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File: pic.php

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  Classes of xStream  >  JSCaptcha (unvulnerable anti-bot)  >  pic.php  >  Download  
File: pic.php
Role: Auxiliary script
Content type: text/plain
Description: script to draw backend part of captcha
Class: JSCaptcha (unvulnerable anti-bot)
CAPTCHA validation using an image and JavaScript
Author: By
Last change:
Date: 7 years ago
Size: 1,443 bytes
 

Contents

Class file image Download
<?php
error_reporting
(0);
session_start();
$arr=$_SESSION['captcha'][$_GET['session']];
$img=imagecreatetruecolor(112,48);
imagefill($img,0,0,0xFFFFFF);

for(
$i=0;$i<count($arr);$i++)
{
    
$color=0;
    
ereg ("jg.drawLine\(([0-9]+), ([0-9]+), ([0-9]+), ([0-9]+)\);\n"$arr[$i], $regs);
    
$x1=$regs[1]+1;
    
$y1=$regs[2]+1;
    
$x2=$regs[3]+1;
    
$y2=$regs[4]+1;
    
imagelinethick($img$x1$y1$x2$y2$color4);
}


function 
imagelinethick($image$x1$y1$x2$y2$color$thick 1)
{
    if (
$thick == 1) {
        return 
imageline($image$x1$y1$x2$y2$color);
    }
    
$t $thick/20.5;
    if (
$x1 == $x2 || $y1 == $y2) {
        return 
imagefilledrectangle($imageround(min($x1$x2) - $t), round(min($y1$y2) - $t), round(max($x1$x2) + $t), round(max($y1$y2) + $t), $color);
    }
    
$dx=($x2 $x1) / sqrt(($x2 $x1)*($x2 $x1));
    
$dy=($y2 $y1) / sqrt(($y2 $y1)*($y2 $y1));
    
$points = array(
        
round($x1 $t*$dx), round($y1 $t*$dy),
        
round($x1 $t*$dx), round($y1 $t*$dy),
        
round($x1 $t*$dx), round($y1 $t*$dy),

        
round($x2 $t*$dx), round($y2 $t*$dy),
        
round($x2 $t*$dx), round($y2 $t*$dy),
        
round($x2 $t*$dx), round($y2 $t*$dy)
    );
    
imagefilledpolygon($image$points6$color);
    return 
imagepolygon($image$points6$color);
}

header('Content-type: image/gif');
imagegif($img);
imagedestroy($img);
?>