includes/captcha/engine_default.php
author Dan
Sun, 04 May 2008 21:57:48 -0400
changeset 541 acb7e23b6ffa
parent 536 218a627eb53e
child 685 17ebe24cdf85
permissions -rw-r--r--
Massive commit with various changes. Added user ranks system (no admin interface yet) and ability for users to have custom user titles. Made cron framework accept fractions of hours through floating-point intervals. Modifed ACL editor to use miniPrompt framework for close confirmation box. Made avatar system use a special page as opposed to fetching the files directly for caching reasons.
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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 * Version 1.1.4 (Caoineag alpha 4)
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 * Copyright (C) 2006-2008 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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}