database.rules.json

{
  "rules": {

    "rooms_private": {
      "$room": {
        ".read": "data.child('uid_admins').hasChild(auth.uid)",
        ".write": "data.child('uid_admins').hasChild(auth.uid)",
        ".validate": "newData.hasChildren(['uid_admins', 'uid_participants'])",

        "uid_admins": {
          "$uid": { ".validate": "newData.isBoolean()" }
        },

        "uid_participants": {
          "$uid": {
            ".read": "$uid === auth.uid",
            
            "$day": {
              "$time": { ".validate": "newData.isNumber() && newData.val() >= -2 && newData.val() <= 2" }
            }
          }
        },

        "$other": { ".validate": false }
      }
    },

    "rooms_public": {
      "$room": {
        ".read": true,
        ".write": "root.child('rooms_private').child($room).child('uid_admins').hasChild(auth.uid)",
        ".validate": "newData.hasChildren(['description', 'enabled', 'name', 'urlImage'])",

        "description": { ".validate": "newData.isString() && newData.val().length < 120" },
        "enabled": { ".validate": "newData.isBoolean()" },
        "name": { ".validate": "newData.isString() && newData.val().length < 70" },
        "urlImage": { ".validate": "newData.isString() && newData.val().length < 2000" },

        "created": { ".validate": "newData.isNumber()" },
        "$other": { ".validate": false }
      }
    },

    "users_private": {
      "$uid": {
        ".read": "$uid === auth.uid",
        ".write": "$uid === auth.uid",
        ".validate": "newData.hasChild('ids_rooms_as_participant')",

        "ids_rooms_as_participant": {
          "$room": { ".validate": "newData.isBoolean()" }
        },

        "$other": { ".validate": false }
      }
    },

    "users_public": {
      "$uid": {
        ".read": true,
        ".write": "$uid === auth.uid",
        ".validate": "newData.hasChildren(['email', 'name', 'urlImage'])",

        "email": { ".validate": "newData.isString() && newData.val().length <= 254" },
        "name": { ".validate": "newData.isString() && newData.val().length <= 70" },
        "urlImage": { ".validate": "newData.isString() && newData.val().length <= 2000" },

        "creationTime": { ".validate": "newData.isString()" },
        "emailVerified": { ".validate": "newData.isBoolean()" },
        "lastSignInTime": { ".validate": "newData.isString()" },
        "nameGoogle": { ".validate": "newData.isString() && newData.val().length <= 70" },
        "urlImageGoogle": { ".validate": "newData.isString() && newData.val().length <= 2000" },
        "$other": { ".validate": false }
      }
    }

  }
}