Validating Google sign in ID token in Go

Question

I am finding the way to validate ID token for Google sign-in for Android with a Go backend server project.

What is the equivalent function for validating ID tokens

Answer 1

This is how I've done it using https://github.com/google/google-api-go-client library:

import (
    "google.golang.org/api/oauth2/v2"
    "net/http"
)

var httpClient = &http.Client{}

func verifyIdToken(idToken string) (*oauth2.Tokeninfo, error) {
    oauth2Service, err := oauth2.New(httpClient)
    tokenInfoCall := oauth2Service.Tokeninfo()
    tokenInfoCall.IdToken(idToken)
    tokenInfo, err := tokenInfoCall.Do()
    if err != nil {
        return nil, err
    }
    return tokenInfo, nil
}

oauth2.Tokeninfo object has info about the user. Note that this makes a call to https://www.googleapis.com/oauth2/v2/tokeninfo and I think that all Google API Client Libraries make this http call under the hood.