(四)SSO之CAS框架单点登录,自定义验证登录方式

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=result[1];
}  

</script>  

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 xx 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;
    }
}