Slack Bot Mention Edge Function - Supabase

The Slack Bot Mention Edge Function allows you to process mentions in Slack and respond accordingly.

Configuring Slack apps

For your bot to seamlessly interact with Slack, you'll need to configure Slack Apps:

Navigate to the Slack Apps page.
Under "Event Subscriptions," add the URL of the slack-bot-mention function and click to verify the URL.
The Edge function will respond, confirming that everything is set up correctly.
Add app-mention in the events the bot will subscribe to.

Creating the Edge Function

Deploy the following code as an Edge function using the CLI:

bash

supabase --project-ref nacho_slacker secrets \
set SLACK_TOKEN=<xoxb-0000000000-0000000000-01010101010nacho101010>

Here's the code of the Edge Function, you can change the response to handle the text received:

import { WebClient } from 'https://deno.land/x/[email protected]/mod.js'

const slackBotToken = Deno.env.get('SLACK_TOKEN') ?? ''
const botClient = new WebClient(slackBotToken)

console.log(`Slack URL verification function up and running!`)
Deno.serve(async (req) => {
  try {
    const reqBody = await req.json()
    console.log(JSON.stringify(reqBody, null, 2))
    const { token, challenge, type, event } = reqBody

    if (type == 'url_verification') {
      return new Response(JSON.stringify({ challenge }), {
        headers: { 'Content-Type': 'application/json' },
        status: 200,
      })
    } else if (event.type == 'app_mention') {
      const { user, text, channel, ts } = event
      // Here you should process the text received and return a response:
      const response = await botClient.chat.postMessage({
        channel: channel,
        text: `Hello <@${user}>!`,
        thread_ts: ts,
      })
      return new Response('ok', { status: 200 })
    }
  } catch (error) {
    return new Response(JSON.stringify({ error: error.message }), {
      headers: { 'Content-Type': 'application/json' },
      status: 500,
    })
  }
})