adding new webdav property containing the folder size

lib/private/connector/sabre/directory.php

@@ -230,4 +230,13 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node
 		return $props;
 	}
 
+	/**
+	 * Returns the size of the node, in bytes
+	 *
+	 * @return int
+	 */
+	public function getSize() {
+		return $this->info->getSize();
+	}
+
 }

lib/private/connector/sabre/filesplugin.php

@@ -38,6 +38,7 @@ class OC_Connector_Sabre_FilesPlugin extends \Sabre\DAV\ServerPlugin
 		$server->xmlNamespaces[self::NS_OWNCLOUD] = 'oc';
 		$server->protectedProperties[] = '{' . self::NS_OWNCLOUD . '}id';
 		$server->protectedProperties[] = '{' . self::NS_OWNCLOUD . '}permissions';
+		$server->protectedProperties[] = '{' . self::NS_OWNCLOUD . '}size';
 
 		$this->server = $server;
 		$this->server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
@@ -74,12 +75,17 @@ class OC_Connector_Sabre_FilesPlugin extends \Sabre\DAV\ServerPlugin
 			}
 
 			$permissions = $node->getDavPermissions();
-			if (!is_null($fileId)) {
+			if (!is_null($permissions)) {
 				$returnedProperties[200][$permissionsPropertyName] = $permissions;
 			}
-
 		}
 
+		if ($node instanceof OC_Connector_Sabre_Directory) {
+			$sizePropertyName = '{' . self::NS_OWNCLOUD . '}size';
+
+			/** @var $node OC_Connector_Sabre_Directory */
+			$returnedProperties[200][$sizePropertyName] = $node->getSize();
+		}
 	}
 
 	/**