Add User service.

impl/prod/user.go

Index: impl/prod/user.go
diff --git a/impl/prod/user.go b/impl/prod/user.go
new file mode 100644
index 0000000000000000000000000000000000000000..7d8ad2a098ed68f8373e10af706326c675a8cd57
--- /dev/null
+++ b/impl/prod/user.go
@@ -0,0 +1,55 @@
+// Copyright 2015 The Chromium 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 prod
+
+import (
+	gae_user "github.com/luci/gae/service/user"
+	"golang.org/x/net/context"
+	"google.golang.org/appengine/user"
+)
+
+// useUser adds a user service implementation to context, accessible
+// by "github.com/luci/gae/service/user".Get(c)
+func useUser(c context.Context) context.Context {
+	return gae_user.SetFactory(c, func(ci context.Context) gae_user.Interface {
+		return userImpl{AEContext(ci)}
+	})
+}
+
+type userImpl struct {
+	aeCtx context.Context
+}
+
+func (u userImpl) IsAdmin() bool {
+	return user.IsAdmin(u.aeCtx)
+}
+
+func (u userImpl) LoginURL(dest string) (string, error) {
+	return user.LoginURL(u.aeCtx, dest)
+}
+
+func (u userImpl) LoginURLFederated(dest, identity string) (string, error) {
+	return user.LoginURLFederated(u.aeCtx, dest, identity)
+}
+
+func (u userImpl) LogoutURL(dest string) (string, error) {
+	return user.LogoutURL(u.aeCtx, dest)
+}
+
+func (u userImpl) Current() *gae_user.User {
+	return (*gae_user.User)(user.Current(u.aeCtx))
+}
+
+func (u userImpl) CurrentOAuth() (*gae_user.User, error) {
+	usr, err := user.CurrentOAuth(u.aeCtx)
+	if err != nil {
+		return nil, err
+	}
+	return (*gae_user.User)(usr), nil
+}
+
+func (u userImpl) OAuthConsumerKey() (string, error) {
+	return user.OAuthConsumerKey(u.aeCtx)
+}