nextcloud / server

lib/private/Files/Node/Root.php

Indentation +480 added lines, -480 removed lines

@@ -51,484 +51,484 @@
  * @package OC\Files\Node
  */
 class Root extends Folder implements IRootFolder {
-	private Manager $mountManager;
-	private PublicEmitter $emitter;
-	private ?IUser $user;
-	private CappedMemoryCache $userFolderCache;
-	private IUserMountCache $userMountCache;
-	private LoggerInterface $logger;
-	private IUserManager $userManager;
-	private IEventDispatcher $eventDispatcher;
-	private ICache $pathByIdCache;
-
-	/**
-	 * @param Manager $manager
-	 * @param View $view
-	 * @param IUser|null $user
-	 */
-	public function __construct(
-		$manager,
-		$view,
-		$user,
-		IUserMountCache $userMountCache,
-		LoggerInterface $logger,
-		IUserManager $userManager,
-		IEventDispatcher $eventDispatcher,
-		ICacheFactory $cacheFactory,
-	) {
-		parent::__construct($this, $view, '');
-		$this->mountManager = $manager;
-		$this->user = $user;
-		$this->emitter = new PublicEmitter();
-		$this->userFolderCache = new CappedMemoryCache();
-		$this->userMountCache = $userMountCache;
-		$this->logger = $logger;
-		$this->userManager = $userManager;
-		$eventDispatcher->addListener(FilesystemTornDownEvent::class, function () {
-			$this->userFolderCache = new CappedMemoryCache();
-		});
-		$this->pathByIdCache = $cacheFactory->createLocal('path-by-id');
-	}
-
-	/**
-	 * Get the user for which the filesystem is setup
-	 *
-	 * @return \OC\User\User
-	 */
-	public function getUser() {
-		return $this->user;
-	}
-
-	/**
-	 * @param string $scope
-	 * @param string $method
-	 * @param callable $callback
-	 */
-	public function listen($scope, $method, callable $callback) {
-		$this->emitter->listen($scope, $method, $callback);
-	}
-
-	/**
-	 * @param string $scope optional
-	 * @param string $method optional
-	 * @param callable $callback optional
-	 */
-	public function removeListener($scope = null, $method = null, ?callable $callback = null) {
-		$this->emitter->removeListener($scope, $method, $callback);
-	}
-
-	/**
-	 * @param string $scope
-	 * @param string $method
-	 * @param Node[] $arguments
-	 */
-	public function emit($scope, $method, $arguments = []) {
-		$this->emitter->emit($scope, $method, $arguments);
-	}
-
-	/**
-	 * @param \OC\Files\Storage\Storage $storage
-	 * @param string $mountPoint
-	 * @param array $arguments
-	 */
-	public function mount($storage, $mountPoint, $arguments = []) {
-		$mount = new MountPoint($storage, $mountPoint, $arguments);
-		$this->mountManager->addMount($mount);
-	}
-
-	public function getMount(string $mountPoint): IMountPoint {
-		return $this->mountManager->find($mountPoint);
-	}
-
-	/**
-	 * @param string $mountPoint
-	 * @return \OC\Files\Mount\MountPoint[]
-	 */
-	public function getMountsIn(string $mountPoint): array {
-		return $this->mountManager->findIn($mountPoint);
-	}
-
-	/**
-	 * @param string $storageId
-	 * @return \OC\Files\Mount\MountPoint[]
-	 */
-	public function getMountByStorageId($storageId) {
-		return $this->mountManager->findByStorageId($storageId);
-	}
-
-	/**
-	 * @param int $numericId
-	 * @return MountPoint[]
-	 */
-	public function getMountByNumericStorageId($numericId) {
-		return $this->mountManager->findByNumericId($numericId);
-	}
-
-	/**
-	 * @param \OC\Files\Mount\MountPoint $mount
-	 */
-	public function unMount($mount) {
-		$this->mountManager->remove($mount);
-	}
-
-	public function get($path) {
-		$path = $this->normalizePath($path);
-		if ($this->isValidPath($path)) {
-			$fullPath = $this->getFullPath($path);
-			$fileInfo = $this->view->getFileInfo($fullPath, false);
-			if ($fileInfo) {
-				return $this->createNode($fullPath, $fileInfo, false);
-			} else {
-				throw new NotFoundException($path);
-			}
-		} else {
-			throw new NotPermittedException();
-		}
-	}
-
-	//most operations can't be done on the root
-
-	/**
-	 * @param string $targetPath
-	 * @return Node
-	 * @throws \OCP\Files\NotPermittedException
-	 */
-	public function rename($targetPath) {
-		throw new NotPermittedException();
-	}
-
-	public function delete() {
-		throw new NotPermittedException();
-	}
-
-	/**
-	 * @param string $targetPath
-	 * @return Node
-	 * @throws \OCP\Files\NotPermittedException
-	 */
-	public function copy($targetPath) {
-		throw new NotPermittedException();
-	}
-
-	/**
-	 * @param int $mtime
-	 * @throws \OCP\Files\NotPermittedException
-	 */
-	public function touch($mtime = null) {
-		throw new NotPermittedException();
-	}
-
-	/**
-	 * @return \OC\Files\Storage\Storage
-	 * @throws \OCP\Files\NotFoundException
-	 */
-	public function getStorage() {
-		throw new NotFoundException();
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getPath() {
-		return '/';
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getInternalPath() {
-		return '';
-	}
-
-	/**
-	 * @return int
-	 */
-	public function getId() {
-		return 0;
-	}
-
-	/**
-	 * @return array
-	 */
-	public function stat() {
-		return [];
-	}
-
-	/**
-	 * @return int
-	 */
-	public function getMTime() {
-		return 0;
-	}
-
-	/**
-	 * @param bool $includeMounts
-	 * @return int|float
-	 */
-	public function getSize($includeMounts = true): int|float {
-		return 0;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getEtag() {
-		return '';
-	}
-
-	/**
-	 * @return int
-	 */
-	public function getPermissions() {
-		return \OCP\Constants::PERMISSION_CREATE;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isReadable() {
-		return false;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isUpdateable() {
-		return false;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isDeletable() {
-		return false;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isShareable() {
-		return false;
-	}
-
-	/**
-	 * @throws \OCP\Files\NotFoundException
-	 */
-	public function getParent(): INode|IRootFolder {
-		throw new NotFoundException();
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getName() {
-		return '';
-	}
-
-	/**
-	 * Returns a view to user's files folder
-	 *
-	 * @param string $userId user ID
-	 * @return \OCP\Files\Folder
-	 * @throws NoUserException
-	 * @throws NotPermittedException
-	 */
-	public function getUserFolder($userId) {
-		$userObject = $this->userManager->get($userId);
-
-		if (is_null($userObject)) {
-			$e = new NoUserException('Backends provided no user object');
-			$this->logger->error(
-				sprintf(
-					'Backends provided no user object for %s',
-					$userId
-				),
-				[
-					'app' => 'files',
-					'exception' => $e,
-				]
-			);
-			throw $e;
-		}
-
-		$userId = $userObject->getUID();
-
-		if (!$this->userFolderCache->hasKey($userId)) {
-			if ($this->mountManager->getSetupManager()->isSetupComplete($userObject)) {
-				try {
-					$folder = $this->get('/' . $userId . '/files');
-					if (!$folder instanceof \OCP\Files\Folder) {
-						throw new \Exception("Account folder for \"$userId\" exists as a file");
-					}
-				} catch (NotFoundException $e) {
-					if (!$this->nodeExists('/' . $userId)) {
-						$this->newFolder('/' . $userId);
-					}
-					$folder = $this->newFolder('/' . $userId . '/files');
-				}
-			} else {
-				$folder = new LazyUserFolder($this, $userObject, $this->mountManager);
-			}
-
-			$this->userFolderCache->set($userId, $folder);
-		}
-
-		return $this->userFolderCache->get($userId);
-	}
-
-	public function getUserMountCache() {
-		return $this->userMountCache;
-	}
-
-	public function getFirstNodeByIdInPath(int $id, string $path): ?INode {
-		// scope the cache by user, so we don't return nodes for different users
-		if ($this->user) {
-			$cachedPath = $this->pathByIdCache->get($this->user->getUID() . '::' . $id);
-			if ($cachedPath && str_starts_with($cachedPath, $path)) {
-				// getting the node by path is significantly cheaper than finding it by id
-				try {
-					$node = $this->get($cachedPath);
-					// by validating that the cached path still has the requested fileid we can work around the need to invalidate the cached path
-					// if the cached path is invalid or a different file now we fall back to the uncached logic
-					if ($node && $node->getId() === $id) {
-						return $node;
-					}
-				} catch (NotFoundException|NotPermittedException) {
-					// The file may be moved but the old path still in cache
-				}
-			}
-		}
-		$node = current($this->getByIdInPath($id, $path));
-		if (!$node) {
-			return null;
-		}
-
-		if ($this->user) {
-			$this->pathByIdCache->set($this->user->getUID() . '::' . $id, $node->getPath());
-		}
-		return $node;
-	}
-
-	/**
-	 * @param int $id
-	 * @return Node[]
-	 */
-	public function getByIdInPath(int $id, string $path): array {
-		$mountCache = $this->getUserMountCache();
-		if (strpos($path, '/', 1) > 0) {
-			[, $user] = explode('/', $path);
-		} else {
-			$user = null;
-		}
-		$mountsContainingFile = $mountCache->getMountsForFileId($id, $user);
-
-		// if the mount isn't in the cache yet, perform a setup first, then try again
-		if (count($mountsContainingFile) === 0) {
-			$this->mountManager->getSetupManager()->setupForPath($path, true);
-			$mountsContainingFile = $mountCache->getMountsForFileId($id, $user);
-		}
-
-		// when a user has access through the same storage through multiple paths
-		// (such as an external storage that is both mounted for a user and shared to the user)
-		// the mount cache will only hold a single entry for the storage
-		// this can lead to issues as the different ways the user has access to a storage can have different permissions
-		//
-		// so instead of using the cached entries directly, we instead filter the current mounts by the rootid of the cache entry
-
-		$mountRootIds = array_map(function ($mount) {
-			return $mount->getRootId();
-		}, $mountsContainingFile);
-		$mountRootPaths = array_map(function ($mount) {
-			return $mount->getRootInternalPath();
-		}, $mountsContainingFile);
-		$mountProviders = array_unique(array_map(function ($mount) {
-			return $mount->getMountProvider();
-		}, $mountsContainingFile));
-		$mountRoots = array_combine($mountRootIds, $mountRootPaths);
-
-		$mounts = $this->mountManager->getMountsByMountProvider($path, $mountProviders);
-
-		$mountsContainingFile = array_filter($mounts, function ($mount) use ($mountRoots) {
-			return isset($mountRoots[$mount->getStorageRootId()]);
-		});
-
-		if (count($mountsContainingFile) === 0) {
-			if ($user === $this->getAppDataDirectoryName()) {
-				$folder = $this->get($path);
-				if ($folder instanceof Folder) {
-					return $folder->getByIdInRootMount($id);
-				} else {
-					throw new \Exception('getByIdInPath with non folder');
-				}
-			}
-			return [];
-		}
-
-		$nodes = array_map(function (IMountPoint $mount) use ($id, $mountRoots) {
-			$rootInternalPath = $mountRoots[$mount->getStorageRootId()];
-			$cacheEntry = $mount->getStorage()->getCache()->get($id);
-			if (!$cacheEntry) {
-				return null;
-			}
-
-			// cache jails will hide the "true" internal path
-			$internalPath = ltrim($rootInternalPath . '/' . $cacheEntry->getPath(), '/');
-			$pathRelativeToMount = substr($internalPath, strlen($rootInternalPath));
-			$pathRelativeToMount = ltrim($pathRelativeToMount, '/');
-			$absolutePath = rtrim($mount->getMountPoint() . $pathRelativeToMount, '/');
-			$storage = $mount->getStorage();
-			if ($storage === null) {
-				return null;
-			}
-			$ownerId = $storage->getOwner($pathRelativeToMount);
-			if ($ownerId !== false) {
-				$owner = Server::get(IUserManager::class)->get($ownerId);
-			} else {
-				$owner = null;
-			}
-			return $this->createNode($absolutePath, new FileInfo(
-				$absolutePath,
-				$storage,
-				$cacheEntry->getPath(),
-				$cacheEntry,
-				$mount,
-				$owner,
-			));
-		}, $mountsContainingFile);
-
-		$nodes = array_filter($nodes);
-
-		$folders = array_filter($nodes, function (Node $node) use ($path) {
-			return PathHelper::getRelativePath($path, $node->getPath()) !== null;
-		});
-		usort($folders, function ($a, $b) {
-			return $b->getPath() <=> $a->getPath();
-		});
-		return $folders;
-	}
-
-	public function getNodeFromCacheEntryAndMount(ICacheEntry $cacheEntry, IMountPoint $mountPoint): INode {
-		$path = $cacheEntry->getPath();
-		$fullPath = $mountPoint->getMountPoint() . $path;
-		// todo: LazyNode?
-		$info = new FileInfo($fullPath, $mountPoint->getStorage(), $path, $cacheEntry, $mountPoint);
-		$parentPath = dirname($fullPath);
-		$parent = new LazyFolder($this, function () use ($parentPath) {
-			$parent = $this->get($parentPath);
-			if ($parent instanceof \OCP\Files\Folder) {
-				return $parent;
-			} else {
-				throw new \Exception("parent $parentPath is not a folder");
-			}
-		}, [
-			'path' => $parentPath,
-		]);
-		$isDir = $info->getType() === FileInfo::TYPE_FOLDER;
-		$view = new View('');
-		if ($isDir) {
-			return new Folder($this, $view, $fullPath, $info, $parent);
-		} else {
-			return new File($this, $view, $fullPath, $info, $parent);
-		}
-	}
+    private Manager $mountManager;
+    private PublicEmitter $emitter;
+    private ?IUser $user;
+    private CappedMemoryCache $userFolderCache;
+    private IUserMountCache $userMountCache;
+    private LoggerInterface $logger;
+    private IUserManager $userManager;
+    private IEventDispatcher $eventDispatcher;
+    private ICache $pathByIdCache;
+
+    /**
+     * @param Manager $manager
+     * @param View $view
+     * @param IUser|null $user
+     */
+    public function __construct(
+        $manager,
+        $view,
+        $user,
+        IUserMountCache $userMountCache,
+        LoggerInterface $logger,
+        IUserManager $userManager,
+        IEventDispatcher $eventDispatcher,
+        ICacheFactory $cacheFactory,
+    ) {
+        parent::__construct($this, $view, '');
+        $this->mountManager = $manager;
+        $this->user = $user;
+        $this->emitter = new PublicEmitter();
+        $this->userFolderCache = new CappedMemoryCache();
+        $this->userMountCache = $userMountCache;
+        $this->logger = $logger;
+        $this->userManager = $userManager;
+        $eventDispatcher->addListener(FilesystemTornDownEvent::class, function () {
+            $this->userFolderCache = new CappedMemoryCache();
+        });
+        $this->pathByIdCache = $cacheFactory->createLocal('path-by-id');
+    }
+
+    /**
+     * Get the user for which the filesystem is setup
+     *
+     * @return \OC\User\User
+     */
+    public function getUser() {
+        return $this->user;
+    }
+
+    /**
+     * @param string $scope
+     * @param string $method
+     * @param callable $callback
+     */
+    public function listen($scope, $method, callable $callback) {
+        $this->emitter->listen($scope, $method, $callback);
+    }
+
+    /**
+     * @param string $scope optional
+     * @param string $method optional
+     * @param callable $callback optional
+     */
+    public function removeListener($scope = null, $method = null, ?callable $callback = null) {
+        $this->emitter->removeListener($scope, $method, $callback);
+    }
+
+    /**
+     * @param string $scope
+     * @param string $method
+     * @param Node[] $arguments
+     */
+    public function emit($scope, $method, $arguments = []) {
+        $this->emitter->emit($scope, $method, $arguments);
+    }
+
+    /**
+     * @param \OC\Files\Storage\Storage $storage
+     * @param string $mountPoint
+     * @param array $arguments
+     */
+    public function mount($storage, $mountPoint, $arguments = []) {
+        $mount = new MountPoint($storage, $mountPoint, $arguments);
+        $this->mountManager->addMount($mount);
+    }
+
+    public function getMount(string $mountPoint): IMountPoint {
+        return $this->mountManager->find($mountPoint);
+    }
+
+    /**
+     * @param string $mountPoint
+     * @return \OC\Files\Mount\MountPoint[]
+     */
+    public function getMountsIn(string $mountPoint): array {
+        return $this->mountManager->findIn($mountPoint);
+    }
+
+    /**
+     * @param string $storageId
+     * @return \OC\Files\Mount\MountPoint[]
+     */
+    public function getMountByStorageId($storageId) {
+        return $this->mountManager->findByStorageId($storageId);
+    }
+
+    /**
+     * @param int $numericId
+     * @return MountPoint[]
+     */
+    public function getMountByNumericStorageId($numericId) {
+        return $this->mountManager->findByNumericId($numericId);
+    }
+
+    /**
+     * @param \OC\Files\Mount\MountPoint $mount
+     */
+    public function unMount($mount) {
+        $this->mountManager->remove($mount);
+    }
+
+    public function get($path) {
+        $path = $this->normalizePath($path);
+        if ($this->isValidPath($path)) {
+            $fullPath = $this->getFullPath($path);
+            $fileInfo = $this->view->getFileInfo($fullPath, false);
+            if ($fileInfo) {
+                return $this->createNode($fullPath, $fileInfo, false);
+            } else {
+                throw new NotFoundException($path);
+            }
+        } else {
+            throw new NotPermittedException();
+        }
+    }
+
+    //most operations can't be done on the root
+
+    /**
+     * @param string $targetPath
+     * @return Node
+     * @throws \OCP\Files\NotPermittedException
+     */
+    public function rename($targetPath) {
+        throw new NotPermittedException();
+    }
+
+    public function delete() {
+        throw new NotPermittedException();
+    }
+
+    /**
+     * @param string $targetPath
+     * @return Node
+     * @throws \OCP\Files\NotPermittedException
+     */
+    public function copy($targetPath) {
+        throw new NotPermittedException();
+    }
+
+    /**
+     * @param int $mtime
+     * @throws \OCP\Files\NotPermittedException
+     */
+    public function touch($mtime = null) {
+        throw new NotPermittedException();
+    }
+
+    /**
+     * @return \OC\Files\Storage\Storage
+     * @throws \OCP\Files\NotFoundException
+     */
+    public function getStorage() {
+        throw new NotFoundException();
+    }
+
+    /**
+     * @return string
+     */
+    public function getPath() {
+        return '/';
+    }
+
+    /**
+     * @return string
+     */
+    public function getInternalPath() {
+        return '';
+    }
+
+    /**
+     * @return int
+     */
+    public function getId() {
+        return 0;
+    }
+
+    /**
+     * @return array
+     */
+    public function stat() {
+        return [];
+    }
+
+    /**
+     * @return int
+     */
+    public function getMTime() {
+        return 0;
+    }
+
+    /**
+     * @param bool $includeMounts
+     * @return int|float
+     */
+    public function getSize($includeMounts = true): int|float {
+        return 0;
+    }
+
+    /**
+     * @return string
+     */
+    public function getEtag() {
+        return '';
+    }
+
+    /**
+     * @return int
+     */
+    public function getPermissions() {
+        return \OCP\Constants::PERMISSION_CREATE;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isReadable() {
+        return false;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isUpdateable() {
+        return false;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isDeletable() {
+        return false;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isShareable() {
+        return false;
+    }
+
+    /**
+     * @throws \OCP\Files\NotFoundException
+     */
+    public function getParent(): INode|IRootFolder {
+        throw new NotFoundException();
+    }
+
+    /**
+     * @return string
+     */
+    public function getName() {
+        return '';
+    }
+
+    /**
+     * Returns a view to user's files folder
+     *
+     * @param string $userId user ID
+     * @return \OCP\Files\Folder
+     * @throws NoUserException
+     * @throws NotPermittedException
+     */
+    public function getUserFolder($userId) {
+        $userObject = $this->userManager->get($userId);
+
+        if (is_null($userObject)) {
+            $e = new NoUserException('Backends provided no user object');
+            $this->logger->error(
+                sprintf(
+                    'Backends provided no user object for %s',
+                    $userId
+                ),
+                [
+                    'app' => 'files',
+                    'exception' => $e,
+                ]
+            );
+            throw $e;
+        }
+
+        $userId = $userObject->getUID();
+
+        if (!$this->userFolderCache->hasKey($userId)) {
+            if ($this->mountManager->getSetupManager()->isSetupComplete($userObject)) {
+                try {
+                    $folder = $this->get('/' . $userId . '/files');
+                    if (!$folder instanceof \OCP\Files\Folder) {
+                        throw new \Exception("Account folder for \"$userId\" exists as a file");
+                    }
+                } catch (NotFoundException $e) {
+                    if (!$this->nodeExists('/' . $userId)) {
+                        $this->newFolder('/' . $userId);
+                    }
+                    $folder = $this->newFolder('/' . $userId . '/files');
+                }
+            } else {
+                $folder = new LazyUserFolder($this, $userObject, $this->mountManager);
+            }
+
+            $this->userFolderCache->set($userId, $folder);
+        }
+
+        return $this->userFolderCache->get($userId);
+    }
+
+    public function getUserMountCache() {
+        return $this->userMountCache;
+    }
+
+    public function getFirstNodeByIdInPath(int $id, string $path): ?INode {
+        // scope the cache by user, so we don't return nodes for different users
+        if ($this->user) {
+            $cachedPath = $this->pathByIdCache->get($this->user->getUID() . '::' . $id);
+            if ($cachedPath && str_starts_with($cachedPath, $path)) {
+                // getting the node by path is significantly cheaper than finding it by id
+                try {
+                    $node = $this->get($cachedPath);
+                    // by validating that the cached path still has the requested fileid we can work around the need to invalidate the cached path
+                    // if the cached path is invalid or a different file now we fall back to the uncached logic
+                    if ($node && $node->getId() === $id) {
+                        return $node;
+                    }
+                } catch (NotFoundException|NotPermittedException) {
+                    // The file may be moved but the old path still in cache
+                }
+            }
+        }
+        $node = current($this->getByIdInPath($id, $path));
+        if (!$node) {
+            return null;
+        }
+
+        if ($this->user) {
+            $this->pathByIdCache->set($this->user->getUID() . '::' . $id, $node->getPath());
+        }
+        return $node;
+    }
+
+    /**
+     * @param int $id
+     * @return Node[]
+     */
+    public function getByIdInPath(int $id, string $path): array {
+        $mountCache = $this->getUserMountCache();
+        if (strpos($path, '/', 1) > 0) {
+            [, $user] = explode('/', $path);
+        } else {
+            $user = null;
+        }
+        $mountsContainingFile = $mountCache->getMountsForFileId($id, $user);
+
+        // if the mount isn't in the cache yet, perform a setup first, then try again
+        if (count($mountsContainingFile) === 0) {
+            $this->mountManager->getSetupManager()->setupForPath($path, true);
+            $mountsContainingFile = $mountCache->getMountsForFileId($id, $user);
+        }
+
+        // when a user has access through the same storage through multiple paths
+        // (such as an external storage that is both mounted for a user and shared to the user)
+        // the mount cache will only hold a single entry for the storage
+        // this can lead to issues as the different ways the user has access to a storage can have different permissions
+        //
+        // so instead of using the cached entries directly, we instead filter the current mounts by the rootid of the cache entry
+
+        $mountRootIds = array_map(function ($mount) {
+            return $mount->getRootId();
+        }, $mountsContainingFile);
+        $mountRootPaths = array_map(function ($mount) {
+            return $mount->getRootInternalPath();
+        }, $mountsContainingFile);
+        $mountProviders = array_unique(array_map(function ($mount) {
+            return $mount->getMountProvider();
+        }, $mountsContainingFile));
+        $mountRoots = array_combine($mountRootIds, $mountRootPaths);
+
+        $mounts = $this->mountManager->getMountsByMountProvider($path, $mountProviders);
+
+        $mountsContainingFile = array_filter($mounts, function ($mount) use ($mountRoots) {
+            return isset($mountRoots[$mount->getStorageRootId()]);
+        });
+
+        if (count($mountsContainingFile) === 0) {
+            if ($user === $this->getAppDataDirectoryName()) {
+                $folder = $this->get($path);
+                if ($folder instanceof Folder) {
+                    return $folder->getByIdInRootMount($id);
+                } else {
+                    throw new \Exception('getByIdInPath with non folder');
+                }
+            }
+            return [];
+        }
+
+        $nodes = array_map(function (IMountPoint $mount) use ($id, $mountRoots) {
+            $rootInternalPath = $mountRoots[$mount->getStorageRootId()];
+            $cacheEntry = $mount->getStorage()->getCache()->get($id);
+            if (!$cacheEntry) {
+                return null;
+            }
+
+            // cache jails will hide the "true" internal path
+            $internalPath = ltrim($rootInternalPath . '/' . $cacheEntry->getPath(), '/');
+            $pathRelativeToMount = substr($internalPath, strlen($rootInternalPath));
+            $pathRelativeToMount = ltrim($pathRelativeToMount, '/');
+            $absolutePath = rtrim($mount->getMountPoint() . $pathRelativeToMount, '/');
+            $storage = $mount->getStorage();
+            if ($storage === null) {
+                return null;
+            }
+            $ownerId = $storage->getOwner($pathRelativeToMount);
+            if ($ownerId !== false) {
+                $owner = Server::get(IUserManager::class)->get($ownerId);
+            } else {
+                $owner = null;
+            }
+            return $this->createNode($absolutePath, new FileInfo(
+                $absolutePath,
+                $storage,
+                $cacheEntry->getPath(),
+                $cacheEntry,
+                $mount,
+                $owner,
+            ));
+        }, $mountsContainingFile);
+
+        $nodes = array_filter($nodes);
+
+        $folders = array_filter($nodes, function (Node $node) use ($path) {
+            return PathHelper::getRelativePath($path, $node->getPath()) !== null;
+        });
+        usort($folders, function ($a, $b) {
+            return $b->getPath() <=> $a->getPath();
+        });
+        return $folders;
+    }
+
+    public function getNodeFromCacheEntryAndMount(ICacheEntry $cacheEntry, IMountPoint $mountPoint): INode {
+        $path = $cacheEntry->getPath();
+        $fullPath = $mountPoint->getMountPoint() . $path;
+        // todo: LazyNode?
+        $info = new FileInfo($fullPath, $mountPoint->getStorage(), $path, $cacheEntry, $mountPoint);
+        $parentPath = dirname($fullPath);
+        $parent = new LazyFolder($this, function () use ($parentPath) {
+            $parent = $this->get($parentPath);
+            if ($parent instanceof \OCP\Files\Folder) {
+                return $parent;
+            } else {
+                throw new \Exception("parent $parentPath is not a folder");
+            }
+        }, [
+            'path' => $parentPath,
+        ]);
+        $isDir = $info->getType() === FileInfo::TYPE_FOLDER;
+        $view = new View('');
+        if ($isDir) {
+            return new Folder($this, $view, $fullPath, $info, $parent);
+        } else {
+            return new File($this, $view, $fullPath, $info, $parent);
+        }
+    }
 }