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<?php
/**
* CDbAuthManager 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/
*/
/**
* CDbAuthManager represents an authorization manager that stores authorization information in database.
*
* The database connection is specified by {@link connectionID}. And the database schema
* should be as described in "framework/web/auth/*.sql". You may change the names of
* the three tables used to store the authorization data by setting {@link itemTable},
* {@link itemChildTable} and {@link assignmentTable}.
*
* @property array $authItems The authorization items of the specific type.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web.auth
* @since 1.0
*/
class CDbAuthManager extends CAuthManager
{
/**
* @var string the ID of the {@link CDbConnection} application component. Defaults to 'db'.
* The database must have the tables as declared in "framework/web/auth/*.sql".
*/
public $connectionID='db';
/**
* @var string the name of the table storing authorization items. Defaults to 'AuthItem'.
*/
public $itemTable='AuthItem';
/**
* @var string the name of the table storing authorization item hierarchy. Defaults to 'AuthItemChild'.
*/
public $itemChildTable='AuthItemChild';
/**
* @var string the name of the table storing authorization item assignments. Defaults to 'AuthAssignment'.
*/
public $assignmentTable='AuthAssignment';
/**
* @var CDbConnection the database connection. By default, this is initialized
* automatically as the application component whose ID is indicated as {@link connectionID}.
*/
public $db;
private $_usingSqlite;
/**
* Initializes the application component.
* This method overrides the parent implementation by establishing the database connection.
*/
public function init()
{
parent::init();
$this->_usingSqlite=!strncmp($this->getDbConnection()->getDriverName(),'sqlite',6);
}
/**
* Performs access check for the specified user.
* @param string $itemName the name of the operation that need access check
* @param mixed $userId the user ID. This should can be either an integer and a string representing
* the unique identifier of a user. See {@link IWebUser::getId}.
* @param array $params name-value pairs that would be passed to biz rules associated
* with the tasks and roles assigned to the user.
* Since version 1.1.11 a param with name 'userId' is added to this array, which holds the value of <code>$userId</code>.
* @return boolean whether the operations can be performed by the user.
*/
public function checkAccess($itemName,$userId,$params=array())
{
$assignments=$this->getAuthAssignments($userId);
return $this->checkAccessRecursive($itemName,$userId,$params,$assignments);
}
/**
* Performs access check for the specified user.
* This method is internally called by {@link checkAccess}.
* @param string $itemName the name of the operation that need access check
* @param mixed $userId the user ID. This should can be either an integer and a string representing
* the unique identifier of a user. See {@link IWebUser::getId}.
* @param array $params name-value pairs that would be passed to biz rules associated
* with the tasks and roles assigned to the user.
* Since version 1.1.11 a param with name 'userId' is added to this array, which holds the value of <code>$userId</code>.
* @param array $assignments the assignments to the specified user
* @return boolean whether the operations can be performed by the user.
* @since 1.1.3
*/
protected function checkAccessRecursive($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;
}
/**
* Adds an item as a child of another item.
* @param string $itemName the parent item name
* @param string $childName the child item name
* @return boolean whether the item is added successfully
* @throws CException if either parent or child doesn't exist or if a loop has been detected.
*/
public function addItemChild($itemName,$childName)
{
if($itemName===$childName)
throw new CException(Yii::t('yii','Cannot add "{name}" as a child of itself.',
array('{name}'=>$itemName)));
$rows=$this->db->createCommand()
->select()
->from($this->itemTable)
->where('name=:name1 OR name=:name2', array(
':name1'=>$itemName,
':name2'=>$childName
))
->queryAll();
if(count($rows)==2)
{
if($rows[0]['name']===$itemName)
{
$parentType=$rows[0]['type'];
$childType=$rows[1]['type'];
}
else
{
$childType=$rows[0]['type'];
$parentType=$rows[1]['type'];
}
$this->checkItemChildType($parentType,$childType);
if($this->detectLoop($itemName,$childName))
throw new CException(Yii::t('yii','Cannot add "{child}" as a child of "{name}". A loop has been detected.',
array('{child}'=>$childName,'{name}'=>$itemName)));
$this->db->createCommand()
->insert($this->itemChildTable, array(
'parent'=>$itemName,
'child'=>$childName,
));
return true;
}
else
throw new CException(Yii::t('yii','Either "{parent}" or "{child}" does not exist.',array('{child}'=>$childName,'{parent}'=>$itemName)));
}
/**
* Removes a child from its parent.
* Note, the child item is not deleted. Only the parent-child relationship is removed.
* @param string $itemName the parent item name
* @param string $childName the child item name
* @return boolean whether the removal is successful
*/
public function removeItemChild($itemName,$childName)
{
return $this->db->createCommand()
->delete($this->itemChildTable, 'parent=:parent AND child=:child', array(
':parent'=>$itemName,
':child'=>$childName
)) > 0;
}
/**
* Returns a value indicating whether a child exists within a parent.
* @param string $itemName the parent item name
* @param string $childName the child item name
* @return boolean whether the child exists
*/
public function hasItemChild($itemName,$childName)
{
return $this->db->createCommand()
->select('parent')
->from($this->itemChildTable)
->where('parent=:parent AND child=:child', array(
':parent'=>$itemName,
':child'=>$childName))
->queryScalar() !== false;
}
/**
* Returns the children of the specified item.
* @param mixed $names the parent item name. This can be either a string or an array.
* The latter represents a list of item names.
* @return array all child items of the parent
*/
public function getItemChildren($names)
{
if(is_string($names))
$condition='parent='.$this->db->quoteValue($names);
else if(is_array($names) && $names!==array())
{
foreach($names as &$name)
$name=$this->db->quoteValue($name);
$condition='parent IN ('.implode(', ',$names).')';
}
$rows=$this->db->createCommand()
->select('name, type, description, bizrule, data')
->from(array(
$this->itemTable,
$this->itemChildTable
))
->where($condition.' AND name=child')
->queryAll();
$children=array();
foreach($rows as $row)
{
if(($data=@unserialize($row['data']))===false)
$data=null;
$children[$row['name']]=new CAuthItem($this,$row['name'],$row['type'],$row['description'],$row['bizrule'],$data);
}
return $children;
}
/**
* Assigns an authorization item to a user.
* @param string $itemName the item name
* @param mixed $userId the user ID (see {@link IWebUser::getId})
* @param string $bizRule the business rule to be executed when {@link checkAccess} is called
* for this particular authorization item.
* @param mixed $data additional data associated with this assignment
* @return CAuthAssignment the authorization assignment information.
* @throws CException if the item does not exist or if the item has already been assigned to the user
*/
public function assign($itemName,$userId,$bizRule=null,$data=null)
{
if($this->usingSqlite() && $this->getAuthItem($itemName)===null)
throw new CException(Yii::t('yii','The item "{name}" does not exist.',array('{name}'=>$itemName)));
$this->db->createCommand()
->insert($this->assignmentTable, array(
'itemname'=>$itemName,
'userid'=>$userId,
'bizrule'=>$bizRule,
'data'=>serialize($data)
));
return new CAuthAssignment($this,$itemName,$userId,$bizRule,$data);
}
/**
* Revokes an authorization assignment from a user.
* @param string $itemName the item name
* @param mixed $userId the user ID (see {@link IWebUser::getId})
* @return boolean whether removal is successful
*/
public function revoke($itemName,$userId)
{
return $this->db->createCommand()
->delete($this->assignmentTable, 'itemname=:itemname AND userid=:userid', array(
':itemname'=>$itemName,
':userid'=>$userId
)) > 0;
}
/**
* Returns a value indicating whether the item has been assigned to the user.
* @param string $itemName the item name
* @param mixed $userId the user ID (see {@link IWebUser::getId})
* @return boolean whether the item has been assigned to the user.
*/
public function isAssigned($itemName,$userId)
{
return $this->db->createCommand()
->select('itemname')
->from($this->assignmentTable)
->where('itemname=:itemname AND userid=:userid', array(
':itemname'=>$itemName,
':userid'=>$userId))
->queryScalar() !== false;
}
/**
* Returns the item assignment information.
* @param string $itemName the item name
* @param mixed $userId the user ID (see {@link IWebUser::getId})
* @return CAuthAssignment the item assignment information. Null is returned if
* the item is not assigned to the user.
*/
public function getAuthAssignment($itemName,$userId)
{
$row=$this->db->createCommand()
->select()
->from($this->assignmentTable)
->where('itemname=:itemname AND userid=:userid', array(
':itemname'=>$itemName,
':userid'=>$userId))
->queryRow();
if($row!==false)
{
if(($data=@unserialize($row['data']))===false)
$data=null;
return new CAuthAssignment($this,$row['itemname'],$row['userid'],$row['bizrule'],$data);
}
else
return null;
}
/**
* Returns the item assignments for the specified user.
* @param mixed $userId the user ID (see {@link IWebUser::getId})
* @return array the item assignment information for the user. An empty array will be
* returned if there is no item assigned to the user.
*/
public function getAuthAssignments($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;
}
/**
* Saves the changes to an authorization assignment.
* @param CAuthAssignment $assignment the assignment that has been changed.
*/
public function saveAuthAssignment($assignment)
{
$this->db->createCommand()
->update($this->assignmentTable, array(
'bizrule'=>$assignment->getBizRule(),
'data'=>serialize($assignment->getData()),
), 'itemname=:itemname AND userid=:userid', array(
'itemname'=>$assignment->getItemName(),
'userid'=>$assignment->getUserId()
));
}
/**
* Returns the authorization items of the specific type and user.
* @param integer $type the item type (0: operation, 1: task, 2: role). Defaults to null,
* meaning returning all items regardless of their type.
* @param mixed $userId the user ID. Defaults to null, meaning returning all items even if
* they are not assigned to a user.
* @return array the authorization items of the specific type.
*/
public function getAuthItems($type=null,$userId=null)
{
if($type===null && $userId===null)
{
$command=$this->db->createCommand()
->select()
->from($this->itemTable);
}
else if($userId===null)
{
$command=$this->db->createCommand()
->select()
->from($this->itemTable)
->where('type=:type', array(':type'=>$type));
}
else if($type===null)
{
$command=$this->db->createCommand()
->select('name,type,description,t1.bizrule,t1.data')
->from(array(
$this->itemTable.' t1',
$this->assignmentTable.' t2'
))
->where('name=itemname AND userid=:userid', array(':userid'=>$userId));
}
else
{
$command=$this->db->createCommand()
->select('name,type,description,t1.bizrule,t1.data')
->from(array(
$this->itemTable.' t1',
$this->assignmentTable.' t2'
))
->where('name=itemname AND type=:type AND userid=:userid', array(
':type'=>$type,
':userid'=>$userId
));
}
$items=array();
foreach($command->queryAll() as $row)
{
if(($data=@unserialize($row['data']))===false)
$data=null;
$items[$row['name']]=new CAuthItem($this,$row['name'],$row['type'],$row['description'],$row['bizrule'],$data);
}
return $items;
}
/**
* Creates an authorization item.
* An authorization item represents an action permission (e.g. creating a post).
* It has three types: operation, task and role.
* Authorization items form a hierarchy. Higher level items inheirt permissions representing
* by lower level items.
* @param string $name the item name. This must be a unique identifier.
* @param integer $type the item type (0: operation, 1: task, 2: role).
* @param string $description description of the item
* @param string $bizRule business rule associated with the item. This is a piece of
* PHP code that will be executed when {@link checkAccess} is called for the item.
* @param mixed $data additional data associated with the item.
* @return CAuthItem the authorization item
* @throws CException if an item with the same name already exists
*/
public function createAuthItem($name,$type,$description='',$bizRule=null,$data=null)
{
$this->db->createCommand()
->insert($this->itemTable, array(
'name'=>$name,
'type'=>$type,
'description'=>$description,
'bizrule'=>$bizRule,
'data'=>serialize($data)
));
return new CAuthItem($this,$name,$type,$description,$bizRule,$data);
}
/**
* Removes the specified authorization item.
* @param string $name the name of the item to be removed
* @return boolean whether the item exists in the storage and has been removed
*/
public function removeAuthItem($name)
{
if($this->usingSqlite())
{
$this->db->createCommand()
->delete($this->itemChildTable, 'parent=:name1 OR child=:name2', array(
':name1'=>$name,
':name2'=>$name
));
$this->db->createCommand()
->delete($this->assignmentTable, 'itemname=:name', array(
':name'=>$name,
));
}
return $this->db->createCommand()
->delete($this->itemTable, 'name=:name', array(
':name'=>$name
)) > 0;
}
/**
* Returns the authorization item with the specified name.
* @param string $name the name of the item
* @return CAuthItem the authorization item. Null if the item cannot be found.
*/
public function getAuthItem($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;
}
/**
* Saves an authorization item to persistent storage.
* @param CAuthItem $item the item to be saved.
* @param string $oldName the old item name. If null, it means the item name is not changed.
*/
public function saveAuthItem($item,$oldName=null)
{
if($this->usingSqlite() && $oldName!==null && $item->getName()!==$oldName)
{
$this->db->createCommand()
->update($this->itemChildTable, array(
'parent'=>$item->getName(),
), 'parent=:whereName', array(
':whereName'=>$oldName,
));
$this->db->createCommand()
->update($this->itemChildTable, array(
'child'=>$item->getName(),
), 'child=:whereName', array(
':whereName'=>$oldName,
));
$this->db->createCommand()
->update($this->assignmentTable, array(
'itemname'=>$item->getName(),
), 'itemname=:whereName', array(
':whereName'=>$oldName,
));
}
$this->db->createCommand()
->update($this->itemTable, array(
'name'=>$item->getName(),
'type'=>$item->getType(),
'description'=>$item->getDescription(),
'bizrule'=>$item->getBizRule(),
'data'=>serialize($item->getData()),
), 'name=:whereName', array(
':whereName'=>$oldName===null?$item->getName():$oldName,
));
}
/**
* Saves the authorization data to persistent storage.
*/
public function save()
{
}
/**
* Removes all authorization data.
*/
public function clearAll()
{
$this->clearAuthAssignments();
$this->db->createCommand()->delete($this->itemChildTable);
$this->db->createCommand()->delete($this->itemTable);
}
/**
* Removes all authorization assignments.
*/
public function clearAuthAssignments()
{
$this->db->createCommand()->delete($this->assignmentTable);
}
/**
* Checks whether there is a loop in the authorization item hierarchy.
* @param string $itemName parent item name
* @param string $childName the name of the child item that is to be added to the hierarchy
* @return boolean whether a loop exists
*/
protected function detectLoop($itemName,$childName)
{
if($childName===$itemName)
return true;
foreach($this->getItemChildren($childName) as $child)
{
if($this->detectLoop($itemName,$child->getName()))
return true;
}
return false;
}
/**
* @return CDbConnection the DB connection instance
* @throws CException if {@link connectionID} does not point to a valid application component.
*/
protected function getDbConnection()
{
if($this->db!==null)
return $this->db;
else if(($this->db=Yii::app()->getComponent($this->connectionID)) instanceof CDbConnection)
return $this->db;
else
throw new CException(Yii::t('yii','CDbAuthManager.connectionID "{id}" is invalid. Please make sure it refers to the ID of a CDbConnection application component.',
array('{id}'=>$this->connectionID)));
}
/**
* @return boolean whether the database is a SQLite database
*/
protected function usingSqlite()
{
return $this->_usingSqlite;
}
}
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