forked from GNUsocial/gnu-social
590 lines
23 KiB
PHP
590 lines
23 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Filesystem;
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use Symfony\Component\Filesystem\Exception\IOException;
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use Symfony\Component\Filesystem\Exception\FileNotFoundException;
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/**
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* Provides basic utility to manipulate the file system.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Filesystem
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{
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/**
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* Copies a file.
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*
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* If the target file is older than the origin file, it's always overwritten.
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* If the target file is newer, it is overwritten only when the
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* $overwriteNewerFiles option is set to true.
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*
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* @param string $originFile The original filename
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* @param string $targetFile The target filename
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* @param bool $overwriteNewerFiles If true, target files newer than origin files are overwritten
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*
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* @throws FileNotFoundException When originFile doesn't exist
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* @throws IOException When copy fails
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*/
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public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
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{
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if (stream_is_local($originFile) && !is_file($originFile)) {
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throw new FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
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}
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$this->mkdir(dirname($targetFile));
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$doCopy = true;
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if (!$overwriteNewerFiles && null === parse_url($originFile, PHP_URL_HOST) && is_file($targetFile)) {
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$doCopy = filemtime($originFile) > filemtime($targetFile);
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}
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if ($doCopy) {
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// https://bugs.php.net/bug.php?id=64634
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if (false === $source = @fopen($originFile, 'r')) {
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throw new IOException(sprintf('Failed to copy "%s" to "%s" because source file could not be opened for reading.', $originFile, $targetFile), 0, null, $originFile);
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}
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// Stream context created to allow files overwrite when using FTP stream wrapper - disabled by default
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if (false === $target = @fopen($targetFile, 'w', null, stream_context_create(array('ftp' => array('overwrite' => true))))) {
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throw new IOException(sprintf('Failed to copy "%s" to "%s" because target file could not be opened for writing.', $originFile, $targetFile), 0, null, $originFile);
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}
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$bytesCopied = stream_copy_to_stream($source, $target);
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fclose($source);
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fclose($target);
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unset($source, $target);
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if (!is_file($targetFile)) {
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throw new IOException(sprintf('Failed to copy "%s" to "%s".', $originFile, $targetFile), 0, null, $originFile);
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}
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// Like `cp`, preserve executable permission bits
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@chmod($targetFile, fileperms($targetFile) | (fileperms($originFile) & 0111));
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if (stream_is_local($originFile) && $bytesCopied !== ($bytesOrigin = filesize($originFile))) {
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throw new IOException(sprintf('Failed to copy the whole content of "%s" to "%s" (%g of %g bytes copied).', $originFile, $targetFile, $bytesCopied, $bytesOrigin), 0, null, $originFile);
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}
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}
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}
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/**
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* Creates a directory recursively.
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*
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* @param string|array|\Traversable $dirs The directory path
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* @param int $mode The directory mode
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*
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* @throws IOException On any directory creation failure
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*/
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public function mkdir($dirs, $mode = 0777)
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{
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foreach ($this->toIterator($dirs) as $dir) {
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if (is_dir($dir)) {
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continue;
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}
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if (true !== @mkdir($dir, $mode, true)) {
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$error = error_get_last();
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if (!is_dir($dir)) {
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// The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
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if ($error) {
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throw new IOException(sprintf('Failed to create "%s": %s.', $dir, $error['message']), 0, null, $dir);
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}
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throw new IOException(sprintf('Failed to create "%s"', $dir), 0, null, $dir);
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}
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}
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}
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}
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/**
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* Checks the existence of files or directories.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to check
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*
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* @return bool true if the file exists, false otherwise
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*/
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public function exists($files)
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{
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foreach ($this->toIterator($files) as $file) {
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if ('\\' === DIRECTORY_SEPARATOR && strlen($file) > 258) {
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throw new IOException('Could not check if file exist because path length exceeds 258 characters.', 0, null, $file);
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}
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if (!file_exists($file)) {
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return false;
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}
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}
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return true;
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}
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/**
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* Sets access and modification time of file.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to create
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* @param int $time The touch time as a Unix timestamp
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* @param int $atime The access time as a Unix timestamp
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*
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* @throws IOException When touch fails
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*/
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public function touch($files, $time = null, $atime = null)
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{
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foreach ($this->toIterator($files) as $file) {
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$touch = $time ? @touch($file, $time, $atime) : @touch($file);
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if (true !== $touch) {
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throw new IOException(sprintf('Failed to touch "%s".', $file), 0, null, $file);
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}
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}
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}
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/**
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* Removes files or directories.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to remove
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*
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* @throws IOException When removal fails
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*/
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public function remove($files)
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{
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if ($files instanceof \Traversable) {
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$files = iterator_to_array($files, false);
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} elseif (!is_array($files)) {
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$files = array($files);
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}
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$files = array_reverse($files);
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foreach ($files as $file) {
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if (is_link($file)) {
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// See https://bugs.php.net/52176
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if (!@(unlink($file) || '\\' !== DIRECTORY_SEPARATOR || rmdir($file)) && file_exists($file)) {
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$error = error_get_last();
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throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, $error['message']));
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}
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} elseif (is_dir($file)) {
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$this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));
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if (!@rmdir($file) && file_exists($file)) {
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$error = error_get_last();
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throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, $error['message']));
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}
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} elseif (!@unlink($file) && file_exists($file)) {
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$error = error_get_last();
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throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, $error['message']));
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}
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}
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}
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/**
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* Change mode for an array of files or directories.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change mode
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* @param int $mode The new mode (octal)
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* @param int $umask The mode mask (octal)
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* @param bool $recursive Whether change the mod recursively or not
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*
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* @throws IOException When the change fail
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*/
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public function chmod($files, $mode, $umask = 0000, $recursive = false)
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{
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foreach ($this->toIterator($files) as $file) {
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if (true !== @chmod($file, $mode & ~$umask)) {
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throw new IOException(sprintf('Failed to chmod file "%s".', $file), 0, null, $file);
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}
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if ($recursive && is_dir($file) && !is_link($file)) {
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$this->chmod(new \FilesystemIterator($file), $mode, $umask, true);
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}
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}
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}
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/**
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* Change the owner of an array of files or directories.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change owner
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* @param string $user The new owner user name
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* @param bool $recursive Whether change the owner recursively or not
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*
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* @throws IOException When the change fail
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*/
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public function chown($files, $user, $recursive = false)
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{
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foreach ($this->toIterator($files) as $file) {
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if ($recursive && is_dir($file) && !is_link($file)) {
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$this->chown(new \FilesystemIterator($file), $user, true);
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}
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if (is_link($file) && function_exists('lchown')) {
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if (true !== @lchown($file, $user)) {
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throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
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}
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} else {
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if (true !== @chown($file, $user)) {
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throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
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}
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}
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}
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}
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/**
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* Change the group of an array of files or directories.
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*
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* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change group
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* @param string $group The group name
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* @param bool $recursive Whether change the group recursively or not
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*
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* @throws IOException When the change fail
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*/
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public function chgrp($files, $group, $recursive = false)
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{
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foreach ($this->toIterator($files) as $file) {
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if ($recursive && is_dir($file) && !is_link($file)) {
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$this->chgrp(new \FilesystemIterator($file), $group, true);
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}
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if (is_link($file) && function_exists('lchgrp')) {
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if (true !== @lchgrp($file, $group) || (defined('HHVM_VERSION') && !posix_getgrnam($group))) {
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throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
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}
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} else {
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if (true !== @chgrp($file, $group)) {
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throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
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}
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}
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}
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}
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/**
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* Renames a file or a directory.
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*
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* @param string $origin The origin filename or directory
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* @param string $target The new filename or directory
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* @param bool $overwrite Whether to overwrite the target if it already exists
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*
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* @throws IOException When target file or directory already exists
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* @throws IOException When origin cannot be renamed
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*/
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public function rename($origin, $target, $overwrite = false)
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{
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// we check that target does not exist
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if (!$overwrite && $this->isReadable($target)) {
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throw new IOException(sprintf('Cannot rename because the target "%s" already exists.', $target), 0, null, $target);
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}
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if (true !== @rename($origin, $target)) {
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throw new IOException(sprintf('Cannot rename "%s" to "%s".', $origin, $target), 0, null, $target);
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}
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}
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/**
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* Tells whether a file exists and is readable.
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*
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* @param string $filename Path to the file
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*
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* @throws IOException When windows path is longer than 258 characters
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*/
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private function isReadable($filename)
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{
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if ('\\' === DIRECTORY_SEPARATOR && strlen($filename) > 258) {
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throw new IOException('Could not check if file is readable because path length exceeds 258 characters.', 0, null, $filename);
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}
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return is_readable($filename);
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}
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/**
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* Creates a symbolic link or copy a directory.
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*
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* @param string $originDir The origin directory path
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* @param string $targetDir The symbolic link name
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* @param bool $copyOnWindows Whether to copy files if on Windows
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*
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* @throws IOException When symlink fails
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*/
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public function symlink($originDir, $targetDir, $copyOnWindows = false)
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{
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if ('\\' === DIRECTORY_SEPARATOR) {
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$originDir = strtr($originDir, '/', '\\');
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$targetDir = strtr($targetDir, '/', '\\');
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if ($copyOnWindows) {
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$this->mirror($originDir, $targetDir);
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return;
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}
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}
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$this->mkdir(dirname($targetDir));
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$ok = false;
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if (is_link($targetDir)) {
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if (readlink($targetDir) != $originDir) {
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$this->remove($targetDir);
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} else {
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$ok = true;
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}
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}
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if (!$ok && true !== @symlink($originDir, $targetDir)) {
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$report = error_get_last();
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if (is_array($report)) {
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if ('\\' === DIRECTORY_SEPARATOR && false !== strpos($report['message'], 'error code(1314)')) {
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throw new IOException('Unable to create symlink due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', 0, null, $targetDir);
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}
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}
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throw new IOException(sprintf('Failed to create symbolic link from "%s" to "%s".', $originDir, $targetDir), 0, null, $targetDir);
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}
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}
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/**
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* Given an existing path, convert it to a path relative to a given starting path.
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*
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* @param string $endPath Absolute path of target
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* @param string $startPath Absolute path where traversal begins
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*
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* @return string Path of target relative to starting path
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*/
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public function makePathRelative($endPath, $startPath)
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{
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// Normalize separators on Windows
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if ('\\' === DIRECTORY_SEPARATOR) {
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$endPath = str_replace('\\', '/', $endPath);
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$startPath = str_replace('\\', '/', $startPath);
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}
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// Split the paths into arrays
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$startPathArr = explode('/', trim($startPath, '/'));
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$endPathArr = explode('/', trim($endPath, '/'));
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// Find for which directory the common path stops
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$index = 0;
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while (isset($startPathArr[$index]) && isset($endPathArr[$index]) && $startPathArr[$index] === $endPathArr[$index]) {
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++$index;
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}
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// Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
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$depth = count($startPathArr) - $index;
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// When we need to traverse from the start, and we are starting from a root path, don't add '../'
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if ('/' === $startPath[0] && 0 === $index && 1 === $depth) {
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$traverser = '';
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} else {
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// Repeated "../" for each level need to reach the common path
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$traverser = str_repeat('../', $depth);
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}
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$endPathRemainder = implode('/', array_slice($endPathArr, $index));
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// Construct $endPath from traversing to the common path, then to the remaining $endPath
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$relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');
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return '' === $relativePath ? './' : $relativePath;
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}
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/**
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* Mirrors a directory to another.
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*
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* @param string $originDir The origin directory
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* @param string $targetDir The target directory
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* @param \Traversable $iterator A Traversable instance
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* @param array $options An array of boolean options
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* Valid options are:
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* - $options['override'] Whether to override an existing file on copy or not (see copy())
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* - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink())
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* - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
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*
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* @throws IOException When file type is unknown
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*/
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public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = array())
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{
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$targetDir = rtrim($targetDir, '/\\');
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$originDir = rtrim($originDir, '/\\');
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// Iterate in destination folder to remove obsolete entries
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if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
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$deleteIterator = $iterator;
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if (null === $deleteIterator) {
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$flags = \FilesystemIterator::SKIP_DOTS;
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$deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
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}
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foreach ($deleteIterator as $file) {
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$origin = str_replace($targetDir, $originDir, $file->getPathname());
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if (!$this->exists($origin)) {
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$this->remove($file);
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}
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}
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}
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$copyOnWindows = false;
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if (isset($options['copy_on_windows'])) {
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$copyOnWindows = $options['copy_on_windows'];
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}
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if (null === $iterator) {
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$flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
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$iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
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}
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if ($this->exists($originDir)) {
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$this->mkdir($targetDir);
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}
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foreach ($iterator as $file) {
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$target = str_replace($originDir, $targetDir, $file->getPathname());
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if ($copyOnWindows) {
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if (is_file($file)) {
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$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
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} elseif (is_dir($file)) {
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$this->mkdir($target);
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} else {
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throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
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}
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} else {
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if (is_link($file)) {
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$this->symlink($file->getLinkTarget(), $target);
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} elseif (is_dir($file)) {
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$this->mkdir($target);
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} elseif (is_file($file)) {
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$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
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} else {
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throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
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}
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}
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}
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}
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/**
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* Returns whether the file path is an absolute path.
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*
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* @param string $file A file path
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*
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* @return bool
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*/
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public function isAbsolutePath($file)
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{
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return strspn($file, '/\\', 0, 1)
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|| (strlen($file) > 3 && ctype_alpha($file[0])
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&& substr($file, 1, 1) === ':'
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&& strspn($file, '/\\', 2, 1)
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)
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|| null !== parse_url($file, PHP_URL_SCHEME)
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;
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}
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/**
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* Creates a temporary file with support for custom stream wrappers.
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*
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* @param string $dir The directory where the temporary filename will be created
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* @param string $prefix The prefix of the generated temporary filename
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|
* Note: Windows uses only the first three characters of prefix
|
|
*
|
|
* @return string The new temporary filename (with path), or throw an exception on failure
|
|
*/
|
|
public function tempnam($dir, $prefix)
|
|
{
|
|
list($scheme, $hierarchy) = $this->getSchemeAndHierarchy($dir);
|
|
|
|
// If no scheme or scheme is "file" or "gs" (Google Cloud) create temp file in local filesystem
|
|
if (null === $scheme || 'file' === $scheme || 'gs' === $scheme) {
|
|
$tmpFile = @tempnam($hierarchy, $prefix);
|
|
|
|
// If tempnam failed or no scheme return the filename otherwise prepend the scheme
|
|
if (false !== $tmpFile) {
|
|
if (null !== $scheme && 'gs' !== $scheme) {
|
|
return $scheme.'://'.$tmpFile;
|
|
}
|
|
|
|
return $tmpFile;
|
|
}
|
|
|
|
throw new IOException('A temporary file could not be created.');
|
|
}
|
|
|
|
// Loop until we create a valid temp file or have reached 10 attempts
|
|
for ($i = 0; $i < 10; ++$i) {
|
|
// Create a unique filename
|
|
$tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);
|
|
|
|
// Use fopen instead of file_exists as some streams do not support stat
|
|
// Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
|
|
$handle = @fopen($tmpFile, 'x+');
|
|
|
|
// If unsuccessful restart the loop
|
|
if (false === $handle) {
|
|
continue;
|
|
}
|
|
|
|
// Close the file if it was successfully opened
|
|
@fclose($handle);
|
|
|
|
return $tmpFile;
|
|
}
|
|
|
|
throw new IOException('A temporary file could not be created.');
|
|
}
|
|
|
|
/**
|
|
* Atomically dumps content into a file.
|
|
*
|
|
* @param string $filename The file to be written to
|
|
* @param string $content The data to write into the file
|
|
*
|
|
* @throws IOException If the file cannot be written to.
|
|
*/
|
|
public function dumpFile($filename, $content)
|
|
{
|
|
$dir = dirname($filename);
|
|
|
|
if (!is_dir($dir)) {
|
|
$this->mkdir($dir);
|
|
} elseif (!is_writable($dir)) {
|
|
throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
|
|
}
|
|
|
|
// Will create a temp file with 0600 access rights
|
|
// when the filesystem supports chmod.
|
|
$tmpFile = $this->tempnam($dir, basename($filename));
|
|
|
|
if (false === @file_put_contents($tmpFile, $content)) {
|
|
throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
|
|
}
|
|
|
|
// Ignore for filesystems that do not support umask
|
|
@chmod($tmpFile, 0666);
|
|
$this->rename($tmpFile, $filename, true);
|
|
}
|
|
|
|
/**
|
|
* @param mixed $files
|
|
*
|
|
* @return \Traversable
|
|
*/
|
|
private function toIterator($files)
|
|
{
|
|
if (!$files instanceof \Traversable) {
|
|
$files = new \ArrayObject(is_array($files) ? $files : array($files));
|
|
}
|
|
|
|
return $files;
|
|
}
|
|
|
|
/**
|
|
* Gets a 2-tuple of scheme (may be null) and hierarchical part of a filename (e.g. file:///tmp -> array(file, tmp)).
|
|
*
|
|
* @param string $filename The filename to be parsed
|
|
*
|
|
* @return array The filename scheme and hierarchical part
|
|
*/
|
|
private function getSchemeAndHierarchy($filename)
|
|
{
|
|
$components = explode('://', $filename, 2);
|
|
|
|
return 2 === count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
|
|
}
|
|
}
|