440 lines
13 KiB
PHP
440 lines
13 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.1.1
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*/
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namespace PrivateBin\Data;
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use PrivateBin\Json;
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use PrivateBin\Model\Paste;
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/**
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* Filesystem
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*
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* Model for filesystem data access, implemented as a singleton.
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*/
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class Filesystem extends AbstractData
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{
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/**
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* First line in JSON files, to hide contents
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*
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* @const string
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*/
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const PROTECTION_LINE = '<?php http_response_code(403); /*';
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/**
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* directory where data is stored
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_dir = 'data/';
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/**
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* get instance of singleton
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*
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* @access public
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* @static
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* @param array $options
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* @return Filesystem
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*/
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public static function getInstance($options = null)
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{
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// if given update the data directory
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if (
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is_array($options) &&
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array_key_exists('dir', $options)
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) {
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self::$_dir = $options['dir'] . DIRECTORY_SEPARATOR;
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}
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// if needed initialize the singleton
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if (!(self::$_instance instanceof self)) {
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self::$_instance = new self;
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self::_init();
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}
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return self::$_instance;
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}
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/**
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* Create a paste.
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*
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* @access public
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* @param string $pasteid
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* @param array $paste
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* @throws Exception
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* @return bool
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*/
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public function create($pasteid, $paste)
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{
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$storagedir = self::_dataid2path($pasteid);
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if (is_file($storagedir . $pasteid . '.php')) {
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return false;
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}
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if (!is_dir($storagedir)) {
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mkdir($storagedir, 0700, true);
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}
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return (bool) file_put_contents($storagedir . $pasteid . '.php', self::PROTECTION_LINE . PHP_EOL . Json::encode($paste));
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}
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/**
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* Read a paste.
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*
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* @access public
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* @param string $pasteid
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* @return stdClass|false
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*/
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public function read($pasteid)
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{
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if (!$this->exists($pasteid)) {
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return false;
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}
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$paste = self::_decodeFile(self::_dataid2path($pasteid) . $pasteid . '.php');
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if (property_exists($paste->meta, 'attachment')) {
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$paste->attachment = $paste->meta->attachment;
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unset($paste->meta->attachment);
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if (property_exists($paste->meta, 'attachmentname')) {
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$paste->attachmentname = $paste->meta->attachmentname;
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unset($paste->meta->attachmentname);
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}
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}
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return $paste;
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}
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/**
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* Delete a paste and its discussion.
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*
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* @access public
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* @param string $pasteid
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* @return void
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*/
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public function delete($pasteid)
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{
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$pastedir = self::_dataid2path($pasteid);
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if (is_dir($pastedir)) {
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// Delete the paste itself.
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if (is_file($pastedir . $pasteid . '.php')) {
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unlink($pastedir . $pasteid . '.php');
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}
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// Delete discussion if it exists.
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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// Delete all files in discussion directory
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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if (is_file($discdir . $filename)) {
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unlink($discdir . $filename);
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}
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}
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$dir->close();
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rmdir($discdir);
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}
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}
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}
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/**
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* Test if a paste exists.
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*
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* @access public
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* @param string $pasteid
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* @return bool
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*/
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public function exists($pasteid)
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{
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$basePath = self::_dataid2path($pasteid) . $pasteid;
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$pastePath = $basePath . '.php';
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// convert to PHP protected files if needed
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if (is_readable($basePath)) {
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$context = stream_context_create();
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// don't overwrite already converted file
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if (!is_file($pastePath)) {
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$handle = fopen($basePath, 'r', false, $context);
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file_put_contents($pastePath, self::PROTECTION_LINE . PHP_EOL);
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file_put_contents($pastePath, $handle, FILE_APPEND);
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fclose($handle);
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}
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unlink($basePath);
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// convert comments, too
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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if (substr($filename, -4) !== '.php' && strlen($filename) >= 16) {
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$commentFilename = $discdir . $filename . '.php';
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// don't overwrite already converted file
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if (!is_file($commentFilename)) {
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$handle = fopen($discdir . $filename, 'r', false, $context);
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file_put_contents($commentFilename, self::PROTECTION_LINE . PHP_EOL);
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file_put_contents($commentFilename, $handle, FILE_APPEND);
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fclose($handle);
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}
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unlink($discdir . $filename);
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}
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}
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$dir->close();
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}
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}
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return is_readable($pastePath);
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}
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/**
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* Create a comment in a paste.
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*
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* @access public
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* @param string $pasteid
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* @param string $parentid
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* @param string $commentid
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* @param array $comment
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* @throws Exception
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* @return bool
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*/
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public function createComment($pasteid, $parentid, $commentid, $comment)
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{
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$storagedir = self::_dataid2discussionpath($pasteid);
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$filename = $pasteid . '.' . $commentid . '.' . $parentid . '.php';
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if (is_file($storagedir . $filename)) {
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return false;
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}
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if (!is_dir($storagedir)) {
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mkdir($storagedir, 0700, true);
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}
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return (bool) file_put_contents($storagedir . $filename, self::PROTECTION_LINE . PHP_EOL . Json::encode($comment));
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}
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/**
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* Read all comments of paste.
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*
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* @access public
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* @param string $pasteid
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* @return array
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*/
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public function readComments($pasteid)
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{
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$comments = array();
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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// Filename is in the form pasteid.commentid.parentid.php:
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// - pasteid is the paste this reply belongs to.
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// - commentid is the comment identifier itself.
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// - parentid is the comment this comment replies to (It can be pasteid)
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if (is_file($discdir . $filename)) {
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$comment = self::_decodeFile($discdir . $filename);
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$items = explode('.', $filename);
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// Add some meta information not contained in file.
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$comment->id = $items[1];
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$comment->parentid = $items[2];
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// Store in array
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$key = $this->getOpenSlot($comments, (int) $comment->meta->postdate);
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$comments[$key] = $comment;
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}
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}
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$dir->close();
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// Sort comments by date, oldest first.
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ksort($comments);
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}
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return $comments;
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}
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/**
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* Test if a comment exists.
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*
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* @access public
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* @param string $pasteid
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* @param string $parentid
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* @param string $commentid
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* @return bool
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*/
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public function existsComment($pasteid, $parentid, $commentid)
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{
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return is_file(
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self::_dataid2discussionpath($pasteid) .
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$pasteid . '.' . $commentid . '.' . $parentid . '.php'
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);
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}
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/**
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* Returns up to batch size number of paste ids that have expired
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*
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* @access private
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* @param int $batchsize
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* @return array
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*/
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protected function _getExpiredPastes($batchsize)
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{
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$pastes = array();
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$firstLevel = array_filter(
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scandir(self::$_dir),
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'self::_isFirstLevelDir'
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);
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if (count($firstLevel) > 0) {
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// try at most 10 times the $batchsize pastes before giving up
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for ($i = 0, $max = $batchsize * 10; $i < $max; ++$i) {
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$firstKey = array_rand($firstLevel);
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$secondLevel = array_filter(
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scandir(self::$_dir . $firstLevel[$firstKey]),
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'self::_isSecondLevelDir'
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);
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// skip this folder in the next checks if it is empty
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if (count($secondLevel) == 0) {
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unset($firstLevel[$firstKey]);
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continue;
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}
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$secondKey = array_rand($secondLevel);
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$path = self::$_dir . $firstLevel[$firstKey] .
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DIRECTORY_SEPARATOR . $secondLevel[$secondKey];
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if (!is_dir($path)) {
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continue;
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}
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$thirdLevel = array_filter(
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array_map(
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function ($filename) {
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return strlen($filename) >= 20 ?
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substr($filename, 0, -4) :
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$filename;
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},
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scandir($path)
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),
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'PrivateBin\\Model\\Paste::isValidId'
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);
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if (count($thirdLevel) == 0) {
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continue;
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}
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$thirdKey = array_rand($thirdLevel);
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$pasteid = $thirdLevel[$thirdKey];
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if (in_array($pasteid, $pastes)) {
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continue;
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}
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if ($this->exists($pasteid)) {
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$data = $this->read($pasteid);
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if (
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property_exists($data->meta, 'expire_date') &&
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$data->meta->expire_date < time()
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) {
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$pastes[] = $pasteid;
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if (count($pastes) >= $batchsize) {
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break;
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}
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}
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}
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}
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}
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return $pastes;
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}
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/**
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* initialize privatebin
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*
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* @access private
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* @static
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* @return void
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*/
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private static function _init()
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{
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// Create storage directory if it does not exist.
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if (!is_dir(self::$_dir)) {
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mkdir(self::$_dir, 0700);
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}
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// Create .htaccess file if it does not exist.
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if (!is_file(self::$_dir . '.htaccess')) {
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file_put_contents(
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self::$_dir . '.htaccess',
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'Allow from none' . PHP_EOL .
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'Deny from all' . PHP_EOL
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);
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}
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}
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/**
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* Convert paste id to storage path.
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*
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* The idea is to creates subdirectories in order to limit the number of files per directory.
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* (A high number of files in a single directory can slow things down.)
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* eg. "f468483c313401e8" will be stored in "data/f4/68/f468483c313401e8"
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* High-trafic websites may want to deepen the directory structure (like Squid does).
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*
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* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/'
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*
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* @access private
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* @static
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* @param string $dataid
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* @return string
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*/
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private static function _dataid2path($dataid)
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{
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return self::$_dir . substr($dataid, 0, 2) . DIRECTORY_SEPARATOR .
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substr($dataid, 2, 2) . DIRECTORY_SEPARATOR;
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}
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/**
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* Convert paste id to discussion storage path.
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*
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* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/e3570978f9e4aa90.discussion/'
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*
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* @access private
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* @static
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* @param string $dataid
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* @return string
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*/
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private static function _dataid2discussionpath($dataid)
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{
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return self::_dataid2path($dataid) . $dataid .
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'.discussion' . DIRECTORY_SEPARATOR;
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}
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/**
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* Check that the given element is a valid first level directory.
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*
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* @access private
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* @static
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* @param string $element
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* @return bool
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*/
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private static function _isFirstLevelDir($element)
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{
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return self::_isSecondLevelDir($element) &&
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is_dir(self::$_dir . DIRECTORY_SEPARATOR . $element);
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}
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/**
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* Check that the given element is a valid second level directory.
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*
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* @access private
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* @static
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* @param string $element
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* @return bool
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*/
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private static function _isSecondLevelDir($element)
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{
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return (bool) preg_match('/^[a-f0-9]{2}$/', $element);
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}
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/**
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* Decodes a paste or comment file.
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*
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* @access private
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* @static
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* @param string $file
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* @return array
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*/
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private static function _decodeFile($file)
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{
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return json_decode(substr(file_get_contents($file), strlen(self::PROTECTION_LINE . PHP_EOL)));
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}
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}
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