Teaspeak-Server/license/shared/License.h

#pragma once

#include <string>
#include <chrono>
#include <memory>
#include <utility>
#include <ThreadPool/Mutex.h>
#include <ThreadPool/Future.h>
#include <Variable.h>

#define LICENSE_VERSION 1
#define LICENSE_PROT_VERSION 2
#define MAGIC_NUMER 0xBADC0DED

namespace license {
    namespace exceptions {
        class LicenseException : public std::exception {
            public:
                LicenseException() = delete;
                LicenseException(std::string message) : errorMessage(std::move(message)) {}
                LicenseException(const LicenseException& ref) : errorMessage(ref.errorMessage) {}
                LicenseException(LicenseException&& ref) : errorMessage(std::move(ref.errorMessage)) {}

                const char* what() const noexcept override;
            private:
                std::string errorMessage;
        };
    }

    struct LicenseHeader {
        uint16_t version;
        const char cryptKey[64]; //The dummy key for data de/encryption
    } __attribute__ ((__packed__));

    /*
    namespace v2 {
    	namespace data {
    		struct ChainHead {
				uint32_t chain_version;
				uint32_t chain_magic;
				uint8_t sign[32];
    		} __attribute__ ((__packed__));

    		struct ChainEntryHead {
                uint8_t entry_type; //sign bit = contains private
				int64_t entry_begin;
				int32_t entry_length;
                uint8_t key[32];
    		} __attribute__ ((__packed__));
    	}

    	struct LicenseIssuer {
    	    std::string name;
    	    std::string email;
    	};

    	struct LicenseChainEntry {
    	    data::ChainEntryHead head;
            struct {
                bool contains;
                uint8_t key[32];
            } prv_key;
            LicenseIssuer issuer;
    	};

        struct LicenseChain {
            public:
                data::ChainHead head;
                std::deque<LicenseChainEntry> entries;

            private:
        };
    }
    */

    enum LicenseType : uint8_t {
        INVALID,
        DEMO,
        PREMIUM,
        HOSTER,
        PRIVATE,
    };

    inline bool isPremiumLicense(LicenseType type){ return type == HOSTER || type == PREMIUM || type == PRIVATE; }

    #define LT_NAMES {"Invalid", "Demo", "Premium", "Hoster", "Private"};
    extern std::string LicenseTypeNames[5];

    struct License {
        LicenseHeader header;

        //Crypted part
        struct {
            LicenseType type;
            int64_t endTimestamp;

            const char licenceKey[64]; //The actual key
            const char licenceOwner[64];

        } __attribute__ ((__packed__)) data;

	    inline std::string key() { return std::string(data.licenceKey, 64); }
	    inline std::chrono::time_point<std::chrono::system_clock> end() { return std::chrono::system_clock::time_point() + std::chrono::milliseconds(this->data.endTimestamp); }
	    inline std::string owner() { return std::string(this->data.licenceOwner); }
        inline bool isValid() { return data.endTimestamp == 0 || std::chrono::system_clock::now() < this->end(); }
        inline bool isPremium(){ return isPremiumLicense(data.type); }
    } __attribute__ ((__packed__));

    struct LicenseInfo {
        LicenseType type;
	    std::string username;
	    std::string first_name;
        std::string last_name;
        std::string email;
        std::chrono::system_clock::time_point start;
	    std::chrono::system_clock::time_point end;
	    std::chrono::system_clock::time_point creation;

	    bool deleted = false;

        inline bool isValid() { return (end.time_since_epoch().count() == 0 || std::chrono::system_clock::now() < this->end); }
    };

    extern std::shared_ptr<License> readLocalLicence(const std::string &, std::string &);
    extern std::string exportLocalLicense(const std::shared_ptr<License>&);
    extern std::string createLocalLicence(LicenseType type, std::chrono::time_point<std::chrono::system_clock> until, std::string licenseOwner);

	namespace protocol {
		enum RequestState {
			UNCONNECTED,
			CONNECTING,
			
			HANDSCAKE,
			SERVER_VALIDATION,
			LICENSE_INFO,
			PROPERTY_ADJUSTMENT,
			MANAGER_AUTHORIZATION,
			MANAGER_CONNECTED,

			DISCONNECTING
		};

		enum PacketType : uint8_t {
			PACKET_CLIENT_HANDSHAKE,
			PACKET_SERVER_HANDSHAKE,
			PACKET_CLIENT_SERVER_VALIDATION,
			PACKET_SERVER_VALIDATION_RESPONSE,
			PACKET_CLIENT_PROPERTY_ADJUSTMENT,
			PACKET_SERVER_PROPERTY_ADJUSTMENT,

			PACKET_CLIENT_AUTH_REQUEST,
			PACKET_SERVER_AUTH_RESPONSE,
			PACKET_CLIENT_LICENSE_CREATE_REQUEST,
			PACKET_SERVER_LICENSE_CREATE_RESPONSE,

            PACKET_CLIENT_LIST_REQUEST,
            PACKET_SERVER_LIST_RESPONSE,

			PACKET_CLIENT_DELETE_REQUEST,
			PACKET_CLIENT_DELETE_RESPONSE,

			PACKET_PING = 0xF0,
			PACKET_DISCONNECT = 0xFF
		};

		struct packet {
			struct {
				PacketType packetId;
				mutable uint16_t length;
			} header;
			std::string data;

			inline void prepare() const {
				this->header.length = (uint16_t) data.length();
			}

			packet(PacketType packetId, std::string data) : data(std::move(data)), header({packetId, 0}) {}

#ifdef GOOGLE_PROTOBUF_MESSAGE_H__
			packet(PacketType packetId, const ::google::protobuf::Message&);
#endif
			packet(PacketType packetId, nullptr_t);
		};
	}
}
//DEFINE_TRANSFORMS(license::LicenseType, uint8_t);