http://www.fsf.org/ or write
* to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
*/
/* This plugin generates an image that can be used to fight form Spam flooding.
*/
include ("plugins/despam_imgtxt/configure.php");
Class CmsDam_Despam_Imgtxt
{
var $conf;
function CmsDam_Despam_Imgtxt() { // Constructor
$this->conf = new CmsDam_Despam_Imgtxt_Conf;
// Drop Expired images
$this->Drop_Expired_Images();
return true;
}
private function Randomize_Letters() {
// Return a randomized string of $this->conf->max_string_lenght letters
// from letters in file $this->conf->letters_filename
$filename = $this->conf->letters_filename;
$limit = $this->conf->max_string_lenght;
$FileDes = fopen ($filename, 'r');
$buffer = fread ($FileDes, filesize ($filename));
fclose ($FileDes);
// Shuffle a string limiting the number of chars
return (substr(str_shuffle($buffer), 0, $limit));
}
private function Drop_Expired_Images() {
// Delete Expired images
$expired_time = time() - $this->conf->image_lifetime;
$dir = $this->conf->image_path;
if (is_dir($dir)) {
$dh = opendir($dir);
while (($file = readdir($dh)) !== false) {
$extension = substr($file, strrpos($file, "."));
if ($extension == ".png") {
//echo "filename: $file : filetype: " . filetype($dir . $file) . "\n";
echo "DEBUG: Image File: " . $file . "
\n";
$token = strtok($file, "_");
$token = strtok("_");
$token = strtok($token, ".");
echo "DEUG: Created: $token" . "
\n";
if ($expired_time > $token) { // This image was expired
echo "DEBUG: Image file was expired: $file" . "
\n";
@unlink ($this->conf->image_path . "/" . $file);
}
}
}
closedir($dh);
}
}
function CmsDam_Despam_Imgtxt_CreateImage() {
$h = $this->conf->height;
$w = $this->conf->width;
$str = $this->Randomize_Letters();
// Don't drop this line... it's a very simple way to avoid Denial Of Service attacks
sleep ($this->conf->dos_sleep);
$handle = ImageCreate ($h, $w);
if ($handle === false) return false;
$bg_color = ImageColorAllocate ($handle, $this->conf->bg_red_color, $this->conf->bg_green_color, $this->conf->bg_blue_color);
$txt_color = ImageColorAllocate ($handle, $this->conf->txt_red_color, $this->conf->txt_green_color, $this->conf->txt_blue_color);
ImageString ($handle, 6, 5, 2, $str, $txt_color);
ImagePng ($handle, $this->conf->image_path . "/" . stripslashes($str) . "_" . time() . ".png", 9);
return $str;
}
function CmsDam_Despam_Imgtxt_DeleteImage($str) {
@unlink($this->conf->image_path . "/" . stripslashes($str) . ".png");
return true;
}
/*
function CmsDam_Despam_Imgtxt_GetImage($str) {
@unlink($this->conf->image_path . "/" . stripslashes($str) . ".png");
return true;
}
*/
}
$this->included->despam_imgtxt->api = new CmsDam_Despam_Imgtxt;
?>