includes/captcha.php
author Dan
Sun, 25 Jan 2009 20:35:06 -0500
changeset 823 4596c40aaa94
parent 801 eb8b23f11744
child 1025 30956e5092ff
permissions -rw-r--r--
AJAX core library: possible breaking change, readystatechange functions are now called with the XHR instance as the first parameter, to allow requests to run in parallel. This means much better stability but may break some applets (compatibility hack is included)
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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eb8b23f11744 Two big commits in one day I know, but redid password storage to use HMAC-SHA1. Consolidated much AES processing to three core methods in session that should handle everything automagically. Installation works; upgrades should. Rebranded as 1.1.6.
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 * Version 1.1.6 (Caoineag beta 1)
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218a627eb53e Rebrand as 1.1.4 (Caoineag alpha 4)
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 * Copyright (C) 2006-2008 Dan Fuhry
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 * captcha.php - visual confirmation system used during registration
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * The base class for CAPTCHA engines.
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 * @package Enano
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 * @subpackage User management
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 * @copyright 2008 Dan Fuhry
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 */
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class captcha_base
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{
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  /**
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   * Our session ID
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   * @var string
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   */
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  private $session_id;
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  /**
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   * Our saved session data
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   * @var array
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   */
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  private $session_data;
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  /**
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   * The confirmation code we're generating.
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   * @var string
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   */
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  private $code = '';
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  /**
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   * Numerical ID (primary key) for our session
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   * @var int
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   */
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  private $id = 0;
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  /**
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   * Constructor.
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   * @param string Session ID for captcha
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   */
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  function __construct($session_id, $row = false)
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  {
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    global $db, $session, $paths, $template, $plugins; // Common objects
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    if ( !preg_match('/^[a-f0-9]{32}([a-z0-9]{8})?$/', $session_id) )
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    {
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      throw new Exception('Invalid session ID');
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    }
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    $this->session_id = $session_id;
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    // If we weren't supplied with session info, retreive it
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    if ( !is_array($row) )
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    {
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      $q = $db->sql_query('SELECT code_id, code, session_data FROM ' . table_prefix . "captcha WHERE session_id = '$session_id';");
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      if ( !$q )
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        $db->_die();
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      $row = $db->fetchrow();
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      $row['code_id'] = intval($row['code_id']);
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      $db->free_result();
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    }
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    if ( !isset($row['code']) || !isset($row['session_data']) || !is_int(@$row['code_id']) )
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    {
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      throw new Exception('Row doesn\'t contain what we need (code and session_data)');
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    }
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    $this->session_data = ( is_array($x = @unserialize($row['session_data'])) ) ? $x : array();
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    $this->code = $row['code'];
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    $this->id = $row['code_id'];
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    // run any custom init functions
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    if ( function_exists(array($this, 'construct_hook')) )
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      $this->construct_hook();
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  }
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  /**
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   * Retrieves a key from the session data set
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   * @param int|string Key to fetch
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   * @param mixed Default value for key
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   * @return mixed
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   */
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  function session_fetch($key, $default = false)
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  {
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    return ( isset($this->session_data[$key]) ) ? $this->session_data[$key] : $default;
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  }
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  /**
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   * Stores a value in the session's data set. Change must be committed using $captcha->session_commit()
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   * @param int|string Name of key
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   * @param mixed Value - can be an array, string, int, or double, but probably not objects :-)
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   */
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  function session_store($key, $value)
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  {
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    $this->session_data[$key] = $value;
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  }
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  /**
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   * Commits changes to the session data set to the database.
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   */
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  function session_commit()
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  {
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    global $db, $session, $paths, $template, $plugins; // Common objects
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    $session_data = serialize($this->session_data);
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    $session_data = $db->escape($session_data);
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    $code = $db->escape($this->code);
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    $q = $db->sql_query('UPDATE ' . table_prefix . "captcha SET code = '$code', session_data = '$session_data' WHERE code_id = {$this->id};");
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    if ( !$q )
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      $db->_die();
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  }
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  /**
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   * Changes the confirmation code
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   * @param string New string
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   */
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401
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  function set_code($code)
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  {
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    if ( !is_string($code) )
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      return false;
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    $this->code = $code;
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  }
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  /**
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   * Returns the confirmation code
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   * @return string
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   */
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  function get_code()
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  {
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    return $this->code;
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  }
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}
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/**
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 * Returns a new captcha object
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 * @param string Session ID
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 * @param string Optional - engine to load
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 * @param array Optional row to send to the captcha engine
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 */
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function captcha_object($session_id, $engine = false, $row = false)
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{
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  static $singletons = array();
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  if ( !$engine )
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  {
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    $engine = getConfig('captcha_engine');
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    if ( !$engine )
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    {
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      $engine = 'freecap';
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    }
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  }
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  if( !extension_loaded("gd") || !function_exists("gd_info") || !function_exists('imagettftext') || !function_exists('imagepng') || !function_exists('imagecreatefromjpeg') )
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  {
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    $engine = 'failsafe';
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  }
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  if ( !class_exists("captcha_engine_$engine") )
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  {
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    require_once ENANO_ROOT . "/includes/captcha/engine_{$engine}.php";
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  }
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  if ( !class_exists("captcha_engine_$engine") )
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  {
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    throw new Exception("Expected but couldn't find class for captcha engine: captcha_engine_$engine");
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  }
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  $class = "captcha_engine_$engine";
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  return new $class($session_id, $row);
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}
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?>