encoding/jsonpb: add support for marshaling well-known types

Also, changed MarshalOptions.Compact to Indent for consistency with v1
and to make compact as the default.

Change-Id: Id08aaa5ca5656f18e7925d2eabc0b6b055b1cebb
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/168352
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/encoding/jsonpb/encode.go b/encoding/jsonpb/encode.go
index 3830f31..a9ca581 100644
--- a/encoding/jsonpb/encode.go
+++ b/encoding/jsonpb/encode.go
@@ -6,6 +6,7 @@
 
 import (
 	"encoding/base64"
+	"fmt"
 	"sort"
 
 	"github.com/golang/protobuf/v2/internal/encoding/json"
@@ -13,6 +14,7 @@
 	"github.com/golang/protobuf/v2/internal/pragma"
 	"github.com/golang/protobuf/v2/proto"
 	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
+	"github.com/golang/protobuf/v2/reflect/protoregistry"
 
 	descpb "github.com/golang/protobuf/v2/types/descriptor"
 )
@@ -26,18 +28,21 @@
 type MarshalOptions struct {
 	pragma.NoUnkeyedLiterals
 
-	// Set Compact to true to have output in a single line with no line breaks.
-	Compact bool
+	// If Indent is a non-empty string, it causes entries for an Array or Object
+	// to be preceded by the indent and trailed by a newline. Indent can only be
+	// composed of space or tab characters.
+	Indent string
+
+	// Resolver is the registry used for type lookups when marshaling
+	// google.protobuf.Any messages. If Resolver is not set, marshaling will
+	// default to using protoregistry.GlobalTypes.
+	Resolver *protoregistry.Types
 }
 
-// Marshal returns the given proto.Message in JSON format using options in MarshalOptions object.
+// Marshal marshals the given proto.Message in the JSON format using options in
+// MarshalOptions.
 func (o MarshalOptions) Marshal(m proto.Message) ([]byte, error) {
-	indent := "  "
-	if o.Compact {
-		indent = ""
-	}
-
-	enc, err := newEncoder(indent)
+	enc, err := newEncoder(o.Indent, o.Resolver)
 	if err != nil {
 		return nil, err
 	}
@@ -53,21 +58,42 @@
 // encoder encodes protoreflect values into JSON.
 type encoder struct {
 	*json.Encoder
+	resolver *protoregistry.Types
 }
 
-func newEncoder(indent string) (encoder, error) {
+func newEncoder(indent string, resolver *protoregistry.Types) (encoder, error) {
 	enc, err := json.NewEncoder(indent)
 	if err != nil {
-		return encoder{}, errors.New("error in constructing an encoder: %v", err)
+		return encoder{}, err
 	}
-	return encoder{enc}, nil
+	if resolver == nil {
+		resolver = protoregistry.GlobalTypes
+	}
+	return encoder{
+		Encoder:  enc,
+		resolver: resolver,
+	}, nil
 }
 
 // marshalMessage marshals the given protoreflect.Message.
 func (e encoder) marshalMessage(m pref.Message) error {
+	var nerr errors.NonFatal
+
+	if isCustomType(m.Type().FullName()) {
+		return e.marshalCustomType(m)
+	}
+
 	e.StartObject()
 	defer e.EndObject()
+	if err := e.marshalFields(m); !nerr.Merge(err) {
+		return err
+	}
 
+	return nerr.E
+}
+
+// marshalFields marshals the fields in the given protoreflect.Message.
+func (e encoder) marshalFields(m pref.Message) error {
 	var nerr errors.NonFatal
 	fieldDescs := m.Type().Fields()
 	knownFields := m.KnownFields()
@@ -85,12 +111,17 @@
 			continue
 		}
 
+		// An empty google.protobuf.Value should NOT be marshaled out.
+		// Hence need to check ahead for this.
+		val := knownFields.Get(num)
+		if isEmptyKnownValue(val, fd.MessageType()) {
+			continue
+		}
+
 		name := fd.JSONName()
 		if err := e.WriteName(name); !nerr.Merge(err) {
 			return err
 		}
-
-		val := knownFields.Get(num)
 		if err := e.marshalValue(val, fd); !nerr.Merge(err) {
 			return err
 		}
@@ -165,8 +196,12 @@
 		}
 
 	case pref.EnumKind:
+		enumType := fd.EnumType()
 		num := val.Enum()
-		if desc := fd.EnumType().Values().ByNumber(num); desc != nil {
+
+		if enumType.FullName() == "google.protobuf.NullValue" {
+			e.WriteNull()
+		} else if desc := enumType.Values().ByNumber(num); desc != nil {
 			err := e.WriteString(string(desc.Name()))
 			if !nerr.Merge(err) {
 				return err
@@ -182,7 +217,7 @@
 		}
 
 	default:
-		return errors.New("%v has unknown kind: %v", fd.FullName(), kind)
+		panic(fmt.Sprintf("%v has unknown kind: %v", fd.FullName(), kind))
 	}
 	return nerr.E
 }
diff --git a/encoding/jsonpb/encode_test.go b/encoding/jsonpb/encode_test.go
index 280e8db..13596e0 100644
--- a/encoding/jsonpb/encode_test.go
+++ b/encoding/jsonpb/encode_test.go
@@ -5,6 +5,7 @@
 package jsonpb_test
 
 import (
+	"encoding/hex"
 	"math"
 	"strings"
 	"testing"
@@ -15,6 +16,7 @@
 	"github.com/golang/protobuf/v2/internal/encoding/wire"
 	"github.com/golang/protobuf/v2/internal/scalar"
 	"github.com/golang/protobuf/v2/proto"
+	preg "github.com/golang/protobuf/v2/reflect/protoregistry"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 
@@ -23,6 +25,7 @@
 
 	"github.com/golang/protobuf/v2/encoding/testprotos/pb2"
 	"github.com/golang/protobuf/v2/encoding/testprotos/pb3"
+	knownpb "github.com/golang/protobuf/v2/types/known"
 )
 
 // splitLines is a cmpopts.Option for comparing strings with line breaks.
@@ -53,12 +56,22 @@
 	knownFields.Set(wire.Number(xd.Field), pval)
 }
 
+// dhex decodes a hex-string and returns the bytes and panics if s is invalid.
+func dhex(s string) []byte {
+	b, err := hex.DecodeString(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
 func TestMarshal(t *testing.T) {
 	tests := []struct {
-		desc  string
-		mo    jsonpb.MarshalOptions
-		input proto.Message
-		want  string
+		desc    string
+		mo      jsonpb.MarshalOptions
+		input   proto.Message
+		want    string
+		wantErr bool // TODO: Verify error message substring.
 	}{{
 		desc:  "proto2 optional scalars not set",
 		input: &pb2.Scalars{},
@@ -136,6 +149,21 @@
   "optString": "谷歌"
 }`,
 	}, {
+		desc: "string",
+		input: &pb3.Scalars{
+			SString: "谷歌",
+		},
+		want: `{
+  "sString": "谷歌"
+}`,
+	}, {
+		desc: "string with invalid UTF8",
+		input: &pb3.Scalars{
+			SString: "abc\xff",
+		},
+		want:    "{\n  \"sString\": \"abc\xff\"\n}",
+		wantErr: true,
+	}, {
 		desc: "float nan",
 		input: &pb3.Scalars{
 			SFloat: float32(math.NaN()),
@@ -915,15 +943,754 @@
     "optString": "another not a messageset extension"
   }
 }`,
+	}, {
+		desc:  "BoolValue empty",
+		input: &knownpb.BoolValue{},
+		want:  `false`,
+	}, {
+		desc:  "BoolValue",
+		input: &knownpb.BoolValue{Value: true},
+		want:  `true`,
+	}, {
+		desc:  "Int32Value empty",
+		input: &knownpb.Int32Value{},
+		want:  `0`,
+	}, {
+		desc:  "Int32Value",
+		input: &knownpb.Int32Value{Value: 42},
+		want:  `42`,
+	}, {
+		desc:  "Int64Value",
+		input: &knownpb.Int64Value{Value: 42},
+		want:  `"42"`,
+	}, {
+		desc:  "UInt32Value",
+		input: &knownpb.UInt32Value{Value: 42},
+		want:  `42`,
+	}, {
+		desc:  "UInt64Value",
+		input: &knownpb.UInt64Value{Value: 42},
+		want:  `"42"`,
+	}, {
+		desc:  "FloatValue",
+		input: &knownpb.FloatValue{Value: 1.02},
+		want:  `1.02`,
+	}, {
+		desc:  "DoubleValue",
+		input: &knownpb.DoubleValue{Value: 1.02},
+		want:  `1.02`,
+	}, {
+		desc:  "StringValue empty",
+		input: &knownpb.StringValue{},
+		want:  `""`,
+	}, {
+		desc:  "StringValue",
+		input: &knownpb.StringValue{Value: "谷歌"},
+		want:  `"谷歌"`,
+	}, {
+		desc:    "StringValue with invalid UTF8 error",
+		input:   &knownpb.StringValue{Value: "abc\xff"},
+		want:    "\"abc\xff\"",
+		wantErr: true,
+	}, {
+		desc: "StringValue field with invalid UTF8 error",
+		input: &pb2.KnownTypes{
+			OptString: &knownpb.StringValue{Value: "abc\xff"},
+		},
+		want:    "{\n  \"optString\": \"abc\xff\"\n}",
+		wantErr: true,
+	}, {
+		desc:  "BytesValue",
+		input: &knownpb.BytesValue{Value: []byte("hello")},
+		want:  `"aGVsbG8="`,
+	}, {
+		desc:  "Empty",
+		input: &knownpb.Empty{},
+		want:  `{}`,
+	}, {
+		desc:  "Value empty",
+		input: &knownpb.Value{},
+		want:  ``,
+	}, {
+		desc: "Value empty field",
+		input: &pb2.KnownTypes{
+			OptValue: &knownpb.Value{},
+		},
+		want: `{}`,
+	}, {
+		desc:  "Value contains NullValue",
+		input: &knownpb.Value{Kind: &knownpb.Value_NullValue{}},
+		want:  `null`,
+	}, {
+		desc:  "Value contains BoolValue",
+		input: &knownpb.Value{Kind: &knownpb.Value_BoolValue{}},
+		want:  `false`,
+	}, {
+		desc:  "Value contains NumberValue",
+		input: &knownpb.Value{Kind: &knownpb.Value_NumberValue{1.02}},
+		want:  `1.02`,
+	}, {
+		desc:  "Value contains StringValue",
+		input: &knownpb.Value{Kind: &knownpb.Value_StringValue{"hello"}},
+		want:  `"hello"`,
+	}, {
+		desc:    "Value contains StringValue with invalid UTF8",
+		input:   &knownpb.Value{Kind: &knownpb.Value_StringValue{"\xff"}},
+		want:    "\"\xff\"",
+		wantErr: true,
+	}, {
+		desc: "Value contains Struct",
+		input: &knownpb.Value{
+			Kind: &knownpb.Value_StructValue{
+				&knownpb.Struct{
+					Fields: map[string]*knownpb.Value{
+						"null":   {Kind: &knownpb.Value_NullValue{}},
+						"number": {Kind: &knownpb.Value_NumberValue{}},
+						"string": {Kind: &knownpb.Value_StringValue{}},
+						"struct": {Kind: &knownpb.Value_StructValue{}},
+						"list":   {Kind: &knownpb.Value_ListValue{}},
+						"bool":   {Kind: &knownpb.Value_BoolValue{}},
+					},
+				},
+			},
+		},
+		want: `{
+  "bool": false,
+  "list": [],
+  "null": null,
+  "number": 0,
+  "string": "",
+  "struct": {}
+}`,
+	}, {
+		desc: "Value contains ListValue",
+		input: &knownpb.Value{
+			Kind: &knownpb.Value_ListValue{
+				&knownpb.ListValue{
+					Values: []*knownpb.Value{
+						{Kind: &knownpb.Value_BoolValue{}},
+						{Kind: &knownpb.Value_NullValue{}},
+						{Kind: &knownpb.Value_NumberValue{}},
+						{Kind: &knownpb.Value_StringValue{}},
+						{Kind: &knownpb.Value_StructValue{}},
+						{Kind: &knownpb.Value_ListValue{}},
+					},
+				},
+			},
+		},
+		want: `[
+  false,
+  null,
+  0,
+  "",
+  {},
+  []
+]`,
+	}, {
+		desc:  "Struct with nil map",
+		input: &knownpb.Struct{},
+		want:  `{}`,
+	}, {
+		desc: "Struct with empty map",
+		input: &knownpb.Struct{
+			Fields: map[string]*knownpb.Value{},
+		},
+		want: `{}`,
+	}, {
+		desc: "Struct",
+		input: &knownpb.Struct{
+			Fields: map[string]*knownpb.Value{
+				"bool":   {Kind: &knownpb.Value_BoolValue{true}},
+				"null":   {Kind: &knownpb.Value_NullValue{}},
+				"number": {Kind: &knownpb.Value_NumberValue{3.1415}},
+				"string": {Kind: &knownpb.Value_StringValue{"hello"}},
+				"struct": {
+					Kind: &knownpb.Value_StructValue{
+						&knownpb.Struct{
+							Fields: map[string]*knownpb.Value{
+								"string": {Kind: &knownpb.Value_StringValue{"world"}},
+							},
+						},
+					},
+				},
+				"list": {
+					Kind: &knownpb.Value_ListValue{
+						&knownpb.ListValue{
+							Values: []*knownpb.Value{
+								{Kind: &knownpb.Value_BoolValue{}},
+								{Kind: &knownpb.Value_NullValue{}},
+								{Kind: &knownpb.Value_NumberValue{}},
+							},
+						},
+					},
+				},
+			},
+		},
+		want: `{
+  "bool": true,
+  "list": [
+    false,
+    null,
+    0
+  ],
+  "null": null,
+  "number": 3.1415,
+  "string": "hello",
+  "struct": {
+    "string": "world"
+  }
+}`,
+	}, {
+		desc: "Struct message with invalid UTF8 string",
+		input: &knownpb.Struct{
+			Fields: map[string]*knownpb.Value{
+				"string": {Kind: &knownpb.Value_StringValue{"\xff"}},
+			},
+		},
+		want:    "{\n  \"string\": \"\xff\"\n}",
+		wantErr: true,
+	}, {
+		desc:  "ListValue with nil values",
+		input: &knownpb.ListValue{},
+		want:  `[]`,
+	}, {
+		desc: "ListValue with empty values",
+		input: &knownpb.ListValue{
+			Values: []*knownpb.Value{},
+		},
+		want: `[]`,
+	}, {
+		desc: "ListValue",
+		input: &knownpb.ListValue{
+			Values: []*knownpb.Value{
+				{Kind: &knownpb.Value_BoolValue{true}},
+				{Kind: &knownpb.Value_NullValue{}},
+				{Kind: &knownpb.Value_NumberValue{3.1415}},
+				{Kind: &knownpb.Value_StringValue{"hello"}},
+				{
+					Kind: &knownpb.Value_ListValue{
+						&knownpb.ListValue{
+							Values: []*knownpb.Value{
+								{Kind: &knownpb.Value_BoolValue{}},
+								{Kind: &knownpb.Value_NullValue{}},
+								{Kind: &knownpb.Value_NumberValue{}},
+							},
+						},
+					},
+				},
+				{
+					Kind: &knownpb.Value_StructValue{
+						&knownpb.Struct{
+							Fields: map[string]*knownpb.Value{
+								"string": {Kind: &knownpb.Value_StringValue{"world"}},
+							},
+						},
+					},
+				},
+			},
+		},
+		want: `[
+  true,
+  null,
+  3.1415,
+  "hello",
+  [
+    false,
+    null,
+    0
+  ],
+  {
+    "string": "world"
+  }
+]`,
+	}, {
+		desc: "ListValue with invalid UTF8 string",
+		input: &knownpb.ListValue{
+			Values: []*knownpb.Value{
+				{Kind: &knownpb.Value_StringValue{"\xff"}},
+			},
+		},
+		want:    "[\n  \"\xff\"\n]",
+		wantErr: true,
+	}, {
+		desc:  "Duration empty",
+		input: &knownpb.Duration{},
+		want:  `"0s"`,
+	}, {
+		desc:  "Duration with secs",
+		input: &knownpb.Duration{Seconds: 3},
+		want:  `"3s"`,
+	}, {
+		desc:  "Duration with -secs",
+		input: &knownpb.Duration{Seconds: -3},
+		want:  `"-3s"`,
+	}, {
+		desc:  "Duration with nanos",
+		input: &knownpb.Duration{Nanos: 1e6},
+		want:  `"0.001s"`,
+	}, {
+		desc:  "Duration with -nanos",
+		input: &knownpb.Duration{Nanos: -1e6},
+		want:  `"-0.001s"`,
+	}, {
+		desc:  "Duration with large secs",
+		input: &knownpb.Duration{Seconds: 1e10, Nanos: 1},
+		want:  `"10000000000.000000001s"`,
+	}, {
+		desc:  "Duration with 6-digit nanos",
+		input: &knownpb.Duration{Nanos: 1e4},
+		want:  `"0.000010s"`,
+	}, {
+		desc:  "Duration with 3-digit nanos",
+		input: &knownpb.Duration{Nanos: 1e6},
+		want:  `"0.001s"`,
+	}, {
+		desc:  "Duration with -secs -nanos",
+		input: &knownpb.Duration{Seconds: -123, Nanos: -450},
+		want:  `"-123.000000450s"`,
+	}, {
+		desc:    "Duration with +secs -nanos",
+		input:   &knownpb.Duration{Seconds: 1, Nanos: -1},
+		wantErr: true,
+	}, {
+		desc:    "Duration with -secs +nanos",
+		input:   &knownpb.Duration{Seconds: -1, Nanos: 1},
+		wantErr: true,
+	}, {
+		desc:    "Duration with +secs out of range",
+		input:   &knownpb.Duration{Seconds: 315576000001},
+		wantErr: true,
+	}, {
+		desc:    "Duration with -secs out of range",
+		input:   &knownpb.Duration{Seconds: -315576000001},
+		wantErr: true,
+	}, {
+		desc:    "Duration with +nanos out of range",
+		input:   &knownpb.Duration{Seconds: 0, Nanos: 1e9},
+		wantErr: true,
+	}, {
+		desc:    "Duration with -nanos out of range",
+		input:   &knownpb.Duration{Seconds: 0, Nanos: -1e9},
+		wantErr: true,
+	}, {
+		desc:  "Timestamp zero",
+		input: &knownpb.Timestamp{},
+		want:  `"1970-01-01T00:00:00Z"`,
+	}, {
+		desc:  "Timestamp",
+		input: &knownpb.Timestamp{Seconds: 1553036601},
+		want:  `"2019-03-19T23:03:21Z"`,
+	}, {
+		desc:  "Timestamp with nanos",
+		input: &knownpb.Timestamp{Seconds: 1553036601, Nanos: 1},
+		want:  `"2019-03-19T23:03:21.000000001Z"`,
+	}, {
+		desc:  "Timestamp with 6-digit nanos",
+		input: &knownpb.Timestamp{Nanos: 1e3},
+		want:  `"1970-01-01T00:00:00.000001Z"`,
+	}, {
+		desc:  "Timestamp with 3-digit nanos",
+		input: &knownpb.Timestamp{Nanos: 1e7},
+		want:  `"1970-01-01T00:00:00.010Z"`,
+	}, {
+		desc:    "Timestamp with +secs out of range",
+		input:   &knownpb.Timestamp{Seconds: 253402300800},
+		wantErr: true,
+	}, {
+		desc:    "Timestamp with -secs out of range",
+		input:   &knownpb.Timestamp{Seconds: -62135596801},
+		wantErr: true,
+	}, {
+		desc:    "Timestamp with -nanos",
+		input:   &knownpb.Timestamp{Nanos: -1},
+		wantErr: true,
+	}, {
+		desc:    "Timestamp with +nanos out of range",
+		input:   &knownpb.Timestamp{Nanos: 1e9},
+		wantErr: true,
+	}, {
+		desc:  "FieldMask empty",
+		input: &knownpb.FieldMask{},
+		want:  `""`,
+	}, {
+		desc: "FieldMask",
+		input: &knownpb.FieldMask{
+			Paths: []string{
+				"foo",
+				"foo_bar",
+				"foo.bar_qux",
+				"_foo",
+			},
+		},
+		want: `"foo,fooBar,foo.barQux,Foo"`,
+	}, {
+		desc: "FieldMask error 1",
+		input: &knownpb.FieldMask{
+			Paths: []string{"foo_"},
+		},
+		wantErr: true,
+	}, {
+		desc: "FieldMask error 2",
+		input: &knownpb.FieldMask{
+			Paths: []string{"foo__bar"},
+		},
+		wantErr: true,
+	}, {
+		desc:  "Any empty",
+		input: &knownpb.Any{},
+		want:  `{}`,
+	}, {
+		desc: "Any",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&pb2.Nested{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &pb2.Nested{
+				OptString: scalar.String("embedded inside Any"),
+				OptNested: &pb2.Nested{
+					OptString: scalar.String("inception"),
+				},
+			}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "foo/pb2.Nested",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "foo/pb2.Nested",
+  "optString": "embedded inside Any",
+  "optNested": {
+    "optString": "inception"
+  }
+}`,
+	}, {
+		desc: "Any without value",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&pb2.Nested{}).ProtoReflect().Type()),
+		},
+		input: &knownpb.Any{TypeUrl: "foo/pb2.Nested"},
+		want: `{
+  "@type": "foo/pb2.Nested"
+}`,
+	}, {
+		desc: "Any without registered type",
+		mo:   jsonpb.MarshalOptions{Resolver: preg.NewTypes()},
+		input: func() proto.Message {
+			return &knownpb.Any{TypeUrl: "foo/pb2.Nested"}
+		}(),
+		wantErr: true,
+	}, {
+		desc: "Any with missing required error",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&pb2.PartialRequired{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &pb2.PartialRequired{
+				OptString: scalar.String("embedded inside Any"),
+			}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			// TODO: Marshal may fail due to required field not set at some
+			// point. Need to ignore required not set error here.
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: string(m.ProtoReflect().Type().FullName()),
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "pb2.PartialRequired",
+  "optString": "embedded inside Any"
+}`,
+		wantErr: true,
+	}, {
+		desc: "Any with invalid UTF8",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&pb2.Nested{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &pb2.Nested{
+				OptString: scalar.String("abc\xff"),
+			}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "foo/pb2.Nested",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "foo/pb2.Nested",
+  "optString": "` + "abc\xff" + `"
+}`,
+		wantErr: true,
+	}, {
+		desc: "Any with invalid value",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&pb2.Nested{}).ProtoReflect().Type()),
+		},
+		input: &knownpb.Any{
+			TypeUrl: "foo/pb2.Nested",
+			Value:   dhex("80"),
+		},
+		wantErr: true,
+	}, {
+		desc: "Any with BoolValue",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.BoolValue{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.BoolValue{Value: true}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "type.googleapis.com/google.protobuf.BoolValue",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "type.googleapis.com/google.protobuf.BoolValue",
+  "value": true
+}`,
+	}, {
+		// TODO: Need clarification on the specification for this. See
+		// https://github.com/protocolbuffers/protobuf/issues/5390
+		desc: "Any with Empty",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.Empty{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.Empty{}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "type.googleapis.com/google.protobuf.Empty",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "type.googleapis.com/google.protobuf.Empty"
+}`,
+	}, {
+		desc: "Any with StringValue containing invalid UTF8",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.StringValue{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.StringValue{Value: "abc\xff"}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "google.protobuf.StringValue",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "google.protobuf.StringValue",
+  "value": "` + "abc\xff" + `"
+}`,
+		wantErr: true,
+	}, {
+		desc: "Any with Value of StringValue",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.Value{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.Value{Kind: &knownpb.Value_StringValue{"abc\xff"}}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "type.googleapis.com/google.protobuf.Value",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "type.googleapis.com/google.protobuf.Value",
+  "value": "` + "abc\xff" + `"
+}`,
+		wantErr: true,
+	}, {
+		desc: "Any with empty Value",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.Value{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.Value{}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "type.googleapis.com/google.protobuf.Value",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "type.googleapis.com/google.protobuf.Value"
+}`,
+	}, {
+		desc: "Any with Duration",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.Duration{}).ProtoReflect().Type()),
+		},
+		input: func() proto.Message {
+			m := &knownpb.Duration{}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "type.googleapis.com/google.protobuf.Duration",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "type.googleapis.com/google.protobuf.Duration",
+  "value": "0s"
+}`,
+	}, {
+		desc: "Any with Struct",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes(
+				(&knownpb.Struct{}).ProtoReflect().Type(),
+				(&knownpb.Value{}).ProtoReflect().Type(),
+				(&knownpb.BoolValue{}).ProtoReflect().Type(),
+				knownpb.NullValue_NULL_VALUE.Type(),
+				(&knownpb.StringValue{}).ProtoReflect().Type(),
+			),
+		},
+		input: func() proto.Message {
+			m := &knownpb.Struct{
+				Fields: map[string]*knownpb.Value{
+					"bool":   {Kind: &knownpb.Value_BoolValue{true}},
+					"null":   {Kind: &knownpb.Value_NullValue{}},
+					"string": {Kind: &knownpb.Value_StringValue{"hello"}},
+					"struct": {
+						Kind: &knownpb.Value_StructValue{
+							&knownpb.Struct{
+								Fields: map[string]*knownpb.Value{
+									"string": {Kind: &knownpb.Value_StringValue{"world"}},
+								},
+							},
+						},
+					},
+				},
+			}
+			b, err := proto.MarshalOptions{Deterministic: true}.Marshal(m)
+			if err != nil {
+				t.Fatalf("error in binary marshaling message for Any.value: %v", err)
+			}
+			return &knownpb.Any{
+				TypeUrl: "google.protobuf.Struct",
+				Value:   b,
+			}
+		}(),
+		want: `{
+  "@type": "google.protobuf.Struct",
+  "value": {
+    "bool": true,
+    "null": null,
+    "string": "hello",
+    "struct": {
+      "string": "world"
+    }
+  }
+}`,
+	}, {
+		desc: "well known types as field values",
+		mo: jsonpb.MarshalOptions{
+			Resolver: preg.NewTypes((&knownpb.Empty{}).ProtoReflect().Type()),
+		},
+		input: &pb2.KnownTypes{
+			OptBool:      &knownpb.BoolValue{Value: false},
+			OptInt32:     &knownpb.Int32Value{Value: 42},
+			OptInt64:     &knownpb.Int64Value{Value: 42},
+			OptUint32:    &knownpb.UInt32Value{Value: 42},
+			OptUint64:    &knownpb.UInt64Value{Value: 42},
+			OptFloat:     &knownpb.FloatValue{Value: 1.23},
+			OptDouble:    &knownpb.DoubleValue{Value: 3.1415},
+			OptString:    &knownpb.StringValue{Value: "hello"},
+			OptBytes:     &knownpb.BytesValue{Value: []byte("hello")},
+			OptDuration:  &knownpb.Duration{Seconds: 123},
+			OptTimestamp: &knownpb.Timestamp{Seconds: 1553036601},
+			OptStruct: &knownpb.Struct{
+				Fields: map[string]*knownpb.Value{
+					"string": {Kind: &knownpb.Value_StringValue{"hello"}},
+				},
+			},
+			OptList: &knownpb.ListValue{
+				Values: []*knownpb.Value{
+					{Kind: &knownpb.Value_NullValue{}},
+					{Kind: &knownpb.Value_StringValue{}},
+					{Kind: &knownpb.Value_StructValue{}},
+					{Kind: &knownpb.Value_ListValue{}},
+				},
+			},
+			OptValue: &knownpb.Value{},
+			OptEmpty: &knownpb.Empty{},
+			OptAny: &knownpb.Any{
+				TypeUrl: "google.protobuf.Empty",
+			},
+			OptFieldmask: &knownpb.FieldMask{
+				Paths: []string{"foo_bar", "bar_foo"},
+			},
+		},
+		want: `{
+  "optBool": false,
+  "optInt32": 42,
+  "optInt64": "42",
+  "optUint32": 42,
+  "optUint64": "42",
+  "optFloat": 1.23,
+  "optDouble": 3.1415,
+  "optString": "hello",
+  "optBytes": "aGVsbG8=",
+  "optDuration": "123s",
+  "optTimestamp": "2019-03-19T23:03:21Z",
+  "optStruct": {
+    "string": "hello"
+  },
+  "optList": [
+    null,
+    "",
+    {},
+    []
+  ],
+  "optEmpty": {},
+  "optAny": {
+    "@type": "google.protobuf.Empty"
+  },
+  "optFieldmask": "fooBar,barFoo"
+}`,
 	}}
 
 	for _, tt := range tests {
 		tt := tt
 		t.Run(tt.desc, func(t *testing.T) {
+			// Use 2-space indentation on all MarshalOptions.
+			tt.mo.Indent = "  "
 			b, err := tt.mo.Marshal(tt.input)
-			if err != nil {
+			if err != nil && !tt.wantErr {
 				t.Errorf("Marshal() returned error: %v\n", err)
 			}
+			if err == nil && tt.wantErr {
+				t.Errorf("Marshal() got nil error, want error\n")
+			}
 			got := string(b)
 			if got != tt.want {
 				t.Errorf("Marshal()\n<got>\n%v\n<want>\n%v\n", got, tt.want)
diff --git a/encoding/jsonpb/well_known_types.go b/encoding/jsonpb/well_known_types.go
new file mode 100644
index 0000000..1beb07e
--- /dev/null
+++ b/encoding/jsonpb/well_known_types.go
@@ -0,0 +1,353 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package jsonpb
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/golang/protobuf/v2/internal/errors"
+	"github.com/golang/protobuf/v2/proto"
+	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
+)
+
+// isCustomType returns true if type name has special JSON conversion rules.
+// The list of custom types here has to match the ones in marshalCustomTypes.
+func isCustomType(name pref.FullName) bool {
+	switch name {
+	case "google.protobuf.Any",
+		"google.protobuf.BoolValue",
+		"google.protobuf.DoubleValue",
+		"google.protobuf.FloatValue",
+		"google.protobuf.Int32Value",
+		"google.protobuf.Int64Value",
+		"google.protobuf.UInt32Value",
+		"google.protobuf.UInt64Value",
+		"google.protobuf.StringValue",
+		"google.protobuf.BytesValue",
+		"google.protobuf.Struct",
+		"google.protobuf.ListValue",
+		"google.protobuf.Value",
+		"google.protobuf.Duration",
+		"google.protobuf.Timestamp",
+		"google.protobuf.FieldMask":
+		return true
+	}
+	return false
+}
+
+// marshalCustomType marshals given well-known type message that have special
+// JSON conversion rules. It needs to be a message type where isCustomType
+// returns true, else it will panic.
+func (e encoder) marshalCustomType(m pref.Message) error {
+	name := m.Type().FullName()
+	switch name {
+	case "google.protobuf.Any":
+		return e.marshalAny(m)
+
+	case "google.protobuf.BoolValue",
+		"google.protobuf.DoubleValue",
+		"google.protobuf.FloatValue",
+		"google.protobuf.Int32Value",
+		"google.protobuf.Int64Value",
+		"google.protobuf.UInt32Value",
+		"google.protobuf.UInt64Value",
+		"google.protobuf.StringValue",
+		"google.protobuf.BytesValue":
+		return e.marshalKnownScalar(m)
+
+	case "google.protobuf.Struct":
+		return e.marshalStruct(m)
+
+	case "google.protobuf.ListValue":
+		return e.marshalListValue(m)
+
+	case "google.protobuf.Value":
+		return e.marshalKnownValue(m)
+
+	case "google.protobuf.Duration":
+		return e.marshalDuration(m)
+
+	case "google.protobuf.Timestamp":
+		return e.marshalTimestamp(m)
+
+	case "google.protobuf.FieldMask":
+		return e.marshalFieldMask(m)
+	}
+
+	panic(fmt.Sprintf("encoder.marshalCustomTypes(%q) does not have a custom marshaler", name))
+}
+
+func (e encoder) marshalAny(m pref.Message) error {
+	var nerr errors.NonFatal
+	msgType := m.Type()
+	knownFields := m.KnownFields()
+
+	const typeNum = 1  // string type_url.
+	const valueNum = 2 // bytes value.
+
+	// Start writing the JSON object.
+	e.StartObject()
+	defer e.EndObject()
+
+	if !knownFields.Has(typeNum) {
+		if !knownFields.Has(valueNum) {
+			// If message is empty, marshal out empty JSON object.
+			return nil
+		} else {
+			// Return error if type_url field is not set, but value is set.
+			return errors.New("field %s.type_url is not set", msgType.FullName())
+		}
+	}
+
+	typeVal := knownFields.Get(typeNum)
+	valueVal := knownFields.Get(valueNum)
+
+	// Marshal out @type field.
+	typeURL := typeVal.String()
+	e.WriteName("@type")
+	if err := e.WriteString(typeURL); !nerr.Merge(err) {
+		return err
+	}
+
+	// Resolve the type in order to unmarshal value field.
+	emt, err := e.resolver.FindMessageByURL(typeURL)
+	if !nerr.Merge(err) {
+		return errors.New("unable to resolve %v: %v", typeURL, err)
+	}
+
+	em := emt.New()
+	// TODO: Need to set types registry in binary unmarshaling.
+	err = proto.Unmarshal(valueVal.Bytes(), em.Interface())
+	if !nerr.Merge(err) {
+		return errors.New("unable to unmarshal %v: %v", typeURL, err)
+	}
+
+	// If type of value has custom JSON encoding, marshal out a field "value"
+	// with corresponding custom JSON encoding of the embedded message as a
+	// field.
+	if isCustomType(emt.FullName()) {
+		// An empty google.protobuf.Value should NOT be marshaled out.
+		if isEmptyKnownValue(pref.ValueOf(em), emt) {
+			return nil
+		}
+		e.WriteName("value")
+		return e.marshalCustomType(em)
+	}
+
+	// Else, marshal out the embedded message's fields in this Any object.
+	if err := e.marshalFields(em); !nerr.Merge(err) {
+		return err
+	}
+
+	return nerr.E
+}
+
+func (e encoder) marshalKnownScalar(m pref.Message) error {
+	msgType := m.Type()
+	fieldDescs := msgType.Fields()
+	knownFields := m.KnownFields()
+
+	const num = 1 // Field "value", type is dependent on msgType.
+	fd := fieldDescs.ByNumber(num)
+	val := knownFields.Get(num)
+	return e.marshalSingular(val, fd)
+}
+
+func (e encoder) marshalStruct(m pref.Message) error {
+	msgType := m.Type()
+	fieldDescs := msgType.Fields()
+	knownFields := m.KnownFields()
+
+	const num = 1 // map<string, Value> fields.
+	fd := fieldDescs.ByNumber(num)
+	val := knownFields.Get(num)
+	return e.marshalMap(val.Map(), fd)
+}
+
+func (e encoder) marshalListValue(m pref.Message) error {
+	msgType := m.Type()
+	fieldDescs := msgType.Fields()
+	knownFields := m.KnownFields()
+
+	const num = 1 // repeated Value values.
+	fd := fieldDescs.ByNumber(num)
+	val := knownFields.Get(num)
+	return e.marshalList(val.List(), fd)
+}
+
+// isEmptyKnownValue returns true if given val is of type google.protobuf.Value
+// and does not have any of its oneof fields set.
+func isEmptyKnownValue(val pref.Value, md pref.MessageDescriptor) bool {
+	return md != nil &&
+		md.FullName() == "google.protobuf.Value" &&
+		val.Message().KnownFields().Len() == 0
+}
+
+func (e encoder) marshalKnownValue(m pref.Message) error {
+	msgType := m.Type()
+	fieldDescs := msgType.Oneofs().Get(0).Fields()
+	knownFields := m.KnownFields()
+
+	for i := 0; i < fieldDescs.Len(); i++ {
+		fd := fieldDescs.Get(i)
+		num := fd.Number()
+		if !knownFields.Has(num) {
+			continue
+		}
+		// Only one field should be set.
+		val := knownFields.Get(num)
+		return e.marshalSingular(val, fd)
+	}
+
+	// None of the fields are set.
+	return nil
+}
+
+const (
+	secondsInNanos       = int64(time.Second / time.Nanosecond)
+	maxSecondsInDuration = int64(315576000000)
+)
+
+func (e encoder) marshalDuration(m pref.Message) error {
+	msgType := m.Type()
+	knownFields := m.KnownFields()
+
+	const secsNum = 1  // int64 seconds.
+	const nanosNum = 2 // int32 nanos.
+
+	secsVal := knownFields.Get(secsNum)
+	nanosVal := knownFields.Get(nanosNum)
+	secs := secsVal.Int()
+	nanos := nanosVal.Int()
+	if secs < -maxSecondsInDuration || secs > maxSecondsInDuration {
+		return errors.New("%s.seconds out of range", msgType.FullName())
+	}
+	if nanos <= -secondsInNanos || nanos >= secondsInNanos {
+		return errors.New("%s.nanos out of range", msgType.FullName())
+	}
+	if (secs > 0 && nanos < 0) || (secs < 0 && nanos > 0) {
+		return errors.New("%s: signs of seconds and nanos do not match", msgType.FullName())
+	}
+	// Generated output always contains 0, 3, 6, or 9 fractional digits,
+	// depending on required precision, followed by the suffix "s".
+	f := "%d.%09d"
+	if nanos < 0 {
+		nanos = -nanos
+		if secs == 0 {
+			f = "-%d.%09d"
+		}
+	}
+	x := fmt.Sprintf(f, secs, nanos)
+	x = strings.TrimSuffix(x, "000")
+	x = strings.TrimSuffix(x, "000")
+	x = strings.TrimSuffix(x, ".000")
+	e.WriteString(x + "s")
+	return nil
+}
+
+const (
+	maxTimestampSeconds = 253402300799
+	minTimestampSeconds = -62135596800
+)
+
+func (e encoder) marshalTimestamp(m pref.Message) error {
+	msgType := m.Type()
+	knownFields := m.KnownFields()
+
+	const secsNum = 1  // int64 seconds.
+	const nanosNum = 2 // int32 nanos.
+
+	secsVal := knownFields.Get(secsNum)
+	nanosVal := knownFields.Get(nanosNum)
+	secs := secsVal.Int()
+	nanos := nanosVal.Int()
+	if secs < minTimestampSeconds || secs > maxTimestampSeconds {
+		return errors.New("%s.seconds out of range", msgType.FullName())
+	}
+	if nanos < 0 || nanos >= secondsInNanos {
+		return errors.New("%s.nanos out of range", msgType.FullName())
+	}
+	// Uses RFC 3339, where generated output will be Z-normalized and uses 0, 3,
+	// 6 or 9 fractional digits.
+	t := time.Unix(secs, nanos).UTC()
+	x := t.Format("2006-01-02T15:04:05.000000000")
+	x = strings.TrimSuffix(x, "000")
+	x = strings.TrimSuffix(x, "000")
+	x = strings.TrimSuffix(x, ".000")
+	e.WriteString(x + "Z")
+	return nil
+}
+
+func (e encoder) marshalFieldMask(m pref.Message) error {
+	msgType := m.Type()
+	knownFields := m.KnownFields()
+	name := msgType.FullName()
+
+	const num = 1 // repeated string paths.
+	val := knownFields.Get(num)
+	list := val.List()
+	paths := make([]string, 0, list.Len())
+
+	for i := 0; i < list.Len(); i++ {
+		s := list.Get(i).String()
+		// Return error if conversion to camelCase is not reversible.
+		cc := camelCase(s)
+		if s != snakeCase(cc) {
+			return errors.New("%s.paths contains irreversible value %q", name, s)
+		}
+		paths = append(paths, cc)
+	}
+
+	e.WriteString(strings.Join(paths, ","))
+	return nil
+}
+
+// camelCase converts given string into camelCase where ASCII character after _
+// is turned into uppercase and _'s are removed.
+func camelCase(s string) string {
+	var b []byte
+	var afterUnderscore bool
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if afterUnderscore {
+			if isASCIILower(c) {
+				c -= 'a' - 'A'
+			}
+		}
+		if c == '_' {
+			afterUnderscore = true
+			continue
+		}
+		afterUnderscore = false
+		b = append(b, c)
+	}
+	return string(b)
+}
+
+// snakeCase converts given string into snake_case where ASCII uppercase
+// character is turned into _ + lowercase.
+func snakeCase(s string) string {
+	var b []byte
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if isASCIIUpper(c) {
+			c += 'a' - 'A'
+			b = append(b, '_', c)
+		} else {
+			b = append(b, c)
+		}
+	}
+	return string(b)
+}
+
+func isASCIILower(c byte) bool {
+	return 'a' <= c && c <= 'z'
+}
+
+func isASCIIUpper(c byte) bool {
+	return 'A' <= c && c <= 'Z'
+}
diff --git a/encoding/testprotos/pb2/test.pb.go b/encoding/testprotos/pb2/test.pb.go
index 3292ea2..68ce05e 100644
--- a/encoding/testprotos/pb2/test.pb.go
+++ b/encoding/testprotos/pb2/test.pb.go
@@ -1152,6 +1152,7 @@
 	OptValue             *known.Value       `protobuf:"bytes,27,opt,name=opt_value,json=optValue" json:"opt_value,omitempty"`
 	OptEmpty             *known.Empty       `protobuf:"bytes,30,opt,name=opt_empty,json=optEmpty" json:"opt_empty,omitempty"`
 	OptAny               *known.Any         `protobuf:"bytes,32,opt,name=opt_any,json=optAny" json:"opt_any,omitempty"`
+	OptFieldmask         *known.FieldMask   `protobuf:"bytes,40,opt,name=opt_fieldmask,json=optFieldmask" json:"opt_fieldmask,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
 	XXX_unrecognized     []byte             `json:"-"`
 	XXX_sizecache        int32              `json:"-"`
@@ -1299,6 +1300,13 @@
 	return nil
 }
 
+func (m *KnownTypes) GetOptFieldmask() *known.FieldMask {
+	if m != nil {
+		return m.OptFieldmask
+	}
+	return nil
+}
+
 type Nests_OptGroup struct {
 	OptString            *string                        `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
 	OptNested            *Nested                        `protobuf:"bytes,2,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
@@ -1660,328 +1668,334 @@
 	E_FakeMessageSetExtension_MessageSetExtension = &xxx_File_pb2_test_proto_extDescs[18]
 )
 var xxx_File_pb2_test_proto_rawdesc = []byte{
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 }
 
 var xxx_File_pb2_test_proto_rawdesc_gzipped = protoimpl.X.CompressGZIP(xxx_File_pb2_test_proto_rawdesc)
@@ -2031,6 +2045,7 @@
 	(*known.Value)(nil),                   // 35: google.protobuf.Value
 	(*known.Empty)(nil),                   // 36: google.protobuf.Empty
 	(*known.Any)(nil),                     // 37: google.protobuf.Any
+	(*known.FieldMask)(nil),               // 38: google.protobuf.FieldMask
 }
 var xxx_File_pb2_test_proto_depIdxs = []int32{
 	11, // pb2.opt_ext_bool:extendee -> pb2.Extensions
@@ -2083,6 +2098,7 @@
 	35, // pb2.KnownTypes.opt_value:type_name -> google.protobuf.Value
 	36, // pb2.KnownTypes.opt_empty:type_name -> google.protobuf.Empty
 	37, // pb2.KnownTypes.opt_any:type_name -> google.protobuf.Any
+	38, // pb2.KnownTypes.opt_fieldmask:type_name -> google.protobuf.FieldMask
 	5,  // pb2.Nests.OptGroup.opt_nested:type_name -> pb2.Nested
 	20, // pb2.Nests.OptGroup.optnestedgroup:type_name -> pb2.Nests.OptGroup.OptNestedGroup
 	9,  // pb2.IndirectRequired.StrToNestedEntry.value:type_name -> pb2.NestedWithRequired
diff --git a/encoding/testprotos/pb2/test.proto b/encoding/testprotos/pb2/test.proto
index d41583a..1b4f8d0 100644
--- a/encoding/testprotos/pb2/test.proto
+++ b/encoding/testprotos/pb2/test.proto
@@ -10,6 +10,7 @@
 
 import "google/protobuf/any.proto";
 import "google/protobuf/empty.proto";
+import "google/protobuf/field_mask.proto";
 import "google/protobuf/duration.proto";
 import "google/protobuf/struct.proto";
 import "google/protobuf/timestamp.proto";
@@ -217,4 +218,6 @@
   optional google.protobuf.Value opt_value = 27;
   optional google.protobuf.Empty opt_empty = 30;
   optional google.protobuf.Any opt_any = 32;
+
+  optional google.protobuf.FieldMask opt_fieldmask = 40;
 }