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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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Fixed some upgrade bugs; added support for choosing one's own date/time formats; rebrand as 1.1.7
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* Copyright (C) 2006-2009 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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*/
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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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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6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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/**
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Dan
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* Our session ID
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* @var string
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*/
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6ae6e387a0e3
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private $session_id;
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6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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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 $session_data;
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6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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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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Dan
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private $code = '';
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Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
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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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Dan
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6ae6e387a0e3
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private $id = 0;
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/**
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* Constructor.
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* @param string Session ID for captcha
6ae6e387a0e3
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*/
6ae6e387a0e3
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Dan
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6ae6e387a0e3
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function __construct($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) )
6ae6e387a0e3
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Dan
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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';");
6ae6e387a0e3
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Dan
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if ( !$q )
6ae6e387a0e3
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$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(@$row['code_id']) )
6ae6e387a0e3
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Dan
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{
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throw new Exception('Row doesn\'t contain what we need (code and session_data)');
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}
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$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 = $row['code_id'];
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401
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// run any custom init functions
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if ( method_exists($this, 'construct_hook') )
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$this->construct_hook();
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}
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/**
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* Retrieves a key from the session data set
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* @param int|string Key to fetch
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* @param mixed Default value for key
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* @return mixed
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*/
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Dan
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function session_fetch($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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+ − 127
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Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
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diff
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+ − 128
/**
6ae6e387a0e3
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+ − 129
* Changes the confirmation code
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+ − 130
* @param string New string
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+ − 131
*/
1
+ − 132
401
6ae6e387a0e3
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Dan
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+ − 133
function set_code($code)
6ae6e387a0e3
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Dan
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+ − 134
{
6ae6e387a0e3
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+ − 135
if ( !is_string($code) )
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+ − 136
return false;
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 137
6ae6e387a0e3
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Dan
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+ − 138
$this->code = $code;
6ae6e387a0e3
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Dan
diff
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+ − 139
}
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 140
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 141
/**
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
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+ − 142
* Returns the confirmation code
6ae6e387a0e3
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Dan
diff
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+ − 143
* @return string
6ae6e387a0e3
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Dan
diff
changeset
+ − 144
*/
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 145
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 146
function get_code()
6ae6e387a0e3
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Dan
diff
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+ − 147
{
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
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diff
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+ − 148
return $this->code;
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
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+ − 149
}
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 150
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 151
}
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 152
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 153
/**
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
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+ − 154
* Returns a new captcha object
6ae6e387a0e3
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Dan
diff
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+ − 155
* @param string Session ID
6ae6e387a0e3
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Dan
diff
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+ − 156
* @param string Optional - engine to load
6ae6e387a0e3
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diff
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+ − 157
* @param array Optional row to send to the captcha engine
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 158
*/
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 159
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
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diff
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+ − 160
function captcha_object($session_id, $engine = false, $row = false)
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Dan
diff
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+ − 161
{
6ae6e387a0e3
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Dan
diff
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+ − 162
static $singletons = array();
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diff
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+ − 163
if ( !$engine )
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Dan
diff
changeset
+ − 164
{
6ae6e387a0e3
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Dan
diff
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+ − 165
$engine = getConfig('captcha_engine');
6ae6e387a0e3
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Dan
diff
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+ − 166
if ( !$engine )
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
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+ − 167
{
558
+ − 168
$engine = 'freecap';
1
+ − 169
}
+ − 170
}
558
+ − 171
if( !extension_loaded("gd") || !function_exists("gd_info") || !function_exists('imagettftext') || !function_exists('imagepng') || !function_exists('imagecreatefromjpeg') )
1
+ − 172
{
401
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diff
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+ − 173
$engine = 'failsafe';
1
+ − 174
}
401
6ae6e387a0e3
Implemented a new CAPTCHA API; the frontend ($session->{make,get}_captcha) is API-compatible but the backend (the captcha class) is deprecated.
Dan
diff
changeset
+ − 175
if ( !class_exists("captcha_engine_$engine") )
1
+ − 176
{
401
6ae6e387a0e3
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diff
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+ − 177
require_once ENANO_ROOT . "/includes/captcha/engine_{$engine}.php";
1
+ − 178
}
401
6ae6e387a0e3
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Dan
diff
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+ − 179
if ( !class_exists("captcha_engine_$engine") )
1
+ − 180
{
401
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diff
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+ − 181
throw new Exception("Expected but couldn't find class for captcha engine: captcha_engine_$engine");
1
+ − 182
}
401
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diff
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+ − 183
$class = "captcha_engine_$engine";
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Dan
diff
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+ − 184
return new $class($session_id, $row);
1
+ − 185
}
+ − 186
+ − 187
?>