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<?php
/**
* Part of the Joomla Framework Filesystem Package
*
* @copyright Copyright (C) 2005 - 2021 Open Source Matters, Inc. All
rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
namespace Joomla\Filesystem;
use Joomla\Filesystem\Exception\FilesystemException;
/**
* A Path handling class
*
* @since 1.0
*/
class Path
{
/**
* Checks if a path's permissions can be changed.
*
* @param string $path Path to check.
*
* @return boolean True if path can have mode changed.
*
* @since 1.0
*/
public static function canChmod($path)
{
if (!file_exists($path)) {
return false;
}
$perms = @fileperms($path);
if ($perms !== false) {
if (@chmod($path, $perms ^ 0001)) {
@chmod($path, $perms);
return true;
}
}
return false;
}
/**
* Chmods files and directories recursively to given permissions.
*
* @param string $path Root path to begin changing mode
[without trailing slash].
* @param string $filemode Octal representation of the value to
change file mode to [null = no change].
* @param string $foldermode Octal representation of the value to
change folder mode to [null = no change].
*
* @return boolean True if successful [one fail means the whole
operation failed].
*
* @since 1.0
*/
public static function setPermissions($path, $filemode =
'0644', $foldermode = '0755')
{
// Initialise return value
$ret = true;
if (is_dir($path)) {
$dh = @opendir($path);
if ($dh) {
while ($file = readdir($dh)) {
if ($file != '.' && $file !=
'..') {
$fullpath = $path . '/' . $file;
if (is_dir($fullpath)) {
if (!static::setPermissions($fullpath,
$filemode, $foldermode)) {
$ret = false;
}
} else {
if (isset($filemode)) {
if (!static::canChmod($fullpath) || !@
chmod($fullpath, octdec($filemode))) {
$ret = false;
}
}
}
}
}
closedir($dh);
}
if (isset($foldermode)) {
if (!static::canChmod($path) || !@ chmod($path,
octdec($foldermode))) {
$ret = false;
}
}
} else {
if (isset($filemode)) {
if (!static::canChmod($path) || !@ chmod($path,
octdec($filemode))) {
$ret = false;
}
}
}
return $ret;
}
/**
* Get the permissions of the file/folder at a give path.
*
* @param string $path The path of a file/folder.
*
* @return string Filesystem permissions.
*
* @since 1.0
*/
public static function getPermissions($path)
{
$path = self::clean($path);
$mode = @ decoct(@ fileperms($path) & 0777);
if (\strlen($mode) < 3) {
return '---------';
}
$parsedMode = '';
for ($i = 0; $i < 3; $i++) {
// Read
$parsedMode .= ($mode[$i] & 04) ? 'r' :
'-';
// Write
$parsedMode .= ($mode[$i] & 02) ? 'w' :
'-';
// Execute
$parsedMode .= ($mode[$i] & 01) ? 'x' :
'-';
}
return $parsedMode;
}
/**
* Checks for snooping outside of the file system root.
*
* @param string $path A file system path to check.
* @param string $basePath The base path of the system
*
* @return string A cleaned version of the path or exit on error.
*
* @since 1.0
* @throws FilesystemException
*/
public static function check($path, $basePath = '')
{
if (strpos($path, '..') !== false) {
throw new FilesystemException(
sprintf(
'%s() - Use of relative paths not permitted',
__METHOD__
),
20
);
}
$path = static::clean($path);
// If a base path is defined then check the cleaned path is not
outside of root
if (($basePath != '') && strpos($path,
static::clean($basePath)) !== 0) {
throw new FilesystemException(
sprintf(
'%1$s() - Snooping out of bounds @ %2$s',
__METHOD__,
$path
),
20
);
}
return $path;
}
/**
* Function to strip additional / or \ in a path name.
*
* @param string $path The path to clean.
* @param string $ds Directory separator (optional).
*
* @return string The cleaned path.
*
* @since 1.0
* @throws \UnexpectedValueException If $path is not a string.
*/
public static function clean($path, $ds = \DIRECTORY_SEPARATOR)
{
if (!\is_string($path)) {
throw new \InvalidArgumentException('You must specify a
non-empty path to clean');
}
$stream = explode('://', $path, 2);
$scheme = '';
$path = $stream[0];
if (\count($stream) >= 2) {
$scheme = $stream[0] . '://';
$path = $stream[1];
}
$path = trim($path);
// Remove double slashes and backslashes and convert all slashes
and backslashes to DIRECTORY_SEPARATOR
// If dealing with a UNC path don't forget to prepend the path
with a backslash.
if (($ds == '\\') && ($path[0] == '\\')
&& ($path[1] == '\\')) {
$path = '\\' . preg_replace('#[/\\\\]+#',
$ds, $path);
} else {
$path = preg_replace('#[/\\\\]+#', $ds, $path);
}
return $scheme . $path;
}
/**
* Method to determine if script owns the path.
*
* @param string $path Path to check ownership.
*
* @return boolean True if the php script owns the path passed.
*
* @since 1.0
*/
public static function isOwner($path)
{
$tmp = md5(random_bytes(16));
$ssp = ini_get('session.save_path');
// Try to find a writable directory
$dir = is_writable('/tmp') ? '/tmp' : false;
$dir = !$dir && is_writable('.') ? '.'
: $dir;
$dir = !$dir && is_writable($ssp) ? $ssp : $dir;
if ($dir) {
$test = $dir . '/' . $tmp;
// Create the test file
$blank = '';
File::write($test, $blank, false);
// Test ownership
$return = fileowner($test) === fileowner($path);
// Delete the test file
File::delete($test);
return $return;
}
return false;
}
/**
* Searches the directory paths for a given file.
*
* @param mixed $paths A path string or array of path strings to
search in
* @param string $file The file name to look for.
*
* @return string|boolean The full path and file name for the target
file, or boolean false if the file is not found in any of the paths.
*
* @since 1.0
*/
public static function find($paths, $file)
{
// Force to array
if (!\is_array($paths) && !($paths instanceof \Iterator)) {
settype($paths, 'array');
}
// Start looping through the path set
foreach ($paths as $path) {
// Get the path to the file
$fullname = $path . '/' . $file;
// Is the path based on a stream?
if (strpos($path, '://') === false) {
// Not a stream, so do a realpath() to avoid directory
// traversal attempts on the local file system.
// Needed for substr() later
$path = realpath($path);
$fullname = realpath($fullname);
}
/*
* The substr() check added to make sure that the realpath()
* results in a directory registered so that
* non-registered directories are not accessible via directory
* traversal attempts.
*/
if (file_exists($fullname) && substr($fullname, 0,
\strlen($path)) == $path) {
return $fullname;
}
}
// Could not find the file in the set of paths
return false;
}
/**
* Resolves /./, /../ and multiple / in a string and returns the
resulting absolute path, inspired by Flysystem
* Removes trailing slashes
*
* @param string $path A path to resolve
*
* @return string The resolved path
*
* @since 1.6.0
*/
public static function resolve($path)
{
$path = static::clean($path);
// Save start character for absolute path
$startCharacter = ($path[0] === DIRECTORY_SEPARATOR) ?
DIRECTORY_SEPARATOR : '';
$parts = [];
foreach (explode(DIRECTORY_SEPARATOR, $path) as $part) {
switch ($part) {
case '':
case '.':
break;
case '..':
if (empty($parts)) {
throw new FilesystemException('Path is outside
of the defined root');
}
array_pop($parts);
break;
default:
$parts[] = $part;
break;
}
}
return $startCharacter . implode(DIRECTORY_SEPARATOR, $parts);
}
/**
* Remove all references to root directory path and the system tmp path
from a message
*
* @param string $message The message to be cleaned
* @param string $rootDirectory Optional root directory, defaults
to JPATH_ROOT
*
* @return string
* @since 2.0.1
*/
public static function removeRoot($message, $rootDirectory = null)
{
if (empty($rootDirectory)) {
$rootDirectory = JPATH_ROOT;
}
$makePattern = static function ($dir) {
return '~' . str_replace('~',
'\\~', preg_replace('~[/\\\\]+~', '.', $dir))
. '~';
};
$replacements = [
$makePattern(static::clean($rootDirectory)) =>
'[ROOT]',
$makePattern(sys_get_temp_dir()) =>
'[TMP]',
];
return preg_replace(array_keys($replacements),
array_values($replacements), $message);
}
}