1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Package jsonpb provides functionality to marshal and unmarshal between a
6// protocol buffer message and JSON. It follows the specification at
7// https://developers.google.com/protocol-buffers/docs/proto3#json.
8//
9// Do not rely on the default behavior of the standard encoding/json package
10// when called on generated message types as it does not operate correctly.
11//
12// Deprecated: Use the "google.golang.org/protobuf/encoding/protojson"
13// package instead.
14package jsonpb
15
16import (
17	"github.com/golang/protobuf/proto"
18	"google.golang.org/protobuf/reflect/protoreflect"
19	"google.golang.org/protobuf/reflect/protoregistry"
20	"google.golang.org/protobuf/runtime/protoimpl"
21)
22
23// AnyResolver takes a type URL, present in an Any message,
24// and resolves it into an instance of the associated message.
25type AnyResolver interface {
26	Resolve(typeURL string) (proto.Message, error)
27}
28
29type anyResolver struct{ AnyResolver }
30
31func (r anyResolver) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
32	return r.FindMessageByURL(string(message))
33}
34
35func (r anyResolver) FindMessageByURL(url string) (protoreflect.MessageType, error) {
36	m, err := r.Resolve(url)
37	if err != nil {
38		return nil, err
39	}
40	return protoimpl.X.MessageTypeOf(m), nil
41}
42
43func (r anyResolver) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
44	return protoregistry.GlobalTypes.FindExtensionByName(field)
45}
46
47func (r anyResolver) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
48	return protoregistry.GlobalTypes.FindExtensionByNumber(message, field)
49}
50
51func wellKnownType(s protoreflect.FullName) string {
52	if s.Parent() == "google.protobuf" {
53		switch s.Name() {
54		case "Empty", "Any",
55			"BoolValue", "BytesValue", "StringValue",
56			"Int32Value", "UInt32Value", "FloatValue",
57			"Int64Value", "UInt64Value", "DoubleValue",
58			"Duration", "Timestamp",
59			"NullValue", "Struct", "Value", "ListValue":
60			return string(s.Name())
61		}
62	}
63	return ""
64}
65
66func isMessageSet(md protoreflect.MessageDescriptor) bool {
67	ms, ok := md.(interface{ IsMessageSet() bool })
68	return ok && ms.IsMessageSet()
69}
70