Slack Notifier

A command line tool and a GitHub Action to post message notifications to Slack.

This app uses the latest recommended, non-legacy Slack API to post messages, including Block Kit for the messages.

GitHub Action

See action.yml for details on inputs and outputs.

Example:

- uses: ronny/slacknotifier@v1
  with:
    slack-token: ${{ secrets.SLACK_TOKEN }}
    bot-name: deploybot
    bot-icon-emoji: ":mega:"
    channel-id: "C12345"
    message: "Deployed `todo-service`"
    message-context: "Env: `production` | By: `${{ github.actor }}` | Commit: `${{ github.sha }}`"

You can also use the docker image directly, but you need to specify all of the inputs including the ones that have default values in action.yml.

- uses: docker://ronny/slacknotifier:1
  with:
    slack-token: ${{ secrets.SLACK_TOKEN }}
    bot-name: deploybot
    bot-icon-emoji: ":mega:"
    channel-id: "C12345"
    message: "Deployed `todo-service`"
    message-context: "Env: `production` | By: `${{ github.actor }}` | Commit: `${{ github.sha }}`"
    # These are the defaults:
    markdown: 'true'
    replace-timestamp: ''
    timeout: 30s

CLI tool

go install github.com/ronny/slacknotifier/cmd/slack-notify
$GOPATH/bin/slack-notify

Or, if you have the source locally:

make install
$GOPATH/bin/slack-notify

Slack token

The recommended token type is a bot token. Follow the guide to create a new Slack app, the scopes needed are: chat:write, chat:write.public (if you want the bot to be able to post messages without being invited to a channel), and chat:write.customize (if you want to customize the bot's name and icon in a step).

Once you created your app, you can find the bot token from the "OAuth & Permissions" section of your app, the URL of the page looks like https://api.slack.com/apps/Axxxxxxxx/oauth.

Channel ID

It’s recommended to use a channel’s canonical ID, which can be found at the bottom of the pop-up dialog when you click a channel’s name.

Using #name or just name sometimes work, but not when updating/replacing a message. So it’s best to use the canonical channel ID always.