1// Copyright 2012 Google Inc. All rights reserved.
2// Use of this source code is governed by the Apache 2.0
3// license that can be found in the LICENSE file.
4
5package appengine
6
7import (
8	"fmt"
9	"regexp"
10
11	"golang.org/x/net/context"
12
13	"google.golang.org/appengine/internal"
14)
15
16// Namespace returns a replacement context that operates within the given namespace.
17func Namespace(c context.Context, namespace string) (context.Context, error) {
18	if !validNamespace.MatchString(namespace) {
19		return nil, fmt.Errorf("appengine: namespace %q does not match /%s/", namespace, validNamespace)
20	}
21	return internal.NamespacedContext(c, namespace), nil
22}
23
24// validNamespace matches valid namespace names.
25var validNamespace = regexp.MustCompile(`^[0-9A-Za-z._-]{0,100}$`)
26