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<?php
/**
*
* @package VC
* @version $Id$
* @copyright (c) 2006 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* Based on PHP-Class hn_captcha Version 1.3, released 11-Apr-2006
* Original Author - Horst Nogajski, horst@nogajski.de
*
* @package VC
*/
class captcha
{
function execute($code)
{
global $config;
$stats = gd_info();
if (substr($stats['GD Version'], 0, 7) === 'bundled')
{
$bundled = true;
}
else
{
$bundled = false;
}
preg_match('/[\\d.]+/', $stats['GD Version'], $version);
if (version_compare($version[0], '2.0.1', '>='))
{
$gd_version = 2;
}
else
{
$gd_version = 1;
}
// set dimension of image
$lx = 360;
$ly = 96;
// create the image, stay compat with older versions of GD
if ($gd_version === 2)
{
$func1 = 'imagecreatetruecolor';
$func2 = 'imagecolorallocate';
}
else
{
$func1 = 'imagecreate';
$func2 = 'imagecolorclosest';
}
$image = $func1($lx, $ly);
if ($bundled)
{
imageantialias($image, true);
}
// set background color
$back = imagecolorallocate($image, mt_rand(224, 255), mt_rand(224, 255), mt_rand(224, 255));
imagefilledrectangle($image, 0, 0, $lx, $ly, $back);
// allocates the 216 websafe color palette to the image
if ($gd_version === 1)
{
for ($r = 0; $r <= 255; $r += 51)
{
for ($g = 0; $g <= 255; $g += 51)
{
for ($b = 0; $b <= 255; $b += 51)
{
imagecolorallocate($image, $r, $g, $b);
}
}
}
}
// fill with noise or grid
if ($config['captcha_gd_noise'])
{
// random characters in background with random position, angle, color
for ($i = 0 ; $i < 72; $i++)
{
$size = mt_rand(8, 23);
$angle = mt_rand(0, 360);
$x = mt_rand(0, 360);
$y = mt_rand(0, (int)($ly - ($size / 5)));
$color = $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));
$text = chr(mt_rand(45, 250));
imagettftext($image, $size, $angle, $x, $y, $color, $this->get_font(), $text);
}
}
else
{
// generate grid
for ($i = 0; $i < $lx; $i += 13)
{
$color = $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));
imageline($image, $i, 0, $i, $ly, $color);
}
for ($i = 0; $i < $ly; $i += 11)
{
$color = $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));
imageline($image, 0, $i, $lx, $i, $color);
}
}
$len = strlen($code);
for ($i = 0, $x = mt_rand(20, 40); $i < $len; $i++)
{
$text = strtoupper($code[$i]);
$angle = mt_rand(-30, 30);
$size = mt_rand(20, 40);
$y = mt_rand((int)($size * 1.5), (int)($ly - ($size / 7)));
$color = $func2($image, mt_rand(0, 127), mt_rand(0, 127), mt_rand(0, 127));
$shadow = $func2($image, mt_rand(127, 254), mt_rand(127, 254), mt_rand(127, 254));
$font = $this->get_font();
imagettftext($image, $size, $angle, $x + (int)($size / 15), $y, $shadow, $font, $text);
imagettftext($image, $size, $angle, $x, $y - (int)($size / 15), $color, $font, $text);
$x += $size + 4;
}
// Output image
header('Content-Type: image/png');
header('Cache-control: no-cache, no-store');
imagepng($image);
imagedestroy($image);
}
function get_font()
{
static $fonts = array();
if (!sizeof($fonts))
{
global $phpbb_root_path;
$dr = opendir($phpbb_root_path . 'includes/captcha/fonts');
while (false !== ($entry = readdir($dr)))
{
if (strtolower(pathinfo($entry, PATHINFO_EXTENSION)) == 'ttf')
{
$fonts[] = $phpbb_root_path . 'includes/captcha/fonts/' . $entry;
}
}
closedir($dr);
}
return $fonts[array_rand($fonts)];
}
}
?>
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