nextcloud/lib/private/Files/ObjectStore/ObjectStoreStorage.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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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.
*
* 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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*
*/
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namespace OC\Files\ObjectStore;
use Icewind\Streams\CallbackWrapper;
use Icewind\Streams\IteratorDirectory;
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use OC\Files\Cache\CacheEntry;
use OCP\Files\ObjectStore\IObjectStore;
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class ObjectStoreStorage extends \OC\Files\Storage\Common {
/**
* @var \OCP\Files\ObjectStore\IObjectStore $objectStore
*/
protected $objectStore;
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/**
* @var string $id
*/
protected $id;
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/**
* @var \OC\User\User $user
*/
protected $user;
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private $objectPrefix = 'urn:oid:';
private $logger;
public function __construct($params) {
if (isset($params['objectstore']) && $params['objectstore'] instanceof IObjectStore) {
$this->objectStore = $params['objectstore'];
} else {
throw new \Exception('missing IObjectStore instance');
}
if (isset($params['storageid'])) {
$this->id = 'object::store:' . $params['storageid'];
} else {
$this->id = 'object::store:' . $this->objectStore->getStorageId();
}
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if (isset($params['objectPrefix'])) {
$this->objectPrefix = $params['objectPrefix'];
}
//initialize cache with root directory in cache
if (!$this->is_dir('/')) {
$this->mkdir('/');
}
$this->logger = \OC::$server->getLogger();
}
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public function mkdir($path) {
$path = $this->normalizePath($path);
if ($this->file_exists($path)) {
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return false;
}
$mTime = time();
$data = [
'mimetype' => 'httpd/unix-directory',
'size' => 0,
'mtime' => $mTime,
'storage_mtime' => $mTime,
'permissions' => \OCP\Constants::PERMISSION_ALL,
];
if ($path === '') {
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//create root on the fly
$data['etag'] = $this->getETag('');
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$this->getCache()->put('', $data);
return true;
} else {
// if parent does not exist, create it
$parent = $this->normalizePath(dirname($path));
$parentType = $this->filetype($parent);
if ($parentType === false) {
if (!$this->mkdir($parent)) {
// something went wrong
return false;
}
} else if ($parentType === 'file') {
// parent is a file
return false;
}
// finally create the new dir
$mTime = time(); // update mtime
$data['mtime'] = $mTime;
$data['storage_mtime'] = $mTime;
$data['etag'] = $this->getETag($path);
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$this->getCache()->put($path, $data);
return true;
}
}
/**
* @param string $path
* @return string
*/
private function normalizePath($path) {
$path = trim($path, '/');
//FIXME why do we sometimes get a path like 'files//username'?
$path = str_replace('//', '/', $path);
// dirname('/folder') returns '.' but internally (in the cache) we store the root as ''
if (!$path || $path === '.') {
$path = '';
}
return $path;
}
/**
* Object Stores use a NoopScanner because metadata is directly stored in
* the file cache and cannot really scan the filesystem. The storage passed in is not used anywhere.
*
* @param string $path
* @param \OC\Files\Storage\Storage (optional) the storage to pass to the scanner
* @return \OC\Files\ObjectStore\NoopScanner
*/
public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
if (!isset($this->scanner)) {
$this->scanner = new NoopScanner($storage);
}
return $this->scanner;
}
public function getId() {
return $this->id;
}
public function rmdir($path) {
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$path = $this->normalizePath($path);
if (!$this->is_dir($path)) {
return false;
}
$this->rmObjects($path);
$this->getCache()->remove($path);
return true;
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}
private function rmObjects($path) {
$children = $this->getCache()->getFolderContents($path);
foreach ($children as $child) {
if ($child['mimetype'] === 'httpd/unix-directory') {
$this->rmObjects($child['path']);
} else {
$this->unlink($child['path']);
}
}
}
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public function unlink($path) {
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$path = $this->normalizePath($path);
$stat = $this->stat($path);
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if ($stat && isset($stat['fileid'])) {
if ($stat['mimetype'] === 'httpd/unix-directory') {
return $this->rmdir($path);
}
try {
$this->objectStore->deleteObject($this->getURN($stat['fileid']));
} catch (\Exception $ex) {
if ($ex->getCode() !== 404) {
$this->logger->logException($ex, [
'app' => 'objectstore',
'message' => 'Could not delete object ' . $this->getURN($stat['fileid']) . ' for ' . $path,
]);
return false;
} else {
//removing from cache is ok as it does not exist in the objectstore anyway
}
}
$this->getCache()->remove($path);
return true;
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}
return false;
}
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public function stat($path) {
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$path = $this->normalizePath($path);
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$cacheEntry = $this->getCache()->get($path);
if ($cacheEntry instanceof CacheEntry) {
return $cacheEntry->getData();
} else {
return false;
}
}
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/**
* Override this method if you need a different unique resource identifier for your object storage implementation.
* The default implementations just appends the fileId to 'urn:oid:'. Make sure the URN is unique over all users.
* You may need a mapping table to store your URN if it cannot be generated from the fileid.
*
* @param int $fileId the fileid
* @return null|string the unified resource name used to identify the object
*/
protected function getURN($fileId) {
if (is_numeric($fileId)) {
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return $this->objectPrefix . $fileId;
}
return null;
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}
public function opendir($path) {
$path = $this->normalizePath($path);
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try {
$files = array();
$folderContents = $this->getCache()->getFolderContents($path);
foreach ($folderContents as $file) {
$files[] = $file['name'];
}
return IteratorDirectory::wrap($files);
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} catch (\Exception $e) {
$this->logger->logException($e);
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return false;
}
}
public function filetype($path) {
$path = $this->normalizePath($path);
$stat = $this->stat($path);
if ($stat) {
if ($stat['mimetype'] === 'httpd/unix-directory') {
return 'dir';
}
return 'file';
} else {
return false;
}
}
public function fopen($path, $mode) {
$path = $this->normalizePath($path);
switch ($mode) {
case 'r':
case 'rb':
$stat = $this->stat($path);
if (is_array($stat)) {
try {
return $this->objectStore->readObject($this->getURN($stat['fileid']));
} catch (\Exception $ex) {
$this->logger->logException($ex, [
'app' => 'objectstore',
'message' => 'Count not get object ' . $this->getURN($stat['fileid']) . ' for file ' . $path,
]);
return false;
}
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} else {
return false;
}
case 'w':
case 'wb':
case 'a':
case 'ab':
case 'r+':
case 'w+':
case 'wb+':
case 'a+':
case 'x':
case 'x+':
case 'c':
case 'c+':
if (strrpos($path, '.') !== false) {
$ext = substr($path, strrpos($path, '.'));
} else {
$ext = '';
}
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$tmpFile = \OC::$server->getTempManager()->getTemporaryFile($ext);
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if ($this->file_exists($path)) {
$source = $this->fopen($path, 'r');
file_put_contents($tmpFile, $source);
}
$handle = fopen($tmpFile, $mode);
return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile) {
$this->writeBack($tmpFile, $path);
});
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}
return false;
}
public function file_exists($path) {
$path = $this->normalizePath($path);
return (bool)$this->stat($path);
}
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public function rename($source, $target) {
$source = $this->normalizePath($source);
$target = $this->normalizePath($target);
$this->remove($target);
$this->getCache()->move($source, $target);
$this->touch(dirname($target));
return true;
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}
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public function getMimeType($path) {
$path = $this->normalizePath($path);
$stat = $this->stat($path);
if (is_array($stat)) {
return $stat['mimetype'];
} else {
return false;
}
}
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public function touch($path, $mtime = null) {
if (is_null($mtime)) {
$mtime = time();
}
$path = $this->normalizePath($path);
$dirName = dirname($path);
$parentExists = $this->is_dir($dirName);
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if (!$parentExists) {
return false;
}
$stat = $this->stat($path);
if (is_array($stat)) {
// update existing mtime in db
$stat['mtime'] = $mtime;
$this->getCache()->update($stat['fileid'], $stat);
} else {
$mimeType = \OC::$server->getMimeTypeDetector()->detectPath($path);
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// create new file
$stat = array(
'etag' => $this->getETag($path),
'mimetype' => $mimeType,
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'size' => 0,
'mtime' => $mtime,
'storage_mtime' => $mtime,
'permissions' => \OCP\Constants::PERMISSION_ALL - \OCP\Constants::PERMISSION_CREATE,
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);
$fileId = $this->getCache()->put($path, $stat);
try {
//read an empty file from memory
$this->objectStore->writeObject($this->getURN($fileId), fopen('php://memory', 'r'));
} catch (\Exception $ex) {
$this->getCache()->remove($path);
$this->logger->logException($ex, [
'app' => 'objectstore',
'message' => 'Could not create object ' . $this->getURN($fileId) . ' for ' . $path,
]);
return false;
}
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}
return true;
}
public function writeBack($tmpFile, $path) {
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$stat = $this->stat($path);
if (empty($stat)) {
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// create new file
$stat = array(
'permissions' => \OCP\Constants::PERMISSION_ALL - \OCP\Constants::PERMISSION_CREATE,
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);
}
// update stat with new data
$mTime = time();
$stat['size'] = filesize($tmpFile);
$stat['mtime'] = $mTime;
$stat['storage_mtime'] = $mTime;
$stat['mimetype'] = \OC::$server->getMimeTypeDetector()->detect($tmpFile);
$stat['etag'] = $this->getETag($path);
$fileId = $this->getCache()->put($path, $stat);
try {
//upload to object storage
$this->objectStore->writeObject($this->getURN($fileId), fopen($tmpFile, 'r'));
} catch (\Exception $ex) {
$this->getCache()->remove($path);
$this->logger->logException($ex, [
'app' => 'objectstore',
'message' => 'Could not create object ' . $this->getURN($fileId) . ' for ' . $path,
]);
throw $ex; // make this bubble up
}
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}
/**
* external changes are not supported, exclusive access to the object storage is assumed
*
* @param string $path
* @param int $time
* @return false
*/
public function hasUpdated($path, $time) {
return false;
}
}