Autoposting comment to Slack but it's not replying in thread to the message timestamp provided

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I looked into this and it’s fairly simple to implement this using the HTTP node and the Slack API. Here’s a mini-howto:

Lookup the Slack API Documentation

I looked at Slack’s documentation and found the chat.postMessage documentation.

Key elements from this page:

  1. Method access: POST https://slack.com/api/chat.postMessage
  2. Required scopes: we’ll re-use our existing Slack authentication, so this has already been taken care of.
  3. Content types: application/x-www-form-urlencoded - this defines how to structure the POST request - we’ll see this in our HTTP node settings below.

Arguments:

  1. token - this is listed as required, but I found that when using the oAuth2 authentication you can skip it.
  2. channel - you may already have this as output from your previous nodes. If not, you can get it from the Slack client by right-clicking on the channel name and selecting ‘Copy Link’. This link will look something like https://domain.slack.com/archives/C12345678D - your channel ID would be C12345678D.

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  1. thread_ts - this contains the timestamp of the message that you want to reply to in-thread. Again, you probably already have this. If not, right-click on a message’s timestamp to copy the link. This link will look like https://domain.slack.com/archives/CHANNEL_ID/p1712219522769369. The numerical part is the timestamp, and it needs to be slightly reformatted to 1712219522.769369 for it to work in the API.

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Set up the HTTP node

Add an HTTP node and set the fields as shown in the screenshot below!

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And it worked!

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I hope you’ll find this workaround is useful - we realize this is a good feature to add and hope to be able to add this soon-ish.

Also, I’d like to plug our upcoming Community Hangout of April 12 here as this is exactly the kind of thing that we’ll be covering there :slight_smile:

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