續上篇---shiro從數據庫獲取動態權限-cjq

個人覺得，上篇中講到的注解的方式來控制方法的訪問權限並沒有那么靈活，且需要在代碼中硬編碼，復用性不高，移植會很麻煩，故研究了下從數據庫中動態加載權限

即shiro.xml中的ShiroFilterFactoryBean，之前是直接加載apache源碼的bean：<bean id="shiroFilter" class="cn.cjq.util.shiro.ShiroPermissionFactory">

現在做出以下自定義shiro的filter   該bean繼承ShiroPermissionFactory，重寫父類的setFilterChainDefinitions(java.lang.String definitions)方法

首先來看ShiroPermissionFactory源碼，配置文件中的property 都是在為ShiroPermissionFactory屬性賦值

源碼部分：

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  // IntelliJ API Decompiler stub source generated from a class file
  // Implementation of methods is not available

package org.apache.shiro.spring.web;

public class ShiroFilterFactoryBean implements org.springframework.beans.factory.FactoryBean, org.springframework.beans.factory.config.BeanPostProcessor {
    private static final transient org.slf4j.Logger log;
    private org.apache.shiro.mgt.SecurityManager securityManager;
    private java.util.Map<java.lang.String,javax.servlet.Filter> filters;
    private java.util.Map<java.lang.String,java.lang.String> filterChainDefinitionMap;
    private java.lang.String loginUrl;
    private java.lang.String successUrl;
    private java.lang.String unauthorizedUrl;
    private org.apache.shiro.web.servlet.AbstractShiroFilter instance;

    public ShiroFilterFactoryBean() { /* compiled code */ }

    public org.apache.shiro.mgt.SecurityManager getSecurityManager() { /* compiled code */ }

    public void setSecurityManager(org.apache.shiro.mgt.SecurityManager securityManager) { /* compiled code */ }

    public java.lang.String getLoginUrl() { /* compiled code */ }

    public void setLoginUrl(java.lang.String loginUrl) { /* compiled code */ }

    public java.lang.String getSuccessUrl() { /* compiled code */ }

    public void setSuccessUrl(java.lang.String successUrl) { /* compiled code */ }

    public java.lang.String getUnauthorizedUrl() { /* compiled code */ }

    public void setUnauthorizedUrl(java.lang.String unauthorizedUrl) { /* compiled code */ }

    public java.util.Map<java.lang.String,javax.servlet.Filter> getFilters() { /* compiled code */ }

    public void setFilters(java.util.Map<java.lang.String,javax.servlet.Filter> filters) { /* compiled code */ }

    public java.util.Map<java.lang.String,java.lang.String> getFilterChainDefinitionMap() { /* compiled code */ }

    public void setFilterChainDefinitionMap(java.util.Map<java.lang.String,java.lang.String> filterChainDefinitionMap) { /* compiled code */ }

    public void setFilterChainDefinitions(java.lang.String definitions) { /* compiled code */ }

    public java.lang.Object getObject() throws java.lang.Exception { /* compiled code */ }

    public java.lang.Class getObjectType() { /* compiled code */ }

    public boolean isSingleton() { /* compiled code */ }

    protected org.apache.shiro.web.filter.mgt.FilterChainManager createFilterChainManager() { /* compiled code */ }

    protected org.apache.shiro.web.servlet.AbstractShiroFilter createInstance() throws java.lang.Exception { /* compiled code */ }

    private void applyLoginUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }

    private void applySuccessUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }

    private void applyUnauthorizedUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }

    private void applyGlobalPropertiesIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }

    public java.lang.Object postProcessBeforeInitialization(java.lang.Object bean, java.lang.String beanName) throws org.springframework.beans.BeansException { /* compiled code */ }

    public java.lang.Object postProcessAfterInitialization(java.lang.Object bean, java.lang.String beanName) throws org.springframework.beans.BeansException { /* compiled code */ }

    private static final class SpringShiroFilter extends org.apache.shiro.web.servlet.AbstractShiroFilter {
        protected SpringShiroFilter(org.apache.shiro.web.mgt.WebSecurityManager webSecurityManager, org.apache.shiro.web.filter.mgt.FilterChainResolver resolver) { /* compiled code */ }
    }
}------------------------------------------------------------------------------------------------------------------------------------------------

shiro.xml配置部分內容
<!-- 自定義shiro的filter -->
<bean id="shiroFilter" class="cn.cjq.util.shiro.ShiroPermissionFactory">
   <property name="securityManager" ref="securityManager"/>
   <property name="loginUrl" value="/login/toLogin.do"/>
   <property name="unauthorizedUrl" value="/login/403.do"/>
   <property name="filters">
      <map>
         <entry key="authc" value-ref="formAuthenticationFilter"/>
      </map>
   </property>
   <property name="filterChainDefinitions">     //該部分的值被重寫，部分數據從數據庫加載
      <value>
         /login/**=anon
         /api/** = authc
         /main.do = authc
      </value>
   </property>
</bean>
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自定義的shiro攔截器ShiroPermissionFactory

package cn.cjq.util.shiro;
import cn.cjq.entity.Menu;
import cn.cjq.service.user.UserService;
import org.apache.shiro.config.Ini;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.util.CollectionUtils;
import org.apache.shiro.web.config.IniFilterChainResolverFactory;
import javax.annotation.Resource;
import java.util.List;

public class ShiroPermissionFactory extends ShiroFilterFactoryBean {

    /**配置中的過濾鏈*/
    public static String definitions;

    /**權限service*/
    @Resource
    private UserService userServiceImpl;

    /**
     * 從數據庫動態讀取權限
     */
    @Override
    public void setFilterChainDefinitions(String definitions) {
        ShiroPermissionFactory.definitions = definitions;

        //數據庫動態權限
        List<Menu> Menulist= null;
        try {
            Menulist = userServiceImpl.ListMenu();
        } catch (Exception e) {
            e.printStackTrace();
        }
//拼接所有請求（即url）所需要的權限（認證，權限ID），拼接時必須加入\n用來換行，否則無效。
        for(Menu menu : Menulist){
            //字符串拼接權限
            definitions = definitions+menu.getUrl() + " = "+"authc,perms["+menu.getMenuid()+"]\n";
        }

        //從配置文件加載權限配置
        Ini ini = new Ini();
        ini.load(definitions);
        Ini.Section section = ini.getSection(IniFilterChainResolverFactory.URLS);
        if (CollectionUtils.isEmpty(section)) {
            section = ini.getSection(Ini.DEFAULT_SECTION_NAME);
        }

        //加入權限集合
        setFilterChainDefinitionMap(section);
    }

    /**
     * 從數據庫動態加載權限
     */
//     public ShiroFilterFactoryBean getShiroFilterFactoryBean() {
//        ShiroFilterFactoryBean shiroFilterFactoryBean=null;
//        try {
//            shiroFilterFactoryBean = new MyShiroFilterFactoryBean();
//            //下列屬性在配置文件中已配置
////            shiroFilterFactoryBean.setSecurityManager(getDefaultWebSecurityManager());
////            shiroFilterFactoryBean.setLoginUrl("/login");
////            shiroFilterFactoryBean.setSuccessUrl("/index.html");
////            shiroFilterFactoryBean.setUnauthorizedUrl("/403");
//            loadShiroFilterChain(shiroFilterFactoryBean);
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//        return shiroFilterFactoryBean;
//    }
//
//    private void loadShiroFilterChain(ShiroFilterFactoryBean shiroFilterFactoryBean) throws Exception {
//        List<Menu> Menulist = userServiceImpl.ListMenu();
//        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();
//        for (Menu menu : Menulist) {
//            filterChainDefinitionMap.put(menu.getUrl(),"authc,perms["+menu.getMenuid()+"]");
//        }
//        //配置文件中已配置
////        filterChainDefinitionMap.put("/login", "anon");
//        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
//    }
}

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上述列出的是所有url所需的相對應權限ID，下面是自定義realm中的授權信息，列出當前用戶所有的權限ID，通過比較是否存在權限問題。(也可通過角色去比較，暫不做說明)

/**
    * 授權信息
    */
   @Override
   protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
      String username = (String)principals.getPrimaryPrincipal();
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
//    UserService userService = (UserService) SpringContextUtil.getBean("userServiceImpl");
        try {
         authorizationInfo.setRoles(userMapper.findUserRoles(username));
         authorizationInfo.setStringPermissions(userMapper.findUserPermissions(username));
      } catch (Exception e) {

         e.printStackTrace();
      }
      return authorizationInfo;
   }

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根據當前用戶獲取所有權限ID：也可以不根據權限ID，使用別的也可，但必須統一，既然是使用了權限ID，所有查詢結果返回權限ID即可

<!-- 根據用戶名查詢獲取權限列表ID -->
<select id="findUserPermissions" resultType="java.lang.String" parameterType="java.lang.String" >
  SELECT
  m.menuId
  FROM  mif_user u
  LEFT JOIN mif_role_user_ref ur ON u.uerId=ur.userId
  LEFT JOIN mif_role r ON r.roleId=ur.roleId
  LEFT JOIN mif_role_authority_ref ar ON ar.roleId=r.roleId
  LEFT JOIN mif_authority a ON a.authorityId=ar.authorityId
  LEFT JOIN mif_authotity_menu_ref mr ON mr.authorityId=ar.authorityId
  LEFT JOIN mif_menu m ON m.menuId=mr.menuId
  WHERE  u.isdelete = 0 AND r.isdelete=0 AND a.isdelete=0 AND m.isdelete=0 AND u.userName = #{0}
</select>

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坑1：上述標紅的\n未使用，無效果
坑2：在初始化靜態攔截的時候存在初始值/person/**= authc，即/person下的所有方法只要通過認證即可請求。但是shiro權限中數據庫的動態數據也包含了/person下的方法，是無效的，原因
是自定義的shiro的filter先加載配置文件中的數據，再加載數據庫動態數據，存在/person/**= authc在前面時會讓部分數據庫/person下的url失效，注釋掉/person/**= authc即可

 <property name="filterChainDefinitions">     //該部分的值被重寫，部分數據從數據庫加載
      <value>
         /login/**=anon
         /api/** = authc
         /main.do = authc
         /person/**= authc
      </value>
   </property>
坑3：該bean只會在系統啟動時加載一次，之后不會調用，所有存在任何權限上的變動時，需手動調用setFilterChainDefinitions()方法
PS：要記住在增刪改權限數據庫時記得調用setFilterChainDefinitions（）方法重新加載
相關url：http://blog.csdn.net/u010351766/article/details/70432227