telegram.md

Simple Telegram Bot:

follow these instructions to get a simple Telegram Bot setup

Getting Started

1. Open telegram chat in your browser or mobile phone
2. Add the user BotFather
3. Click start
4. Click /newbot
5. Follow the Instructions

Getting the Token

1. Wait for the Token to be displayed referred to as [myauthorization-token]
2. Go to the Administration Portal of Rocket.Chat and the Integrations Page
3. Create a new Incoming Webhook following these instructions
   • Enable script
   • Paste the following

Incoming Webhook for Rocket.Chat

class Script {
    addQuotePrefix(str) {
        let tmp = str.split('\n'),
            res = [];

        for (const frag of tmp) {
            res.push(`> ${frag}`);
        }

        return res.join('\n');
    }

    process_incoming_request({ request }) {
        // UNCOMMENT THE BELOW LINE TO DEBUG IF NEEDED.
        // console.log(request.content);
        if ('edited_message' in request.content) {
            request.content.message = request.content.edited_message;
        }
        let from = request.content.message.from;
        let who = from.username
        let icon_url = '/avatar/' + from.username + '.jpg'
        if(!who)  {
          if (from.first_name && from.last_name) {
            who = `${from.first_name} ${from.last_name}`
          } else if (from.first_name) {
            who = from.first_name
          } else {
            who = from.last_name
          }
          icon_url = `/avatar/${request.content.message.from.first_name}.jpg`
        }
        let body = request.content.message.text

        if(!body) {
          if(request.content.message.hasOwnProperty("sticker") && request.content.message.sticker.emoji) {
            // It's a sticker
            body = request.content.message.sticker.emoji
        } else {
           return {}
          }
        }

        if(request.content.message.reply_to_message) {
              var quotedMessage = 
                "*" +
                request.content.message.reply_to_message.from.username +
                "*\n" +
                request.content.message.reply_to_message.text;

              quotedMessage = this.addQuotePrefix(quotedMessage);
            body = quotedMessage + '\n' + body;
        }

        return {
            content: {
                username: who,
                icon_url: icon_url,
                text: body
            }
        };
    }
}

Letting Telegram Know About Rocket.Chat's WebHook

1. Copy incoming webhook URL from Rocket.Chat
2. Change following URL with your token and Incoming webhookURL and execute in regular browser https://api.telegram.org/bot[myauthorization-token]/setwebhook?url=[Incoming_Webhook_Link_from_Rocket.Chat]
3. Receive the message { "ok": true, "result": true, "description": "Webhook successfully set" } (or similar)
4. Test your incoming Webhook by sending a telegram message to the bot. It should be posted in the channel/user you specified in the incoming webhook. Check Rocket.Chat's Logs and write down chat_id (or [chat-id])

Create Outgoing WebHook in Rocket.Chat

1. Create outgoing webhook and specify channel with the following url: https://api.telegram.org/bot[myauthorization-token]/sendMessage?chat_id=[chat-id]
2. Paste the Outgoing Webhook below.
3. Enable listening at the Bot with /privacy and to disable (example)
4. Add Bot to telegram group and utilize nice cross platform communication.

class Script {
    prepare_outgoing_request({ request }) {
        if (request.data.bot) {
            //Don't repost messages from the bot.
            return { };
        } else {
            return {
                url: request.url + '&parse_mode=HTML' + '&text=' + encodeURIComponent('<b>' + request.data.user_name+ '</b>: ' + request.data.text),
                method: 'GET'
            };
        }
    }
}

Conclusion

Enjoy! Please note, this was a community submission and is very simple. If you feel there are improvements which can be made, please feel free to submit improvements via pull requests!! ❤️