Discord Mirror

Mirrors Discord messages to a Slack channel. Designed to run on a schedule via Tower.

The app automatically prevents duplicate messages by checking the Tower API for the last successful run time and only posting messages that appeared after that time.

Setup

1. Create a Discord Bot Token

1. Go to the Discord Developer Portal
2. Create a new application or select an existing one
3. Go to the "Bot" section and create a bot
4. Copy the bot token
5. Enable "Message Content Intent" in the Bot settings
6. Invite the bot to your server with appropriate permissions (Read Messages, Read Message History)

2. Get Discord Channel IDs

1. Enable Developer Mode in Discord (Settings -> Advanced -> Developer Mode)
2. Right-click on each channel you want to mirror
3. Click "Copy ID"
4. You can mirror multiple channels by providing a comma-separated list of IDs

3. Create a Slack Webhook

1. Go to your Slack workspace settings
2. Navigate to Apps -> Incoming Webhooks
3. Create a new webhook for the target channel
4. Copy the webhook URL

4. Store Discord Bot Token as a Secret

tower secrets create --name DISCORD_BOT_TOKEN --value <your-bot-token>

5. Create a Schedule

Run every 5 minutes:

tower schedules create \
  --app discord-mirror \
  --cron "*/5 * * * *"

Manual Testing

Test the app manually before scheduling:

tower run

Configuration

The app uses the following configuration:

Secrets (store with tower secrets create):

• DISCORD_BOT_TOKEN - Discord bot authentication token
• SLACK_WEBHOOK_URL - Slack webhook URL to post messages to

Parameters (pass at runtime):

• DISCORD_CHANNEL_IDS - Comma-separated list of Discord channel IDs to fetch messages from (e.g., 123456789,987654321)