Using Microsoft Bot Framework, when I write on Messenger channel, how to push the result to a specific Slack channel ? (with Node)

Currently my users are using a Messenger channel.

Here is what it goes: my users type "Talk to a coach" in my bot, then they can write whatever they want, and then the result should be pushed to a specific private channel using Slack.

How can I achieve that ?

EDIT: The private channel is a list of users request that can be processed when coaches are available, so users don't have to be in a waiting list

Solution

I achieved it using directly Slack API. I tried with .sourceEvent, and it nearly worked: the bot only talked to me in private on Slack, he didn't accept any channel ID / name (private or not).

Here is how I made it to work (a bit factorized): It starts with the user wanting to change anything in his planning (which has to be done manually by a coach), so it starts in dialog "/select_modify_planning"

app.js:

...

bot.dialog("/select_modify_planning", require("./dialogs/modifyPlanning").select);
bot.dialog("/ask_for_request", require("./dialogs/modifyPlanning).askForRequest);

...

modifyPlanning.js:

const builder = require('botbuilder');
const rp = require('request-promise');

...

exports.select = [
 (session, args) => {
   session.sendTyping();
   builder.Prompts.choice(session, "What do you want to declare ? :)", "Internal hours|Update rendezvous");
 },
 (session, results) => {
  if (results.response) {
    switch (results.response.entity) {
      case "Internal hours":
        session.beginDialog("/ask_for_request");
        break;
      case "Update rendezvous":
        ...
    }
  }
]

...

exports.askForRequest = [
 (session, args) => {
   session.sendTyping();
   builder.Prompts.text(session, "Type your demand please:");
 },
 async (session, results) => {
   try {
     if (results.response)
       await sendRequestToSlack(results.response);
       session.endDialog("Your demand has been sent successfully, thank you ;)");
   }
   .catch(err) {
     console.error(err);
     session.endDialog("There was a problem while sending your demand to a coach, sorry :(");
   }
 }
]

...

const sendRequestToSlack = (textToSend) => {
  var options = {
    uri: "https://slack.com/api/chat.postMessage",
    form: {
      "token": "xoxb-XXXXXX-XXXXXX", // Your bot slack token
      "channel": "XXXXXXXXX", // Your channel id (or name)
      "text": textToSend
    },
    headers: {
      'content-type': 'application/x-www-form-urlencoded'
    }
  }
  return rp.post(options);
}

...

And here it is.

If you want to know your channels ID (using name is a bad practice because they can be changed), you can use this method: https://api.slack.com/methods/channels.list for public channels, or this one: https://api.slack.com/methods/groups.list for private channels.

If it's for private channels, you have to add good permissions in your bot scope settings ( groups.xxx ), and reinstall it (you have a green button dedicated to in bots settings)

Hope everything is clear :)