invisible_recaptcha.module

<?php

/**
 * @file
 * Contains hook implementations.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\invisible_recaptcha\InvisibleRecaptcha;

/**
 * Implements hook_form().
 */
function invisible_recaptcha_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $state = \Drupal::service('state');
  // Only attach recaptcha if it is enabled on the site.
  if (!empty($state->get('invisible_recaptcha.enabled'))) {
    $site_key = $state->get('invisible_recaptcha.site_key');
    // Gets the form ids form the invisible recaptcha configurations.
    $config = \Drupal::service('config.factory')
      ->getEditable('invisible_recaptcha.recaptcha_points');
    $forms_ids = $config->get('forms_ids');

    // Modifies the current form if it is in the configurations.
    if (in_array($form_id, $forms_ids)) {
      $form['#attached']['library'][] = 'invisible_recaptcha/invisible_recaptcha';
      $form['#validate'][] = '_contact_form_validation';

      // Adds a div for invisible recaptcha client side integration.
      $form['recaptcha-container'] = [
        '#type' => 'container',
        '#markup' => '',
        '#attributes' => [
          'class' => "g-recaptcha",
          'data-sitekey' => $site_key,
          'data-callback' => "recaptcha_callback",
          'data-size' => "invisible",
        ],

      ];
    }
  }
}

/**
 * Validates the recaptcha key.
 *
 * @param array $form
 *   The structure of the form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current state of the form.
 */
function _contact_form_validation(array &$form, FormStateInterface $form_state) {
  $state = \Drupal::service('state');
  $invisible_recaptcha = new InvisibleRecaptcha();
  $secret_key = $state->get('invisible_recaptcha.secret_key');
  if (!empty($secret_key)) {
    $recaptcha_validation = $invisible_recaptcha->validateInvisibleRecaptchaCode($secret_key);
  }

  // Sets an error if the recaptcha validation fails.
  if (empty($recaptcha_validation) || !$recaptcha_validation) {
    $form_state->setErrorByName("recaptcha", "Captcha validation failed.");
  }
}