content_translation.module 40.7 KB
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<?php

/**
 * @file
 * Allows entities to be translated into different languages.
 */

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use Drupal\content_translation\Plugin\Derivative\ContentTranslationLocalTasks;
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use Drupal\Core\Entity\ContentEntityInterface;
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use Drupal\Core\Entity\EntityFormControllerInterface;
use Drupal\Core\Entity\EntityInterface;
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use Drupal\Core\Language\Language;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\TypedData\TranslatableInterface;
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/**
 * Implements hook_help().
 */
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function content_translation_help($path, $arg) {
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  switch ($path) {
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    case 'admin/help#content_translation':
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      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
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      $output .= '<p>' . t('The Content Translation module allows you to create and manage translations for your Drupal site content. You can specify which elements need to be translated at the content-type level for content items and comments, at the vocabulary level for taxonomy terms, and at the site level for user accounts. Other modules may provide additional elements that can be translated. For more information, see the online handbook entry for <a href="!url">Content Translation</a>.', array('!url' => 'http://drupal.org/documentation/modules/translation_entity')) . '</p>';
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      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Enabling translation') . '</dt>';
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      $output .= '<dd><p>' . t('Before you can translate content, there must be at least two languages added on the <a href="!url">languages administration</a> page.', array('!url' => url('admin/config/regional/language'))) . '</p>';
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      $output .= '<p>' . t('After adding languages, <a href="!url">configure translation</a>.', array('!url' => url('admin/config/regional/content-language'))) . '</p>';
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      $output .= '<dt>' . t('Translating content') . '</dt>';
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      $output .= '<dd>' . t('After enabling translation you can create a new piece of content, or edit existing content and assign it a language. Then, you will see a <em>Translate</em> tab or link that will gives an overview of the translation status for the current content. From there, you can add translations and edit or delete existing translations. This process is similar for every translatable element on your site, such as taxonomy terms, comments or user accounts.') . '</dd>';
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      $output .= '<dt>' . t('Changing source language') . '</dt>';
      $output .= '<dd>' . t('When there are two or more possible source languages, selecting a <em>Source language</em> will repopulate the form using the specified source\'s values. For example, French is much closer to Spanish than to Chinese, so changing the French translation\'s source language to Spanish can assist translators.') . '</dd>';
      $output .= '<dt>' . t('Maintaining translations') . '</dt>';
      $output .= '<dd>' . t('If editing content in one language requires that translated versions also be updated to reflect the change, use the <em>Flag other translations as outdated</em> check box to mark the translations as outdated and in need of revision.') . '</dd>';
      $output .= '<dt>' . t('Translation permissions') . '</dt>';
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      $output .= '<dd>' . t('The Content Translation module makes a basic set of permissions available. Additional <a href="@permissions">permissions</a> are made available after translation is enabled for each translatable element.', array('@permissions' => url('admin/people/permissions', array('fragment' => 'module-content_translation')))) . '</dd>';
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      $output .= '</dl>';
      return $output;
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    case 'admin/config/regional/content-language':
      $output = '';
      if (!language_multilingual()) {
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        $output .= '<br/>' . t('Before you can translate content, there must be at least two languages added on the <a href="!url">languages administration</a> page.', array('!url' => url('admin/config/regional/language')));
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      }
      return $output;
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  }
}

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/**
 * Implements hook_module_implements_alter().
 */
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function content_translation_module_implements_alter(&$implementations, $hook) {
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  switch ($hook) {
    // Move some of our hook implementations to the end of the list.
    case 'menu_alter':
    case 'entity_info_alter':
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      $group = $implementations['content_translation'];
      unset($implementations['content_translation']);
      $implementations['content_translation'] = $group;
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      break;
  }
}

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/**
 * Implements hook_language_type_info_alter().
 */
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function content_translation_language_types_info_alter(array &$language_types) {
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  // Make content language negotiation configurable by removing the 'locked'
  // flag.
  $language_types[Language::TYPE_CONTENT]['locked'] = FALSE;
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  unset($language_types[Language::TYPE_CONTENT]['fixed']);
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}

/**
 * Implements hook_entity_info_alter().
 */
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function content_translation_entity_info_alter(array &$entity_info) {
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  // Provide defaults for translation info.
  foreach ($entity_info as $entity_type => &$info) {
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    if (!empty($info['translatable'])) {
      // Every fieldable entity type must have a translation controller class,
      // no matter if it is enabled for translation or not. As a matter of fact
      // we might need it to correctly switch field translatability when a field
      // is shared accross different entities.
      $info['controllers'] += array('translation' => 'Drupal\content_translation\ContentTranslationController');

      if (!isset($info['translation']['content_translation'])) {
        $info['translation']['content_translation'] = array();
      }
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      if (!empty($info['links']['canonical'])) {
        // Provide default links for the translation paths.
        $info['links'] += array(
          'drupal:content-translation-overview' => $info['links']['canonical'] . '/translations',
        );
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        $parts = explode('/', trim($info['links']['canonical'], '/'));
        $entity_position = array_search("{{$entity_type}}", $parts);
        if ($entity_position !== FALSE) {
          $info['translation']['content_translation'] += array(
            'access_callback' => 'content_translation_translate_access',
            'access_arguments' => array($entity_position),
          );
        }
      }
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    }
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  }
}
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/**
 * Implements hook_entity_bundle_info_alter().
 */
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function content_translation_entity_bundle_info_alter(&$bundles) {
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  foreach ($bundles as $entity_type => &$info) {
    foreach ($info as $bundle => &$bundle_info) {
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      $enabled = content_translation_get_config($entity_type, $bundle, 'enabled');
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      $bundle_info['translatable'] = !empty($enabled);
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    }
  }
}

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/**
 * Implements hook_entity_field_info_alter().
 */
function content_translation_entity_field_info_alter(&$info, $entity_type) {
  $translation_settings = config('content_translation.settings')->get($entity_type);

  if ($translation_settings) {
    // Currently field translatability is defined per-field but we may want to
    // make it per-instance instead, so leaving the possibility open for further
    // easier refactoring.
    $fields = array();
    foreach ($translation_settings as $bundle => $settings) {
      $fields += !empty($settings['content_translation']['fields']) ? $settings['content_translation']['fields'] : array();
    }

    $keys = array('definitions', 'optional');
    foreach ($fields as $name => $translatable) {
      foreach ($keys as $key) {
        if (isset($info[$key][$name])) {
          $info[$key][$name]['translatable'] = (bool) $translatable;
          break;
        }
      }
    }
  }
}

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/**
 * Implements hook_menu().
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 *
 * @todo Split this into route definition and menu link definition. See
 *   https://drupal.org/node/1987882 and https://drupal.org/node/2047633.
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 */
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function content_translation_menu() {
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  $items = array();

  // Create tabs for all possible entity types.
  foreach (entity_get_info() as $entity_type => $info) {
    // Provide the translation UI only for enabled types.
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    if (content_translation_enabled($entity_type)) {
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      $path = _content_translation_link_to_router_path($entity_type, $info['links']['canonical']);
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      $entity_position = count(explode('/', $path)) - 1;
      $keys = array_flip(array('theme_callback', 'theme_arguments', 'access_callback', 'access_arguments', 'load_arguments'));
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      $menu_info = array_intersect_key($info['translation']['content_translation'], $keys) + array('file' => 'content_translation.pages.inc');
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      $item = array();

      // Plugin annotations cannot contain spaces, thus we need to restore them
      // from underscores.
      foreach ($menu_info as $key => $value) {
        $item[str_replace('_', ' ', $key)] = $value;
      }

      $items["$path/translations"] = array(
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        'title' => 'Translate',
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        'route_name' => "content_translation.translation_overview_$entity_type",
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        'type' => MENU_LOCAL_TASK,
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        'context' => MENU_CONTEXT_PAGE,
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        'weight' => 2,
      ) + $item;

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      $items["$path/translations/overview"] = array(
        'title' => 'Overview',
        'type' => MENU_DEFAULT_LOCAL_TASK,
        'weight' => 0,
      );

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      // Add translation callback.
      // @todo Add the access callback instead of replacing it as soon as the
      // routing system supports multiple callbacks.
      $language_position = $entity_position + 3;
      $args = array($entity_position, $language_position, $language_position + 1);
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      $items["$path/translations/add/%language/%language"] = array(
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        'title' => 'Add',
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        'route_name' => "content_translation.translation_add_$entity_type",
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        'weight' => 1,
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      );
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      // Edit translation callback.
      $args = array($entity_position, $language_position);
      $items["$path/translations/edit/%language"] = array(
        'title' => 'Edit',
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        'route_name' => "content_translation.translation_edit_$entity_type",
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        'weight' => 1,
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      );
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      // Delete translation callback.
      $items["$path/translations/delete/%language"] = array(
        'title' => 'Delete',
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        'route_name' => "content_translation.delete_$entity_type",
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      ) + $item;
    }
  }

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  $items['admin/config/regional/content_translation/translatable/%/%'] = array(
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    'title' => 'Confirm change in translatability.',
    'description' => 'Confirm page for changing field translatability.',
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    'route_name' => 'content_translation.translatable',
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  );

  return $items;
}

/**
 * Implements hook_menu_alter().
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 *
 * @todo Split this into route definition and menu link definition. See
 *   https://drupal.org/node/1987882 and https://drupal.org/node/2047633.
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 */
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function content_translation_menu_alter(array &$items) {
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  // Clarify where translation settings are located.
  $items['admin/config/regional/content-language']['title'] = 'Content language and translation';
  $items['admin/config/regional/content-language']['description'] = 'Configure language and translation support for content.';

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  // Check that the declared menu base paths are actually valid.
  foreach (entity_get_info() as $entity_type => $info) {
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    if (content_translation_enabled($entity_type)) {
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      $path = _content_translation_link_to_router_path($entity_type, $info['links']['canonical']);
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      // If the base path is not defined we cannot provide the translation UI
      // for this entity type. In some cases the actual base path might not have
      // a menu loader associated, hence we need to check also for the plain "%"
      // variant. See for instance comment_menu().
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      if (!isset($items[$path]) && !isset($items["$path/edit"])
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          && !isset($items[_content_translation_menu_strip_loaders($path)])) {
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        unset(
          $items["$path/translations"],
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          $items["$path/translations/add/%language/%language"],
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          $items["$path/translations/delete/%language"]
        );
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        $t_args = array('@entity_type' => isset($info['label']) ? $info['label'] : $entity_type);
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        watchdog('content translation', 'The entities of type @entity_type do not define a valid base path: it will not be possible to translate them.', $t_args, WATCHDOG_WARNING);
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      }
      else {
        $entity_position = count(explode('/', $path)) - 1;
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        $edit_path = $path . '/edit';
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        if (isset($items[$edit_path])) {
          // If the edit path is a default local task we need to find the parent
          // item.
          $edit_path_split = explode('/', $edit_path);
          do {
            $entity_form_item = &$items[implode('/', $edit_path_split)];
            array_pop($edit_path_split);
          }
          while (!empty($entity_form_item['type']) && $entity_form_item['type'] == MENU_DEFAULT_LOCAL_TASK);

          // Make the "Translate" tab follow the "Edit" one when possibile.
          if (isset($entity_form_item['weight'])) {
            $items["$path/translations"]['weight'] = $entity_form_item['weight'] + 0.01;
          }
        }
      }
    }
  }
}

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/**
 * Implements hook_local_tasks_alter().
 */
function content_translation_local_tasks_alter(&$local_tasks) {
  // Alters in tab_root_id onto the content translation local task.
  $derivative = ContentTranslationLocalTasks::create(\Drupal::getContainer(), 'content_translation.local_tasks');
  $derivative->alterLocalTasks($local_tasks);
}

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/**
 * Convert an entity canonical link to a router path.
 *
 * @param string $link
 *   The entity link to be converted.
 *
 * @return string
 *   The resulting router path. For instance "/node/{node}" is turned into
 *   "node/%node".
 *
 * @todo Remove this and use the actual link values when all the Content
 *   Translation code is adapted to the new routing system.
 */
function _content_translation_link_to_router_path($entity_type, $link) {
  $path = preg_replace('|{([^}]+)}|', '%$1', trim($link, '/'));
  return str_replace('%id', '%' . $entity_type, $path);
}

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/**
 * Strips out menu loaders from the given path.
 *
 * @param string $path
 *   The path to process.
 *
 * @return
 *   The given path where all the menu loaders are replaced with "%".
 */
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function _content_translation_menu_strip_loaders($path) {
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  return preg_replace('|%[^/]+|', '%', $path);
}

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/**
 * Access callback for the translation overview page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity whose translation overview should be displayed.
 */
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function content_translation_translate_access(EntityInterface $entity) {
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  return $entity instanceof ContentEntityInterface && empty($entity->getUntranslated()->language()->locked) && language_multilingual() && $entity->isTranslatable() &&
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    (user_access('create content translations') || user_access('update content translations') || user_access('delete content translations'));
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}

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/**
 * Checks whether the given user can view the specified translation.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity whose translation overview should be displayed.
 * @param $langcode
 *   The language code of the translation to be displayed.
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 * @param \Drupal\Core\Session\AccountInterface $account
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 *   (optional) The account for which view access should be checked. Defaults to
 *   the current user.
 */
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function content_translation_view_access(EntityInterface $entity, $langcode, AccountInterface $account = NULL) {
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  $entity_type = $entity->entityType();
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  $info = $entity->entityInfo();
  $permission = "translate $entity_type";
  if (!empty($info['permission_granularity']) && $info['permission_granularity'] == 'bundle') {
    $permission = "translate {$entity->bundle()} $entity_type";
  }
  return !empty($entity->translation[$langcode]['status']) || user_access('translate any entity', $account) || user_access($permission, $account);
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}

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/**
 * Access callback for the translation addition page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity being translated.
 * @param \Drupal\Core\Language\Language $source
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 *   (optional) The language of the values being translated. Defaults to the
 *   entity language.
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 * @param \Drupal\Core\Language\Language $target
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 *   (optional) The language of the translated values. Defaults to the current
 *   content language.
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 */
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function content_translation_add_access(EntityInterface $entity, Language $source = NULL, Language $target = NULL) {
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  $source = !empty($source) ? $source : $entity->language();
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  $target = !empty($target) ? $target : language(Language::TYPE_CONTENT);
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  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
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  return $source->id != $target->id && isset($languages[$source->id]) && isset($languages[$target->id]) && !isset($translations[$target->id]) && content_translation_access($entity, 'create');
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}

/**
 * Access callback for the translation edit page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity being translated.
 * @param \Drupal\Core\Language\Language $language
 *   (optional) The language of the translated values. Defaults to the current
 *   content language.
 */
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function content_translation_edit_access(EntityInterface $entity, Language $language = NULL) {
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  $language = !empty($language) ? $language : language(Language::TYPE_CONTENT);
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  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
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  return isset($languages[$language->id]) && $language->id != $entity->getUntranslated()->language()->id && isset($translations[$language->id]) && content_translation_access($entity, 'update');
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}

/**
 * Access callback for the translation delete page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity being translated.
 * @param \Drupal\Core\Language\Language $language
 *   (optional) The language of the translated values. Defaults to the current
 *   content language.
 */
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function content_translation_delete_access(EntityInterface $entity, Language $language = NULL) {
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  $language = !empty($language) ? $language : language(Language::TYPE_CONTENT);
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  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
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  return isset($languages[$language->id]) && $language->id != $entity->getUntranslated()->language()->id && isset($translations[$language->id]) && content_translation_access($entity, 'delete');
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}

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/**
 * Implements hook_library_info().
 */
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function content_translation_library_info() {
  $path = drupal_get_path('module', 'content_translation');
  $libraries['drupal.content_translation.admin'] = array(
    'title' => 'Content translation UI',
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    'version' => \Drupal::VERSION,
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    'js' => array(
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      $path . '/content_translation.admin.js' => array(),
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    ),
    'css' => array(
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      $path . '/css/content_translation.admin.css' => array(),
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    ),
    'dependencies' => array(
      array('system', 'jquery'),
      array('system', 'drupal'),
      array('system', 'jquery.once'),
    ),
  );

  return $libraries;
}

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/**
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 * Returns the key name used to store the configuration setting.
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 *
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 * Based on the entity type and bundle, the keys used to store configuration
 * will have a common root name.
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 *
 * @param string $entity_type
 *   The type of the entity the setting refers to.
 * @param string $bundle
 *   The bundle of the entity the setting refers to.
 * @param string $setting
 *   The name of the setting.
 *
 * @return string
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 *   The key name of the configuration setting.
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 *
 * @todo Generalize this logic so that it is available to any module needing
 *   per-bundle configuration.
 */
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function content_translation_get_config_key($entity_type, $bundle, $setting) {
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  $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $entity_type);
  $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $bundle);
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  return $entity_type . '.' . $bundle . '.content_translation.' . $setting;
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}

/**
 * Retrieves the value for the specified setting.
 *
 * @param string $entity_type
 *   The type of the entity the setting refer to.
 * @param string $bundle
 *   The bundle of the entity the setting refer to.
 * @param string $setting
 *   The name of the setting.
 *
 * @returns mixed
 *   The stored value for the given setting.
 */
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function content_translation_get_config($entity_type, $bundle, $setting) {
  $key = content_translation_get_config_key($entity_type, $bundle, $setting);
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  return \Drupal::config('content_translation.settings')->get($key);
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}

/**
 * Stores the given value for the specified setting.
 *
 * @param string $entity_type
 *   The type of the entity the setting refer to.
 * @param string $bundle
 *   The bundle of the entity the setting refer to.
 * @param string $setting
 *   The name of the setting.
 * @param $value
 *   The value to be stored for the given setting.
 */
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function content_translation_set_config($entity_type, $bundle, $setting, $value) {
  $key = content_translation_get_config_key($entity_type, $bundle, $setting);
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  return \Drupal::config('content_translation.settings')->set($key, $value)->save();
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}

/**
 * Determines whether the given entity type is translatable.
 *
 * @param string $entity_type
 *   The type of the entity.
 * @param string $bundle
 *   (optional) The bundle of the entity. If no bundle is provided, all the
 *   available bundles are checked.
 *
 * @returns
 *   TRUE if the specified bundle is translatable. If no bundle is provided
 *   returns TRUE if at least one of the entity bundles is translatable.
 */
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function content_translation_enabled($entity_type, $bundle = NULL) {
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  $enabled = FALSE;

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  if (content_translation_supported($entity_type)) {
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    $bundles = !empty($bundle) ? array($bundle) : array_keys(entity_get_bundles($entity_type));
    foreach ($bundles as $bundle) {
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      if (content_translation_get_config($entity_type, $bundle, 'enabled')) {
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        $enabled = TRUE;
        break;
      }
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    }
  }

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  return $enabled;
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}

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/**
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 * Checks whether an entity type supports translation.
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 *
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 * @param string $entity_type
 *   The entity type.
 *
 * @return bool
 *   TRUE if an entity type is supported, FALSE otherwise.
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 */
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function content_translation_supported($entity_type) {
  $info = entity_get_info($entity_type);
  return !empty($info['translatable']) && !empty($info['links']['drupal:content-translation-overview']);
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}

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/**
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 * Content translation controller factory.
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 *
 * @param string $entity_type
 *   The type of the entity being translated.
 *
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 * @return \Drupal\content_translation\ContentTranslationControllerInterface
 *   An instance of the content translation controller interface.
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 */
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function content_translation_controller($entity_type) {
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  $entity_info = entity_get_info($entity_type);
  // @todo Throw an exception if the key is missing.
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  return new $entity_info['controllers']['translation']($entity_type, $entity_info);
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}

/**
 * Returns the entity form controller for the given form.
 *
 * @param array $form_state
 *   The form state array holding the entity form controller.
 *
 * @return \Drupal\Core\Entity\EntityFormControllerInterface;
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 *   An instance of the content translation form interface or FALSE if not an
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 *   entity form.
 */
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function content_translation_form_controller(array $form_state) {
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  return isset($form_state['controller']) && $form_state['controller'] instanceof EntityFormControllerInterface ? $form_state['controller'] : FALSE;
}

/**
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 * Checks whether a content translation is accessible.
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 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity to be accessed.
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 * @param $op
 *   The operation to be performed on the translation. Possible values are:
 *   - "view"
 *   - "update"
 *   - "delete"
 *   - "create"
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 *
 * @return
 *   TRUE if the current user is allowed to view the translation.
 */
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function content_translation_access(EntityInterface $entity, $op) {
  return content_translation_controller($entity->entityType())->getTranslationAccess($entity, $op) ;
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}

/**
 * Implements hook_permission().
 */
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function content_translation_permission() {
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  $permission = array(
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    'administer content translation' => array(
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      'title' => t('Administer translation settings'),
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      'description' => t('Configure translatability of entities and fields.'),
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    ),
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    'create content translations' => array(
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      'title' => t('Create translations'),
    ),
590
    'update content translations' => array(
591 592
      'title' => t('Edit translations'),
    ),
593
    'delete content translations' => array(
594 595
      'title' => t('Delete translations'),
    ),
596 597 598 599 600
    'translate any entity' => array(
      'title' => t('Translate any entity'),
    ),
  );

601 602
  // Create a translate permission for each enabled entity type and (optionally)
  // bundle.
603
  foreach (entity_get_info() as $entity_type => $info) {
604 605 606 607 608 609
    if (!empty($info['permission_granularity'])) {
      $t_args = array('@entity_label' => drupal_strtolower(t($info['label'])));

      switch ($info['permission_granularity']) {
        case 'bundle':
          foreach (entity_get_bundles($entity_type) as $bundle => $bundle_info) {
610
            if (content_translation_enabled($entity_type, $bundle)) {
611
              $t_args['%bundle_label'] = isset($bundle_info['label']) ? $bundle_info['label'] : $bundle;
612
              $permission["translate $bundle $entity_type"] = array(
613
                'title' => t('Translate %bundle_label @entity_label', $t_args),
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              );
            }
          }
          break;

        case 'entity_type':
620
          if (content_translation_enabled($entity_type)) {
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            $permission["translate $entity_type"] = array(
              'title' => t('Translate @entity_label', $t_args),
            );
          }
          break;
      }
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    }
  }

  return $permission;
}

/**
 * Implements hook_form_alter().
 */
636
function content_translation_form_alter(array &$form, array &$form_state) {
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  $form_controller = content_translation_form_controller($form_state);
  $entity = $form_controller ? $form_controller->getEntity() : NULL;

  if ($entity instanceof ContentEntityInterface && $entity->isTranslatable() && count($entity->getTranslationLanguages()) > 1) {
641
    $controller = content_translation_controller($entity->entityType());
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    $controller->entityFormAlter($form, $form_state, $entity);

    // @todo Move the following lines to the code generating the property form
    //   elements once we have an official #multilingual FAPI key.
    $translations = $entity->getTranslationLanguages();
    $form_langcode = $form_controller->getFormLangcode($form_state);

    // Handle fields shared between translations when there is at least one
    // translation available or a new one is being created.
    if (!$entity->isNew() && (!isset($translations[$form_langcode]) || count($translations) > 1)) {
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      foreach ($entity->getPropertyDefinitions() as $property_name => $definition) {
        if (isset($form[$property_name])) {
          $form[$property_name]['#multilingual'] = !empty($definition['translatable']);
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        }
      }
    }

  }
}

662
/**
663
 * Implements hook_language_fallback_candidates_OPERATION_alter().
664 665 666
 *
 * Performs language fallback for unaccessible translations.
 */
667 668 669 670 671
function content_translation_language_fallback_candidates_entity_view_alter(&$candidates, $context) {
  $entity = $context['data'];
  foreach ($entity->getTranslationLanguages() as $langcode => $language) {
    if (!content_translation_view_access($entity, $langcode)) {
      unset($candidates[$langcode]);
672 673 674 675
    }
  }
}

676 677 678
/**
 * Implements hook_entity_load().
 */
679
function content_translation_entity_load(array $entities, $entity_type) {
680 681
  $enabled_entities = array();

682
  if (content_translation_enabled($entity_type)) {
683
    foreach ($entities as $entity) {
684
      if ($entity instanceof ContentEntityInterface && $entity->isTranslatable()) {
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        $enabled_entities[$entity->id()] = $entity;
      }
    }
  }

  if (!empty($enabled_entities)) {
691
    content_translation_load_translation_metadata($enabled_entities, $entity_type);
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  }
}

/**
 * Loads translation data into the given entities.
 *
 * @param array $entities
 *   The entities keyed by entity ID.
 * @param string $entity_type
 *   The type of the entities.
 */
703 704
function content_translation_load_translation_metadata(array $entities, $entity_type) {
  $query = 'SELECT * FROM {content_translation} te WHERE te.entity_type = :entity_type AND te.entity_id IN (:entity_id)';
705
  $result = db_query($query, array(':entity_type' => $entity_type, ':entity_id' => array_keys($entities)));
706
  $exclude = array('entity_type', 'entity_id', 'langcode');
707 708 709
  foreach ($result as $record) {
    $entity = $entities[$record->entity_id];
    // @todo Declare these as entity (translation?) properties.
710 711
    foreach ($record as $field_name => $value) {
      if (!in_array($field_name, $exclude)) {
712 713 714 715 716
        $langcode = $record->langcode;
        $entity->translation[$langcode][$field_name] = $value;
        if (!$entity->hasTranslation($langcode)) {
          $entity->initTranslation($langcode);
        }
717 718
      }
    }
719 720 721 722 723 724
  }
}

/**
 * Implements hook_entity_insert().
 */
725
function content_translation_entity_insert(EntityInterface $entity) {
726
  // Only do something if translation support for the given entity is enabled.
727
  if (!($entity instanceof ContentEntityInterface) || !$entity->isTranslatable()) {
728 729 730
    return;
  }

731
  $fields = array('entity_type', 'entity_id', 'langcode', 'source', 'outdated', 'uid', 'status', 'created', 'changed');
732
  $query = db_insert('content_translation')->fields($fields);
733 734

  foreach ($entity->getTranslationLanguages() as $langcode => $language) {
735 736 737 738
    $translation = isset($entity->translation[$langcode]) ? $entity->translation[$langcode] : array();

    $translation += array(
      'source' => '',
739
      'uid' => $GLOBALS['user']->id(),
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      'outdated' => FALSE,
      'status' => TRUE,
      'created' => REQUEST_TIME,
      'changed' => REQUEST_TIME,
    );

    $translation['entity_type'] = $entity->entityType();
    $translation['entity_id'] = $entity->id();
    $translation['langcode'] = $langcode;

    // Reorder values to match the schema.
    $values = array();
    foreach ($fields as $field_name) {
      $value = is_bool($translation[$field_name]) ? intval($translation[$field_name]) : $translation[$field_name];
      $values[$field_name] = $value;
    }
    $query->values($values);
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  }

  $query->execute();
}

/**
 * Implements hook_entity_delete().
 */
765
function content_translation_entity_delete(EntityInterface $entity) {
766
  // Only do something if translation support for the given entity is enabled.
767
  if (!($entity instanceof ContentEntityInterface) || !$entity->isTranslatable()) {
768 769 770
    return;
  }

771
  db_delete('content_translation')
772 773 774 775 776 777 778 779
    ->condition('entity_type', $entity->entityType())
    ->condition('entity_id', $entity->id())
    ->execute();
}

/**
 * Implements hook_entity_update().
 */
780
function content_translation_entity_update(EntityInterface $entity) {
781
  // Only do something if translation support for the given entity is enabled.
782
  if (!($entity instanceof ContentEntityInterface) || !$entity->isTranslatable()) {
783 784 785
    return;
  }

786
  // Delete and create to ensure no stale value remains behind.
787 788
  content_translation_entity_delete($entity);
  content_translation_entity_insert($entity);
789 790 791 792 793
}

/**
 * Implements hook_field_extra_fields().
 */
794
function content_translation_field_extra_fields() {
795 796 797
  $extra = array();

  foreach (entity_get_info() as $entity_type => $info) {
798
    foreach (entity_get_bundles($entity_type) as $bundle => $bundle_info) {
799
      if (content_translation_enabled($entity_type, $bundle)) {
800 801 802 803 804 805 806 807 808 809 810 811 812
        $extra[$entity_type][$bundle]['form']['translation'] = array(
          'label' => t('Translation'),
          'description' => t('Translation settings'),
          'weight' => 10,
        );
      }
    }
  }

  return $extra;
}

/**
813
 * Implements hook_form_FORM_ID_alter() for 'field_ui_field_edit_form'.
814
 */
815
function content_translation_form_field_ui_field_edit_form_alter(array &$form, array &$form_state, $form_id) {
816
  $field = $form['#field'];
817 818 819
  $field_name = $field->getFieldName();
  $translatable = $field->isFieldTranslatable();
  $entity_type = $field->entity_type;
820
  $label = t('Field translation');
821

822
  if ($field->hasData()) {
823
    $form['field']['translatable'] = array(
824 825 826
      '#type' => 'item',
      '#title' => $label,
      '#attributes' => array('class' => 'translatable'),
827 828
      'link' => array(
        '#type' => 'link',
829 830
        '#prefix' => t('This field has data in existing content.') . ' ',
        '#title' => !$translatable ? t('Enable translation') : t('Disable translation'),
831
        '#href' => "admin/config/regional/content_translation/translatable/$entity_type/$field_name",
832
        '#options' => array('query' => drupal_get_destination()),
833
        '#access' => user_access('administer content translation'),
834 835 836 837 838 839
      ),
    );
  }
  else {
    $form['field']['translatable'] = array(
      '#type' => 'checkbox',
840
      '#title' => t('Users may translate this field.'),
841 842 843
      '#default_value' => $translatable,
    );
  }
844 845

  $form['field']['translatable']['#weight'] = 20;
846 847
}

848
/**
849
 * Implements hook_form_FORM_ID_alter() for 'field_ui_field_instance_edit_form'.
850
 */
851
function content_translation_form_field_ui_field_instance_edit_form_alter(array &$form, array &$form_state, $form_id) {
852
  if ($form['#field']->isFieldTranslatable()) {
853
    module_load_include('inc', 'content_translation', 'content_translation.admin');
854
    $element = content_translation_field_sync_widget($form['#field']);
855 856 857 858 859 860 861 862 863
    if ($element) {
      $form['instance']['settings']['translation_sync'] = $element;
    }
  }
}

/**
 * Implements hook_field_info_alter().
 */
864
function content_translation_field_info_alter(&$info) {
865 866 867 868 869 870 871 872 873
  foreach ($info as $field_type => &$field_type_info) {
    // By default no column has to be synchronized.
    $field_type_info['settings'] += array('translation_sync' => FALSE);
    // Synchronization can be enabled per instance.
    $field_type_info['instance_settings'] += array('translation_sync' => FALSE);
  }
}

/**
874
 * Implements hook_entity_presave().
875
 */
876
function content_translation_entity_presave(EntityInterface $entity) {
877
  if ($entity instanceof ContentEntityInterface && $entity->isTranslatable()) {
878 879
    // @todo Avoid using request attributes once translation metadata become
    //   regular fields.
880 881
    $attributes = \Drupal::request()->attributes;
    \Drupal::service('content_translation.synchronizer')->synchronizeFields($entity, $entity->language()->id, $attributes->get('source_langcode'));
882 883 884
  }
}

885 886 887
/**
 * Implements hook_element_info_alter().
 */
888
function content_translation_element_info_alter(&$type) {
889
  if (isset($type['language_configuration'])) {
890
    $type['language_configuration']['#process'][] = 'content_translation_language_configuration_element_process';
891 892
  }
}
893

894
/**
895
 * Returns a widget to enable content translation per entity bundle.
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
 *
 * Backward compatibility layer to support entities not using the language
 * configuration form element.
 *
 * @todo Remove once all core entities have language configuration.
 *
 * @param string $entity_type
 *   The type of the entity being configured for translation.
 * @param string $bundle
 *   The bundle of the entity being configured for translation.
 * @param array $form
 *   The configuration form array.
 * @param array $form_state
 *   The configuration form state array.
 */
911 912
function content_translation_enable_widget($entity_type, $bundle, array &$form, array &$form_state) {
  $key = $form_state['content_translation']['key'];
913 914 915 916
  if (!isset($form_state['language'][$key])) {
    $form_state['language'][$key] = array();
  }
  $form_state['language'][$key] += array('entity_type' => $entity_type, 'bundle' => $bundle);
917 918
  $element = content_translation_language_configuration_element_process(array('#name' => $key), $form_state, $form);
  unset($element['content_translation']['#element_validate']);
919 920 921 922 923 924 925 926 927 928 929 930
  return $element;
}

/**
 * Process callback: Expands the language_configuration form element.
 *
 * @param array $element
 *   Form API element.
 *
 * @return
 *   Processed language configuration element.
 */
931 932 933
function content_translation_language_configuration_element_process(array $element, array &$form_state, array &$form) {
  if (empty($element['#content_translation_skip_alter']) && user_access('administer content translation')) {
    $form_state['content_translation']['key'] = $element['#name'];
934
    $context = $form_state['language'][$element['#name']];
935

936
    $element['content_translation'] = array(
937 938
      '#type' => 'checkbox',
      '#title' => t('Enable translation'),
939 940
      '#default_value' => content_translation_enabled($context['entity_type'], $context['bundle']),
      '#element_validate' => array('content_translation_language_configuration_element_validate'),
941 942
      '#prefix' => '<label>' . t('Translation') . '</label>',
    );
943

944
    $form['actions']['submit']['#submit'][] = 'content_translation_language_configuration_element_submit';
945
  }
946 947 948 949
  return $element;
}

/**
950
 * Form validation handler for element added with content_translation_language_configuration_element_process().
951 952 953 954 955
 *
 * Checks whether translation can be enabled: if language is set to one of the
 * special languages and language selector is not hidden, translation cannot be
 * enabled.
 *
956
 * @see content_translation_language_configuration_element_submit()
957
 */
958 959
function content_translation_language_configuration_element_validate($element, array &$form_state, array $form) {
  $key = $form_state['content_translation']['key'];
960
  $values = $form_state['values'][$key];
961
  if (language_is_locked($values['langcode']) && !$values['language_show'] && $values['content_translation']) {
962
    foreach (language_list(Language::STATE_LOCKED) as $language) {
963 964 965 966 967
      $locked_languages[] = $language->name;
    }
    // @todo Set the correct form element name as soon as the element parents
    //   are correctly set. We should be using NestedArray::getValue() but for
    //   now we cannot.
968
    form_set_error('', t('"Show language selector" is not compatible with translating content that has default language: %choice. Either do not hide the language selector or pick a specific language.', array('%choice' => $locked_languages[$values['langcode']])));
969 970 971 972
  }
}

/**
973
 * Form submission handler for element added with content_translation_language_configuration_element_process().
974
 *
975
 * Stores the content translation settings.
976
 *
977
 * @see content_translation_language_configuration_element_validate()