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255 lines
7.0 KiB
255 lines
7.0 KiB
<?php
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/**
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* ZeroBin
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*
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* a zero-knowledge paste bin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.15
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*/
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/**
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* zerobin_data
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*
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* Model for data access, implemented as a singleton.
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*/
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class zerobin_data extends zerobin_abstract
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{
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/*
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* @access private
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* @static
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* @var string directory where data is stored
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*/
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private static $_dir = 'data/';
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/**
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* get instance of singleton
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*
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* @access public
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* @static
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* @return zerobin_data
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*/
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public static function getInstance($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', $options)
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) self::$_dir = $options['dir'] . DIRECTORY_SEPARATOR;
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// if needed initialize the singleton
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if(!(self::$_instance instanceof zerobin_data)) {
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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 $paste
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* @return int|false
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*/
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public function create($pasteid, $paste)
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{
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$storagedir = self::_dataid2path($pasteid);
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if (is_file($storagedir . $pasteid)) return false;
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if (!is_dir($storagedir)) mkdir($storagedir, 0705, true);
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return (bool) file_put_contents($storagedir . $pasteid, json_encode($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)) return false;
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return json_decode(
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file_get_contents(self::_dataid2path($pasteid) . $pasteid)
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);
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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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// Delete the paste itself.
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unlink(self::_dataid2path($pasteid) . $pasteid);
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// Delete discussion if it exists.
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir))
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{
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// Delete all files in discussion directory
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read()))
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{
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if (is_file($discdir.$filename)) unlink($discdir.$filename);
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}
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$dir->close();
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// Delete the discussion directory.
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rmdir($discdir);
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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 $dataid
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* @return void
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*/
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public function exists($pasteid)
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{
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return is_file(self::_dataid2path($pasteid) . $pasteid);
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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 $comment
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* @return int|false
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*/
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public function createComment($pasteid, $parentid, $commentid, $comment)
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{
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$storagedir = self::_dataid2discussionpath($pasteid);
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$filename = $pasteid . '.' . $commentid . '.' . $parentid;
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if (is_file($storagedir . $filename)) return false;
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if (!is_dir($storagedir)) mkdir($storagedir, 0705, true);
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return file_put_contents($storagedir . $filename, json_encode($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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{
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// Delete all files in discussion directory
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read()))
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{
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// Filename is in the form pasteid.commentid.parentid:
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// - pasteid is the paste this reply belongs to.
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// - commentid is the comment identifier itself.
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// - parentid is the comment this comment replies to (It can be pasteid)
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if (is_file($discdir.$filename))
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{
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$comment = json_decode(file_get_contents($discdir.$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->meta->commentid=$items[1];
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$comment->meta->parentid=$items[2];
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// Store in array
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$comments[$comment->meta->postdate]=$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 $dataid
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* @param string $parentid
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* @param string $commentid
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* @return void
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*/
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public function existsComment($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 . '.' . $parentid
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);
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}
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/**
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* initialize zerobin
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*
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* @access private
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* @static
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* @return void
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*/
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private static function _init()
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{
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// Create storage directory if it does not exist.
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if (!is_dir(self::$_dir)) mkdir(self::$_dir, 0705);
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// Create .htaccess file if it does not exist.
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if (!is_file(self::$_dir . '.htaccess'))
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{
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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 $dataid
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* @return void
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*/
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private static function _dataid2path($dataid)
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{
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return self::$_dir . substr($dataid,0,2) . '/' . substr($dataid,2,2) . '/';
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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 $dataid
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* @return void
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*/
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private static function _dataid2discussionpath($dataid)
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{
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return self::_dataid2path($dataid) . $dataid . '.discussion/';
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}
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}
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