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<?php
/**
* $Id: Captcha.php,v 1.11.2.1 2007-05-28 11:34:30 thorstenr Exp $
*
* The phpMyFAQ Captcha class
*
* @author Thomas Zeithaml <seo@annatom.de>
* @author Thorsten Rinne <thorsten@phpmyfaq.de>
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
* @since 2006-02-04
* @copyright (c) 2006-2007 phpMyFAQ Team
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*/
class PMF_Captcha
{
/**
* The database handle
*
* @var mixed
*/
var $db;
/**
* The phpMyFAQ session id
*
* @var string
*/
var $sids;
/**
* Array of fonts
*
* @var array
*/
var $fonts = array();
/**
* The captcha code
*
* @var string
*/
var $code;
/**
* Array of characters
*
* @var array
*/
var $letters;
/**
* Length of the captcha code
*
* @var integer
*/
var $caplength;
/**
* Width of the image
*
* @var integer
*/
var $width;
/**
* Height of the image
*
* @var integer
*/
var $height;
/**
* JPEG quality in percents
*
* @var integer
*/
var $quality;
/**
* Random background color RGB components
*
* @var array
*/
var $_backgroundColor;
/**
* Generated image
*
* @var resource
*/
var $img;
/**
* The user agent language
*
* @var string
*/
var $language;
/**
* The user agent string
*
* @var string
*/
var $userAgent;
/**
* Timestamp
*
* @var integer
*/
var $timestamp;
/**
* Constructor
*
* @param object $db
* @param string $sids
* @param string $language
* @param integer $caplength
* @return void
* @author Thomas Zeithaml <seo@annatom.de>
* @author Thorsten Rinne <thorsten@phpmyfaq.de>
*/
function PMF_Captcha($db, $sids, $language, $caplength = 6)
{
$this->db =& $db;
if ($sids > 0) {
$this->sids = $sids;
} else {
$this->sids = '';
}
$this->language = $language;
$this->userAgent = $_SERVER['HTTP_USER_AGENT'];
$this->ip = $_SERVER['REMOTE_ADDR'];
$this->caplength = $caplength;
$this->letters = array('1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' );
$this->code = '';
$this->quality = 60;
$this->fonts = $this->getFonts();
$this->width = 200;
$this->height = 40;
$this->timestamp = time();
}
//
// public functions
//
/**
* Gives the HTML output code for the Captcha
*
* @param string The action parameter
* @return string
* @access public
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
* @author Thorsten Rinne <thorsten@phpmyfaq.de>
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function printCaptcha($action)
{
$output = sprintf(
'<img src="%s?%saction=%s&gen=img&ck=%s" height="%d" width="%d" border="0" alt="Chuck Norris has counted to infinity. Twice." title="Chuck Norris has counted to infinity. Twice." />',
$_SERVER['PHP_SELF'],
$this->sids,
$action,
time(),
$this->height,
$this->width);
return $output;
}
/**
* Draw the Captcha
*
* @return void
* @access public
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
*/
function showCaptchaImg()
{
$this->createBackground();
$this->drawlines();
$this->generateCaptchaCode($this->caplength);
$this->drawText();
if (function_exists('imagepng')) {
header('Content-Type: image/png');
imagepng($this->img);
} elseif (function_exists('imagejpeg')) {
header('Content-Type: image/jpeg');
imagejpeg($this->img, '', ( int )$this->quality);
} elseif (function_exists('imagegif')) {
header('Content-Type: image/gif');
imagegif($this->img);
}
imagedestroy($this->img);
}
/**
* Gets the Captcha from the DB
*
* @return string
* @access public
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
*/
function getCaptchaCode()
{
$query = "SELECT id FROM ".SQLPREFIX."faqcaptcha";
$result = $this->db->query($query);
while ($row = $this->db->fetch_assoc($result)) {
$this->code = $row['id'];
}
return $this->code;
}
//
// private functions
//
/**
* Draw random lines
*
* @return img
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
*/
function drawlines()
{
$color1 = rand(150, 185);
$color2 = rand(185, 225);
$nextline = 4;
$w1 = 0;
$w2 = 0;
for ($x = 0; $x < $this->width; $x += (int)$nextline) {
if ($x < $this->width) {
imageline($this->img, $x + $w1, 0, $x + $w2, $this->height - 1, rand($color1, $color2));
}
if ($x < $this->height) {
imageline($this->img, 0, $x - $w2, $this->width - 1, $x - $w1, rand($color1, $color2));
}
if (function_exists('imagettftext') && (count($this->fonts) > 0)) {
$nextline += rand(-5, 7);
if ($nextline < 1) {
$nextline = 2;
}
}
else {
$nextline += rand(1, 7);
}
$w1 += rand(-4, 4);
$w2 += rand(-4, 4);
}
return $this->img;
}
/**
* Draw the Text
*
* @return img
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function drawText()
{
$len = strlen($this->code);
$w1 = 15;
$w2 = $this->width / ($len + 1);
for ($p = 0; $p < $len; $p++) {
$letter = $this->code[$p];
if (count($this->fonts) > 0) {
$font = $this->fonts[rand(0, count($this->fonts) - 1)];
}
$size = rand(20, $this->height / 2.2);
$rotation = rand(-23, 23);
$y = rand($size + 3, $this->height-5);
// $w1 += rand(- $this->width / 90, $this->width / 40 );
$x = $w1 + $w2*$p;
$c1 = array(); // fore char color
$c2 = array(); // back char color
do {
$c1['r'] = mt_rand(30, 199);
} while ($c1['r'] == $this->_backgroundColor['r']);
do {
$c1['g'] = mt_rand(30, 199);
} while ($c1['g'] == $this->_backgroundColor['g']);
do {
$c1['b'] = mt_rand(30, 199);
} while ($c1['b'] == $this->_backgroundColor['b']);
$c1 = imagecolorallocate($this->img, $c1['r'], $c1['g'], $c1['b']);
do {
$c2['r'] = ($c1['r'] < 100 ? $c1['r'] * 2 : mt_rand(30, 199));
} while (($c2['r'] == $this->_backgroundColor['r']) && ($c2['r'] == $c1['r']));
do {
$c2['g'] = ($c1['g'] < 100 ? $c1['g'] * 2 : mt_rand(30, 199));
} while (($c2['g'] == $this->_backgroundColor['g']) && ($c2['g'] == $c1['g']));
do {
$c2['b'] = ($c1['b'] < 100 ? $c1['b'] * 2 : mt_rand(30, 199));
} while (($c2['b'] == $this->_backgroundColor['b']) && ($c2['b'] == $c1['b']));
$c2 = imagecolorallocate($this->img, $c2['r'], $c2['g'], $c2['b']);
// Add the letter
if (function_exists('imagettftext') && (count($this->fonts) > 0)) {
imagettftext($this->img, $size, $rotation, $x + 2, $y, $c2, $font, $letter);
imagettftext($this->img, $size, $rotation, $x + 1, $y + 1, $c2, $font, $letter);
imagettftext($this->img, $size, $rotation, $x, $y-2, $c1, $font, $letter);
} else {
$size = 5;
$c3 = imagecolorallocate($this->img, 0, 0, 255);
$x = 20;
$y = 12;
$s = 30;
imagestring($this->img, $size, $x + 1 + ($s * $p), $y+1, $letter, $c3);
imagestring($this->img, $size, $x + ($s * $p), $y, $letter, $c1);
}
}
return $this->img;
}
/**
* Create the background
*
* @return resource
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
*/
function createBackground()
{
$this->img = imagecreate($this->width, $this->height);
$this->_backgroundColor['r'] = rand(220, 255);
$this->_backgroundColor['g'] = rand(220, 255);
$this->_backgroundColor['b'] = rand(220, 255);
$colorallocate = imagecolorallocate($this->img, $this->_backgroundColor['r'], $this->_backgroundColor['g'], $this->_backgroundColor['b']);
imagefilledrectangle($this->img, 0, 0, $this->width, $this->height, $colorallocate);
return $this->img;
}
/**
* Generate a Captcha Code
*
* @param int $caplength
* @return string
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function generateCaptchaCode($caplength)
{
// Start garbage collector for removing old (==unresolved) captcha codes
// Note that we would like to avoid performing any garbaging of old records
// because these data could be used as a database for collecting ip addresses,
// eventually organizing them in subnetwork addresses, in order to use
// them as an input for PMF IP banning.
// This because we always perform these 3 checks on the public forms
// in which captcha code feature is attached:
// 1. Check against IP/Network address
// 2. Check against banned words
// 3. Check against the captcha code
// so you could ban those "users" at the address level (1.).
// If you want to look over your current data you could use this SQL query below:
// SELECT DISTINCT ip, useragent, COUNT(ip) AS times
// FROM faqcaptcha
// GROUP BY ip
// ORDER BY times DESC
// to find out *bots and human attempts
$this->garbageCollector();
// Create the captcha code
for ($i = 1; $i <= $caplength; $i++) {
$j = floor(rand(0,34));
$this->code .= $this->letters[$j];
}
if (!$this->saveCaptcha()) {
return $this->generateCaptchaCode($caplength);
}
return $this->code;
}
/**
* Save the Captcha
*
* @return bool
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function saveCaptcha()
{
if ($result = $this->db->query("SELECT id FROM ".SQLPREFIX."faqcaptcha WHERE id = '".$this->code."'")) {
$num = $this->db->num_rows($result);
if ($num > 0) {
return false;
} else {
$query = sprintf("INSERT INTO %sfaqcaptcha (id, useragent, language, ip, captcha_time) VALUES ('%s', '%s', '%s', '%s', %d)", SQLPREFIX, $this->code, $this->userAgent, $this->language, $this->ip, $this->timestamp);
$this->db->query( $query );
return true;
}
}
return false;
}
/**
* Remove the Captcha
*
* @return void
* @access private
* @since 2006-02-18
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function removeCaptcha($captchaCode = null)
{
if ($captchaCode == null) {
$captchaCode = $this->code;
}
$query = sprintf("DELETE FROM %sfaqcaptcha WHERE id = '%s'", SQLPREFIX, $captchaCode);
$this->db->query($query);
}
/**
* Validate the Captcha
*
* @param string $captchaCode
* @return void
* @access private
* @since 2006-02-18
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function validateCaptchaCode($captchaCode)
{
$captchaCode = strtoupper($captchaCode);
// Help the user: treat "0" (ASCII 48) like "O" (ASCII 79)
// if "0" is not in the realm of captcha code letters
if (!in_array("0", $this->letters)) {
$captchaCode = str_replace("0", "O", $captchaCode);
}
// Sanity check
for ($i = 0; $i < strlen( $captchaCode ); $i++) {
if (!in_array($captchaCode[$i], $this->letters)) {
return false;
}
}
// Search for this Captcha in the db
$query = sprintf("
SELECT
id
FROM
%sfaqcaptcha
WHERE
id = '%s'",
SQLPREFIX,
$this->db->escape_string($captchaCode));
if ($result = $this->db->query($query)) {
$num = $this->db->num_rows($result);
if ($num > 0) {
$this->code = $captchaCode;
$this->removeCaptcha($captchaCode);
return true;
}
}
return false;
}
/**
* Delete old captcha records.
*
* During normal use the <b>faqcaptcha</b> table would be empty, on average:
* each record is created when a captcha image is showed to the user
* and deleted upon a successful matching, so, on average, a record
* in this table is probably related to a spam attack.
*
* @param int the time (sec) to define a captcha code old and ready to be deleted (default: 1 week)
* @return void
* @access private
* @since 2006-03-25
* @author Matteo Scaramuccia <matteo@scaramuccia.com>
*/
function garbageCollector($time = 604800)
{
$query = sprintf("DELETE FROM %sfaqcaptcha WHERE captcha_time < %d", SQLPREFIX, time() - $time);
$this->db->query($query);
}
/**
* Get Fonts
*
* @return array
* @access private
* @since 2006-02-02
* @author Thomas Zeithaml <info@spider-trap.de>
*/
function getFonts()
{
return glob(dirname(dirname(__FILE__)).'/font/*.ttf');
}
}
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