/**
* The main page handler, outputs a 1x1 pixel image.
*/
public function get()
{
if ($t = Request::get('t', 'encrypted')) {
// Track an encrypted link.
if (!Tracker::trackLink($t)) {
Logger::error('Failed to track encrypted link: ' . Encryption::aesDecrypt($t, Configuration::get('tracker.key')));
}
} elseif (Configuration::get('tracker.allow_unencrypted') && ($tracker = Request::get('tracker', 'int'))) {
// Track an unencrypted link.
$user = Request::get('user', 'int') ?: ClientUser::createInstance()->id;
$sub = Request::get('sub', 'int');
Tracker::trackEventID($tracker, $sub, $user);
}
// Output a single pixel image.
header('Content-Type: image/png');
echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=');
exit;
}
