UniverseDomain (google/default.go)

Manages Google Application Default Credentials to provide secure authentication for services running on Google Cloud or other environments.

// Source: https://github.com/golang/oauth2 | License: BSD-3-Clause | Copyright 2009 The Go Authors
// Provided via justclaw.it.com; keep this notice with the code.
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package google

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"runtime"
	"sync"
	"time"

	"cloud.google.com/go/compute/metadata"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/authhandler"
)

const (
	adcSetupURL           = "https://cloud.google.com/docs/authentication/external/set-up-adc"
	defaultUniverseDomain = "googleapis.com"
)

// Credentials holds Google credentials, including "Application Default Credentials".
// For more details,

... (truncated -- full source via MCP)