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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\filters;
use Closure;
use yii\base\Action;
use yii\base\Component;
use yii\base\Controller;
use yii\base\InvalidConfigException;
use yii\helpers\IpHelper;
use yii\helpers\StringHelper;
use yii\web\Request;
use yii\web\User;
/**
* This class represents an access rule defined by the [[AccessControl]] action filter.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class AccessRule extends Component
{
/**
* @var bool whether this is an 'allow' rule or 'deny' rule.
*/
public $allow;
/**
* @var array list of action IDs that this rule applies to. The comparison is case-sensitive.
* If not set or empty, it means this rule applies to all actions.
*/
public $actions;
/**
* @var array list of the controller IDs that this rule applies to.
*
* The comparison uses [[\yii\base\Controller::uniqueId]], so each controller ID is prefixed
* with the module ID (if any). For a `product` controller in the application, you would specify
* this property like `['product']` and if that controller is located in a `shop` module, this
* would be `['shop/product']`.
*
* The comparison is case-sensitive.
*
* If not set or empty, it means this rule applies to all controllers.
*
* Since version 2.0.12 controller IDs can be specified as wildcards, e.g. `module/*`.
*/
public $controllers;
/**
* @var array list of roles that this rule applies to (requires properly configured User component).
* Two special roles are recognized, and they are checked via [[User::isGuest]]:
*
* - `?`: matches a guest user (not authenticated yet)
* - `@`: matches an authenticated user
*
* If you are using RBAC (Role-Based Access Control), you may also specify role names.
* In this case, [[User::can()]] will be called to check access.
*
* Note that it is preferred to check for permissions instead.
*
* If this property is not set or empty, it means this rule applies regardless of roles.
* @see $permissions
* @see $roleParams
*/
public $roles;
/**
* @var array list of RBAC (Role-Based Access Control) permissions that this rules applies to.
* [[User::can()]] will be called to check access.
*
* If this property is not set or empty, it means this rule applies regardless of permissions.
* @since 2.0.12
* @see $roles
* @see $roleParams
*/
public $permissions;
/**
* @var array|Closure parameters to pass to the [[User::can()]] function for evaluating
* user permissions in [[$roles]].
*
* If this is an array, it will be passed directly to [[User::can()]]. For example for passing an
* ID from the current request, you may use the following:
*
* ```php
* ['postId' => Yii::$app->request->get('id')]
* ```
*
* You may also specify a closure that returns an array. This can be used to
* evaluate the array values only if they are needed, for example when a model needs to be
* loaded like in the following code:
*
* ```php
* 'rules' => [
* [
* 'allow' => true,
* 'actions' => ['update'],
* 'roles' => ['updatePost'],
* 'roleParams' => function($rule) {
* return ['post' => Post::findOne(Yii::$app->request->get('id'))];
* },
* ],
* ],
* ```
*
* A reference to the [[AccessRule]] instance will be passed to the closure as the first parameter.
*
* @see $roles
* @since 2.0.12
*/
public $roleParams = [];
/**
* @var array list of user IP addresses that this rule applies to. An IP address
* can contain the wildcard `*` at the end so that it matches IP addresses with the same prefix.
* For example, '192.168.*' matches all IP addresses in the segment '192.168.'.
* If not set or empty, it means this rule applies to all IP addresses.
* @see Request::userIP
*/
public $ips;
/**
* @var array list of request methods (e.g. `GET`, `POST`) that this rule applies to.
* If not set or empty, it means this rule applies to all request methods.
* @see \yii\web\Request::method
*/
public $verbs;
/**
* @var callable a callback that will be called to determine if the rule should be applied.
* The signature of the callback should be as follows:
*
* ```php
* function ($rule, $action)
* ```
*
* where `$rule` is this rule, and `$action` is the current [[Action|action]] object.
* The callback should return a boolean value indicating whether this rule should be applied.
*/
public $matchCallback;
/**
* @var callable a callback that will be called if this rule determines the access to
* the current action should be denied. This is the case when this rule matches
* and [[$allow]] is set to `false`.
*
* If not set, the behavior will be determined by [[AccessControl]],
* either using [[AccessControl::denyAccess()]]
* or [[AccessControl::$denyCallback]], if configured.
*
* The signature of the callback should be as follows:
*
* ```php
* function ($rule, $action)
* ```
*
* where `$rule` is this rule, and `$action` is the current [[Action|action]] object.
* @see AccessControl::$denyCallback
*/
public $denyCallback;
/**
* Checks whether the Web user is allowed to perform the specified action.
* @param Action $action the action to be performed
* @param User|false $user the user object or `false` in case of detached User component
* @param Request $request
* @return bool|null `true` if the user is allowed, `false` if the user is denied, `null` if the rule does not apply to the user
*/
public function allows($action, $user, $request)
{
if ($this->matchAction($action)
&& $this->matchRole($user)
&& $this->matchIP($request->getUserIP())
&& $this->matchVerb($request->getMethod())
&& $this->matchController($action->controller)
&& $this->matchCustom($action)
) {
return $this->allow ? true : false;
}
return null;
}
/**
* @param Action $action the action
* @return bool whether the rule applies to the action
*/
protected function matchAction($action)
{
return empty($this->actions) || in_array($action->id, $this->actions, true);
}
/**
* @param Controller $controller the controller
* @return bool whether the rule applies to the controller
*/
protected function matchController($controller)
{
if (empty($this->controllers)) {
return true;
}
$id = $controller->getUniqueId();
foreach ($this->controllers as $pattern) {
if (StringHelper::matchWildcard($pattern, $id)) {
return true;
}
}
return false;
}
/**
* @param User $user the user object
* @return bool whether the rule applies to the role
* @throws InvalidConfigException if User component is detached
*/
protected function matchRole($user)
{
$items = empty($this->roles) ? [] : $this->roles;
if (!empty($this->permissions)) {
$items = array_merge($items, $this->permissions);
}
if (empty($items)) {
return true;
}
if ($user === false) {
throw new InvalidConfigException('The user application component must be available to specify roles in AccessRule.');
}
foreach ($items as $item) {
if ($item === '?') {
if ($user->getIsGuest()) {
return true;
}
} elseif ($item === '@') {
if (!$user->getIsGuest()) {
return true;
}
} else {
if (!isset($roleParams)) {
$roleParams = !is_array($this->roleParams) && is_callable($this->roleParams) ? call_user_func($this->roleParams, $this) : $this->roleParams;
}
if ($user->can($item, $roleParams)) {
return true;
}
}
}
return false;
}
/**
* @param string|null $ip the IP address
* @return bool whether the rule applies to the IP address
*/
protected function matchIP($ip)
{
if (empty($this->ips)) {
return true;
}
foreach ($this->ips as $rule) {
if ($rule === '*' ||
$rule === $ip ||
(
$ip !== null &&
($pos = strpos($rule, '*')) !== false &&
strncmp($ip, $rule, $pos) === 0
) ||
(
($pos = strpos($rule, '/')) !== false &&
IpHelper::inRange($ip, $rule) === true
)
) {
return true;
}
}
return false;
}
/**
* @param string $verb the request method.
* @return bool whether the rule applies to the request
*/
protected function matchVerb($verb)
{
return empty($this->verbs) || in_array(strtoupper($verb), array_map('strtoupper', $this->verbs), true);
}
/**
* @param Action $action the action to be performed
* @return bool whether the rule should be applied
*/
protected function matchCustom($action)
{
return empty($this->matchCallback) || call_user_func($this->matchCallback, $this, $action);
}
}
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