Magento 2 - Get Request Params / Api Request Params From Plugin

Question

I am trying to access request parameters made to the api url which I am setting a response for via a plugin.

The call is to: rest/default/V1/guest-carts/a9e6330920e85d09a123a396f77a9275/shipping-information

Here is the code that I am currently using, however it provides an empty array.

namespace Vendor\Onepage\Plugin;

class ShippingInformationManagementPlugin
{

protected $_request;


public function __construct(
    \Magento\Framework\App\RequestInterface $request
)
{
    $this->_request = $request;
}

public function beforeSaveAddressInformation(
    \Magento\Checkout\Model\ShippingInformationManagement $subject,
    $cartId,
    \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
)
{
    var_dump($this->_request->getParams());
    die('testing');
}

}

Answer 1

Looks like you are using wrong class in your construct for $request. Change your construct to following and it should work:

public function __construct(
    \Magento\Framework\Webapi\Rest\Request $request
) {
    $this->_request = $request;
}

After that you can get REST request's parameters in following way:

var_dump($this->_request->getParams());

Do clear necessary caches after the above change.

Answer 2

You have to change the line

var_dump($this->_request->getParams());

to

var_dump($subject->_request->getParams());