Edge Functions

Slack Bot Mention Edge Function

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:

  1. Navigate to the Slack Apps page.
  2. Under "Event Subscriptions," add the URL of the slack-bot-mention function and click to verify the URL.
  3. The Edge function will respond, confirming that everything is set up correctly.
  4. 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:

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supabase --project-ref nacho_slacker secrets \
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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:

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import { WebClient } from 'https://deno.land/x/slack_web_api@6.7.2/mod.js'
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import { withSupabase } from 'npm:@supabase/server@^1'
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const slackBotToken = Deno.env.get('SLACK_TOKEN') ?? ''
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const botClient = new WebClient(slackBotToken)
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console.log(`Slack URL verification function up and running!`)
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// Slack calls this endpoint, so deploy with --no-verify-jwt.
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export default {
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  fetch: withSupabase({ auth: 'none' }, async (req) => {
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    try {
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      // Implement your Slack request signature verification here before trusting the payload
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      // (validate `x-slack-signature` / `x-slack-request-timestamp` with your signing secret).
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      const reqBody = await req.json()
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      console.log(JSON.stringify(reqBody, null, 2))
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      const { token, challenge, type, event } = reqBody
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      if (type == 'url_verification') {
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        return Response.json({ challenge })
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      } else if (event.type == 'app_mention') {
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        const { user, text, channel, ts } = event
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        // Here you should process the text received and return a response:
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        const response = await botClient.chat.postMessage({
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          channel: channel,
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          text: `Hello <@${user}>!`,
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          thread_ts: ts,
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        })
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        return new Response('ok', { status: 200 })
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      }
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    } catch (error) {
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      return Response.json({ error: error.message }, { status: 500 })
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    }
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  }),
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}