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<?php
/**
* CAuthManager class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CAuthManager is the base class for authorization manager classes.
*
* CAuthManager extends {@link CApplicationComponent} and implements some methods
* that are common among authorization manager classes.
*
* CAuthManager together with its concrete child classes implement the Role-Based
* Access Control (RBAC).
*
* The main idea is that permissions are organized as a hierarchy of
* {@link CAuthItem authorization items}. Items on higer level inherit the permissions
* represented by items on lower level. And roles are simply top-level authorization items
* that may be assigned to individual users. A user is said to have a permission
* to do something if the corresponding authorization item is inherited by one of his roles.
*
* Using authorization manager consists of two aspects. First, the authorization hierarchy
* and assignments have to be established. CAuthManager and its child classes
* provides APIs to accomplish this task. Developers may need to develop some GUI
* so that it is more intuitive to end-users. Second, developers call {@link IAuthManager::checkAccess}
* at appropriate places in the application code to check if the current user
* has the needed permission for an operation.
*
* @property array $roles Roles (name=>CAuthItem).
* @property array $tasks Tasks (name=>CAuthItem).
* @property array $operations Operations (name=>CAuthItem).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web.auth
* @since 1.0
*/
abstract class CAuthManager extends CApplicationComponent implements IAuthManager
{
/**
* @var boolean Enable error reporting for bizRules.
* @since 1.1.3
*/
public $showErrors = false;
/**
* @var array list of role names that are assigned to all users implicitly.
* These roles do not need to be explicitly assigned to any user.
* When calling {@link checkAccess}, these roles will be checked first.
* For performance reason, you should minimize the number of such roles.
* A typical usage of such roles is to define an 'authenticated' role and associate
* it with a biz rule which checks if the current user is authenticated.
* And then declare 'authenticated' in this property so that it can be applied to
* every authenticated user.
*/
public $defaultRoles=array();
/**
* Creates a role.
* This is a shortcut method to {@link IAuthManager::createAuthItem}.
* @param string $name the item name
* @param string $description the item description.
* @param string $bizRule the business rule associated with this item
* @param mixed $data additional data to be passed when evaluating the business rule
* @return CAuthItem the authorization item
*/
public function createRole($name,$description='',$bizRule=null,$data=null)
{
return $this->createAuthItem($name,CAuthItem::TYPE_ROLE,$description,$bizRule,$data);
}
/**
* Creates a task.
* This is a shortcut method to {@link IAuthManager::createAuthItem}.
* @param string $name the item name
* @param string $description the item description.
* @param string $bizRule the business rule associated with this item
* @param mixed $data additional data to be passed when evaluating the business rule
* @return CAuthItem the authorization item
*/
public function createTask($name,$description='',$bizRule=null,$data=null)
{
return $this->createAuthItem($name,CAuthItem::TYPE_TASK,$description,$bizRule,$data);
}
/**
* Creates an operation.
* This is a shortcut method to {@link IAuthManager::createAuthItem}.
* @param string $name the item name
* @param string $description the item description.
* @param string $bizRule the business rule associated with this item
* @param mixed $data additional data to be passed when evaluating the business rule
* @return CAuthItem the authorization item
*/
public function createOperation($name,$description='',$bizRule=null,$data=null)
{
return $this->createAuthItem($name,CAuthItem::TYPE_OPERATION,$description,$bizRule,$data);
}
/**
* Returns roles.
* This is a shortcut method to {@link IAuthManager::getAuthItems}.
* @param mixed $userId the user ID. If not null, only the roles directly assigned to the user
* will be returned. Otherwise, all roles will be returned.
* @return array roles (name=>CAuthItem)
*/
public function getRoles($userId=null)
{
return $this->getAuthItems(CAuthItem::TYPE_ROLE,$userId);
}
/**
* Returns tasks.
* This is a shortcut method to {@link IAuthManager::getAuthItems}.
* @param mixed $userId the user ID. If not null, only the tasks directly assigned to the user
* will be returned. Otherwise, all tasks will be returned.
* @return array tasks (name=>CAuthItem)
*/
public function getTasks($userId=null)
{
return $this->getAuthItems(CAuthItem::TYPE_TASK,$userId);
}
/**
* Returns operations.
* This is a shortcut method to {@link IAuthManager::getAuthItems}.
* @param mixed $userId the user ID. If not null, only the operations directly assigned to the user
* will be returned. Otherwise, all operations will be returned.
* @return array operations (name=>CAuthItem)
*/
public function getOperations($userId=null)
{
return $this->getAuthItems(CAuthItem::TYPE_OPERATION,$userId);
}
/**
* Executes the specified business rule.
* @param string $bizRule the business rule to be executed.
* @param array $params parameters passed to {@link IAuthManager::checkAccess}.
* @param mixed $data additional data associated with the authorization item or assignment.
* @return boolean whether the business rule returns true.
* If the business rule is empty, it will still return true.
*/
public function executeBizRule($bizRule,$params,$data)
{
return $bizRule==='' || $bizRule===null || ($this->showErrors ? eval($bizRule)!=0 : @eval($bizRule)!=0);
}
/**
* Checks the item types to make sure a child can be added to a parent.
* @param integer $parentType parent item type
* @param integer $childType child item type
* @throws CException if the item cannot be added as a child due to its incompatible type.
*/
protected function checkItemChildType($parentType,$childType)
{
static $types=array('operation','task','role');
if($parentType < $childType)
throw new CException(Yii::t('yii','Cannot add an item of type "{child}" to an item of type "{parent}".',
array('{child}'=>$types[$childType], '{parent}'=>$types[$parentType])));
}
}
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