379 lines
13 KiB
PHP
379 lines
13 KiB
PHP
<?php
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/**
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Björn Schießle <schiessle@owncloud.com>
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* @author chli1 <chli1@users.noreply.github.com>
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* @author Chris Wilson <chris+github@qwirx.com>
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* @author Jakob Sack <mail@jakobsack.de>
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* @author Joas Schilling <nickvergessen@owncloud.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Owen Winkler <a_github@midnightcircus.com>
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* @author Robin Appelman <icewind@owncloud.com>
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* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Thomas Tanghus <thomas@tanghus.net>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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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
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* it under the terms of the GNU Affero General Public License, version 3,
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* 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
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* 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,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Connector\Sabre;
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use OC\Connector\Sabre\Exception\EntityTooLarge;
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use OC\Connector\Sabre\Exception\FileLocked;
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use OC\Connector\Sabre\Exception\UnsupportedMediaType;
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use OCP\Encryption\Exceptions\GenericEncryptionException;
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use OCP\Files\EntityTooLargeException;
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use OCP\Files\InvalidContentException;
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use OCP\Files\InvalidPathException;
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use OCP\Files\LockNotAcquiredException;
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use OCP\Files\NotPermittedException;
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use OCP\Files\StorageNotAvailableException;
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use Sabre\DAV\Exception;
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use Sabre\DAV\Exception\BadRequest;
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use Sabre\DAV\Exception\Forbidden;
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use Sabre\DAV\Exception\NotImplemented;
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use Sabre\DAV\Exception\ServiceUnavailable;
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use Sabre\DAV\IFile;
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class File extends Node implements IFile {
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/**
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* Updates the data
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*
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* The data argument is a readable stream resource.
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*
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* After a successful put operation, you may choose to return an ETag. The
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* etag must always be surrounded by double-quotes. These quotes must
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* appear in the actual string you're returning.
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*
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* Clients may use the ETag from a PUT request to later on make sure that
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* when they update the file, the contents haven't changed in the mean
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* time.
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*
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* If you don't plan to store the file byte-by-byte, and you return a
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* different object on a subsequent GET you are strongly recommended to not
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* return an ETag, and just return null.
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*
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* @param resource $data
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*
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* @throws Forbidden
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* @throws UnsupportedMediaType
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* @throws BadRequest
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* @throws Exception
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* @throws EntityTooLarge
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* @throws ServiceUnavailable
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* @return string|null
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*/
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public function put($data) {
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try {
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$exists = $this->fileView->file_exists($this->path);
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if ($this->info && $exists && !$this->info->isUpdateable()) {
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throw new Forbidden();
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}
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("File is not updatable: " . $e->getMessage());
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}
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// verify path of the target
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$this->verifyPath();
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// chunked handling
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if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
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return $this->createFileChunked($data);
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}
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list($partStorage) = $this->fileView->resolvePath($this->path);
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$needsPartFile = $this->needsPartFile($partStorage) && (strlen($this->path) > 1);
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if ($needsPartFile) {
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// mark file as partial while uploading (ignored by the scanner)
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$partFilePath = $this->path . '.ocTransferId' . rand() . '.part';
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} else {
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// upload file directly as the final path
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$partFilePath = $this->path;
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}
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// the part file and target file might be on a different storage in case of a single file storage (e.g. single file share)
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/** @var \OC\Files\Storage\Storage $partStorage */
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list($partStorage, $internalPartPath) = $this->fileView->resolvePath($partFilePath);
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/** @var \OC\Files\Storage\Storage $storage */
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list($storage, $internalPath) = $this->fileView->resolvePath($this->path);
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try {
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$target = $partStorage->fopen($internalPartPath, 'wb');
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if ($target === false) {
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\OC_Log::write('webdav', '\OC\Files\Filesystem::fopen() failed', \OC_Log::ERROR);
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$partStorage->unlink($internalPartPath);
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// because we have no clue about the cause we can only throw back a 500/Internal Server Error
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throw new Exception('Could not write file contents');
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}
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list($count, ) = \OC_Helper::streamCopy($data, $target);
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fclose($target);
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// if content length is sent by client:
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// double check if the file was fully received
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// compare expected and actual size
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if (isset($_SERVER['CONTENT_LENGTH']) && $_SERVER['REQUEST_METHOD'] !== 'LOCK') {
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$expected = $_SERVER['CONTENT_LENGTH'];
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if ($count != $expected) {
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$partStorage->unlink($internalPartPath);
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throw new BadRequest('expected filesize ' . $expected . ' got ' . $count);
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}
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}
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} catch (NotPermittedException $e) {
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// a more general case - due to whatever reason the content could not be written
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throw new Forbidden($e->getMessage());
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} catch (EntityTooLargeException $e) {
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// the file is too big to be stored
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throw new EntityTooLarge($e->getMessage());
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} catch (InvalidContentException $e) {
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// the file content is not permitted
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throw new UnsupportedMediaType($e->getMessage());
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} catch (InvalidPathException $e) {
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// the path for the file was not valid
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// TODO: find proper http status code for this case
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throw new Forbidden($e->getMessage());
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} catch (LockNotAcquiredException $e) {
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// the file is currently being written to by another process
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throw new FileLocked($e->getMessage(), $e->getCode(), $e);
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} catch (GenericEncryptionException $e) {
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// returning 503 will allow retry of the operation at a later point in time
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throw new ServiceUnavailable("Encryption not ready: " . $e->getMessage());
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("Failed to write file contents: " . $e->getMessage());
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}
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try {
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if ($needsPartFile) {
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// rename to correct path
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try {
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$renameOkay = $storage->moveFromStorage($partStorage, $internalPartPath, $internalPath);
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$fileExists = $storage->file_exists($internalPath);
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if ($renameOkay === false || $fileExists === false) {
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\OC_Log::write('webdav', '\OC\Files\Filesystem::rename() failed', \OC_Log::ERROR);
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$partStorage->unlink($internalPartPath);
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throw new Exception('Could not rename part file to final file');
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}
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} catch (\OCP\Files\LockNotAcquiredException $e) {
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// the file is currently being written to by another process
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throw new FileLocked($e->getMessage(), $e->getCode(), $e);
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}
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}
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// since we skipped the view we need to scan and emit the hooks ourselves
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$partStorage->getScanner()->scanFile($internalPath);
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$view = \OC\Files\Filesystem::getView();
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if ($view) {
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$hookPath = $view->getRelativePath($this->fileView->getAbsolutePath($this->path));
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$this->fileView->getUpdater()->propagate($hookPath);
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if (!$exists) {
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\OC_Hook::emit(\OC\Files\Filesystem::CLASSNAME, \OC\Files\Filesystem::signal_post_create, array(
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\OC\Files\Filesystem::signal_param_path => $hookPath
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));
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} else {
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\OC_Hook::emit(\OC\Files\Filesystem::CLASSNAME, \OC\Files\Filesystem::signal_post_update, array(
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\OC\Files\Filesystem::signal_param_path => $hookPath
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));
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}
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\OC_Hook::emit(\OC\Files\Filesystem::CLASSNAME, \OC\Files\Filesystem::signal_post_write, array(
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\OC\Files\Filesystem::signal_param_path => $hookPath
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));
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}
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// allow sync clients to send the mtime along in a header
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$request = \OC::$server->getRequest();
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if (isset($request->server['HTTP_X_OC_MTIME'])) {
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if ($this->fileView->touch($this->path, $request->server['HTTP_X_OC_MTIME'])) {
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header('X-OC-MTime: accepted');
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}
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}
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$this->refreshInfo();
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("Failed to check file size: " . $e->getMessage());
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}
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return '"' . $this->info->getEtag() . '"';
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}
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/**
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* Returns the data
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*
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* @return string|resource
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* @throws Forbidden
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* @throws ServiceUnavailable
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*/
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public function get() {
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//throw exception if encryption is disabled but files are still encrypted
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try {
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return $this->fileView->fopen(ltrim($this->path, '/'), 'rb');
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} catch (GenericEncryptionException $e) {
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// returning 503 will allow retry of the operation at a later point in time
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throw new ServiceUnavailable("Encryption not ready: " . $e->getMessage());
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("Failed to open file: " . $e->getMessage());
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}
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}
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/**
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* Delete the current file
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*
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* @throws Forbidden
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* @throws ServiceUnavailable
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*/
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public function delete() {
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if (!$this->info->isDeletable()) {
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throw new Forbidden();
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}
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try {
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if (!$this->fileView->unlink($this->path)) {
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// assume it wasn't possible to delete due to permissions
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throw new Forbidden();
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}
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("Failed to unlink: " . $e->getMessage());
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}
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}
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/**
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* Returns the mime-type for a file
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*
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* If null is returned, we'll assume application/octet-stream
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*
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* @return mixed
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*/
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public function getContentType() {
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$mimeType = $this->info->getMimetype();
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// PROPFIND needs to return the correct mime type, for consistency with the web UI
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if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PROPFIND') {
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return $mimeType;
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}
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return \OC_Helper::getSecureMimeType($mimeType);
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}
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/**
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* @return array|false
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*/
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public function getDirectDownload() {
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if (\OCP\App::isEnabled('encryption')) {
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return [];
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}
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/** @var \OCP\Files\Storage $storage */
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list($storage, $internalPath) = $this->fileView->resolvePath($this->path);
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if (is_null($storage)) {
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return [];
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}
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return $storage->getDirectDownload($internalPath);
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}
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/**
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* @param resource $data
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* @return null|string
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* @throws Exception
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* @throws BadRequest
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* @throws NotImplemented
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* @throws ServiceUnavailable
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*/
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private function createFileChunked($data) {
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list($path, $name) = \Sabre\HTTP\URLUtil::splitPath($this->path);
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$info = \OC_FileChunking::decodeName($name);
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if (empty($info)) {
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throw new NotImplemented();
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}
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$chunk_handler = new \OC_FileChunking($info);
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$bytesWritten = $chunk_handler->store($info['index'], $data);
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//detect aborted upload
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if (isset ($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PUT') {
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if (isset($_SERVER['CONTENT_LENGTH'])) {
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$expected = $_SERVER['CONTENT_LENGTH'];
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if ($bytesWritten != $expected) {
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$chunk_handler->remove($info['index']);
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throw new BadRequest(
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'expected filesize ' . $expected . ' got ' . $bytesWritten);
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}
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}
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}
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if ($chunk_handler->isComplete()) {
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list($storage,) = $this->fileView->resolvePath($path);
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$needsPartFile = $this->needsPartFile($storage);
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try {
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$targetPath = $path . '/' . $info['name'];
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if ($needsPartFile) {
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// we first assembly the target file as a part file
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$partFile = $path . '/' . $info['name'] . '.ocTransferId' . $info['transferid'] . '.part';
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$chunk_handler->file_assemble($partFile);
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// here is the final atomic rename
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$renameOkay = $this->fileView->rename($partFile, $targetPath);
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$fileExists = $this->fileView->file_exists($targetPath);
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if ($renameOkay === false || $fileExists === false) {
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\OC_Log::write('webdav', '\OC\Files\Filesystem::rename() failed', \OC_Log::ERROR);
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// only delete if an error occurred and the target file was already created
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if ($fileExists) {
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$this->fileView->unlink($targetPath);
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}
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throw new Exception('Could not rename part file assembled from chunks');
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}
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} else {
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// assemble directly into the final file
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$chunk_handler->file_assemble($targetPath);
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}
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// allow sync clients to send the mtime along in a header
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$request = \OC::$server->getRequest();
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if (isset($request->server['HTTP_X_OC_MTIME'])) {
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if ($this->fileView->touch($targetPath, $request->server['HTTP_X_OC_MTIME'])) {
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header('X-OC-MTime: accepted');
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}
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}
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$info = $this->fileView->getFileInfo($targetPath);
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return $info->getEtag();
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} catch (StorageNotAvailableException $e) {
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throw new ServiceUnavailable("Failed to put file: " . $e->getMessage());
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}
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}
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return null;
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}
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/**
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* Returns whether a part file is needed for the given storage
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* or whether the file can be assembled/uploaded directly on the
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* target storage.
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*
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* @param \OCP\Files\Storage $storage
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* @return bool true if the storage needs part file handling
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*/
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private function needsPartFile($storage) {
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// TODO: in the future use ChunkHandler provided by storage
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// and/or add method on Storage called "needsPartFile()"
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return !$storage->instanceOfStorage('OCA\Files_Sharing\External\Storage') &&
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!$storage->instanceOfStorage('OC\Files\Storage\OwnCloud');
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}
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}
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