prefer_latest_content-1.0.x-dev/prefer_latest_content.module

<?php

/**
 * @file
 * Dot module for prefer_latest_revision, show latest revision for those with permission.
 */

use Drupal\Core\Url;
use Drupal\prefer_latest_content\Utils;

/**
 * @file
 * Primary module hooks for Prefer Latest Content module.
 *
 * @DCG
 * This file is no longer required in Drupal 8.
 * @see https://www.drupal.org/node/2217931
 */

/**
 * Implements hook_page_attachments().
 *
 * Provide aafc metatag elements in the head to each page.
 */
function prefer_latest_content_page_attachments(array &$page) {
  if (\Drupal::currentUser()->hasPermission('prefer latest content')) {
    $page['#attached']['library'][] = 'prefer_latest_content/prefer_latest_content';
  }
}

/**
 * Future possibly add body class.
 */
function prefer_latest_content_page(&$variables) {
}

/**
 * Implements hook_preprocess_html().
 */
function prefer_latest_content_preprocess_html(&$variables) {
  // entity.node.latest_version  // Redirect to this.
  // entity.node.canonical.
  $route_match = Utils::getRouteName();
  if (\Drupal::currentUser()->isAnonymous()) {
    $variables['#cache']['contexts'][] = 'user.roles:anonymous';
  }
  if (!$route_match == 'entity.node.latest_version') {
    if (!\Drupal::currentUser()->isAnonymous()) {
      $variables['#cache']['contexts'][] = 'user.roles:authenticated';
    }
    return;
  }
  if (!$route_match == 'entity.node.canonical') {
    $variables['#cache']['contexts'][] = 'user.roles:anonymous';
    // Bail out early.
    return;
  }
  if (!\Drupal::currentUser()->hasPermission('prefer latest content')) {
    if (\Drupal::currentUser()->isAnonymous()) {
      $variables['#cache']['contexts'][] = 'user.roles:anonymous';
    }
    // This functionality is only intended for roles with this permission.
    return;
  }
  $route_match = Utils::getRouteName();
  $current_user_roles = \Drupal::currentUser()->getRoles();

  // Check if user is an admin.
  if (in_array('administrator', $current_user_roles)) {
    // This functionality is not intended for the administrator role.
    return;
  }

  // Ensure the cache varies correctly.
  // Improve cache behavior.
  $variables['#cache']['contexts'][] = 'user.roles:authenticated';
  $variables['#cache']['max-age'] = 0;

  $lang = \Drupal::languageManager()->getCurrentLanguage()->getId();
  // Begin logic to grab moderation state.
  $node = \Drupal::routeMatch()->getParameter('node');
  $node_revision = \Drupal::routeMatch()->getParameter('node_revision');
  $routeMatchParams = \Drupal::routeMatch()->getParameters();
  $nid = 0;
  $vid = 0;
  $revision_is_object = FALSE;
  $nodeLoaded = 0;
  $archived = '';
  if ($node) {
    // Workaround for https://www.drupal.org/project/drupal/issues/2730631 .
    // Workaround for inconsistent router behaviour, see comments in issue 2730631.
    // @todo , follow up on issue 2730631.
    $node_storage = \Drupal::entityTypeManager()->getStorage('node');

    if (is_string($node) && is_numeric($node)) {
      $nid = $node;
    }
    elseif (gettype($node) == 'object') {
      $nid = $node->id();
      $vid = $node->getRevisionId();
      // Load a single node.
      $nodeLoaded = $node_storage->load($nid);
    }

    if (is_string($node_revision) && is_numeric($node_revision)) {
      $vid = $node_revision;
    }

    if (gettype($node_revision) == 'object') {
      $revision_is_object = TRUE;
      $vid = $node_revision->revision_id();
    }

    if ($vid == 0 && gettype($node_revision) == 'object') {
      // Get the revision id.
      $vid = $nodeLoaded->getRevisionId();
    }

    if ($vid) {
      if ($nodeLoaded->isPublished() && $latestRevision = Utils::getLatestRevisionOnlyIfDraft($nid, $vid)) {
        $language = \Drupal::languageManager()->getCurrentLanguage();
        $langcode = $language->getId();
        $url_options = [
          'absolute' => FALSE,
          'language' => \Drupal::languageManager()->getLanguage($langcode),
        ];
        $base_path = Url::fromRoute('<front>', [], $url_options)->toString();
        $lang_position = iconv_strrpos($base_path, '/' . $langcode);
        if ($lang_position > 0) {
          $base_path = substr($base_path, 0, $lang_position);
        }
        Utils::gotoLegacy($base_path . '/node/' . $nid . '/latest', ['language' => $language], '302');
      }
    }
  }
}