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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 OCP\Files\Folder;
use OCP\Files\NotFoundException;
use OCP\Share\IShare;
use Sabre\DAV\Exception\BadRequest;
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 ?IShare $share = null;
private bool $enabled = false;
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) {
return;
}
$node = $this->share->getNode();
if (!($node instanceof Folder)) {
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) {
return;
}
$node = $this->share->getNode();
if (!($node instanceof Folder)) {
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 (!$nickname) {
throw new BadRequest('A nickname header is required when uploading subfolders');
}
} else {
throw new MethodNotAllowed('Only PUT is allowed on files drop');
}
}
// If this is a folder creation request
// let's stop there and let the onMkcol handle it
if ($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 && !$nickname) {
throw new BadRequest('A nickname header is required for file requests');
}
// We're only allowing the upload of
// long path with subfolders if a nickname is set.
// This prevents confusion when uploading files and help
// classify them by uploaders.
if (!$nickname && !$isRootUpload) {
throw new BadRequest('A nickname header is required when uploading subfolders');
}
if ($nickname) {
try {
$node->verifyPath($nickname);
} catch (\Exception $e) {
// If the path is not valid, we throw an exception
throw new BadRequest('Invalid nickname: ' . $nickname);
}
// Forbid nicknames starting with a dot
if (str_starts_with($nickname, '.')) {
throw new BadRequest('Invalid nickname: ' . $nickname);
}
// If we have a nickname, let's put
// all files in the subfolder
$relativePath = '/' . $nickname . '/' . $relativePath;
$relativePath = str_replace('//', '/', $relativePath);
}
// Create the folders along the way
$folder = $node;
$pathSegments = $this->getPathSegments(dirname($relativePath));
foreach ($pathSegments as $pathSegment) {
if ($pathSegment === '') {
continue;
}
try {
// get the current folder
$currentFolder = $folder->get($pathSegment);
// check target is a folder
if ($currentFolder instanceof Folder) {
$folder = $currentFolder;
} else {
// otherwise look in the parent folder if we already create an unique folder name
foreach ($folder->getDirectoryListing() as $child) {
// we look for folders which match "NAME (SUFFIX)"
if ($child instanceof Folder && str_starts_with($child->getName(), $pathSegment)) {
$suffix = substr($child->getName(), strlen($pathSegment));
if (preg_match('/^ \(\d+\)$/', $suffix)) {
// we found the unique folder name and can use it
$folder = $child;
break;
}
}
}
// no folder found so we need to create a new unique folder name
if (!isset($child) || $child !== $folder) {
$folder = $folder->newFolder($folder->getNonExistingName($pathSegment));
}
}
} catch (NotFoundException) {
// the folder does simply not exist so we create it
$folder = $folder->newFolder($pathSegment);
}
}
// Finally handle conflicts on the end files
$uniqueName = $folder->getNonExistingName(basename($relativePath));
$relativePath = substr($folder->getPath(), strlen($node->getPath()));
$path = '/files/' . $token . '/' . $relativePath . '/' . $uniqueName;
$url = rtrim($request->getBaseUrl(), '/') . str_replace('//', '/', $path);
$request->setUrl($url);
}
private function getPathSegments(string $path): array {
// Normalize slashes and remove trailing slash
$path = trim(str_replace('\\', '/', $path), '/');
return explode('/', $path);
}
}
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