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Created: Mon, Jun 30, 12:59 AM

captcha_helper.php
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	<?php
	/**
	* @version $Id: captcha_helper.php 12306 2009-08-17 02:35:55Z dmitrya $
	* @package In-Portal
	* @copyright Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
	* @license GNU/GPL
	* In-Portal is Open Source software.
	* This means that this software may have been modified pursuant
	* the GNU General Public License, and as distributed it includes
	* or is derivative of works licensed under the GNU General Public License
	* or other free or open source software licenses.
	* See http://www.in-portal.net/license/ for copyright notices and details.
	*/

	defined('FULL_PATH') or die('restricted access!');

	class kCaptchaHelper extends kHelper {

	var $width;
	var $height;

	function GenerateCaptchaCode($len = 5)
	{
	$chars = '1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
	$s = '';
	for ($i = 0; $i < $len; $i++) {
	$s .= $chars[ rand(0, strlen($chars)-1) ];
	}
	return $s;
	}

	function graphics($w, $h)
	{
	$this->width = $w;
	$this->height = $h;
	}

	function GenerateCaptchaImage($rand, $width, $height, $filter_blur = false)
	{
	global $site_font_path;
	global $site_font_validation;

	$image = imagecreate($width, $height);
	$bgColor = imagecolorallocate ($image, 255, 255, 255);
	$textColor = imagecolorallocate ($image, 0, 0, 0);

	// add random noise
	for ($i = 0; $i < 20; $i++) {
	$rx1 = rand(0, $width);
	$rx2 = rand(0, $width);
	$ry1 = rand(0, $height);
	$ry2 = rand(0, $height);
	$rcVal = rand(0, 255);
	$rc1 = imagecolorallocate($image, rand(0, 255), rand(0, 255), rand(100, 255));
	imageline($image, $rx1, $ry1, $rx2, $ry2, $rc1);
	}

	// write the random number

	$dimensions = imagettfbbox($height*0.75, 0, KERNEL_PATH.'/fonts/monofont.ttf', $rand );

	imagettftext($image, $height*0.75, 0, floor(($width - $dimensions[4])/2), floor(($height - $dimensions[5])/2), $textColor, KERNEL_PATH.'/fonts/monofont.ttf', $rand);

	// $font = imageloadfont(KERNEL_PATH.'/fonts/monofont.ttf');
	// imagestring($image, $font, 3, 0, $rand, $textColor);

	if ($filter_blur) $this->blur($image, 3);

	// send several headers to make sure the image is not cached
	// date in the past
	header("Expires: Mon, 23 Jul 1993 05:00:00 GMT");

	// always modified
	header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");

	// HTTP/1.1
	header("Cache-Control: no-store, no-cache, must-revalidate");
	header("Cache-Control: post-check=0, pre-check=0", false);

	// HTTP/1.0
	header("Pragma: no-cache");

	// send the content type header so the image is displayed properly
	header('Content-type: image/jpeg');

	imagejpeg($image);
	imagedestroy($image);
	}

	function blur(&$gdimg, $radius = 5.0)
	{
	// Taken from Torstein H�nsi's phpUnsharpMask (see phpthumb.unsharp.php)

	$radius = round(max(0, min($radius, 50)) * 2);
	if (!$radius) {
	return false;
	}

	$w = ImageSX($gdimg);
	$h = ImageSY($gdimg);
	if ($imgBlur = ImageCreateTrueColor($w, $h)) {
	// Gaussian blur matrix:
	// 1 2 1
	// 2 4 2
	// 1 2 1

	// Move copies of the image around one pixel at the time and merge them with weight
	// according to the matrix. The same matrix is simply repeated for higher radii.
	for ($i = 0; $i < $radius; $i++) {
	ImageCopy ($imgBlur, $gdimg, 0, 0, 1, 1, $w - 1, $h - 1); // up left
	ImageCopyMerge($imgBlur, $gdimg, 1, 1, 0, 0, $w, $h, 50.00000); // down right
	ImageCopyMerge($imgBlur, $gdimg, 0, 1, 1, 0, $w - 1, $h, 33.33333); // down left
	ImageCopyMerge($imgBlur, $gdimg, 1, 0, 0, 1, $w, $h - 1, 25.00000); // up right
	ImageCopyMerge($imgBlur, $gdimg, 0, 0, 1, 0, $w - 1, $h, 33.33333); // left
	ImageCopyMerge($imgBlur, $gdimg, 1, 0, 0, 0, $w, $h, 25.00000); // right
	ImageCopyMerge($imgBlur, $gdimg, 0, 0, 0, 1, $w, $h - 1, 20.00000); // up
	ImageCopyMerge($imgBlur, $gdimg, 0, 1, 0, 0, $w, $h, 16.666667); // down
	ImageCopyMerge($imgBlur, $gdimg, 0, 0, 0, 0, $w, $h, 50.000000); // center
	ImageCopy ($gdimg, $imgBlur, 0, 0, 0, 0, $w, $h);
	}
	return true;
	}
	return false;
	}

	/**
	* Generates captcha code for showing on form
	*
	* @param kEvent $event
	*/
	function prepareCode(&$event)
	{
	if ($this->Application->IsAdmin() \|\| $this->Application->RecallVar($event->getPrefixSpecial() . '_captcha_code')) {
	// when code found don't generate it 2nd time
	return ;
	}

	$this->Application->StoreVar($event->getPrefixSpecial() . '_captcha_code', $this->GenerateCaptchaCode());
	}

	/**
	* Validates captcha code on form
	*
	* @param kEvent $event
	* @param bool $check_request
	* @return bool
	*/
	function validateCode(&$event, $check_request = true)
	{
	if ($this->Application->IsAdmin()) {
	// no captcha codes in admin
	return true;
	}

	if ($check_request) {
	// perform validation only when field is found on form
	list ($id, $field_values) = each($this->Application->GetVar($event->getPrefixSpecial()));
	if (!array_key_exists('Captcha', $field_values)) {
	// when captcha code not submitted
	return true;
	}
	}

	$object =& $event->getObject();
	/* @var $object kDBItem */

	if ($object->GetDBField('Captcha') != $this->Application->RecallVar($event->getPrefixSpecial() . '_captcha_code')) {
	$object->SetError('Captcha', 'captcha_error', 'lu_captcha_error');

	$this->Application->StoreVar($event->getPrefixSpecial() . '_captcha_code', $this->GenerateCaptchaCode());
	return false;
	}

	return true;
	}
	}

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