package main import ( "fmt" "math/rand" "strings" "time" tg "github.com/go-telegram-bot-api/telegram-bot-api" ) type TelegramVerifiedToken struct { Token string ChatID int64 Username string } type TelegramDaemon struct { Stopped bool ShutdownChannel chan string bot *tg.BotAPI username string tokens []string verifiedTokens []TelegramVerifiedToken languages map[int64]string // Store of languages for chatIDs. Added to on first interaction, and loaded from app.storage.telegram on start. link string app *appContext } func newTelegramDaemon(app *appContext) (*TelegramDaemon, error) { token := app.config.Section("telegram").Key("token").String() if token == "" { return nil, fmt.Errorf("token was blank") } bot, err := tg.NewBotAPI(token) if err != nil { return nil, err } td := &TelegramDaemon{ ShutdownChannel: make(chan string), bot: bot, username: bot.Self.UserName, tokens: []string{}, verifiedTokens: []TelegramVerifiedToken{}, languages: map[int64]string{}, link: "https://t.me/" + bot.Self.UserName, app: app, } for _, user := range app.storage.telegram { if user.Lang != "" { td.languages[user.ChatID] = user.Lang } } return td, nil } func genAuthToken() string { rand.Seed(time.Now().UnixNano()) pin := make([]rune, 8) for i := range pin { if i == 2 || i == 5 { pin[i] = '-' } else { pin[i] = runes[rand.Intn(len(runes))] } } return string(pin) } var runes = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") // NewAuthToken generates an 8-character pin in the form "A1-2B-CD". func (t *TelegramDaemon) NewAuthToken() string { pin := genAuthToken() t.tokens = append(t.tokens, pin) return pin } func (t *TelegramDaemon) run() { t.app.info.Println("Starting Telegram bot daemon") u := tg.NewUpdate(0) u.Timeout = 60 updates, err := t.bot.GetUpdatesChan(u) if err != nil { t.app.err.Printf("Failed to start Telegram daemon: %v", err) return } for { var upd tg.Update select { case upd = <-updates: if upd.Message == nil { continue } sects := strings.Split(upd.Message.Text, " ") if len(sects) == 0 { continue } lang := t.app.storage.lang.chosenTelegramLang storedLang, ok := t.languages[upd.Message.Chat.ID] if !ok { found := false for code := range t.app.storage.lang.Telegram { if code[:2] == upd.Message.From.LanguageCode { lang = code found = true break } } if found { t.languages[upd.Message.Chat.ID] = lang } } else { lang = storedLang } switch msg := sects[0]; msg { case "/start": t.commandStart(&upd, sects, lang) continue case "/lang": t.commandLang(&upd, sects, lang) continue default: t.commandPIN(&upd, sects, lang) } case <-t.ShutdownChannel: t.bot.StopReceivingUpdates() t.ShutdownChannel <- "Down" return } } } func (t *TelegramDaemon) Reply(upd *tg.Update, content string) error { msg := tg.NewMessage((*upd).Message.Chat.ID, content) _, err := t.bot.Send(msg) return err } func (t *TelegramDaemon) QuoteReply(upd *tg.Update, content string) error { msg := tg.NewMessage((*upd).Message.Chat.ID, content) msg.ReplyToMessageID = (*upd).Message.MessageID _, err := t.bot.Send(msg) return err } // Send will send a telegram message to a list of chat IDs. message.text is used if no markdown is given. func (t *TelegramDaemon) Send(message *Message, ID ...int64) error { for _, id := range ID { var msg tg.MessageConfig if message.Markdown == "" { msg = tg.NewMessage(id, message.Text) } else { msg = tg.NewMessage(id, strings.ReplaceAll(message.Markdown, ".", "\\.")) msg.ParseMode = "MarkdownV2" } _, err := t.bot.Send(msg) if err != nil { return err } } return nil } func (t *TelegramDaemon) Shutdown() { t.Stopped = true t.ShutdownChannel <- "Down" <-t.ShutdownChannel close(t.ShutdownChannel) } func (t *TelegramDaemon) commandStart(upd *tg.Update, sects []string, lang string) { content := t.app.storage.lang.Telegram[lang].Strings.get("startMessage") + "\n" content += t.app.storage.lang.Telegram[lang].Strings.template("languageMessage", tmpl{"command": "/lang"}) err := t.Reply(upd, content) if err != nil { t.app.err.Printf("Telegram: Failed to send message to \"%s\": %v", upd.Message.From.UserName, err) } } func (t *TelegramDaemon) commandLang(upd *tg.Update, sects []string, lang string) { if len(sects) == 1 { list := "/lang ``\n" for code := range t.app.storage.lang.Telegram { list += fmt.Sprintf("`%s`: %s\n", code, t.app.storage.lang.Telegram[code].Meta.Name) } err := t.Reply(upd, list) if err != nil { t.app.err.Printf("Telegram: Failed to send message to \"%s\": %v", upd.Message.From.UserName, err) } return } if _, ok := t.app.storage.lang.Telegram[sects[1]]; ok { t.languages[upd.Message.Chat.ID] = sects[1] for jfID, user := range t.app.storage.telegram { if user.ChatID == upd.Message.Chat.ID { user.Lang = sects[1] t.app.storage.telegram[jfID] = user if err := t.app.storage.storeTelegramUsers(); err != nil { t.app.err.Printf("Failed to store Telegram users: %v", err) } break } } } } func (t *TelegramDaemon) commandPIN(upd *tg.Update, sects []string, lang string) { tokenIndex := -1 for i, token := range t.tokens { if upd.Message.Text == token { tokenIndex = i break } } if tokenIndex == -1 { err := t.QuoteReply(upd, t.app.storage.lang.Telegram[lang].Strings.get("invalidPIN")) if err != nil { t.app.err.Printf("Telegram: Failed to send message to \"%s\": %v", upd.Message.From.UserName, err) } return } err := t.QuoteReply(upd, t.app.storage.lang.Telegram[lang].Strings.get("pinSuccess")) if err != nil { t.app.err.Printf("Telegram: Failed to send message to \"%s\": %v", upd.Message.From.UserName, err) } t.verifiedTokens = append(t.verifiedTokens, TelegramVerifiedToken{ Token: upd.Message.Text, ChatID: upd.Message.Chat.ID, Username: upd.Message.Chat.UserName, }) t.tokens[len(t.tokens)-1], t.tokens[tokenIndex] = t.tokens[tokenIndex], t.tokens[len(t.tokens)-1] t.tokens = t.tokens[:len(t.tokens)-1] }