| // Copyright 2014 The oauth2 Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build appengine,!appenginevm |
| |
| // App Engine hooks. |
| |
| package oauth2 |
| |
| import ( |
| "log" |
| "net/http" |
| "sync" |
| |
| "appengine" |
| "appengine/urlfetch" |
| ) |
| |
| var warnOnce sync.Once |
| |
| func init() { |
| registerContextClientFunc(contextClientAppEngine) |
| } |
| |
| func contextClientAppEngine(ctx Context) (*http.Client, error) { |
| if actx, ok := ctx.(appengine.Context); ok { |
| return urlfetch.Client(actx), nil |
| } |
| // The user did it wrong. We'll log once (and hope they see it |
| // in dev_appserver), but stil return (nil, nil) in case some |
| // other contextClientFunc hook finds a way to proceed. |
| warnOnce.Do(gaeDoingItWrongHelp) |
| return nil, nil |
| } |
| |
| func gaeDoingItWrongHelp() { |
| log.Printf("WARNING: you attempted to use the oauth2 package without passing a valid appengine.Context or *http.Request as the oauth2.Context. App Engine requires that all service RPCs (including urlfetch) be associated with an *http.Request/appengine.Context.") |
| } |