1 files changed, 66 insertions, 0 deletions
diff --git a/lib/private/files/cache/propagator.php b/lib/private/files/cache/propagator.php
new file mode 100644
index 00000000000..bd11cef5990
--- /dev/null
+++ b/lib/private/files/cache/propagator.php
@@ -0,0 +1,66 @@
+<?php
+/**
+ * @author Robin Appelman <icewind@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Files\Cache;
+
+/**
+ * Propagate etags and mtimes within the storage
+ */
+class Propagator {
+	/**
+	 * @var \OC\Files\Storage\Storage
+	 */
+	protected $storage;
+
+	/**
+	 * @param \OC\Files\Storage\Storage $storage
+	 */
+	public function __construct(\OC\Files\Storage\Storage $storage) {
+		$this->storage = $storage;
+	}
+
+
+	/**
+	 * @param string $internalPath
+	 * @param int $time
+	 * @return array[] all propagated entries
+	 */
+	public function propagateChange($internalPath, $time) {
+		$cache = $this->storage->getCache($internalPath);
+
+		$parentId = $cache->getParentId($internalPath);
+		$propagatedEntries = [];
+		while ($parentId !== -1) {
+			$entry = $cache->get($parentId);
+			$propagatedEntries[] = $entry;
+			if (!$entry) {
+				return $propagatedEntries;
+			}
+			$mtime = max($time, $entry['mtime']);
+
+			$cache->update($parentId, ['mtime' => $mtime, 'etag' => $this->storage->getETag($entry['path'])]);
+
+			$parentId = $entry['parent'];
+		}
+
+		return $propagatedEntries;
+	}
+}