Refactor json

common/badjson/array.go

@@ -0,0 +1,46 @@
+package badjson
+
+import (
+	"bytes"
+
+	"github.com/goccy/go-json"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type JSONArray[T any] []T
+
+func (a JSONArray[T]) MarshalJSON() ([]byte, error) {
+	return json.Marshal([]T(a))
+}
+
+func (a *JSONArray[T]) UnmarshalJSON(content []byte) error {
+	decoder := json.NewDecoder(bytes.NewReader(content))
+	arrayStart, err := decoder.Token()
+	if err != nil {
+		return err
+	} else if arrayStart != json.Delim('[') {
+		return E.New("excepted array start, but got ", arrayStart)
+	}
+	err = a.decodeJSON(decoder)
+	if err != nil {
+		return err
+	}
+	arrayEnd, err := decoder.Token()
+	if err != nil {
+		return err
+	} else if arrayEnd != json.Delim(']') {
+		return E.New("excepted array end, but got ", arrayEnd)
+	}
+	return nil
+}
+
+func (a *JSONArray[T]) decodeJSON(decoder *json.Decoder) error {
+	for decoder.More() {
+		var item T
+		err := decoder.Decode(&item)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}