nextcloud/lib/private/files/mapper.php

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<?php
namespace OC\Files;
/**
* class Mapper is responsible to translate logical paths to physical paths and reverse
*/
class Mapper
{
private $unchangedPhysicalRoot;
public function __construct($rootDir) {
$this->unchangedPhysicalRoot = $rootDir;
}
/**
* @param string $logicPath
* @param bool $create indicates if the generated physical name shall be stored in the database or not
* @return string the physical path
*/
public function logicToPhysical($logicPath, $create) {
$physicalPath = $this->resolveLogicPath($logicPath);
if ($physicalPath !== null) {
return $physicalPath;
}
return $this->create($logicPath, $create);
}
/**
* @param string $physicalPath
* @return string
*/
public function physicalToLogic($physicalPath) {
$logicPath = $this->resolvePhysicalPath($physicalPath);
if ($logicPath !== null) {
return $logicPath;
}
$this->insert($physicalPath, $physicalPath);
return $physicalPath;
}
/**
* @param string $path
* @param bool $isLogicPath indicates if $path is logical or physical
* @param boolean $recursive
* @return void
*/
public function removePath($path, $isLogicPath, $recursive) {
if ($recursive) {
$path=$path.'%';
}
if ($isLogicPath) {
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\OC_DB::executeAudited('DELETE FROM `*PREFIX*file_map` WHERE `logic_path` LIKE ?', array($path));
} else {
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\OC_DB::executeAudited('DELETE FROM `*PREFIX*file_map` WHERE `physic_path` LIKE ?', array($path));
}
}
/**
* @param string $path1
* @param string $path2
* @throws \Exception
*/
public function copy($path1, $path2)
{
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$path1 = $this->resolveRelativePath($path1);
$path2 = $this->resolveRelativePath($path2);
$physicPath1 = $this->logicToPhysical($path1, true);
$physicPath2 = $this->logicToPhysical($path2, true);
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$sql = 'SELECT * FROM `*PREFIX*file_map` WHERE `logic_path` LIKE ?';
$result = \OC_DB::executeAudited($sql, array($path1.'%'));
$updateQuery = \OC_DB::prepare('UPDATE `*PREFIX*file_map`'
.' SET `logic_path` = ?'
.' , `logic_path_hash` = ?'
.' , `physic_path` = ?'
.' , `physic_path_hash` = ?'
.' WHERE `logic_path` = ?');
while( $row = $result->fetchRow()) {
$currentLogic = $row['logic_path'];
$currentPhysic = $row['physic_path'];
$newLogic = $path2.$this->stripRootFolder($currentLogic, $path1);
$newPhysic = $physicPath2.$this->stripRootFolder($currentPhysic, $physicPath1);
if ($path1 !== $currentLogic) {
try {
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\OC_DB::executeAudited($updateQuery, array($newLogic, md5($newLogic), $newPhysic, md5($newPhysic),
$currentLogic));
} catch (\Exception $e) {
error_log('Mapper::Copy failed '.$currentLogic.' -> '.$newLogic.'\n'.$e);
throw $e;
}
}
}
}
/**
* @param string $path
* @param string $root
* @return false|string
*/
public function stripRootFolder($path, $root) {
if (strpos($path, $root) !== 0) {
// throw exception ???
return false;
}
if (strlen($path) > strlen($root)) {
return substr($path, strlen($root));
}
return '';
}
/**
* @param string $logicPath
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* @return null
* @throws \OC\DatabaseException
*/
private function resolveLogicPath($logicPath) {
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$logicPath = $this->resolveRelativePath($logicPath);
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$sql = 'SELECT * FROM `*PREFIX*file_map` WHERE `logic_path_hash` = ?';
$result = \OC_DB::executeAudited($sql, array(md5($logicPath)));
$result = $result->fetchRow();
if ($result === false) {
return null;
}
return $result['physic_path'];
}
private function resolvePhysicalPath($physicalPath) {
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$physicalPath = $this->resolveRelativePath($physicalPath);
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$sql = \OC_DB::prepare('SELECT * FROM `*PREFIX*file_map` WHERE `physic_path_hash` = ?');
$result = \OC_DB::executeAudited($sql, array(md5($physicalPath)));
$result = $result->fetchRow();
return $result['logic_path'];
}
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private function resolveRelativePath($path) {
$explodedPath = explode('/', $path);
$pathArray = array();
foreach ($explodedPath as $pathElement) {
if (empty($pathElement) || ($pathElement == '.')) {
continue;
} elseif ($pathElement == '..') {
if (count($pathArray) == 0) {
return false;
}
array_pop($pathArray);
} else {
array_push($pathArray, $pathElement);
}
}
if (substr($path, 0, 1) == '/') {
$path = '/';
} else {
$path = '';
}
return $path.implode('/', $pathArray);
}
/**
* @param string $logicPath
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* @param bool $store
* @return string
*/
private function create($logicPath, $store) {
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$logicPath = $this->resolveRelativePath($logicPath);
$index = 0;
// create the slugified path
$physicalPath = $this->slugifyPath($logicPath);
// detect duplicates
while ($this->resolvePhysicalPath($physicalPath) !== null) {
$physicalPath = $this->slugifyPath($logicPath, $index++);
}
// insert the new path mapping if requested
if ($store) {
$this->insert($logicPath, $physicalPath);
}
return $physicalPath;
}
private function insert($logicPath, $physicalPath) {
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$sql = 'INSERT INTO `*PREFIX*file_map` (`logic_path`, `physic_path`, `logic_path_hash`, `physic_path_hash`)
VALUES (?, ?, ?, ?)';
\OC_DB::executeAudited($sql, array($logicPath, $physicalPath, md5($logicPath), md5($physicalPath)));
}
/**
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* @param string $path
* @param int $index
* @return string
*/
public function slugifyPath($path, $index = null) {
$path = $this->stripRootFolder($path, $this->unchangedPhysicalRoot);
$pathElements = explode('/', $path);
$sluggedElements = array();
foreach ($pathElements as $pathElement) {
// remove empty elements
if (empty($pathElement)) {
continue;
}
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$sluggedElements[] = $this->slugify($pathElement);
}
// apply index to file name
if ($index !== null) {
$last = array_pop($sluggedElements);
// if filename contains periods - add index number before last period
if (preg_match('~\.[^\.]+$~i', $last, $extension)) {
array_push($sluggedElements, substr($last, 0, -(strlen($extension[0]))) . '-' . $index . $extension[0]);
} else {
// if filename doesn't contain periods add index ofter the last char
array_push($sluggedElements, $last . '-' . $index);
}
}
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$sluggedPath = $this->unchangedPhysicalRoot.implode('/', $sluggedElements);
return $this->resolveRelativePath($sluggedPath);
}
/**
* Modifies a string to remove all non ASCII characters and spaces.
*
* @param string $text
* @return string
*/
private function slugify($text) {
$originalText = $text;
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// replace non letter or digits or dots by -
$text = preg_replace('~[^\\pL\d\.]+~u', '-', $text);
// trim
$text = trim($text, '-');
// transliterate
if (function_exists('iconv')) {
$text = iconv('utf-8', 'us-ascii//TRANSLIT//IGNORE', $text);
}
// lowercase
$text = strtolower($text);
// remove unwanted characters
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$text = preg_replace('~[^-\w\.]+~', '', $text);
// trim ending dots (for security reasons and win compatibility)
$text = preg_replace('~\.+$~', '', $text);
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if (empty($text) || \OC\Files\Filesystem::isFileBlacklisted($text)) {
/**
* Item slug would be empty. Previously we used uniqid() here.
* However this means that the behaviour is not reproducible, so
* when uploading files into a "empty" folder, the folders name is
* different.
*
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* The other case is, that the slugified name would be a blacklisted
* filename. In this case we just use the same workaround by
* returning the secure md5 hash of the original name.
*
*
* If there would be a md5() hash collision, the deduplicate check
* will spot this and append an index later, so this should not be
* a problem.
*/
return md5($originalText);
}
return $text;
}
}