From aac0d6a6a500a83df2040e378a1c6df3da58e78b Mon Sep 17 00:00:00 2001
From: Jesus <75259437+Jolymmiles@users.noreply.github.com>
Date: Sat, 16 Aug 2025 03:07:33 +0400
Subject: [PATCH] VLESS inbound: Add option to set default `flow` (#5023)

Closes https://github.com/XTLS/Xray-core/issues/4994
---
 infra/conf/vless.go  | 14 +++++++++++++-
 proxy/vless/vless.go |  3 ++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/infra/conf/vless.go b/infra/conf/vless.go
index 5d4ace6f..1a7341b3 100644
--- a/infra/conf/vless.go
+++ b/infra/conf/vless.go
@@ -32,12 +32,20 @@ type VLessInboundConfig struct {
 	Clients    []json.RawMessage       `json:"clients"`
 	Decryption string                  `json:"decryption"`
 	Fallbacks  []*VLessInboundFallback `json:"fallbacks"`
+	Flow       string                  `json:"flow"`
 }
 
 // Build implements Buildable
 func (c *VLessInboundConfig) Build() (proto.Message, error) {
 	config := new(inbound.Config)
 	config.Clients = make([]*protocol.User, len(c.Clients))
+	switch c.Flow {
+	case vless.None:
+		c.Flow = ""
+	case "", vless.XRV:
+	default:
+		return nil, errors.New(`VLESS "settings.flow" doesn't support "` + c.Flow + `" in this version`)
+	}
 	for idx, rawUser := range c.Clients {
 		user := new(protocol.User)
 		if err := json.Unmarshal(rawUser, user); err != nil {
@@ -55,7 +63,11 @@ func (c *VLessInboundConfig) Build() (proto.Message, error) {
 		account.Id = u.String()
 
 		switch account.Flow {
-		case "", vless.XRV:
+		case "":
+			account.Flow = c.Flow
+		case vless.None:
+			account.Flow = ""
+		case vless.XRV:
 		default:
 			return nil, errors.New(`VLESS clients: "flow" doesn't support "` + account.Flow + `" in this version`)
 		}
diff --git a/proxy/vless/vless.go b/proxy/vless/vless.go
index ed63b641..bdebdca6 100644
--- a/proxy/vless/vless.go
+++ b/proxy/vless/vless.go
@@ -6,5 +6,6 @@
 package vless
 
 const (
-	XRV = "xtls-rprx-vision"
+	None = "none"
+	XRV  = "xtls-rprx-vision"
 )