<?php
/*
* Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
* Copyright (C) 2006-2009 Dan Fuhry
* captcha.php - visual confirmation system used during registration
*
* This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
*/
/**
* A more complex captcha engine that relies on GD.
* @package Enano
* @subpackage User management
* @copyright 2007-2008 Dan Fuhry
* @copyright 2002-2008 phpBB Group
*/
class captcha_engine_potpourri extends captcha_base
{
var $captcha_config;
function __construct($sid, $r = false)
{
parent::__construct($sid, $r);
$hex = Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
$latticecolor = '#';
for ( $i = 0; $i < 6; $i++ )
$latticecolor .= $hex[mt_rand(0, 15)];
$this->captcha_config = array (
'width' => '350',
'height' => '90',
'background_color' => '#E5ECF9',
'jpeg' => '0',
'jpeg_quality' => '95',
'pre_letters' => '1',
'pre_letters_great' => '0',
'font' => '1',
'chess' => '2',
'ellipses' => '2',
'arcs' => '2',
'lines' => '2',
'image' => '0',
'gammacorrect' => '0.8',
'foreground_lattice_x' => (string)mt_rand(25, 30),
'foreground_lattice_y' => (string)mt_rand(25, 30),
'lattice_color' => $latticecolor,
);
}
function make_image()
{
$code = $this->get_code();
// Prefs
$total_width = $this->captcha_config['width'];
$total_height = $this->captcha_config['height'];
$hex_bg_color = $this->get_rgb($this->captcha_config['background_color']);
$bg_color = array();
$bg_color = explode(",", $hex_bg_color);
$jpeg = $this->captcha_config['jpeg'];
$img_quality = $this->captcha_config['jpeg_quality'];
// Max quality is 95
$pre_letters = $this->captcha_config['pre_letters'];
$pre_letter_great = $this->captcha_config['pre_letters_great'];
$rnd_font = $this->captcha_config['font'];
$chess = $this->captcha_config['chess'];
$ellipses = $this->captcha_config['ellipses'];
$arcs = $this->captcha_config['arcs'];
$lines = $this->captcha_config['lines'];
$image = $this->captcha_config['image'];
$gammacorrect = $this->captcha_config['gammacorrect'];
$foreground_lattice_y = $this->captcha_config['foreground_lattice_y'];
$foreground_lattice_x = $this->captcha_config['foreground_lattice_x'];
$hex_lattice_color = $this->get_rgb($this->captcha_config['lattice_color']);
$rgb_lattice_color = array();
$rgb_lattice_color = explode(",", $hex_lattice_color);
$font_debug = false;
// Fonts and images init
if ($image)
{
$bg_imgs = array();
if ($img_dir = opendir(ENANO_ROOT.'/includes/captcha/pics/'))
{
while (true == ($file = @readdir($img_dir)))
{
if ((substr(strtolower($file), -3) == 'jpg') || (substr(strtolower($file), -3) == 'gif'))
{
$bg_imgs[] = $file;
}
}
closedir($img_dir);
}
// Grab a random Background Image or set FALSE if none was found
$bg_img = ( count($bg_imgs) ) ? rand(0, (count($bg_imgs)-1)) : false;
}
$fonts = array();
if ($fonts_dir = opendir(ENANO_ROOT . '/includes/captcha/fonts/'))
{
while (true == ($file = @readdir($fonts_dir)))
{
if ((substr(strtolower($file), strlen($file)-3, strlen($file)) == 'ttf'))
{
$fonts[] = $file;
}
}
closedir($fonts_dir);
} else {
die('Error reading directory: '.ENANO_ROOT.'/includes/captcha/fonts/');
}
$font = mt_rand(0, (count($fonts)-1));
// Generate
$image = ($this->gdVersion() >= 2) ? imagecreatetruecolor($total_width, $total_height) : imagecreate($total_width, $total_height);
$background_color = imagecolorallocate($image, $bg_color[0], $bg_color[1], $bg_color[2]);
imagefill($image, 0, 0, $background_color);
// Generate backgrund
if ($chess == '1' || $chess == '2' && rand(0,1))
{
// Draw rectangles
for($i = 0; $i <= 8; $i++)
{
$rectanglecolor = imagecolorallocate($image, rand(100,200),rand(100,200),rand(100,200));
imagefilledrectangle($image, 0, 0, round($total_width-($total_width/8*$i)), round($total_height), $rectanglecolor);
$rectanglecolor = imagecolorallocate($image, rand(100,200),rand(100,200),rand(100,200));
imagefilledrectangle($image, 0, 0, round($total_width-($total_width/8*$i)), round($total_height/2), $rectanglecolor);
}
}
if ($ellipses == '1' || $ellipses == '2' && rand(0,1))
{
// Draw random ellipses
for ($i = 1; $i <= 60; $i++)
{
$ellipsecolor = imagecolorallocate($image, rand(100,250),rand(100,250),rand(100,250));
imagefilledellipse($image, round(rand(0, $total_width)), round(rand(0, $total_height)), round(rand(0, $total_width/8)), round(rand(0, $total_height/4)), $ellipsecolor);
}
}
if ($arcs == '1' || $arcs == '2' && rand(0,1))
{
// Draw random partial ellipses
for ($i = 0; $i <= 30; $i++)
{
$linecolor = imagecolorallocate($image, rand(120,255),rand(120,255),rand(120,255));
$cx = round(rand(1, $total_width));
$cy = round(rand(1, $total_height));
$int_w = round(rand(1, $total_width/2));
$int_h = round(rand(1, $total_height));
imagearc($image, $cx, $cy, $int_w, $int_h, round(rand(0, 190)), round(rand(191, 360)), $linecolor);
imagearc($image, $cx-1, $cy-1, $int_w, $int_h, round(rand(0, 190)), round(rand(191, 360)), $linecolor);
}
}
if ($lines == '1' || $lines == '2' && rand(0,1))
{
// Draw random lines
for ($i = 0; $i <= 50; $i++)
{
$linecolor = imagecolorallocate($image, rand(120,255),rand(120,255),rand(120,255));
imageline($image, round(rand(1, $total_width*3)), round(rand(1, $total_height*5)), round(rand(1, $total_width/2)), round(rand(1, $total_height*2)), $linecolor);
}
}
$text_color_array = array('255,51,0', '51,77,255', '204,51,102', '0,153,0', '255,166,2', '255,0,255', '255,0,0', '0,255,0', '0,0,255', '0,255,255');
shuffle($text_color_array);
$pre_text_color_array = array('255,71,20', '71,20,224', '224,71,122', '20,173,20', '255,186,22', '25,25,25');
shuffle($pre_text_color_array);
$white = imagecolorallocate($image, 255, 255, 255);
$gray = imagecolorallocate($image, 100, 100, 100);
$black = imagecolorallocate($image, 0, 0, 0);
$lattice_color = imagecolorallocate($image, $rgb_lattice_color[0], $rgb_lattice_color[1], $rgb_lattice_color[2]);
$x_char_position = (round(($total_width - 12) / strlen($code)) + mt_rand(-3, 5));
for ($i = 0; $i < strlen($code); $i++)
{
mt_srand((double)microtime()*1000000);
$char = $code{$i};
$size = mt_rand(floor($total_height / 3.5), ceil($total_height / 2.8));
$font = ($rnd_font) ? rand(0, (count($fonts)-1)) : $font;
$angle = mt_rand(-30, 30);
$char_pos = array();
$char_pos = imagettfbbox($size, $angle, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
$letter_width = abs($char_pos[0]) + abs($char_pos[4]);
$letter_height = abs($char_pos[1]) + abs($char_pos[5]);
$x_pos = ($x_char_position / 4) + ($i * $x_char_position);
($i == strlen($code)-1 && $x_pos >= ($total_width - ($letter_width + 5))) ? $x_pos = ($total_width - ($letter_width + 5)) : '';
$y_pos = mt_rand(($size * 1.4 ), $total_height - ($size * 0.4));
// Pre letters
$size = ($pre_letter_great) ? $size + (2 * $pre_letters) : $size - (2 * $pre_letters);
for ($count = 1; $count <= $pre_letters; $count++)
{
$pre_angle = $angle + mt_rand(-20, 20);
$text_color = $pre_text_color_array[mt_rand(0,count($pre_text_color_array)-1)];
$text_color = explode(",", $text_color);
$textcolor = imagecolorallocate($image, $text_color[0], $text_color[1], $text_color[2]);
imagettftext($image, $size, $pre_angle, $x_pos, $y_pos-2, $white, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
imagettftext($image, $size, $pre_angle, $x_pos+2, $y_pos, $black, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
imagettftext($image, $size, $pre_angle, $x_pos+1, $y_pos-1, $textcolor, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
$size = ($pre_letter_great) ? $size - 2 : $size + 2;
}
// Final letters
$text_color = $text_color_array[mt_rand(0,count($text_color_array)-1)];
$text_color = explode(",", $text_color);
$textcolor = imagecolorallocate($image, $text_color[0], $text_color[1], $text_color[2]);
imagettftext($image, $size, $angle, $x_pos, $y_pos-2, $white, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
imagettftext($image, $size, $angle, $x_pos+2, $y_pos, $black, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
imagettftext($image, $size, $angle, $x_pos+1, $y_pos-1, $textcolor, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);
}
($gammacorrect) ? imagegammacorrect($image, 1.0, $gammacorrect) : '';
// Generate a white lattice in foreground
if ($foreground_lattice_y)
{
// x lines
$ih = round($total_height / $foreground_lattice_y);
for ($i = 0; $i <= $ih; $i++)
{
imageline($image, 0, $i*$foreground_lattice_y, $total_width, $i*$foreground_lattice_y, $lattice_color);
}
}
if ($foreground_lattice_x)
{
// y lines
$iw = round($total_width / $foreground_lattice_x);
for ($i = 0; $i <= $iw; $i++)
{
imageline($image, $i*$foreground_lattice_x, 0, $i*$foreground_lattice_x, $total_height, $lattice_color);
}
}
// Font debug
if ($font_debug && !$rnd_font)
{
imagestring($image, 5, 2, 0, $fonts[$font], $white);
imagestring($image, 5, 5, 0, $fonts[$font], $white);
imagestring($image, 5, 4, 2, $fonts[$font], $gray);
imagestring($image, 5, 3, 1, $fonts[$font], $black);
}
// Display
header("Last-Modified: " . gmdate("D, d M Y H:i:s") ." GMT");
header("Pragma: no-cache");
header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");
(!$jpeg) ? header("Content-Type: image/png") : header("Content-Type: image/jpeg");
(!$jpeg) ? imagepng($image) : imagejpeg($image, '', $img_quality);
imagedestroy($image);
}
// Function get_rgb by Frank Burian
// http://www.phpfuncs.org/?content=show&id=46
function get_rgb($hex) {
$hex_array = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13, 'E' => 14,
'F' => 15);
$hex = str_replace('#', '', strtoupper($hex));
if (($length = strlen($hex)) == 3) {
$hex = $hex{0}.$hex{0}.$hex{1}.$hex{1}.$hex{2}.$hex{2};
$length = 6;
}
if ($length != 6 or strlen(str_replace(array_keys($hex_array), '', $hex)))
return NULL;
$rgb['r'] = $hex_array[$hex{0}] * 16 + $hex_array[$hex{1}];
$rgb['g'] = $hex_array[$hex{2}] * 16 + $hex_array[$hex{3}];
$rgb['b']= $hex_array[$hex{4}] * 16 + $hex_array[$hex{5}];
return $rgb['r'].','.$rgb['g'].','.$rgb['b'];
}
// Function gdVersion by Hagan Fox
// http://de3.php.net/manual/en/function.gd-info.php#52481
function gdVersion($user_ver = 0)
{
if (! extension_loaded('gd')) { return; }
static $gd_ver = 0;
// Just accept the specified setting if it's 1.
if ($user_ver == 1) { $gd_ver = 1; return 1; }
// Use the static variable if function was called previously.
if ($user_ver !=2 && $gd_ver > 0 ) { return $gd_ver; }
// Use the gd_info() function if possible.
if (function_exists('gd_info')) {
$ver_info = gd_info();
preg_match('/\d/', $ver_info['GD Version'], $match);
$gd_ver = $match[0];
return $match[0];
}
// If phpinfo() is disabled use a specified / fail-safe choice...
if (preg_match('/phpinfo/', ini_get('disable_functions'))) {
if ($user_ver == 2) {
$gd_ver = 2;
return 2;
} else {
$gd_ver = 1;
return 1;
}
}
// ...otherwise use phpinfo().
ob_start();
phpinfo(8);
$info = ob_get_contents();
ob_end_clean();
$info = stristr($info, 'gd version');
preg_match('/\d/', $info, $match);
$gd_ver = $match[0];
return $match[0];
}
}