Add a change propagator class to handle propagating etag and mtime changes

1 files changed, 98 insertions, 0 deletions

diff --git a/lib/private/files/cache/changepropagator.php b/lib/private/files/cache/changepropagator.php
new file mode 100644
index 00000000000..30f2e675e2e
--- /dev/null
+++ b/lib/private/files/cache/changepropagator.php
@@ -0,0 +1,98 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Files\Cache;
+
+/**
+ * Propagates changes in etag and mtime up the filesystem tree
+ *
+ * @package OC\Files\Cache
+ */
+class ChangePropagator {
+	/**
+	 * @var string[]
+	 */
+	protected $changedFiles = array();
+
+	/**
+	 * @var \OC\Files\View
+	 */
+	protected $view;
+
+	/**
+	 * @param \OC\Files\View $view
+	 */
+	public function __construct(\OC\Files\View $view) {
+		$this->view = $view;
+	}
+
+	public function addChange($path) {
+		$this->changedFiles[] = $path;
+	}
+
+	public function getChanges() {
+		return $this->changedFiles;
+	}
+
+	/**
+	 * propagate the registered changes to their parent folders
+	 *
+	 * @param int $time (optional) the mtime to set for the folders, if not set the current time is used
+	 */
+	public function propagateChanges($time = null) {
+		$parents = $this->getAllParents();
+		$this->changedFiles = array();
+		if (!$time) {
+			$time = time();
+		}
+		foreach ($parents as $parent) {
+			/**
+			 * @var \OC\Files\Storage\Storage $storage
+			 * @var string $internalPath
+			 */
+
+			list($storage, $internalPath) = $this->view->resolvePath($parent);
+			$cache = $storage->getCache();
+			$id = $cache->getId($internalPath);
+			$cache->update($id, array('mtime' => $time, 'etag' => $storage->getETag($internalPath)));
+		}
+	}
+
+	/**
+	 * @return string[]
+	 */
+	public function getAllParents() {
+		$parents = array();
+		foreach ($this->getChanges() as $path) {
+			$parents = array_values(array_unique(array_merge($parents, $this->getParents($path))));
+		}
+		return $parents;
+	}
+
+	/**
+	 * get all parent folders of $path
+	 *
+	 * @param string $path
+	 * @return string[]
+	 */
+	protected function getParents($path) {
+		$parts = explode('/', $path);
+
+		// remove the singe file
+		array_pop($parts);
+		$result = array('/');
+		$resultPath = '';
+		foreach ($parts as $part) {
+			if ($part) {
+				$resultPath .= '/' . $part;
+				$result[] = $resultPath;
+			}
+		}
+		return $result;
+	}
+}