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<?php
declare(strict_types=1);
namespace Sabre\DAV\PartialUpdate;
use Sabre\DAV;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
/**
* Partial update plugin (Patch method).
*
* This plugin provides a way to modify only part of a target resource
* It may bu used to update a file chunk, upload big a file into smaller
* chunks or resume an upload.
*
* $patchPlugin = new \Sabre\DAV\PartialUpdate\Plugin();
* $server->addPlugin($patchPlugin);
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
* @license http://sabre.io/license/ Modified BSD License
*/
class Plugin extends DAV\ServerPlugin
{
const RANGE_APPEND = 1;
const RANGE_START = 2;
const RANGE_END = 3;
/**
* Reference to server.
*
* @var DAV\Server
*/
protected $server;
/**
* Initializes the plugin.
*
* This method is automatically called by the Server class after addPlugin.
*/
public function initialize(DAV\Server $server)
{
$this->server = $server;
$server->on('method:PATCH', [$this, 'httpPatch']);
}
/**
* Returns a plugin name.
*
* Using this name other plugins will be able to access other plugins
* using DAV\Server::getPlugin
*
* @return string
*/
public function getPluginName()
{
return 'partialupdate';
}
/**
* Use this method to tell the server this plugin defines additional
* HTTP methods.
*
* This method is passed a uri. It should only return HTTP methods that are
* available for the specified uri.
*
* We claim to support PATCH method (partirl update) if and only if
* - the node exist
* - the node implements our partial update interface
*
* @param string $uri
*
* @return array
*/
public function getHTTPMethods($uri)
{
$tree = $this->server->tree;
if ($tree->nodeExists($uri)) {
$node = $tree->getNodeForPath($uri);
if ($node instanceof IPatchSupport) {
return ['PATCH'];
}
}
return [];
}
/**
* Returns a list of features for the HTTP OPTIONS Dav: header.
*
* @return array
*/
public function getFeatures()
{
return ['sabredav-partialupdate'];
}
/**
* Patch an uri.
*
* The WebDAV patch request can be used to modify only a part of an
* existing resource. If the resource does not exist yet and the first
* offset is not 0, the request fails
*/
public function httpPatch(RequestInterface $request, ResponseInterface $response)
{
$path = $request->getPath();
// Get the node. Will throw a 404 if not found
$node = $this->server->tree->getNodeForPath($path);
if (!$node instanceof IPatchSupport) {
throw new DAV\Exception\MethodNotAllowed('The target resource does not support the PATCH method.');
}
$range = $this->getHTTPUpdateRange($request);
if (!$range) {
throw new DAV\Exception\BadRequest('No valid "X-Update-Range" found in the headers');
}
$contentType = strtolower(
(string) $request->getHeader('Content-Type')
);
if ('application/x-sabredav-partialupdate' != $contentType) {
throw new DAV\Exception\UnsupportedMediaType('Unknown Content-Type header "'.$contentType.'"');
}
$len = $this->server->httpRequest->getHeader('Content-Length');
if (!$len) {
throw new DAV\Exception\LengthRequired('A Content-Length header is required');
}
switch ($range[0]) {
case self::RANGE_START:
// Calculate the end-range if it doesn't exist.
if (!$range[2]) {
$range[2] = $range[1] + $len - 1;
} else {
if ($range[2] < $range[1]) {
throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset ('.$range[2].') is lower than the start offset ('.$range[1].')');
}
if ($range[2] - $range[1] + 1 != $len) {
throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length ('.$len.') is not consistent with begin ('.$range[1].') and end ('.$range[2].') offsets');
}
}
break;
}
if (!$this->server->emit('beforeWriteContent', [$path, $node, null])) {
return;
}
$body = $this->server->httpRequest->getBody();
$etag = $node->patch($body, $range[0], isset($range[1]) ? $range[1] : null);
$this->server->emit('afterWriteContent', [$path, $node]);
$response->setHeader('Content-Length', '0');
if ($etag) {
$response->setHeader('ETag', $etag);
}
$response->setStatus(204);
// Breaks the event chain
return false;
}
/**
* Returns the HTTP custom range update header.
*
* This method returns null if there is no well-formed HTTP range request
* header. It returns array(1) if it was an append request, array(2,
* $start, $end) if it's a start and end range, lastly it's array(3,
* $endoffset) if the offset was negative, and should be calculated from
* the end of the file.
*
* Examples:
*
* null - invalid
* [1] - append
* [2,10,15] - update bytes 10, 11, 12, 13, 14, 15
* [2,10,null] - update bytes 10 until the end of the patch body
* [3,-5] - update from 5 bytes from the end of the file.
*
* @return array|null
*/
public function getHTTPUpdateRange(RequestInterface $request)
{
$range = $request->getHeader('X-Update-Range');
if (is_null($range)) {
return null;
}
// Matching "Range: bytes=1234-5678: both numbers are optional
if (!preg_match('/^(append)|(?:bytes=([0-9]+)-([0-9]*))|(?:bytes=(-[0-9]+))$/i', $range, $matches)) {
return null;
}
if ('append' === $matches[1]) {
return [self::RANGE_APPEND];
} elseif (strlen($matches[2]) > 0) {
return [self::RANGE_START, (int) $matches[2], (int) $matches[3] ?: null];
} else {
return [self::RANGE_END, (int) $matches[4]];
}
}
}
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