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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Files\Storage\Wrapper;
use OC\Files\Cache\Wrapper\CachePermissionsMask;
use OCP\Constants;
/**
* Mask the permissions of a storage
*
* This can be used to restrict update, create, delete and/or share permissions of a storage
*
* Note that the read permissions can't be masked
*/
class PermissionsMask extends Wrapper {
/**
* @var int the permissions bits we want to keep
*/
private $mask;
/**
* @param array $arguments ['storage' => $storage, 'mask' => $mask]
*
* $storage: The storage the permissions mask should be applied on
* $mask: The permission bits that should be kept, a combination of the \OCP\Constant::PERMISSION_ constants
*/
public function __construct($arguments) {
parent::__construct($arguments);
$this->mask = $arguments['mask'];
}
private function checkMask($permissions) {
return ($this->mask & $permissions) === $permissions;
}
public function isUpdatable($path) {
return $this->checkMask(Constants::PERMISSION_UPDATE) and parent::isUpdatable($path);
}
public function isCreatable($path) {
return $this->checkMask(Constants::PERMISSION_CREATE) and parent::isCreatable($path);
}
public function isDeletable($path) {
return $this->checkMask(Constants::PERMISSION_DELETE) and parent::isDeletable($path);
}
public function isSharable($path) {
return $this->checkMask(Constants::PERMISSION_SHARE) and parent::isSharable($path);
}
public function getPermissions($path) {
return $this->storage->getPermissions($path) & $this->mask;
}
public function rename($source, $target) {
//This is a rename of the transfer file to the original file
if (dirname($source) === dirname($target) && strpos($source, '.ocTransferId') > 0) {
return $this->checkMask(Constants::PERMISSION_CREATE) and parent::rename($source, $target);
}
return $this->checkMask(Constants::PERMISSION_UPDATE) and parent::rename($source, $target);
}
public function copy($source, $target) {
return $this->checkMask(Constants::PERMISSION_CREATE) and parent::copy($source, $target);
}
public function touch($path, $mtime = null) {
$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
return $this->checkMask($permissions) and parent::touch($path, $mtime);
}
public function mkdir($path) {
return $this->checkMask(Constants::PERMISSION_CREATE) and parent::mkdir($path);
}
public function rmdir($path) {
return $this->checkMask(Constants::PERMISSION_DELETE) and parent::rmdir($path);
}
public function unlink($path) {
return $this->checkMask(Constants::PERMISSION_DELETE) and parent::unlink($path);
}
public function file_put_contents($path, $data) {
$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
return $this->checkMask($permissions) ? parent::file_put_contents($path, $data) : false;
}
public function fopen($path, $mode) {
if ($mode === 'r' or $mode === 'rb') {
return parent::fopen($path, $mode);
} else {
$permissions = $this->file_exists($path) ? Constants::PERMISSION_UPDATE : Constants::PERMISSION_CREATE;
return $this->checkMask($permissions) ? parent::fopen($path, $mode) : false;
}
}
/**
* get a cache instance for the storage
*
* @param string $path
* @param \OC\Files\Storage\Storage (optional) the storage to pass to the cache
* @return \OC\Files\Cache\Cache
*/
public function getCache($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
$sourceCache = parent::getCache($path, $storage);
return new CachePermissionsMask($sourceCache, $this->mask);
}
public function getMetaData($path) {
$data = parent::getMetaData($path);
if ($data && isset($data['permissions'])) {
$data['scan_permissions'] = $data['scan_permissions'] ?? $data['permissions'];
$data['permissions'] &= $this->mask;
}
return $data;
}
public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this->storage;
}
return parent::getScanner($path, $storage);
}
public function getDirectoryContent($directory): \Traversable {
foreach ($this->getWrapperStorage()->getDirectoryContent($directory) as $data) {
$data['scan_permissions'] = $data['scan_permissions'] ?? $data['permissions'];
$data['permissions'] &= $this->mask;
yield $data;
}
}
}
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