Question 120053 in Firebase Question posted in
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Firebase – How can I access firestore data before authenticating phone number?

In my flutter app I want to create a phone authentication for sign up, with one condition that only those phone numbers, which are already been stored in firestore database can sign up.. ….. How can I access firestore data before signing in?

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2

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  1. 0

    You can create a rule set for firebase access on the firebase application console.

    This is a good place to look:

    Firestore Security Rules Docs

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  2. 0

    Register a blocking function for beforeCreate event and check that a user’s phoneNumber is in a list of allowed numbers. If not throw an error.

    Triggers before a new user is saved to the Firebase Authentication database, and before a token is returned to your client app.

    const functions = require('firebase-functions');

exports.beforeCreate = functions.auth.user().beforeCreate((user, context) => {
  // TODO check user.phoneNumber againts allowed ones
});

    See Extend Firebase Authentication with blocking Cloud Functions for details.

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