<?php

// $Id: captcha.php 2 2017-07-02 15:14:29Z Manuela $

/*

 Website Baker Project <http://www.websitebaker.org/>
 Copyright (C) 2004-2009, Ryan Djurovich

 Website Baker is free software; you can redistribute it 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.

 Website Baker 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 more details.

 You should have received a copy of the GNU General Public License
 along with Website Baker; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/*

Captcha generator

This file generates a captcha image.
Credits to http://php.webmaster-kit.com/ for the original code.

*/

require_once("../config.php");

if(extension_loaded('gd') AND function_exists('imageCreateFromJpeg') AND isset($_SESSION['captcha'])) {
    
    $image = imagecreate(120, 30);
    
    $white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
    $gray = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
    $darkgray = imagecolorallocate($image, 0x50, 0x50, 0x50);
    
    srand((double)microtime()*1000000);
    
    for($i = 0; $i < 30; $i++) {
        $x1 = rand(0,120);
        $y1 = rand(0,30);
        $x2 = rand(0,120);
        $y2 = rand(0,30);
        imageline($image, $x1, $y1, $x2, $y2 , $gray);  
    }
    
    $x = 0;
    for($i = 0; $i < 5; $i++) {
        $fnt = rand(3,5);
        $x = $x + rand(12 , 20);
        $y = rand(7 , 12); 
        imagestring($image, $fnt, $x, $y, substr($_SESSION['captcha'], $i, 1), $darkgray); 
    }
    
    // start buffering for size determination
    ob_start();
    // add no cache headers
    header("Expires: Mon, 1 Jan 1990 05:00:00 GMT");
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate");
    header("Cache-Control: post-check=0, pre-check=0", false);
    header("Pragma: no-cache");
    header("Content-type: image/png");
    // Make image
    imagepng($image);
    // Fetch length
    header("Content-Length: " . ob_get_length());
    // send image and turn off buffering
    ob_end_flush();
    // clear memory
    imagedestroy($image);

}

?>