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<?php
/**
* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\Files\Sharing;
use OC\Files\View;
use OCP\Share\IShare;
use Sabre\DAV\Exception\MethodNotAllowed;
use Sabre\DAV\ServerPlugin;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
/**
* Make sure that the destination is writable
*/
class FilesDropPlugin extends ServerPlugin {
private ?View $view = null;
private ?IShare $share = null;
private bool $enabled = false;
public function setView(View $view): void {
$this->view = $view;
}
public function setShare(IShare $share): void {
$this->share = $share;
}
public function enable(): void {
$this->enabled = true;
}
/**
* This initializes the plugin.
* It is ONLY initialized by the server on a file drop request.
*/
public function initialize(\Sabre\DAV\Server $server): void {
$server->on('beforeMethod:*', [$this, 'beforeMethod'], 999);
$server->on('method:MKCOL', [$this, 'onMkcol']);
$this->enabled = false;
}
public function onMkcol(RequestInterface $request, ResponseInterface $response) {
if (!$this->enabled || $this->share === null || $this->view === null) {
return;
}
// If this is a folder creation request we need
// to fake a success so we can pretend every
// folder now exists.
$response->setStatus(201);
return false;
}
public function beforeMethod(RequestInterface $request, ResponseInterface $response) {
if (!$this->enabled || $this->share === null || $this->view === null) {
return;
}
// Retrieve the nickname from the request
$nickname = $request->hasHeader('X-NC-Nickname')
? trim(urldecode($request->getHeader('X-NC-Nickname')))
: null;
//
if ($request->getMethod() !== 'PUT') {
// If uploading subfolders we need to ensure they get created
// within the nickname folder
if ($request->getMethod() === 'MKCOL') {
if (!$nickname) {
throw new MethodNotAllowed('A nickname header is required when uploading subfolders');
}
} else {
throw new MethodNotAllowed('Only PUT is allowed on files drop');
}
}
// If this is a folder creation request
// let's stop there and let the onMkcol handle it
if ($request->getMethod() === 'MKCOL') {
return;
}
// Now if we create a file, we need to create the
// full path along the way. We'll only handle conflict
// resolution on file conflicts, but not on folders.
// e.g files/dCP8yn3N86EK9sL/Folder/image.jpg
$path = $request->getPath();
$token = $this->share->getToken();
// e.g files/dCP8yn3N86EK9sL
$rootPath = substr($path, 0, strpos($path, $token) + strlen($token));
// e.g /Folder/image.jpg
$relativePath = substr($path, strlen($rootPath));
$isRootUpload = substr_count($relativePath, '/') === 1;
// Extract the attributes for the file request
$isFileRequest = false;
$attributes = $this->share->getAttributes();
if ($attributes !== null) {
$isFileRequest = $attributes->getAttribute('fileRequest', 'enabled') === true;
}
// We need a valid nickname for file requests
if ($isFileRequest && !$nickname) {
throw new MethodNotAllowed('A nickname header is required for file requests');
}
// We're only allowing the upload of
// long path with subfolders if a nickname is set.
// This prevents confusion when uploading files and help
// classify them by uploaders.
if (!$nickname && !$isRootUpload) {
throw new MethodNotAllowed('A nickname header is required when uploading subfolders');
}
// If we have a nickname, let's put everything inside
if ($nickname) {
// Put all files in the subfolder
$relativePath = '/' . $nickname . '/' . $relativePath;
$relativePath = str_replace('//', '/', $relativePath);
}
// Create the folders along the way
$folders = $this->getPathSegments(dirname($relativePath));
foreach ($folders as $folder) {
if ($folder === '') {
continue;
} // skip empty parts
if (!$this->view->file_exists($folder)) {
$this->view->mkdir($folder);
}
}
// Finally handle conflicts on the end files
$noConflictPath = \OC_Helper::buildNotExistingFileNameForView(dirname($relativePath), basename($relativePath), $this->view);
$path = '/files/' . $token . '/' . $noConflictPath;
$url = $request->getBaseUrl() . str_replace('//', '/', $path);
$request->setUrl($url);
}
private function getPathSegments(string $path): array {
// Normalize slashes and remove trailing slash
$path = rtrim(str_replace('\\', '/', $path), '/');
// Handle absolute paths starting with /
$isAbsolute = str_starts_with($path, '/');
$segments = explode('/', $path);
// Add back the leading slash for the first segment if needed
$result = [];
$current = $isAbsolute ? '/' : '';
foreach ($segments as $segment) {
if ($segment === '') {
// skip empty parts
continue;
}
$current = rtrim($current, '/') . '/' . $segment;
$result[] = $current;
}
return $result;
}
}
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