1 <?php

     2 

     3 /*

     4  * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

     5  * Version 1.1.1 (Caoineag alpha 1)

     6  * Copyright (C) 2006-2007 Dan Fuhry

     7  * captcha.php - visual confirmation system used during registration

     8  *

     9  * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

    10  * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

    11  *

    12  * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

    13  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

    14  *

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

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

    17  */

    18 

    19 /**

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

    21  * @package Enano

    22  * @subpackage User management

    23  * @copyright 2007-2008 Dan Fuhry

    24  * @copyright Paul Sohier

    25  */

    26  

    27 class captcha_engine_default extends captcha_base

    28 {

    29   function make_image()

    30   {

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

    32     

    33     /**

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

    35       **/

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

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

    38     $breedte = 320;

    39     $hoogte = 60;

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

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

    42     

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

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

    45     {

    46       $t = $this->dss_rand();

    47       $t = $t[0];

    48           

    49       $ypos = rand(0,$hoogte);

    50       $xpos = rand(0,$breedte);

    51           

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

    53           

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

    55     } 			

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

    57     

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

    59     {

    60       

    61       

    62       $tek = $code[$j];

    63       $ypos = rand(33,43);

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

    65           

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

    67       

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

    69     }

    70       

    71     imagepng($img);

    72   }

    73   

    74   /**

    75     * Some functions :)

    76     * Also orginally written by mastercode.nl

    77     **/

    78   /**

    79     * Function to create a random color

    80     * @param $type string Mode for the color

    81     * @return int

    82     **/

    83   function color($type)

    84   {

    85     switch($type)

    86     {

    87       case "bg": 

    88         $kleur = rand(224,255); 

    89       break;

    90       case "tekst": 

    91         $kleur = rand(0,127); 

    92       break;

    93       case "bgtekst": 

    94         $kleur = rand(200,224); 

    95       break;

    96       default: 

    97         $kleur = rand(0,255); 

    98       break;

    99     }

   100     return $kleur;

   101   }

   102   /**

   103     * Function to ranom the size

   104     * @return int

   105     **/

   106   function size()

   107   {

   108     $grootte = rand(14,30);

   109     return $grootte;

   110   }

   111   /**

   112     * Function to random the posistion

   113     * @return int

   114     **/

   115   function move()

   116   {

   117     $draai = rand(-25,25);

   118     return $draai;

   119   }

   120   

   121   /**

   122     * Function to return a ttf file from fonts map

   123     * @return string

   124     **/

   125   function font()

   126   {

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

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

   129     $ar = array();

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

   131     {

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

   133       {

   134         $ar[] = $file;

   135       }

   136     }

   137     if(count($ar))

   138     {

   139       shuffle($ar);

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

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

   142     }

   143   }

   144   function dss_rand()

   145   {

   146     $val = microtime() .  mt_rand();

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

   148     return substr($val, 4, 16);

   149   }

   150 }