/**
* 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
*
* @param string $uri
* @return void
*/
protected function httpPatch($uri)
{
// Get the node. Will throw a 404 if not found
$node = $this->server->tree->getNodeForPath($uri);
if (!$node instanceof IFile) {
throw new DAV\Exception\MethodNotAllowed('The target resource does not support the PATCH method.');
}
$range = $this->getHTTPUpdateRange();
if (!$range) {
throw new DAV\Exception\BadRequest('No valid "X-Update-Range" found in the headers');
}
$contentType = strtolower($this->server->httpRequest->getHeader('Content-Type'));
if ($contentType != 'application/x-sabredav-partialupdate') {
throw new DAV\Exception\UnsupportedMediaType('Unknown Content-Type header "' . $contentType . '"');
}
$len = $this->server->httpRequest->getHeader('Content-Length');
// Load the begin and end data
$start = $range[0] ? $range[0] : 0;
$end = $range[1] ? $range[1] : $len - 1;
// Check consistency
if ($end < $start) {
throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[1] . ') is lower than the start offset (' . $range[0] . ')');
}
if ($end - $start + 1 != $len) {
throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length (' . $len . ') is not consistent with begin (' . $range[0] . ') and end (' . $range[1] . ') offsets');
}
// Checking If-None-Match and related headers.
if (!$this->server->checkPreconditions()) {
return;
}
if (!$this->server->broadcastEvent('beforeWriteContent', array($uri, $node, null))) {
return;
}
$body = $this->server->httpRequest->getBody();
$etag = $node->putRange($body, $start - 1);
$this->server->broadcastEvent('afterWriteContent', array($uri, $node));
$this->server->httpResponse->setHeader('Content-Length', '0');
if ($etag) {
$this->server->httpResponse->setHeader('ETag', $etag);
}
$this->server->httpResponse->sendStatus(204);
return false;
}