Yii中srbac权限扩展模块工作原理与用法分析

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';

class ProductController extends SBaseController
{
    ........
}
class SBaseController extends Controller
{
    ........
}

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;
 }
}

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;
}

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;
}

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;
}

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