Connect to the Firebase Realtime Database in Golang using the Google API *http.Client

main.go

package main

import (
	"context"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"golang.org/x/oauth2/google"
)

func main() {
	path := "https://[Your Namespace].firebaseio.com/restricted.json"
	err := os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "creds.json")

	hc, err := google.DefaultClient(context.Background(),
		"https://www.googleapis.com/auth/firebase.database",
		"https://www.googleapis.com/auth/userinfo.email",
	)
	if err != nil {
		log.Fatalln(err)
	}

	req, err := http.NewRequest("GET", path, nil)
	if err != nil {
		log.Fatalln(err)
	}

	res, err := hc.Do(req)
	if err != nil {
		log.Fatalln(err)
	}
	defer res.Body.Close()

	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		log.Fatalln(err)
	}

	fmt.Printf("%s", body)
}