713 lines
23 KiB
PHP
713 lines
23 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
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*/
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namespace PrivateBin\Data;
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use Exception;
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use PDO;
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use PDOException;
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use PrivateBin\PrivateBin;
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use stdClass;
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/**
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* Database
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*
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* Model for database access, implemented as a singleton.
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*/
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class Database extends AbstractData
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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 $options
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* @throws Exception
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* @return Database
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*/
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public static function getInstance($options = null)
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{
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// if needed initialize the singleton
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if (!(self::$_instance instanceof self)) {
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self::$_instance = new self;
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}
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if (is_array($options)) {
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// set table prefix if given
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if (array_key_exists('tbl', $options)) {
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self::$_prefix = $options['tbl'];
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}
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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', $options)
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) {
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// set default options
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$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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$db_tables_exist = true;
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// setup type and dabase connection
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self::$_type = strtolower(
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substr($options['dsn'], 0, strpos($options['dsn'], ':'))
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);
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$tableQuery = self::_getTableQuery(self::$_type);
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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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$options['opt']
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);
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// check if the database contains the required tables
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$tables = self::$_db->query($tableQuery)->fetchAll(PDO::FETCH_COLUMN, 0);
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// create paste table if necessary
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if (!in_array(self::_sanitizeIdentifier('paste'), $tables)) {
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self::_createPasteTable();
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$db_tables_exist = false;
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}
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// create comment table if necessary
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if (!in_array(self::_sanitizeIdentifier('comment'), $tables)) {
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self::_createCommentTable();
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$db_tables_exist = false;
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}
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// create config table if necessary
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$db_version = PrivateBin::VERSION;
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if (!in_array(self::_sanitizeIdentifier('config'), $tables)) {
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self::_createConfigTable();
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// if we only needed to create the config table, the DB is older then 0.22
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if ($db_tables_exist) {
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$db_version = '0.21';
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}
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} else {
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$db_version = self::_getConfig('VERSION');
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}
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// update database structure if necessary
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if (version_compare($db_version, PrivateBin::VERSION, '<')) {
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self::_upgradeDatabase($db_version);
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}
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} else {
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throw new Exception(
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'Missing configuration for key dsn, usr, pwd or opt in the section model_options, please check your configuration file', 6
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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 = $burnafterreading = false;
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$attachment = $attachmentname = '';
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$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', $paste['meta'])) {
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$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', $paste['meta'])) {
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$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', $paste['meta'])) {
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$burnafterreading = (bool) $paste['meta']['burnafterreading'];
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unset($meta['burnafterreading']);
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}
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if (array_key_exists('attachment', $paste['meta'])) {
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$attachment = $paste['meta']['attachment'];
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unset($meta['attachment']);
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}
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if (array_key_exists('attachmentname', $paste['meta'])) {
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$attachmentname = $paste['meta']['attachmentname'];
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unset($meta['attachmentname']);
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}
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return self::_exec(
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'INSERT INTO ' . self::_sanitizeIdentifier('paste') .
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' 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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$attachment,
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$attachmentname,
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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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$paste = self::_select(
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'SELECT * FROM ' . self::_sanitizeIdentifier('paste') .
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' WHERE dataid = ?', array($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)) {
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$meta = new stdClass;
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}
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// support older attachments
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if (property_exists($meta, 'attachment')) {
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self::$_cache[$pasteid]->attachment = $meta->attachment;
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unset($meta->attachment);
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if (property_exists($meta, 'attachmentname')) {
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self::$_cache[$pasteid]->attachmentname = $meta->attachmentname;
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unset($meta->attachmentname);
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}
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}
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// support current attachments
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elseif (array_key_exists('attachment', $paste) && strlen($paste['attachment'])) {
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self::$_cache[$pasteid]->attachment = $paste['attachment'];
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if (array_key_exists('attachmentname', $paste) && strlen($paste['attachmentname'])) {
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self::$_cache[$pasteid]->attachmentname = $paste['attachmentname'];
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}
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}
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self::$_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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) {
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self::$_cache[$pasteid]->meta->expire_date = $expire_date;
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}
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if (
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$paste['opendiscussion']
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) {
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self::$_cache[$pasteid]->meta->opendiscussion = true;
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}
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if (
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$paste['burnafterreading']
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) {
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self::$_cache[$pasteid]->meta->burnafterreading = true;
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}
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}
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}
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return self::$_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::_sanitizeIdentifier('paste') .
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' WHERE dataid = ?', array($pasteid)
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);
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self::_exec(
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'DELETE FROM ' . self::_sanitizeIdentifier('comment') .
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' WHERE pasteid = ?', array($pasteid)
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);
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if (
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array_key_exists($pasteid, self::$_cache)
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) {
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unset(self::$_cache[$pasteid]);
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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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if (
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!array_key_exists($pasteid, self::$_cache)
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) {
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self::$_cache[$pasteid] = $this->read($pasteid);
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}
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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 $comment
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* @return bool
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*/
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public function createComment($pasteid, $parentid, $commentid, $comment)
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{
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foreach (array('nickname', 'vizhash') as $key) {
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if (!array_key_exists($key, $comment['meta'])) {
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$comment['meta'][$key] = null;
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}
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}
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return self::_exec(
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'INSERT INTO ' . self::_sanitizeIdentifier('comment') .
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' VALUES(?,?,?,?,?,?,?)',
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array(
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$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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$rows = self::_select(
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'SELECT * FROM ' . self::_sanitizeIdentifier('comment') .
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' WHERE pasteid = ?', array($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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foreach ($rows as $row) {
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$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', $row) && !empty($row['nickname'])) {
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$comments[$i]->meta->nickname = $row['nickname'];
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}
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if (array_key_exists('vizhash', $row) && !empty($row['vizhash'])) {
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$comments[$i]->meta->vizhash = $row['vizhash'];
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}
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}
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ksort($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 $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, $commentid)
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{
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return (bool) self::_select(
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'SELECT dataid FROM ' . self::_sanitizeIdentifier('comment') .
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' WHERE pasteid = ? AND parentid = ? AND dataid = ?',
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array($pasteid, $parentid, $commentid), true
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);
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}
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/**
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* 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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$pastes = array();
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$rows = self::_select(
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'SELECT dataid FROM ' . self::_sanitizeIdentifier('paste') .
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' WHERE expiredate < ? AND expiredate != ? LIMIT ?', array(time(), 0, $batchsize)
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);
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if (count($rows)) {
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foreach ($rows as $row) {
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$pastes[] = $row['dataid'];
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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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* 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 $params
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* @throws PDOException
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* @return bool
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*/
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private static function _exec($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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* get table list query, depending on the database type
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*
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* @access private
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* @static
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* @param string $type
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* @throws Exception
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* @return string
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*/
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private static function _getTableQuery($type)
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{
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switch ($type) {
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case 'ibm':
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$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 $type is currently not supported.", 5
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);
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}
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return $sql;
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}
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/**
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* get a value by key from the config table
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*
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* @access private
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* @static
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* @param string $key
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* @throws PDOException
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* @return string
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*/
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private static function _getConfig($key)
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{
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$row = self::_select(
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'SELECT value FROM ' . self::_sanitizeIdentifier('config') .
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' WHERE id = ?', array($key), true
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);
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return $row['value'];
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}
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/**
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* get the primary key clauses, depending on the database driver
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*
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* @access private
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* @static
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* @param string $key
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* @return array
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*/
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private static function _getPrimaryKeyClauses($key = 'dataid')
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{
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$main_key = $after_key = '';
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if (self::$_type === 'mysql') {
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$after_key = ", PRIMARY KEY ($key)";
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} else {
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$main_key = ' PRIMARY KEY';
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}
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return array($main_key, $after_key);
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}
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/**
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* create the paste table
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*
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* @access private
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* @static
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* @return void
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*/
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private static function _createPasteTable()
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{
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list($main_key, $after_key) = self::_getPrimaryKeyClauses();
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$dataType = self::$_type === 'pgsql' ? 'TEXT' : 'BLOB';
|
|
self::$_db->exec(
|
|
'CREATE TABLE ' . self::_sanitizeIdentifier('paste') . ' ( ' .
|
|
"dataid CHAR(16) NOT NULL$main_key, " .
|
|
"data $dataType, " .
|
|
'postdate INT, ' .
|
|
'expiredate INT, ' .
|
|
'opendiscussion INT, ' .
|
|
'burnafterreading INT, ' .
|
|
'meta TEXT, ' .
|
|
'attachment ' . (self::$_type === 'pgsql' ? 'TEXT' : 'MEDIUMBLOB') . ', ' .
|
|
"attachmentname $dataType$after_key );"
|
|
);
|
|
}
|
|
|
|
/**
|
|
* create the paste table
|
|
*
|
|
* @access private
|
|
* @static
|
|
* @return void
|
|
*/
|
|
private static function _createCommentTable()
|
|
{
|
|
list($main_key, $after_key) = self::_getPrimaryKeyClauses();
|
|
$dataType = self::$_type === 'pgsql' ? 'text' : 'BLOB';
|
|
self::$_db->exec(
|
|
'CREATE TABLE ' . self::_sanitizeIdentifier('comment') . ' ( ' .
|
|
"dataid CHAR(16) NOT NULL$main_key, " .
|
|
'pasteid CHAR(16), ' .
|
|
'parentid CHAR(16), ' .
|
|
"data $dataType, " .
|
|
"nickname $dataType, " .
|
|
"vizhash $dataType, " .
|
|
"postdate INT$after_key );"
|
|
);
|
|
self::$_db->exec(
|
|
'CREATE INDEX IF NOT EXISTS comment_parent ON ' .
|
|
self::_sanitizeIdentifier('comment') . '(pasteid);'
|
|
);
|
|
}
|
|
|
|
/**
|
|
* create the paste table
|
|
*
|
|
* @access private
|
|
* @static
|
|
* @return void
|
|
*/
|
|
private static function _createConfigTable()
|
|
{
|
|
list($main_key, $after_key) = self::_getPrimaryKeyClauses('id');
|
|
self::$_db->exec(
|
|
'CREATE TABLE ' . self::_sanitizeIdentifier('config') .
|
|
" ( id CHAR(16) NOT NULL$main_key, value TEXT$after_key );"
|
|
);
|
|
self::_exec(
|
|
'INSERT INTO ' . self::_sanitizeIdentifier('config') .
|
|
' VALUES(?,?)',
|
|
array('VERSION', PrivateBin::VERSION)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* sanitizes identifiers
|
|
*
|
|
* @access private
|
|
* @static
|
|
* @param string $identifier
|
|
* @return string
|
|
*/
|
|
private static function _sanitizeIdentifier($identifier)
|
|
{
|
|
return preg_replace('/[^A-Za-z0-9_]+/', '', self::$_prefix . $identifier);
|
|
}
|
|
|
|
/**
|
|
* upgrade the database schema from an old version
|
|
*
|
|
* @access private
|
|
* @static
|
|
* @param string $oldversion
|
|
* @return void
|
|
*/
|
|
private static function _upgradeDatabase($oldversion)
|
|
{
|
|
$dataType = self::$_type === 'pgsql' ? 'TEXT' : 'BLOB';
|
|
switch ($oldversion) {
|
|
case '0.21':
|
|
// create the meta column if necessary (pre 0.21 change)
|
|
try {
|
|
self::$_db->exec('SELECT meta FROM ' . self::_sanitizeIdentifier('paste') . ' LIMIT 1;');
|
|
} catch (PDOException $e) {
|
|
self::$_db->exec('ALTER TABLE ' . self::_sanitizeIdentifier('paste') . ' ADD COLUMN meta TEXT;');
|
|
}
|
|
// SQLite only allows one ALTER statement at a time...
|
|
self::$_db->exec(
|
|
'ALTER TABLE ' . self::_sanitizeIdentifier('paste') .
|
|
' ADD COLUMN attachment ' .
|
|
(self::$_type === 'pgsql' ? 'TEXT' : 'MEDIUMBLOB') . ';'
|
|
);
|
|
self::$_db->exec(
|
|
'ALTER TABLE ' . self::_sanitizeIdentifier('paste') . " ADD COLUMN attachmentname $dataType;"
|
|
);
|
|
// SQLite doesn't support MODIFY, but it allows TEXT of similar
|
|
// size as BLOB, so there is no need to change it there
|
|
if (self::$_type !== 'sqlite') {
|
|
self::$_db->exec(
|
|
'ALTER TABLE ' . self::_sanitizeIdentifier('paste') .
|
|
' ADD PRIMARY KEY (dataid), MODIFY COLUMN data $dataType;'
|
|
);
|
|
self::$_db->exec(
|
|
'ALTER TABLE ' . self::_sanitizeIdentifier('comment') .
|
|
" ADD PRIMARY KEY (dataid), MODIFY COLUMN data $dataType, " .
|
|
"MODIFY COLUMN nickname $dataType, MODIFY COLUMN vizhash $dataType;"
|
|
);
|
|
} else {
|
|
self::$_db->exec(
|
|
'CREATE UNIQUE INDEX IF NOT EXISTS paste_dataid ON ' .
|
|
self::_sanitizeIdentifier('paste') . '(dataid);'
|
|
);
|
|
self::$_db->exec(
|
|
'CREATE UNIQUE INDEX IF NOT EXISTS comment_dataid ON ' .
|
|
self::_sanitizeIdentifier('comment') . '(dataid);'
|
|
);
|
|
}
|
|
self::$_db->exec(
|
|
'CREATE INDEX IF NOT EXISTS comment_parent ON ' .
|
|
self::_sanitizeIdentifier('comment') . '(pasteid);'
|
|
);
|
|
// no break, continue with updates for 0.22
|
|
case '0.22':
|
|
case '1.0':
|
|
self::_exec(
|
|
'UPDATE ' . self::_sanitizeIdentifier('config') .
|
|
' SET value = ? WHERE id = ?',
|
|
array(PrivateBin::VERSION, 'VERSION')
|
|
);
|
|
}
|
|
}
|
|
}
|