degov-8.x-2.0/modules/degov_social_media_settings/degov_social_media_settings.module

<?php

use Drupal\media\MediaInterface;
use Drupal\Component\Utility\Xss;
use Symfony\Component\Yaml\Yaml;
use Drupal\Component\Utility\NestedArray;

/**
 * Implements hook_theme().
 */
function degov_social_media_settings_theme($existing, $type, $theme, $path) {
  return [
    'degov_social_media_settings_block' => [
      'variables' => [
        'social_media_netiquette_url' => '',
        'social_media_privacy_url' => '',
        'social_media_sources' => NULL,
      ]
    ]
  ];
}

/**
 * Implements hook_locale_translation_projects_alter().
 */
function degov_social_media_settings_locale_translation_projects_alter(&$projects) {
  $projects['degov_social_media_settings'] = [
    'info' => [
      'interface translation project' => 'degov_social_media_settings',
      'interface translation server pattern' => drupal_get_path('module', 'degov_social_media_settings').'/translations/%language.po',
    ],
  ];
}

/**
 * Implements hook_modules_installed().
 */
function degov_social_media_settings_modules_installed($modules) {
  // Add field_social_media_type to some_embed and video media bundles
  // when they are installed after degov_social_media_settings module.
  $bundles = [];

  if (in_array('degov_media_social_media_embed', $modules)) {
    $bundles[] = 'some_embed';
  }

  if (in_array('degov_media_video', $modules)) {
    $bundles[] = 'video';
  }

  if (!empty($bundles)) {
    /** @var \Drupal\Core\Config\ConfigFactoryInterface $configFactory */
    $configFactory = \Drupal::service('config.factory');
    $path = drupal_get_path('module', 'degov_social_media_settings');
    $new = [];
    $add = [];

    foreach ($bundles as $bundle) {
      $new[] = 'field.field.media.' . $bundle . '.field_social_media_source';
      $add[] = 'core.entity_form_display.media.' . $bundle . '.default';
      $add[] = 'core.entity_form_display.media.' . $bundle . '.media_browser';
    }

    // Add field instance.
    foreach ($new as $file) {
      $data = Yaml::parse(file_get_contents(implode(DIRECTORY_SEPARATOR, [$path, 'config', 'optional', $file . '.yml'])));
      $configFactory->getEditable($file)->setData($data)->save();
    }

    // Rewrite form display to add field.
    foreach ($add as $file) {
      $config = $configFactory->getEditable($file);
      $active = $config->getRawData();

      if (!empty($active)) {
        $insert = Yaml::parse(file_get_contents(implode(DIRECTORY_SEPARATOR, [$path, 'config', 'rewrite', $file . '.yml'])));
        $merged = NestedArray::mergeDeep($active, $insert);
        $config->setData($merged)->save();
      }
    }
  }
}

/**
 * Implements hook_preprocess_paragraph__HOOK().
 */
function degov_social_media_settings_preprocess_paragraph__media_reference(&$variables) {
  /** @var \Drupal\paragraphs\ParagraphInterface $paragraph */
  $paragraph = $variables['paragraph'];
  /** @var \Drupal\media\MediaInterface $media */
  $media = $paragraph->field_media_reference_media->entity;

  // Add a class to the paragraph template for external media.
  if ($media instanceof MediaInterface && in_array($media->bundle(), ['some_embed', 'video'])) {
    $variables['attributes']['class'][] = 'social-media-source-' . $media->field_social_media_source->value;
  }
}

/**
 * Implements hook_preprocess_media().
 */
function degov_social_media_settings_preprocess_media(&$variables) {
  /** @var \Drupal\media\MediaInterface $media */
  $media = $variables['elements']['#media'];
  $entity_id = $media->id();
  $bundle = $media->bundle();

  // Do not display external media by default. This requires support in the
  // templates. They need to evaluate the $variables['social_media_disabled'].
  // Better solutions are possible, for instance:
  // - a twig filter or
  // - a field formatter or
  // - a preprocess function for the fields and a hook that informs this
  //   module about fields that need to be disabled
  if ($media instanceof MediaInterface && in_array($bundle, ['some_embed', 'video', 'tweet', 'instagram'])) {
    switch ($bundle) {
      case 'some_embed':
        // Maybe make sure this runs after degov_media_social_media_embed_preprocess_media__some_embed
        // and use $variables['code'] from there instead of generating it here?
        $field_value = $media->field_some_embed_code->value;
        if (function_exists('degov_media_social_media_embed_allowed_tags')) {
          $allowed_tags = degov_media_social_media_embed_allowed_tags();
          $markup = Xss::filter($field_value, $allowed_tags);
        }
        $source = $media->field_social_media_source->value;
        break;
      case 'video':
        $field_value = \Drupal::service('twig_field_value.twig.extension')->getFieldValue($variables['content']['field_media_video_embed_field']);
        $markup = \Drupal::service('renderer')->render($field_value);
        $source = $media->field_social_media_source->value;
        break;
      case 'tweet':
      case 'instagram':
        // Detach module libraries because they load js from twitter/instagram.
        unset($variables['content']['embed_code']['#attached']);
        $field_value = \Drupal::service('twig_field_value.twig.extension')
          ->getFieldValue($variables['content']['embed_code']);
        $markup = \Drupal::service('renderer')->render($field_value);
        $source = $bundle === 'tweet' ? 'twitter' : 'instagram';
        break;
    }

    if (!empty($markup)) {
      $variables['#attached']['drupalSettings']['degov_social_media_settings']['code'][$entity_id] = $markup;
      $variables['attributes']['class'][] = 'js-social-media-wrapper';
      $variables['attributes']['data-social-media-source'] = $source;
      $variables['attributes']['data-social-media-entity'] = $entity_id;
      $variables['social_media_disabled'] = TRUE;
    }
  }
}

/**
 * Returns an array of allowed social media sources.
 *
 * @return array
 *   An array of allowed values.
 */
function degov_social_media_settings_sources() {
  return \Drupal::config('degov_social_media_settings.default')->get('sources');
}