fix: accept plain seconds for user_manager duration fields

option/user_manager.go

@@ -1,15 +1,46 @@
 package option
 
 import (
+	"encoding/json"
+	"time"
+
 	"github.com/sagernet/sing/common/json/badoption"
 )
 
+type DurationSeconds time.Duration
+
+func (d *DurationSeconds) UnmarshalJSON(b []byte) error {
+	var n int64
+	if err := json.Unmarshal(b, &n); err == nil {
+		*d = DurationSeconds(time.Duration(n) * time.Second)
+		return nil
+	}
+	var s string
+	if err := json.Unmarshal(b, &s); err == nil {
+		dur, err := time.ParseDuration(s)
+		if err != nil {
+			return err
+		}
+		*d = DurationSeconds(dur)
+		return nil
+	}
+	return nil
+}
+
+func (d DurationSeconds) MarshalJSON() ([]byte, error) {
+	return json.Marshal(time.Duration(d).String())
+}
+
+func (d DurationSeconds) Build() time.Duration {
+	return time.Duration(d)
+}
+
 type UserManagerOptions struct {
-	AuthServer      string             `json:"auth_server,omitempty"`
+	AuthServer      string           `json:"auth_server,omitempty"`
 	Timeout         badoption.Duration `json:"timeout,omitempty"`
-	CacheTTL        badoption.Duration `json:"cache_ttl,omitempty"`
-	RefreshInterval badoption.Duration `json:"refresh_interval,omitempty"`
-	ReportInterval  badoption.Duration `json:"report_interval,omitempty"`
+	CacheTTL        DurationSeconds  `json:"cache_ttl,omitempty"`
+	RefreshInterval DurationSeconds  `json:"refresh_interval,omitempty"`
+	ReportInterval  DurationSeconds  `json:"report_interval,omitempty"`
 	ReportTraffic   bool               `json:"report_traffic,omitempty"`
 	APISecret       string             `json:"api_secret,omitempty"`
 	APIListen       string             `json:"api_listen,omitempty"`

service/usermanager/manager.go

@@ -87,9 +87,9 @@ func New(ctx context.Context, logger log.ContextLogger, tag string, options opti
 		logger:         logger,
 		authServer:     options.AuthServer,
 		timeout:        time.Duration(options.Timeout),
-		cacheTTL:       time.Duration(options.CacheTTL),
-		refreshInt:     time.Duration(options.RefreshInterval),
-		reportInt:      time.Duration(options.ReportInterval),
+		cacheTTL:       options.CacheTTL.Build(),
+		refreshInt:     options.RefreshInterval.Build(),
+		reportInt:      options.ReportInterval.Build(),
 		reportTraffic:  options.ReportTraffic,
 		apiSecret:      options.APISecret,
 		apiListen:      options.APIListen,