File: vendor/jackbooted/security/Captcha.php

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File: vendor/jackbooted/security/Captcha.php
Role: Class source
Content type: text/plain
Description: Class source
Class: JackBooted PHP Framework
Web application framework using simplified MVC
Author: By
Last change:
Date: 4 years ago
Size: 3,557 bytes
 

 

Contents

Class file image Download
<?php
namespace Jackbooted\Security;

use \
Jackbooted\Config\Cfg;
use \
Jackbooted\Forms\Request;
use \
Jackbooted\Forms\Response;
use \
Jackbooted\Html\WebPage;
use \
Jackbooted\Security\Password;
/**
 * @copyright Confidential and copyright (c) 2016 Jackbooted Software. All rights reserved.
 *
 * Written by Brett Dutton of Jackbooted Software
 * brett at brettdutton dot com
 *
 * This software is written and distributed under the GNU General Public
 * License which means that its source code is freely-distributed and
 * available to the general public.
 */

class Captcha extends WebPage {
    private
$value;
    private
$hatch;

    public function
__construct ( $value=null, $hatch=14 ) {
       
parent::__construct();
       
$this->value = ( $value == null ) ? Password::passGen ( 6, Password::UPPER_ALPHA ) : $value;
       
$this->hatch = $hatch;
    }

    public function
imageUrl () {
       
$resp = new Response ();
       
$url = Cfg::siteUrl () . '/ajax.php?' .
              
Response::factory ()
                       ->
action ( __CLASS__ . '::img()' )
                       ->
set ( '_CP1', $this->value )
                       ->
set ( '_CP4', $this->hatch )
                       ->
toUrl ( Response::UNIQUE_CSRF );

        return
$url;
    }

    public function
getValue () {
        return
$this->value;
    }

    public static function
img () {
       
header ( 'Expires: Mon, 26 Jul 1997 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/jpeg' );

       
$captchaValue = Request::get ( '_CP1' );
       
$hatch = Request::get ( '_CP4' );

       
$fontAngle = 0.0;
       
//$fontFile = dirname ( __FILE__ ) . '/fonts/luggerbu.ttf';
        //$fontFile = dirname ( __FILE__ ) . '/fonts/Alanden_.ttf';
       
$fontFile = dirname ( __FILE__ ) . '/fonts/WAVY.TTF';
       
$fontSize = 16.0;

       
$box = imagettfbbox ( $fontSize, $fontAngle, $fontFile, $captchaValue );
       
$min_x = min ( [ $box[0], $box[2], $box[4], $box[6] ] );
       
$max_x = max ( [ $box[0], $box[2], $box[4], $box[6] ] );
       
$min_y = min ( [ $box[1], $box[3], $box[5], $box[7] ] );
       
$max_y = max ( [ $box[1], $box[3], $box[5], $box[7] ] );
       
$w = ( $max_x - $min_x ) * 1.1;
       
$h = ( $max_y - $min_y ) * 1.4;

       
$im = imagecreatetruecolor ( $w, $h ) or die ( 'Cannot Initialize new GD image stream' );
       
$background_color = imagecolorallocate ( $im, 50, 50, 50 );

       
// Write the text
       
imagettftext ( $im, $fontSize, $fontAngle, 4, $h - 4, self::textColor ( $im ), $fontFile, $captchaValue );

       
// Hatch
       
for ( $i=-$h; $i<$w; $i+=$hatch ) {
           
imageline ( $im, $i, 0, $i + $h, $h, self::lineColor ( $im ) );
           
imageline ( $im, $i, $h, $i + $h, 0, self::lineColor ( $im ) );
        }

       
// Output
       
imagejpeg ( $im );
       
imagedestroy ( $im );
        exit;
    }

    private static function
lineColor ( $im ) {
       
$lo = 70;
       
$hi = 255;
        return
imagecolorallocate ( $im, rand ( $lo, $hi ), rand ( $lo, $hi ), rand ( $lo, $hi ) );
    }
    private static function
textColor ( $im ) {
       
$lo = 210;
       
$hi = 255;
        return
imagecolorallocate ( $im, rand ( $lo, $hi ), rand ( $lo, $hi ), rand ( $lo, $hi ) );
    }
}


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