Verify anonymous user display name in real-time Firebase database rules

Question

I set the display name for anonymous users and want the new values ​​to match this display name of the set. The following rule fails:

"name": { ".validate": "newData.val() == auth.token.name" }

Why is this? docs say the display name is stored in auth.token.name.

Below is a complete copy of my firebase rules:

{
    "rules": {
    ".read": false,
    ".write": false,
    "messages": {
        ".read": true,
        "$message": {
            ".write": "auth != null",
            ".validate": "newData.hasChildren(['createdAt', 'text', 'user'])",

            "createdAt": { ".validate": "newData.val() == now" },
            "text": { ".validate": "newData.isString() && newData.val().length > 0" },
            "user": {
                ".validate": "newData.hasChildren(['_id', 'name'])",
                 "_id": { ".validate": "newData.val() == auth.uid" },
                 "name": { ".validate": "newData.val() == auth.token.name" },
            "$other": { ".validate": false }
        },
        "$other": { ".validate": false }
      }
    }
  }
}

Answer 1

As I mentioned in the comments (took this from the documentation ):

. , . .

, , .write:false node . , ​​:

{
    "rules": {
    ".read": false,
    "messages": {
        ".read": true,
        "$message": {
            ".write": "auth != null",
            ".validate": "newData.hasChildren(['createdAt', 'text', 'user'])",

            "createdAt": { ".validate": "newData.val() == now" },
            "text": { ".validate": "newData.isString() && newData.val().length > 0" },
            "user": {
                ".validate": "newData.hasChildren(['_id', 'name'])",
                 "_id": { ".validate": "newData.val() == auth.uid" },
                 "name": { ".validate": "newData.val() == auth.token.name" },
            "$other": { ".validate": false }
        },
        "$other": { ".validate": false }
      }
    }
  }
}

auth.token.name. " " , :

{
  "provider": "anonymous",
  "uid": "N4EbtSX5HbM9JLjsW6hWT3NWzAx1"
}

, name, auth.token.name null, .

, "" "", , :

{
  "provider": "anonymous",
  "uid": "N4EbtSX5HbM9JLjsW6hWT3NWzAx1",
  "token":{
    "name": "Mike"
  }
}

, , , :

{ 
    "createdAt": { 
        ".sv": "timestamp" 
    }, 
    "text": "Test 1", 
    "user": 
    { 
        "_id": "48c83bf9-7354-4720-838f-8b68e0addd51", 
        "name": "Mike"
    }
}