analytics-8.x-1.0-alpha5/analytics.module

<?php

use Drupal\Core\Cache\CacheableMetadata;

/**
 * Implements hook_page_bottom().
 */
function analytics_page_bottom(array &$page_bottom) {
  if (\Drupal::config('analytics.settings')->get('disable_page_build')) {
    return;
  }

  /** @var \Drupal\analytics\Entity\AnalyticsServiceInterface[] $services */
  $services = \Drupal::entityTypeManager()->getStorage('analytics_service')->loadMultiple();
  foreach ($services as $service) {
    if (!$service->status()) {
      // If the service is disabled, skip it.
      continue;
    }

    $plugin = $service->getService();
    if ($plugin->canTrack() && $output = $plugin->getOutput()) {
      $cacheability = CacheableMetadata::createFromObject($service);
      // @todo Add cache metadata from the result of the canTrack access checking.
      $cacheability->applyTo($output);
      $page_bottom['analytics_' . $service->id()] = $output;
    }
  }
}

/**
 * Implements hook_page_attachments().
 */
function analytics_page_attachments(array &$attachments) {
  if (\Drupal::config('analytics.settings')->get('privacy.dnt')) {
    $attachments['#attached']['library'][] = 'analytics/dnt';
  }
}