<?php

/*

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

 * Copyright (C) 2006-2008 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.

 */

/**

 * A more complex captcha engine that relies on GD.

 * @package Enano

 * @subpackage User management

 * @copyright 2007-2008 Dan Fuhry

 * @copyright 2002-2008 phpBB Group

 */

class captcha_engine_potpourri extends captcha_base

{

  var $captcha_config;

  function __construct($sid, $r = false)

  {

    parent::__construct($sid, $r);

    $hex = Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');

    $latticecolor = '#';

    for ( $i = 0; $i < 6; $i++ )

      $latticecolor .= $hex[mt_rand(0, 15)];

    $this->captcha_config = array (

      'width' => '350',

      'height' => '90',

      'background_color' => '#E5ECF9',

      'jpeg' => '0',

      'jpeg_quality' => '95',

      'pre_letters' => '1',

      'pre_letters_great' => '0',

      'font' => '1',

      'chess' => '2',

      'ellipses' => '2',

      'arcs' => '2',

      'lines' => '2',

      'image' => '0',

      'gammacorrect' => '0.8',

      'foreground_lattice_x' => (string)mt_rand(25, 30),

      'foreground_lattice_y' => (string)mt_rand(25, 30),

      'lattice_color' => $latticecolor,

    );

  }

  function make_image()

  {

    $code = $this->get_code();

    // Prefs

    $total_width = $this->captcha_config['width'];

    $total_height = $this->captcha_config['height'];

    $hex_bg_color = $this->get_rgb($this->captcha_config['background_color']);

    $bg_color = array();

    $bg_color = explode(",", $hex_bg_color);

    $jpeg = $this->captcha_config['jpeg'];

    $img_quality = $this->captcha_config['jpeg_quality'];

    // Max quality is 95

    $pre_letters = $this->captcha_config['pre_letters'];

    $pre_letter_great = $this->captcha_config['pre_letters_great'];

    $rnd_font = $this->captcha_config['font'];

    $chess = $this->captcha_config['chess'];

    $ellipses = $this->captcha_config['ellipses'];

    $arcs = $this->captcha_config['arcs'];

    $lines = $this->captcha_config['lines'];

    $image = $this->captcha_config['image'];

    $gammacorrect = $this->captcha_config['gammacorrect'];

    $foreground_lattice_y = $this->captcha_config['foreground_lattice_y'];

    $foreground_lattice_x = $this->captcha_config['foreground_lattice_x'];

    $hex_lattice_color = $this->get_rgb($this->captcha_config['lattice_color']);

    $rgb_lattice_color = array();

    $rgb_lattice_color = explode(",", $hex_lattice_color);

    $font_debug = false;

    // Fonts and images init

    if ($image)

    {

      $bg_imgs = array();

      if ($img_dir = opendir(ENANO_ROOT.'/includes/captcha/pics/'))

      {

        while (true == ($file = @readdir($img_dir))) 

        { 

          if ((substr(strtolower($file), -3) == 'jpg') || (substr(strtolower($file), -3) == 'gif'))    

          {         

            $bg_imgs[] = $file; 

          }     

        }

        closedir($img_dir);

      }

      // Grab a random Background Image or set FALSE if none was found

      $bg_img = ( count($bg_imgs) ) ? rand(0, (count($bg_imgs)-1)) : false;

    }

    $fonts = array();

    if ($fonts_dir = opendir(ENANO_ROOT . '/includes/captcha/fonts/'))

    {

      while (true == ($file = @readdir($fonts_dir))) 

      { 

        if ((substr(strtolower($file), strlen($file)-3, strlen($file)) == 'ttf'))

        {

          $fonts[] = $file; 

        }     

      }

      closedir($fonts_dir);

    } else {

      die('Error reading directory: '.ENANO_ROOT.'/includes/captcha/fonts/');

    }

    $font = mt_rand(0, (count($fonts)-1));

    // Generate

    $image = ($this->gdVersion() >= 2) ? imagecreatetruecolor($total_width, $total_height) : imagecreate($total_width, $total_height);

    $background_color = imagecolorallocate($image, $bg_color[0], $bg_color[1], $bg_color[2]);

    imagefill($image, 0, 0, $background_color);

    // Generate backgrund

    if ($chess == '1' || $chess == '2' && rand(0,1))

    {

      // Draw rectangles

      for($i = 0; $i <= 8; $i++)

      {

        $rectanglecolor = imagecolorallocate($image, rand(100,200),rand(100,200),rand(100,200));

        imagefilledrectangle($image, 0, 0, round($total_width-($total_width/8*$i)), round($total_height), $rectanglecolor);

        $rectanglecolor = imagecolorallocate($image, rand(100,200),rand(100,200),rand(100,200));

        imagefilledrectangle($image, 0, 0, round($total_width-($total_width/8*$i)), round($total_height/2), $rectanglecolor);

      }

    }

    if ($ellipses == '1' || $ellipses == '2' && rand(0,1))

    {

      // Draw random ellipses

      for ($i = 1; $i <= 60; $i++)

      {

        $ellipsecolor = imagecolorallocate($image, rand(100,250),rand(100,250),rand(100,250));

        imagefilledellipse($image, round(rand(0, $total_width)), round(rand(0, $total_height)), round(rand(0, $total_width/8)), round(rand(0, $total_height/4)), $ellipsecolor);	

      }

    }

    if ($arcs == '1' || $arcs == '2' && rand(0,1))

    {

      // Draw random partial ellipses

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

      {

        $linecolor = imagecolorallocate($image, rand(120,255),rand(120,255),rand(120,255));

        $cx = round(rand(1, $total_width));

        $cy = round(rand(1, $total_height));

        $int_w = round(rand(1, $total_width/2));

        $int_h = round(rand(1, $total_height));

        imagearc($image, $cx, $cy, $int_w, $int_h, round(rand(0, 190)), round(rand(191, 360)), $linecolor);

        imagearc($image, $cx-1, $cy-1, $int_w, $int_h, round(rand(0, 190)), round(rand(191, 360)), $linecolor);

      }

    }

    if ($lines == '1' || $lines == '2' && rand(0,1))

    {

      // Draw random lines

      for ($i = 0; $i <= 50; $i++)

      {

        $linecolor = imagecolorallocate($image, rand(120,255),rand(120,255),rand(120,255));

        imageline($image, round(rand(1, $total_width*3)), round(rand(1, $total_height*5)), round(rand(1, $total_width/2)), round(rand(1, $total_height*2)), $linecolor);

      }

    }

    $text_color_array = array('255,51,0', '51,77,255', '204,51,102', '0,153,0', '255,166,2', '255,0,255', '255,0,0', '0,255,0', '0,0,255', '0,255,255');

    shuffle($text_color_array);

    $pre_text_color_array = array('255,71,20', '71,20,224', '224,71,122', '20,173,20', '255,186,22', '25,25,25');

    shuffle($pre_text_color_array);

    $white = imagecolorallocate($image, 255, 255, 255);

    $gray = imagecolorallocate($image, 100, 100, 100);

    $black = imagecolorallocate($image, 0, 0, 0);

    $lattice_color = imagecolorallocate($image, $rgb_lattice_color[0], $rgb_lattice_color[1], $rgb_lattice_color[2]);

    $x_char_position = (round(($total_width - 12) / strlen($code)) + mt_rand(-3, 5));

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

    {

      mt_srand((double)microtime()*1000000);

      $char = $code{$i};

      $size = mt_rand(floor($total_height / 3.5), ceil($total_height / 2.8));

      $font = ($rnd_font) ? rand(0, (count($fonts)-1)) : $font;

      $angle = mt_rand(-30, 30);

      $char_pos = array();

      $char_pos = imagettfbbox($size, $angle, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

      $letter_width = abs($char_pos[0]) + abs($char_pos[4]);

      $letter_height = abs($char_pos[1]) + abs($char_pos[5]);

      $x_pos = ($x_char_position / 4) + ($i * $x_char_position);

      ($i == strlen($code)-1 && $x_pos >= ($total_width - ($letter_width + 5))) ? $x_pos = ($total_width - ($letter_width + 5)) : '';

      $y_pos = mt_rand(($size * 1.4 ), $total_height - ($size * 0.4));

    //	Pre letters

      $size = ($pre_letter_great) ? $size + (2 * $pre_letters) : $size - (2 * $pre_letters);

      for ($count = 1; $count <= $pre_letters; $count++)

      {

        $pre_angle = $angle + mt_rand(-20, 20);

        $text_color = $pre_text_color_array[mt_rand(0,count($pre_text_color_array)-1)];

        $text_color = explode(",", $text_color);

        $textcolor = imagecolorallocate($image, $text_color[0], $text_color[1], $text_color[2]);

        imagettftext($image, $size, $pre_angle, $x_pos, $y_pos-2, $white, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

        imagettftext($image, $size, $pre_angle, $x_pos+2, $y_pos, $black, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

        imagettftext($image, $size, $pre_angle, $x_pos+1, $y_pos-1, $textcolor, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

        $size = ($pre_letter_great) ? $size - 2 : $size + 2;

      }

    //	Final letters

      $text_color = $text_color_array[mt_rand(0,count($text_color_array)-1)];

      $text_color = explode(",", $text_color);

      $textcolor = imagecolorallocate($image, $text_color[0], $text_color[1], $text_color[2]);

      imagettftext($image, $size, $angle, $x_pos, $y_pos-2, $white, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

      imagettftext($image, $size, $angle, $x_pos+2, $y_pos, $black, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

      imagettftext($image, $size, $angle, $x_pos+1, $y_pos-1, $textcolor, ENANO_ROOT.'/includes/captcha/fonts/'.$fonts[$font], $char);

    }

    ($gammacorrect) ? imagegammacorrect($image, 1.0, $gammacorrect) : '';

    // Generate a white lattice in foreground

    if ($foreground_lattice_y)

    {

      // x lines

      $ih = round($total_height / $foreground_lattice_y);

      for ($i = 0; $i <= $ih; $i++)

      {

        imageline($image, 0, $i*$foreground_lattice_y, $total_width, $i*$foreground_lattice_y, $lattice_color);

      }

    }

    if ($foreground_lattice_x)

    {

      // y lines

      $iw = round($total_width / $foreground_lattice_x);

      for ($i = 0; $i <= $iw; $i++)

      {

        imageline($image, $i*$foreground_lattice_x, 0, $i*$foreground_lattice_x, $total_height, $lattice_color);

      }

    }

    // Font debug

    if ($font_debug && !$rnd_font)

    {

      imagestring($image, 5, 2, 0, $fonts[$font], $white);

      imagestring($image, 5, 5, 0, $fonts[$font], $white);

      imagestring($image, 5, 4, 2, $fonts[$font], $gray);

      imagestring($image, 5, 3, 1, $fonts[$font], $black);

    }

    // Display

    header("Last-Modified: " . gmdate("D, d M Y H:i:s") ." GMT"); 

    header("Pragma: no-cache"); 

    header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");

    (!$jpeg) ? header("Content-Type: image/png") : header("Content-Type: image/jpeg");

    (!$jpeg) ? imagepng($image) : imagejpeg($image, '', $img_quality);

    imagedestroy($image);

  }

  // Function get_rgb by Frank Burian

  // http://www.phpfuncs.org/?content=show&id=46

  function get_rgb($hex) { 

    $hex_array = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 

        'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13, 'E' => 14, 

        'F' => 15); 

    $hex = str_replace('#', '', strtoupper($hex)); 

    if (($length = strlen($hex)) == 3) { 

        $hex = $hex{0}.$hex{0}.$hex{1}.$hex{1}.$hex{2}.$hex{2}; 

        $length = 6; 

    } 

    if ($length != 6 or strlen(str_replace(array_keys($hex_array), '', $hex))) 

        return NULL; 

    $rgb['r'] = $hex_array[$hex{0}] * 16 + $hex_array[$hex{1}]; 

    $rgb['g'] = $hex_array[$hex{2}] * 16 + $hex_array[$hex{3}]; 

    $rgb['b']= $hex_array[$hex{4}] * 16 + $hex_array[$hex{5}]; 

    return $rgb['r'].','.$rgb['g'].','.$rgb['b']; 

  }

  // Function  gdVersion by Hagan Fox

  // http://de3.php.net/manual/en/function.gd-info.php#52481

  function gdVersion($user_ver = 0)

  {

     if (! extension_loaded('gd')) { return; }

     static $gd_ver = 0;

     // Just accept the specified setting if it's 1.

     if ($user_ver == 1) { $gd_ver = 1; return 1; }

     // Use the static variable if function was called previously.

     if ($user_ver !=2 && $gd_ver > 0 ) { return $gd_ver; }

     // Use the gd_info() function if possible.

     if (function_exists('gd_info')) {

         $ver_info = gd_info();

         preg_match('/\d/', $ver_info['GD Version'], $match);

         $gd_ver = $match[0];

         return $match[0];

     }

     // If phpinfo() is disabled use a specified / fail-safe choice...

     if (preg_match('/phpinfo/', ini_get('disable_functions'))) {

         if ($user_ver == 2) {

             $gd_ver = 2;

             return 2;

         } else {

             $gd_ver = 1;

             return 1;

         }

     }

     // ...otherwise use phpinfo().

     ob_start();

     phpinfo(8);

     $info = ob_get_contents();

     ob_end_clean();

     $info = stristr($info, 'gd version');

     preg_match('/\d/', $info, $match);

     $gd_ver = $match[0];

     return $match[0];

  }

}