Firebase 'internal' error when using Functions and Admin

Question

I am having trouble with some functions that have been working previously. I have created a function to let the user create another user and it was working fine. Functions that do not use Admin works fine just as before.

However, due to some Firebase updates, the function broke and I am getting an 'internal' error. I had to change import firebase from "firebase/app"; to import firebase from "firebase/compat/app"; as well as import "firebase/compat/functions"; but that did not work, as well as updating firebase to "^9.8.1", but that did not work either.

Here is my web function:

async registerUser(userInfo) {
    const functions = getFunctions();
    const createUser = httpsCallable(functions, "createUser");
      // Used to have this: 
      // let createUser = firebase.functions().httpsCallable("createUser");

    //Call to function where it breaks.
    return await createUser({
       //User data here
    })
      .then( 
    //stuff happens here
    ).catch((error) => {
      //Error happens here
})
}

Here is the function that was already deployed in Firebase:

const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

  exports.createUser = functions.https.onCall(async (userData) => {
    return await admin
    .auth()
    .createUser(userData)
    .then(() => {
      return { isError: false };
    })
    .catch((error) => {
      return { isError: true, errorMessage: error };
    });
});

Here is the response log:

Request Method: OPTIONS
Status Code: 403 
Referrer Policy: strict-origin-when-cross-origin
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"
content-length: 305
content-type: text/html; charset=UTF-8
date: Tue, 24 May 2022 16:04:14 GMT
server: Google Frontend

Answer 1

You can refer to the Admin SDK error handling page and check the Structure of the error, the refer to policy: strict-origin-when-cross-origin part gives us a good starting point.

But first, we can see the root cause of this issue as in the same page we have a table for Platform error codes where:

INTERNAL | Internal server error. Typically a server bug.

In the Firebase Admin Authentication API Errors we have a similar table where:

auth/internal-error | The Authentication server encountered an unexpected error while trying to process the request. The error message should contain the response from the Authentication server containing additional information. If the error persists, please report the problem to our Bug Report support channel.

Now talking about the cors message, this question suggests:

Consider importing like this, as shown in the samples:

const cors = require('cors')({origin: true});

And the general form of your function will be like this:

 exports.fn = functions.https.onRequest((req, res) => {
   cors(req, res, () => {
       // your function body here - use the provided req and res from cors
   })
});

You might need to make some changes to the structure as the question has some time, so I will also leave the reference to the Call functions via HTTP requests and check if it works for you.

I will follow up if you provide updates and consider submitting a bug report as previously mentioned by the documentation if this is necessary.