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Cors, yii\filters\Cors | API Documentation for Yii 2.0

Class yii\filters\Cors

Cors filter implements Cross Origin Resource Sharing.

Make sure to read carefully what CORS does and does not. CORS do not secure your API, but allow the developer to grant access to third party code (ajax calls from external domain).

You may use CORS filter by attaching it as a behavior to a controller or module, like the following,

public function behaviors()
{
    return [
        'corsFilter' => [
            'class' => \yii\filters\Cors::class,
        ],
    ];
}

The CORS filter can be specialized to restrict parameters, like this, MDN CORS Information

public function behaviors()
{
    return [
        'corsFilter' => [
            'class' => \yii\filters\Cors::class,
            'cors' => [
                
                'Origin' => ['http://www.myserver.com', 'https://www.myserver.com'],
                
                'Access-Control-Request-Method' => ['POST', 'PUT'],
                
                'Access-Control-Request-Headers' => ['X-Wsse'],
                
                'Access-Control-Allow-Credentials' => true,
                
                'Access-Control-Max-Age' => 3600,
                
                'Access-Control-Expose-Headers' => ['X-Pagination-Current-Page'],
            ],

        ],
    ];
}

For more information on how to add the CORS filter to a controller, see the Guide on REST controllers.

Property Details

Hide inherited properties

Define specific CORS rules for specific actions

Basic headers handled for the CORS requests.

public array $cors = [ 'Origin' => [ '*', ], 'Access-Control-Request-Method' => [ 'GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS', ], 'Access-Control-Request-Headers' => [ '*', ], 'Access-Control-Allow-Credentials' => null, 'Access-Control-Max-Age' => 86400, 'Access-Control-Expose-Headers' => [], ]

The current request. If not set, the request application component will be used.

The response to be sent. If not set, the response application component will be used.

Method Details

Hide inherited methods

Defined in: yii\base\BaseObject::__call()

Calls the named method which is not a class method.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

                public function __call($name, $params)
{
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

Initializes the object with the given configuration $config.
Call init().

If this method is overridden in a child class, it is recommended that

the last parameter of the constructor is a configuration array, like $config here.
call the parent implementation at the end of the constructor.

public void __construct ( $config = [] ) $config array

Name-value pairs that will be used to initialize the object properties

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

Defined in: yii\base\BaseObject::__get()

Returns the value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $object->property;.

See also __set().

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter();
    } elseif (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}

public boolean __isset ( $name ) $name string

The property name or the event name

return boolean

Whether the named property is set (not null).

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    return false;
}

Defined in: yii\base\BaseObject::__set()

Sets value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $object->property = $value;.

See also __get().

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter($value);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    } else {
        throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
    }
}

Defined in: yii\base\BaseObject::__unset()

Sets an object property to null.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($object->property).

Note that if the property is not defined, this method will do nothing. If the property is read-only, it will throw an exception.

See also https://www.php.net/manual/en/function.unset.php.

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Unsetting read-only property: ' . get_class($this) . '::' . $name);
    }
}

public mixed afterAction ( $action, $result ) $action yii\base\Action

The action just executed.

$result mixed

The action execution result

return mixed

The processed action result.

                public function afterAction($action, $result)
{
    return $result;
}

                public function afterFilter($event)
{
    $event->result = $this->afterAction($event->action, $event->result);
    $this->owner->off(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter']);
}

Defined in: yii\base\ActionFilter::attach()

Attaches the behavior object to the component.

The default implementation will set the $owner property and attach event handlers as declared in events(). Make sure you call the parent implementation if you override this method.

                public function attach($owner)
{
    $this->owner = $owner;
    $owner->on(Controller::EVENT_BEFORE_ACTION, [$this, 'beforeFilter']);
}

This method is invoked right before an action is to be executed (after all possible filters.) You may override this method to do last-minute preparation for the action.

                public function beforeAction($action)
{
    $this->request = $this->request ?: Yii::$app->getRequest();
    $this->response = $this->response ?: Yii::$app->getResponse();
    $this->overrideDefaultSettings($action);
    $requestCorsHeaders = $this->extractHeaders();
    $responseCorsHeaders = $this->prepareHeaders($requestCorsHeaders);
    $this->addCorsHeaders($this->response, $responseCorsHeaders);
    if ($this->request->isOptions && $this->request->headers->has('Access-Control-Request-Method')) {
        
        $this->response->setStatusCode(200);
        return false;
    }
    return true;
}

                public function beforeFilter($event)
{
    if (!$this->isActive($event->action)) {
        return;
    }
    $event->isValid = $this->beforeAction($event->action);
    if ($event->isValid) {
        
        
        $this->owner->on(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter'], null, false);
    } else {
        $event->handled = true;
    }
}

Defined in: yii\base\BaseObject::canGetProperty()

Returns a value indicating whether a property can be read.

A property is readable if:

the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also canSetProperty().

                public function canGetProperty($name, $checkVars = true)
{
    return method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name);
}

Defined in: yii\base\BaseObject::canSetProperty()

Returns a value indicating whether a property can be set.

A property is writable if:

the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars = true ) $name string

The property name

$checkVars boolean

Whether to treat member variables as properties

return boolean

Whether the property can be written

                public function canSetProperty($name, $checkVars = true)
{
    return method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name);
}

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

                public static function className()
{
    return get_called_class();
}

Defined in: yii\base\ActionFilter::detach()

Detaches the behavior object from the component.

The default implementation will unset the $owner property and detach event handlers declared in events(). Make sure you call the parent implementation if you override this method.

                public function detach()
{
    if ($this->owner) {
        $this->owner->off(Controller::EVENT_BEFORE_ACTION, [$this, 'beforeFilter']);
        $this->owner->off(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter']);
        $this->owner = null;
    }
}

Defined in: yii\base\Behavior::events()

Declares event handlers for the $owner's events.

Child classes may override this method to declare what PHP callbacks should be attached to the events of the $owner component.

The callbacks will be attached to the $owner's events when the behavior is attached to the owner; and they will be detached from the events when the behavior is detached from the component.

The callbacks can be any of the following:

method in this behavior: 'handleClick', equivalent to [$this, 'handleClick']
object method: [$object, 'handleClick']
static method: ['Page', 'handleClick']
anonymous function: function ($event) { ... }

The following is an example:

[
    Model::EVENT_BEFORE_VALIDATE => 'myBeforeValidate',
    Model::EVENT_AFTER_VALIDATE => 'myAfterValidate',
]

public array events ( ) return array

Events (array keys) and the corresponding event handler methods (array values).

                public function events()
{
    return [];
}

                protected function getActionId($action)
{
    if ($this->owner instanceof Module) {
        $mid = $this->owner->getUniqueId();
        $id = $action->getUniqueId();
        if ($mid !== '' && strpos($id, $mid) === 0) {
            $id = substr($id, strlen($mid) + 1);
        }
    } else {
        $id = $action->id;
    }
    return $id;
}

Defined in: yii\base\BaseObject::hasMethod()

Returns a value indicating whether a method is defined.

The default implementation is a call to php function method_exists(). You may override this method when you implemented the php magic method __call().

                public function hasMethod($name)
{
    return method_exists($this, $name);
}

Defined in: yii\base\BaseObject::hasProperty()

Returns a value indicating whether a property is defined.

A property is defined if:

the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also:

public boolean hasProperty ( $name, $checkVars = true ) $name string

The property name

$checkVars boolean

Whether to treat member variables as properties

return boolean

Whether the property is defined

                public function hasProperty($name, $checkVars = true)
{
    return $this->canGetProperty($name, $checkVars) || $this->canSetProperty($name, false);
}

Defined in: yii\base\BaseObject::init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

                public function init()
{
}

                protected function isActive($action)
{
    $id = $this->getActionId($action);
    if (empty($this->only)) {
        $onlyMatch = true;
    } else {
        $onlyMatch = false;
        foreach ($this->only as $pattern) {
            if (StringHelper::matchWildcard($pattern, $id)) {
                $onlyMatch = true;
                break;
            }
        }
    }
    $exceptMatch = false;
    foreach ($this->except as $pattern) {
        if (StringHelper::matchWildcard($pattern, $id)) {
            $exceptMatch = true;
            break;
        }
    }
    return !$exceptMatch && $onlyMatch;
}

Override settings for specific action.

                public function overrideDefaultSettings($action)
{
    $actionId = $this->getActionId($action);
    if (isset($this->actions[$actionId])) {
        $actionParams = $this->actions[$actionId];
        $actionParamsKeys = array_keys($actionParams);
        foreach ($this->cors as $headerField => $headerValue) {
            if (in_array($headerField, $actionParamsKeys)) {
                $this->cors[$headerField] = $actionParams[$headerField];
            }
        }
    }
}

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