Create a Firebase user from an authenticated Cloud Functions HTTPS endpoint.

create_user_functions.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
const express = require('express');
const cookieParser = require('cookie-parser')();
const cors = require('cors')({origin: true});
const app = express();

// See https://github.com/firebase/functions-samples/blob/Node-8/authorized-https-endpoint/functions/index.js
const validateFirebaseIdToken = require('./validateFirebaseIdToken');

app.use(cors);
app.use(cookieParser);
app.use(validateFirebaseIdToken);
app.get('/createUser', (req, res) => {
  
  const userData = req.params;
  
  // This represents some criteria you set for determining who can call this endpoint
  // possible a list of approved uids in your database?
  if( req.user.uid !== VALID_ADMIN_USER ) {
    res.status(401).send('Unauthorized');
    return;
  }
  
  // See https://firebase.google.com/docs/auth/admin/manage-users#create_a_user
  
  admin.auth().createUser({
    email: userData.email,
    displayName: userData.name,
    ...
  })
    .then(function(userRecord) {
      // See the UserRecord reference doc for the contents of userRecord.
      res.json({result: 'success', uid: userRecord.uid});
      console.log("Successfully created new user:", userRecord.uid);
    })
    .catch(function(error) {
      console.error("Failed to create new user");
      console.error(error);
      res.status(500).json({status: 'error', error: 'Unable to process the request'});
    });
  
});

// This HTTPS endpoint can only be accessed by your Firebase Users.
// Requests need to be authorized by providing an `Authorization` HTTP header
// with value `Bearer <Firebase ID Token>`.
exports.app = functions.https.onRequest(app);

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