--- /dev/null
+<?php
+
+namespace Drupal\content_translation\Plugin\Validation\Constraint;
+
+use Drupal\content_translation\ContentTranslationManagerInterface;
+use Drupal\content_translation\FieldTranslationSynchronizerInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Checks that synchronized fields are handled correctly in pending revisions.
+ *
+ * As for untranslatable fields, two modes are supported:
+ * - When changes to untranslatable fields are configured to affect all revision
+ * translations, synchronized field properties can be changed only in default
+ * revisions.
+ * - When changes to untranslatable fields affect are configured to affect only
+ * the revision's default translation, synchronized field properties can be
+ * changed only when editing the default translation. This may lead to
+ * temporarily desynchronized values, when saving a pending revision for the
+ * default translation that changes a synchronized property. These are
+ * actually synchronized when saving changes to the default translation as a
+ * new default revision.
+ *
+ * @see \Drupal\content_translation\Plugin\Validation\Constraint\ContentTranslationSynchronizedFieldsConstraint
+ * @see \Drupal\Core\Entity\Plugin\Validation\Constraint\EntityUntranslatableFieldsConstraintValidator
+ *
+ * @internal
+ */
+class ContentTranslationSynchronizedFieldsConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
+
+ /**
+ * The entity type manager.
+ *
+ * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+ */
+ protected $entityTypeManager;
+
+ /**
+ * The content translation manager.
+ *
+ * @var \Drupal\content_translation\ContentTranslationManagerInterface
+ */
+ protected $contentTranslationManager;
+
+ /**
+ * The field translation synchronizer.
+ *
+ * @var \Drupal\content_translation\FieldTranslationSynchronizerInterface
+ */
+ protected $synchronizer;
+
+ /**
+ * ContentTranslationSynchronizedFieldsConstraintValidator constructor.
+ *
+ * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+ * The entity type manager.
+ * @param \Drupal\content_translation\ContentTranslationManagerInterface $content_translation_manager
+ * The content translation manager.
+ * @param \Drupal\content_translation\FieldTranslationSynchronizerInterface $synchronizer
+ * The field translation synchronizer.
+ */
+ public function __construct(EntityTypeManagerInterface $entity_type_manager, ContentTranslationManagerInterface $content_translation_manager, FieldTranslationSynchronizerInterface $synchronizer) {
+ $this->entityTypeManager = $entity_type_manager;
+ $this->contentTranslationManager = $content_translation_manager;
+ $this->synchronizer = $synchronizer;
+ }
+
+ /**
+ * [@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('entity_type.manager'),
+ $container->get('content_translation.manager'),
+ $container->get('content_translation.synchronizer')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validate($value, Constraint $constraint) {
+ /** @var \Drupal\content_translation\Plugin\Validation\Constraint\ContentTranslationSynchronizedFieldsConstraint $constraint */
+ /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
+ $entity = $value;
+ if ($entity->isNew() || !$entity->getEntityType()->isRevisionable()) {
+ return;
+ }
+ // When changes to untranslatable fields are configured to affect all
+ // revision translations, we always allow changes in default revisions.
+ if ($entity->isDefaultRevision() && !$entity->isDefaultTranslationAffectedOnly()) {
+ return;
+ }
+ $entity_type_id = $entity->getEntityTypeId();
+ if (!$this->contentTranslationManager->isEnabled($entity_type_id, $entity->bundle())) {
+ return;
+ }
+ $synchronized_properties = $this->getSynchronizedPropertiesByField($entity->getFieldDefinitions());
+ if (!$synchronized_properties) {
+ return;
+ }
+
+ /** @var \Drupal\Core\Entity\ContentEntityInterface $original */
+ $original = $this->getOriginalEntity($entity);
+ $original_translation = $this->getOriginalTranslation($entity, $original);
+ if ($this->hasSynchronizedPropertyChanges($entity, $original_translation, $synchronized_properties)) {
+ if ($entity->isDefaultTranslationAffectedOnly()) {
+ foreach ($entity->getTranslationLanguages(FALSE) as $langcode => $language) {
+ if ($entity->getTranslation($langcode)->hasTranslationChanges()) {
+ $this->context->addViolation($constraint->defaultTranslationMessage);
+ break;
+ }
+ }
+ }
+ else {
+ $this->context->addViolation($constraint->defaultRevisionMessage);
+ }
+ }
+ }
+
+ /**
+ * Checks whether any synchronized property has changes.
+ *
+ * @param \Drupal\Core\Entity\ContentEntityInterface $entity
+ * The entity being validated.
+ * @param \Drupal\Core\Entity\ContentEntityInterface $original
+ * The original unchanged entity.
+ * @param string[][] $synchronized_properties
+ * An associative array of arrays of synchronized field properties keyed by
+ * field name.
+ *
+ * @return bool
+ * TRUE if changes in synchronized properties were detected, FALSE
+ * otherwise.
+ */
+ protected function hasSynchronizedPropertyChanges(ContentEntityInterface $entity, ContentEntityInterface $original, array $synchronized_properties) {
+ foreach ($synchronized_properties as $field_name => $properties) {
+ foreach ($properties as $property) {
+ $items = $entity->get($field_name)->getValue();
+ $original_items = $original->get($field_name)->getValue();
+ if (count($items) !== count($original_items)) {
+ return TRUE;
+ }
+ foreach ($items as $delta => $item) {
+ // @todo This loose comparison is not fully reliable. Revisit this
+ // after https://www.drupal.org/project/drupal/issues/2941092.
+ if ($items[$delta][$property] != $original_items[$delta][$property]) {
+ return TRUE;
+ }
+ }
+ }
+ }
+ return FALSE;
+ }
+
+ /**
+ * Returns the original unchanged entity to be used to detect changes.
+ *
+ * @param \Drupal\Core\Entity\ContentEntityInterface $entity
+ * The entity being changed.
+ *
+ * @return \Drupal\Core\Entity\ContentEntityInterface
+ * The unchanged entity.
+ */
+ protected function getOriginalEntity(ContentEntityInterface $entity) {
+ if (!isset($entity->original)) {
+ $storage = $this->entityTypeManager->getStorage($entity->getEntityTypeId());
+ $original = $entity->isDefaultRevision() ? $storage->loadUnchanged($entity->id()) : $storage->loadRevision($entity->getLoadedRevisionId());
+ }
+ else {
+ $original = $entity->original;
+ }
+ return $original;
+ }
+
+ /**
+ * Returns the original translation.
+ *
+ * @param \Drupal\Core\Entity\ContentEntityInterface $entity
+ * The entity being validated.
+ * @param \Drupal\Core\Entity\ContentEntityInterface $original
+ * The original entity.
+ *
+ * @return \Drupal\Core\Entity\ContentEntityInterface
+ * The original entity translation object.
+ */
+ protected function getOriginalTranslation(ContentEntityInterface $entity, ContentEntityInterface $original) {
+ $langcode = $entity->language()->getId();
+ if ($original->hasTranslation($langcode)) {
+ $original_langcode = $langcode;
+ }
+ else {
+ $metadata = $this->contentTranslationManager->getTranslationMetadata($entity);
+ $original_langcode = $metadata->getSource();
+ }
+ return $original->getTranslation($original_langcode);
+ }
+
+ /**
+ * Returns the synchronized properties for every specified field.
+ *
+ * @param \Drupal\Core\Field\FieldDefinitionInterface[] $field_definitions
+ * An array of field definitions.
+ *
+ * @return string[][]
+ * An associative array of arrays of field property names keyed by field
+ * name.
+ */
+ public function getSynchronizedPropertiesByField(array $field_definitions) {
+ $synchronizer = $this->synchronizer;
+ $synchronized_properties = array_filter(array_map(
+ function (FieldDefinitionInterface $field_definition) use ($synchronizer) {
+ return $synchronizer->getFieldSynchronizedProperties($field_definition);
+ },
+ $field_definitions
+ ));
+ return $synchronized_properties;
+ }
+
+}