenForSeries(presentedSeries); if (token == null) { throw new RememberMeAuthenticationException('No persistent token found for series id: ' + presentedSeries); } else if (!presentedToken.equals(token.getTokenValue())) { this.tokenRepository.removeUserTokens(token.getUsername()); throw new CookieTheftException(this.messages.getMessage('PersistentTokenBasedRememberMeServices.cookieStolen', 'Invalid remember-me token (Series/token) mismatch. Implies previous cookie theft attack.')); } else if (token.getDate().getTime() + (long)this.getTokenValiditySeconds() * 1000L < System.currentTimeMillis()) { throw new RememberMeAuthenticationException('Remember-me login has expired'); } else { if (this.logger.isDebugEnabled()) { this.logger.debug('Refreshing persistent login token for user ’' + token.getUsername() + '’, series ’' + token.getSeries() + '’'); } PersistentRememberMeToken newToken = new PersistentRememberMeToken(token.getUsername(), token.getSeries(), this.generateTokenData(), new Date()); try { this.tokenRepository.updateToken(newToken.getSeries(), newToken.getTokenValue(), newToken.getDate()); this.addCookie(newToken, request, response); } catch (Exception var9) { this.logger.error('Failed to update token: ', var9); throw new RememberMeAuthenticationException('Autologin failed due to data access problem'); } return this.getUserDetailsService().loadUserByUsername(token.getUsername()); } } }

回到RememberMeAuthenticationFilter，在調用了autoLogin方法之后得到了rememberMeAuth，然后再對其進行一個認證，認證成功之后保存到SecurityContext中，至此整個RememberMe自動登錄流程源碼結束。

相關閱讀：

Spring Security實現圖形驗證碼登錄

Spring Security實現短信驗證碼登錄

總結

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