VMess: Returns clearer error in AuthIDDecoderHolder (#5090)

proxy/vmess/aead/authid.go

@@ -18,6 +18,8 @@ import (
 
 var (
 	ErrNotFound     = errors.New("user do not exist")
+	ErrNeagtiveTime = errors.New("timestamp is negative")
+	ErrInvalidTime  = errors.New("invalid timestamp, perhaps unsynchronized time")
 	ErrReplay       = errors.New("replayed request")
 )
 
@@ -102,11 +104,11 @@ func (a *AuthIDDecoderHolder) Match(authID [16]byte) (interface{}, error) {
 		}
 
 		if t < 0 {
-			continue
+			return nil, ErrNeagtiveTime
 		}
 
 		if math.Abs(math.Abs(float64(t))-float64(time.Now().Unix())) > 120 {
-			continue
+			return nil, ErrInvalidTime
 		}
 
 		if !a.filter.Check(authID[:]) {