database.rules.json

{
  "rules": {
    ".read": false,
    ".write": false,
    "checkAccess": {
      ".read": "auth != null && root.child('admins').hasChild(auth.uid)",
      ".write": false
    },
    "admins": {
      ".read": true,
      ".write": false
    },
    "rooms": {
      ".read": true,
      ".write": "auth != null && root.child('admins').hasChild(auth.uid)"
    },
    "sessions": {
      ".read": true,
      ".write": "auth != null && root.child('admins').hasChild(auth.uid)"
    },
    "speakers": {
      ".read": true,
      ".write": "auth != null && root.child('admins').hasChild(auth.uid)"
    },
    "tracks": {
      ".read": true,
      ".write": "auth != null && root.child('admins').hasChild(auth.uid)"
    },
    "in" :{
      "rooms": {
      	".read": true,
      	".write": "auth != null && root.child('admins').hasChild(auth.uid)"
      },
      "sessions": {
      	".read": true,
      	".write": "auth != null && root.child('admins').hasChild(auth.uid)"
      },
      "speakers": {
      	".read": true,
      	".write": "auth != null && root.child('admins').hasChild(auth.uid)"
      },
      "tracks": {
      	".read": true,
      	".write": "auth != null && root.child('admins').hasChild(auth.uid)"
      }
    }
  }
}