Firebase rule auth.token.email is not working: “Simulated write denied”

Question

https://firebase.google.com/docs/reference/security/database/#authtokenF

{
  \"rules\": {
    \"c\":{
      \".write\":\"newData.child(\'email\').val()=== au         


        

Answer 1

It looks like you're not providing an email address in the authentication data.

When you select a provider, the simulator shows the exact auth.token payload that it will use. For the Google provider my Auth token payload looks like this:

The simulator takes the literal JSON that is shown in here, and uses it as auth.token.

{
  "provider": "google",
  "uid": "27e08474-4e33-460d-ba92-ba437c6aa962"
}

Since there is no email provided, your rules (correctly) fail.

For testing this scenario, you'll want to switch to a custom provider, so that you can specify your own auth token with an email property: