View file veppa_wallpaper/sys/helpers/Vimage.php

<?php
/**
 * Free Wallpaper Script
 *
 * Free Wallpaper Script by Vepa Halliyev is licensed under a Creative Commons Attribution-Share Alike 3.0 License.
 *
 * @package		Free Wallpaper Script
 * @author		Vepa Halliyev
 * @copyright	Copyright (c) 2009, Vepa Halliyev, veppa.com.
 * @license		http://www.veppa.com/free-wallpaper-script/
 * @link		http://www.veppa.com/free-wallpaper-script/
 * @since		Version 1.0
 * @filesource
 */
/*
include("vImage.php");
$vImage = new vImage();

## code input name must be 'vImageCodP'. it is used to check validity  




==================================
### Display code input in form
==================================

<tr>
    <td><label for="vImageCodP">'.__('Security code').'</label></td>
    <td>
    
    <table width="100%" border="0" cellpadding="0" cellspacing="0">
		<tr>
			<td width="65" valign="top"> <input size="3" maxlength="4" type="text" name="vImageCodP" /></td>
			<td valign="top"><img src="'.get_url('login/securityImage/'.REQUEST_TIME.'/').'" /></td>
		</tr>
	</table>
    '.View::validation()->vImageCodP_error.'		    
    </td>
  </tr>


===================================
### Validate code using validation class
===================================
$vImage->_validate_security_code()


===================================
### Manual check code validity 
===================================
if ($vImage->checkCode()) {
	echo "code true";
}else{
	echo "code false";
			
}


===================================
### generate code and display jpg image
===================================
use_helper('Vimage');
$vImage = new Vimage();
$vImage->genText(4);
$vImage->showimage();



*/


class Vimage{
	var $numChars = 3; 
	var $w; 
	var $h = 20; 
	var $colBG = "231 249 234";
	var $colTxt = "0 0 0";
	var $colBorder = "000 000 000";
	var $charx = 30;  
	var $numCirculos = 10; 
	var $securityCode = 'iuyhgsdnvlksvhnkyj1ht2387n!$%^&$*%^(*$EWRAWSDFGDXzxvxfghtfy"£$%^&*(^%'; 
	
	
	function Vimage(){
		//session_start();
	}
	
	function genText($num){
		
		if (($num != '')&&($num > $this->numChars)) $this->numChars = $num;		
		
		$this->texto = $this->genString();
		
		//$_SESSION['vImageCodS'] = $this->texto;
		$this->saveCode($this->texto);
	}
	
	function saveCode($code)
	{
		$c['md5_code'] = $this->_bakeCode($code);
		$c['exp'] = $_SERVER['REQUEST_TIME']+3600;
		
		Flash::setCookie('vImageCodS',serialize($c),0);
	}
	
	function loadCodes()
	{
		$this->postCode = $_POST['vImageCodP'];
		//$this->sessionCode = $_SESSION['vImageCodS'];
		
		$c = unserialize(Flash::getCookie('vImageCodS'));
		
		if($c['exp'] > $_SERVER['REQUEST_TIME'])
		{
			$this->sessionCode = $c['md5_code'];
		}
		else
		{
			$this->sessionCode = false;		
		}
		// cod kullanildi silmek gerekiyor
		Flash::clearCookie('vImageCodS');
	}
	
	function checkCode()
	{
		if (!isset($this->postCode))
		{ 
			$this->loadCodes();
		}
		if ($this->_bakeCode($this->postCode) === $this->sessionCode)
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	
	function showCodBox($echo=false,$extra='')
	{
		$str = '<input size="3" maxlength="4" type="text" name="vImageCodP" '.$extra.' /> ';
		
		if ($echo)
		{
			echo $str;
		}
		else
		{
			return $str;
		}
	}
	
	function showImage($chars=3)
	{
		$this->genImage();
		
		header("Content-type: image/png");
		ImagePng($this->im);
	}
	
	function genImage()
	{
		$this->w = ($this->numChars * $this->charx) + 10; 
		
		$this->im = imagecreatetruecolor($this->w, $this->h); 
		
		imagefill( $this->im, 0, 0, $this->getColor($this->colBorder));
		imagefilledrectangle ( $this->im, 1, 1, ($this->w-2), ($this->h-2), $this->getColor($this->colBG) );

		
		// add circles
		for ($i=1;$i<=$this->numCirculos;$i++) 
		{
			$randomcolor = imagecolorallocate ($this->im , rand(100,255), rand(100,255),rand(100,255));
			imageellipse($this->im,rand(0,$this->w-10),rand(0,$this->h-3), rand(20,60),rand(20,60),$randomcolor);
		}

		
		$ident = 20;
		for ($i=0;$i<$this->numChars;$i++)
		{
			$char = substr($this->texto, $i, 1);
			$font = 14;
			$y = round(($this->h-15)/2);
			$col = $this->getColor($this->colTxt);
			
			if (($i%2) == 0){
				imagechar ( $this->im, $font, $ident, $y, $char, $col );
			}else{
				imagechar ( $this->im, $font, $ident, $y, $char, $col );
				//imagecharup ( $this->im, $font, $ident, $y+10, $char, $col );
			}
			$ident = $ident+$this->charx;
		}
	}
	
	function getColor($var)
	{
		$rgb = explode(" ",$var);
		$col = imagecolorallocate ($this->im, $rgb[0], $rgb[1], $rgb[2]);
		return $col;
	}
	
	function genString(){
		//rand(0,time());
		//$possible="AGHacefhjkrStVxY124579";
		$possible="0123456789";
		while(strlen($str) < $this->numChars)
		{
			$str .= substr($possible, (rand()%(strlen($possible))), 1);
		}

		return $str;
	}
	
	function _validate_security_code($str)
	{
		// check security image
		
		if($this->checkCode())
		{
			return true;
		}
		else
		{
			$validation = Validation::getInstance();
			$validation->set_message('_validate_security_code', 'The %s is not valid');
			return false;
		}
	} 
	
	
	function _bakeCode($code)
	{
		return md5(md5($code).$this->securityCode);
	}
} 

?>