includes/captcha/engine_default.php
author Dan
Wed, 26 Mar 2008 02:56:23 -0400
changeset 509 175df10e0b56
parent 507 586fd7d3202d
child 536 218a627eb53e
permissions -rw-r--r--
Added a copy of Firebug Lite for debugging purposes. License is uncertain but being treated as MPL. (If is is not MPL then it is under something more permissive that permits relicensing anyway)
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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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 * Version 1.1.3 (Caoineag alpha 3)
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 * Copyright (C) 2006-2007 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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}