datastore: try to decode GAE-encoded keys

If a key can't be decoded, try to decode it with the encoding scheme from
google.golang.org/appengine/datastore.

Along with https://github.com/golang/appengine/pull/192, this allows for
cross-compatibility for encoded keys across the two libraries.

Co-authored-by: Luke Mccoy <lukemc@google.com>
Co-authored-by: Chris Broadfoot <cbro@golang.org>

Change-Id: I7e091b37b184a12c30998c3c22baffb964018a61
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/41370
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
Reviewed-by: Steven Buss <sbuss@google.com>
diff --git a/datastore/internal/gaepb/datastore_v3.pb.go b/datastore/internal/gaepb/datastore_v3.pb.go
new file mode 100644
index 0000000..b3c937c
--- /dev/null
+++ b/datastore/internal/gaepb/datastore_v3.pb.go
@@ -0,0 +1,432 @@
+// 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
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package gaepb is a subset of protobufs, copied from google.golang.org/appengine/internal/datastore.
+// It includes the Reference, Path, and Path_Element protos.
+//
+// They are copied here to provide compatibility to decode keys generated by the google.golang.org/appengine/datastore package.
+// Copying the minimal amount of protos to support key decoding means we don't need to add a dependency on the appengine/datastore package.
+package gaepb
+
+import "github.com/golang/protobuf/proto"
+
+type Path struct {
+	Element              []*Path_Element `protobuf:"group,1,rep,name=Element,json=element" json:"element,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
+	XXX_unrecognized     []byte          `json:"-"`
+	XXX_sizecache        int32           `json:"-"`
+}
+
+func (m *Path) Reset()         { *m = Path{} }
+func (m *Path) String() string { return proto.CompactTextString(m) }
+func (*Path) ProtoMessage()    {}
+func (*Path) Descriptor() ([]byte, []int) {
+	return fileDescriptor_datastore_v3_83b17b80c34f6179, []int{3}
+}
+func (m *Path) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Path.Unmarshal(m, b)
+}
+func (m *Path) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Path.Marshal(b, m, deterministic)
+}
+func (dst *Path) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Path.Merge(dst, src)
+}
+func (m *Path) XXX_Size() int {
+	return xxx_messageInfo_Path.Size(m)
+}
+func (m *Path) XXX_DiscardUnknown() {
+	xxx_messageInfo_Path.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Path proto.InternalMessageInfo
+
+func (m *Path) GetElement() []*Path_Element {
+	if m != nil {
+		return m.Element
+	}
+	return nil
+}
+
+type Path_Element struct {
+	Type                 *string  `protobuf:"bytes,2,req,name=type" json:"type,omitempty"`
+	Id                   *int64   `protobuf:"varint,3,opt,name=id" json:"id,omitempty"`
+	Name                 *string  `protobuf:"bytes,4,opt,name=name" json:"name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Path_Element) Reset()         { *m = Path_Element{} }
+func (m *Path_Element) String() string { return proto.CompactTextString(m) }
+func (*Path_Element) ProtoMessage()    {}
+func (*Path_Element) Descriptor() ([]byte, []int) {
+	return fileDescriptor_datastore_v3_83b17b80c34f6179, []int{3, 0}
+}
+func (m *Path_Element) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Path_Element.Unmarshal(m, b)
+}
+func (m *Path_Element) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Path_Element.Marshal(b, m, deterministic)
+}
+func (dst *Path_Element) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Path_Element.Merge(dst, src)
+}
+func (m *Path_Element) XXX_Size() int {
+	return xxx_messageInfo_Path_Element.Size(m)
+}
+func (m *Path_Element) XXX_DiscardUnknown() {
+	xxx_messageInfo_Path_Element.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Path_Element proto.InternalMessageInfo
+
+func (m *Path_Element) GetType() string {
+	if m != nil && m.Type != nil {
+		return *m.Type
+	}
+	return ""
+}
+
+func (m *Path_Element) GetId() int64 {
+	if m != nil && m.Id != nil {
+		return *m.Id
+	}
+	return 0
+}
+
+func (m *Path_Element) GetName() string {
+	if m != nil && m.Name != nil {
+		return *m.Name
+	}
+	return ""
+}
+
+type Reference struct {
+	App                  *string  `protobuf:"bytes,13,req,name=app" json:"app,omitempty"`
+	NameSpace            *string  `protobuf:"bytes,20,opt,name=name_space,json=nameSpace" json:"name_space,omitempty"`
+	Path                 *Path    `protobuf:"bytes,14,req,name=path" json:"path,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Reference) Reset()         { *m = Reference{} }
+func (m *Reference) String() string { return proto.CompactTextString(m) }
+func (*Reference) ProtoMessage()    {}
+func (*Reference) Descriptor() ([]byte, []int) {
+	return fileDescriptor_datastore_v3_83b17b80c34f6179, []int{4}
+}
+func (m *Reference) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Reference.Unmarshal(m, b)
+}
+func (m *Reference) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Reference.Marshal(b, m, deterministic)
+}
+func (dst *Reference) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Reference.Merge(dst, src)
+}
+func (m *Reference) XXX_Size() int {
+	return xxx_messageInfo_Reference.Size(m)
+}
+func (m *Reference) XXX_DiscardUnknown() {
+	xxx_messageInfo_Reference.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Reference proto.InternalMessageInfo
+
+func (m *Reference) GetApp() string {
+	if m != nil && m.App != nil {
+		return *m.App
+	}
+	return ""
+}
+
+func (m *Reference) GetNameSpace() string {
+	if m != nil && m.NameSpace != nil {
+		return *m.NameSpace
+	}
+	return ""
+}
+
+func (m *Reference) GetPath() *Path {
+	if m != nil {
+		return m.Path
+	}
+	return nil
+}
+
+var fileDescriptor_datastore_v3_83b17b80c34f6179 = []byte{
+	// 4156 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xcc, 0x5a, 0xcd, 0x73, 0xe3, 0x46,
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+	0x4b, 0x7f, 0x87, 0x24, 0x1e, 0x50, 0x32, 0x10, 0xeb, 0xd9, 0x19, 0xc7, 0x29, 0x88, 0x5b, 0x3b,
+	0xc7, 0xed, 0x72, 0xb2, 0x88, 0x68, 0x78, 0x85, 0x23, 0xd7, 0x2b, 0x22, 0x4e, 0x06, 0x61, 0xb9,
+	0xe0, 0xc7, 0x40, 0xb2, 0x20, 0xb9, 0x62, 0x09, 0x91, 0x6a, 0x06, 0x29, 0x96, 0xdc, 0x01, 0x18,
+	0xfb, 0xb3, 0x99, 0x1b, 0x8f, 0xfd, 0x28, 0x96, 0x5f, 0xc8, 0xda, 0x39, 0x63, 0x8f, 0x62, 0x6e,
+	0xf1, 0x33, 0x37, 0xe6, 0x8f, 0x34, 0x83, 0x26, 0x3b, 0x70, 0xcf, 0x0e, 0x82, 0xd0, 0x7f, 0xe9,
+	0xce, 0xec, 0x98, 0x59, 0xdc, 0x73, 0xed, 0x63, 0x66, 0x39, 0x6c, 0x1a, 0xdb, 0xd8, 0x13, 0x95,
+	0xe9, 0xdd, 0x0c, 0x60, 0x24, 0xf8, 0x3d, 0xce, 0xe6, 0x71, 0xd7, 0x75, 0xac, 0x88, 0xfd, 0x30,
+	0xe7, 0x1e, 0x60, 0xcd, 0x03, 0xc7, 0xe6, 0x62, 0xd6, 0x45, 0x96, 0x72, 0x9d, 0x91, 0xe4, 0x1c,
+	0x09, 0x46, 0xfb, 0x15, 0xc0, 0xb9, 0x14, 0x64, 0x1b, 0x6e, 0xf3, 0x3a, 0x9e, 0x45, 0x31, 0x73,
+	0x2c, 0xb9, 0xdb, 0x60, 0x1e, 0x47, 0x18, 0xe2, 0xcb, 0x74, 0x23, 0x65, 0xca, 0x9b, 0xc2, 0x79,
+	0x1c, 0x91, 0x9f, 0x40, 0xeb, 0xc2, 0x1c, 0x87, 0x4d, 0x19, 0x7f, 0x6d, 0x15, 0xa7, 0xdd, 0x59,
+	0x98, 0xd6, 0x13, 0x5c, 0xed, 0x4f, 0x14, 0x80, 0x7d, 0x16, 0x53, 0xc1, 0xcd, 0x34, 0xb6, 0x95,
+	0xeb, 0x36, 0xb6, 0xef, 0x27, 0x17, 0x08, 0xc5, 0xab, 0x63, 0xc0, 0x42, 0x97, 0xa1, 0xdc, 0xa4,
+	0xcb, 0xc8, 0x35, 0x11, 0xc5, 0x2b, 0x9a, 0x88, 0x52, 0xae, 0x89, 0xf8, 0x18, 0x9a, 0xf6, 0x74,
+	0xea, 0xbf, 0xe0, 0x05, 0x0d, 0x0b, 0x43, 0xe6, 0xa0, 0x11, 0x9c, 0xd7, 0xdb, 0xc8, 0xec, 0x49,
+	0x9e, 0xf6, 0xe7, 0x0a, 0x34, 0x50, 0x15, 0x51, 0xe0, 0x7b, 0x11, 0x23, 0x5f, 0x42, 0x45, 0x5e,
+	0x44, 0x8b, 0x8b, 0xfc, 0xb7, 0x33, 0xb2, 0x66, 0x70, 0xb2, 0x68, 0xa0, 0x12, 0xcc, 0x33, 0x42,
+	0xe6, 0x75, 0x97, 0x2b, 0x25, 0x45, 0x91, 0xfb, 0x50, 0x73, 0x3d, 0x4b, 0xb4, 0xd4, 0x95, 0x4c,
+	0x58, 0xac, 0xba, 0x1e, 0xd6, 0xb2, 0xed, 0x57, 0x50, 0x11, 0x2f, 0x21, 0x9d, 0x54, 0xa6, 0x8b,
+	0xfa, 0xcb, 0xdc, 0x1c, 0xa7, 0xc2, 0xc8, 0xc3, 0x29, 0xbd, 0x2e, 0x40, 0xb7, 0xa0, 0x7a, 0xca,
+	0x9b, 0x0f, 0xbc, 0xf4, 0xe3, 0xea, 0x4d, 0x86, 0xda, 0x1f, 0x97, 0x00, 0x0e, 0xe7, 0x4b, 0x0c,
+	0xa4, 0x71, 0x5d, 0x03, 0xe9, 0xe4, 0xf4, 0xf8, 0x7a, 0x99, 0x7f, 0x75, 0x43, 0x59, 0xd2, 0x69,
+	0x17, 0x6f, 0xda, 0x69, 0xdf, 0x87, 0x6a, 0x1c, 0xce, 0xb9, 0xa3, 0x08, 0x63, 0x4a, 0x5b, 0x5a,
+	0x49, 0x25, 0x6f, 0x42, 0x79, 0xe2, 0x87, 0x63, 0x86, 0x8e, 0x95, 0xb2, 0x05, 0xed, 0xc2, 0x65,
+	0x52, 0xed, 0xb2, 0xcb, 0x24, 0xde, 0xa0, 0x45, 0xf2, 0x1e, 0x0d, 0x0b, 0x99, 0x7c, 0x83, 0x96,
+	0x5c, 0xb1, 0xd1, 0x14, 0x44, 0xbe, 0x81, 0xa6, 0x3d, 0x8f, 0x7d, 0xcb, 0xe5, 0x15, 0xda, 0xd4,
+	0x1d, 0x9f, 0x61, 0xd9, 0xdd, 0xcc, 0x7f, 0xaf, 0x4f, 0x0f, 0xaa, 0xd3, 0x9d, 0xc7, 0xbe, 0xe1,
+	0x1c, 0x22, 0x72, 0xa7, 0x2a, 0x93, 0x12, 0x5d, 0xb1, 0x33, 0x64, 0xed, 0xc7, 0xb0, 0x92, 0x85,
+	0xf1, 0x04, 0x24, 0x81, 0xea, 0x1b, 0x3c, 0x3b, 0x8d, 0x78, 0x6a, 0x1b, 0x98, 0x46, 0xb7, 0xaf,
+	0x16, 0xb4, 0x18, 0x1a, 0xb8, 0xbc, 0xf4, 0x8e, 0xeb, 0xba, 0xfd, 0x03, 0x28, 0x61, 0xf8, 0x55,
+	0x2e, 0x7c, 0x0f, 0xc1, 0x98, 0x8b, 0xcc, 0xbc, 0xf9, 0x15, 0xb3, 0xe6, 0xf7, 0xdf, 0x05, 0x58,
+	0x31, 0xfd, 0xf9, 0xf8, 0xe4, 0xa2, 0x01, 0xc2, 0xaf, 0x3b, 0x42, 0x2d, 0x31, 0x1f, 0xe5, 0xa6,
+	0xe6, 0x93, 0x5a, 0x47, 0x71, 0x89, 0x75, 0xdc, 0xf4, 0xcc, 0xb5, 0x2f, 0x60, 0x55, 0x6e, 0x5e,
+	0x6a, 0x3d, 0xd1, 0x66, 0xe1, 0x0a, 0x6d, 0x6a, 0xbf, 0x50, 0x60, 0x55, 0xc4, 0xf7, 0xff, 0xbb,
+	0xd2, 0x2a, 0x37, 0x0c, 0xeb, 0xe5, 0x1b, 0x5d, 0x1e, 0xfd, 0xbf, 0xf4, 0x34, 0x6d, 0x08, 0xcd,
+	0x44, 0x7d, 0x37, 0x50, 0xfb, 0x15, 0x46, 0xfc, 0x8b, 0x02, 0x34, 0x06, 0xec, 0xe5, 0x92, 0x20,
+	0x5a, 0xbe, 0xee, 0x71, 0x7c, 0x98, 0x2b, 0x57, 0x1b, 0xdb, 0xeb, 0x59, 0x19, 0xc4, 0xd5, 0x63,
+	0x52, 0xc1, 0xa6, 0xb7, 0xa8, 0xca, 0xf2, 0x5b, 0xd4, 0xd2, 0x62, 0xb7, 0x9e, 0xb9, 0xc5, 0x2b,
+	0x2e, 0xbb, 0xc5, 0xd3, 0xfe, 0xad, 0x08, 0x0d, 0x6c, 0x90, 0x29, 0x8b, 0xe6, 0xd3, 0x38, 0x27,
+	0x4c, 0xe1, 0x6a, 0x61, 0x3a, 0x50, 0x09, 0x71, 0x92, 0x74, 0xa5, 0x4b, 0x83, 0xbf, 0x40, 0x61,
+	0x6b, 0xfc, 0xdc, 0x0d, 0x02, 0xe6, 0x58, 0x82, 0x92, 0x14, 0x30, 0x4d, 0x49, 0x16, 0x22, 0x44,
+	0xbc, 0xfc, 0x9c, 0xf9, 0x21, 0x4b, 0x51, 0x45, 0xbc, 0x4f, 0x68, 0x70, 0x5a, 0x02, 0xc9, 0xdd,
+	0x37, 0x88, 0xca, 0xe0, 0xfc, 0xbe, 0x21, 0xed, 0x35, 0x91, 0x5b, 0x47, 0xae, 0xe8, 0x35, 0x91,
+	0xcd, 0xbb, 0xa8, 0x99, 0x3d, 0x9d, 0x5a, 0x7e, 0x10, 0xa1, 0xd3, 0xd4, 0x68, 0x0d, 0x09, 0xc3,
+	0x20, 0x22, 0x5f, 0x43, 0x7a, 0x5d, 0x2c, 0x6f, 0xc9, 0xc5, 0x39, 0xb6, 0x2e, 0xbb, 0x58, 0xa0,
+	0xab, 0xe3, 0xdc, 0xfd, 0xcf, 0x92, 0x1b, 0xea, 0xca, 0x4d, 0x6f, 0xa8, 0x1f, 0x42, 0x59, 0xc4,
+	0xa8, 0xda, 0xeb, 0x62, 0x94, 0xc0, 0x65, 0xed, 0xb3, 0x91, 0xb7, 0xcf, 0x5f, 0x16, 0x80, 0x74,
+	0xa7, 0x53, 0x7f, 0x6c, 0xc7, 0xcc, 0x70, 0xa2, 0x8b, 0x66, 0x7a, 0xed, 0xcf, 0x2e, 0x9f, 0x41,
+	0x7d, 0xe6, 0x3b, 0x6c, 0x6a, 0x25, 0xdf, 0x94, 0x2e, 0xad, 0x7e, 0x10, 0xc6, 0x5b, 0x52, 0x02,
+	0x25, 0xbc, 0xc4, 0x51, 0xb0, 0xee, 0xc0, 0x67, 0xde, 0x84, 0xcd, 0xec, 0x97, 0xb2, 0x14, 0xe1,
+	0x8f, 0xa4, 0x03, 0xd5, 0x90, 0x45, 0x2c, 0x3c, 0x65, 0x57, 0x16, 0x55, 0x09, 0x48, 0x7b, 0x06,
+	0x1b, 0xb9, 0x1d, 0x49, 0x47, 0xbe, 0x85, 0x5f, 0x2b, 0xc3, 0x58, 0x7e, 0xb4, 0x12, 0x03, 0xfe,
+	0x3a, 0xe6, 0x25, 0x9f, 0x41, 0xf9, 0x63, 0xea, 0xf0, 0xc5, 0xab, 0xe2, 0xec, 0x1e, 0xa8, 0x59,
+	0x4d, 0xbb, 0x63, 0x0c, 0x36, 0xf2, 0x54, 0x0a, 0xd7, 0x3b, 0x15, 0xed, 0xef, 0x0a, 0xb0, 0xde,
+	0x75, 0x1c, 0xf1, 0x77, 0xc3, 0x25, 0xaa, 0x2f, 0x5e, 0x57, 0xf5, 0x0b, 0x81, 0x58, 0x84, 0x89,
+	0x6b, 0x05, 0xe2, 0x0f, 0xa1, 0x92, 0xd6, 0x5a, 0xc5, 0x05, 0x77, 0x16, 0x72, 0x51, 0x09, 0xd0,
+	0x6e, 0x01, 0xc9, 0x0a, 0x2b, 0xb4, 0xaa, 0xfd, 0x69, 0x11, 0xee, 0xee, 0xb2, 0x63, 0xd7, 0xcb,
+	0xbe, 0xe2, 0x57, 0xdf, 0xc9, 0xc5, 0x4f, 0x65, 0x9f, 0xc1, 0xba, 0x28, 0xe4, 0x93, 0x7f, 0x62,
+	0x59, 0xec, 0x58, 0x7e, 0x9d, 0x94, 0xb1, 0x6a, 0x0d, 0xf9, 0x07, 0x92, 0xad, 0xe3, 0x7f, 0xc5,
+	0x1c, 0x3b, 0xb6, 0x9f, 0xd9, 0x11, 0xb3, 0x5c, 0x47, 0xfe, 0x59, 0x06, 0x12, 0x92, 0xe1, 0x90,
+	0x21, 0x94, 0xb8, 0x0d, 0xa2, 0xeb, 0x36, 0xb7, 0xb7, 0x33, 0x62, 0x5d, 0xb2, 0x95, 0xac, 0x02,
+	0x0f, 0x7c, 0x87, 0xed, 0x54, 0x8f, 0x06, 0x4f, 0x06, 0xc3, 0xef, 0x06, 0x14, 0x17, 0x22, 0x06,
+	0xdc, 0x0a, 0x42, 0x76, 0xea, 0xfa, 0xf3, 0xc8, 0xca, 0x9e, 0x44, 0xf5, 0xca, 0x94, 0xb8, 0x91,
+	0xcc, 0xc9, 0x10, 0xb5, 0x9f, 0xc2, 0xda, 0xc2, 0xcb, 0x78, 0x6d, 0x26, 0x5f, 0xa7, 0xbe, 0x41,
+	0x56, 0xa1, 0x8e, 0x1f, 0xbb, 0x97, 0x7f, 0xfb, 0xd6, 0xfe, 0xb5, 0x80, 0x57, 0x4c, 0x33, 0x37,
+	0xbe, 0x59, 0x06, 0xfb, 0xcd, 0x7c, 0x06, 0x83, 0xed, 0x77, 0xf3, 0xe6, 0x9b, 0x59, 0xb0, 0xf3,
+	0xad, 0x00, 0xa6, 0x41, 0xa4, 0x6d, 0x43, 0x55, 0xd2, 0xc8, 0x6f, 0xc1, 0x5a, 0xe8, 0xfb, 0x71,
+	0xd2, 0x89, 0x8a, 0x0e, 0xe4, 0xf2, 0x3f, 0xdb, 0xac, 0x72, 0xb0, 0x48, 0x06, 0x4f, 0xf2, 0xbd,
+	0x48, 0x59, 0xfc, 0x0d, 0x44, 0x0e, 0x77, 0x1b, 0xbf, 0x5b, 0x4f, 0xff, 0xb7, 0xfb, 0xbf, 0x01,
+	0x00, 0x00, 0xff, 0xff, 0x35, 0x9f, 0x30, 0x98, 0xf2, 0x2b, 0x00, 0x00,
+}
diff --git a/datastore/key.go b/datastore/key.go
index 778fa26..a25edc8 100644
--- a/datastore/key.go
+++ b/datastore/key.go
@@ -209,6 +209,19 @@
 
 // DecodeKey decodes a key from the opaque representation returned by Encode.
 func DecodeKey(encoded string) (*Key, error) {
+	k, err := decodeCloudKey(encoded)
+	if err != nil {
+		// Couldn't decode it as a Cloud Datastore key, try decoding it as a key encoded by google.golang.org/appengine/datastore.
+		if k := decodeGAEKey(encoded); k != nil {
+			return k, nil
+		}
+		// Return original error.
+		return nil, err
+	}
+	return k, nil
+}
+
+func decodeCloudKey(encoded string) (*Key, error) {
 	// Re-add padding.
 	if m := len(encoded) % 4; m != 0 {
 		encoded += strings.Repeat("=", 4-m)
diff --git a/datastore/keycompat.go b/datastore/keycompat.go
new file mode 100644
index 0000000..0464fe7
--- /dev/null
+++ b/datastore/keycompat.go
@@ -0,0 +1,66 @@
+// 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
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package datastore
+
+import (
+	"encoding/base64"
+	"strings"
+
+	"cloud.google.com/go/datastore/internal/gaepb"
+	"github.com/golang/protobuf/proto"
+)
+
+// decodeGAEKey attempts to decode the given encoded key generated by the
+// GAE Datastore package (google.golang.org/appengine/datastore), 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
+}
diff --git a/datastore/keycompat_test.go b/datastore/keycompat_test.go
new file mode 100644
index 0000000..6897c5a
--- /dev/null
+++ b/datastore/keycompat_test.go
@@ -0,0 +1,55 @@
+// 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
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package datastore
+
+import (
+	"testing"
+)
+
+func TestKeyConversion(t *testing.T) {
+	tests := []struct {
+		desc string
+
+		gaeKey      string
+		wantEncoded string
+		wantName    string
+	}{
+		{
+			desc:        "A GAE key with a Name ID.", // Generated by: https://play.golang.org/p/00fNVEKSmBX
+			gaeKey:      "agdmb28tYXBwchwLEgh0ZXN0S2luZCIOZm9vYmFyc3RyaW5naWQM",
+			wantEncoded: "EhoKCHRlc3RLaW5kGg5mb29iYXJzdHJpbmdpZA",
+			wantName:    "foobarstringid",
+		},
+		{
+			desc:        "Another GAE key with a Name ID",
+			gaeKey:      "ag1wfnBlbmRvLWV4YW1wcjkLEg90ZXN0U3RyaW5nS2V5czIiJDdlNDA2YTNkLTUyNTItMTFlOS05MTMyLTdmNjUyMzg3YThlYgw",
+			wantEncoded: "EjcKD3Rlc3RTdHJpbmdLZXlzMhokN2U0MDZhM2QtNTI1Mi0xMWU5LTkxMzItN2Y2NTIzODdhOGVi",
+			wantName:    "7e406a3d-5252-11e9-9132-7f652387a8eb",
+		},
+	}
+
+	for _, tc := range tests {
+		k, err := DecodeKey(tc.gaeKey)
+		if err != nil {
+			t.Fatalf("DecodeKey(%s): %v", tc.desc, err)
+		}
+		if k.Name != tc.wantName {
+			t.Errorf("Name(%s): got %+v, want %+v", tc.desc, k.Name, tc.wantName)
+		}
+		if enc := k.Encode(); enc != tc.wantEncoded {
+			t.Errorf("Encode(%s): got %+v, want %+v", tc.desc, enc, tc.wantEncoded)
+		}
+	}
+}