nextcloud/lib/private/connector/sabre/file.php

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<?php
/**
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* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
* @author chli1 <chli1@users.noreply.github.com>
* @author Chris Wilson <chris+github@qwirx.com>
* @author Jakob Sack <mail@jakobsack.de>
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Owen Winkler <a_github@midnightcircus.com>
* @author Robin Appelman <icewind@owncloud.com>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Thomas Tanghus <thomas@tanghus.net>
* @author Vincent Petry <pvince81@owncloud.com>
*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
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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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* This program is distributed in the hope that it will be useful,
* 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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* 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/>
*
*/
namespace OC\Connector\Sabre;
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use OCP\Encryption\Exceptions\GenericEncryptionException;
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class File extends \OC\Connector\Sabre\Node implements \Sabre\DAV\IFile {
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/**
* Updates the data
*
* The data argument is a readable stream resource.
*
* After a successful put operation, you may choose to return an ETag. The
* etag must always be surrounded by double-quotes. These quotes must
* appear in the actual string you're returning.
*
* Clients may use the ETag from a PUT request to later on make sure that
* when they update the file, the contents haven't changed in the mean
* time.
*
* If you don't plan to store the file byte-by-byte, and you return a
* different object on a subsequent GET you are strongly recommended to not
* return an ETag, and just return null.
*
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* @param resource $data
*
* @throws \Sabre\DAV\Exception\Forbidden
* @throws \OC\Connector\Sabre\Exception\UnsupportedMediaType
* @throws \Sabre\DAV\Exception\BadRequest
* @throws \Sabre\DAV\Exception
* @throws \OC\Connector\Sabre\Exception\EntityTooLarge
* @throws \Sabre\DAV\Exception\ServiceUnavailable
* @return string|null
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*/
public function put($data) {
try {
if ($this->info && $this->fileView->file_exists($this->path) &&
!$this->info->isUpdateable()) {
throw new \Sabre\DAV\Exception\Forbidden();
}
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("File is not updatable: ".$e->getMessage());
}
// verify path of the target
$this->verifyPath();
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// chunked handling
if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
return $this->createFileChunked($data);
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}
list($storage) = $this->fileView->resolvePath($this->path);
$needsPartFile = $this->needsPartFile($storage) && (strlen($this->path) > 1);
if ($needsPartFile) {
// mark file as partial while uploading (ignored by the scanner)
$partFilePath = $this->path . '.ocTransferId' . rand() . '.part';
} else {
// upload file directly as the final path
$partFilePath = $this->path;
}
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try {
$putOkay = $this->fileView->file_put_contents($partFilePath, $data);
if ($putOkay === false) {
\OC_Log::write('webdav', '\OC\Files\Filesystem::file_put_contents() failed', \OC_Log::ERROR);
$this->fileView->unlink($partFilePath);
// because we have no clue about the cause we can only throw back a 500/Internal Server Error
throw new \Sabre\DAV\Exception('Could not write file contents');
}
} catch (\OCP\Files\NotPermittedException $e) {
// a more general case - due to whatever reason the content could not be written
throw new \Sabre\DAV\Exception\Forbidden($e->getMessage());
} catch (\OCP\Files\EntityTooLargeException $e) {
// the file is too big to be stored
throw new \OC\Connector\Sabre\Exception\EntityTooLarge($e->getMessage());
} catch (\OCP\Files\InvalidContentException $e) {
// the file content is not permitted
throw new \OC\Connector\Sabre\Exception\UnsupportedMediaType($e->getMessage());
} catch (\OCP\Files\InvalidPathException $e) {
// the path for the file was not valid
// TODO: find proper http status code for this case
throw new \Sabre\DAV\Exception\Forbidden($e->getMessage());
} catch (\OCP\Files\LockNotAcquiredException $e) {
// the file is currently being written to by another process
throw new \OC\Connector\Sabre\Exception\FileLocked($e->getMessage(), $e->getCode(), $e);
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} catch (GenericEncryptionException $e) {
throw new \Sabre\DAV\Exception\Forbidden($e->getMessage());
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("Failed to write file contents: ".$e->getMessage());
}
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try {
// if content length is sent by client:
// double check if the file was fully received
// compare expected and actual size
if (isset($_SERVER['CONTENT_LENGTH']) && $_SERVER['REQUEST_METHOD'] !== 'LOCK') {
$expected = $_SERVER['CONTENT_LENGTH'];
$actual = $this->fileView->filesize($partFilePath);
if ($actual != $expected) {
$this->fileView->unlink($partFilePath);
throw new \Sabre\DAV\Exception\BadRequest('expected filesize ' . $expected . ' got ' . $actual);
}
}
if ($needsPartFile) {
// rename to correct path
try {
$renameOkay = $this->fileView->rename($partFilePath, $this->path);
$fileExists = $this->fileView->file_exists($this->path);
if ($renameOkay === false || $fileExists === false) {
\OC_Log::write('webdav', '\OC\Files\Filesystem::rename() failed', \OC_Log::ERROR);
$this->fileView->unlink($partFilePath);
throw new \Sabre\DAV\Exception('Could not rename part file to final file');
}
}
catch (\OCP\Files\LockNotAcquiredException $e) {
// the file is currently being written to by another process
throw new \OC\Connector\Sabre\Exception\FileLocked($e->getMessage(), $e->getCode(), $e);
}
}
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// allow sync clients to send the mtime along in a header
$request = \OC::$server->getRequest();
if (isset($request->server['HTTP_X_OC_MTIME'])) {
if($this->fileView->touch($this->path, $request->server['HTTP_X_OC_MTIME'])) {
header('X-OC-MTime: accepted');
}
}
$this->refreshInfo();
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("Failed to check file size: ".$e->getMessage());
}
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return '"' . $this->info->getEtag() . '"';
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}
/**
* Returns the data
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* @return string|resource
* @throws \Sabre\DAV\Exception\Forbidden
* @throws \Sabre\DAV\Exception\ServiceUnavailable
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*/
public function get() {
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//throw exception if encryption is disabled but files are still encrypted
try {
return $this->fileView->fopen(ltrim($this->path, '/'), 'rb');
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} catch (\OCP\Encryption\Exceptions\GenericEncryptionException $e) {
throw new \Sabre\DAV\Exception\Forbidden($e->getMessage());
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("Failed to open file: ".$e->getMessage());
}
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}
/**
* Delete the current file
* @throws \Sabre\DAV\Exception\Forbidden
* @throws \Sabre\DAV\Exception\ServiceUnavailable
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*/
public function delete() {
if (!$this->info->isDeletable()) {
throw new \Sabre\DAV\Exception\Forbidden();
}
try {
if (!$this->fileView->unlink($this->path)) {
// assume it wasn't possible to delete due to permissions
throw new \Sabre\DAV\Exception\Forbidden();
}
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("Failed to unlink: ".$e->getMessage());
}
}
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/**
* Returns the mime-type for a file
*
* If null is returned, we'll assume application/octet-stream
*
* @return mixed
*/
public function getContentType() {
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$mimeType = $this->info->getMimetype();
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// PROPFIND needs to return the correct mime type, for consistency with the web UI
if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PROPFIND' ) {
return $mimeType;
}
return \OC_Helper::getSecureMimeType($mimeType);
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}
/**
* @return array|false
*/
public function getDirectDownload() {
if (\OCP\App::isEnabled('encryption')) {
return [];
}
/** @var \OCP\Files\Storage $storage */
list($storage, $internalPath) = $this->fileView->resolvePath($this->path);
if (is_null($storage)) {
return [];
}
return $storage->getDirectDownload($internalPath);
}
/**
* @param resource $data
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* @return null|string
* @throws \Sabre\DAV\Exception
* @throws \Sabre\DAV\Exception\BadRequest
* @throws \Sabre\DAV\Exception\NotImplemented
* @throws \Sabre\DAV\Exception\ServiceUnavailable
*/
private function createFileChunked($data)
{
list($path, $name) = \Sabre\HTTP\URLUtil::splitPath($this->path);
$info = \OC_FileChunking::decodeName($name);
if (empty($info)) {
throw new \Sabre\DAV\Exception\NotImplemented();
}
$chunk_handler = new \OC_FileChunking($info);
$bytesWritten = $chunk_handler->store($info['index'], $data);
//detect aborted upload
if (isset ($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'PUT' ) {
if (isset($_SERVER['CONTENT_LENGTH'])) {
$expected = $_SERVER['CONTENT_LENGTH'];
if ($bytesWritten != $expected) {
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$chunk_handler->remove($info['index']);
throw new \Sabre\DAV\Exception\BadRequest(
'expected filesize ' . $expected . ' got ' . $bytesWritten);
}
}
}
if ($chunk_handler->isComplete()) {
list($storage, ) = $this->fileView->resolvePath($path);
$needsPartFile = $this->needsPartFile($storage);
try {
$targetPath = $path . '/' . $info['name'];
if ($needsPartFile) {
// we first assembly the target file as a part file
$partFile = $path . '/' . $info['name'] . '.ocTransferId' . $info['transferid'] . '.part';
$chunk_handler->file_assemble($partFile);
// here is the final atomic rename
$renameOkay = $this->fileView->rename($partFile, $targetPath);
$fileExists = $this->fileView->file_exists($targetPath);
if ($renameOkay === false || $fileExists === false) {
\OC_Log::write('webdav', '\OC\Files\Filesystem::rename() failed', \OC_Log::ERROR);
// only delete if an error occurred and the target file was already created
if ($fileExists) {
$this->fileView->unlink($targetPath);
}
throw new \Sabre\DAV\Exception('Could not rename part file assembled from chunks');
}
} else {
// assemble directly into the final file
$chunk_handler->file_assemble($targetPath);
}
// allow sync clients to send the mtime along in a header
$request = \OC::$server->getRequest();
if (isset($request->server['HTTP_X_OC_MTIME'])) {
if($this->fileView->touch($targetPath, $request->server['HTTP_X_OC_MTIME'])) {
header('X-OC-MTime: accepted');
}
}
$info = $this->fileView->getFileInfo($targetPath);
return $info->getEtag();
} catch (\OCP\Files\StorageNotAvailableException $e) {
throw new \Sabre\DAV\Exception\ServiceUnavailable("Failed to put file: ".$e->getMessage());
}
}
return null;
}
/**
* Returns whether a part file is needed for the given storage
* or whether the file can be assembled/uploaded directly on the
* target storage.
* @param \OCP\Files\Storage $storage
* @return bool true if the storage needs part file handling
*/
private function needsPartFile($storage) {
// TODO: in the future use ChunkHandler provided by storage
// and/or add method on Storage called "needsPartFile()"
return !$storage->instanceOfStorage('OCA\Files_Sharing\External\Storage') &&
!$storage->instanceOfStorage('OC\Files\Storage\OwnCloud');
}
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}