Cloud Functions for Firebase - Get current user id [duplicate]

Answer 1

First you can get the current signed-in user tokenId by calling getIdToken() on the User: https://firebase.google.com/docs/reference/js/firebase.User#getIdToken

firebase.auth().currentUser.getIdToken(true)
.then(function (token) {
    // You got the user token
})
.catch(function (err) {
    console.error(err);
});

Then send it to your cloud function.

Then in your cloud function you can use: https://firebase.google.com/docs/auth/admin/verify-id-tokens

Example:

admin.auth().verifyIdToken(idToken)
  .then(function(decodedToken) {
    var uid = decodedToken.uid;
    // ...
  }).catch(function(error) {
    // Handle error
  });

The documentation for decodedToken is here: https://firebase.google.com/docs/reference/admin/node/admin.auth.DecodedIdToken#uid

DecodedIdToken contains the user uid, then you can get the user by calling this: https://firebase.google.com/docs/reference/admin/node/admin.auth.Auth#getUser

Which returns a UserRecord https://firebase.google.com/docs/reference/admin/node/admin.auth.UserRecord