Need help using customToken to login for RTDB data push

[69thPi]

Hello everyone,
I have gone through the examples given but I am still confused on the usage of Custom Tokens.
As per what I understand, I need to generate a customToken and use it to login, upon which the firebase will return a IDToken which I then have to use to get acess to the RTDB to push data. Is this right? I am unable to program it.
I do apologize in advance as I do not have much experience with firebase.

Can someone please share an example of using the CustomToken to generate and IDToken and get access to RTDB and push data to it?

[mobizt]

Why you need to use CustomToken?

You should read the library documentation to understand the basic concept and authentication supports.

For CustomToken, you have to understand the JWT token and how to generate it otherwise, you should not use it.

[69thPi]

I wish that were possible man. My boss needs this done either way, so, I am stuck here. I did read all the documentation and the athorisation concepts including JWT. Your suggestion helped. I have deployed a cloud function to generate a customToken using a UID. Now I just need help to login and edit the database. I tried the CustomToken example and I AM getting a IDtoken and a refresh token but the UID is blank. I assign the refresh token to a new IDtoken and reinitiate the app. Then I try to directly edit the database entry and it says "unauthenticated". I really am doing my best, I wouldn't be asking you for help if I could do it. Anything you need from my end please do let me know. Just help me out here.

[mobizt]

You have to use Service Account credentials that belong to Firebase project to generate the JWT.

The private key was used in JWT signing.

The UID is what you defined in the payload and please make sure that the signing algorithm is RS256 in the header.

Header

FirebaseClient/src/core/JWT.cpp

Line 187 in f700d7e

// {"alg":"RS256","typ":"JWT"}

Payload

FirebaseClient/src/core/JWT.cpp

Line 194 in f700d7e

// {"iss":"<email>","sub":"<email>","aud":"<audience>","iat":<timstamp>,"exp":<expire>,"uid":"<uid>","claims":"<claims>"}

This is the example that allows custom UID authentication, the signed JWT was created internally.

[mobizt]

• The CustomToken class is for ID token authorization using custom token, which the custom claims signed JWT token obtained from the user authentication process in other applications will be used in the authorization requests.