fix(x/tx): add an option to encode maps using amino json (ref #23513)

x/tx/CHANGELOG.md

@@ -33,6 +33,10 @@ Since v0.13.0, x/tx follows Cosmos SDK semver: https://github.com/cosmos/cosmos-
 
 ## [Unreleased]
 
+## [v1.1.0](https://github.com/cosmos/cosmos-sdk/releases/tag/x/tx/v1.1.0) - 2025-01-28
+
+* [#23513](https://github.com/cosmos/cosmos-sdk/pull/23513), [#23539](https://github.com/cosmos/cosmos-sdk/pull/23539) Add map marshalling support (as option) to Amino JSON encoder. 
+
 ## [v1.0.1](https://github.com/cosmos/cosmos-sdk/releases/tag/x/tx/v1.0.1) - 2025-01-17
 
 * [#23324](https://github.com/cosmos/cosmos-sdk/pull/23324) Sign over unordered and timeout timestamp fields.
@@ -57,6 +61,10 @@ Identical to v1.0.0-alpha.3.
 * [#21825](https://github.com/cosmos/cosmos-sdk/pull/21825) Fix decimal encoding and field ordering in Amino JSON encoder.
 * [#21850](https://github.com/cosmos/cosmos-sdk/pull/21850) Support bytes field as signer.
 
+## [v0.13.7](https://github.com/cosmos/cosmos-sdk/releases/tag/x/tx/v0.13.7) - 2025-01-28
+
+* [#23513](https://github.com/cosmos/cosmos-sdk/pull/23513), [#23539](https://github.com/cosmos/cosmos-sdk/pull/23539) Add map marshalling support (as option) to Amino JSON encoder. 
+
 ## [v0.13.6](https://github.com/cosmos/cosmos-sdk/releases/tag/x/tx/v0.13.6) - 2024-12-12
 
 ### Bug Fixes

x/tx/signing/aminojson/json_marshal.go

@@ -242,7 +242,18 @@ func (enc Encoder) marshal(value protoreflect.Value, fd protoreflect.FieldDescri
 
 	case protoreflect.Map:
 		if enc.marshalMappings {
-			return jsonMarshal(writer, value)
+			if !val.IsValid() {
+				_, err := io.WriteString(writer, "null")
+				return err
+			}
+
+			mapData := make(map[string]interface{})
+			val.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
+				mapData[k.String()] = v.Interface()
+				return true
+			})
+
+			return jsonMarshal(writer, mapData)
 		}
 		return errors.New("maps are not supported")
 

x/tx/signing/aminojson/json_marshal_test.go

@@ -266,7 +266,6 @@ func TestIndent(t *testing.T) {
 
 	bz, err := encoder.Marshal(msg)
 	require.NoError(t, err)
-	fmt.Println(string(bz))
 	require.Equal(t, `{
 	"type": "ABitOfEverything",
 	"value": {
@@ -325,7 +324,6 @@ func TestEnumAsString(t *testing.T) {
 
 	bz, err := encoder.Marshal(msg)
 	require.NoError(t, err)
-	fmt.Println(string(bz))
 	require.Equal(t, `{
 	"type": "ABitOfEverything",
 	"value": {
@@ -384,7 +382,6 @@ func TestAminoNameAsTypeURL(t *testing.T) {
 
 	bz, err := encoder.Marshal(msg)
 	require.NoError(t, err)
-	fmt.Println(string(bz))
 	require.Equal(t, `{
 	"type": "/testpb.ABitOfEverything",
 	"value": {
@@ -416,6 +413,32 @@ func TestAminoNameAsTypeURL(t *testing.T) {
 }`, string(bz))
 }
 
+func TestMarshalMappings(t *testing.T) {
+	// valid
+	encoder := aminojson.NewEncoder(aminojson.EncoderOptions{Indent: "	", MarshalMappings: true})
+
+	msg := &testpb.WithAMap{
+		StrMap: map[string]string{
+			"foo": "bar",
+			"baz": "qux",
+		},
+	}
+
+	bz, err := encoder.Marshal(msg)
+	require.NoError(t, err)
+	require.Equal(t, `{
+	"str_map": {
+		"baz": "qux",
+		"foo": "bar"
+	}
+}`, string(bz))
+
+	// invalid
+	encoder = aminojson.NewEncoder(aminojson.EncoderOptions{Indent: "	", MarshalMappings: false})
+	_, err = encoder.Marshal(msg)
+	require.Error(t, err)
+}
+
 func TestCustomBytesEncoder(t *testing.T) {
 	cdc := amino.NewCodec()
 	cdc.RegisterConcrete(&testpb.ABitOfEverything{}, "ABitOfEverything", nil)