adding OC-ETag header

lib/private/connector/sabre/file.php

@@ -180,21 +180,6 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements \Sabre\
 		return $this->info->getSize();
 	}
 
-	/**
-	 * Returns the ETag for a file
-	 *
-	 * An ETag is a unique identifier representing the current version of the
-	 * file. If the file changes, the ETag MUST change.  The ETag is an
-	 * arbitrary string, but MUST be surrounded by double-quotes.
-	 *
-	 * Return null if the ETag can not effectively be determined
-	 *
-	 * @return mixed
-	 */
-	public function getETag() {
-		return '"' . $this->info->getEtag() . '"';
-	}
-
 	/**
 	 * Returns the mime-type for a file
 	 *

lib/private/connector/sabre/filesplugin.php

@@ -107,6 +107,10 @@ class OC_Connector_Sabre_FilesPlugin extends \Sabre\DAV\ServerPlugin
 			if (!is_null($fileId)) {
 				$this->server->httpResponse->setHeader('OC-FileId', $fileId);
 			}
+			$eTag = $node->getETag();
+			if (!is_null($eTag)) {
+				$this->server->httpResponse->setHeader('OC-ETag', $eTag);
+			}
 		}
 	}
 

lib/private/connector/sabre/node.php

@@ -270,4 +270,20 @@ abstract class OC_Connector_Sabre_Node implements \Sabre\DAV\INode, \Sabre\DAV\I
 		}
 		return $p;
 	}
+
+	/**
+	 * Returns the ETag for a file
+	 *
+	 * An ETag is a unique identifier representing the current version of the
+	 * file. If the file changes, the ETag MUST change.  The ETag is an
+	 * arbitrary string, but MUST be surrounded by double-quotes.
+	 *
+	 * Return null if the ETag can not effectively be determined
+	 *
+	 * @return mixed
+	 */
+	public function getETag() {
+		return '"' . $this->info->getEtag() . '"';
+	}
+
 }