package main

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path"

	"firebase.google.com/go"
	"google.golang.org/api/option"
)

func main() {
	app, err := firebase.NewApp(context.Background(), &firebase.Config{
		ProjectID: "<PROJECT_ID>",
	}, option.WithCredentialsFile("<CREDENTIAL_FILE_PATH>"))
	if err != nil {
		panic(err)
	}

	cli, err := app.Auth(context.Background())
	if err != nil {
		panic(err)
	}

	rec, err := cli.GetUser(context.Background(), "<UID>")
	if err != nil {
		panic(err)
	}

	recJSON, err := json.MarshalIndent(rec, "", "  ")
	if err != nil {
		panic(err)
	}

	fmt.Printf("%s\n", recJSON)

	if err := cli.SetCustomUserClaims(context.Background(), "<UID>", map[string]interface{}{
		"this is sample": "hogehoge fugafuga",
	}); err != nil {
		panic(err)
	}
}