WB 2.11.0

<?php

// $Id: calc_ttf_image.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

*/

if ( !defined( 'WB_PATH' ) ){ require( dirname(dirname(dirname((__DIR__)))).'/config.php' ); }

require_once(WB_PATH.'/include/captcha/captcha.php');

if(!isset($_SESSION['captcha_time']))

    exit;

//unset($_SESSION['captcha_time']);        // otherwise there can't be 2 captchas on one page!

// get lists of fonts and backgrounds

require_once(WB_PATH.'/framework/functions.php');

$t_fonts = file_list(WB_PATH.'/include/captcha/fonts');

$t_bgs = file_list(WB_PATH.'/include/captcha/backgrounds');

$fonts = array();

$bgs = array();

foreach($t_fonts as $file) { if(preg_match('/\.ttf/',$file)) { $fonts[]=$file; } }

foreach($t_bgs as $file) { if(preg_match('/\.png/',$file)) { $bgs[]=$file; } }

// Captcha

$sec_id = '';

if(isset($_GET['s'])) $sec_id = $_GET['s'];

$_SESSION['captcha'.$sec_id] = '';

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

$n = mt_rand(1,3);

switch ($n) {

    case 1:

        $x = mt_rand(1,9);

        $y = mt_rand(1,9);

        $_SESSION['captcha'.$sec_id] = $x + $y;

        $cap = "$x+$y"; 

        break; 

    case 2:

        $x = mt_rand(10,20);

        $y = mt_rand(1,9);

        $_SESSION['captcha'.$sec_id] = $x - $y; 

        $cap = "$x-$y"; 

        break;

    case 3:

        $x = mt_rand(2,10);

        $y = mt_rand(2,5);

        $_SESSION['captcha'.$sec_id] = $x * $y; 

        $cap = "$x*$y"; 

        break;

}

$text = $cap;

// choose a font and background

$font = $fonts[array_rand($fonts)];

$bg = $bgs[array_rand($bgs)];

// get image-dimensions

list($width, $height, $type, $attr) = getimagesize($bg);

// create reload-image

$reload = ImageCreateFromPNG(WB_PATH.'/include/captcha/reload_140_40.png'); // reload-overlay

if(mt_rand(0,2)==0) { // 1 out of 3

    // draw each character individualy

    $image = ImageCreateFromPNG($bg); // background image

    $grey = mt_rand(0,50);

    $color = ImageColorAllocate($image, $grey, $grey, $grey); // font-color

    $ttf = $font;

    $ttfsize = 25; // fontsize

    $count = 0;

    $image_failed = true;

    $angle = mt_rand(-10,10);

    $x = mt_rand(20,35);

    $y = mt_rand($height-10,$height-2);

    do {

        for($i=0;$i<strlen($text);$i++) {

            $res = imagettftext($image, $ttfsize, $angle, $x, $y, $color, $ttf, $text{$i});

            $angle = mt_rand(-10,10);

            $x = mt_rand($res[4],$res[4]+10);

            $y = mt_rand($height-12,$height-7);

        }

        if($res[4] > $width) {

            $image_failed = true;

        } else {

            $image_failed = false;

        }

        if(++$count > 4) // too many tries! Use the image

            break;

    } while($image_failed);

} else {

    // draw whole string at once

    $image_failed = true;

    $count=0;

    do {

        $image = ImageCreateFromPNG($bg); // background image

        $grey = mt_rand(0,50);

        $color = ImageColorAllocate($image, $grey, $grey, $grey); // font-color

        $ttf = $font;

        $ttfsize = 25; // fontsize

        $angle = mt_rand(0,5);

        $x = mt_rand(20,35);

        $y = mt_rand($height-10,$height-2);

        $res = imagettftext($image, $ttfsize, $angle, $x, $y, $color, $ttf, $text);

        // check if text fits into the image

        if(($res[0]>0 && $res[0]<$width) && ($res[1]>0 && $res[1]<$height) && 

             ($res[2]>0 && $res[2]<$width) && ($res[3]>0 && $res[3]<$height) && 

             ($res[4]>0 && $res[4]<$width) && ($res[5]>0 && $res[5]<$height) && 

             ($res[6]>0 && $res[6]<$width) && ($res[7]>0 && $res[7]<$height)

        ) {

            $image_failed = false;

        }

        if(++$count > 4) // too many tries! Use the image

            break;

    } while($image_failed);

}

imagealphablending($reload, TRUE);

imagesavealpha($reload, TRUE);

// overlay

imagecopy($reload, $image, 0,0,0,0, 140,40);

imagedestroy($image);

$image = $reload;

captcha_header();

ob_start();

imagepng($image);

header("Content-Length: ".ob_get_length()); 

ob_end_flush();

imagedestroy($image);