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websocket.go
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websocket.go
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// Copyright 2024 Jigsaw Operations LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"context"
"errors"
"fmt"
"net"
"net/url"
"strings"
"github.com/Jigsaw-Code/outline-sdk/transport"
"golang.org/x/net/websocket"
)
type wsConfig struct {
tcpPath string
udpPath string
}
func parseWSConfig(configURL *url.URL) (*wsConfig, error) {
query := configURL.Opaque
values, err := url.ParseQuery(query)
if err != nil {
return nil, err
}
var cfg wsConfig
for key, values := range values {
switch strings.ToLower(key) {
case "tcp_path":
if len(values) != 1 {
return nil, fmt.Errorf("udp_path option must has one value, found %v", len(values))
}
cfg.tcpPath = values[0]
case "udp_path":
if len(values) != 1 {
return nil, fmt.Errorf("tcp_path option must has one value, found %v", len(values))
}
cfg.udpPath = values[0]
default:
return nil, fmt.Errorf("unsupported option %v", key)
}
}
return &cfg, nil
}
// wsToStreamConn converts a [websocket.Conn] to a [transport.StreamConn].
type wsToStreamConn struct {
*websocket.Conn
}
func (c *wsToStreamConn) CloseRead() error {
// Nothing to do.
return nil
}
func (c *wsToStreamConn) CloseWrite() error {
return c.Close()
}
func wrapStreamDialerWithWebSocket(innerSD func() (transport.StreamDialer, error), _ func() (transport.PacketDialer, error), configURL *url.URL) (transport.StreamDialer, error) {
sd, err := innerSD()
if err != nil {
return nil, err
}
config, err := parseWSConfig(configURL)
if err != nil {
return nil, err
}
if config.tcpPath == "" {
return nil, errors.New("must specify tcp_path")
}
return transport.FuncStreamDialer(func(ctx context.Context, addr string) (transport.StreamConn, error) {
wsURL := url.URL{Scheme: "ws", Host: addr, Path: config.tcpPath}
origin := url.URL{Scheme: "http", Host: addr}
wsCfg, err := websocket.NewConfig(wsURL.String(), origin.String())
if err != nil {
return nil, fmt.Errorf("failed to create websocket config: %w", err)
}
baseConn, err := sd.DialStream(ctx, addr)
if err != nil {
return nil, fmt.Errorf("failed to connect to websocket endpoint: %w", err)
}
wsConn, err := websocket.NewClient(wsCfg, baseConn)
if err != nil {
baseConn.Close()
return nil, fmt.Errorf("failed to create websocket client: %w", err)
}
return &wsToStreamConn{wsConn}, nil
}), nil
}
func wrapPacketDialerWithWebSocket(innerSD func() (transport.StreamDialer, error), _ func() (transport.PacketDialer, error), configURL *url.URL) (transport.PacketDialer, error) {
sd, err := innerSD()
if err != nil {
return nil, err
}
config, err := parseWSConfig(configURL)
if err != nil {
return nil, err
}
if config.udpPath == "" {
return nil, errors.New("must specify udp_path")
}
return transport.FuncPacketDialer(func(ctx context.Context, addr string) (net.Conn, error) {
wsURL := url.URL{Scheme: "ws", Host: addr, Path: config.udpPath}
origin := url.URL{Scheme: "http", Host: addr}
wsCfg, err := websocket.NewConfig(wsURL.String(), origin.String())
if err != nil {
return nil, fmt.Errorf("failed to create websocket config: %w", err)
}
baseConn, err := sd.DialStream(ctx, addr)
if err != nil {
return nil, fmt.Errorf("failed to connect to websocket endpoint: %w", err)
}
wsConn, err := websocket.NewClient(wsCfg, baseConn)
if err != nil {
baseConn.Close()
return nil, fmt.Errorf("failed to create websocket client: %w", err)
}
return wsConn, nil
}), nil
}