server/files/ajax/rename.php

<?php

// Init owncloud
require_once('../../lib/base.php');

// We send json data
header( "Content-Type: application/jsonrequest" );

// Check if we are a user
if( !OC_User::isLoggedIn()){
	echo json_encode( array( "status" => "error", "data" => array( "message" => "Authentication error" )));
	exit();
}

// Get data
$dir = $_GET["dir"];
$file = $_GET["file"];
$newname = $_GET["newname"];

// Delete
if( OC_Files::move( $dir, $file, $dir, $newname )) {
	echo json_encode( array( "status" => "success", "data" => array( "dir" => $dir, "file" => $file, "newname" => $newname )));
}
else{
	echo json_encode( array( "status" => "error", "data" => array( "message" => "Unable to rename file" )));
}

?>