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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Encryption;
use InvalidArgumentException;
use OC\Files\View;
use OCP\Encryption\Exceptions\GenericEncryptionException;
use OCP\Files\File as OCPFile;
use OCP\Files\Folder;
use OCP\Files\NotFoundException;
use Psr\Log\LoggerInterface;
/**
* update encrypted files, e.g. because a file was shared
*/
class Update {
public function __construct(
protected Util $util,
protected Manager $encryptionManager,
protected File $file,
protected LoggerInterface $logger,
protected string $uid,
) {
}
/**
* hook after file was shared
*/
public function postShared(OCPFile|Folder $node): void {
$this->update($node);
}
/**
* hook after file was unshared
*/
public function postUnshared(OCPFile|Folder $node): void {
$this->update($node);
}
/**
* inform encryption module that a file was restored from the trash bin,
* e.g. to update the encryption keys
*/
public function postRestore(OCPFile|Folder $node): void {
$this->update($node);
}
/**
* inform encryption module that a file was renamed,
* e.g. to update the encryption keys
*/
public function postRename(OCPFile|Folder $source, OCPFile|Folder $target): void {
if (dirname($source->getPath()) !== dirname($target->getPath())) {
$this->update($target);
}
}
/**
* get owner and path relative to data/
*
* @throws \InvalidArgumentException
*/
protected function getOwnerPath(OCPFile|Folder $node): string {
$owner = $node->getOwner()?->getUID();
if ($owner === null) {
throw new InvalidArgumentException('No owner found for ' . $node->getId());
}
$view = new View('/' . $owner . '/files');
try {
$path = $view->getPath($node->getId());
} catch (NotFoundException $e) {
throw new InvalidArgumentException('No file found for ' . $node->getId(), previous:$e);
}
return '/' . $owner . '/files/' . $path;
}
/**
* notify encryption module about added/removed users from a file/folder
*
* @param string $path relative to data/
* @throws Exceptions\ModuleDoesNotExistsException
*/
public function update(OCPFile|Folder $node): void {
$encryptionModule = $this->encryptionManager->getEncryptionModule();
// if the encryption module doesn't encrypt the files on a per-user basis
// we have nothing to do here.
if ($encryptionModule->needDetailedAccessList() === false) {
return;
}
$path = $this->getOwnerPath($node);
// if a folder was shared, get a list of all (sub-)folders
if ($node instanceof Folder) {
$allFiles = $this->util->getAllFiles($path);
} else {
$allFiles = [$path];
}
foreach ($allFiles as $file) {
$usersSharing = $this->file->getAccessList($file);
try {
$encryptionModule->update($file, $this->uid, $usersSharing);
} catch (GenericEncryptionException $e) {
// If the update of an individual file fails e.g. due to a corrupt key we should continue the operation and just log the failure
$this->logger->error('Failed to update encryption module for ' . $this->uid . ' ' . $file, [ 'exception' => $e ]);
}
}
}
}
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