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<?php
/**
* @package AcyMailing for Joomla!
* @version 5.2.0
* @author acyba.com
* @copyright (C) 2009-2016 ACYBA S.A.R.L. All rights reserved.
* @license GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
*/
defined('_JEXEC') or die('Restricted access');
?><?php
class acycaptchaClass{
var $letters = 'abcdefghijkmnpqrstwxyz23456798ABCDEFGHJKLMNPRSTUVWXYZ';
var $background_color = '';
var $colors = array();
var $width;
var $height;
var $nb_letters;
var $rotated = true;
var $font = '';
var $image = null;
var $code = '';
var $error = '';
var $_footprint = array();
var $_angle = array();
var $_rest = 0;
var $space = 3;
var $size = 16;
var $state;
function __construct(){
$this->font = ACYMAILING_FRONT.'inc'.DS.'font'.DS.'mgopencosmeticabold.ttf';
}
function available(){
if(!function_exists('gd_info')){
$this->error = 'The GD library is not installed.';
return false;
}
if(!function_exists('imagettftext')){
$this->error = 'The FreeType library is not installed.';
return false;
}
if(!function_exists('imagecreatetruecolor')){
$this->error = 'GD library version is too old. Update to GD2';
return false;
}
if(!file_exists($this->font)){
$this->error = 'Font missing';
return false;
}
return true;
}
function getCaptchaPlugins(){
$results = array();
$captchaPlugins = JPluginHelper::getPlugin('captcha');
foreach($captchaPlugins as $captchaPlugin){
$plugin = new stdClass();
$plugin->text = $plugin->value = $captchaPlugin->name;
$results[] = $plugin;
}
if($this->available()){
$acycaptcha = new stdClass();
$acycaptcha->text = JText::_('CAPTCHA_ACYCAPTCHA');
$acycaptcha->value = 'acycaptcha';
}
$nocaptcha = new stdClass();
$nocaptcha->text = JText::_('CAPTCHA_NOCAPTCHA');
$nocaptcha->value = 'no';
$results = array_merge(array($nocaptcha, $acycaptcha), $results);
return $results;
}
function display($formName = ''){
$config = acymailing_config();
$captchaPluginName = $config->get('captcha_plugin');
if($captchaPluginName == 'acycaptcha'){
$js = '
function refreshCaptchaModule(formName){
var captchaLink = document.getElementById(\'captcha_picture_\'+formName).src;
myregexp = new RegExp(\'val[-=]([0-9]+)\');
valToChange=captchaLink.match(myregexp)[1];
document.getElementById(\'captcha_picture_\'+formName).src = captchaLink.replace(valToChange,valToChange+\'0\');
}
';
$doc = JFactory::getDocument();
$doc->addScriptDeclaration($js);
if(ACYMAILING_J16){
$image = '<img id="captcha_picture_'.$formName.'" title="'.JText::_('ERROR_CAPTCHA').'" width="'.$config->get('captcha_width_module').'" height="'.$config->get('captcha_height_module').'" class="captchaimagemodule" src="'.JRoute::_('index.php?option=com_acymailing&ctrl=captcha&acyformname='.$formName.'&val='.rand(0, 10000)).'" alt="captcha" />';
}else{
$image = '<img id="captcha_picture_'.$formName.'" title="'.JText::_('ERROR_CAPTCHA').'" width="'.$config->get('captcha_width_module').'" height="'.$config->get('captcha_height_module').'" class="captchaimagemodule" src="'.rtrim(JURI::root(), '/').'/index.php?option=com_acymailing&ctrl=captcha&acyformname='.$formName.'&val='.rand(0, 10000).'" alt="captcha" />';
}
$refreshImg = '<span class="refreshCaptchaModule" onclick="refreshCaptchaModule(\''.$formName.'\')"> </span>';
$input = '<input id="user_captcha_'.$formName.'" title="'.JText::_('ERROR_CAPTCHA').'" class="inputbox captchafield" type="text" name="acycaptcha" style="width:50px" />';
echo $image.$refreshImg.$input;
}else{
if(!empty($formName)){
$paramsInit = array($formName.'-captcha');
$paramsDisplay = array(null, $formName.'-captcha', 'class=""');
}else{
$paramsInit = array('acymailing-captcha');
$paramsDisplay = array(null, 'acymailing-captcha', 'class=""');
}
$dispatcher = JDispatcher::getInstance();
JPluginHelper::importPlugin('captcha', $captchaPluginName);
$dispatcher->trigger('onInit', $paramsInit);
$result = $dispatcher->trigger('onDisplay', $paramsDisplay);
if(!empty($result) && !empty($result[0])) echo $result[0];
}
}
function get(){
if(!$this->available()){
echo $this->error;
exit;
}
if(empty($this->code)){
$this->_generateCode();
}
$this->_initImage();
$this->_addCode();
$currentSession = JFactory::getSession();
if(is_null($currentSession->get('registry'))){
jimport('joomla.registry.registry');
$currentSession->set('registry', new JRegistry('session'));
}
$currentSession->set($this->state, $this->code);
ob_start();
imagepng($this->image);
$image = ob_get_clean();
imagedestroy($this->image);
$this->image = $image;
return true;
}
function check($input, $secKey = ''){
$config = acymailing_config();
if($secKey == $config->get('security_key')) return true;
$captchaPluginName = $config->get('captcha_plugin');
if($captchaPluginName == 'acycaptcha'){
$currentSession = JFactory::getSession();
$code = $currentSession->get($this->state);
if(empty($code) || empty($input)) return false;
if(strtolower($code) == strtolower($input)){
return true;
}
return false;
}else{
$dispatcher = JDispatcher::getInstance();
JPluginHelper::importPlugin('captcha', $captchaPluginName);
$result = $dispatcher->trigger('onCheckAnswer', array());
return $result[0];
}
}
function returnError(){
header("Content-type:text/html; charset=utf-8");
echo "<script> alert('".JText::_('ERROR_CAPTCHA', true)."'); window.history.go(-1);</script>\n";
exit;
}
function displayImage(){
@ob_end_clean();
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/png');
echo $this->image;
exit;
}
private function _addCode(){
if($this->rotated){
$this->_generateRotate();
}
$this->_generateFootprint();
$i = 0;
$test = 0;
$old = 'size';
while(!$this->_fit() && $test < 50){
if($old == 'size'){
$old = 'space';
$this->size--;
}else{
$old = 'size';
$this->space--;
}
$this->_generateFootprint();
$test++;
}
$outerspace = round($this->_rest / 2);
$x = ($outerspace < $this->_vals[$i]['x'] / 2 ? $this->_vals[$i]['x'] / 2 : $outerspace);
$y = rand($this->_vals[$i]['y'] + 5, $this->height - $this->_vals[$i]['y'] + 5);
while($i < $this->nb_letters){
list($r, $g, $b) = $this->_color_hex2dec($this->colors[mt_rand(0, count($this->colors) - 1)]);
$clr = imagecolorallocate($this->image, $r, $g, $b);
if($this->rotated){
$angle = $this->_angle[$i];
}else{
$angle = 0;
}
imagettftext($this->image, $this->size, $angle, $x, $y, $clr, $this->font, $this->code[$i]);
$x = $x + $this->_vals[$i]['x'] + $this->space;
$y = rand($this->_vals[$i]['y'] + 5, $this->height - $this->_vals[$i]['y'] + 5);
$i++;
}
}
private function _fit(){
$i = 0;
$px = 0;
while($i < $this->nb_letters){
$maxx = $this->_letter($i, 'max', 'x');
$minx = $this->_letter($i, 'min', 'x');
$maxy = $this->_letter($i, 'max', 'y');
$miny = $this->_letter($i, 'min', 'y');
$val = $maxx - $minx;
if(!isset($this->_vals)){
$this->_vals = array();
}
if(!array_key_exists($i, $this->_vals)){
$this->_vals[$i] = array();
}
$this->_vals[$i]['x'] = $val;
$this->_vals[$i]['y'] = $maxy - $miny;
$px += $val;
$i++;
}
$spaces = ($this->nb_letters + 1) * $this->space;
$rest = $this->width - ($spaces + $px + 13);
if($rest > 0){
$this->_rest = $rest;
return true;
}
return false;
}
private function _letter($i, $type){
$start = 0;
$extreme = $this->_footprint[$i][$start];
$start += 2;
while(array_key_exists($start, $this->_footprint[$i])){
switch($type){
case 'min':
if($this->_footprint[$i][$start] < $extreme){
$extreme = $this->_footprint[$i][$start];
}
break;
case 'max':
if($this->_footprint[$i][$start] > $extreme){
$extreme = $this->_footprint[$i][$start];
}
break;
}
$start += 2;
}
return $extreme;
}
private function _generateCode(){
$this->code = '';
$length = strlen($this->letters) - 1;
$tmp = $this->nb_letters;
while($tmp > 0){
$this->code .= $this->letters[mt_rand(0, $length)];
$tmp--;
}
return true;
}
private function _generateRotate(){
$i = 0;
while($i < $this->nb_letters){
$this->_angle[$i] = 360 + mt_rand(-15, 15);
$i++;
}
}
private function _generateFootprint(){
$i = 0;
while($i < $this->nb_letters){
if($this->rotated){
$angle = $this->_angle[$i];
}else{
$angle = 0;
}
$this->_imagettfbbox_t($angle, $this->code[$i]);
$i++;
}
}
private function _imagettfbbox_t($angle, $text){
$coords = imagettfbbox($this->size, 0, $this->font, $text);
if($coords == null){
echo 'error loading the font at '.$this->font;
exit;
}
$a = deg2rad($angle);
$ca = cos($a);
$sa = sin($a);
$ret = array();
for($i = 0; $i < 7; $i += 2){
$ret[$i] = round($coords[$i] * $ca + $coords[$i + 1] * $sa);
$ret[$i + 1] = round($coords[$i + 1] * $ca - $coords[$i] * $sa);
}
$this->_footprint[] = $ret;
}
private function _initImage(){
$this->image = imagecreatetruecolor(intval($this->width), intval($this->height));
if(empty($this->background_color)){
$ImgWhite = imagecolorallocate($this->image, 255, 255, 255);
imagefill($this->image, 0, 0, $ImgWhite);
imagecolortransparent($this->image, $ImgWhite);
}else{
list($r, $g, $b) = $this->_color_hex2dec($this->background_color);
$clr = imagecolorallocate($this->image, $r, $g, $b);
imagefill($this->image, 0, 0, $clr);
}
}
private function _color_hex2dec($color){
if($color[0] == '#'){
$color = substr($color, 1);
}
return array(hexdec(substr($color, 0, 2)), hexdec(substr($color, 2, 2)), hexdec(substr($color, 4, 2)));
}
}