json: Add badoption templates

common/json/badjson/merge_objects.go

@@ -0,0 +1,60 @@
+package badjson
+
+import (
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/json"
+)
+
+func MarshallObjects(objects ...any) ([]byte, error) {
+	if len(objects) == 1 {
+		return json.Marshal(objects[0])
+	}
+	var content JSONObject
+	for _, object := range objects {
+		objectMap, err := newJSONObject(object)
+		if err != nil {
+			return nil, err
+		}
+		content.PutAll(objectMap)
+	}
+	return content.MarshalJSON()
+}
+
+func UnmarshallExcluded(inputContent []byte, parentObject any, object any) error {
+	parentContent, err := newJSONObject(parentObject)
+	if err != nil {
+		return err
+	}
+	var content JSONObject
+	err = content.UnmarshalJSON(inputContent)
+	if err != nil {
+		return err
+	}
+	for _, key := range parentContent.Keys() {
+		content.Remove(key)
+	}
+	if object == nil {
+		if content.IsEmpty() {
+			return nil
+		}
+		return E.New("unexpected key: ", content.Keys()[0])
+	}
+	inputContent, err = content.MarshalJSON()
+	if err != nil {
+		return err
+	}
+	return json.UnmarshalDisallowUnknownFields(inputContent, object)
+}
+
+func newJSONObject(object any) (*JSONObject, error) {
+	inputContent, err := json.Marshal(object)
+	if err != nil {
+		return nil, err
+	}
+	var content JSONObject
+	err = content.UnmarshalJSON(inputContent)
+	if err != nil {
+		return nil, err
+	}
+	return &content, nil
+}