Backend/serverCommunication/web.go

package serverCommunication

import (
	"context"
	"crypto/rand"
	"math/big"
	"time"

	"github.com/gofiber/websocket/v2"
	"go.mongodb.org/mongo-driver/bson"
	"krakatoa.net/backend/modules/cache"
	kraSettingsConfig "krakatoa.net/backend/modules/configs/kraSettingsConfig"
	"krakatoa.net/backend/modules/kraProtocol"
	"krakatoa.net/backend/modules/logger"
	"krakatoa.net/backend/modules/mongo"
	"krakatoa.net/backend/modules/structs"
)

func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, status int, cmdID int, dest int, cmdNumber int, args string) {
	var err error
	var raw []byte
	var client *structs.WebClient

	if status == kraProtocol.StatusGet {
		client = getWebClientByConn(conn)

		if client == nil {
			raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusErrTryAgain, cmdID, cmdNumber, "")

			err = client.SendBinaryMessage(conn, raw)

			if err != nil {
				logger.Web.Warnln("write:", err)
			}
			return
		} else {
			var cmdIDInList bool

			logger.Web.Println("cmdID", isVoice, client.VoiceCmdIDs, client.MobileCmdIDs)

			if isVoice {
				cmdIDInList = isCmdIDInList(client.VoiceCmdIDs, cmdID)
			} else {
				cmdIDInList = isCmdIDInList(client.MobileCmdIDs, cmdID)
			}

			if cmdIDInList { // cmdID already in queue
				raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusMessageAlreadyInQueue, cmdID, cmdNumber, "")

				err = client.SendBinaryMessage(conn, raw)

				if err != nil {
					logger.WebVoice.Warnln("write:", err)
				}
				return
			}

			// add cmdID to list

			if isVoice {
				logger.Web.Debugln("voiceCmdIDs", client.VoiceCmdIDs)
				client.VoiceCmdIDs = append(client.VoiceCmdIDs, cmdID)
				logger.Web.Debugln("after voiceCmdIDs", client.VoiceCmdIDs)
			} else {
				logger.Web.Debugln("MobileCmdIDs", client.MobileCmdIDs)
				client.MobileCmdIDs = append(client.MobileCmdIDs, cmdID)
				logger.Web.Debugln("after MobileCmdIDs", client.MobileCmdIDs)
			}
		}
	}

	if dest == kraProtocol.DestProxy || dest == kraProtocol.DestPlayersCurrentServer { // forwarding message to java / minecraft
		connForDest := getConnForDest(dest, uuid)

		raw = kraProtocol.SendMessageToJava(status, cmdID, dest, uuid, cmdNumber, args)

		err = client.SendBinaryMessage(connForDest, raw)

		if err != nil {
			logger.Web.Warnln("write:", err)
		}
	} else { // web
		if isVoice { // message from voice
			if dest == kraProtocol.DestMobile { // forwarding message to mobile
				connForDest := getConnForDest(dest, uuid) // get conn for mobile

				if connForDest != nil { // mobile is connected
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusReply, cmdID, cmdNumber, args)

					err = client.SendBinaryMessage(connForDest, raw)

					if err != nil {
						logger.WebVoice.Warnln("write:", err)
					}
				} else { // mobile not connected
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusSend, 58299, cmdNumber, "")

					err = client.SendBinaryMessage(conn, raw)

					if err != nil {
						logger.WebVoice.Warnln("write:", err)
					}
				}
			} else if dest == kraProtocol.DestBackend {
				resArgs := voiceCommandHandler(cmdNumber, uuid)

				if status == kraProtocol.StatusGet {
					logger.Web.Debugln("status get reply")
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusReply, cmdID, cmdNumber, resArgs)

					err = client.SendBinaryMessage(conn, raw)

					if err != nil {
						logger.WebVoice.Warnln("write:", err)
					}
				}
			}
		} else { // message from mobile
			if dest == kraProtocol.DestVoice { // forwarding message to voice
				connForDest := getConnForDest(dest, uuid) // get conn for voice

				if connForDest != nil { // voice connected
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusSend, cmdID, cmdNumber, args)

					err = client.SendBinaryMessage(connForDest, raw)

					if err != nil {
						logger.WebMobile.Warnln("write:", err)
					}
				} else { // voice not connected
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusSend, 5456, cmdNumber, "")

					err = client.SendBinaryMessage(conn, raw)

					if err != nil {
						logger.WebMobile.Warnln("write:", err)
					}
				}
			} else if dest == kraProtocol.DestBackend {
				resArgs := mobileCommandHandler(cmdNumber)

				if status == kraProtocol.StatusGet {
					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusReply, cmdID, cmdNumber, resArgs)

					err = client.SendBinaryMessage(conn, raw)

					if err != nil {
						logger.WebVoice.Warnln("write:", err)
					}
				}
			} else { // err dest unknown
				raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusErrTryAgain, cmdID, cmdNumber, "")

				err = client.SendBinaryMessage(conn, raw)

				if err != nil {
					logger.WebMobile.Warnln("write:", err)
				}
			}
		}
	}

	if client != nil { // remove cmdID from list
		if isVoice {
			client.RemoveVoiceCmdID(cmdID)
		} else {
			client.RemoveMobileCmdID(cmdID)
		}

		/*var newArr []int
		if isVoice {
			newArr, err = removeCmdIDFromList(client.VoiceCmdIDs, cmdID)

			if err != nil {
				logger.WebVoice.Warnln("removeCmdIDFromList:", err)
			} else {
				client.VoiceCmdIDs = newArr
			}
		} else {
			newArr, err = removeCmdIDFromList(client.MobileCmdIDs, cmdID)

			if err != nil {
				logger.WebMobile.Warnln("removeCmdIDFromList:", err)
			} else {
				client.MobileCmdIDs = newArr
			}
		} */
	}
}

func voiceCommandHandler(cmdNumber int, uuid string) (args string) {
	switch cmdNumber {
	case 36006: // mobile web code
		logger.WebMobile.Println("case 36006", uuid)

		mobileWebCode, err := generateMobileWebCode()

		if err != nil {
			logger.WebVoice.Warnln("gen mobileWebCode", err)
		}

		filter := bson.D{{"uuid", uuid}}
		update := bson.D{{"$set", bson.D{{"mobileWebCode", mobileWebCode}}}}

		_, err = mongo.PlayersCollection.UpdateOne(context.TODO(), filter, update)

		if err != nil {
			logger.WebVoice.Println("updRes", err)
		}

		return mobileWebCode
	case 28450: // testing message to mobile

		time.Sleep(time.Second * 10)
		return "hello my friend"
	default:
		logger.WebVoice.Println("case default", cmdNumber)

		return "vdefault"
	}
}

func mobileCommandHandler(cmdNumber int) (args string) {
	switch cmdNumber {
	case 15857: // testing message from voice

		return "from voice"
	default:
		logger.WebMobile.Println("case default", cmdNumber)
		return "mdefault"
	}
}

func generateMobileWebCode() (string, error) {
	mobileWebCodeLetters := kraSettingsConfig.Cfg.VoiceWebCode.Letters
	mobileWebCodeLength := kraSettingsConfig.Cfg.VoiceWebCode.Length

	ret := make([]byte, mobileWebCodeLength)
	for i := 0; i < mobileWebCodeLength; i++ {
		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(mobileWebCodeLetters))))
		if err != nil {
			return "", err
		}
		ret[i] = mobileWebCodeLetters[num.Int64()]
	}

	return string(ret), nil
}

/*
func IsMessageInAckQueue(conn *websocket.Conn, cmdID int) bool {
	for _, client := range cache.VoiceCmdIDs {
		if client.CmdID == cmdID && client.Conn == conn {
			return true
		}
	}
	return false
} */

func getWebClientByConn(conn *websocket.Conn) *structs.WebClient {
	for _, client := range cache.WebClients {
		if client.VoiceConn == conn || client.MobileConn == conn {
			return client
		}
	}
	return nil
}

func GetWebClientByUuid(Uuid string) *structs.WebClient {
	logger.Web.Debugln("len clients", len(cache.WebClients))

	// return client from clients list
	for uuid, client := range cache.WebClients {
		if uuid == Uuid {
			logger.Web.Debugln("return client", client.Uuid)
			return client
		}
	}

	// add to clients list
	client := &structs.WebClient{Uuid: Uuid}

	cache.WebClients[Uuid] = client

	logger.Web.Debugln("new client")

	return client
}

func IsVoiceAndMobileSocketConnected(uuid string) string {
	client := GetWebClientByUuid(uuid)

	if client.MobileConn == nil && client.VoiceConn == nil {
		return "0"
	} else {
		return "1"
	}
}

func isCmdIDInList(arr []int, cmdID int) bool {
	for i := 0; i < len(arr); i++ {
		if arr[i] == cmdID {
			return true
		}
	}
	return false
}