badjson: Refactor TypedMap to handle multiple key types

Author: nekohasekai

common/json/badjson/typed.go

@@ -9,11 +9,11 @@ import (
 	"github.com/sagernet/sing/common/x/linkedhashmap"
 )
 
-type TypedMap[T any] struct {
-	linkedhashmap.Map[string, T]
+type TypedMap[K comparable, V any] struct {
+	linkedhashmap.Map[K, V]
 }
 
-func (m TypedMap[T]) MarshalJSON() ([]byte, error) {
+func (m TypedMap[K, V]) MarshalJSON() ([]byte, error) {
 	buffer := new(bytes.Buffer)
 	buffer.WriteString("{")
 	items := m.Entries()
@@ -38,7 +38,7 @@ func (m TypedMap[T]) MarshalJSON() ([]byte, error) {
 	return buffer.Bytes(), nil
 }
 
-func (m *TypedMap[T]) UnmarshalJSON(content []byte) error {
+func (m *TypedMap[K, V]) UnmarshalJSON(content []byte) error {
 	decoder := json.NewDecoder(bytes.NewReader(content))
 	m.Clear()
 	objectStart, err := decoder.Token()
@@ -60,15 +60,14 @@ func (m *TypedMap[T]) UnmarshalJSON(content []byte) error {
 	return nil
 }
 
-func (m *TypedMap[T]) decodeJSON(decoder *json.Decoder) error {
+func (m *TypedMap[K, V]) decodeJSON(decoder *json.Decoder) error {
 	for decoder.More() {
-		var entryKey string
-		keyToken, err := decoder.Token()
+		var entryKey K
+		err := decoder.Decode(&entryKey)
 		if err != nil {
 			return err
 		}
-		entryKey = keyToken.(string)
-		var entryValue T
+		var entryValue V
 		err = decoder.Decode(&entryValue)
 		if err != nil {
 			return err