Your IP : 216.73.216.105
<?php
/********************************************************************
Product : Flexicontact
Date : 31 December 2015
Copyright : Les Arbres Design 2010-2015
Contact : http://www.lesarbresdesign.info
Licence : GNU General Public License
*********************************************************************/
defined('_JEXEC') or die('Restricted Access');
class Flexi_captcha
{
// -------------------------------------------------------------------------------
// Display the image captcha
// Builds a structure containing information about the test and stores it in the session
// Returns the description of the target image
//
static function show_image_captcha($config_data, $error)
{
$html = '';
// get list of images in images directory
$handle = opendir(LAFC_SITE_IMAGES_PATH);
if (!$handle)
{
$html .= "Images directory not found";
return;
}
$image_list = array();
while (($filename = readdir($handle)) != false)
{
if ($filename == '.' or $filename == '..')
continue;
$imageInfo = @getimagesize(LAFC_SITE_IMAGES_PATH.'/'.$filename);
if ($imageInfo === false)
continue; // not an image
if ($imageInfo[3] > 3) // only support gif, jpg or png
continue;
if ($imageInfo[0] > 150) // if X size > 150 pixels ..
continue; // .. it's too big so skip it
$image = array();
$image['filename'] = $filename;
$image['width'] = $imageInfo[0];
$image['height'] = $imageInfo[1];
$image['type'] = $imageInfo[2];
$image_list[] = $image;
}
closedir($handle);
if (empty($image_list))
{
$html .= "No suitable images in images directory";
return;
}
$imageCount = count($image_list);
if ($imageCount < $config_data->num_images)
{
$html .= 'Not enough images in images directory. Requested: '.$config_data->num_images.' Found: '.$imageCount.'<br />';
return;
}
// load the Javascript
$js= "function imageSelect(pictureID) {var images = document.getElementsByTagName('img');
for (var i = 0; i < images.length; i++) if (images[i].className == 'fc_active') images[i].className = 'fc_inactive';
document.getElementById(pictureID).className = 'fc_active'; document.fc_form.picselected.value = pictureID; }\n";
$doc = JFactory::getDocument();
$doc->addScriptDeclaration($js);
// choose the images
$i = 0;
$randoms = array();
while ($i < $config_data->num_images)
{
$imageNum = rand(0,$imageCount - 1); // get a random number
if (in_array($imageNum,$randoms)) // if already chosen
continue; // try again
$randoms[] = $imageNum; // add to random number array
$i ++; // got one more
}
// build the captcha information structure
$captcha_info = new stdClass();
$captcha_info->num_images = $config_data->num_images;
$captcha_info->images = array();
for ($i = 0; $i < $config_data->num_images; $i++)
{
$j = $randoms[$i]; // index of the next chosen image
$image = $image_list[$j]; // point to image info
$captcha_info->images[$i] = $image; // copy the image info array into the captcha_info structure
}
// choose the target image and store it in the captcha_info structure
$captcha_info->target = rand(0, $config_data->num_images - 1);
$target_filename = $captcha_info->images[$captcha_info->target]['filename'];
// store the captcha_info structure in the session
$app = JFactory::getApplication();
$app->setUserState(LAFC_COMPONENT."_captcha_info", $captcha_info);
// load the additional language file provided by our image packs
$lang = JFactory::getLanguage();
$lang->load('com_flexicontact_captcha', JPATH_SITE);
$html .= "\n".'<div class="fc_images">';
$html .= "\n".'<div class="fc_image_text">';
// do we have an error message?
if ($error != '')
$html .= "\n".'<span class="fc_error_msg">'.$error.'</span> ';
// get the description of the target image and make the user prompt
$target_text = JText::_('COM_FLEXICONTACT_IMAGE_'.strtoupper($target_filename));
$select_image_text = JText::_('COM_FLEXICONTACT_SELECT_IMAGE');
if (strstr($select_image_text,"%s"))
$html .= '<span class="fc_image_desc">'.JText::sprintf('COM_FLEXICONTACT_SELECT_IMAGE',$target_text).'</span>';
else
$html .= '<span class="fc_image_desc">'.$select_image_text.' '.$target_text.'</span>';
$html .= "\n".'</div>';
// draw the chosen images
$html .= '<div class="fc_image_inner">';
foreach ($captcha_info->images as $index => $image)
{
$img_id = sprintf('fc_image_%03d', $index);
$img_name = $image['filename'];
$image_height = $image['height'];
$image_width = $image['width'];
if ($config_data->raw_images)
$src = JURI::root(true).'/components/com_flexicontact/images/'.$img_name;
else
$src = JURI::base().'index.php/en/?option='.LAFC_COMPONENT.'&tmpl=component&format=raw&task=image&n='.$index.'&r='.rand();
$imageHtml = '<img id="i_'.$img_id.'" src="'.$src.'" width="'.$image_width.'" height="'.$image_height.'"
alt="" class="fc_inactive" onclick="imageSelect('."'i_".$img_id."'".')" />';
$html .= "\n".$imageHtml;
}
$html .= "\n".'</div>';
$html .= "\n".'<input type="hidden" name="picselected" value="" />';
$html .= "\n".'</div>';
return $html;
}
// -------------------------------------------------------------------------------
// Serve an image to the browser
//
static function show_image()
{
$app = JFactory::getApplication();
$captcha_info = $app->getUserState(LAFC_COMPONENT."_captcha_info",'');
if ($captcha_info == NULL)
return; // the user has no session or it has timed out
$jinput = JFactory::getApplication()->input;
$image_number = $jinput->get('n', 0, 'INT');
$filename = $captcha_info->images[$image_number]['filename'];
$filepath = LAFC_SITE_IMAGES_PATH.'/'.$filename;
// set the mime type
switch ($captcha_info->images[$image_number]['type'])
{
case 1:
$mimetype = 'image/gif';
break;
case 2:
$mimetype = 'image/jpeg';
break;
case 3:
$mimetype = 'image/png';
break;
default: return;
}
while (@ob_end_clean());
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: $mimetype");
echo readfile($filepath);
echo self::random_data();
exit;
}
// -------------------------------------------------------------------------------
// Make some random data to vary the image file length
//
static function random_data()
{
$str = '';
$length = rand(0,200);
for ($i = 0; $i < $length; $i++)
$str .= chr(rand(0,255));
return $str;
}
// -------------------------------------------------------------------------------
// Check if the user picked the correct image
// returns 0 for yes, the user picked the correct image
// 1 for no, the user picked the wrong image
// 2 if the user picked the wrong image more than 5 times
//
static function check($pic_selected)
{
$app = JFactory::getApplication();
$captcha_info = $app->getUserState(LAFC_COMPONENT."_captcha_info",'');
if ($captcha_info == '')
return 1;
$target_img_id = sprintf('fc_image_%03d', $captcha_info->target);
if (($pic_selected == '') or (strcmp($target_img_id,$pic_selected) != 0))
{
$retry_count = $app->getUserState(LAFC_COMPONENT."_captcha_retry_count",0);
$retry_count ++;
$app->setUserState(LAFC_COMPONENT."_captcha_retry_count", $retry_count);
if ($retry_count <= 5)
return 1;
else
return 2;
}
$app->setUserState(LAFC_COMPONENT."_captcha_info", ''); // destroy the session captcha info
return 0;
}
}
?>