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Yii-srbac- 权限扩展模块工作原理


  1. 设置权限规则表:可放在module模块配置文件里面
      public function init() {
        //操作权限表,必须存在以下字段:
        	//itemname角色名/ID,
        	//type授权项目类型/1(任务)或者2(角色),
        	//bizrule权限/逻辑运算表达式为false是有权限操作,
        	//data数据/YII暂无利用
        Yii::app()->authManager->itemTable = 'AuthItem';
        //会员组-权限对应表,必须存在以下字段:
      	//child子角色/ID,
      	//parent父角色/ID,此表可循环执行,可多级继承
        Yii::app()->authManager->itemChildTable = 'uthItemChild';
        //会员-会员组对应表,会员组可直接为操作名称,必须存在以下字段:
        	//itemname角色名/ID,
        	//userid用户名/ID,
        	//bizrule权限/逻辑运算表达式为false是有权限操作,
        	//data数据/YII暂无利用
        Yii::app()->authManager->assignmentTable = 'zd_mem_glog';
    }

  2. 实现规则,所在控制器继承基类SBaseController,原来为Controller
    class ProductController extends SBaseController
    {
           ........
    }
    class SBaseController extends Controller 
    {
            ........
    }

  3. SBaseController继承基类Controller,前填加beforeAction,实现权限验证。
      protected function beforeAction($action) {
      	//载入模块分隔符
        $del = Helper::findModule('srbac')->delimeter;
        
        //取得前模块名称
        $mod = $this->module !== null ? $this->module->id . $del : "";
        
        $contrArr = explode("/", $this->id);
        $contrArr[sizeof($contrArr) - 1] = ucfirst($contrArr[sizeof($contrArr) - 1]);
        $controller = implode(".", $contrArr);
    
        $controller = str_replace("/", ".", $this->id);
        // 生成静态页面 模块+分隔符+控制器(首字母大写)+方法(首字母大写)例: model-ControllerAction
        if(sizeof($contrArr)==1){
          $controller = ucfirst($controller);
        }
        $access = $mod . $controller . ucfirst($this->action->id);
       
        //验证访问页面地址是否在总是允许列表里面,是返回有权限
        if (in_array($access, $this->allowedAccess())) {
          return true;
        }
       
        
        //验证SRBAC有无安装,没在安装,返回的权限访问
        if (!Yii::app()->getModule('srbac')->isInstalled()) {
          return true;
        }
       
        //验证SRBAC有无开启,没在开启,返回的权限访问
        if (Yii::app()->getModule('srbac')->debug) {
          return true;
        }
        
         // 权限验证
        if (!Yii::app()->user->checkAccess($access) || Yii::app()->user->isGuest) {
          $this->onUnauthorizedAccess();
        } else {
          return true;
        }
      }

  4. CDbAuthManager读取当前用户角色
    public function getAuthAssignments($userId)
    {
    	$rows=$this->db->createCommand()
    		->select()
    		->from($this->assignmentTable)
    		->where('userid=:userid', array(':userid'=>$userId))
    		->queryAll();
    	$assignments=array();
    	foreach($rows as $row)
    	{
    		if(($data=@unserialize($row['data']))===false)
    			$data=null;
    		$assignments[$row['itemname']]=new CAuthAssignment($this,$row['itemname'],$row['userid'],$row['bizrule'],$data);
    	}
    	return $assignments;
    }

  5. CDbAuthManager读取角色对应权限
    public function getAuthItem($name)
    {
    	$row=$this->db->createCommand()
    		->select()
    		->from($this->itemTable)
    		->where('name=:name', array(':name'=>$name))
    		->queryRow();
    
    	if($row!==false)
    	{
    		if(($data=@unserialize($row['data']))===false)
    			$data=null;
    		return new CAuthItem($this,$row['name'],$row['type'],$row['description'],$row['bizrule'],$data);
    	}
    	else
    		return null;
    }

  6. CDbAuthManager读取权限对应操作
    protected function checkAccessRecursive($itemName,$userId,$params,$assignments)
    {
    	if(($item=$this->getAuthItem($itemName))===null)
    		return false;
    	Yii::trace('Checking permission "'.$item->getName().'"','system.web.auth.CDbAuthManager');
    	if(!isset($params['userId']))
    	    $params['userId'] = $userId;
    	if($this->executeBizRule($item->getBizRule(),$params,$item->getData()))
    	{
    		if(in_array($itemName,$this->defaultRoles))
    			return true;
    		if(isset($assignments[$itemName]))
    		{
    			$assignment=$assignments[$itemName];
    			if($this->executeBizRule($assignment->getBizRule(),$params,$assignment->getData()))
    				return true;
    		}
    		$parents=$this->db->createCommand()
    			->select('parent')
    			->from($this->itemChildTable)
    			->where('child=:name', array(':name'=>$itemName))
    			->queryColumn();
    		foreach($parents as $parent)
    		{
    			if($this->checkAccessRecursive($parent,$userId,$params,$assignments))
    				return true;
    		}
    	}
    	return false;
    }


  7. CAuthManager验证权限
    public function executeBizRule($bizRule,$params,$data)
    {
        return $bizRule==='' || $bizRule===null || ($this->showErrors ? eval($bizRule)!=0 : @eval($bizRule)!=0);
    } 
    

  8. 总是充许访问规则设置

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