HarperDB ACL-Connect

This component allows you define a set of topics for pub/sub (MQTT) with ACLs specifying permissions.

To use this, add @harperdb/acl-connect to your projects dependencies and then add this extension to your application's config.yaml:

acl-connect:
  package: "@harperdb/acl-connect"
  database: data # The database to use for pub/sub
  file: connect.json

And connect.json should be a JSON file with the following format:

{
  "acls": [
    {
      "topicFilter": "topic/sub-topic/#",
      "publishers": [
        "a-group",
        "another-group"
      ],
      "subscribers": [
        "another-group"
      ]
    },
    ...
  ]
}

Topics support substitution with %u for the user's username and %c for the client id. For example, a topic of user/%u would be translated to user/smith for a user with the username smith.

Anonymous Subscriptions

In order for anonymous subscriptions to work correctly:

requireAuthentication must be set to false in your harper config. For example:

# In harperdb-config.yaml
mqtt:
    requireAuthentication: false