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package main
import (
"crypto/tls"
"github.com/elazarl/goproxy"
"github.com/gorilla/websocket"
"log"
"net/http"
"net/url"
"os"
"os/signal"
"sync"
"time"
)
var upgrader = websocket.Upgrader{} // use default options
func echo(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Print("upgrade:", err)
return
}
defer c.Close()
for {
mt, message, err := c.ReadMessage()
if err != nil {
log.Println("read:", err)
break
}
log.Printf("recv: %s", message)
err = c.WriteMessage(mt, message)
if err != nil {
log.Println("write:", err)
break
}
}
}
func StartEchoServer(wg *sync.WaitGroup) {
log.Println("Starting echo server")
wg.Add(1)
go func() {
http.HandleFunc("/", echo)
err := http.ListenAndServeTLS(":12345", "localhost.pem", "localhost-key.pem", nil)
if err != nil {
panic("ListenAndServe: " + err.Error())
}
wg.Done()
}()
}
func StartProxy(wg *sync.WaitGroup) {
log.Println("Starting proxy server")
wg.Add(1)
go func() {
proxy := goproxy.NewProxyHttpServer()
proxy.OnRequest().HandleConnect(goproxy.AlwaysMitm)
proxy.Verbose = true
err := http.ListenAndServe(":54321", proxy)
if err != nil {
log.Fatal(err.Error())
}
wg.Done()
}()
}
func main() {
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
wg := &sync.WaitGroup{}
StartEchoServer(wg)
StartProxy(wg)
endpointUrl := "wss://localhost:12345"
proxyUrl := "http://localhost:54321"
surl, _ := url.Parse(proxyUrl)
dialer := websocket.Dialer{
Subprotocols: []string{"p1"},
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
Proxy: http.ProxyURL(surl),
}
c, _, err := dialer.Dial(endpointUrl, nil)
if err != nil {
log.Fatal("dial:", err)
}
defer c.Close()
done := make(chan struct{})
go func() {
defer c.Close()
defer close(done)
for {
_, message, err := c.ReadMessage()
if err != nil {
log.Println("read:", err)
return
}
log.Printf("recv: %s", message)
}
}()
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case t := <-ticker.C:
err := c.WriteMessage(websocket.TextMessage, []byte(t.String()))
if err != nil {
log.Println("write:", err)
return
}
case <-interrupt:
log.Println("interrupt")
// To cleanly close a connection, a client should send a close
// frame and wait for the server to close the connection.
err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
if err != nil {
log.Println("write close:", err)
return
}
select {
case <-done:
case <-time.After(time.Second):
}
c.Close()
return
}
}
}
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