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<?php
/**
* This file provides the EasyCaptcha class
* @version $Id: class.easycaptcha.php 656 2008-04-05 09:17:38Z snipersister $
* @package EasyCaptcha
* @license Released under the terms of the GNU General Public License (see LICENSE.php in the Joomla! root directory)
* @author EasyJoomla.org - Project
**/
defined('_JEXEC') or die('Restricted access');
// Define includepath
defined('ABSOLUTEPATH') or define( 'ABSOLUTEPATH', dirname(__FILE__) );
/**
* EasyCaptcha, a class which provides the possibility to include a captcha image in 3rd-party extensions.
* The class is developed to be used inside extensions for the Joomla! CMS version 1.5.x
* @package EasyCaptcha
* @author David Jardin
* @copyright David Jardin
**/
class EasyCaptcha
{
/**
* @var object Captcha parameters
*/
var $_captcha_params;
/**
* @var string Captcha name
*/
var $captcha_name;
/**
* @var integer Captcha id
*/
var $captcha_id;
/**
* @var string Captcha alternative text
*/
var $alt_text;
/**
* @var string Captcha image url
*/
var $image_url;
/**
* @var string Correct, md5 hashed value of the captcha
*/
var $captcha_val;
/**
* Constructur
* @param integer $captcha_id ID of the generated captcha
**/
function easyCaptcha( $captcha_id=0 )
{
$this->getCaptchaName();
$this->getCaptchaParams();
$this->setCaptchaId( $captcha_id );
$this->setAltText();
$this->setImageUrl();
$this->_getLanguage();
}
/**
* Sets the ID of the generated captcha
* @param integer $captcha_id Captcha ID which should be set
**/
function setCaptchaId( $captcha_id )
{
if(!is_numeric($captcha_id) || $captcha_id == "0")
{
mt_srand((double)microtime()*1000000);
$captcha_id = mt_rand($this->_captcha_params->random_min,$this->_captcha_params->random_max);
}
$this->captcha_id = $captcha_id;
}
/**
* Sets alternative Text of the image
* @access private
**/
function setAltText()
{
if(isset($this->_captcha_params->AltTextFile) && $this->_captcha_params->AltTextFile == 1)
{
if(file_exists(ABSOLUTEPATH.DS."captchas".DS.$this->captcha_name.DS."alt.php")){
include_once(ABSOLUTEPATH.DS."captchas".DS.$this->captcha_name.DS."alt.php");
$this->alt_text = altText($this->captcha_id);
}
else
{
$this->alt_text = "Captcha Image";
}
}
else
{
$this->alt_text = "Captcha Image";
}
}
/**
* Sets the url of the captcha image
* @access private
**/
function setImageUrl()
{
$this->image_url = JURI::base()."components/com_easycaptcha/captchas/".$this->captcha_name."/captcha.php?captcha_id=".$this->captcha_id;
}
/**
* Checks whether the user-entered code is correct
* @param string $entered_code User-Entered code
* @return bool Was entered Code correct or not
**/
function checkEnteredCode($entered_code)
{
$this->getCodeVal();
$entered_code = md5(strtolower($entered_code));
if($entered_code == $this->captcha_val)
{
return true;
}
else
{
return false;
}
}
/**
* Reads captcha parameters out of the database
* @return object Parameters of active captcha
* @access private
*/
function getCaptchaParams()
{
$db =& JFactory::getDBO();
$registry = new JRegistry();
$db->setQuery("SELECT params FROM #__easycaptchas WHERE published = '1' LIMIT 1");
$captcha_params = $db->loadResult();
$registry->loadINI( $captcha_params );
$this->_captcha_params = $registry->toObject( );
}
/**
* Reads captcha name out of the database
* @return string Name of active captcha
*/
function getCaptchaName()
{
$db =& JFactory::getDBO();
$db->setQuery("SELECT name FROM #__easycaptchas WHERE published = '1' LIMIT 1");
$this->captcha_name = $db->loadResult();
}
/**
* Gets the md5-encoded, correct value of the captcha
* @return string Correct Value of the captcha (md5 encoded)
* @access private
*/
function getCodeVal()
{
include_once(ABSOLUTEPATH.DS."captchas".DS.$this->captcha_name.DS."validate.php");
$this->captcha_val = getCode($this->captcha_id);
return $this->captcha_val;
}
/**
* Gets the captcha ID
* @return integer Captcha ID
*/
function getCaptchaId()
{
return $this->captcha_id;
}
/**
* Gets the reload javascript
* @return text Reload Javascript
*/
function getReloadCode()
{
include_once(ABSOLUTEPATH.DS."captchas".DS.$this->captcha_name.DS."reload.php");
return reloadCode($this);
}
/**
* Gets the reload button
* @param string $id HTML elementId of the captcha image
* @param string $image Imagesrc to an image which should be used as button
* @return text Reload Button
*/
function getReloadButton($id, $image=null)
{
include_once(ABSOLUTEPATH.DS."captchas".DS.$this->captcha_name.DS."reload.php");
return reloadButton($id, $image);
}
/**
* Gets the alternative text of the captcha-image
* @return string Alternative text of captcha image
*/
function getAltText()
{
return $this->alt_text;
}
/**
* Generates Javascript code needed for AJAX Support
* @param string $onComplete Name of the JS Function which should be called after retriving the result of the request
* @return string Javascript Code
**/
function getAjax($onComplete)
{
?>
<script type="text/javascript">
/*<[CDATA[*/
function checkEasyCaptcha (Id) {
http_request = null;
if (window.XMLHttpRequest) {
http_request = new XMLHttpRequest();
} else if (window.ActiveXObject) {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}
if(!http_request) {
alert("<?php echo JTEXT::_('Could not send HTTP-Request'); ?>");
} else {
var url = "<?php echo JURI::base(); ?>index2.php?option=com_easycaptcha&no_html=1&captcha_id=<?php echo $this->captcha_id;?>&captcha_code="+document.getElementById(Id).value;
http_request.open("GET",url, true);
http_request.onreadystatechange = <?php echo $onComplete;?>;
http_request.send(null);
}
return false;
}
/*]]>*/
</script>
<?php
}
/**
* Gets the image url of the captcha-image
* @return string URL of captcha image
*/
function getImageUrl()
{
return $this->image_url;
}
/**
* Includes needed languagefiles
*
*/
function _getLanguage()
{
$lang =& JFactory::getLanguage();
$lang->load( 'com_easycaptcha' );
}
}
?>