Bug report

Describe the bug

There's a problem with the credential in initializing the firebase admin app. It works perfectly with admin.verifyToken, but any other method I try to use yields an error of

Error: Credential implementation provided to initializeApp() via the "credential" property failed to fetch a valid Google OAuth2 access token with the following error: "Error fetching access token: invalid_grant (Invalid grant: account not found)". There are two likely causes: (1) your server time is not properly synced or (2) your certificate key file has been revoked. To solve (1), re-sync the time on your server. To solve (2), make sure the key ID for your key file is still present at https://console.firebase.google.com/iam-admin/serviceaccounts/project. If not, generate a new key file at https://console.firebase.google.com/project/_/settings/serviceaccounts/adminsdk.

I've tried everything. Is there no way to use the firebase admin SDK with anything else in NextJS?

To Reproduce

firebaseAdmin.js

import * as admin from 'firebase-admin'

export const createUser = (email) => {
const firebasePrivateKey = process.env.FIREBASE_PRIVATE_KEY

if (!admin.apps.length) {
admin.initializeApp({
credential: admin.credential.cert({
projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
// https://stackoverflow.com/a/41044630/1332513
privateKey: firebasePrivateKey.replace(/\n/g, '\n'),
}),
databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL,
})
}

return admin.auth().createUser({
email: '[email protected]',
password: 'password'
})
}

export const verifyIdToken = (token) => {
const firebasePrivateKey = process.env.FIREBASE_PRIVATE_KEY
if (!admin.apps.length) {
admin.initializeApp({
credential: admin.credential.cert({
projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
// https://stackoverflow.com/a/41044630/1332513
privateKey: firebasePrivateKey.replace(/\n/g, '\n'),
}),
databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL,
})
}

return admin
.auth()
.verifyIdToken(token)
.catch((error) => {
throw error
})
}

Try to run createUser from an API endpoint

Expected behavior

It should just work. I need a custom flow for creating my users.

System information

• Mac.OS
• Node '12.16.1'
• NextJS - latest