[Go][Experimental] Support additionalProperties

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java

@@ -222,9 +222,12 @@ public Map<String, Object> postProcessModels(Map<String, Object> objs) {
                 if (model.anyOf != null && !model.anyOf.isEmpty()) {
                     imports.add(createMapping("import", "fmt"));
                 }
-            }
-
 
+                // add x-additional-properties
+                if ("map[string]map[string]interface{}".equals(model.parent)) {
+                    model.vendorExtensions.put("x-additional-properties", true);
+                }
+            }
         }
         return objs;
     }

modules/openapi-generator/src/main/resources/go-experimental/model_simple.mustache

@@ -13,8 +13,15 @@ type {{classname}} struct {
 {{/description}}
 	{{name}} {{^required}}{{^isNullable}}*{{/isNullable}}{{/required}}{{{dataType}}} `json:"{{baseName}}{{^required}},omitempty{{/required}}"{{#withXml}} xml:"{{baseName}}{{#isXmlAttribute}},attr{{/isXmlAttribute}}"{{/withXml}}{{#vendorExtensions.x-go-custom-tag}} {{{.}}}{{/vendorExtensions.x-go-custom-tag}}`
 {{/vars}}
+{{#vendorExtensions.x-additional-properties}}
+	AdditionalProperties map[string]interface{}
+{{/vendorExtensions.x-additional-properties}}
 }
 
+{{#vendorExtensions.x-additional-properties}}
+type _{{{classname}}} {{{classname}}}
+
+{{/vendorExtensions.x-additional-properties}}
 // New{{classname}} instantiates a new {{classname}} object
 // This constructor will assign default values to properties that have it defined,
 // and makes sure properties required by API are set, but the set of arguments
@@ -246,7 +253,35 @@ func (o {{classname}}) MarshalJSON() ([]byte, error) {
 	}
 	{{/isNullable}}
 	{{/vars}}
+	{{#vendorExtensions.x-additional-properties}}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
+	{{/vendorExtensions.x-additional-properties}}
 	return json.Marshal(toSerialize)
 }
 
-{{>nullable_model}}
+{{#vendorExtensions.x-additional-properties}}
+func (o *{{{classname}}}) UnmarshalJSON(bytes []byte) (err error) {
+	var{{{classname}}} := _{{{classname}}}{}
+
+	if err = json.Unmarshal(bytes, &var{{{classname}}}); err == nil {
+		*o = {{{classname}}}(var{{{classname}}})
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		{{#vars}}
+		delete(additionalProperties, "{{{baseName}}}")
+		{{/vars}}
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
+{{/vendorExtensions.x-additional-properties}}
+{{>nullable_model}}

modules/openapi-generator/src/test/resources/3_0/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml

@@ -1810,6 +1810,7 @@ components:
           type: string
     banana:
       type: object
+      additionalProperties: true
       properties:
         lengthCm:
           type: number

samples/client/petstore/go-experimental/go-petstore/model_200_response.go

@@ -147,3 +147,4 @@ func (v *NullableModel200Response) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_any_type.go

@@ -16,8 +16,11 @@ import (
 // AdditionalPropertiesAnyType struct for AdditionalPropertiesAnyType
 type AdditionalPropertiesAnyType struct {
 	Name *string `json:"name,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _AdditionalPropertiesAnyType AdditionalPropertiesAnyType
+
 // NewAdditionalPropertiesAnyType instantiates a new AdditionalPropertiesAnyType object
 // This constructor will assign default values to properties that have it defined,
 // and makes sure properties required by API are set, but the set of arguments
@@ -72,9 +75,31 @@ func (o AdditionalPropertiesAnyType) MarshalJSON() ([]byte, error) {
 	if o.Name != nil {
 		toSerialize["name"] = o.Name
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *AdditionalPropertiesAnyType) UnmarshalJSON(bytes []byte) (err error) {
+	varAdditionalPropertiesAnyType := _AdditionalPropertiesAnyType{}
+
+	if err = json.Unmarshal(bytes, &varAdditionalPropertiesAnyType); err == nil {
+		*o = AdditionalPropertiesAnyType(varAdditionalPropertiesAnyType)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "name")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableAdditionalPropertiesAnyType struct {
 	value *AdditionalPropertiesAnyType
 	isSet bool
@@ -111,3 +136,4 @@ func (v *NullableAdditionalPropertiesAnyType) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_array.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesArray) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_boolean.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesBoolean) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go

@@ -471,3 +471,4 @@ func (v *NullableAdditionalPropertiesClass) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_integer.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesInteger) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_number.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesNumber) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_object.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesObject) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_additional_properties_string.go

@@ -111,3 +111,4 @@ func (v *NullableAdditionalPropertiesString) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_animal.go

@@ -144,3 +144,4 @@ func (v *NullableAnimal) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_api_response.go

@@ -183,3 +183,4 @@ func (v *NullableApiResponse) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go

@@ -111,3 +111,4 @@ func (v *NullableArrayOfArrayOfNumberOnly) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go

@@ -111,3 +111,4 @@ func (v *NullableArrayOfNumberOnly) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_array_test_.go

@@ -183,3 +183,4 @@ func (v *NullableArrayTest) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_big_cat.go

@@ -120,3 +120,4 @@ func (v *NullableBigCat) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_big_cat_all_of.go

@@ -111,3 +111,4 @@ func (v *NullableBigCatAllOf) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_capitalization.go

@@ -292,3 +292,4 @@ func (v *NullableCapitalization) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_cat.go

@@ -120,3 +120,4 @@ func (v *NullableCat) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_cat_all_of.go

@@ -111,3 +111,4 @@ func (v *NullableCatAllOf) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_category.go

@@ -142,3 +142,4 @@ func (v *NullableCategory) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_class_model.go

@@ -111,3 +111,4 @@ func (v *NullableClassModel) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_client.go

@@ -111,3 +111,4 @@ func (v *NullableClient) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_dog.go

@@ -120,3 +120,4 @@ func (v *NullableDog) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_dog_all_of.go

@@ -111,3 +111,4 @@ func (v *NullableDogAllOf) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_enum_arrays.go

@@ -147,3 +147,4 @@ func (v *NullableEnumArrays) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_enum_test_.go

@@ -248,3 +248,4 @@ func (v *NullableEnumTest) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_file.go

@@ -112,3 +112,4 @@ func (v *NullableFile) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go

@@ -147,3 +147,4 @@ func (v *NullableFileSchemaTestClass) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_format_test_.go

@@ -553,3 +553,4 @@ func (v *NullableFormatTest) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go

@@ -147,3 +147,4 @@ func (v *NullableHasOnlyReadOnly) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_list.go

@@ -111,3 +111,4 @@ func (v *NullableList) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_map_test_.go

@@ -219,3 +219,4 @@ func (v *NullableMapTest) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go

@@ -184,3 +184,4 @@ func (v *NullableMixedPropertiesAndAdditionalPropertiesClass) UnmarshalJSON(src
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_name.go

@@ -212,3 +212,4 @@ func (v *NullableName) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_number_only.go

@@ -111,3 +111,4 @@ func (v *NullableNumberOnly) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_order.go

@@ -297,3 +297,4 @@ func (v *NullableOrder) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_outer_composite.go

@@ -183,3 +183,4 @@ func (v *NullableOuterComposite) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_pet.go

@@ -278,3 +278,4 @@ func (v *NullablePet) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_read_only_first.go

@@ -147,3 +147,4 @@ func (v *NullableReadOnlyFirst) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_return.go

@@ -111,3 +111,4 @@ func (v *NullableReturn) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_special_model_name.go

@@ -111,3 +111,4 @@ func (v *NullableSpecialModelName) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_tag.go

@@ -147,3 +147,4 @@ func (v *NullableTag) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_type_holder_default.go

@@ -224,3 +224,4 @@ func (v *NullableTypeHolderDefault) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_type_holder_example.go

@@ -249,3 +249,4 @@ func (v *NullableTypeHolderExample) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_user.go

@@ -364,3 +364,4 @@ func (v *NullableUser) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/client/petstore/go-experimental/go-petstore/model_xml_item.go

@@ -1119,3 +1119,4 @@ func (v *NullableXmlItem) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml

@@ -1925,6 +1925,7 @@ components:
           type: string
       type: object
     banana:
+      additionalProperties: true
       properties:
         lengthCm:
           type: number

samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go

@@ -147,3 +147,4 @@ func (v *NullableModel200Response) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go

@@ -111,3 +111,4 @@ func (v *NullableSpecialModelName) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go

@@ -147,3 +147,4 @@ func (v *NullableAdditionalPropertiesClass) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go

@@ -144,3 +144,4 @@ func (v *NullableAnimal) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go

@@ -183,3 +183,4 @@ func (v *NullableApiResponse) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_apple.go

@@ -111,3 +111,4 @@ func (v *NullableApple) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_apple_req.go

@@ -140,3 +140,4 @@ func (v *NullableAppleReq) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+

samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go

@@ -111,3 +111,4 @@ func (v *NullableArrayOfArrayOfNumberOnly) UnmarshalJSON(src []byte) error {
 	return json.Unmarshal(src, &v.value)
 }
 
+