Skip to content
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
67 lines (60 sloc) 1.84 KB
// Copyright 2019 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package datastore
import (
// decodeGAEKey attempts to decode the given encoded key generated by the
// GAE Datastore package (, returning nil
// if the key couldn't be decoded.
func decodeGAEKey(encoded string) *Key {
// Re-add padding.
if m := len(encoded) % 4; m != 0 {
encoded += strings.Repeat("=", 4-m)
b, err := base64.URLEncoding.DecodeString(encoded)
if err != nil {
return nil
ref := new(gaepb.Reference)
if err := proto.Unmarshal(b, ref); err != nil {
return nil
return gaeProtoToKey(ref)
// gaeProtoToKey accepts a GAE Datastore key and converts it to a Cloud Datastore key.
// This is adapted from the "protoToKey" function in the appengine/datastore package.
// NOTE(cbro): this is a lossy operation, as GAE Datastore keys include the project/app ID,
// but Cloud Datastore keys do not.
func gaeProtoToKey(r *gaepb.Reference) *Key {
namespace := r.GetNameSpace()
var k *Key
for _, e := range r.Path.Element {
k = &Key{
Kind: e.GetType(),
Name: e.GetName(),
ID: e.GetId(),
Parent: k,
Namespace: namespace,
if !k.valid() {
return nil
return k
You can’t perform that action at this time.