参考文档:http://denger.iteye.com/blog/809170
http://denger.iteye.com/blog/1119233
首先,在我们的子系统中应该有一个登录页面,通过输入用户名和密码提交至cas认证中心。不过前提是先要获取到 login tickt id. 也就是说当用户第一次进入子系统的登录页面时,在该页面中会通过js跳转到 cas/login 中的获取login ticket. 在 cas/login 的 flow 中先会判断请求的参数中是否包含了 get-lt 的参数。
(1) 在cas的 login flow 中加入 ProvideLoginTicketAction 的流,主要用于判断该请求是否是来获取 lt,在cas-server端声明获取 login ticket action 类:
org.jasig.cas.util.ProvideLoginTicketAction
public class ProvideLoginTicketAction extends AbstractAction{
@Override
protected Event doExecute(RequestContext context) throws Exception {
final HttpServletRequest request = WebUtils.getHttpServletRequest(context);
if (request.getParameter("get-lt") != null && request.getParameter("get-lt").equalsIgnoreCase("true")) {
return result("loginTicketRequested");
}
return result("continue");
}
}
(2) 并且将该 action 声明在 cas-servlet.xml 中:
<bean id="provideLoginTicketAction" class="com.denger.sso.web.ProvideLoginTicketAction" />
(3) 还需要定义 loginTicket 的生成页也就是当返回 loginTicketRequested 的 view:
viewRedirectToRequestor.jsp
var _loginTicket = '${flowExecutionKey}';
(4) 并且需要将该 jsp 声明在 default_views.properites 中:
### Redirect with login ticket view
casRedirectToRequestorView.(class)=org.springframework.web.servlet.view.JstlView
casRedirectToRequestorView.url=/WEB-INF/view/jsp/default/ui/viewRedirectToRequestor.jsp
(5) 接下来要做的就是将该action 的处理加入到 login-webflow.xml 请求流中:
<on-start>
<evaluate expression="initialFlowSetupAction" />
</on-start>
<!-- 添加如下配置 :-->
<action-state id="provideLoginTicket">
<evaluate expression="provideLoginTicketAction"/>
<transition on="loginTicketRequested" to ="viewRedirectToRequestor" />
<transition on="continue" to="ticketGrantingTicketExistsCheck" />
</action-state>
<view-state id="viewRedirectToRequestor" view="casRedirectToRequestorView" model="credentials">
<var name="credentials" class="org.jasig.cas.authentication.principal.UsernamePasswordCredentials" />
<binder>
<binding property="username" />
<binding property="password" />
</binder>
<on-entry>
<set name="viewScope.commandName" value="'credentials'" />
</on-entry>
<transition on="submit" bind="true" validate="true" to="realSubmit">
<set name="flowScope.credentials" value="credentials" />
<evaluate expression="authenticationViaFormAction.doBind(flowRequestContext, flowScope.credentials)" />
</transition>
</view-state>
<!---添加结束处 --->
<decision-state id="ticketGrantingTicketExistsCheck">
<if test="flowScope.ticketGrantingTicketId neq null" then="hasServiceCheck" else="gatewayRequestCheck" />
</decision-state>
(6)登录表单:
<form action="http://www.passport.com:8080/cas/login" method="post" onsubmit="return loginValidate();" target="ssoLoginFrame">
<ul>
<span class="red" style="height:12px;" id="J_ErrorMsg"></span>
<li>
<em>用户名:</em>
<input name="username" id="J_Username" type="text" class="line" style="width: 180px" />
</li>
<li>
<em>密码:</em>
<input name="password" type="password" id="J_Password" class="line" style="width: 180px" />
</li>
<li class="mai">
<em> </em>
<input type="checkbox" name="rememberMe" id="rememberMe" value="true"/>
自动登录
<a href="/retrieve">忘记密码?</a>
</li>
<li>
<em> </em>
<input type="hidden" name="isajax" value="true" />
<input type="hidden" name="isframe" value="true" />
<input type="hidden" name="lt" value="" id="J_LoginTicket">
<input type="hidden" name="_eventId" value="submit" />
<input name="" type="submit" value="登录" class="loginbanner" />
</li>
</ul>
</form>
Js代码
$(document).ready(function(){
flushLoginTicket(); // 进入登录页,则获取login ticket,该函数在下面定义。
});
(7) 输入用户名密码,提交验证。将表单信息将会被POST提交至动态的iframe中,定义该登录页面中登录后的处理逻辑。
// 登录验证函数, 由 onsubmit 事件触发
var loginValidate = function(){
var msg;
if ($.trim($('#J_Username').val()).length == 0 ){
msg = "用户名不能为空。";
} else if ($.trim($('#J_Password').val()).length == 0 ){
msg = "密码不能为空。";
}
if (msg && msg.length > 0) {
$('#J_ErrorMsg').fadeOut().text(msg).fadeIn();
return false;
// Can't request the login ticket.
} else if ($('#J_LoginTicket').val().length == 0){
$('#J_ErrorMsg').text('服务器正忙,请稍后再试..');
return false;
} else {
// 验证成功后,动态创建用于提交登录的 iframe
$('body').append($('').attr({
style: "display:none;width:0;height:0",
id: "ssoLoginFrame",
name: "ssoLoginFrame",
src: "javascript:false;"
}));
return true;
}
}
// 登录处理回调函数,将由 iframe 中的页同自动回调
var feedBackUrlCallBack = function (result) {
customLoginCallBack(result);
deleteIFrame('#ssoLoginFrame');// 删除用完的iframe,但是一定不要在回调前删除,Firefox可能有问题的
};
// 自定义登录回调逻辑
var customLoginCallBack = function(result){
// 登录失败,显示错误信息
if (result.login == 'fails'){
$('#J_ErrorMsg').fadeOut().text(result.msg).fadeIn();
// 重新刷新 login ticket
flushLoginTicket();
}
// do more....
}
var deleteIFrame = function (iframeName) {
var iframe = $(iframeName);
if (iframe) { // 删除用完的iframe,避免页面刷新或前进、后退时,重复执行该iframe的请求
iframe.remove()
}
};
// 由于一个 login ticket 只允许使用一次, 当每次登录需要调用该函数刷新 lt
var flushLoginTicket = function(){
var _services = 'service=' + encodeURIComponent('http://www.portal.com:8080/uc/');
$.getScript('http://www.passport.com:8080/cas/login?'+_services+'&get-lt=true&n='
+ new Date().getTime(),
function(){
// 将返回的 _loginTicket 变量设置到 input name="lt" 的value中。
$('#J_LoginTicket').val(_loginTicket);
});
// Response Example:
// var _loginTicket = 'e1s1';
}
(8) 调整 CAS Server端,使其适应 Iframe 方式登录,并使其支持回调。
打开 login-webflow.xml,找到 的 Flow-Action 配置项:
<!--当执行到该 action 的时候,表示已经登录成功,将生成 ST(Service Ticket)。-->
<action-state id="generateServiceTicket">
<evaluate expression="generateServiceTicketAction" />
<!--当生成 ST 成功后,则进入登录成功页,新增 loginResponse Action 处理项,判断是否是 ajax/iframe 登录 -->
<!-- <transition on="success" to="warn" /> -->
<transition on="success" to="loginResponse" />
<!--<transition on="error" to="viewLoginForm" />-->
<!-- 可能生成 service ticket 失败,同样,也是进入 loginResponse -->
<transition on="error" to="loginResponse" />
<transition on="gateway" to="redirect" />
</action-state>
再新增 loginResponse Action配置项:
<action-state id="loginResponse">
<evaluate expression="ajaxLoginServiceTicketAction" />
<!--非ajax/iframe方式登录,采取原流程处理 -->
<transition on="success" to="warn" />
<transition on="error" to="viewLoginForm" />
<!-- 反之,则进入 viewAjaxLoginView 页面 -->
<transition on="local" to="viewAjaxLoginView" />
</action-state>
再调整,当验证失败后,也需要判断是否是 iframe/ajax登录:
<action-state id="realSubmit">
<evaluate
expression="authenticationViaFormAction.submit(flowRequestContext, flowScope.credentials, messageContext)" />
<transition on="warn" to="warn" />
<transition on="success" to="sendTicketGrantingTicket" />
<!--将 to="viewLoginForm" 修改为 to="loginResponse" -->
<transition on="error" to="loginResponse" />
</action-state>
还需要配置 viewAjaxLoginView 的 state:
<end-state id="viewAjaxLoginView" view="viewAjaxLoginView" />
接着,再定义 ajaxLoginServiceTicketAction Bean 吧,直接在 cas-servlet.xml 声明该 bean:
<bean id="ajaxLoginServiceTicketAction" class="org.jasig.cas.util.AjaxLoginServiceTicketAction"/>
Java代码:
package org.jasig.cas.util;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang.BooleanUtils;
import org.apache.commons.lang.StringUtils;
import org.jasig.cas.authentication.principal.Service;
import org.jasig.cas.web.support.WebUtils;
import org.springframework.webflow.action.AbstractAction;
import org.springframework.webflow.execution.Event;
import org.springframework.webflow.execution.RequestContext;
public final class AjaxLoginServiceTicketAction extends AbstractAction {
// The default call back function name.
protected static final String J_CALLBACK = "feedBackUrlCallBack";
protected Event doExecute(final RequestContext context) {
HttpServletRequest request = WebUtils.getHttpServletRequest(context);
Event event = context.getCurrentEvent();
boolean isAjax = BooleanUtils.toBoolean(request.getParameter("isajax"));
if (!isAjax){ // 非 ajax/iframe 方式登录,返回当前 event.
return event;
}
boolean isLoginSuccess;
// Login Successful.
if ("success".equals(event.getId())){ //是否登录成功
final Service service = WebUtils.getService(context);
final String serviceTicket = WebUtils.getServiceTicketFromRequestScope(context);
if (service != null){ //设置登录成功之后 跳转的地址
request.setAttribute("service", service.getId());
}
request.setAttribute("ticket", serviceTicket);
isLoginSuccess = true;
} else { // Login Fails..
isLoginSuccess = false;
}
boolean isFrame = BooleanUtils.toBoolean(request.getParameter("isframe"));
String callback = request.getParameter("callback");
if(StringUtils.isEmpty(callback)){ // 如果未转入 callback 参数,则采用默认 callback 函数名
callback = J_CALLBACK;
}
if(isFrame){ // 如果采用了 iframe ,则 concat 其 parent 。
callback = "parent.".concat(callback);
}
request.setAttribute("isFrame", isFrame);
request.setAttribute("callback", callback);
request.setAttribute("isLogin", isLoginSuccess);
return new Event(this, "local"); // 转入 ajaxLogin.jsp 页面
}
}
最后,再定义一下 view 的页面地址吧,修改 default_views.properties,添加:
viewAjaxLoginView.(class)=org.springframework.web.servlet.view.JstlView
viewAjaxLoginView.url=/WEB-INF/view/jsp/defalut/ui/ajaxLogin.jsp
Html代码:
<%@ page contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>正在登录....</title>
</head>
<body>
<script type="text/javascript">
<%
Boolean isFrame = (Boolean)request.getAttribute("isFrame");
Boolean isLogin = (Boolean)request.getAttribute("isLogin");
// 登录成功
if(isLogin){
if(isFrame){%>
parent.location.replace('${service}?ticket=${ticket}')
<%} else{%>
location.replace('${service}?ticket=${ticket}')
<%}
}
%>
// 回调
${callback}({'login':${isLogin ? '"success"': '"fails"'}, 'msg': ${isLogin ? '""': '"用户名或密码错误!"'}})
</script>
</body>
</html>