Create cookie after download file

Question

I want to create a cookie after a file download.

This is an extension on the existing module: https://www.drupal.org/project/file_utility

Each time you click on a download, a popup opens. For me it is fine to have the visitors e-mail address once. Then direct download is possible without showing the popup again on other download pages.

This part of code is not generating a cookie .. why?

EDIT: $c_response->send(); was missing here.

    $c_response = new \Symfony\Component\HttpFoundation\Response();
    $c_response->headers->setCookie(new \Symfony\Component\HttpFoundation\Cookie('foo', 'bar'));
    $c_response->send();

    // Get cookie value
    $c_request  = new \Symfony\Component\HttpFoundation\Request();
    $c_value = $c_request->cookies->get('foo');

    if($c_value) {
        \Drupal::logger('file_utility')->notice($c_value);
    } else {
        \Drupal::logger('file_utility')->notice("cookie foo is empty");
    }

This is the function where the download logic happens: In this function, first I need to check if the cookie exists. If so, direct download can start. If not, popup must be initiated. The first time, the cookie will be empty.

    public function downloadAction() {
        // Get cookie value
        $c_request = new \Symfony\Component\HttpFoundation\Request();
        $c_value = $c_request->cookies->get('foo');
        \Drupal::logger('file_utility')->notice("cookie: " . $c_value);
        if ($c_value) {
            \Drupal::logger('file_utility')->notice($c_value);
        } else {
            \Drupal::logger('file_utility')->notice("cookie foo is empty");
        }

        /** set cookie if $c_value is empty **/        
        $c_response = new \Symfony\Component\HttpFoundation\Response();
        $c_response->headers->setCookie(new \Symfony\Component\HttpFoundation\Cookie('foo2', 'bar2'));
        $c_response->send();
        /** end set cookie **/

        if (!isset($_GET['f_path'])) {
            return;
        }
        // Process download.
        $f_path_encoded = \Drupal::request()->query->get('f_path');
        $full_path = base64_decode(urldecode($f_path_encoded));
        $force_download = \Drupal::request()->query->get('force_download');
        $response['file_name'] = basename($full_path);
        $uid = \Drupal::currentUser()->id();
        $user = User::load($uid);
        if ($user->hasPermission('file download access') && $force_download == '1') {
            header('Content-Description: File Transfer');
            header('Content-Type: application/octet-stream');
            header('Content-Disposition: attachment; filename="' . basename($response['file_name']) . '"');
            header('Expires: 0');
            header('Content-Transfer-Encoding: binary');
            header('Cache-Control: must-revalidate');
            header('Pragma: public');
            // Flush system output buffer.
            flush();
        } elseif ($user->hasPermission('file download access') && $force_download == '0') {
            $response = new RedirectResponse($full_path);
            $response->send();
            die;
        } else {
            $url = $full_path;
            if (strpos($full_path, 'sites/default') !== FALSE) {
                throw new AccessDeniedHttpException();
            } else {
                $response = new RedirectResponse($url);
                $response->send();
                die;
            }
        }

    }

Extra: Can I set the cookie after the formsubmit? I found that you can add a response to a form_state but that is also not setting the cookie. I have added the first 3 lines in below function, but that is not working at the moment.

     /**
     * AJAX callback handler that displays any errors or a success message.
     */
    public function submitUserInfoFormAjax(array $form, FormStateInterface $form_state) {
        $c_response = new \Symfony\Component\HttpFoundation\Response();
        $c_response->headers->setCookie(new \Symfony\Component\HttpFoundation\Cookie('john', 'do'));
        $form_state->setResponse($c_response);

        $response = new AjaxResponse();
        $value = $form_state->getValues();
        //$name = $value['name'];
        $email = $value['email'];
        $user_ip = isset($_SERVER['SERVER_ADDR']) ? $_SERVER['SERVER_ADDR'] : \Drupal::request()->getHost();
        $f_path_encoded = \Drupal::request()->query->get('f_path');
        $f_path = base64_decode(urldecode($f_path_encoded));
        $force_download = \Drupal::request()->query->get('force_download');
        // If there are any form errors, re-display the form.
        if ($form_state->hasAnyErrors()) {
            $response->addCommand(new ReplaceCommand('#status_message_div', $form));
        } else {
            $status = parent::save($form, $form_state);

            $entity = $this->entity;
            $response->addCommand(new RedirectCommand('/filedownload?f_path=' . $f_path_encoded . '&force_download=' . $force_download));
            $response->addCommand(new CloseModalDialogCommand());
        }

        return $response;
    }

Important notice for making the cookie available for javascript:

httponly must be set to false in the constructor.

$response->headers->setCookie(new \Symfony\Component\HttpFoundation\Cookie('_john', 'do', time() + 3600, '/', '.yourdomain.com', false, false));

Answer 1

I think the problem in your current code is that you're overwriting the response. You should add the cookie to the default AjaxResponse instead:

public function submitUserInfoFormAjax(array $form, FormStateInterface $form_state) {
    $response = new AjaxResponse();

    $response->headers->setCookie(new \Symfony\Component\HttpFoundation\Cookie('john', 'do'));

    $value = $form_state->getValues();
    //$name = $value['name'];
    $email = $value['email'];
    $user_ip = isset($_SERVER['SERVER_ADDR']) ? $_SERVER['SERVER_ADDR'] : \Drupal::request()->getHost();
    $f_path_encoded = \Drupal::request()->query->get('f_path');
    $f_path = base64_decode(urldecode($f_path_encoded));
    $force_download = \Drupal::request()->query->get('force_download');
    // If there are any form errors, re-display the form.
    if ($form_state->hasAnyErrors()) {
        $response->addCommand(new ReplaceCommand('#status_message_div', $form));
    } else {
        $status = parent::save($form, $form_state);

        $entity = $this->entity;
        $response->addCommand(new RedirectCommand('/filedownload?f_path=' . $f_path_encoded . '&force_download=' . $force_download));
        $response->addCommand(new CloseModalDialogCommand());
    }

    return $response;
}