How to set identifier on firebase authentication via custom token? - firebase

Question

I just implemented the linkedin signup & login using firebase custom auth system through this https://firebase.google.com/docs/auth/admin/create-custom-tokens
It`s working but identifier on firebase is null.
How should I send it? Should I update it after creating the user?
I want to save it on create.
Thanks

Answer 1

Try this:
On your server, before minting the custom token, you can create the user with the email:
// Create the user with email first.
admin.auth().createUser({uid: uid, email: linkedinEmail})
.then(function(userRecord) {
// This will return custom token for that user above.
return admin.auth().createCustomToken(userRecord.uid);
})
.catch(function(error) {
// Some error.
});
Another option using client side code, is to set the email client side after signing in with custom token:
firebase.auth().signInWithCustomToken(customToken)
.then(function(result) {
return firebase.auth().currentUser.updateEmail(linkedinEmail);
})
.catch(function(error) {
// Some error occurred.
});

Answer 2

while creating custom token generate a unique UID at your own and save it in database
and as when there is someone trying o login with details match the credentials in database and fetch the correct UID and create a custom token with it. now with the help of custom token you can login
have a look at the code below
this is a well working code from my node.js project
const functions = require('firebase-functions');
const admin = require('firebase-admin');
module.exports = functions.https.onRequest((req, res) => {
//make a random and distinct uid
//and save it in database with the users credentials
//match them at the time of login
admin.auth().createCustomToken(uid)
.then(function(customToken) {
res.setHeader('Content-Type', 'application/json');
var error = false;
var result = {
"Error": error,
"CustomToken": customToken
};
res.send(JSON.stringify(result));
})
.catch(function(err) {
res.setHeader('Content-Type', 'application/json');
var error = true;
var result = {
"Error": error,
"Message": err
};
res.send(JSON.stringify(result));
});
});