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

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<?php
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/**
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* ownCloud
*
* @author Jakob Sack
* @copyright 2011 Jakob Sack kde@jakobsack.de
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
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*/
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class OC_Connector_Sabre_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 $data
* @throws Sabre_DAV_Exception_Forbidden
* @return string|null
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*/
public function put($data) {
$fs = $this->getFS();
if ($fs->file_exists($this->path) &&
!$fs->isUpdatable($this->path)) {
throw new \Sabre_DAV_Exception_Forbidden();
}
// throw an exception if encryption was disabled but the files are still encrypted
if (\OC_Util::encryptedFiles()) {
throw new \Sabre_DAV_Exception_ServiceUnavailable();
}
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$fileName = basename($this->path);
if (!\OCP\Util::isValidFileName($fileName)) {
throw new \Sabre_DAV_Exception_BadRequest();
}
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// chunked handling
if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
return $this->createFileChunked($data);
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}
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// mark file as partial while uploading (ignored by the scanner)
$partpath = $this->path . '.ocTransferId' . rand() . '.part';
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// if file is located in /Shared we write the part file to the users
// root folder because we can't create new files in /shared
// we extend the name with a random number to avoid overwriting a existing file
if (dirname($partpath) === 'Shared') {
$partpath = pathinfo($partpath, PATHINFO_FILENAME) . rand() . '.part';
}
try {
$putOkay = $fs->file_put_contents($partpath, $data);
if ($putOkay === false) {
\OC_Log::write('webdav', '\OC\Files\Filesystem::file_put_contents() failed', \OC_Log::ERROR);
$fs->unlink($partpath);
// 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());
}
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// rename to correct path
$renameOkay = $fs->rename($partpath, $this->path);
$fileExists = $fs->file_exists($this->path);
if ($renameOkay === false || $fileExists === false) {
\OC_Log::write('webdav', '\OC\Files\Filesystem::rename() failed', \OC_Log::ERROR);
$fs->unlink($partpath);
throw new Sabre_DAV_Exception('Could not rename part file to final file');
}
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// allow sync clients to send the mtime along in a header
$mtime = OC_Request::hasModificationTime();
if ($mtime !== false) {
if($fs->touch($this->path, $mtime)) {
header('X-OC-MTime: accepted');
}
}
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return $this->getETagPropertyForPath($this->path);
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}
/**
* Returns the data
*
* @return string
*/
public function get() {
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//throw exception if encryption is disabled but files are still encrypted
if (\OC_Util::encryptedFiles()) {
throw new \Sabre_DAV_Exception_ServiceUnavailable();
} else {
return \OC\Files\Filesystem::fopen($this->path, 'rb');
}
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}
/**
* Delete the current file
*
* @return void
* @throws Sabre_DAV_Exception_Forbidden
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*/
public function delete() {
$fs = $this->getFS();
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if ($this->path === 'Shared') {
throw new \Sabre_DAV_Exception_Forbidden();
}
if (!$fs->isDeletable($this->path)) {
throw new \Sabre_DAV_Exception_Forbidden();
}
$fs->unlink($this->path);
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// remove properties
$this->removeProperties();
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}
/**
* Returns the size of the node, in bytes
*
* @return int
*/
public function getSize() {
$this->getFileinfoCache();
if ($this->fileinfo_cache['size'] > -1) {
return $this->fileinfo_cache['size'];
} else {
return null;
}
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}
/**
* Returns the ETag for a file
*
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* An ETag is a unique identifier representing the current version of the
* file. If the file changes, the ETag MUST change. The ETag is an
* arbitrary string, but MUST be surrounded by double-quotes.
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*
* Return null if the ETag can not effectively be determined
*
* @return mixed
*/
public function getETag() {
$properties = $this->getProperties(array(self::GETETAG_PROPERTYNAME));
if (isset($properties[self::GETETAG_PROPERTYNAME])) {
return $properties[self::GETETAG_PROPERTYNAME];
}
return null;
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}
/**
* Returns the mime-type for a file
*
* If null is returned, we'll assume application/octet-stream
*
* @return mixed
*/
public function getContentType() {
if (isset($this->fileinfo_cache['mimetype'])) {
return $this->fileinfo_cache['mimetype'];
}
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return \OC\Files\Filesystem::getMimeType($this->path);
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}
/**
* @param resource $data
*/
private function createFileChunked($data)
{
list($path, $name) = \Sabre_DAV_URLUtil::splitPath($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()) {
// 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
$fs = $this->getFS();
$targetPath = $path . '/' . $info['name'];
$renameOkay = $fs->rename($partFile, $targetPath);
$fileExists = $fs->file_exists($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) {
$fs->unlink($targetPath);
}
throw new Sabre_DAV_Exception('Could not rename part file assembled from chunks');
}
// allow sync clients to send the mtime along in a header
$mtime = OC_Request::hasModificationTime();
if ($mtime !== false) {
if($fs->touch($targetPath, $mtime)) {
header('X-OC-MTime: accepted');
}
}
return OC_Connector_Sabre_Node::getETagPropertyForPath($targetPath);
}
return null;
}
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}