{
  "events": {
    "08asd980kadkadslk": {
      "metadata": {
        "icon": "eject",
        "text": "something and something and something",
        "timestamp": "2017-01-17T04:58:40.567Z"
      },
      "viewers": {
        "UYUYT0CKu4gf34kpw1": true
      }
    }
    "abcdef": {
       "metadata": {
        "icon": "eject",
        "text": "This should not be returned",
        "timestamp": "2016-01-17T04:58:40.567Z"
      },
      "viewers": {
        "zyzdef": true
      }
  }
}

{
  "rules": {
    // ".write": "auth != null",
      "events": {
        // ".read": "auth != null",
        "$eventId": {
          "metadata" : {
                ".read": "data.parent().child('viewers').hasChild( auth.uid )"
          },
          "viewers" : {
            "$uid" : {
              ".read": "auth.uid === $uid",
                ".write": "auth.uid === $uid"
            }
          }
        }
      }
  }
}