/**
* Analyzes trackbacks.
*
* @param \FlameCore\Gatekeeper\Visitor $visitor
* @return bool|string
*/
protected function checkTrackback(Visitor $visitor)
{
$headers = $visitor->getRequestHeaders();
// Web browsers don't send trackbacks
if ($visitor->isBrowser()) {
return 'f0dcb3fd';
}
// Proxy servers don't send trackbacks either
if ($headers->has('Via') || $headers->has('Max-Forwards') || $headers->has('X-Forwarded-For') || $headers->has('Client-Ip')) {
return 'd60b87c7';
}
// Real WordPress trackbacks may contain 'Accept:' and have a charset defined
if (strpos($visitor->getUserAgent()->getUserAgentString(), 'WordPress/') !== false) {
if (strpos($headers->get('Accept'), 'charset=') === false) {
return 'e3990b47';
}
}
return false;
}
