go-tunnel/cmd/server/main.go

88 lines
2.0 KiB
Go
Raw Normal View History

2020-10-21 18:00:15 +02:00
package main
import (
"context"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strings"
"time"
"cdr.dev/slog"
"forge.cadoles.com/wpetit/go-tunnel"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
const sharedKey = "go-tunnel"
const salt = "go-tunnel"
var registry = NewRegistry()
func main() {
ctx := context.Background()
logger.SetLevel(slog.LevelDebug)
server := tunnel.NewServer(
tunnel.WithServerAESBlockCrypt(sharedKey, salt),
tunnel.WithServerOnClientAuth(registry.OnClientAuth),
tunnel.WithServerOnClientDisconnect(registry.OnClientDisconnect),
)
go func() {
if err := server.Listen(ctx); err != nil {
logger.Fatal(ctx, "error while listening", logger.E(err))
}
}()
if err := http.ListenAndServe(":3003", http.HandlerFunc(handleRequest)); err != nil {
logger.Fatal(ctx, "error while listening", logger.E(err))
}
}
func handleRequest(w http.ResponseWriter, r *http.Request) {
subdomains := strings.SplitN(r.Host, ".", 2)
if len(subdomains) < 2 {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
clientID := subdomains[0]
remoteClient := registry.Get(clientID)
if remoteClient == nil {
http.Error(w, http.StatusText(http.StatusBadGateway), http.StatusBadGateway)
return
}
target, err := url.Parse("http://localhost:3000")
if err != nil {
logger.Fatal(r.Context(), "could not parse url", logger.E(err))
}
reverse := httputil.NewSingleHostReverseProxy(target)
reverse.Transport = &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: func(ctx context.Context, network string, addr string) (net.Conn, error) {
conn, err := remoteClient.Proxy(ctx, network, addr)
if err != nil {
return nil, errors.WithStack(err)
}
return conn, nil
},
ForceAttemptHTTP2: true,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
reverse.ServeHTTP(w, r)
}