453 lines
14 KiB
PHP
453 lines
14 KiB
PHP
<?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 0.21.1
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*/
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/**
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* zerobin_db
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*
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* Model for DB access, implemented as a singleton.
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*/
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class zerobin_db extends zerobin_abstract
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{
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/**
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* cache for select queries
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*
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* @var array
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*/
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private static $_cache = array();
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/**
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* instance of database connection
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*
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* @access private
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* @static
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* @var PDO
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*/
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private static $_db;
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/**
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* table prefix
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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 $_prefix = '';
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/**
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* database type
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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 $_type = '';
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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 $options
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* @throws Exception
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* @return zerobin_db
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*/
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public static function getInstance($options = null)
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{
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// if needed initialize the singleton
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if(!(self::$_instance instanceof zerobin_db)) {
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self::$_instance = new self;
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}
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if (is_array($options))
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{
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// set table prefix if given
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if (array_key_exists('tbl', $options)) self::$_prefix = $options['tbl'];
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// initialize the db connection with new options
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if (
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array_key_exists('dsn', $options) &&
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array_key_exists('usr', $options) &&
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array_key_exists('pwd', $options) &&
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array_key_exists('opt', $options)
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)
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{
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// set default options
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$options['opt'][PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
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$options['opt'][PDO::ATTR_EMULATE_PREPARES] = false;
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$options['opt'][PDO::ATTR_PERSISTENT] = true;
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// check if the database contains the required tables
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self::$_type = strtolower(
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substr($options['dsn'], 0, strpos($options['dsn'], ':'))
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);
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switch(self::$_type)
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{
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case 'ibm':
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$sql = 'SELECT tabname FROM SYSCAT.TABLES ';
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break;
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case 'informix':
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$sql = 'SELECT tabname FROM systables ';
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break;
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case 'mssql':
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$sql = "SELECT name FROM sysobjects "
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. "WHERE type = 'U' ORDER BY name";
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break;
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case 'mysql':
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$sql = 'SHOW TABLES';
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break;
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case 'oci':
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$sql = 'SELECT table_name FROM all_tables';
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break;
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case 'pgsql':
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$sql = "SELECT c.relname AS table_name "
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. "FROM pg_class c, pg_user u "
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. "WHERE c.relowner = u.usesysid AND c.relkind = 'r' "
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. "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
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. "AND c.relname !~ '^(pg_|sql_)' "
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. "UNION "
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. "SELECT c.relname AS table_name "
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. "FROM pg_class c "
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. "WHERE c.relkind = 'r' "
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. "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
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. "AND NOT EXISTS (SELECT 1 FROM pg_user WHERE usesysid = c.relowner) "
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. "AND c.relname !~ '^pg_'";
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break;
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case 'sqlite':
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$sql = "SELECT name FROM sqlite_master WHERE type='table' "
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. "UNION ALL SELECT name FROM sqlite_temp_master "
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. "WHERE type='table' ORDER BY name";
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break;
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default:
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throw new Exception(
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'PDO type ' .
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self::$_type .
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' is currently not supported.',
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5
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);
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}
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self::$_db = new PDO(
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$options['dsn'],
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$options['usr'],
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$options['pwd'],
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$options['opt']
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);
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$statement = self::$_db->query($sql);
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$tables = $statement->fetchAll(PDO::FETCH_COLUMN, 0);
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// create paste table if needed
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if (!in_array(self::$_prefix . 'paste', $tables))
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{
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self::$_db->exec(
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'CREATE TABLE ' . self::$_prefix . 'paste ( ' .
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'dataid CHAR(16), ' .
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'data TEXT, ' .
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'postdate INT, ' .
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'expiredate INT, ' .
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'opendiscussion INT, ' .
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'burnafterreading INT, ' .
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'meta TEXT );'
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);
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}
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// check if the meta column exists
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else
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{
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try {
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self::_exec('SELECT meta FROM ' . self::$_prefix . 'paste LIMIT 1;', array());
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} catch (PDOException $e) {
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self::$_db->exec('ALTER TABLE ' . self::$_prefix . 'paste ADD COLUMN meta TEXT;');
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}
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}
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// create comment table if needed
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if (!in_array(self::$_prefix . 'comment', $tables))
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{
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self::$_db->exec(
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'CREATE TABLE ' . self::$_prefix . 'comment ( ' .
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'dataid CHAR(16), ' .
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'pasteid CHAR(16), ' .
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'parentid CHAR(16), ' .
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'data TEXT, ' .
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'nickname VARCHAR(255), ' .
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'vizhash TEXT, ' .
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'postdate INT );'
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);
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}
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}
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}
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return self::$_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 $paste
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* @return bool
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*/
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public function create($pasteid, $paste)
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{
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if (
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array_key_exists($pasteid, self::$_cache)
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) {
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if(false !== self::$_cache[$pasteid]) {
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return false;
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} else {
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unset(self::$_cache[$pasteid]);
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}
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}
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$opendiscussion = $burnafterreading = false;
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$meta = $paste['meta'];
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unset($meta['postdate']);
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$expire_date = 0;
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if (array_key_exists('expire_date', $paste['meta']))
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{
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$expire_date = (int) $paste['meta']['expire_date'];
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unset($meta['expire_date']);
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}
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if (array_key_exists('opendiscussion', $paste['meta']))
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{
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$opendiscussion = (bool) $paste['meta']['opendiscussion'];
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unset($meta['opendiscussion']);
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}
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if (array_key_exists('burnafterreading', $paste['meta']))
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{
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$burnafterreading = (bool) $paste['meta']['burnafterreading'];
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unset($meta['burnafterreading']);
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}
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return self::_exec(
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'INSERT INTO ' . self::$_prefix . 'paste VALUES(?,?,?,?,?,?,?)',
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array(
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$pasteid,
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$paste['data'],
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$paste['meta']['postdate'],
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$expire_date,
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(int) $opendiscussion,
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(int) $burnafterreading,
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json_encode($meta),
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)
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);
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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 (
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!array_key_exists($pasteid, self::$_cache)
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) {
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self::$_cache[$pasteid] = false;
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$paste = self::_select(
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'SELECT * FROM ' . self::$_prefix . 'paste WHERE dataid = ?',
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array($pasteid), true
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);
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if(false !== $paste) {
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// create object
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self::$_cache[$pasteid] = new stdClass;
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self::$_cache[$pasteid]->data = $paste['data'];
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$meta = json_decode($paste['meta']);
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if (!is_object($meta)) $meta = new stdClass;
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if (property_exists($meta, 'attachment'))
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{
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self::$_cache[$pasteid]->attachment = $meta->attachment;
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unset($meta->attachment);
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if (property_exists($meta, 'attachmentname'))
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{
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self::$_cache[$pasteid]->attachmentname = $meta->attachmentname;
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unset($meta->attachmentname);
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}
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}
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self::$_cache[$pasteid]->meta = $meta;
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self::$_cache[$pasteid]->meta->postdate = (int) $paste['postdate'];
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$expire_date = (int) $paste['expiredate'];
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if (
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$expire_date > 0
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) self::$_cache[$pasteid]->meta->expire_date = $expire_date;
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if (
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$paste['opendiscussion']
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) self::$_cache[$pasteid]->meta->opendiscussion = true;
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if (
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$paste['burnafterreading']
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) self::$_cache[$pasteid]->meta->burnafterreading = true;
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}
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}
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return self::$_cache[$pasteid];
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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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self::_exec(
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'DELETE FROM ' . self::$_prefix . 'paste WHERE dataid = ?',
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array($pasteid)
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);
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self::_exec(
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'DELETE FROM ' . self::$_prefix . 'comment WHERE pasteid = ?',
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array($pasteid)
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);
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if (
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array_key_exists($pasteid, self::$_cache)
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) unset(self::$_cache[$pasteid]);
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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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if (
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!array_key_exists($pasteid, self::$_cache)
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) self::$_cache[$pasteid] = $this->read($pasteid);
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return (bool) self::$_cache[$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, $comment)
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{
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return self::_exec(
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'INSERT INTO ' . self::$_prefix . 'comment VALUES(?,?,?,?,?,?,?)',
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array(
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$commentid,
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$pasteid,
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$parentid,
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$comment['data'],
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$comment['meta']['nickname'],
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$comment['meta']['vizhash'],
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$comment['meta']['postdate'],
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)
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);
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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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$rows = self::_select(
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'SELECT * FROM ' . self::$_prefix . 'comment WHERE pasteid = ?',
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array($pasteid)
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);
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// create comment list
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$comments = array();
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if (count($rows))
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{
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foreach ($rows as $row)
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{
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$i = $this->getOpenSlot($comments, (int) $row['postdate']);
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$comments[$i] = new stdClass;
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$comments[$i]->id = $row['dataid'];
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$comments[$i]->parentid = $row['parentid'];
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$comments[$i]->data = $row['data'];
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$comments[$i]->meta = new stdClass;
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$comments[$i]->meta->postdate = (int) $row['postdate'];
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if (array_key_exists('nickname', $row))
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$comments[$i]->meta->nickname = $row['nickname'];
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if (array_key_exists('vizhash', $row))
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$comments[$i]->meta->vizhash = $row['vizhash'];
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}
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ksort($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, $commentid)
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{
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return (bool) self::_select(
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'SELECT dataid FROM ' . self::$_prefix . 'comment ' .
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'WHERE pasteid = ? AND parentid = ? AND dataid = ?',
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array($pasteid, $parentid, $commentid), true
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);
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}
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/**
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* execute a statement
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*
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* @access private
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* @static
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* @param string $sql
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* @param array $params
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* @throws PDOException
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* @return array
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*/
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private static function _exec($sql, array $params)
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{
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$statement = self::$_db->prepare($sql);
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$result = $statement->execute($params);
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$statement->closeCursor();
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return $result;
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}
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/**
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* run a select statement
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*
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* @access private
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* @static
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* @param string $sql
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* @param array $params
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* @param bool $firstOnly if only the first row should be returned
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* @throws PDOException
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* @return array
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*/
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private static function _select($sql, array $params, $firstOnly = false)
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{
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$statement = self::$_db->prepare($sql);
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$statement->execute($params);
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$result = $firstOnly ?
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$statement->fetch(PDO::FETCH_ASSOC) :
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$statement->fetchAll(PDO::FETCH_ASSOC);
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$statement->closeCursor();
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return $result;
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}
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}
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