BackendDecorator.php

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<?php
namespace Magento\Mtf\Util\Protocol\CurlTransport;

use Magento\Mtf\Config\DataInterface;
use Magento\Mtf\Util\Protocol\CurlInterface;
use Magento\Mtf\Util\Protocol\CurlTransport;

class BackendDecorator implements CurlInterface
{
    protected $transport;

    protected $formKey = null;

    protected $response;

    protected $configuration;

    public function __construct(CurlTransport $transport, DataInterface $configuration)
    {
        $this->transport = $transport;
        $this->configuration = $configuration;
        $this->authorize();
    }

    protected function authorize()
    {
        // Perform GET to backend url so form_key is set
        $url = $_ENV['app_backend_url'];
        $this->transport->write($url, [], CurlInterface::GET);
        $this->read();

        $url = $_ENV['app_backend_url'] . $this->configuration->get('application/0/backendLoginUrl/0/value');
        $data = [
            'login[username]' => $this->configuration->get('application/0/backendLogin/0/value'),
            'login[password]' => $this->configuration->get('application/0/backendPassword/0/value'),
            'form_key' => $this->formKey,
        ];
        $this->transport->write($url, $data, CurlInterface::POST);
        $response = $this->read();
        if (strpos($response, 'login-form') !== false) {
            throw new \Exception(
                'Admin user cannot be logged in by curl handler!'
            );
        }
    }

    protected function initFormKey()
    {
        preg_match('!var FORM_KEY = \'(\w+)\';!', $this->response, $matches);
        if (!empty($matches[1])) {
            $this->formKey = $matches[1];
        }
    }

    public function write($url, $params = [], $method = CurlInterface::POST, $headers = [])
    {
        if ($this->formKey) {
            $params['form_key'] = $this->formKey;
        } else {
            throw new \Exception(sprintf('Form key is absent! Url: "%s" Response: "%s"', $url, $this->response));
        }
        $this->transport->write($url, http_build_query($params), $method, $headers);
    }

    public function read()
    {
        $this->response = $this->transport->read();
        $this->initFormKey();
        return $this->response;
    }

    public function addOption($option, $value)
    {
        $this->transport->addOption($option, $value);
    }

    public function close()
    {
        $this->transport->close();
    }
}