Add possibility of use a relative URL for "Your cookie policy"

Normally, you can enter a relative url in an url field (which contains an uri string) by prefixing it, e.g. internal:/node/1. However, this is not yet handled by the module. To fix this properly, we'd have to convert the uri to a proper Url object using Url::fromUri() and set this for the relevant variables. Twig can handle url objects nicely and automatically calls toString during render. The JS however needs the plain text url. Probably something along the lines of this:

use Drupal\Core\Url;
// in cookieconsent_page_attachments():
$url = !empty($config->get('cookie_policy')) ? Url::fromUri($config->get('cookie_policy')) : NULL;
$attachments['#attached']['drupalSettings']['cookieconsent']['link'] = $url ? $url->toString() : NULL;
// ...
$element['#link'] = $url;

As a workaround for now, you can change the #type of the cookie_policy to textfield, as that value is directly passed along to the template.

Hi,
you can override the module method with:

function THEMENAME_page_attachments_alter(array &$attachments) {

  $config = \Drupal::config('cookieconsent.settings');

  // Get the URL of Cookie Policy from node ID
  $options = ['absolute' => TRUE];
  $cookie_policy_url = \Drupal\Core\Url::fromRoute('entity.node.canonical', ['node' => NODE_ID], $options);
  $cookie_policy_url = $cookie_policy_url->toString();

  // Update Cookie Policy URL - CookieConsent module
  $attachments['#attached']['drupalSettings']['cookieconsent']['link'] = $cookie_policy_url;

  // Render the template and pass it over to our javascript.
  /** @var Drupal\Core\Render\Renderer $renderer */
  $renderer = \Drupal::service('renderer');
  $element = [
    '#theme' => 'cookieconsent',
    '#dismiss' => $config->get('accept_button_text'),
    '#message' => $config->get('headline_text'),
    '#target' => $config->get('target'),
    '#link' => $cookie_policy_url,
    '#learn_more' => $config->get('read_more_button_text'),
  ];
  /** @var Drupal\Core\Render\Markup $markup */
  $markup = $renderer->renderRoot($element);

  // Cast to string (Uses the magic __toString method).
  $attachments['#attached']['drupalSettings']['cookieconsent']['markup'] = (string) $markup;
}

This needs to be fixed in the module, not with a workaround.

Closing this because of the patch committed in #2910802: Update the policy link field type to a node entity autocomplete. I feel that functionality is more suited.