// ----------------------------------------------------------------------------
func main() {
commands, appConfig, err := getConfig()
if err != nil {
log.Fatal(err)
}
bot, err := tgbotapi.NewBotAPI(appConfig.token)
if err != nil {
log.Fatal(err)
}
log.Printf("Authorized on bot account: @%s", bot.Self.UserName)
tgbotConfig := tgbotapi.NewUpdate(0)
tgbotConfig.Timeout = appConfig.botTimeout
botUpdatesChan, err := bot.GetUpdatesChan(tgbotConfig)
if err != nil {
log.Fatal(err)
}
users := NewUsers(appConfig)
messageSignal := make(chan BotMessage, MessagesQueueSize)
vacuumTicker := time.Tick(SecondsForOldUsersBeforeVacuum * time.Second)
saveToBDTicker := make(<-chan time.Time)
exitSignal := make(chan struct{})
systemExitSignal := make(chan os.Signal)
signal.Notify(systemExitSignal, os.Interrupt, os.Kill)
if appConfig.persistentUsers {
saveToBDTicker = time.Tick(SecondsForAutoSaveUsersToDB * time.Second)
}
var cacheTTL *cache.MemoryTTL
if appConfig.cache > 0 {
cacheTTL = cache.NewMemoryWithTTL(time.Duration(appConfig.cache) * time.Second)
cacheTTL.StartGC(time.Duration(appConfig.cache) * time.Second * 2)
}
// all /shell2telegram sub-commands handlers
internalCommands := map[string]func(Ctx) string{
"stat": cmdShell2telegramStat,
"ban": cmdShell2telegramBan,
"search": cmdShell2telegramSearch,
"desc": cmdShell2telegramDesc,
"rm": cmdShell2telegramRm,
"exit": cmdShell2telegramExit,
"version": cmdShell2telegramVersion,
"broadcast_to_root": cmdShell2telegramBroadcastToRoot,
"message_to_user": cmdShell2telegramMessageToUser,
}
doExit := false
for !doExit {
select {
case telegramUpdate := <-botUpdatesChan:
var messageCmd, messageArgs string
allUserMessage := telegramUpdate.Message.Text
if len(allUserMessage) > 0 && allUserMessage[0] == '/' {
messageCmd, messageArgs = splitStringHalfBySpace(allUserMessage)
} else {
messageCmd, messageArgs = "/:plain_text", allUserMessage
}
allowPlainText := false
if _, ok := commands["/:plain_text"]; ok {
allowPlainText = true
}
replayMsg := ""
if len(messageCmd) > 0 && (messageCmd != "/:plain_text" || allowPlainText) {
users.AddNew(telegramUpdate.Message)
userID := telegramUpdate.Message.From.ID
allowExec := appConfig.allowAll || users.IsAuthorized(userID)
ctx := Ctx{
appConfig: &appConfig,
users: &users,
commands: commands,
userID: userID,
allowExec: allowExec,
messageCmd: messageCmd,
messageArgs: messageArgs,
messageSignal: messageSignal,
chatID: telegramUpdate.Message.Chat.ID,
exitSignal: exitSignal,
cacheTTL: cacheTTL,
}
switch {
// commands .................................
case !appConfig.isPublicBot && (messageCmd == "/auth" || messageCmd == "/authroot"):
replayMsg = cmdAuth(ctx)
case messageCmd == "/help":
replayMsg = cmdHelp(ctx)
case messageCmd == "/shell2telegram" && users.IsRoot(userID):
messageSubCmd := ""
messageSubCmd, messageArgs = splitStringHalfBySpace(messageArgs)
ctx.messageArgs = messageArgs
if cmdHandler, ok := internalCommands[messageSubCmd]; ok {
replayMsg = cmdHandler(ctx)
} else {
replayMsg = "Sub-command not found"
}
case allowExec && (allowPlainText && messageCmd == "/:plain_text" || messageCmd[0] == '/'):
cmdUser(ctx)
} // switch for commands
if appConfig.logCommands {
log.Printf("%s: %s", users.String(userID), allUserMessage)
}
sendMessage(messageSignal, telegramUpdate.Message.Chat.ID, []byte(replayMsg), false)
}
case botMessage := <-messageSignal:
switch {
case botMessage.messageType == msgIsText && !stringIsEmpty(botMessage.message):
messageConfig := tgbotapi.NewMessage(botMessage.chatID, botMessage.message)
if botMessage.isMarkdown {
messageConfig.ParseMode = tgbotapi.ModeMarkdown
}
_, err = bot.Send(messageConfig)
case botMessage.messageType == msgIsPhoto && len(botMessage.photo) > 0:
bytesPhoto := tgbotapi.FileBytes{Name: botMessage.fileName, Bytes: botMessage.photo}
_, err = bot.Send(tgbotapi.NewPhotoUpload(botMessage.chatID, bytesPhoto))
}
if err != nil {
log.Print("Bot send message error: ", err)
}
case <-saveToBDTicker:
users.SaveToDB(appConfig.usersDB)
case <-vacuumTicker:
users.ClearOldUsers()
case <-systemExitSignal:
go func() {
exitSignal <- struct{}{}
}()
case <-exitSignal:
if appConfig.persistentUsers {
users.needSaveDB = true
users.SaveToDB(appConfig.usersDB)
}
doExit = true
}
}
}
// exec shell commands with text to STDIN
func execShell(shellCmd, input string, varsNames []string, userID, chatID int, userName, userDisplayName string, cacheTTL *cache.MemoryTTL) (result []byte) {
cacheKey := shellCmd + "/" + input
if cacheTTL != nil {
cacheData, err := cacheTTL.Get(cacheKey)
if err != cache.ErrNotFound && err != nil {
log.Print(err)
} else if err == nil {
// cache hit
return cacheData.([]byte)
}
}
shell, params := "sh", []string{"-c", shellCmd}
if runtime.GOOS == "windows" {
shell, params = "cmd", []string{"/C", shellCmd}
}
osExecCommand := exec.Command(shell, params...)
osExecCommand.Stderr = os.Stderr
// copy variables from parent process
for _, envRaw := range os.Environ() {
osExecCommand.Env = append(osExecCommand.Env, envRaw)
}
if input != "" {
if len(varsNames) > 0 {
// set user input to shell vars
arguments := regexp.MustCompile(`\s+`).Split(input, len(varsNames))
for i, arg := range arguments {
osExecCommand.Env = append(osExecCommand.Env, fmt.Sprintf("%s=%s", varsNames[i], arg))
}
} else {
// write user input to STDIN
stdin, err := osExecCommand.StdinPipe()
if err == nil {
io.WriteString(stdin, input)
stdin.Close()
} else {
log.Print("get STDIN error: ", err)
}
}
}
// set S2T_* env vars
s2tVariables := [...]struct{ name, value string }{
{"S2T_LOGIN", userName},
{"S2T_USERID", strconv.Itoa(userID)},
{"S2T_USERNAME", userDisplayName},
{"S2T_CHATID", strconv.Itoa(userID)},
}
for _, row := range s2tVariables {
osExecCommand.Env = append(osExecCommand.Env, fmt.Sprintf("%s=%s", row.name, row.value))
}
shellOut, err := osExecCommand.Output()
if err != nil {
log.Print("exec error: ", err)
result = []byte(fmt.Sprintf("exec error: %s", err))
} else {
result = shellOut
}
if cacheTTL != nil {
err := cacheTTL.Set(cacheKey, result)
if err != nil {
log.Print(err)
}
}
return result
}