includes/captcha.php
author Dan
Sat, 24 May 2008 23:40:42 -0400
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parent 536 218a627eb53e
child 558 fd082123f2f4
permissions -rw-r--r--
More work done on effective permissions API, namely reporting of page group and usergroup names
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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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 * Version 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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      $db->_die();
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  }
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  /**
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   * Changes the confirmation code
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   * @param string New string
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   */
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  function set_code($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 = 'bc';
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    }
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  }
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  if( !extension_loaded("gd") || !function_exists("gd_info") || !function_exists('imagettftext') )
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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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?>