<?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.

 *

 * This file contains code written by Paul Sohier (www.paulscripts.nl). The CAPTCHA code was ported from the phpBB Better

 * Captcha mod, and has been released under the GPLv2 by the original author.

 */

/**

 * The default CAPTCHA engine. Generates medium-strength captchas with very good performance.

 * @package Enano

 * @subpackage User management

 * @copyright 2007-2008 Dan Fuhry

 * @copyright Paul Sohier

 */

class captcha_engine_default extends captcha_base

{

	function make_image()

	{

		$code =& strtoupper($this->get_code());

		/**

			* The next part is orginnaly written by ted from mastercode.nl and modified for use in Enano.

			**/

		header("content-type:image/png");

		header('Cache-control: no-cache, no-store');

		$breedte = 320;

		$hoogte = 60;

		$img = imagecreatetruecolor($breedte,$hoogte);

		$achtergrond = imagecolorallocate($img, $this->color("bg"), $this->color("bg"), $this->color("bg"));

		imagefilledrectangle($img, 0, 0, $breedte-1, $hoogte-1, $achtergrond);

		for($g = 0;$g < 30; $g++)

		{

			$t = $this->dss_rand();

			$t = $t[0];

			$ypos = rand(0,$hoogte);

			$xpos = rand(0,$breedte);

			$kleur = imagecolorallocate($img, $this->color("bgtekst"), $this->color("bgtekst"), $this->color("bgtekst"));

			imagettftext($img, $this->size(), $this->move(), $xpos, $ypos, $kleur, $this->font(), $t);

		} 			

		$stukje = $breedte / (strlen($code) + 3);

		for($j = 0;$j < strlen($code); $j++)

		{

			$tek = $code[$j];

			$ypos = rand(33,43);

			$xpos = $stukje * ($j+1);

			$kleur2 = imagecolorallocate($img, $this->color("tekst"), $this->color("tekst"), $this->color("tekst"));

			imagettftext($img, $this->size(), $this->move(), $xpos, $ypos, $kleur2, $this->font() , $tek);

		}

		imagepng($img);

	}

	/**

		* Some functions :)

		* Also orginally written by mastercode.nl

		**/

	/**

		* Function to create a random color

		* @param $type string Mode for the color

		* @return int

		**/

	function color($type)

	{

		switch($type)

		{

			case "bg": 

				$kleur = rand(224,255); 

			break;

			case "tekst": 

				$kleur = rand(0,127); 

			break;

			case "bgtekst": 

				$kleur = rand(200,224); 

			break;

			default: 

				$kleur = rand(0,255); 

			break;

		}

		return $kleur;

	}

	/**

		* Function to ranom the size

		* @return int

		**/

	function size()

	{

		$grootte = rand(14,30);

		return $grootte;

	}

	/**

		* Function to random the posistion

		* @return int

		**/

	function move()

	{

		$draai = rand(-25,25);

		return $draai;

	}

	/**

		* Function to return a ttf file from fonts map

		* @return string

		**/

	function font()

	{

		$f = @opendir(ENANO_ROOT . '/includes/captcha/fonts/');

		if(!$f) die('Can\'t open includes/captcha/fonts/ for reading');

		$ar = array();

		while(($file = @readdir($f)) !== false)

		{

			if(!in_array($file, array('.','..')) && strstr($file, '.ttf'))

			{

				$ar[] = $file;

			}

		}

		if(count($ar))

		{

			shuffle($ar);

			$i = rand(0,(count($ar) - 1));

			return ENANO_ROOT . '/includes/captcha/fonts/' . $ar[$i];

		}

	}

	function dss_rand()

	{

		$val = microtime() .  mt_rand();

		$val = md5($val . 'a');

		return substr($val, 4, 16);

	}

}