Feature: support trojan websocket

transport/trojan/trojan.go

@@ -8,10 +8,12 @@ import (
 	"errors"
 	"io"
 	"net"
+	"net/http"
 	"sync"
 
 	"github.com/Dreamacro/clash/common/pool"
 	"github.com/Dreamacro/clash/transport/socks5"
+	"github.com/Dreamacro/clash/transport/vmess"
 )
 
 const (
@@ -38,6 +40,13 @@ type Option struct {
 	SkipCertVerify bool
 }
 
+type WebsocketOption struct {
+	Host    string
+	Port    string
+	Path    string
+	Headers http.Header
+}
+
 type Trojan struct {
 	option      *Option
 	hexPassword []byte
@@ -64,6 +73,29 @@ func (t *Trojan) StreamConn(conn net.Conn) (net.Conn, error) {
 	return tlsConn, nil
 }
 
+func (t *Trojan) StreamWebsocketConn(conn net.Conn, wsOptions *WebsocketOption) (net.Conn, error) {
+	alpn := defaultALPN
+	if len(t.option.ALPN) != 0 {
+		alpn = t.option.ALPN
+	}
+
+	tlsConfig := &tls.Config{
+		NextProtos:         alpn,
+		MinVersion:         tls.VersionTLS12,
+		InsecureSkipVerify: t.option.SkipCertVerify,
+		ServerName:         t.option.ServerName,
+	}
+
+	return vmess.StreamWebsocketConn(conn, &vmess.WebsocketConfig{
+		Host:      wsOptions.Host,
+		Port:      wsOptions.Port,
+		Path:      wsOptions.Path,
+		Headers:   wsOptions.Headers,
+		TLS:       true,
+		TLSConfig: tlsConfig,
+	})
+}
+
 func (t *Trojan) WriteHeader(w io.Writer, command Command, socks5Addr []byte) error {
 	buf := pool.GetBuffer()
 	defer pool.PutBuffer(buf)