Firebase rules for http://eric.pdxhub.org/things/angularfire/

firebase_rules.json

{
  "rules": {
    ".read": true,
    "messages": {
      ".read": true,
      "$msg": {
        ".validate": "newData.child('user_id').val() == auth.id && newData.child('provider').val() == auth.provider",
        ".write": "!data.exists() && auth != null"
      }
    }
  }
}