add server side speed check

src/server/ServerWorld.cpp

@@ -3,6 +3,7 @@
 #include <blitz/godot/NetworkInterface.h>
 #include <client/Player.h>
 #include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
 
 namespace blitz {
 
@@ -41,6 +42,16 @@ void ServerWorld::HandlePacket(const protocol::packets::PlayerPositionAndRotatio
 	if (data.m_Player != a_PlayerPos.m_Sender)
 		return;
 
+	Player* player = GetPlayerById(data.m_Player);
+	if (!player)
+		return;
+
+	if ((data.m_Position - player->get_position()).length() > 10) {
+		UtilityFunctions::print(
+			"Player ", data.m_Player, " moved too fast ! (from ", player->get_position(), " to ", data.m_Position, ")");
+		return;
+	}
+
 	SetPlayerPositionAndRotation(data.m_Player, data.m_Position, data.m_Rotation, data.m_Velocity);
 }