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(四)SSO之CAS框架单点登录,修改验证数据库的方式

       应需求的变化,在登录cas的时候,默认根据用户名和密码进行验证,如果加上用户名,密码和一个系统标识进行验证呢?该如何做呢?

      我们知道cas默认的登录界面中,输入的用户名和密码,再配置一下deployerConfigContext.xml 这个文件中的bean  org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler 的这个标签,写上对应的sql,以及在<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">中配置数据库驱动,数据库名称,以及登陆密码等。

      如果再加上一个其他的验证该怎么做呢?

      1  根据xml中bean标签的提示,很容器找到这个类QueryDatabaseAuthenticationHandler.java类,首先先修改login-webflow.xml,修改代码如下所示:

<binder>            <binding property="username" />            <binding property="password" />	   <binding property="systemId" />        </binder>


      其中<bingding property="systemId" />与界面中传递过来的隐含域一致。

 

      2   casLoginView.jsp中增加的js代码如下所示,从登陆地址的url传递参数。

<script language="javascript"  type="text/javascript"> 	window.onload=function()//用window的onload事件,窗体加载完毕的时候{   //do something   var result = location.search.match(new RegExp("[\?\&]" + 'systemId'+ "=([^\&]+)","i"));  	if(result == null || result.length < 1){   	 result ="";	} 				$("#systemId")[0].value=http://www.mamicode.com/result[1];>


      参登陆页面地址为https://www.cdvcloud.com:8443/cas/login?systemId=vms2.0 ,在第一次登陆界面的时候会携带这两个参数https://www.cdvcloud.com:8443/cas/login?service=http%3A%2F%2F172.16.3.101%3A8080%2Fvms2.0%2Fuser%2FtoMain%2F 其中的一个为我们的自定义的系统标识,第二个为cas验证数据库成功后转到的主界面。

      3   在登录界面中加上了hidden,以此来传递给CAS。

<input type="hidden" name="systemId" id="systemId">

 

      4  修改CAS源代码,UsernamePasswordCredentials.java,代码如下所示。

/* * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license * distributed with this file and available online at * http://www.ja-sig.org/products/cas/overview/license/ */package org.jasig.cas.authentication.principal;import javax.validation.constraints.NotNull;import javax.validation.constraints.Size;/** * UsernamePasswordCredentials respresents the username and password that a user * may provide in order to prove the authenticity of who they say they are. *  * @author Scott Battaglia * @version $Revision: 1.2 $ $Date: 2007/01/22 20:35:26 $ * @since 3.0 * <p> * This is a published and supported CAS Server 3 API. * </p> */public class UsernamePasswordCredentials implements Credentials {    /** Unique ID for serialization. */    private static final long serialVersionUID = -8343864967200862794L;    /** The username. */    @NotNull    @Size(min=1,message = "required.username")    private String username;    /** The password. */    @NotNull    @Size(min=1, message = "required.password")    private String password;	/** The systemId for vms2.0 for sql validate xinghaifang add 2014??7??21??16:12:51. */    @NotNull    @Size(min=1, message = "required.systemId")    private String systemId;	/*systemId  begin*/	/**     * @return Returns the systemId.     */   	public String getSystemId() {		return systemId;	}	public void setSystemId(String systemId) {		this.systemId = systemId;	}     public String toStringSystemId() {        return "[systemId: " + this.systemId + "]";    }	/*end */    /**     * @return Returns the password.     */    public final String getPassword() {        return this.password;    }    /**     * @param password The password to set.     */    public final void setPassword(final String password) {        this.password = password;    }    /**     * @return Returns the userName.     */    public final String getUsername() {        return this.username;    }    /**     * @param userName The userName to set.     */    public final void setUsername(final String userName) {        this.username = userName;    }    public String toString() {        return "[username: " + this.username + "]";    }    @Override    public boolean equals(final Object o) {        if (this == o) return true;        if (o == null || getClass() != o.getClass()) return false;        UsernamePasswordCredentials that = (UsernamePasswordCredentials) o;        if (password != null ? !password.equals(that.password) : that.password != null) return false;        if (username != null ? !username.equals(that.username) : that.username != null) return false;        return true;    }    @Override    public int hashCode() {        int result = username != null ? username.hashCode() : 0;        result = 31 * result + (password != null ? password.hashCode() : 0);        return result;    }}


      除了cas自己的用户名和密码,添加自己的systemId标识。

      5  修改QueryDatabaseAuthenticationHandler.java类 , 代码如下所示。

/* * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license * distributed with this file and available online at * http://www.ja-sig.org/products/cas/overview/license/ */package org.jasig.cas.adaptors.jdbc;import org.jasig.cas.authentication.handler.AuthenticationException;import org.jasig.cas.authentication.principal.UsernamePasswordCredentials;import org.springframework.dao.IncorrectResultSizeDataAccessException;import javax.validation.constraints.NotNull;/** * Class that if provided a query that returns a password (parameter of query * must be username) will compare that password to a translated version of the * password provided by the user. If they match, then authentication succeeds. * Default password translator is plaintext translator. *  * @author Scott Battaglia * @author Dmitriy Kopylenko * @version $Revision$ $Date$ * @since 3.0 */public final class QueryDatabaseAuthenticationHandler extends    AbstractJdbcUsernamePasswordAuthenticationHandler {    @NotNull    private String sql;    protected final boolean authenticateUsernamePasswordInternal(final UsernamePasswordCredentials credentials) throws AuthenticationException {        final String username = getPrincipalNameTransformer().transform(credentials.getUsername());        final String password = credentials.getPassword();		//xx add 2014 7 21  16:27:58 for vms2.0 systemid begin----------		  //final String systemId = credentials.getSystemId();        String mySystemId = credentials.getSystemId();        String[] systemIdGroup=mySystemId.split(",");        String systemId= systemIdGroup[0];		  System.out.println("systemId---------"+systemId+"----------------systemid value");		  //xxadd 2014 7  21   16:27:58 for vms2.0 systemid end----------        final String encryptedPassword = this.getPasswordEncoder().encode(            password);                try {            final String dbPassword = getJdbcTemplate().queryForObject(                this.sql, String.class, username,systemId);            return dbPassword.equals(encryptedPassword);        } catch (final IncorrectResultSizeDataAccessException e) {            // this means the username was not found.            return false;        }    }    /**     * @param sql The sql to set.     */    public void setSql(final String sql) {        this.sql = sql;    }}


      在这过程中学习:

      部署的项目如何调试:当我无法在自己的本地上附上cas源代码,进行断点调试,就只能根据CAS的日志文件来看到底是哪里出的错误,cas的日志文件一大堆,到底是哪个我需要的日志文件,删了刷新看到底哪个文件变化,这都是我需要学习的。

      面对你认为的庞然大物时:第一次接触CAS陌生,根着文档一步一步的做,中间出现一些错误,再不断的改正错误,从CAS一些基本的样式和功能不符合需求的时候,就需要改动CAS源代码了,总是把他捧的高高在上,总是感觉自己触不可及这都是错误的心态;其实当你打开他的源代码,静下心来研究,也会感觉没有什么,和自己的项目又有什么不同呢?换做是自己要开发一个CAS的项目,是怎样的一个思路?

      对CAS的认识:第一次能弄出登录界面,十分兴奋,到后来不断的发现CAS的缺点,不断的需要改动CAS源代码,不断的要替换他的文件,只能说CAS虽然是开源的,有很多我们学习的地方,但我认为对于最好不使用CAS还是不要使用,他的可配置性,灵活性,可扩展性能不是十分的友好,还是慎重选择吧。