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);
}