CAS 之 实现用户注册后自动登录

转自：http://denger.iteye.com/blog/805743   

1. 关于CAS的介绍不再累述，我想涉及过SSO同学应该都会对该框架所有了解，我们目前项目采用的CAS Server 版本为 3.4.2.1, 其 CAS Client 版本为 3.1.10。

         CAS项目官方：http://www.jasig.org/cas
         本文讲述CAS登录处理未包括 CAS Client 与 Server 端的对 ST 采用SMAL验证的流程。

     2. 对于登录其主要处理流程：
         注册成功后 -> 调用CAS登录处理的相关模块 -> 验证用户名密码 -> 生成TGT -> 生成TG -> Add ST&TGT至相关Register类 -> Add TGT至Cookie -> 重定向至 cas/login URL -> 完成


     3.  CAS 登录处理主要模块(类):
              a. Credentials  用于存储用户登录认证信息接口。
                  其默认实现类：org.jasig.cas.authentication.principal.UsernamePasswordCredentials

              b. CentralAuthenticationService 用于生成 ST(Service Ticket) 和  TGT(TicketGrantingTicket)的认证服务类。
                  其默认实现类： org.jasig.cas.CentralAuthenticationServiceImpl

              c. CookieRetrievingCookieGenerator 用于将TGT添加至Cookie及对Cookie进行管理。


     4.  具体实现代码:

/**
 * user register process and automatic login.
 * @param userForm the user information object.
 * @param request  the HttpServletRequest object
 * @param response the HttpServletResponse object
 * @return get result view
 */
protected ModelAndView handleUserRegisterInternal(UserInfoVo userForm, HttpServletRequest request, HttpServletResponse response) {

    ModelAndView signinView = new ModelAndView(REGISTER_VIEW);;
    final boolean isUnique = userService.checkUserUnique(userForm.getLoginName());
    final boolean isRegistered = isUnique ? registerUser(userForm, request, response) : false;

    if (isRegistered) {
        bindTicketGrantingTicket(userForm.getLoginName(), userForm.getLoginPassword(), request, response);
        signinView.setViewName(getSignInView(request));
    }
    return signinView;
}

          

/**
 * Invoke generate validate Tickets and add the TGT to cookie.
 * @param loginName     the user login name.
 * @param loginPassword the user login password.
 * @param request       the HttpServletRequest object.
 * @param response      the HttpServletResponse object.
 */
protected void bindTicketGrantingTicket(String loginName, String loginPassword, HttpServletRequest request, HttpServletResponse response){
    try {
        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials();
        credentials.setUsername(loginName);
        credentials.setPassword(loginPassword);
        String ticketGrantingTicket = centralAuthenticationService.createTicketGrantingTicket(credentials);
        ticketGrantingTicketCookieGenerator.addCookie(request, response, ticketGrantingTicket);
    } catch (TicketException te) {
        logger.error("Validate the login name " + loginName + " failure, can't bind the TGT!", te);
    } catch (Exception e){
        logger.error("bindTicketGrantingTicket has exception.", e);
    }
}

/**
 * Get the signIn view URL.
 * @param request the HttpServletRequest object.
 * @return redirect URL
 */
protected String getSignInView(HttpServletRequest request) {
    String service = ServletRequestUtils.getStringParameter(request, "service", "");
    return ("redirect:login" + (service.length() > 0 ? "?service=" + service : ""));
}

   
cas-servlet.xml 相关代码：

<bean id="registerController" class="com.xxxxx.sso.web.RegisterController"
    p:userService-ref="userService"
    p:validator-ref="registerValidator"
    p:centralAuthenticationService-ref="centralAuthenticationService"
    p:ticketGrantingTicketCookieGenerator-ref="ticketGrantingTicketCookieGenerator"/>

注： 关于centralAuthenticationService及ticketGrantingTicketCookieGenerator已声明在 spring-configuration/applicationContext.xml 和 ticketGrantingTicketCookieGenerator.xml中