XTLS Vision: Add testpre (outbound pre-connect) and testseed (outbound & inbound) (#5270)

https://t.me/projectXtls/1034

---------

Co-authored-by: 风扇滑翔翼 <Fangliding.fshxy@outlook.com>

infra/conf/vless.go

@@ -34,6 +34,7 @@ type VLessInboundConfig struct {
 	Decryption string                  `json:"decryption"`
 	Fallbacks  []*VLessInboundFallback `json:"fallbacks"`
 	Flow       string                  `json:"flow"`
+	Testseed   []uint32                `json:"testseed"`
 }
 
 // Build implements Buildable
@@ -73,6 +74,10 @@ func (c *VLessInboundConfig) Build() (proto.Message, error) {
 			return nil, errors.New(`VLESS clients: "flow" doesn't support "` + account.Flow + `" in this version`)
 		}
 
+		if len(account.Testseed) < 4 {
+			account.Testseed = c.Testseed
+		}
+
 		if account.Encryption != "" {
 			return nil, errors.New(`VLESS clients: "encryption" should not be in inbound settings`)
 		}
@@ -212,6 +217,8 @@ type VLessOutboundConfig struct {
 	Seed       string                `json:"seed"`
 	Encryption string                `json:"encryption"`
 	Reverse    *vless.Reverse        `json:"reverse"`
+	Testpre    uint32                `json:"testpre"`
+	Testseed   []uint32              `json:"testseed"`
 	Vnext      []*VLessOutboundVnext `json:"vnext"`
 }
 
@@ -258,6 +265,8 @@ func (c *VLessOutboundConfig) Build() (proto.Message, error) {
 				//account.Seed = c.Seed
 				account.Encryption = c.Encryption
 				account.Reverse = c.Reverse
+				account.Testpre = c.Testpre
+				account.Testseed = c.Testseed
 			} else {
 				if err := json.Unmarshal(rawUser, account); err != nil {
 					return nil, errors.New(`VLESS users: invalid user`).Base(err)