adding OC-ETag header

lib/private/connector/sabre/file.php

@@ -247,8 +247,7 @@ class File extends \OC\Connector\Sabre\Node implements \Sabre\DAV\IFile {
 	 * @throws \Sabre\DAV\Exception\NotImplemented
 	 * @throws \Sabre\DAV\Exception\ServiceUnavailable
 	 */
-	private function createFileChunked($data)
-	{
+	private function createFileChunked($data) {
 		list($path, $name) = \Sabre\HTTP\URLUtil::splitPath($this->path);
 
 		$info = \OC_FileChunking::decodeName($name);
@@ -305,6 +304,8 @@ class File extends \OC\Connector\Sabre\Node implements \Sabre\DAV\IFile {
 					}
 				}
 
+				// mark chunking complete
+				$_SERVER['X-CHUNKING_COMPLETE'] = true;
 				$info = $this->fileView->getFileInfo($targetPath);
 				return $info->getEtag();
 			} catch (\OCP\Files\StorageNotAvailableException $e) {

lib/private/connector/sabre/filesplugin.php

@@ -174,7 +174,24 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 			if (!is_null($fileId)) {
 				$this->server->httpResponse->setHeader('OC-FileId', $fileId);
 			}
+			$eTag = $this->getETag($node);
+			if (!is_null($eTag)) {
+				$this->server->httpResponse->setHeader('OC-ETag', $eTag);
+			}
+		}
+	}
+
+	/**
+	 * @param \OC\Connector\Sabre\Node $node
+	 */
+	private function getETag($node) {
+		if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
+			if (isset($_SERVER['X-CHUNKING_COMPLETE'])) {
+				return $node->getETag();
+			}
+			return null;
 		}
+		return $node->getETag();
 	}
 
 }