nextcloud/apps/files_sharing/lib/SharedStorage.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Björn Schießle <bjoern@schiessle.org>
* @author J0WI <J0WI@users.noreply.github.com>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author scambra <sergio@entrecables.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <vincent@nextcloud.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
namespace OCA\Files_Sharing;
use OC\Files\Cache\FailedCache;
use OC\Files\Cache\NullWatcher;
use OC\Files\Filesystem;
use OC\Files\Storage\FailedStorage;
use OC\Files\Storage\Wrapper\PermissionsMask;
use OC\User\NoUserException;
use OCP\Constants;
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use OCP\Files\Cache\ICacheEntry;
use OCP\Files\NotFoundException;
use OCP\Files\Storage\IDisableEncryptionStorage;
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use OCP\Files\Storage\IStorage;
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use OCP\Lock\ILockingProvider;
use OCP\Share\IShare;
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/**
* Convert target path to source path and pass the function call to the correct storage provider
*/
class SharedStorage extends \OC\Files\Storage\Wrapper\Jail implements ISharedStorage, IDisableEncryptionStorage {
/** @var \OCP\Share\IShare */
private $superShare;
/** @var \OCP\Share\IShare[] */
private $groupedShares;
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/**
* @var \OC\Files\View
*/
private $ownerView;
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private $initialized = false;
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/**
* @var ICacheEntry
*/
private $sourceRootInfo;
/** @var string */
private $user;
/**
* @var \OCP\ILogger
*/
private $logger;
/** @var IStorage */
private $nonMaskedStorage;
private $options;
/** @var boolean */
private $sharingDisabledForUser;
public function __construct($arguments) {
$this->ownerView = $arguments['ownerView'];
$this->logger = \OC::$server->getLogger();
$this->superShare = $arguments['superShare'];
$this->groupedShares = $arguments['groupedShares'];
$this->user = $arguments['user'];
if (isset($arguments['sharingDisabledForUser'])) {
$this->sharingDisabledForUser = $arguments['sharingDisabledForUser'];
} else {
$this->sharingDisabledForUser = false;
}
parent::__construct([
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'storage' => null,
'root' => null,
]);
}
/**
* @return ICacheEntry
*/
private function getSourceRootInfo() {
if (is_null($this->sourceRootInfo)) {
if (is_null($this->superShare->getNodeCacheEntry())) {
$this->init();
$this->sourceRootInfo = $this->nonMaskedStorage->getCache()->get($this->rootPath);
} else {
$this->sourceRootInfo = $this->superShare->getNodeCacheEntry();
}
}
return $this->sourceRootInfo;
}
private function init() {
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if ($this->initialized) {
return;
}
$this->initialized = true;
try {
Filesystem::initMountPoints($this->superShare->getShareOwner());
$storageId = $this->superShare->getNodeCacheEntry() ? $this->superShare->getNodeCacheEntry()->getStorageId() : null;
$sourcePath = $this->ownerView->getPath($this->superShare->getNodeId(), $storageId);
[$this->nonMaskedStorage, $this->rootPath] = $this->ownerView->resolvePath($sourcePath);
$this->storage = new PermissionsMask([
'storage' => $this->nonMaskedStorage,
'mask' => $this->superShare->getPermissions(),
]);
} catch (NotFoundException $e) {
// original file not accessible or deleted, set FailedStorage
$this->storage = new FailedStorage(['exception' => $e]);
$this->cache = new FailedCache();
$this->rootPath = '';
} catch (NoUserException $e) {
// sharer user deleted, set FailedStorage
$this->storage = new FailedStorage(['exception' => $e]);
$this->cache = new FailedCache();
$this->rootPath = '';
} catch (\Exception $e) {
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$this->storage = new FailedStorage(['exception' => $e]);
$this->cache = new FailedCache();
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$this->rootPath = '';
$this->logger->logException($e);
}
if (!$this->nonMaskedStorage) {
$this->nonMaskedStorage = $this->storage;
}
}
/**
* @inheritdoc
*/
public function instanceOfStorage($class): bool {
if ($class === '\OC\Files\Storage\Common') {
return true;
}
if (in_array($class, ['\OC\Files\Storage\Home', '\OC\Files\ObjectStore\HomeObjectStoreStorage', '\OCP\Files\IHomeStorage'])) {
return false;
}
return parent::instanceOfStorage($class);
}
/**
* @return string
*/
public function getShareId() {
return $this->superShare->getId();
}
private function isValid(): bool {
return $this->getSourceRootInfo() && ($this->getSourceRootInfo()->getPermissions() & Constants::PERMISSION_SHARE) === Constants::PERMISSION_SHARE;
}
/**
* get id of the mount point
*
* @return string
*/
public function getId(): string {
return 'shared::' . $this->getMountPoint();
}
/**
* Get the permissions granted for a shared file
*
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* @param string $target Shared target file path
* @return int CRUDS permissions granted
*/
public function getPermissions($target = ''): int {
if (!$this->isValid()) {
return 0;
}
$permissions = parent::getPermissions($target) & $this->superShare->getPermissions();
// part files and the mount point always have delete permissions
if ($target === '' || pathinfo($target, PATHINFO_EXTENSION) === 'part') {
$permissions |= \OCP\Constants::PERMISSION_DELETE;
}
if ($this->sharingDisabledForUser) {
$permissions &= ~\OCP\Constants::PERMISSION_SHARE;
}
return $permissions;
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}
public function isCreatable($path): bool {
return (bool)($this->getPermissions($path) & \OCP\Constants::PERMISSION_CREATE);
}
public function isReadable($path): bool {
if (!$this->isValid()) {
return false;
}
if (!$this->file_exists($path)) {
return false;
}
/** @var IStorage $storage */
/** @var string $internalPath */
[$storage, $internalPath] = $this->resolvePath($path);
return $storage->isReadable($internalPath);
}
public function isUpdatable($path): bool {
return (bool)($this->getPermissions($path) & \OCP\Constants::PERMISSION_UPDATE);
}
public function isDeletable($path): bool {
return (bool)($this->getPermissions($path) & \OCP\Constants::PERMISSION_DELETE);
}
public function isSharable($path): bool {
if (\OCP\Util::isSharingDisabledForUser() || !\OC\Share\Share::isResharingAllowed()) {
return false;
}
return (bool)($this->getPermissions($path) & \OCP\Constants::PERMISSION_SHARE);
}
public function fopen($path, $mode) {
$source = $this->getUnjailedPath($path);
switch ($mode) {
case 'r+':
case 'rb+':
case 'w+':
case 'wb+':
case 'x+':
case 'xb+':
case 'a+':
case 'ab+':
case 'w':
case 'wb':
case 'x':
case 'xb':
case 'a':
case 'ab':
$creatable = $this->isCreatable(dirname($path));
$updatable = $this->isUpdatable($path);
// if neither permissions given, no need to continue
if (!$creatable && !$updatable) {
if (pathinfo($path, PATHINFO_EXTENSION) === 'part') {
$updatable = $this->isUpdatable(dirname($path));
}
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if (!$updatable) {
return false;
}
}
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$exists = $this->file_exists($path);
// if a file exists, updatable permissions are required
if ($exists && !$updatable) {
return false;
}
// part file is allowed if !$creatable but the final file is $updatable
if (pathinfo($path, PATHINFO_EXTENSION) !== 'part') {
if (!$exists && !$creatable) {
return false;
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}
}
}
$info = [
'target' => $this->getMountPoint() . '/' . $path,
'source' => $source,
'mode' => $mode,
];
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'fopen', $info);
return $this->nonMaskedStorage->fopen($this->getUnjailedPath($path), $mode);
}
/**
* see https://www.php.net/manual/en/function.rename.php
*
* @param string $path1
* @param string $path2
* @return bool
*/
public function rename($path1, $path2): bool {
$this->init();
$isPartFile = pathinfo($path1, PATHINFO_EXTENSION) === 'part';
$targetExists = $this->file_exists($path2);
$sameFolder = dirname($path1) === dirname($path2);
if ($targetExists || ($sameFolder && !$isPartFile)) {
if (!$this->isUpdatable('')) {
return false;
}
} else {
if (!$this->isCreatable('')) {
return false;
}
}
return $this->nonMaskedStorage->rename($this->getUnjailedPath($path1), $this->getUnjailedPath($path2));
}
/**
* return mount point of share, relative to data/user/files
*
* @return string
*/
public function getMountPoint(): string {
return $this->superShare->getTarget();
}
/**
* @param string $path
*/
public function setMountPoint($path): void {
$this->superShare->setTarget($path);
foreach ($this->groupedShares as $share) {
$share->setTarget($path);
}
}
/**
* get the user who shared the file
*
* @return string
*/
public function getSharedFrom(): string {
return $this->superShare->getShareOwner();
}
/**
* @return \OCP\Share\IShare
*/
public function getShare(): IShare {
return $this->superShare;
}
/**
* return share type, can be "file" or "folder"
*
* @return string
*/
public function getItemType(): string {
return $this->superShare->getNodeType();
}
/**
* @param string $path
* @param null $storage
* @return Cache
*/
public function getCache($path = '', $storage = null) {
if ($this->cache) {
return $this->cache;
}
if (!$storage) {
$storage = $this;
}
$sourceRoot = $this->getSourceRootInfo();
if ($this->storage instanceof FailedStorage) {
return new FailedCache();
}
$this->cache = new \OCA\Files_Sharing\Cache($storage, $sourceRoot, $this->superShare);
return $this->cache;
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}
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public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return new \OCA\Files_Sharing\Scanner($storage);
}
public function getOwner($path): string {
return $this->superShare->getShareOwner();
}
public function getWatcher($path = '', $storage = null): NullWatcher {
// cache updating is handled by the share source
return new NullWatcher();
}
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/**
* unshare complete storage, also the grouped shares
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*
* @return bool
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*/
public function unshareStorage(): bool {
foreach ($this->groupedShares as $share) {
\OC::$server->getShareManager()->deleteFromSelf($share, $this->user);
}
return true;
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}
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/**
* @param string $path
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
* @param \OCP\Lock\ILockingProvider $provider
* @throws \OCP\Lock\LockedException
*/
public function acquireLock($path, $type, ILockingProvider $provider) {
/** @var \OCP\Files\Storage $targetStorage */
[$targetStorage, $targetInternalPath] = $this->resolvePath($path);
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$targetStorage->acquireLock($targetInternalPath, $type, $provider);
// lock the parent folders of the owner when locking the share as recipient
if ($path === '') {
$sourcePath = $this->ownerView->getPath($this->superShare->getNodeId());
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$this->ownerView->lockFile(dirname($sourcePath), ILockingProvider::LOCK_SHARED, true);
}
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}
/**
* @param string $path
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
* @param \OCP\Lock\ILockingProvider $provider
*/
public function releaseLock($path, $type, ILockingProvider $provider) {
/** @var \OCP\Files\Storage $targetStorage */
[$targetStorage, $targetInternalPath] = $this->resolvePath($path);
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$targetStorage->releaseLock($targetInternalPath, $type, $provider);
// unlock the parent folders of the owner when unlocking the share as recipient
if ($path === '') {
$sourcePath = $this->ownerView->getPath($this->superShare->getNodeId());
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$this->ownerView->unlockFile(dirname($sourcePath), ILockingProvider::LOCK_SHARED, true);
}
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}
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/**
* @param string $path
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
* @param \OCP\Lock\ILockingProvider $provider
*/
public function changeLock($path, $type, ILockingProvider $provider) {
/** @var \OCP\Files\Storage $targetStorage */
[$targetStorage, $targetInternalPath] = $this->resolvePath($path);
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$targetStorage->changeLock($targetInternalPath, $type, $provider);
}
/**
* @return array [ available, last_checked ]
*/
public function getAvailability() {
// shares do not participate in availability logic
return [
'available' => true,
'last_checked' => 0,
];
}
/**
* @param bool $available
*/
public function setAvailability($available) {
// shares do not participate in availability logic
}
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public function getSourceStorage() {
$this->init();
return $this->nonMaskedStorage;
}
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public function getWrapperStorage() {
$this->init();
return $this->storage;
}
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public function file_get_contents($path) {
$info = [
'target' => $this->getMountPoint() . '/' . $path,
'source' => $this->getUnjailedPath($path),
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];
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_get_contents', $info);
return parent::file_get_contents($path);
}
public function file_put_contents($path, $data) {
$info = [
'target' => $this->getMountPoint() . '/' . $path,
'source' => $this->getUnjailedPath($path),
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];
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_put_contents', $info);
return parent::file_put_contents($path, $data);
}
public function setMountOptions(array $options) {
$this->mountOptions = $options;
}
public function getUnjailedPath($path) {
$this->init();
return parent::getUnjailedPath($path);
}
}