includes/captcha/engine_default.php
author Dan
Mon, 28 Dec 2009 16:53:19 -0500
changeset 1198 3ec9ac297045
parent 1081 745200a9cc2a
child 1227 bdac73ed481e
permissions -rw-r--r--
Fixed oversanitation of multiple XHTML closing tags in a row
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2009 Dan Fuhry
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 * captcha.php - visual confirmation system used during registration
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 *
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 * This file contains code written by Paul Sohier (www.paulscripts.nl). The CAPTCHA code was ported from the phpBB Better
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 * Captcha mod, and has been released under the GPLv2 by the original author.
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 */
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/**
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 * The default CAPTCHA engine. Generates medium-strength captchas with very good performance.
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 * @package Enano
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 * @subpackage User management
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 * @copyright 2007-2008 Dan Fuhry
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 * @copyright Paul Sohier
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 */
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class captcha_engine_default extends captcha_base
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{
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  function make_image()
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  {
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    $code =& strtoupper($this->get_code());
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    /**
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      * The next part is orginnaly written by ted from mastercode.nl and modified for use in Enano.
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      **/
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    header("content-type:image/png");
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    header('Cache-control: no-cache, no-store');
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    $breedte = 320;
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    $hoogte = 60;
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    $img = imagecreatetruecolor($breedte,$hoogte);
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    $achtergrond = imagecolorallocate($img, $this->color("bg"), $this->color("bg"), $this->color("bg"));
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    imagefilledrectangle($img, 0, 0, $breedte-1, $hoogte-1, $achtergrond);
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    for($g = 0;$g < 30; $g++)
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    {
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      $t = $this->dss_rand();
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      $t = $t[0];
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      $ypos = rand(0,$hoogte);
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      $xpos = rand(0,$breedte);
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      $kleur = imagecolorallocate($img, $this->color("bgtekst"), $this->color("bgtekst"), $this->color("bgtekst"));
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      imagettftext($img, $this->size(), $this->move(), $xpos, $ypos, $kleur, $this->font(), $t);
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    } 			
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    $stukje = $breedte / (strlen($code) + 3);
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    for($j = 0;$j < strlen($code); $j++)
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    {
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      $tek = $code[$j];
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      $ypos = rand(33,43);
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      $xpos = $stukje * ($j+1);
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      $kleur2 = imagecolorallocate($img, $this->color("tekst"), $this->color("tekst"), $this->color("tekst"));
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      imagettftext($img, $this->size(), $this->move(), $xpos, $ypos, $kleur2, $this->font() , $tek);
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    }
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    imagepng($img);
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  }
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  /**
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    * Some functions :)
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    * Also orginally written by mastercode.nl
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    **/
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  /**
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    * Function to create a random color
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    * @param $type string Mode for the color
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    * @return int
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    **/
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  function color($type)
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  {
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    switch($type)
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    {
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      case "bg": 
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        $kleur = rand(224,255); 
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      break;
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      case "tekst": 
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        $kleur = rand(0,127); 
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      break;
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      case "bgtekst": 
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        $kleur = rand(200,224); 
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      break;
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      default: 
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        $kleur = rand(0,255); 
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      break;
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    }
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    return $kleur;
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  }
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  /**
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    * Function to ranom the size
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    * @return int
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    **/
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  function size()
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  {
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    $grootte = rand(14,30);
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    return $grootte;
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  }
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  /**
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    * Function to random the posistion
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    * @return int
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    **/
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  function move()
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  {
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    $draai = rand(-25,25);
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    return $draai;
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  }
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  /**
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    * Function to return a ttf file from fonts map
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    * @return string
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    **/
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  function font()
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  {
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    $f = @opendir(ENANO_ROOT . '/includes/captcha/fonts/');
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    if(!$f) die('Can\'t open includes/captcha/fonts/ for reading');
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    $ar = array();
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    while(($file = @readdir($f)) !== false)
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    {
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      if(!in_array($file, array('.','..')) && strstr($file, '.ttf'))
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      {
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        $ar[] = $file;
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      }
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    }
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    if(count($ar))
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    {
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      shuffle($ar);
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      $i = rand(0,(count($ar) - 1));
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      return ENANO_ROOT . '/includes/captcha/fonts/' . $ar[$i];
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    }
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  }
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  function dss_rand()
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  {
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    $val = microtime() .  mt_rand();
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    $val = md5($val . 'a');
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    return substr($val, 4, 16);
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  }
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}