Verify Firebase Token on Apollo Node.js backend?

2022-05-04 10:04 HavanaSun imported from Stackoverflow

After user signs in on my Android App with Firebase I want to send the Firebase Token as a String param via GraphQL Mutation. Then receive it on my Express.js API inside the GraphQL mutation resolver and verify the token with the Firebase Admin SDK.

I have no idea if this is the correct way, all I want is to get the UID from the Token and check with Prisma if the UID is already existing on my MySQL User Table, if not then create a new user.

This should be done whenever the user inside the app uploads a new file, likes a post, comments etc.

I have absolutely no Idea if this is the way to do it.

Here is my Firebase Object (firebaseApp.js):

const admin = require('firebase-admin')  
const serviceAccount = require("./.firebase/service-account.json"); 

const firebaseApp =
  global.firebaseApp ??
  admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
  })

// store on global object so we can reuse it if we attempt
// to initialize the app again
global.firebaseApp = firebaseApp

Here is my Mutation Resolver:

const db = require('../firebaseApp')  



module.exports = { 
  Mutation: {
    
    authenticateUser: async (parent, { token }) => {


      db.auth().verifyIdToken(token)
      .then((decodedToken) => {
        const uid = decodedToken.uid;
        return {
          message: "User is authenticated: " + uid
        }
      })
      .catch((error) => {
        return {
          message: "User is not authenticated: "  
        }
      }); 
    }
  }
}

Here is the output when I try to send a token with the mutation:

db.auth is not a function

I have the strong feeling that I have a big misconception in my head and that this is aboslutely not the way to do it, I literally cannot find anything on the internet which explains this using my tech stack (Apollo GraphQL, Node.js, Prisma) Would appreciate some help

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console.log(firebaseConfig.storageBucket); ==========> undefined 
console.log(firebaseConfig.measurementId); ==========> undefined 
console.log(firebaseConfig.appId); ==========> undefined 
console.log(firebaseConfig.measurementId); ==========> undefined

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    at Module../src/firebase.init.js (firebase.init.js:22:1)
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Error were occurred, i was unable to solve it due to this error message

error - image

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