From 5b8c2ac750e79e574b49e0ba7ac866f0d5002003 Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Fri, 27 Jun 2014 17:10:46 +0200
Subject: [PATCH] Use the etag to check for updates in webdav storages where
 available

---
 lib/private/files/storage/dav.php | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/private/files/storage/dav.php b/lib/private/files/storage/dav.php
index 8536c65ace..64c61873d0 100644
--- a/lib/private/files/storage/dav.php
+++ b/lib/private/files/storage/dav.php
@@ -449,5 +449,24 @@ class DAV extends \OC\Files\Storage\Common {
 			return 0;
 		}
 	}
+
+	/**
+	 * check if a file or folder has been updated since $time
+	 *
+	 * @param string $path
+	 * @param int $time
+	 * @return bool
+	 */
+	public function hasUpdated($path, $time) {
+		$this->init();
+		$response = $this->client->propfind($this->encodePath($path), array('{DAV:}getlastmodified', '{DAV:}getetag'));
+		if (isset($response['{DAV:}getetag'])) {
+			$cachedData = $this->getCache()->get($path);
+			return $cachedData['etag'] !== $response['{DAV:}getetag'];
+		} else {
+			$remoteMtime = strtotime($response['{DAV:}getlastmodified']);
+			return $remoteMtime > $time;
+		}
+	}
 }