added static function

src/protocol/OpenConnectionReply1.php

@@ -23,10 +23,10 @@ class OpenConnectionReply1 extends OfflineMessage{
 
 	public int $serverID;
 	public bool $serverSecurity;
-	public int|null $cookie;
+	public ?int $cookie;
 	public int $mtuSize;
 
-	public static function create(int $serverId, bool $serverSecurity, int $cookie = null, int $mtuSize) : self{
+	public static function create(int $serverId, bool $serverSecurity, ?int $cookie = null, int $mtuSize) : self{
 		$result = new self;
 		$result->serverID = $serverId;
 		$result->serverSecurity = $serverSecurity;

src/protocol/OpenConnectionRequest2.php

@@ -30,7 +30,7 @@ class OpenConnectionRequest2 extends OfflineMessage{
 
 	protected function encodePayload(PacketSerializer $out) : void{
 		$this->writeMagic($out);
-		if (Cookie::$serverHasSecurity) {
+		if (Cookie::hasServerSecurity()) {
 			$out->putInt($this->cookie);
 			$out->putBool($this->clientSupportsSecurity);
 		}
@@ -41,7 +41,7 @@ protected function encodePayload(PacketSerializer $out) : void{
 
 	protected function decodePayload(PacketSerializer $in) : void{
 		$this->readMagic($in);
-		if (Cookie::$serverHasSecurity) {
+		if (Cookie::hasServerSecurity()) {
 			$this->cookie = $in->getInt();
 			$this->clientSupportsSecurity = $in->getBool();
 		}

src/server/UnconnectedMessageHandler.php

@@ -83,12 +83,12 @@ private function handle(OfflineMessage $packet, InternetAddress $address) : bool
 				$this->server->getLogger()->notice("Refused connection from $address due to incompatible RakNet protocol version (version $packet->protocol)");
 			}else{
 				$cookie = null;
-				if (Cookie::$serverHasSecurity) {
+				if (Cookie::hasServerSecurity()) {
 					Cookie::add($address);
 					$cookie = Cookie::get($address);
 				}
 				//IP header size (20 bytes) + UDP header size (8 bytes)
-				$this->server->sendPacket(OpenConnectionReply1::create($this->server->getID(), Cookie::$serverHasSecurity, $cookie, $packet->mtuSize + 28), $address);
+				$this->server->sendPacket(OpenConnectionReply1::create($this->server->getID(), Cookie::hasServerSecurity(), $cookie, $packet->mtuSize + 28), $address);
 			}
 		}elseif($packet instanceof OpenConnectionRequest2){
 			// The client may not send such data even though serverSecurity is enabled, and if we try to decode this, we may encounter an error
@@ -104,7 +104,7 @@ private function handle(OfflineMessage $packet, InternetAddress $address) : bool
 					$this->server->getLogger()->debug("Not creating session for $address due to session already opened");
 					return true;
 				}
-				if (Cookie::$serverHasSecurity) {
+				if (Cookie::hasServerSecurity()) {
 					if (!Cookie::check($address, $packet->cookie)) {
 						// Disconnect if OpenConnectionReply1 and the cookie in the OpenCnnectionRequest2 packet do not match
 						$this->server->getLogger()->debug("Not creating session for $address due to session mismatched cookies");

src/utils/Cookie.php

@@ -37,6 +37,10 @@ public static function get(InternetAddress $address) : int{
         return 0;
     }
 
+    public static function hasServerSecurity () : bool {
+        return self::$serverHasSecurity;
+    }
+
     public static function check(InternetAddress $address, int $cookie) : bool{
         $addressStr = $address->toString();