<?php


/*

* File: CaptchaSecurityImages.php

* Author: Simon Jarvis

* Copyright: 2006 Simon Jarvis

* Date: 03/08/06

* Updated: 07/02/07

* Requirements: PHP 4/5 with GD and FreeType libraries

* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php

*

* This program is free software; you can redistribute it 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 more details:

* http://www.gnu.org/licenses/gpl.html

*

*/



define( '_JEXEC', 1 );

if(!defined('DS')){

 define('DS',DIRECTORY_SEPARATOR);

}

define( 'JPATH_BASE', realpath(dirname(__FILE__).'/../../..' ));

require_once ( JPATH_BASE .DS.'includes'.DS.'defines.php' );

require_once ( JPATH_BASE .DS.'includes'.DS.'framework.php' );

JDEBUG ? $_PROFILER->mark( 'afterLoad' ) : null;

$mainframe =  JFactory::getApplication('site');

$mainframe->initialise();

JPluginHelper::importPlugin('system');

JDEBUG ? $_PROFILER->mark('afterInitialise') : null;

$mainframe->triggerEvent('onAfterInitialise');

class CaptchaSecurityImages {

	var $font = 'monofont.ttf';

	function generateCode($characters) {

		/* list all possible characters, similar looking characters and vowels have been removed */

		$possible = '23456789bcdfghjkmnpqrstvwxyz';

		$code = '';

		$i = 0;

		while ($i < $characters) {

			$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);

			$i++;

		}

		return $code;

	}

	function CaptchaSecurityImages($width='90',$height='30',$characters='6') {

		$code = $this->generateCode($characters);

		$_SESSION['security_code_contact'] = $code;

		$app =  JFactory::getApplication();

		$app->setUserState('security_code_contact',$code);

		setcookie('security_code_contact',$code,time()+3600,'/');

		/* font size will be 75% of the image height */

		$font_size = $height * 0.75;

		$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');

		/* set the colours */

		$background_color = imagecolorallocate($image, 255, 255, 255);

		$text_color = imagecolorallocate($image, 38, 38, 38);

		$noise_color = imagecolorallocate($image, 198, 198, 198);

		/* generate random dots in background */

		for( $i=0; $i<($width*$height)/3; $i++ ) {

			imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);

		}

		/* generate random lines in background */

		for( $i=0; $i<($width*$height)/150; $i++ ) {

			imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);

		}

		/* create textbox and add text */
		$textbox = imagettfbbox($font_size, 0, JPATH_BASE.'/modules/mod_s5_quick_contact/captcha/'.$this->font, $code) or die('Error in imagettfbbox function');

		$x = ($width - $textbox[4])/2;

		$y = ($height - $textbox[5])/2;

		imagettftext($image, $font_size, 0, $x, $y, $text_color,JPATH_BASE.'/modules/mod_s5_quick_contact/captcha/'.$this->font, $code) or die('Error in imagettftext function');

		/* output captcha image to browser */

		ob_clean();

		header('Content-Type: image/jpeg');

		imagejpeg($image);

		imagedestroy($image);

	}

}

$width = isset($_GET['width']) ? $_GET['width'] : '90';

$height = isset($_GET['height']) ? $_GET['height'] : '30';

$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';

$captcha = new CaptchaSecurityImages($width,$height,$characters);

?>