Introduce user level

proxy/vmess/config/json/user.go

@@ -10,12 +10,14 @@ import (
 type ConfigUser struct {
 	Id    *config.ID
 	Email string
+  LevelValue config.UserLevel
 }
 
 func (u *ConfigUser) UnmarshalJSON(data []byte) error {
 	type rawUser struct {
 		IdString    string `json:"id"`
 		EmailString string `json:"email"`
+    LevelInt int `json:"level"`
 	}
 	var rawUserValue rawUser
 	if err := json.Unmarshal(data, &rawUserValue); err != nil {
@@ -27,9 +29,14 @@ func (u *ConfigUser) UnmarshalJSON(data []byte) error {
 	}
 	u.Id = id
 	u.Email = rawUserValue.EmailString
+  u.LevelValue = config.UserLevel(rawUserValue.LevelInt)
 	return nil
 }
 
 func (u *ConfigUser) ID() *config.ID {
 	return u.Id
 }
+
+func (this *ConfigUser) Level() config.UserLevel {
+  return this.LevelValue
+}