content_translation.module 38.6 KB
Newer Older
1 2 3 4 5 6 7 8
<?php

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

use Drupal\Core\Language\Language;
9
use Drupal\Core\Session\AccountInterface;
10 11 12 13 14 15 16
use Drupal\Core\Entity\EntityFormControllerInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityNG;

/**
 * Implements hook_help().
 */
17
function content_translation_help($path, $arg) {
18
  switch ($path) {
19
    case 'admin/help#content_translation':
20 21
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
22
      $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>';
23 24 25
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Enabling translation') . '</dt>';
26
      $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>';
27
      $output .= '<p>' . t('After adding languages, <a href="!url">configure translation</a>.', array('!url' => url('admin/config/regional/content-language'))) . '</p>';
28
      $output .= '<dt>' . t('Translating content') . '</dt>';
29
      $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>';
30 31 32 33 34
      $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>';
35
      $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>';
36 37
      $output .= '</dl>';
      return $output;
38 39 40 41

    case 'admin/config/regional/content-language':
      $output = '';
      if (!language_multilingual()) {
42
        $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')));
43 44
      }
      return $output;
45 46 47
  }
}

48 49 50
/**
 * Implements hook_module_implements_alter().
 */
51
function content_translation_module_implements_alter(&$implementations, $hook) {
52 53 54 55
  switch ($hook) {
    // Move some of our hook implementations to the end of the list.
    case 'menu_alter':
    case 'entity_info_alter':
56 57 58
      $group = $implementations['content_translation'];
      unset($implementations['content_translation']);
      $implementations['content_translation'] = $group;
59 60 61 62
      break;
  }
}

63 64 65
/**
 * Implements hook_language_type_info_alter().
 */
66
function content_translation_language_types_info_alter(array &$language_types) {
67 68 69
  // Make content language negotiation configurable by removing the 'locked'
  // flag.
  $language_types[Language::TYPE_CONTENT]['locked'] = FALSE;
70
  unset($language_types[Language::TYPE_CONTENT]['fixed']);
71 72 73 74 75
}

/**
 * Implements hook_entity_info_alter().
 */
76
function content_translation_entity_info_alter(array &$entity_info) {
77 78
  // Provide defaults for translation info.
  foreach ($entity_info as $entity_type => &$info) {
79 80 81 82
    if (empty($info['translatable'])) {
      continue;
    }

83 84
    if (!isset($info['translation']['content_translation'])) {
      $info['translation']['content_translation'] = array();
85 86 87 88 89 90
    }

    // 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.
91
    $info['controllers'] += array('translation' => 'Drupal\content_translation\ContentTranslationController');
92

93 94 95 96 97
    // If no menu base path is provided we default to the usual
    // "entity_type/%entity_type" pattern.
    if (!isset($info['menu_base_path'])) {
      $path = "$entity_type/%$entity_type";
      $info['menu_base_path'] = $path;
98 99
    }

100
    $path = $info['menu_base_path'];
101

102 103 104 105 106
    $info += array(
      'menu_view_path' => $path,
      'menu_edit_path' => "$path/edit",
      'menu_path_wildcard' => "%$entity_type",
    );
107

108
    $entity_position = count(explode('/', $path)) - 1;
109 110
    $info['translation']['content_translation'] += array(
      'access_callback' => 'content_translation_translate_access',
111 112 113 114
      'access_arguments' => array($entity_position),
    );
  }
}
115

116 117 118
/**
 * Implements hook_entity_bundle_info_alter().
 */
119
function content_translation_entity_bundle_info_alter(&$bundles) {
120 121
  foreach ($bundles as $entity_type => &$info) {
    foreach ($info as $bundle => &$bundle_info) {
122
      $enabled = content_translation_get_config($entity_type, $bundle, 'enabled');
123
      $bundle_info['translatable'] = !empty($enabled);
124 125 126 127 128 129 130
    }
  }
}

/**
 * Implements hook_menu().
 */
131
function content_translation_menu() {
132 133 134 135 136
  $items = array();

  // Create tabs for all possible entity types.
  foreach (entity_get_info() as $entity_type => $info) {
    // Provide the translation UI only for enabled types.
137
    if (content_translation_enabled($entity_type)) {
138 139 140
      $path = $info['menu_base_path'];
      $entity_position = count(explode('/', $path)) - 1;
      $keys = array_flip(array('theme_callback', 'theme_arguments', 'access_callback', 'access_arguments', 'load_arguments'));
141
      $menu_info = array_intersect_key($info['translation']['content_translation'], $keys) + array('file' => 'content_translation.pages.inc');
142 143 144 145 146 147 148 149 150
      $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(
151
        'title' => 'Translate',
152
        'route_name' => "content_translation.translation_overview_$entity_type",
153
        'type' => MENU_LOCAL_TASK,
154
        'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
155 156 157
        'weight' => 2,
      ) + $item;

158 159 160 161 162 163
      $items["$path/translations/overview"] = array(
        'title' => 'Overview',
        'type' => MENU_DEFAULT_LOCAL_TASK,
        'weight' => 0,
      );

164 165 166 167 168
      // 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);
169
      $items["$path/translations/add/%language/%language"] = array(
170
        'title' => 'Add',
171
        'route_name' => "content_translation.translation_add_$entity_type",
172
        'weight' => 1,
173
      );
174 175 176 177 178

      // Edit translation callback.
      $args = array($entity_position, $language_position);
      $items["$path/translations/edit/%language"] = array(
        'title' => 'Edit',
179
        'route_name' => "content_translation.translation_edit_$entity_type",
180
        'weight' => 1,
181
      );
182 183 184 185 186

      // Delete translation callback.
      $items["$path/translations/delete/%language"] = array(
        'title' => 'Delete',
        'page callback' => 'drupal_get_form',
187 188
        'page arguments' => array('content_translation_delete_confirm', $entity_position, $language_position),
        'access callback' => 'content_translation_delete_access',
189
        'access arguments' => $args,
190 191 192 193
      ) + $item;
    }
  }

194
  $items['admin/config/regional/content_translation/translatable/%/%'] = array(
195 196
    'title' => 'Confirm change in translatability.',
    'description' => 'Confirm page for changing field translatability.',
197
    'route_name' => 'content_translation.translatable',
198 199 200 201 202 203 204 205
  );

  return $items;
}

/**
 * Implements hook_menu_alter().
 */
206
function content_translation_menu_alter(array &$items) {
207 208
  // Check that the declared menu base paths are actually valid.
  foreach (entity_get_info() as $entity_type => $info) {
209
    if (content_translation_enabled($entity_type)) {
210 211
      $path = $info['menu_base_path'];

212 213 214 215
      // 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().
216
      if (!isset($items[$path]) && !isset($items["$path/edit"])
217
          && !isset($items[_content_translation_menu_strip_loaders($path)])) {
218 219
        unset(
          $items["$path/translations"],
220
          $items["$path/translations/add/%language/%language"],
221 222
          $items["$path/translations/delete/%language"]
        );
223
        $t_args = array('@entity_type' => isset($info['label']) ? $info['label'] : $entity_type);
224
        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);
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
      }
      else {
        $entity_position = count(explode('/', $path)) - 1;
        $edit_path = $info['menu_edit_path'];

        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;
          }
        }
      }
    }
  }
}

250 251 252 253 254 255 256 257 258
/**
 * Strips out menu loaders from the given path.
 *
 * @param string $path
 *   The path to process.
 *
 * @return
 *   The given path where all the menu loaders are replaced with "%".
 */
259
function _content_translation_menu_strip_loaders($path) {
260 261 262
  return preg_replace('|%[^/]+|', '%', $path);
}

263 264 265 266 267 268
/**
 * Access callback for the translation overview page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity whose translation overview should be displayed.
 */
269
function content_translation_translate_access(EntityInterface $entity) {
270
  $entity_type = $entity->entityType();
271
  return empty($entity->getUntranslated()->language()->locked) && language_multilingual() && $entity->isTranslatable() &&
272
    (user_access('create content translations') || user_access('update content translations') || user_access('delete content translations'));
273 274
}

275 276 277 278 279 280 281
/**
 * 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.
282
 * @param \Drupal\Core\Session\AccountInterface $account
283 284 285
 *   (optional) The account for which view access should be checked. Defaults to
 *   the current user.
 */
286
function content_translation_view_access(EntityInterface $entity, $langcode, AccountInterface $account = NULL) {
287 288 289 290
  $entity_type = $entity->entityType();
  return !empty($entity->translation[$langcode]['status']) || user_access('translate any entity', $account) || user_access("translate $entity_type entities", $account);
}

291 292 293 294 295 296
/**
 * Access callback for the translation addition page.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity being translated.
 * @param \Drupal\Core\Language\Language $source
297 298
 *   (optional) The language of the values being translated. Defaults to the
 *   entity language.
299
 * @param \Drupal\Core\Language\Language $target
300 301
 *   (optional) The language of the translated values. Defaults to the current
 *   content language.
302
 */
303
function content_translation_add_access(EntityInterface $entity, Language $source = NULL, Language $target = NULL) {
304
  $source = !empty($source) ? $source : $entity->language();
305
  $target = !empty($target) ? $target : language(Language::TYPE_CONTENT);
306 307
  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
308
  return $source->id != $target->id && isset($languages[$source->id]) && isset($languages[$target->id]) && !isset($translations[$target->id]) && content_translation_access($entity, 'create');
309 310 311 312 313 314 315 316 317 318 319
}

/**
 * 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.
 */
320
function content_translation_edit_access(EntityInterface $entity, Language $language = NULL) {
321
  $language = !empty($language) ? $language : language(Language::TYPE_CONTENT);
322 323
  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
324
  return isset($languages[$language->id]) && $language->id != $entity->getUntranslated()->language()->id && isset($translations[$language->id]) && content_translation_access($entity, 'update');
325 326 327 328 329 330 331 332 333 334 335
}

/**
 * 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.
 */
336
function content_translation_delete_access(EntityInterface $entity, Language $language = NULL) {
337
  $language = !empty($language) ? $language : language(Language::TYPE_CONTENT);
338 339
  $translations = $entity->getTranslationLanguages();
  $languages = language_list();
340
  return isset($languages[$language->id]) && $language->id != $entity->getUntranslated()->language()->id && isset($translations[$language->id]) && content_translation_access($entity, 'delete');
341 342
}

343 344 345
/**
 * Implements hook_library_info().
 */
346 347 348 349
function content_translation_library_info() {
  $path = drupal_get_path('module', 'content_translation');
  $libraries['drupal.content_translation.admin'] = array(
    'title' => 'Content translation UI',
350
    'version' => \Drupal::VERSION,
351
    'js' => array(
352
      $path . '/content_translation.admin.js' => array(),
353 354
    ),
    'css' => array(
355
      $path . '/css/content_translation.admin.css' => array(),
356 357 358 359 360 361 362 363 364 365 366
    ),
    'dependencies' => array(
      array('system', 'jquery'),
      array('system', 'drupal'),
      array('system', 'jquery.once'),
    ),
  );

  return $libraries;
}

367
/**
368
 * Returns the key name used to store the configuration setting.
369
 *
370 371
 * Based on the entity type and bundle, the keys used to store configuration
 * will have a common root name.
372 373 374 375 376 377 378 379 380
 *
 * @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 $setting
 *   The name of the setting.
 *
 * @return string
381
 *   The key name of the configuration setting.
382 383 384 385
 *
 * @todo Generalize this logic so that it is available to any module needing
 *   per-bundle configuration.
 */
386
function content_translation_get_config_key($entity_type, $bundle, $setting) {
387 388
  $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $entity_type);
  $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $bundle);
389
  return $entity_type . '.' . $bundle . '.content_translation.' . $setting;
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
}

/**
 * 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 $setting
 *   The name of the setting.
 *
 * @returns mixed
 *   The stored value for the given setting.
 */
405 406
function content_translation_get_config($entity_type, $bundle, $setting) {
  $key = content_translation_get_config_key($entity_type, $bundle, $setting);
407
  return \Drupal::config('content_translation.settings')->get($key);
408 409 410 411 412 413 414 415 416 417 418 419 420 421
}

/**
 * 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 $value
 *   The value to be stored for the given setting.
 */
422 423
function content_translation_set_config($entity_type, $bundle, $setting, $value) {
  $key = content_translation_get_config_key($entity_type, $bundle, $setting);
424
  return \Drupal::config('content_translation.settings')->set($key, $value)->save();
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
}

/**
 * Determines whether the given entity type is translatable.
 *
 * @param string $entity_type
 *   The type of the entity.
 * @param string $bundle
 *   (optional) The bundle of the entity. If no bundle is provided, all the
 *   available bundles are checked.
 *
 * @returns
 *   TRUE if the specified bundle is translatable. If no bundle is provided
 *   returns TRUE if at least one of the entity bundles is translatable.
 */
440
function content_translation_enabled($entity_type, $bundle = NULL) {
441
  $enabled = FALSE;
442
  $info = entity_get_info($entity_type);
443

444 445 446
  if (!empty($info['translatable'])) {
    $bundles = !empty($bundle) ? array($bundle) : array_keys(entity_get_bundles($entity_type));
    foreach ($bundles as $bundle) {
447
      if (content_translation_get_config($entity_type, $bundle, 'enabled')) {
448 449 450
        $enabled = TRUE;
        break;
      }
451 452 453
    }
  }

454
  return $enabled;
455 456
}

457 458 459 460 461 462
/**
 * Returns all the translatable entity types.
 *
 * @return array
 *   An array of entity types keyed by entity type.
 */
463
function content_translation_types_translatable() {
464 465 466
  $entity_types = &drupal_static(__FUNCTION__, array());

  foreach (entity_get_info() as $entity_type => $info) {
467
    if (content_translation_enabled($entity_type)) {
468 469 470 471 472 473 474
      // Lazy load router items.
      if (!isset($items)) {
        $items = menu_get_router();
      }
      // Check whether the required paths are defined. We need to strip out the
      // menu loader and replace it with a plain "%" as router items have no
      // menu loader in them.
475
      $path = _content_translation_menu_strip_loaders($info['menu_base_path']);
476 477 478 479 480 481 482 483 484
      if (!empty($items[$path]) && !empty($items[$path . '/translations'])) {
        $entity_types[$entity_type] = $entity_type;
      }
    }
  }

  return $entity_types;
}

485
/**
486
 * Content translation controller factory.
487 488 489 490
 *
 * @param string $entity_type
 *   The type of the entity being translated.
 *
491 492
 * @return \Drupal\content_translation\ContentTranslationControllerInterface
 *   An instance of the content translation controller interface.
493
 */
494
function content_translation_controller($entity_type) {
495 496
  $entity_info = entity_get_info($entity_type);
  // @todo Throw an exception if the key is missing.
497
  return new $entity_info['controllers']['translation']($entity_type, $entity_info);
498 499 500 501 502 503 504 505 506
}

/**
 * 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;
507
 *   An instance of the content translation form interface or FALSE if not an
508 509
 *   entity form.
 */
510
function content_translation_form_controller(array $form_state) {
511 512 513 514
  return isset($form_state['controller']) && $form_state['controller'] instanceof EntityFormControllerInterface ? $form_state['controller'] : FALSE;
}

/**
515
 * Checks whether a content translation is accessible.
516 517 518
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 *   The entity to be accessed.
519 520 521 522 523 524
 * @param $op
 *   The operation to be performed on the translation. Possible values are:
 *   - "view"
 *   - "update"
 *   - "delete"
 *   - "create"
525 526 527 528
 *
 * @return
 *   TRUE if the current user is allowed to view the translation.
 */
529 530
function content_translation_access(EntityInterface $entity, $op) {
  return content_translation_controller($entity->entityType())->getTranslationAccess($entity, $op) ;
531 532 533 534 535
}

/**
 * Implements hook_permission().
 */
536
function content_translation_permission() {
537
  $permission = array(
538
    'administer content translation' => array(
539
      'title' => t('Administer translation settings'),
540
      'description' => t('Configure translatability of entities and fields.'),
541
    ),
542
    'create content translations' => array(
543 544
      'title' => t('Create translations'),
    ),
545
    'update content translations' => array(
546 547
      'title' => t('Edit translations'),
    ),
548
    'delete content translations' => array(
549 550
      'title' => t('Delete translations'),
    ),
551 552 553 554 555
    'translate any entity' => array(
      'title' => t('Translate any entity'),
    ),
  );

556 557
  // Create a translate permission for each enabled entity type and (optionally)
  // bundle.
558
  foreach (entity_get_info() as $entity_type => $info) {
559 560 561 562 563 564
    if (!empty($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 => $bundle_info) {
565
            if (content_translation_enabled($entity_type, $bundle)) {
566
              $t_args['%bundle_label'] = isset($bundle_info['label']) ? $bundle_info['label'] : $bundle;
567
              $permission["translate $bundle $entity_type"] = array(
568
                'title' => t('Translate %bundle_label @entity_label', $t_args),
569 570 571 572 573 574
              );
            }
          }
          break;

        case 'entity_type':
575
          if (content_translation_enabled($entity_type)) {
576 577 578 579 580 581
            $permission["translate $entity_type"] = array(
              'title' => t('Translate @entity_label', $t_args),
            );
          }
          break;
      }
582 583 584 585 586 587 588 589 590
    }
  }

  return $permission;
}

/**
 * Implements hook_form_alter().
 */
591 592 593
function content_translation_form_alter(array &$form, array &$form_state) {
  if (($form_controller = content_translation_form_controller($form_state)) && ($entity = $form_controller->getEntity()) && !$entity->isNew() && $entity->isTranslatable()) {
    $controller = content_translation_controller($entity->entityType());
594 595 596 597 598 599 600 601 602 603
    $controller->entityFormAlter($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)) {
604 605 606
      foreach ($entity->getPropertyDefinitions() as $property_name => $definition) {
        if (isset($form[$property_name])) {
          $form[$property_name]['#multilingual'] = !empty($definition['translatable']);
607 608 609 610 611 612 613
        }
      }
    }

  }
}

614 615 616 617 618
/**
 * Implements hook_field_language_alter().
 *
 * Performs language fallback for unaccessible translations.
 */
619
function content_translation_field_language_alter(&$display_language, $context) {
620 621 622
  $entity = $context['entity'];
  $entity_type = $entity->entityType();

623
  if (isset($entity->translation[$context['langcode']]) && $entity->isTranslatable() && !content_translation_view_access($entity, $context['langcode'])) {
624 625 626
    $instances = field_info_instances($entity_type, $entity->bundle());
    // Avoid altering the real entity.
    $entity = clone($entity);
627
    $entity_langcode = $entity->getUntranslated()->language()->id;
628 629

    foreach ($entity->translation as $langcode => $translation) {
630
      if ($langcode == $context['langcode'] || !content_translation_view_access($entity, $langcode)) {
631
        $entity->removeTranslation($langcode);
632 633 634 635 636 637 638 639
      }
    }

    // Find the new fallback values.
    field_language_fallback($display_language, $entity, $context['langcode']);
  }
}

640 641 642
/**
 * Implements hook_entity_load().
 */
643
function content_translation_entity_load(array $entities, $entity_type) {
644 645
  $enabled_entities = array();

646
  if (content_translation_enabled($entity_type)) {
647
    foreach ($entities as $entity) {
648
      if ($entity->isTranslatable()) {
649 650 651 652 653 654
        $enabled_entities[$entity->id()] = $entity;
      }
    }
  }

  if (!empty($enabled_entities)) {
655
    content_translation_load_translation_metadata($enabled_entities, $entity_type);
656 657 658 659 660 661 662 663 664 665 666
  }
}

/**
 * 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.
 */
667 668
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)';
669
  $result = db_query($query, array(':entity_type' => $entity_type, ':entity_id' => array_keys($entities)));
670
  $exclude = array('entity_type', 'entity_id', 'langcode');
671 672 673
  foreach ($result as $record) {
    $entity = $entities[$record->entity_id];
    // @todo Declare these as entity (translation?) properties.
674 675
    foreach ($record as $field_name => $value) {
      if (!in_array($field_name, $exclude)) {
676 677 678 679 680
        $langcode = $record->langcode;
        $entity->translation[$langcode][$field_name] = $value;
        if (!$entity->hasTranslation($langcode)) {
          $entity->initTranslation($langcode);
        }
681 682
      }
    }
683 684 685 686 687 688
  }
}

/**
 * Implements hook_entity_insert().
 */
689
function content_translation_entity_insert(EntityInterface $entity) {
690
  // Only do something if translation support for the given entity is enabled.
691
  if (!$entity->isTranslatable()) {
692 693 694
    return;
  }

695
  $fields = array('entity_type', 'entity_id', 'langcode', 'source', 'outdated', 'uid', 'status', 'created', 'changed');
696
  $query = db_insert('content_translation')->fields($fields);
697 698

  foreach ($entity->getTranslationLanguages() as $langcode => $language) {
699 700 701 702
    $translation = isset($entity->translation[$langcode]) ? $entity->translation[$langcode] : array();

    $translation += array(
      'source' => '',
703
      'uid' => $GLOBALS['user']->id(),
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
      '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);
721 722 723 724 725 726 727 728
  }

  $query->execute();
}

/**
 * Implements hook_entity_delete().
 */
729
function content_translation_entity_delete(EntityInterface $entity) {
730
  // Only do something if translation support for the given entity is enabled.
731
  if (!$entity->isTranslatable()) {
732 733 734
    return;
  }

735
  db_delete('content_translation')
736 737 738 739 740 741 742 743
    ->condition('entity_type', $entity->entityType())
    ->condition('entity_id', $entity->id())
    ->execute();
}

/**
 * Implements hook_entity_update().
 */
744
function content_translation_entity_update(EntityInterface $entity) {
745
  // Only do something if translation support for the given entity is enabled.
746
  if (!$entity->isTranslatable()) {
747 748 749
    return;
  }

750
  // Delete and create to ensure no stale value remains behind.
751 752
  content_translation_entity_delete($entity);
  content_translation_entity_insert($entity);
753 754 755 756 757
}

/**
 * Implements hook_field_extra_fields().
 */
758
function content_translation_field_extra_fields() {
759 760 761
  $extra = array();

  foreach (entity_get_info() as $entity_type => $info) {
762
    foreach (entity_get_bundles($entity_type) as $bundle => $bundle_info) {
763
      if (content_translation_enabled($entity_type, $bundle)) {
764 765 766 767 768 769 770 771 772 773 774 775 776
        $extra[$entity_type][$bundle]['form']['translation'] = array(
          'label' => t('Translation'),
          'description' => t('Translation settings'),
          'weight' => 10,
        );
      }
    }
  }

  return $extra;
}

/**
777
 * Implements hook_form_FORM_ID_alter() for 'field_ui_field_edit_form'.
778
 */
779
function content_translation_form_field_ui_field_edit_form_alter(array &$form, array &$form_state, $form_id) {
780
  $field = $form['#field'];
781
  $entity_type = $field['entity_type'];
782 783
  $field_name = $field['field_name'];
  $translatable = $field['translatable'];
784
  $label = t('Field translation');
785

786
  if ($field->hasData()) {
787
    $form['field']['translatable'] = array(
788 789 790
      '#type' => 'item',
      '#title' => $label,
      '#attributes' => array('class' => 'translatable'),
791 792
      'link' => array(
        '#type' => 'link',
793 794
        '#prefix' => t('This field has data in existing content.') . ' ',
        '#title' => !$translatable ? t('Enable translation') : t('Disable translation'),
795
        '#href' => "admin/config/regional/content_translation/translatable/$entity_type/$field_name",
796
        '#options' => array('query' => drupal_get_destination()),
797
        '#access' => user_access('administer content translation'),
798 799 800 801 802 803
      ),
    );
  }
  else {
    $form['field']['translatable'] = array(
      '#type' => 'checkbox',
804
      '#title' => t('Users may translate this field.'),
805 806 807
      '#default_value' => $translatable,
    );
  }
808 809

  $form['field']['translatable']['#weight'] = 20;
810 811
}

812
/**
813
 * Implements hook_form_FORM_ID_alter() for 'field_ui_field_instance_edit_form'.
814
 */
815
function content_translation_form_field_ui_field_instance_edit_form_alter(array &$form, array &$form_state, $form_id) {
816
  if ($form['#field']['translatable']) {
817 818
    module_load_include('inc', 'content_translation', 'content_translation.admin');
    $element = content_translation_field_sync_widget($form['#field'], $form['#instance']);
819 820 821 822 823 824 825 826 827
    if ($element) {
      $form['instance']['settings']['translation_sync'] = $element;
    }
  }
}

/**
 * Implements hook_field_info_alter().
 */
828
function content_translation_field_info_alter(&$info) {
829 830 831 832 833 834 835 836 837
  foreach ($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);
  }
}

/**
838
 * Implements hook_entity_presave().
839
 */
840
function content_translation_entity_presave(EntityInterface $entity) {
841 842 843
  if ($entity->isTranslatable()) {
    // @todo Avoid using request attributes once translation metadata become
    //   regular fields.
844 845
    $attributes = \Drupal::request()->attributes;
    \Drupal::service('content_translation.synchronizer')->synchronizeFields($entity, $entity->language()->id, $attributes->get('source_langcode'));
846 847 848
  }
}

849 850 851
/**
 * Implements hook_element_info_alter().
 */
852
function content_translation_element_info_alter(&$type) {
853
  if (isset($type['language_configuration'])) {
854
    $type['language_configuration']['#process'][] = 'content_translation_language_configuration_element_process';
855 856
  }
}
857

858
/**
859
 * Returns a widget to enable content translation per entity bundle.
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
 *
 * 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 $form_state
 *   The configuration form state array.
 */
875 876
function content_translation_enable_widget($entity_type, $bundle, array &$form, array &$form_state) {
  $key = $form_state['content_translation']['key'];
877 878 879 880
  if (!isset($form_state['language'][$key])) {
    $form_state['language'][$key] = array();
  }
  $form_state['language'][$key] += array('entity_type' => $entity_type, 'bundle' => $bundle);
881 882
  $element = content_translation_language_configuration_element_process(array('#name' => $key), $form_state, $form);
  unset($element['content_translation']['#element_validate']);
883 884 885 886 887 888 889 890 891 892 893 894
  return $element;
}

/**
 * Process callback: Expands the language_configuration form element.
 *
 * @param array $element
 *   Form API element.
 *
 * @return
 *   Processed language configuration element.
 */
895 896 897
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'];
898
    $context = $form_state['language'][$element['#name']];
899

900
    $element['content_translation'] = array(
901 902
      '#type' => 'checkbox',
      '#title' => t('Enable translation'),
903 904
      '#default_value' => content_translation_enabled($context['entity_type'], $context['bundle']),
      '#element_validate' => array('content_translation_language_configuration_element_validate'),
905 906
      '#prefix' => '<label>' . t('Translation') . '</label>',
    );
907

908
    $form['actions']['submit']['#submit'][] = 'content_translation_language_configuration_element_submit';
909
  }
910 911 912 913
  return $element;
}

/**
914
 * Form validation handler for element added with content_translation_language_configuration_element_process().
915 916 917 918 919
 *
 * 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.
 *
920
 * @see content_translation_language_configuration_element_submit()
921
 */
922 923
function content_translation_language_configuration_element_validate($element, array &$form_state, array $form) {
  $key = $form_state['content_translation']['key'];
924
  $values = $form_state['values'][$key];
925
  if (language_is_locked($values['langcode']) && !$values['language_show'] && $values['content_translation']) {
926
    foreach (language_list(Language::STATE_LOCKED) as $language) {
927 928 929 930 931
      $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.
932
    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']])));
933