private function normalizeAndFilterClientIps(array $clientIps, $ip)
{
$clientIps[] = $ip; // Complete the IP chain with the IP the request actually came from
$firstTrustedIp = null;
foreach ($clientIps as $key => $clientIp) {
// Remove port (unfortunately, it does happen)
if (preg_match('{((?:\d+\.){3}\d+)\:\d+}', $clientIp, $match)) {
$clientIps[$key] = $clientIp = $match[1];
}
if (!filter_var($clientIp, FILTER_VALIDATE_IP)) {
unset($clientIps[$key]);
continue;
}
if (IpUtils::checkIp($clientIp, self::$trustedProxies)) {
unset($clientIps[$key]);
// Fallback to this when the client IP falls into the range of trusted proxies
if (null === $firstTrustedIp) {
$firstTrustedIp = $clientIp;
}
}
}
// Now the IP chain contains only untrusted proxies and the client IP
return $clientIps ? array_reverse($clientIps) : array($firstTrustedIp);
}