join_cookie.h

#pragma once
 
#include <cstddef>
#include <cstdint>
 
#include "platform/net/net_address.h"
 
namespace Vkm::Engine {

uint64_t sipHash24(uint64_t k0, uint64_t k1, const uint8_t* data, size_t size);

class NetJoinCookie {
    public:
        static constexpr double WINDOW_SECONDS = 10.0;
 
    public:
        NetJoinCookie() = default;
        ~NetJoinCookie() = default;
 
        NetJoinCookie(const NetJoinCookie& other) = default;
        NetJoinCookie& operator=(const NetJoinCookie& other) = default;
 
        NetJoinCookie(NetJoinCookie && other) = default;
        NetJoinCookie& operator=(NetJoinCookie && other) = default;
 
    public:
        void rekey();

        uint64_t issue(const NetAddress& to, double now) const;

        bool accepts(const NetAddress& from, uint64_t token, double now) const;
 
    private:
        uint64_t forWindow(const NetAddress& address, uint64_t window) const;
 
    private:
        uint64_t m_k0 = 0;
        uint64_t m_k1 = 0;
};
 
} // namespace Vkm::Engine