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