lib/private/Files/Storage/Wrapper/Encoding.php
<?php
/**
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2018, ownCloud GmbH
* @license AGPL-3.0
*
* 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,
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Files\Storage\Wrapper;
use OC\Cache\CappedMemoryCache;
/**
* Encoding wrapper that deals with file names that use unsupported encodings like NFD.
*
* When applied and a UTF-8 path name was given, the wrapper will first attempt to access
* the actual given name and then try its NFD form.
*/
class Encoding extends Wrapper {
/**
* @var CappedMemoryCache
*/
private $namesCache;
/**
* @param array $parameters
*/
public function __construct($parameters) {
parent::__construct($parameters);
$this->namesCache = new CappedMemoryCache();
}
/**
* Returns whether the given string is only made of ASCII characters
*
* @param string $str string
*
* @return bool true if the string is all ASCII, false otherwise
*/
private function isAscii($str) {
return (bool) !\preg_match('/[\\x80-\\xff]+/', $str);
}
/**
* Checks whether the given path exists in NFC or NFD form after checking
* each form for each path section and returns the correct form.
* If no existing path found, returns the path as it was given.
*
* @param string $fullPath path to check
*
* @return string original or converted path
*/
private function findPathToUse($fullPath) {
$cachedPath = $this->namesCache[$fullPath];
if ($cachedPath !== null) {
return $cachedPath;
}
$sections = \explode('/', $fullPath);
$path = '';
foreach ($sections as $section) {
$convertedPath = $this->findPathToUseLastSection($path, $section);
if ($convertedPath === null) {
// no point in continuing if the section was not found, use original path
return $fullPath;
}
$path = $convertedPath . '/';
}
$path = \rtrim($path, '/');
return $path;
}
/**
* Checks whether the last path section of the given path exists in NFC or NFD form
* and returns the correct form. If no existing path found, returns null.
*
* @param string $basePath base path to check
* @param string $lastSection last section of the path to check for NFD/NFC variations
*
* @return string|null original or converted path, or null if none of the forms was found
*/
private function findPathToUseLastSection($basePath, $lastSection) {
$fullPath = $basePath . $lastSection;
if ($lastSection === '' || $this->isAscii($lastSection) || $this->storage->file_exists($fullPath)) {
$this->namesCache[$fullPath] = $fullPath;
return $fullPath;
}
// swap encoding
if (\Normalizer::isNormalized($lastSection, \Normalizer::FORM_C)) {
$otherFormPath = \Normalizer::normalize($lastSection, \Normalizer::FORM_D);
} else {
$otherFormPath = \Normalizer::normalize($lastSection, \Normalizer::FORM_C);
}
$otherFullPath = $basePath . $otherFormPath;
if ($this->storage->file_exists($otherFullPath)) {
$this->namesCache[$fullPath] = $otherFullPath;
return $otherFullPath;
}
// return original path, file did not exist at all
$this->namesCache[$fullPath] = $fullPath;
return null;
}
/**
* see http://php.net/manual/en/function.mkdir.php
*
* @param string $path
* @return bool
*/
public function mkdir($path) {
// note: no conversion here, method should not be called with non-NFC names!
$result = $this->storage->mkdir($path);
if ($result) {
$this->namesCache[$path] = $path;
}
return $result;
}
/**
* see http://php.net/manual/en/function.rmdir.php
*
* @param string $path
* @return bool
*/
public function rmdir($path) {
$result = $this->storage->rmdir($this->findPathToUse($path));
if ($result) {
unset($this->namesCache[$path]);
}
return $result;
}
/**
* see http://php.net/manual/en/function.opendir.php
*
* @param string $path
* @return resource
*/
public function opendir($path) {
return $this->storage->opendir($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.is_dir.php
*
* @param string $path
* @return bool
*/
public function is_dir($path) {
return $this->storage->is_dir($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.is_file.php
*
* @param string $path
* @return bool
*/
public function is_file($path) {
return $this->storage->is_file($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.stat.php
* only the following keys are required in the result: size and mtime
*
* @param string $path
* @return array
*/
public function stat($path) {
return $this->storage->stat($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.filetype.php
*
* @param string $path
* @return bool
*/
public function filetype($path) {
return $this->storage->filetype($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.filesize.php
* The result for filesize when called on a folder is required to be 0
*
* @param string $path
* @return int
*/
public function filesize($path) {
return $this->storage->filesize($this->findPathToUse($path));
}
/**
* check if a file can be created in $path
*
* @param string $path
* @return bool
*/
public function isCreatable($path) {
return $this->storage->isCreatable($this->findPathToUse($path));
}
/**
* check if a file can be read
*
* @param string $path
* @return bool
*/
public function isReadable($path) {
return $this->storage->isReadable($this->findPathToUse($path));
}
/**
* check if a file can be written to
*
* @param string $path
* @return bool
*/
public function isUpdatable($path) {
return $this->storage->isUpdatable($this->findPathToUse($path));
}
/**
* check if a file can be deleted
*
* @param string $path
* @return bool
*/
public function isDeletable($path) {
return $this->storage->isDeletable($this->findPathToUse($path));
}
/**
* check if a file can be shared
*
* @param string $path
* @return bool
*/
public function isSharable($path) {
return $this->storage->isSharable($this->findPathToUse($path));
}
/**
* get the full permissions of a path.
* Should return a combination of the PERMISSION_ constants defined in lib/public/constants.php
*
* @param string $path
* @return int
*/
public function getPermissions($path) {
return $this->storage->getPermissions($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.file_exists.php
*
* @param string $path
* @return bool
*/
public function file_exists($path) {
return $this->storage->file_exists($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.filemtime.php
*
* @param string $path
* @return int
*/
public function filemtime($path) {
return $this->storage->filemtime($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.file_get_contents.php
*
* @param string $path
* @return string
*/
public function file_get_contents($path) {
return $this->storage->file_get_contents($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.file_put_contents.php
*
* @param string $path
* @param string $data
* @return bool
*/
public function file_put_contents($path, $data) {
return $this->storage->file_put_contents($this->findPathToUse($path), $data);
}
/**
* see http://php.net/manual/en/function.unlink.php
*
* @param string $path
* @return bool
*/
public function unlink($path) {
$result = $this->storage->unlink($this->findPathToUse($path));
if ($result) {
unset($this->namesCache[$path]);
}
return $result;
}
/**
* see http://php.net/manual/en/function.rename.php
*
* @param string $path1
* @param string $path2
* @return bool
*/
public function rename($path1, $path2) {
// second name always NFC
return $this->storage->rename($this->findPathToUse($path1), $this->findPathToUse($path2));
}
/**
* see http://php.net/manual/en/function.copy.php
*
* @param string $path1
* @param string $path2
* @return bool
*/
public function copy($path1, $path2) {
return $this->storage->copy($this->findPathToUse($path1), $this->findPathToUse($path2));
}
/**
* see http://php.net/manual/en/function.fopen.php
*
* @param string $path
* @param string $mode
* @return resource
*/
public function fopen($path, $mode) {
$result = $this->storage->fopen($this->findPathToUse($path), $mode);
if ($result && $mode !== 'r' && $mode !== 'rb') {
unset($this->namesCache[$path]);
}
return $result;
}
/**
* get the mimetype for a file or folder
* The mimetype for a folder is required to be "httpd/unix-directory"
*
* @param string $path
* @return string
*/
public function getMimeType($path) {
return $this->storage->getMimeType($this->findPathToUse($path));
}
/**
* see http://php.net/manual/en/function.hash.php
*
* @param string $type
* @param string $path
* @param bool $raw
* @return string
*/
public function hash($type, $path, $raw = false) {
return $this->storage->hash($type, $this->findPathToUse($path), $raw);
}
/**
* see http://php.net/manual/en/function.free_space.php
*
* @param string $path
* @return int
*/
public function free_space($path) {
return $this->storage->free_space($this->findPathToUse($path));
}
/**
* search for occurrences of $query in file names
*
* @param string $query
* @return array
*/
public function search($query) {
'@phan-var \OC\Files\Storage\Common $this->storage';
return $this->storage->search($query);
}
/**
* see http://php.net/manual/en/function.touch.php
* If the backend does not support the operation, false should be returned
*
* @param string $path
* @param int $mtime
* @return bool
*/
public function touch($path, $mtime = null) {
return $this->storage->touch($this->findPathToUse($path), $mtime);
}
/**
* get the path to a local version of the file.
* The local version of the file can be temporary and doesn't have to be persistent across requests
*
* @param string $path
* @return string
*/
public function getLocalFile($path) {
return $this->storage->getLocalFile($this->findPathToUse($path));
}
/**
* check if a file or folder has been updated since $time
*
* @param string $path
* @param int $time
* @return bool
*
* hasUpdated for folders should return at least true if a file inside the folder is add, removed or renamed.
* returning true for other changes in the folder is optional
*/
public function hasUpdated($path, $time) {
return $this->storage->hasUpdated($this->findPathToUse($path), $time);
}
/**
* get a cache instance for the storage
*
* @param string $path
* @param \OC\Files\Storage\Storage (optional) the storage to pass to the cache
* @return \OC\Files\Cache\Cache
*/
public function getCache($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return $this->storage->getCache($this->findPathToUse($path), $storage);
}
/**
* get a scanner instance for the storage
*
* @param string $path
* @param \OC\Files\Storage\Storage (optional) the storage to pass to the scanner
* @return \OC\Files\Cache\Scanner
*/
public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return $this->storage->getScanner($this->findPathToUse($path), $storage);
}
/**
* get the ETag for a file or folder
*
* @param string $path
* @return string
*/
public function getETag($path) {
return $this->storage->getETag($this->findPathToUse($path));
}
/**
* @param \OCP\Files\Storage $sourceStorage
* @param string $sourceInternalPath
* @param string $targetInternalPath
* @return bool
*/
public function copyFromStorage(\OCP\Files\Storage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
if ($sourceStorage === $this) {
return $this->copy($sourceInternalPath, $this->findPathToUse($targetInternalPath));
}
$result = $this->storage->copyFromStorage($sourceStorage, $sourceInternalPath, $this->findPathToUse($targetInternalPath));
if ($result) {
unset($this->namesCache[$targetInternalPath]);
}
return $result;
}
/**
* @param \OCP\Files\Storage $sourceStorage
* @param string $sourceInternalPath
* @param string $targetInternalPath
* @return bool
*/
public function moveFromStorage(\OCP\Files\Storage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
if ($sourceStorage === $this) {
$result = $this->rename($sourceInternalPath, $this->findPathToUse($targetInternalPath));
if ($result) {
unset($this->namesCache[$sourceInternalPath], $this->namesCache[$targetInternalPath]);
}
return $result;
}
$result = $this->storage->moveFromStorage($sourceStorage, $sourceInternalPath, $this->findPathToUse($targetInternalPath));
if ($result) {
unset($this->namesCache[$sourceInternalPath], $this->namesCache[$targetInternalPath]);
}
return $result;
}
/**
* @param string $path
* @return array
*/
public function getMetaData($path) {
return $this->storage->getMetaData($this->findPathToUse($path));
}
}