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Diffstat (limited to 'phpBB/phpbb/filesystem/filesystem.php')
| -rw-r--r-- | phpBB/phpbb/filesystem/filesystem.php | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/phpBB/phpbb/filesystem/filesystem.php b/phpBB/phpbb/filesystem/filesystem.php new file mode 100644 index 0000000000..2112882d1d --- /dev/null +++ b/phpBB/phpbb/filesystem/filesystem.php @@ -0,0 +1,916 @@ +<?php +/** + * + * This file is part of the phpBB Forum Software package. + * + * @copyright (c) phpBB Limited <https://www.phpbb.com> + * @license GNU General Public License, version 2 (GPL-2.0) + * + * For full copyright and license information, please see + * the docs/CREDITS.txt file. + * + */ + +namespace phpbb\filesystem; + +use phpbb\filesystem\exception\filesystem_exception; + +/** + * A class with various functions that are related to paths, files and the filesystem + */ +class filesystem implements filesystem_interface +{ + /** + * Store some information about file ownership for phpBB's chmod function + * + * @var array + */ + protected $chmod_info; + + /** + * Stores current working directory + * + * @var string|bool current working directory or false if it cannot be recovered + */ + protected $working_directory; + + /** + * Symfony's Filesystem component + * + * @var \Symfony\Component\Filesystem\Filesystem + */ + protected $symfony_filesystem; + + /** + * Constructor + */ + public function __construct() + { + $this->chmod_info = array(); + $this->symfony_filesystem = new \Symfony\Component\Filesystem\Filesystem(); + $this->working_directory = null; + } + + /** + * {@inheritdoc} + */ + public function chgrp($files, $group, $recursive = false) + { + try + { + $this->symfony_filesystem->chgrp($files, $group, $recursive); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + // Try to recover filename + // By the time this is written that is at the end of the message + $error = trim($e->getMessage()); + $file = substr($error, strrpos($error, ' ')); + + throw new filesystem_exception('CANNOT_CHANGE_FILE_GROUP', $file, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function chmod($files, $perms = null, $recursive = false, $force_chmod_link = false) + { + if (is_null($perms)) + { + // Default to read permission for compatibility reasons + $perms = self::CHMOD_READ; + } + + // Check if we got a permission flag + if ($perms > self::CHMOD_ALL) + { + $file_perm = $perms; + + // Extract permissions + //$owner = ($file_perm >> 6) & 7; // This will be ignored + $group = ($file_perm >> 3) & 7; + $other = ($file_perm >> 0) & 7; + + // Does any permissions provided? if so we add execute bit for directories + $group = ($group !== 0) ? ($group | self::CHMOD_EXECUTE) : $group; + $other = ($other !== 0) ? ($other | self::CHMOD_EXECUTE) : $other; + + // Compute directory permissions + $dir_perm = (self::CHMOD_ALL << 6) + ($group << 3) + ($other << 3); + } + else + { + // Add execute bit to owner if execute bit is among perms + $owner_perm = (self::CHMOD_READ | self::CHMOD_WRITE) | ($perms & self::CHMOD_EXECUTE); + $file_perm = ($owner_perm << 6) + ($perms << 3) + ($perms << 0); + + // Compute directory permissions + $perm = ($perms !== 0) ? ($perms | self::CHMOD_EXECUTE) : $perms; + $dir_perm = (($owner_perm | self::CHMOD_EXECUTE) << 6) + ($perm << 3) + ($perm << 0); + } + + // Symfony's filesystem component does not support extra execution flags on directories + // so we need to implement it again + foreach ($this->to_iterator($files) as $file) + { + if ($recursive && is_dir($file) && !is_link($file)) + { + $this->chmod(new \FilesystemIterator($file), $perms, true); + } + + // Don't chmod links as mostly those require 0777 and that cannot be changed + if (is_dir($file) || (is_link($file) && $force_chmod_link)) + { + if (true !== @chmod($file, $dir_perm)) + { + throw new filesystem_exception('CANNOT_CHANGE_FILE_PERMISSIONS', $file, array()); + } + } + else if (is_file($file)) + { + if (true !== @chmod($file, $file_perm)) + { + throw new filesystem_exception('CANNOT_CHANGE_FILE_PERMISSIONS', $file, array()); + } + } + } + } + + /** + * {@inheritdoc} + */ + public function chown($files, $user, $recursive = false) + { + try + { + $this->symfony_filesystem->chown($files, $user, $recursive); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + // Try to recover filename + // By the time this is written that is at the end of the message + $error = trim($e->getMessage()); + $file = substr($error, strrpos($error, ' ')); + + throw new filesystem_exception('CANNOT_CHANGE_FILE_GROUP', $file, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function clean_path($path) + { + $exploded = explode('/', $path); + $filtered = array(); + foreach ($exploded as $part) + { + if ($part === '.' && !empty($filtered)) + { + continue; + } + + if ($part === '..' && !empty($filtered) && $filtered[sizeof($filtered) - 1] !== '.' && $filtered[sizeof($filtered) - 1] !== '..') + { + array_pop($filtered); + } + else + { + $filtered[] = $part; + } + } + $path = implode('/', $filtered); + return $path; + } + + /** + * {@inheritdoc} + */ + public function copy($origin_file, $target_file, $override = false) + { + try + { + $this->symfony_filesystem->copy($origin_file, $target_file, $override); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + throw new filesystem_exception('CANNOT_COPY_FILES', '', array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function dump_file($filename, $content) + { + try + { + $this->symfony_filesystem->dumpFile($filename, $content); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + throw new filesystem_exception('CANNOT_DUMP_FILE', $filename, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function exists($files) + { + return $this->symfony_filesystem->exists($files); + } + + /** + * {@inheritdoc} + */ + public function is_absolute_path($path) + { + return (isset($path[0]) && $path[0] === '/' || preg_match('#^[a-z]:[/\\\]#i', $path)) ? true : false; + } + + /** + * {@inheritdoc} + */ + public function is_readable($files, $recursive = false) + { + foreach ($this->to_iterator($files) as $file) + { + if ($recursive && is_dir($file) && !is_link($file)) + { + if (!$this->is_readable(new \FilesystemIterator($file), true)) + { + return false; + } + } + + if (!is_readable($file)) + { + return false; + } + } + + return true; + } + + /** + * {@inheritdoc} + */ + public function is_writable($files, $recursive = false) + { + if (defined('PHP_WINDOWS_VERSION_MAJOR') || !function_exists('is_writable')) + { + foreach ($this->to_iterator($files) as $file) + { + if ($recursive && is_dir($file) && !is_link($file)) + { + if (!$this->is_writable(new \FilesystemIterator($file), true)) + { + return false; + } + } + + if (!$this->phpbb_is_writable($file)) + { + return false; + } + } + } + else + { + // use built in is_writable + foreach ($this->to_iterator($files) as $file) + { + if ($recursive && is_dir($file) && !is_link($file)) + { + if (!$this->is_writable(new \FilesystemIterator($file), true)) + { + return false; + } + } + + if (!is_writable($file)) + { + return false; + } + } + } + + return true; + } + + /** + * {@inheritdoc} + */ + public function make_path_relative($end_path, $start_path) + { + return $this->symfony_filesystem->makePathRelative($end_path, $start_path); + } + + /** + * {@inheritdoc} + */ + public function mirror($origin_dir, $target_dir, \Traversable $iterator = null, $options = array()) + { + try + { + $this->symfony_filesystem->mirror($origin_dir, $target_dir, $iterator, $options); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + $msg = $e->getMessage(); + $filename = substr($msg, strpos($msg, '"'), strrpos($msg, '"')); + + throw new filesystem_exception('CANNOT_MIRROR_DIRECTORY', $filename, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function mkdir($dirs, $mode = 0777) + { + try + { + $this->symfony_filesystem->mkdir($dirs, $mode); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + $msg = $e->getMessage(); + $filename = substr($msg, strpos($msg, '"'), strrpos($msg, '"')); + + throw new filesystem_exception('CANNOT_CREATE_DIRECTORY', $filename, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function phpbb_chmod($files, $perms = null, $recursive = false, $force_chmod_link = false) + { + if (is_null($perms)) + { + // Default to read permission for compatibility reasons + $perms = self::CHMOD_READ; + } + + if (empty($this->chmod_info)) + { + if (!function_exists('fileowner') || !function_exists('filegroup')) + { + $this->chmod_info['process'] = false; + } + else + { + $common_php_owner = @fileowner(__FILE__); + $common_php_group = @filegroup(__FILE__); + + // And the owner and the groups PHP is running under. + $php_uid = (function_exists('posic_getuid')) ? @posix_getuid() : false; + $php_gids = (function_exists('posix_getgroups')) ? @posix_getgroups() : false; + + // If we are unable to get owner/group, then do not try to set them by guessing + if (!$php_uid || empty($php_gids) || !$common_php_owner || !$common_php_group) + { + $this->chmod_info['process'] = false; + } + else + { + $this->chmod_info = array( + 'process' => true, + 'common_owner' => $common_php_owner, + 'common_group' => $common_php_group, + 'php_uid' => $php_uid, + 'php_gids' => $php_gids, + ); + } + } + } + + if ($this->chmod_info['process']) + { + try + { + foreach ($this->to_iterator($files) as $file) + { + $file_uid = @fileowner($file); + $file_gid = @filegroup($file); + + // Change owner + if ($file_uid !== $this->chmod_info['common_owner']) + { + $this->chown($file, $this->chmod_info['common_owner'], $recursive); + } + + // Change group + if ($file_gid !== $this->chmod_info['common_group']) + { + $this->chgrp($file, $this->chmod_info['common_group'], $recursive); + } + + clearstatcache(); + $file_uid = @fileowner($file); + $file_gid = @filegroup($file); + } + } + catch (filesystem_exception $e) + { + $this->chmod_info['process'] = false; + } + } + + // Still able to process? + if ($this->chmod_info['process']) + { + if ($file_uid === $this->chmod_info['php_uid']) + { + $php = 'owner'; + } + else if (in_array($file_gid, $this->chmod_info['php_gids'])) + { + $php = 'group'; + } + else + { + // Since we are setting the everyone bit anyway, no need to do expensive operations + $this->chmod_info['process'] = false; + } + } + + // We are not able to determine or change something + if (!$this->chmod_info['process']) + { + $php = 'other'; + } + + switch ($php) + { + case 'owner': + try + { + $this->chmod($files, $perms, $recursive, $force_chmod_link); + clearstatcache(); + if ($this->is_readable($files) && $this->is_writable($files)) + { + break; + } + } + catch (filesystem_exception $e) + { + // Do nothing + } + case 'group': + try + { + $this->chmod($files, $perms, $recursive, $force_chmod_link); + clearstatcache(); + if ((!($perms & self::CHMOD_READ) || $this->is_readable($files, $recursive)) && (!($perms & self::CHMOD_WRITE) || $this->is_writable($files, $recursive))) + { + break; + } + } + catch (filesystem_exception $e) + { + // Do nothing + } + case 'other': + default: + $this->chmod($files, $perms, $recursive, $force_chmod_link); + break; + } + } + + /** + * {@inheritdoc} + */ + public function realpath($path) + { + if (!function_exists('realpath')) + { + return $this->phpbb_own_realpath($path); + } + + $realpath = realpath($path); + + // Strangely there are provider not disabling realpath but returning strange values. :o + // We at least try to cope with them. + if ((!$this->is_absolute_path($path) && $realpath === $path) || $realpath === false) + { + return $this->phpbb_own_realpath($path); + } + + // Check for DIRECTORY_SEPARATOR at the end (and remove it!) + if (substr($realpath, -1) === DIRECTORY_SEPARATOR) + { + $realpath = substr($realpath, 0, -1); + } + + return $realpath; + } + + /** + * {@inheritdoc} + */ + public function remove($files) + { + try + { + $this->symfony_filesystem->remove($files); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + // Try to recover filename + // By the time this is written that is at the end of the message + $error = trim($e->getMessage()); + $file = substr($error, strrpos($error, ' ')); + + throw new filesystem_exception('CANNOT_DELETE_FILES', $file, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function rename($origin, $target, $overwrite = false) + { + try + { + $this->symfony_filesystem->rename($origin, $target, $overwrite); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + $msg = $e->getMessage(); + $filename = substr($msg, strpos($msg, '"'), strrpos($msg, '"')); + + throw new filesystem_exception('CANNOT_RENAME_FILE', $filename, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function symlink($origin_dir, $target_dir, $copy_on_windows = false) + { + try + { + $this->symfony_filesystem->symlink($origin_dir, $target_dir, $copy_on_windows); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + throw new filesystem_exception('CANNOT_CREATE_SYMLINK', $origin_dir, array(), $e); + } + } + + /** + * {@inheritdoc} + */ + public function touch($files, $time = null, $access_time = null) + { + try + { + $this->symfony_filesystem->touch($files, $time, $access_time); + } + catch (\Symfony\Component\Filesystem\Exception\IOException $e) + { + // Try to recover filename + // By the time this is written that is at the end of the message + $error = trim($e->getMessage()); + $file = substr($error, strrpos($error, ' ')); + + throw new filesystem_exception('CANNOT_TOUCH_FILES', $file, array(), $e); + } + } + + /** + * phpBB's implementation of is_writable + * + * @todo Investigate if is_writable is still buggy + * + * @param string $file file/directory to check if writable + * + * @return bool true if the given path is writable + */ + protected function phpbb_is_writable($file) + { + if (file_exists($file)) + { + // Canonicalise path to absolute path + $file = $this->realpath($file); + + if (is_dir($file)) + { + // Test directory by creating a file inside the directory + $result = @tempnam($file, 'i_w'); + + if (is_string($result) && file_exists($result)) + { + unlink($result); + + // Ensure the file is actually in the directory (returned realpathed) + return (strpos($result, $file) === 0) ? true : false; + } + } + else + { + $handle = @fopen($file, 'c'); + + if (is_resource($handle)) + { + fclose($handle); + return true; + } + } + } + else + { + // file does not exist test if we can write to the directory + $dir = dirname($file); + + if (file_exists($dir) && is_dir($dir) && $this->phpbb_is_writable($dir)) + { + return true; + } + } + + return false; + } + + /** + * Try to resolve real path when PHP's realpath failes to do so + * + * @param string $path + * @return bool|string + */ + protected function phpbb_own_realpath($path) + { + // Replace all directory separators with '/' + $path = str_replace(DIRECTORY_SEPARATOR, '/', $path); + + $is_absolute_path = false; + $path_prefix = ''; + + if ($this->is_absolute_path($path)) + { + $is_absolute_path = true; + } + else + { + // Resolve working directory and store it + if (is_null($this->working_directory)) + { + if (function_exists('getcwd')) + { + $this->working_directory = str_replace(DIRECTORY_SEPARATOR, '/', getcwd()); + } + + // + // From this point on we really just guessing + // If chdir were called we screwed + // + else if (function_exists('debug_backtrace')) + { + $call_stack = debug_backtrace(0); + $this->working_directory = str_replace(DIRECTORY_SEPARATOR, '/', dirname($call_stack[sizeof($call_stack) - 1]['file'])); + } + else + { + // + // Assuming that the working directory is phpBB root + // we could use this as a fallback, when phpBB will use controllers + // everywhere this will be a safe assumption + // + //$dir_parts = explode(DIRECTORY_SEPARATOR, __DIR__); + //$namespace_parts = explode('\\', trim(__NAMESPACE__, '\\')); + + //$namespace_part_count = sizeof($namespace_parts); + + // Check if we still loading from root + //if (array_slice($dir_parts, -$namespace_part_count) === $namespace_parts) + //{ + // $this->working_directory = implode('/', array_slice($dir_parts, 0, -$namespace_part_count)); + //} + //else + //{ + // $this->working_directory = false; + //} + + $this->working_directory = false; + } + } + + if ($this->working_directory !== false) + { + $is_absolute_path = true; + $path = $this->working_directory . '/' . $path; + } + } + + if ($is_absolute_path) + { + if (defined('PHP_WINDOWS_VERSION_MAJOR')) + { + $path_prefix = $path[0] . ':'; + $path = substr($path, 2); + } + else + { + $path_prefix = ''; + } + } + + $resolved_path = $this->resolve_path($path, $path_prefix, $is_absolute_path); + if ($resolved_path === false) + { + return false; + } + + if (!@file_exists($resolved_path) || (!@is_dir($resolved_path . '/') && !is_file($resolved_path))) + { + return false; + } + + // Return OS specific directory separators + $resolved = str_replace('/', DIRECTORY_SEPARATOR, $resolved_path); + + // Check for DIRECTORY_SEPARATOR at the end (and remove it!) + if (substr($resolved, -1) === DIRECTORY_SEPARATOR) + { + return substr($resolved, 0, -1); + } + + return $resolved; + } + + /** + * Convert file(s) to \Traversable object + * + * This is the same function as Symfony's toIterator, but that is private + * so we cannot use it. + * + * @param string|array|\Traversable $files filename/list of filenames + * @return \Traversable + */ + protected function to_iterator($files) + { + if (!$files instanceof \Traversable) + { + $files = new \ArrayObject(is_array($files) ? $files : array($files)); + } + + return $files; + } + + /** + * Try to resolve symlinks in path + * + * @param string $path The path to resolve + * @param string $prefix The path prefix (on windows the drive letter) + * @param bool $absolute Whether or not the path is absolute + * @param bool $return_array Whether or not to return path parts + * + * @return string|array|bool returns the resolved path or an array of parts of the path if $return_array is true + * or false if path cannot be resolved + */ + protected function resolve_path($path, $prefix = '', $absolute = false, $return_array = false) + { + if ($return_array) + { + $path = str_replace(DIRECTORY_SEPARATOR, '/', $path); + } + + trim ($path, '/'); + $path_parts = explode('/', $path); + $resolved = array(); + $resolved_path = $prefix; + $file_found = false; + + foreach ($path_parts as $path_part) + { + if ($file_found) + { + return false; + } + + if (empty($path_part) || ($path_part === '.' && ($absolute || !empty($resolved)))) + { + continue; + } + else if ($absolute && $path_part === '..') + { + if (empty($resolved)) + { + // No directories above root + return false; + } + + array_pop($resolved); + $resolved_path = false; + } + else if ($path_part === '..' && !empty($resolved) && !in_array($resolved[sizeof($resolved) - 1], array('.', '..'))) + { + array_pop($resolved); + $resolved_path = false; + } + else + { + if ($resolved_path === false) + { + if (empty($resolved)) + { + $resolved_path = ($absolute) ? $prefix . '/' . $path_part : $path_part; + } + else + { + $tmp_array = $resolved; + if ($absolute) + { + array_unshift($tmp_array, $prefix); + } + + $resolved_path = implode('/', $tmp_array); + } + } + + $current_path = $resolved_path . '/' . $path_part; + + // Resolve symlinks + if (is_link($current_path)) + { + if (!function_exists('readlink')) + { + return false; + } + + $link = readlink($current_path); + + // Is link has an absolute path in it? + if ($this->is_absolute_path($link)) + { + if (defined('PHP_WINDOWS_VERSION_MAJOR')) + { + $prefix = $link[0] . ':'; + $link = substr($link, 2); + } + else + { + $prefix = ''; + } + + $resolved = $this->resolve_path($link, $prefix, true, true); + $absolute = true; + } + else + { + $resolved = $this->resolve_path($resolved_path . '/' . $link, $prefix, $absolute, true); + } + + if (!$resolved) + { + return false; + } + + $resolved_path = false; + } + else if (is_dir($current_path . '/')) + { + $resolved[] = $path_part; + $resolved_path = $current_path; + } + else if (is_file($current_path)) + { + $resolved[] = $path_part; + $resolved_path = $current_path; + $file_found = true; + } + else + { + return false; + } + } + } + + // If at the end of the path there were a .. or . + // we need to build the path again. + // Only doing this when a string is expected in return + if ($resolved_path === false && $return_array === false) + { + if (empty($resolved)) + { + $resolved_path = ($absolute) ? $prefix . '/' : './'; + } + else + { + $tmp_array = $resolved; + if ($absolute) + { + array_unshift($tmp_array, $prefix); + } + + $resolved_path = implode('/', $tmp_array); + } + } + + return ($return_array) ? $resolved : $resolved_path; + } +} |