meowlib/client/server.go

package client

import (
	"fmt"
	"time"

	"forge.redroom.link/yves/meowlib"
	"github.com/google/uuid"
	"google.golang.org/protobuf/proto"
)

type InternalServer struct {
	ServerData meowlib.Server  `json:"server_data,omitempty"`
	Presence   bool            `json:"presence,omitempty"`
	LastCheck  time.Time       `json:"last_check,omitempty"`
	Uptime     time.Duration   `json:"uptime,omitempty"`
	Login      string          `json:"login,omitempty"`
	Password   string          `json:"password,omitempty"`
	Me         meowlib.KeyPair `json:"me,omitempty"`
}

type InternalServerList struct {
	Name    string
	Servers []InternalServer
}

func InternalServerFromUrl(url string) *InternalServer {
	var is InternalServer
	is.ServerData.Url = url
	return &is
}

func InternalServerFromServer(server *meowlib.Server) *InternalServer {
	var is InternalServer
	is.ServerData = *server
	is.Me = meowlib.NewKeyPair()
	return &is
}

func (sl *InternalServerList) AddUrls(urls []string) {
	for _, url := range urls {
		sl.Servers = append(sl.Servers, *InternalServerFromUrl(url))
	}
}

// AsymEncryptMessage prepares a message to send to a specific internal server
func (ints *InternalServer) AsymEncryptMessage(Message []byte) (*meowlib.EncryptedMessage, error) {
	var enc *meowlib.EncryptedMessage
	enc, err := meowlib.AsymEncryptAndSign(ints.ServerData.PublicKey, ints.Me.Private, Message)
	if err != nil {
		fmt.Println(err.Error())
		return nil, err
	}
	return enc, err
}

// AsymDecryptMessage reads a message from a specific internal server
func (ints *InternalServer) AsymDecryptMessage(Message []byte, Signature []byte) (DecryptedMessage []byte, err error) {
	DecryptedMessage, err = meowlib.AsymDecryptAndCheck(ints.Me.Private, ints.ServerData.PublicKey, Message, Signature)
	if err != nil {
		fmt.Println(err.Error())
		return nil, err
	}
	return DecryptedMessage, err
}

// Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
func (ints *InternalServer) BuildToServerMessageFromUserMessage(usermsg *meowlib.PackedUserMessage) *meowlib.ToServerMessage {
	var msg meowlib.ToServerMessage
	msg.Uuid = uuid.New().String()
	msg.Type = "1"
	msg.From = ints.Me.Public
	msg.Messages = append(msg.Messages, usermsg)
	return &msg
}

// Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
func (ints *InternalServer) BuildMessageSendingMessage(usermsg *meowlib.PackedUserMessage) ([]byte, error) {
	msg := ints.BuildToServerMessageFromUserMessage(usermsg)
	out, err := proto.Marshal(msg)
	if err != nil {
		return nil, err
	}
	return out, nil
}

// Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
func (ints *InternalServer) BuildMessageRequestMessage(lookupKeys []string) ([]byte, error) {
	var msg meowlib.ToServerMessage
	msg.Uuid = uuid.New().String()
	msg.Type = "1"
	msg.From = ints.Me.Public

	out, err := proto.Marshal(&msg)
	if err != nil {
		return nil, err
	}
	return out, nil
}

func (ints *InternalServer) PackServerMessage(payload []byte, signature []byte) (protoPackedMessage []byte, err error) {
	var msg meowlib.PackedServerMessage
	msg.From = ints.Me.Public
	msg.Payload = payload
	msg.Signature = signature
	out, err := proto.Marshal(&msg)
	if err != nil {
		return nil, err
	}
	return out, nil
}

func (ints *InternalServer) UnPackServerMessage(protoPackedMessage []byte) (payload []byte, signature []byte, err error) {
	msg := &meowlib.PackedServerMessage{}
	if err := proto.Unmarshal(protoPackedMessage, msg); err != nil {
		return nil, nil, err
	}
	return msg.Payload, msg.Signature, nil
}

func (srv *InternalServer) ProcessOutboundMessage(toServerMessage *meowlib.ToServerMessage) ([]byte, error) {
	byteToServerMessage, err := proto.Marshal(toServerMessage)
	if err != nil {
		return nil, err
	}
	// Encrypting it
	encToServer, err := srv.AsymEncryptMessage(byteToServerMessage)
	if err != nil {
		return nil, err
	}
	// Packing it
	protoPackedServerMsg, err := srv.PackServerMessage(encToServer.Data, encToServer.Signature)
	if err != nil {
		return nil, err
	}
	return protoPackedServerMsg, nil
}

func (srv *InternalServer) ProcessInboundServerResponse(msg []byte) (*meowlib.FromServerMessage, error) {
	fsmsg := &meowlib.FromServerMessage{}
	payload, signature, err := srv.UnPackServerMessage(msg)
	if err != nil {
		return nil, err
	}
	decrypted, err := srv.AsymDecryptMessage(payload, signature)
	if err != nil {
		return nil, err
	}
	if err := proto.Unmarshal(decrypted, fsmsg); err != nil {
		return nil, err
	}
	return fsmsg, nil
}