Directus v8 to Slack Webhook translator

Tiny service which translates incoming webhooks from Directus v8 to Slack webhooks.

Expected format of incoming webhooks:

URL: https://example.org/{userKey}/{objectTypeName}/{SLACK_WEBHOOK_SECRET} where

• https://example.org: where this service is deployed
• userKey: secret for authentication, is checked against (hashed) KEY_HASH
• objectTypeName: e.g. "anlage", directus collection name (otherwise we have no way to know what object type was modified)
• SLACK_WEBHOOK_SECRET: secret URL path from Slack webhook URL, for example T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX in the Slack docs

For example, the full URL for a anlage Webhook would be: https://example.org/my_secret_key/anlage/0O2JR73BDQ0M/9P4HEOWEVOX/F9NMD2SB3HA2ZXNBGIHAASHD37

Body:

{"prop_which_changed":"new contents","id":"1234","modified_on":"2022-05-05 20:20:15","modified_by":123}

Deployment

Deploy this as a Docker image.

docker build -t 'mova21-directus2slack-webhooks' .
docker run -it --rm -e KEY_HASH=$(go run ./cmd/hash/ MY_SECRET_KEY) mova21-directus2slack-webhooks

Config options are accepted as env vars. The only required one is KEY_HASH. To hash a key, you can use go run ./cmd/hash/ <KEY>.

Development

For testing, you can run this locally and use localtunnel or ngrok for forwarding from Directus.

KEY_HASH=$(go run ./cmd/hash/ MY_SECRET_KEY) go run ./cmd/server/
yarn add localtunnel
yarn run lt --port 8080