system/helpers/captcha_helper.php

   1 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   2 /**
   3  * CodeIgniter
   4  *
   5  * An open source application development framework for PHP 5.1.6 or newer
   6  *
   7  * @package             CodeIgniter
   8  * @author              ExpressionEngine Dev Team
   9  * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
  10  * @license             http://codeigniter.com/user_guide/license.html
  11  * @link                http://codeigniter.com
  12  * @since               Version 1.0
  13  * @filesource
  14  */
  15
  16 // ------------------------------------------------------------------------
  17
  18 /**
  19  * CodeIgniter CAPTCHA Helper
  20  *
  21  * @package             CodeIgniter
  22  * @subpackage  Helpers
  23  * @category    Helpers
  24  * @author              ExpressionEngine Dev Team
  25  * @link                http://codeigniter.com/user_guide/helpers/xml_helper.html
  26  */
  27
  28 // ------------------------------------------------------------------------
  29
  30 /**
  31  * Create CAPTCHA
  32  *
  33  * @access      public
  34  * @param       array   array of data for the CAPTCHA
  35  * @param       string  path to create the image in
  36  * @param       string  URL to the CAPTCHA image folder
  37  * @param       string  server path to font
  38  * @return      string
  39  */
  40 if ( ! function_exists('create_captcha'))
  41 {
  42         function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
  43         {
  44                 $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);
  45
  46                 foreach ($defaults as $key => $val)
  47                 {
  48                         if ( ! is_array($data))
  49                         {
  50                                 if ( ! isset($$key) OR $$key == '')
  51                                 {
  52                                         $$key = $val;
  53                                 }
  54                         }
  55                         else
  56                         {
  57                                 $$key = ( ! isset($data[$key])) ? $val : $data[$key];
  58                         }
  59                 }
  60
  61                 if ($img_path == '' OR $img_url == '')
  62                 {
  63                         return FALSE;
  64                 }
  65
  66                 if ( ! @is_dir($img_path))
  67                 {
  68                         return FALSE;
  69                 }
  70
  71                 if ( ! is_writable($img_path))
  72                 {
  73                         return FALSE;
  74                 }
  75
  76                 if ( ! extension_loaded('gd'))
  77                 {
  78                         return FALSE;
  79                 }
  80
  81                 // -----------------------------------
  82                 // Remove old images
  83                 // -----------------------------------
  84
  85                 list($usec, $sec) = explode(" ", microtime());
  86                 $now = ((float)$usec + (float)$sec);
  87
  88                 $current_dir = @opendir($img_path);
  89
  90                 while ($filename = @readdir($current_dir))
  91                 {
  92                         if ($filename != "." and $filename != ".." and $filename != "index.html")
  93                         {
  94                                 $name = str_replace(".jpg", "", $filename);
  95
  96                                 if (($name + $expiration) < $now)
  97                                 {
  98                                         @unlink($img_path.$filename);
  99                                 }
 100                         }
 101                 }
 102
 103                 @closedir($current_dir);
 104
 105                 // -----------------------------------
 106                 // Do we have a "word" yet?
 107                 // -----------------------------------
 108
 109            if ($word == '')
 110            {
 111                         $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 112
 113                         $str = '';
 114                         for ($i = 0; $i < 8; $i++)
 115                         {
 116                                 $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
 117                         }
 118
 119                         $word = $str;
 120            }
 121
 122                 // -----------------------------------
 123                 // Determine angle and position
 124                 // -----------------------------------
 125
 126                 $length = strlen($word);
 127                 $angle  = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
 128                 $x_axis = rand(6, (360/$length)-16);
 129                 $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
 130
 131                 // -----------------------------------
 132                 // Create image
 133                 // -----------------------------------
 134
 135                 // PHP.net recommends imagecreatetruecolor(), but it isn't always available
 136                 if (function_exists('imagecreatetruecolor'))
 137                 {
 138                         $im = imagecreatetruecolor($img_width, $img_height);
 139                 }
 140                 else
 141                 {
 142                         $im = imagecreate($img_width, $img_height);
 143                 }
 144
 145                 // -----------------------------------
 146                 //  Assign colors
 147                 // -----------------------------------
 148
 149                 $bg_color               = imagecolorallocate ($im, 255, 255, 255);
 150                 $border_color   = imagecolorallocate ($im, 153, 102, 102);
 151                 $text_color             = imagecolorallocate ($im, 204, 153, 153);
 152                 $grid_color             = imagecolorallocate($im, 255, 182, 182);
 153                 $shadow_color   = imagecolorallocate($im, 255, 240, 240);
 154
 155                 // -----------------------------------
 156                 //  Create the rectangle
 157                 // -----------------------------------
 158
 159                 ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
 160
 161                 // -----------------------------------
 162                 //  Create the spiral pattern
 163                 // -----------------------------------
 164
 165                 $theta          = 1;
 166                 $thetac         = 7;
 167                 $radius         = 16;
 168                 $circles        = 20;
 169                 $points         = 32;
 170
 171                 for ($i = 0; $i < ($circles * $points) - 1; $i++)
 172                 {
 173                         $theta = $theta + $thetac;
 174                         $rad = $radius * ($i / $points );
 175                         $x = ($rad * cos($theta)) + $x_axis;
 176                         $y = ($rad * sin($theta)) + $y_axis;
 177                         $theta = $theta + $thetac;
 178                         $rad1 = $radius * (($i + 1) / $points);
 179                         $x1 = ($rad1 * cos($theta)) + $x_axis;
 180                         $y1 = ($rad1 * sin($theta )) + $y_axis;
 181                         imageline($im, $x, $y, $x1, $y1, $grid_color);
 182                         $theta = $theta - $thetac;
 183                 }
 184
 185                 // -----------------------------------
 186                 //  Write the text
 187                 // -----------------------------------
 188
 189                 $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
 190
 191                 if ($use_font == FALSE)
 192                 {
 193                         $font_size = 5;
 194                         $x = rand(0, $img_width/($length/3));
 195                         $y = 0;
 196                 }
 197                 else
 198                 {
 199                         $font_size      = 16;
 200                         $x = rand(0, $img_width/($length/1.5));
 201                         $y = $font_size+2;
 202                 }
 203
 204                 for ($i = 0; $i < strlen($word); $i++)
 205                 {
 206                         if ($use_font == FALSE)
 207                         {
 208                                 $y = rand(0 , $img_height/2);
 209                                 imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
 210                                 $x += ($font_size*2);
 211                         }
 212                         else
 213                         {
 214                                 $y = rand($img_height/2, $img_height-3);
 215                                 imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
 216                                 $x += $font_size;
 217                         }
 218                 }
 219
 220
 221                 // -----------------------------------
 222                 //  Create the border
 223                 // -----------------------------------
 224
 225                 imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
 226
 227                 // -----------------------------------
 228                 //  Generate the image
 229                 // -----------------------------------
 230
 231                 $img_name = $now.'.jpg';
 232
 233                 ImageJPEG($im, $img_path.$img_name);
 234
 235                 $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
 236
 237                 ImageDestroy($im);
 238
 239                 return array('word' => $word, 'time' => $now, 'image' => $img);
 240         }
 241 }
 242
 243 // ------------------------------------------------------------------------
 244
 245 /* End of file captcha_helper.php */
 246 /* Location: ./system/heleprs/captcha_helper.php */