<?php
/*
PHP Captcha by Codepeople.net
http://www.codepeople.net
*/

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

if (!ini_get("zlib.output_compression")) ob_clean();

header("Cache-Control: no-store, no-cache, must-revalidate");
header("Pragma: no-cache");    

if (!isset($_GET["ps"])) $_GET["ps"] = '';
if (!isset($_GET["bcolor"]) || $_GET["bcolor"] == '') $_GET["bcolor"] = "FFFFFF";
if (!isset($_GET["border"]) || $_GET["border"] == '') $_GET["border"] = "000000";

//configuration
$imgX = ( isset($_GET["width"]) && is_numeric( $_GET["width"] ) )? intval($_GET["width"]) : "180" ; 
$imgY = ( isset($_GET["height"]) && is_numeric( $_GET["height"] ) )? intval($_GET["height"]) : "60" ;

$letter_count = ( isset($_GET["letter_count"]) && is_numeric( $_GET["letter_count"] ) )? intval($_GET["letter_count"]) : "5";
$min_size = ( isset($_GET["min_size"]) && is_numeric( $_GET["min_size"] ) )? intval($_GET["min_size"]) : "35"; 
$max_size = ( isset($_GET["max_size"]) && is_numeric( $_GET["max_size"] ) )? intval($_GET["max_size"]) : "45"; 
$noise = ( isset($_GET["noise"]) && is_numeric( $_GET["noise"] ) )? intval($_GET["noise"]) : "200"; 
$noiselength = ( isset($_GET["noiselength"]) && is_numeric( $_GET["noiselength"] ) )? intval($_GET["noiselength"]) : "5"; 
$bcolor = cpcff_decodeColor(sanitize_text_field($_GET["bcolor"]));  
$border = cpcff_decodeColor(sanitize_text_field($_GET["border"]));  

$noisecolor = 0xcdcdcd;         
$random_noise_color= true;      
$tcolor = cpcff_decodeColor("666666"); 
$random_text_color= true;                                
                                               
function cpcff_decodeColor($hexcolor)
{
   $color = hexdec($hexcolor);
   $c["b"] = $color % 256;
   $color = $color / 256;
   $c["g"] = $color % 256;
   $color = $color / 256;
   $c["r"] = $color % 256;
   return $c;
}

function cpcff_similarColors($c1, $c2)
{
   return sqrt( pow($c1["r"]-$c2["r"],2) + pow($c1["g"]-$c2["g"],2) + pow($c1["b"]-$c2["b"],2)) < 125;
}

if (function_exists('session_start')) @session_start();

function cpcff_make_seed() {
    list($usec, $sec) = explode(' ', microtime());
    return (float) $sec + ((float) $usec * 100000);
}
mt_srand(cpcff_make_seed());
$randval = mt_rand();

$str = "";
$length = 0;
for ($i = 0; $i < $letter_count; $i++) {
	 $str .= chr(mt_rand(97, 122))." ";
}
$_SESSION['rand_code'.sanitize_key($_GET["ps"])] = str_replace(" ", "", $str);

$uidt = uniqid();

set_transient( "ahb-captcha-".$uidt , str_replace(" ", "", $str) , 1800 );

setCookie('rand_code'.sanitize_key($_GET["ps"]), $uidt, time()+36000,"/");

$image = imagecreatetruecolor($imgX, $imgY);
$backgr_col = imagecolorallocate($image, $bcolor["r"],$bcolor["g"],$bcolor["b"]);
$border_col = imagecolorallocate($image, $border["r"],$border["g"],$border["b"]);

if ($random_text_color)
{
  do 
  {
     $selcolor = mt_rand(0,256*256*256);
  } while ( cpcff_similarColors(cpcff_decodeColor($selcolor), $bcolor) );
  $tcolor = cpcff_decodeColor($selcolor);
}    

$text_col = imagecolorallocate($image, $tcolor["r"],$tcolor["g"],$tcolor["b"]);
    
imagefilledrectangle($image, 0, 0, $imgX, $imgY, $backgr_col);
imagerectangle($image, 0, 0, $imgX-1, $imgY-1, $border_col);
for ($i=0;$i<$noise;$i++)
{
  if ($random_noise_color)
      $color = mt_rand(0, 256*256*256);
  else
      $color = $noisecolor;
  $x1 = mt_rand(2,$imgX-2);
  $y1 = mt_rand(2,$imgY-2);
  imageline ( $image, $x1, $y1, mt_rand($x1-$noiselength,$x1+$noiselength), mt_rand($y1-$noiselength,$y1+$noiselength), $color);
}  

if (empty($_GET["font"]))
    $selected_font = "font-1.ttf";
else
{  
    switch ($_GET["font"]) {
        case "font-2.ttf":
        case "font2":
            $selected_font = "font-2.ttf";
            break;
        case "font-3.ttf":
        case "font3":
            $selected_font = "font-3.ttf";
            break;
        case "font-4.ttf":
        case "font4":
            $selected_font = "font-4.ttf";
            break;               
        default:
            $selected_font = "font-1.ttf";    
    }
}
 
$font = dirname( __FILE__ ) . "/". $selected_font;

$font_size = rand($min_size, $max_size);
  
$angle = rand(-15, 15);

if (function_exists("imagettfbbox") && function_exists("imagettftext"))
{
    $box = imagettfbbox($font_size, $angle, $font, $str);
    $x = (int)($imgX - $box[4]) / 2;
    $y = (int)($imgY - $box[5]) / 2;
    imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $str);
} 
else if (function_exists("imageFtBBox") && function_exists("imageFTText"))
{
    $box = imageFtBBox($font_size, $angle, $font, $str);
    $x = (int)($imgX - $box[4]) / 2;
    $y = (int)($imgY - $box[5]) / 2;
    imageFTText ($image, $font_size, $angle, $x, $y, $text_col, $font, $str);	
}
else
{
    $angle = 0;
    $font = 6;
    $wf = ImageFontWidth(6) * strlen($str); 
    $hf = ImageFontHeight(6);
    $x = (int)($imgX - $wf) / 2;
    $y = (int)($imgY - $hf) / 2;
    imagestring ( $image, $font, $x, $y, $str, $text_col);	
}

header("Content-type: image/png");
imagepng($image);
imagedestroy ($image);
exit;