1// Copyright 2014 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package google 6 7import ( 8 "context" 9 "time" 10 11 "golang.org/x/oauth2" 12) 13 14// Set at init time by appengine_gen1.go. If nil, we're not on App Engine standard first generation (<= Go 1.9) or App Engine flexible. 15var appengineTokenFunc func(c context.Context, scopes ...string) (token string, expiry time.Time, err error) 16 17// Set at init time by appengine_gen1.go. If nil, we're not on App Engine standard first generation (<= Go 1.9) or App Engine flexible. 18var appengineAppIDFunc func(c context.Context) string 19 20// AppEngineTokenSource returns a token source that fetches tokens from either 21// the current application's service account or from the metadata server, 22// depending on the App Engine environment. See below for environment-specific 23// details. If you are implementing a 3-legged OAuth 2.0 flow on App Engine that 24// involves user accounts, see oauth2.Config instead. 25// 26// First generation App Engine runtimes (<= Go 1.9): 27// AppEngineTokenSource returns a token source that fetches tokens issued to the 28// current App Engine application's service account. The provided context must have 29// come from appengine.NewContext. 30// 31// Second generation App Engine runtimes (>= Go 1.11) and App Engine flexible: 32// AppEngineTokenSource is DEPRECATED on second generation runtimes and on the 33// flexible environment. It delegates to ComputeTokenSource, and the provided 34// context and scopes are not used. Please use DefaultTokenSource (or ComputeTokenSource, 35// which DefaultTokenSource will use in this case) instead. 36func AppEngineTokenSource(ctx context.Context, scope ...string) oauth2.TokenSource { 37 return appEngineTokenSource(ctx, scope...) 38} 39