Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/locale/src/StreamWrapper/TranslationsStream.php

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\locale\StreamWrapper\TranslationsStream.
+ */
+
+namespace Drupal\locale\StreamWrapper;
+
+use Drupal\Core\Annotation\StreamWrapper;
+use Drupal\Core\Annotation\Translation;
+use Drupal\Core\StreamWrapper\LocalStream;
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+
+/**
+ * Defines a Drupal translations (translations://) stream wrapper class.
+ *
+ * Provides support for storing translation files.
+ */
+class TranslationsStream extends LocalStream {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getType() {
+    return StreamWrapperInterface::LOCAL_HIDDEN;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return t('Translation files');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return t('Translation files');
+  }
+
+  /**
+   * Implements Drupal\Core\StreamWrapper\LocalStream::getDirectoryPath()
+   */
+  function getDirectoryPath() {
+    return \Drupal::config('locale.settings')->get('translation.path');
+  }
+
+  /**
+   * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getExternalUrl().
+   * @throws \LogicException PO files URL should not be public.
+   */
+  function getExternalUrl() {
+    throw new \LogicException('PO files URL should not be public.');
+  }
+}