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<?php
/**
* @package Komento
* @copyright Copyright (C) 2010 - 2018 Stack Ideas Sdn Bhd. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Komento is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
defined('_JEXEC') or die('Unauthorized Access');
require_once(__DIR__ . '/base.php');
class KomentoControllerCaptcha extends KomentoControllerBase
{
/**
* Generates the captcha image
*
* @since 3.0
* @access public
*/
public function generate()
{
$id = $this->input->get('id', 0, 'int');
// Clear expired captcha records
KT::captcha()->clear();
$table = KT::table('Captcha');
$table->load($id);
if (!$id || !$table->id) {
throw FH::exception('Invalid captcha id', 500);
}
// Generate a random integer and take only 5 chars max.
$hash = substr(md5(rand(0, 9999)), 0, 5);
$table->response = $hash;
$table->store();
// Captcha width and height
$width = 100;
$height = 20;
$image = ImageCreate($width, $height);
$white = ImageColorAllocate($image, 255, 255, 255);
$black = ImageColorAllocate($image, 0, 0, 0);
$gray = ImageColorAllocate($image, 204, 204, 204);
ImageFill( $image , 0 , 0 , $white );
ImageString( $image , 5 , 30 , 3 , $hash , $black );
ImageRectangle( $image , 0 , 0 , $width - 1 , $height - 1 , $gray );
imageline( $image , 0 , $height / 2 , $width , $height / 2 , $gray );
imageline( $image , $width / 2 , 0 , $width / 2 , $height , $gray );
// Clear the output buffer to prevent other contents messing up with the image
if (ob_get_length() !== false) {
while (@ ob_end_clean());
if (function_exists('ob_clean')) {
@ob_clean();
}
}
header('Content-type: image/jpeg');
ImageJpeg($image);
ImageDestroy($image);
exit;
}
}