chore: support KeyReplacer in Structure Decoder

adapter/outbound/hysteria.go

@@ -99,7 +99,6 @@ type HysteriaOption struct {
 	Down                string   `proxy:"down"`
 	DownSpeed           int      `proxy:"down-speed,omitempty"` // compatible with Stash
 	Auth                string   `proxy:"auth,omitempty"`
-	OldAuthString       string   `proxy:"auth_str,omitempty"`
 	AuthString          string   `proxy:"auth-str,omitempty"`
 	Obfs                string   `proxy:"obfs,omitempty"`
 	SNI                 string   `proxy:"sni,omitempty"`

adapter/parser.go

@@ -9,14 +9,10 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 )
 
-func ParseProxy(mapping map[string]any) (C.Proxy, error) {
+var keyReplacer = strings.NewReplacer("_", "-")
-	newMapping := make(map[string]any)
-	for key := range mapping {
-		newMapping[strings.ReplaceAll(key, "_", "-")] = mapping[key]
-	}
-	mapping = newMapping
 
-	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
+func ParseProxy(mapping map[string]any) (C.Proxy, error) {
+	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true, KeyReplacer: keyReplacer})
 	proxyType, existType := mapping["type"].(string)
 	if !existType {
 		return nil, fmt.Errorf("missing type")

common/structure/structure.go

@@ -13,6 +13,7 @@ import (
 type Option struct {
 	TagName          string
 	WeaklyTypedInput bool
+	KeyReplacer      *strings.Replacer
 }
 
 // Decoder is the core of structure
@@ -48,7 +49,24 @@ func (d *Decoder) Decode(src map[string]any, dst any) error {
 		key, omitKey, found := strings.Cut(tag, ",")
 		omitempty := found && omitKey == "omitempty"
 
+		if d.option.KeyReplacer != nil {
+			key = d.option.KeyReplacer.Replace(key)
+		}
+
 		value, ok := src[key]
+		if !ok {
+			for _strKey := range src {
+				strKey := _strKey
+				if d.option.KeyReplacer != nil {
+					strKey = d.option.KeyReplacer.Replace(strKey)
+				}
+				if strings.EqualFold(key, strKey) {
+					value = src[_strKey]
+					ok = true
+					break
+				}
+			}
+		}
 		if !ok || value == nil {
 			if omitempty {
 				continue
@@ -346,6 +364,9 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		tagValue = strings.SplitN(tagValue, ",", 2)[0]
 		if tagValue != "" {
 			fieldName = tagValue
+			if d.option.KeyReplacer != nil {
+				fieldName = d.option.KeyReplacer.Replace(fieldName)
+			}
 		}
 
 		rawMapKey := reflect.ValueOf(fieldName)
@@ -359,6 +380,9 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 					// Not a string key
 					continue
 				}
+				if d.option.KeyReplacer != nil {
+					mK = d.option.KeyReplacer.Replace(mK)
+				}
 
 				if strings.EqualFold(mK, fieldName) {
 					rawMapKey = dataValKey