119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
package ngkrok
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import (
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"context"
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"crypto/rand"
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"io"
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"log"
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"net"
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"net/http"
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"strings"
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vhost "github.com/inconshreveable/go-vhost"
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"github.com/progrium/qmux/golang/session"
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)
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const (
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SERVER_VERSION = "v0.5"
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HEADER_CLIENT_TOKEN = "X-Client-App-Token"
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HEADER_PUBLIC_HOST = "X-Public-Host"
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)
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type Server struct {
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addr string
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host string
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port string
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VMux *vhost.HTTPMuxer
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}
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func NewServer(addr, host, port string, vmux *vhost.HTTPMuxer) *Server {
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return &Server{addr, host, port, vmux}
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}
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func (s *Server) Serve() {
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ml, err := s.VMux.Listen(net.JoinHostPort(s.host, s.port))
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if err != nil {
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log.Fatal(err)
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}
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srv := &http.Server{}
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// http.HandleFunc("/", s.mainHandler)
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http.HandleFunc("/register", s.registerHandler)
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srv.Serve(ml)
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}
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// func (s *Server) mainHandler(w http.ResponseWriter, r *http.Request) {
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// log.Println("mainHandler")
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// return
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// }
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func (s *Server) registerHandler(w http.ResponseWriter, r *http.Request) {
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subdomain := newSubdomain(r) + s.host
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publicHost := strings.TrimSuffix(net.JoinHostPort(subdomain, s.port), ":80")
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pl, err := s.VMux.Listen(publicHost)
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if err != nil {
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log.Fatal(err)
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}
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defer pl.Close()
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w.Header().Add(HEADER_PUBLIC_HOST, subdomain)
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w.Header().Add("Connection", "close")
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w.WriteHeader(http.StatusOK)
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conn, _, _ := w.(http.Hijacker).Hijack()
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sess := session.New(conn)
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defer sess.Close()
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log.Printf("%s: start session", subdomain)
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go func() {
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for {
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conn, err := pl.Accept()
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if err != nil {
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log.Println("Accept:", err)
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return
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}
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defer conn.Close()
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ch, err := sess.Open(context.Background())
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if err != nil {
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log.Println("sess.Open:", err)
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return
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}
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defer ch.Close()
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go join(ch, conn)
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}
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}()
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sess.Wait()
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log.Printf("%s: end session", subdomain)
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}
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func join(a io.ReadWriteCloser, b io.ReadWriteCloser) {
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go io.Copy(b, a)
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io.Copy(a, b)
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a.Close()
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b.Close()
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}
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func newSubdomain(r *http.Request) string {
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clientToken := r.Header.Get(HEADER_CLIENT_TOKEN)
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if clientToken == "ghd7H8H*&6tg8*tg68" { // hardcoded token for dev tests....
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return "test."
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}
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b := make([]byte, 10)
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if _, err := rand.Read(b); err != nil {
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panic(err)
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}
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letters := []rune("abcdefghijklmnopqrstuvwxyz1234567890")
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rune := make([]rune, 10)
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for i := range rune {
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rune[i] = letters[int(b[i])*len(letters)/256]
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}
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return string(rune) + "."
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}
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