refs#26028 fix files that create duplicates

modules/edw_document/src/Plugin/Field/FieldWidget/FileMultiLanguageWidget.php

@@ -98,14 +98,15 @@ public static function create(ContainerInterface $container, array $configuratio
   protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) {
     $fieldName = $this->fieldDefinition->getName();
     $languages = $this->languageManager->getLanguages();
+    $selectedValues = $form_state->getValue($fieldName);
     $currentLangcode = $this->languageManager->getCurrentLanguage()->getId();
-
     /** @var \Drupal\Core\Entity\ContentEntityBase $entity */
     $entity = $items->getEntity();
     $elements = [];
     $elements['#type'] = 'details';
     $elements['#open'] = TRUE;
     $elements['#title'] = $this->fieldDefinition->getLabel();
+    $elements['#element_validate'] = [[$this, 'validate']];
 
     $elements['languages'] = [
       '#type' => 'horizontal_tabs',
@@ -126,17 +127,49 @@ protected function formMultipleElements(FieldItemListInterface $items, array &$f
       $this->singleFieldIsRequired = $this->fieldDefinition->isRequired() && $language->isDefault();
 
       if ($entity->hasTranslation($language->getId())) {
-        $translatedField = $entity->getTranslation($language->getId())->get($fieldName);
+        $translatedField = $entity->getTranslation($language->getId())
+          ->get($fieldName);
         $elements['languages'][$language->getId()]['data'] = parent::formMultipleElements($translatedField, $form, $form_state);
+        $this->fixWidgetFileItems($elements, $selectedValues, $language->getId());
         continue;
       }
 
       $elements['languages'][$language->getId()]['data'] = parent::formMultipleElements($this->getEmptyField($items), $form, $form_state);
+      $this->fixWidgetFileItems($elements, $selectedValues, $language->getId());
     }
 
+
     return $elements;
   }
 
+  public function fixWidgetFileItems(array &$element, ?array $selectedValues, $langCode) {
+    if (empty($selectedValues) || array_key_exists($langCode, $selectedValues['languages'])) {
+      return;
+    }
+
+    foreach ($element['languages'][$langCode]['data'] as $key => $item) {
+      if (!is_array($item) || !isset($item['#default_value']['fids'])) {
+        continue;
+      }
+
+      $foundFile = FALSE;
+      foreach ($selectedValues['languages'] as $languageFile) {
+        if ($foundFile) {
+          break;
+        }
+
+        foreach ($languageFile['data'] as $selectedItem) {
+          $commonFids = array_intersect($selectedItem['fids'], $item['#default_value']['fids']);
+          if (!empty($commonFids)) {
+            unset($element['languages'][$langCode]['data'][$key]);
+            $foundFile = TRUE;
+            break;
+          }
+        }
+      }
+    }
+  }
+
   /**
    * {@inheritdoc}
    *
@@ -185,7 +218,8 @@ public function extractFormValues(FieldItemListInterface $items, array $form, Fo
         $entity->getTranslation($langcode) :
         $entity->addTranslation($langcode, $values);
 
-      $translationValues = array_column($translation->get($field_name)->getValue(), 'target_id');
+      $translationValues = array_column($translation->get($field_name)
+        ->getValue(), 'target_id');
       if (in_array($item['target_id'], $translationValues)) {
         continue;
       }
@@ -282,6 +316,66 @@ public function extractFormValuesMultiLanguage(FieldItemListInterface $items, ar
     }
   }
 
+  /**
+   * Validates if the same file is added on different languages.
+   *
+   * @param array $element
+   *   The widget form element.
+   * @param \Drupal\Core\Form\FormStateInterface $formState
+   *   The form state.
+   *
+   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
+   * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
+   */
+  public function validate(array $element, FormStateInterface $formState) {
+    $fileStorage = $this->entityTypeManager->getStorage('file');
+    $value = $formState->getValue($this->fieldDefinition->getName());
+    $userInput = $formState->getUserInput();
+    // Check if there is not an AJAX request.
+    if (!$formState->isSubmitted() || !empty($userInput['_drupal_ajax'])) {
+      return;
+    }
+
+    if (empty($value) || !isset($value['languages'])) {
+      return;
+    }
+
+    $fileLangMap = [];
+    foreach ($value['languages'] as $langCode => $items) {
+      if (!isset($items['data'])) {
+        continue;
+      }
+
+      foreach ($items['data'] as $item) {
+        foreach ($item['fids'] as $fid) {
+          /** @var \Drupal\file\Entity\File $file */
+          $file = $fileStorage->load($fid);
+          $sha = hash_file('sha256', $file->getFileUri());
+          if (!isset($fileLangMap[$sha])) {
+            $fileLangMap[$sha] = [$langCode];
+            continue;
+          }
+
+          if (!in_array($langCode, $fileLangMap[$sha])) {
+            $languages = [
+              $this->languageManager->getLanguage($fileLangMap[$sha][0])
+                ->getName(),
+            ];
+            $languages[] = $this->languageManager->getLanguage($langCode)
+              ->getName();
+
+            $formState->setError($element, $this->t('Same file, %fileName, appears multiple times for different languages: %languages.', [
+              '%fileName' => $file->getFilename(),
+              '%languages' => implode(', ', $languages),
+            ]));
+            return;
+          }
+        }
+      }
+    }
+
+  }
+
   /**
    * {@inheritdoc}
    */