Duplicati + Discord Cloudflare Worker

If you want to send notifications from your (self-hosted) Duplicati instance to Discord, then you can deploy this Cloudflare worker to your Cloudflare account. When called, it modifies the incoming Duplicati notification data and sends an embedded message to a Discord webhook URL.

Instructions

1. Mostly automatic

2. Manual

1. Clone this repository and install the dependencies with pnpm install
2. Deploy the Cloudflare worker to your account by running pnpm run deploy

Steps after worker is deployed

1. Get webhook URL for Discord channel

Create a webhook URL for a given Discord channel …

• If you want to post to an ordinary channel, copy the default webhook URL as is. It will be in the following format: https://discord.com/api/webhooks/123…/abcdef…
  Copy the 123…/abcdef… portion of the URL.

• If you want to support Discord threads, create a thread in Discord first. Then copy the link to it by right-clicking it and choose Copy Link.
  The link will be in the form of https://discord.com/channels/123…/987…. Extract the last part after the slash ('/'), i.e. 987… - that's the thread id. Then append this ?thread_id=987… string to the previously defined webhook URL.
  Copy the compounded string 123/abcdef?thread_id=987… to your clipboard.

2. Merge the Cloudflare worker URL with the copied string

This should result in a string similar to https://duplicati-discord-cloudflare-worker.<some_identifier>.workers.dev/123…/abcdef…
Or, for threads: https://duplicati-discord-cloudflare-worker.<some_identifier>.workers.dev/123…/abcdef…?thread_id=987…

3. Update Duplicati configuration

1. Open your Duplicati dashboard and select Edit on the backup you wish to receive notifications for.

2. Navigate to Options and under Advanced options click the three dots to Edit as text.

3. Add the --send-http-json-urls flag with your URL as following:

   --send-http-json-urls=https://url-to-your-worker.com/123…/abcdef…                    # for ordinary channels
   
   --send-http-json-urls=https://url-to-your-worker.com/123…/abcdef…?thread_id=987…     # for thread support
   

4. Save the backup configuration. Run a backup and check if it's working.

4. Set level for sending notifications (optional)

To only receive notifications when a backup results in a warning or error, add this to the options as well (on a separate row)

--send-http-level=Warning,Error,Fatal