Add OAuth2 authentication

vendor/google.golang.org/appengine/user/user_classic.go

@@ -0,0 +1,35 @@
+// Copyright 2015 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+// +build appengine
+
+package user
+
+import (
+	"appengine/user"
+
+	"golang.org/x/net/context"
+
+	"google.golang.org/appengine/internal"
+)
+
+func Current(ctx context.Context) *User {
+	u := user.Current(internal.ClassicContextFromContext(ctx))
+	if u == nil {
+		return nil
+	}
+	// Map appengine/user.User to this package's User type.
+	return &User{
+		Email:             u.Email,
+		AuthDomain:        u.AuthDomain,
+		Admin:             u.Admin,
+		ID:                u.ID,
+		FederatedIdentity: u.FederatedIdentity,
+		FederatedProvider: u.FederatedProvider,
+	}
+}
+
+func IsAdmin(ctx context.Context) bool {
+	return user.IsAdmin(internal.ClassicContextFromContext(ctx))
+}