Add WebTorrent module

cmd/webtorrent/init.go

@@ -0,0 +1,164 @@
+package webtorrent
+
+import (
+	"errors"
+	"fmt"
+	"github.com/AlexxIT/go2rtc/cmd/api"
+	"github.com/AlexxIT/go2rtc/cmd/app"
+	"github.com/AlexxIT/go2rtc/cmd/streams"
+	"github.com/AlexxIT/go2rtc/cmd/webrtc"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/streamer"
+	"github.com/AlexxIT/go2rtc/pkg/webtorrent"
+	"github.com/rs/zerolog"
+	"net/http"
+	"net/url"
+)
+
+func Init() {
+	var cfg struct {
+		Mod struct {
+			Trackers []string `yaml:"trackers"`
+			Shares   map[string]struct {
+				Pwd string `yaml:"pwd"`
+				Src string `yaml:"src"`
+			} `yaml:"shares"`
+		} `yaml:"webtorrent"`
+	}
+
+	cfg.Mod.Trackers = []string{"wss://tracker.openwebtorrent.com"}
+
+	app.LoadConfig(&cfg)
+
+	if len(cfg.Mod.Trackers) == 0 {
+		return
+	}
+
+	log = app.GetLogger("webtorrent")
+
+	streams.HandleFunc("webtorrent", streamHandle)
+
+	api.HandleFunc("api/webtorrent", apiHandle)
+
+	srv = &webtorrent.Server{
+		URL: cfg.Mod.Trackers[0],
+		Exchange: func(src, offer string) (answer string, err error) {
+			stream := streams.Get(src)
+			if stream == nil {
+				return "", errors.New(api.StreamNotFound)
+			}
+			return webrtc.ExchangeSDP(stream, offer, "webtorrent")
+		},
+	}
+
+	if log.Debug().Enabled() {
+		srv.Listen(func(msg interface{}) {
+			switch msg.(type) {
+			case string:
+				log.Debug().Msgf("[webtorrent] %s", msg)
+			case *webtorrent.Message:
+				log.Trace().Any("msg", msg).Msgf("[webtorrent]")
+			}
+		})
+	}
+
+	for name, share := range cfg.Mod.Shares {
+		if len(name) < 8 {
+			log.Warn().Str("name", name).Msgf("min share name len - 8 symbols")
+			continue
+		}
+		if len(share.Pwd) < 4 {
+			log.Warn().Str("name", name).Str("pwd", share.Pwd).Msgf("min share pwd len - 4 symbols")
+			continue
+		}
+		if streams.Get(share.Src) == nil {
+			log.Warn().Str("stream", share.Src).Msgf("stream not exists")
+			continue
+		}
+
+		srv.AddShare(name, share.Pwd, share.Src)
+	}
+}
+
+var log zerolog.Logger
+
+var shares map[string]string
+var srv *webtorrent.Server
+
+func apiHandle(w http.ResponseWriter, r *http.Request) {
+	src := r.URL.Query().Get("src")
+	share, ok := shares[src]
+
+	switch r.Method {
+	case "GET":
+		// support act as WebTorrent tracker (for testing purposes)
+		if r.Header.Get("Connection") == "Upgrade" {
+			tracker(w, r)
+			return
+		}
+
+		if ok {
+			pwd := srv.GetSharePwd(share)
+			data := fmt.Sprintf(`{"share":%q,"pwd":%q}`, share, pwd)
+			_, _ = w.Write([]byte(data))
+		} else {
+			http.Error(w, "", http.StatusNotFound)
+		}
+
+	case "POST":
+		// check if share already exist
+		if ok {
+			http.Error(w, "", http.StatusBadRequest)
+			return
+		}
+
+		// check if stream exists
+		if stream := streams.Get(src); stream == nil {
+			http.Error(w, "", http.StatusNotFound)
+			return
+		}
+
+		// create new random share
+		share = core.RandString(16)
+		pwd := core.RandString(16)
+		srv.AddShare(share, pwd, src)
+
+		if shares == nil {
+			shares = map[string]string{}
+		}
+		shares[src] = share
+
+		w.WriteHeader(http.StatusCreated)
+		data := fmt.Sprintf(`{"share":%q,"pwd":%q}`, share, pwd)
+		_, _ = w.Write([]byte(data))
+
+	case "DELETE":
+		if ok {
+			srv.RemoveShare(share)
+			delete(shares, src)
+		} else {
+			http.Error(w, "", http.StatusNotFound)
+		}
+	}
+}
+
+func streamHandle(rawURL string) (streamer.Producer, error) {
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return nil, err
+	}
+
+	query := u.Query()
+	share := query.Get("share")
+	pwd := query.Get("pwd")
+	if len(share) < 8 || len(pwd) < 4 {
+		return nil, errors.New("wrong URL: " + rawURL)
+	}
+
+	pc, err := webrtc.PeerConnection(true)
+	if err != nil {
+		return nil, err
+	}
+
+	return webtorrent.NewClient(srv.URL, share, pwd, pc)
+}

cmd/webtorrent/tracker.go

@@ -0,0 +1,107 @@
+package webtorrent
+
+import (
+	"fmt"
+	"github.com/AlexxIT/go2rtc/pkg/webtorrent"
+	"github.com/gorilla/websocket"
+	"net/http"
+)
+
+var upgrader *websocket.Upgrader
+var hashes map[string]map[string]*websocket.Conn
+
+func tracker(w http.ResponseWriter, r *http.Request) {
+	if upgrader == nil {
+		upgrader = &websocket.Upgrader{
+			ReadBufferSize:  1024,
+			WriteBufferSize: 2028,
+		}
+		upgrader.CheckOrigin = func(r *http.Request) bool {
+			return true
+		}
+	}
+
+	ws, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Warn().Err(err).Send()
+		return
+	}
+
+	defer ws.Close()
+
+	for {
+		var msg webtorrent.Message
+		if err = ws.ReadJSON(&msg); err != nil {
+			return
+		}
+
+		//log.Trace().Msgf("[webtorrent] message=%v", msg)
+
+		if msg.InfoHash == "" || msg.PeerId == "" {
+			continue
+		}
+
+		if hashes == nil {
+			hashes = map[string]map[string]*websocket.Conn{}
+		}
+
+		// new or old client with offers
+		clients := hashes[msg.InfoHash]
+		if clients == nil {
+			clients = map[string]*websocket.Conn{
+				msg.PeerId: ws,
+			}
+			hashes[msg.InfoHash] = clients
+		} else {
+			clients[msg.PeerId] = ws
+		}
+
+		switch {
+		case msg.Offers != nil:
+			// ask for ping
+			raw := fmt.Sprintf(
+				`{"action":"announce","interval":120,"info_hash":"%s","complete":0,"incomplete":1}`,
+				msg.InfoHash,
+			)
+			if err = ws.WriteMessage(websocket.TextMessage, []byte(raw)); err != nil {
+				log.Warn().Err(err).Send()
+				return
+			}
+
+			// skip if no offers (server)
+			if len(msg.Offers) == 0 {
+				continue
+			}
+
+			// get and check only first offer
+			offer := msg.Offers[0]
+			if offer.OfferId == "" || offer.Offer.Type != "offer" || offer.Offer.SDP == "" {
+				continue
+			}
+
+			// send offer to all clients (one of them - server)
+			raw = fmt.Sprintf(
+				`{"action":"announce","info_hash":"%s","peer_id":"%s","offer_id":"%s","offer":{"type":"offer","sdp":"%s"}}`,
+				msg.InfoHash, msg.PeerId, offer.OfferId, offer.Offer.SDP,
+			)
+
+			for _, server := range clients {
+				if server != ws {
+					_ = server.WriteMessage(websocket.TextMessage, []byte(raw))
+				}
+			}
+
+		case msg.OfferId != "" && msg.ToPeerId != "" && msg.Answer != nil:
+			ws1, ok := clients[msg.ToPeerId]
+			if !ok {
+				continue
+			}
+
+			raw := fmt.Sprintf(
+				`{"action":"announce","info_hash":"%s","peer_id":"%s","offer_id":"%s","answer":{"type":"answer","sdp":"%s"}}`,
+				msg.InfoHash, msg.PeerId, msg.OfferId, msg.Answer.SDP,
+			)
+			_ = ws1.WriteMessage(websocket.TextMessage, []byte(raw))
+		}
+	}
+}

main.go

@@ -24,6 +24,7 @@ import (
 	"github.com/AlexxIT/go2rtc/cmd/streams"
 	"github.com/AlexxIT/go2rtc/cmd/tapo"
 	"github.com/AlexxIT/go2rtc/cmd/webrtc"
+	"github.com/AlexxIT/go2rtc/cmd/webtorrent"
 	"os"
 	"os/signal"
 	"syscall"
@@ -55,6 +56,7 @@ func main() {
 	hls.Init()
 	mjpeg.Init()
 
+	webtorrent.Init()
 	ngrok.Init()
 	debug.Init()
 

pkg/core/helpers.go

@@ -1,71 +1,19 @@
 package core
 
 import (
-	"sync"
+	cryptorand "crypto/rand"
 )
 
-// Waiter support:
-// - autotart on first Wait
-// - block new waiters after last Done
-// - safe Done after finish
-type Waiter struct {
-	sync.WaitGroup
-	mu    sync.Mutex
-	state int // state < 0 means finish
-}
+const digits = "0123456789abcdefghijklmnopqrstuvwxyz"
+const maxSize = byte(len(digits))
 
-func (w *Waiter) Add(delta int) {
-	w.mu.Lock()
-	if w.state >= 0 {
-		w.state += delta
-		w.WaitGroup.Add(delta)
+func RandString(size byte) string {
+	b := make([]byte, size)
+	if _, err := cryptorand.Read(b); err != nil {
+		panic(err)
 	}
-	w.mu.Unlock()
-}
-
-func (w *Waiter) Wait() {
-	w.mu.Lock()
-	// first wait auto start waiter
-	if w.state == 0 {
-		w.state++
-		w.WaitGroup.Add(1)
+	for i := byte(0); i < size; i++ {
+		b[i] = digits[b[i]%maxSize]
 	}
-	w.mu.Unlock()
-
-	w.WaitGroup.Wait()
-}
-
-func (w *Waiter) Done() {
-	w.mu.Lock()
-
-	// safe run Done only when have tasks
-	if w.state > 0 {
-		w.state--
-		w.WaitGroup.Done()
-	}
-
-	// block waiter for any operations after last done
-	if w.state == 0 {
-		w.state = -1
-	}
-
-	w.mu.Unlock()
-}
-
-func (w *Waiter) WaitChan() <-chan struct{} {
-	var ch chan struct{}
-
-	w.mu.Lock()
-
-	if w.state >= 0 {
-		ch = make(chan struct{})
-		go func() {
-			w.Wait()
-			ch <- struct{}{}
-		}()
-	}
-
-	w.mu.Unlock()
-
-	return ch
+	return string(b)
 }

pkg/core/waiter.go

@@ -0,0 +1,71 @@
+package core
+
+import (
+	"sync"
+)
+
+// Waiter support:
+// - autotart on first Wait
+// - block new waiters after last Done
+// - safe Done after finish
+type Waiter struct {
+	sync.WaitGroup
+	mu    sync.Mutex
+	state int // state < 0 means finish
+}
+
+func (w *Waiter) Add(delta int) {
+	w.mu.Lock()
+	if w.state >= 0 {
+		w.state += delta
+		w.WaitGroup.Add(delta)
+	}
+	w.mu.Unlock()
+}
+
+func (w *Waiter) Wait() {
+	w.mu.Lock()
+	// first wait auto start waiter
+	if w.state == 0 {
+		w.state++
+		w.WaitGroup.Add(1)
+	}
+	w.mu.Unlock()
+
+	w.WaitGroup.Wait()
+}
+
+func (w *Waiter) Done() {
+	w.mu.Lock()
+
+	// safe run Done only when have tasks
+	if w.state > 0 {
+		w.state--
+		w.WaitGroup.Done()
+	}
+
+	// block waiter for any operations after last done
+	if w.state == 0 {
+		w.state = -1
+	}
+
+	w.mu.Unlock()
+}
+
+func (w *Waiter) WaitChan() <-chan struct{} {
+	var ch chan struct{}
+
+	w.mu.Lock()
+
+	if w.state >= 0 {
+		ch = make(chan struct{})
+		go func() {
+			w.Wait()
+			ch <- struct{}{}
+		}()
+	}
+
+	w.mu.Unlock()
+
+	return ch
+}

pkg/core/worker.go

@@ -0,0 +1,52 @@
+package core
+
+import (
+	"time"
+)
+
+type Worker struct {
+	timer *time.Timer
+	done  chan struct{}
+}
+
+// NewWorker run f after d
+func NewWorker(d time.Duration, f func() time.Duration) *Worker {
+	timer := time.NewTimer(d)
+	done := make(chan struct{})
+
+	go func() {
+		for {
+			select {
+			case <-timer.C:
+				if d = f(); d > 0 {
+					timer.Reset(d)
+					continue
+				}
+			case <-done:
+				timer.Stop()
+			}
+			break
+		}
+	}()
+
+	return &Worker{timer: timer, done: done}
+}
+
+// Do - instant timer run
+func (w *Worker) Do() {
+	if w == nil {
+		return
+	}
+	w.timer.Reset(0)
+}
+
+func (w *Worker) Stop() {
+	if w == nil {
+		return
+	}
+
+	select {
+	case w.done <- struct{}{}:
+	default:
+	}
+}

pkg/webtorrent/client.go

@@ -0,0 +1,91 @@
+package webtorrent
+
+import (
+	"encoding/base64"
+	"fmt"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/streamer"
+	"github.com/AlexxIT/go2rtc/pkg/webrtc"
+	"github.com/gorilla/websocket"
+	pion "github.com/pion/webrtc/v3"
+	"strconv"
+	"time"
+)
+
+func NewClient(tracker, share, pwd string, pc *pion.PeerConnection) (*webrtc.Conn, error) {
+	// 1. Create WebRTC producer
+	prod := webrtc.NewConn(pc)
+
+	medias := []*streamer.Media{
+		{Kind: streamer.KindVideo, Direction: streamer.DirectionRecvonly},
+		{Kind: streamer.KindAudio, Direction: streamer.DirectionRecvonly},
+	}
+
+	// 2. Create offer
+	offer, err := prod.CreateCompleteOffer(medias)
+	if err != nil {
+		return nil, err
+	}
+
+	// 3. Encrypt offer
+	nonce := strconv.FormatInt(time.Now().UnixNano(), 36)
+
+	cipher, err := NewCipher(share, pwd, nonce)
+	if err != nil {
+		return nil, err
+	}
+
+	enc := cipher.Encrypt([]byte(offer))
+
+	// 4. Connect to Tracker
+	ws, _, err := websocket.DefaultDialer.Dial(tracker, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	defer ws.Close()
+
+	// 5. Send offer
+	msg := fmt.Sprintf(
+		`{"action":"announce","info_hash":"%s","peer_id":"%s","offers":[{"offer_id":"%s","offer":{"type":"offer","sdp":"%s"}}],"numwant":1}`,
+		InfoHash(share), core.RandString(16), nonce, base64.StdEncoding.EncodeToString(enc),
+	)
+	if err = ws.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
+		return nil, err
+	}
+
+	// wait 30 seconds until full answer
+	if err = ws.SetReadDeadline(time.Now().Add(time.Second * 30)); err != nil {
+		return nil, err
+	}
+
+	for {
+		// 6. Read answer
+		var v Message
+		if err = ws.ReadJSON(&v); err != nil {
+			return nil, err
+		}
+
+		if v.Answer == nil {
+			continue
+		}
+
+		// 7. Decrypt answer
+		enc, err = base64.StdEncoding.DecodeString(v.Answer.SDP)
+		if err != nil {
+			return nil, err
+		}
+
+		answer, err := cipher.Decrypt(enc)
+		if err != nil {
+			return nil, err
+		}
+
+		// 8. Set answer
+		if err = prod.SetAnswer(string(answer)); err != nil {
+			return nil, err
+		}
+
+		return prod, nil
+	}
+}

pkg/webtorrent/crypto.go

@@ -0,0 +1,72 @@
+package webtorrent
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"strconv"
+	"time"
+)
+
+type Cipher struct {
+	gcm   cipher.AEAD
+	iv    []byte
+	nonce []byte
+}
+
+func NewCipher(share, pwd, nonce string) (*Cipher, error) {
+	timestamp, err := strconv.ParseInt(nonce, 36, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	delta := time.Duration(time.Now().UnixNano() - timestamp)
+	if delta < 0 {
+		delta = -delta
+	}
+
+	// protect from replay attack, but respect wrong timezone on server
+	if delta > 12*time.Hour {
+		return nil, fmt.Errorf("wrong timedelta %s", delta)
+	}
+
+	c := &Cipher{}
+
+	hash := sha256.New()
+	hash.Write([]byte(nonce + ":" + pwd))
+	key := hash.Sum(nil)
+
+	hash.Reset()
+	hash.Write([]byte(share + ":" + nonce))
+	c.iv = hash.Sum(nil)[:12]
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	c.gcm, err = cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	c.nonce = []byte(nonce)
+
+	return c, nil
+}
+
+func (c *Cipher) Decrypt(ciphertext []byte) ([]byte, error) {
+	return c.gcm.Open(nil, c.iv, ciphertext, c.nonce)
+}
+
+func (c *Cipher) Encrypt(plaintext []byte) []byte {
+	return c.gcm.Seal(nil, c.iv, plaintext, c.nonce)
+}
+
+func InfoHash(share string) string {
+	hash := sha256.New()
+	hash.Write([]byte(share))
+	sum := hash.Sum(nil)
+	return base64.StdEncoding.EncodeToString(sum)
+}

pkg/webtorrent/server.go

@@ -0,0 +1,222 @@
+package webtorrent
+
+import (
+	"encoding/base64"
+	"fmt"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/streamer"
+	"github.com/gorilla/websocket"
+	"sync"
+	"time"
+)
+
+type Server struct {
+	streamer.Element
+
+	URL      string
+	Exchange func(src, offer string) (answer string, err error)
+
+	shares   map[string]*Share
+	mu       sync.Mutex
+	announce *core.Worker
+}
+
+type Share struct {
+	name string
+	pwd  string
+	src  string
+}
+
+func (s *Server) AddShare(name, pwd, src string) {
+	s.mu.Lock()
+
+	if s.shares == nil {
+		s.shares = map[string]*Share{}
+	}
+
+	if len(s.shares) == 0 {
+		go s.Serve()
+	}
+
+	hash := InfoHash(name)
+	s.shares[hash] = &Share{
+		name: name,
+		pwd:  pwd,
+		src:  src,
+	}
+
+	s.announce.Do()
+
+	s.mu.Unlock()
+}
+
+func (s *Server) GetSharePwd(name string) (pwd string) {
+	hash := InfoHash(name)
+	s.mu.Lock()
+	if share, ok := s.shares[hash]; ok {
+		pwd = share.pwd
+	}
+	s.mu.Unlock()
+	return
+}
+
+func (s *Server) RemoveShare(name string) {
+	hash := InfoHash(name)
+	s.mu.Lock()
+	if _, ok := s.shares[hash]; ok {
+		delete(s.shares, hash)
+	}
+	s.mu.Unlock()
+}
+
+// Serve - run reconnection loop, will exit on??
+func (s *Server) Serve() error {
+	for s.HasShares() {
+		s.Fire("connect to tracker: " + s.URL)
+
+		ws, _, err := websocket.DefaultDialer.Dial(s.URL, nil)
+		if err != nil {
+			s.Fire(err)
+			time.Sleep(time.Minute)
+			continue
+		}
+
+		peerID := core.RandString(16)
+
+		// instant run announce worker
+		s.announce = core.NewWorker(0, func() time.Duration {
+			if err = s.writer(ws, peerID); err != nil {
+				return 0
+			}
+			return time.Minute
+		})
+
+		// run reader forewer
+		for {
+			if err = s.reader(ws, peerID); err != nil {
+				break
+			}
+		}
+
+		// stop announcing worker
+		s.announce.Stop()
+
+		// ensure ws is stopped
+		_ = ws.Close()
+
+		time.Sleep(time.Minute)
+	}
+
+	s.Fire("disconnect")
+
+	return nil
+}
+
+// reader - receive offers in the loop, will exit on ws.Close
+func (s *Server) reader(ws *websocket.Conn, peerID string) error {
+	var v Message
+	if err := ws.ReadJSON(&v); err != nil {
+		return err
+	}
+
+	s.Fire(&v)
+
+	s.mu.Lock()
+	share, ok := s.shares[v.InfoHash]
+	s.mu.Unlock()
+
+	// skip any unknown shares
+	if !ok || v.OfferId == "" || v.Offer == nil {
+		return nil
+	}
+
+	cipher, err := NewCipher(share.name, share.pwd, v.OfferId)
+	if err != nil {
+		return nil
+	}
+
+	enc, err := base64.StdEncoding.DecodeString(v.Offer.SDP)
+	if err != nil {
+		return nil
+	}
+
+	offer, err := cipher.Decrypt(enc)
+	if err != nil {
+		return nil
+	}
+
+	answer, err := s.Exchange(share.src, string(offer))
+	if err != nil {
+		return nil
+	}
+
+	enc = cipher.Encrypt([]byte(answer))
+
+	raw := fmt.Sprintf(
+		`{"action":"announce","info_hash":"%s","peer_id":"%s","offer_id":"%s","answer":{"type":"answer","sdp":"%s"},"to_peer_id":"%s"}`,
+		v.InfoHash, peerID, v.OfferId, base64.StdEncoding.EncodeToString(enc), v.PeerId,
+	)
+	return ws.WriteMessage(websocket.TextMessage, []byte(raw))
+}
+
+func (s *Server) writer(ws *websocket.Conn, peerID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if len(s.shares) == 0 {
+		return ws.Close()
+	}
+
+	for hash := range s.shares {
+		msg := fmt.Sprintf(
+			`{"action":"announce","info_hash":"%s","peer_id":"%s","offers":[],"numwant":10}`,
+			hash, peerID,
+		)
+		if err := ws.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *Server) HasShares() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return len(s.shares) > 0
+}
+
+type Message struct {
+	Action   string `json:"action"`
+	InfoHash string `json:"info_hash"`
+
+	// Announce msg
+	Numwant int    `json:"numwant,omitempty"`
+	PeerId  string `json:"peer_id,omitempty"`
+	Offers  []struct {
+		OfferId string `json:"offer_id"`
+		Offer   struct {
+			Type string `json:"type"`
+			SDP  string `json:"sdp"`
+		} `json:"offer"`
+	} `json:"offers,omitempty"`
+
+	// Interval msg
+	Interval   int `json:"interval,omitempty"`
+	Complete   int `json:"complete,omitempty"`
+	Incomplete int `json:"incomplete,omitempty"`
+
+	// Offer msg
+	OfferId string `json:"offer_id,omitempty"`
+	Offer   *struct {
+		Type string `json:"type"`
+		SDP  string `json:"sdp"`
+	} `json:"offer,omitempty"`
+
+	// Answer msg
+	ToPeerId string `json:"to_peer_id,omitempty"`
+	Answer   *struct {
+		Type string `json:"type"`
+		SDP  string `json:"sdp"`
+	} `json:"answer,omitempty"`
+}

www/links.html

@@ -16,7 +16,7 @@
             flex-direction: column;
         }
 
-        html, body, #config {
+        html, body {
             width: 100%;
             height: 100%;
         }
@@ -41,43 +41,26 @@
 <body>
 <script src="main.js"></script>
 <div id="links"></div>
-<div id="audio">
-    <h2>Play audio</h2>
-    <input id="source" type="text" placeholder="source">
-    <a id="send" href="#">send</a> / cameras with two way audio support
-</div>
 <script>
-    const params = new URLSearchParams(location.search);
-    const src = params.get("src");
+    const src = new URLSearchParams(location.search).get('src')
 
-    document.querySelector("#send")
-        .addEventListener("click", () => {
-            const source = document.querySelector("#source");
-            const url = new URL("api/streams", location.href);
-            url.searchParams.set("dst", src);
-            url.searchParams.set("src", source.value);
-            fetch(url, {method: "POST"});
-        });
-
-    const links = document.querySelector("#links");
-    links.innerHTML = `
+    document.getElementById('links').innerHTML = `
         <h2>Any codec in source</h2>
         <li><a href="stream.html?src=${src}">stream.html</a> with auto-select mode / browsers: all / codecs: H264, H265*, MJPEG, JPEG, AAC, PCMU, PCMA, OPUS</li>
         <li><a href="api/streams?src=${src}">info.json</a> page with active connections</li>
-    `;
+    `
 
-    const url = new URL('api', location.href);
+    const url = new URL('api', location.href)
     fetch(url, {cache: 'no-cache'}).then(r => r.json()).then(data => {
-        let rtsp = location.host + ':8554';
+        let rtsp = location.host + ':8554'
         try {
-            const host = data.host.match(/^[^:]+/)[0];
-            const port = data.rtsp.listen.match(/[0-9]+$/)[0];
-            rtsp = `${host}:${port}`;
+            const host = data.host.match(/^[^:]+/)[0]
+            const port = data.rtsp.listen.match(/[0-9]+$/)[0]
+            rtsp = `${host}:${port}`
         } catch (e) {
         }
 
-        const links = document.querySelector("#links");
-        links.innerHTML += `
+        document.getElementById('links').innerHTML += `
             <li><a href="rtsp://${rtsp}/${src}">rtsp</a> with only one video and one audio / codecs: any</li>
             <li><a href="rtsp://${rtsp}/${src}?mp4">rtsp</a> for MP4 recording (Hass or Frigate) / codecs: H264, H265, AAC</li>
             <li><a href="rtsp://${rtsp}/${src}?video=all&audio=all">rtsp</a> with all tracks / codecs: any</li>
@@ -96,8 +79,71 @@
             <li><a href="stream.html?src=${src}&mode=mjpeg">stream.html</a> with MJPEG mode / browsers: all / codecs: MJPEG, JPEG</li>
             <li><a href="api/stream.mjpeg?src=${src}">stream.mjpeg</a> MJPEG stream / browsers: all / codecs: MJPEG, JPEG</li>
             <li><a href="api/frame.jpeg?src=${src}">frame.jpeg</a> snapshot in JPEG-format / browsers: all / codecs: MJPEG, JPEG</li>
-        `;
-    });
+        `
+    })
 </script>
+
+<div>
+    <h2>Play audio</h2>
+    <input id="source" type="text" placeholder="source">
+    <a id="send" href="#">send</a> / cameras with two way audio support
+</div>
+<script>
+    document.getElementById('send').addEventListener('click', ev => {
+        ev.preventDefault()
+        const url = new URL('api/streams', location.href)
+        url.searchParams.set('dst', src)
+        url.searchParams.set('src', document.getElementById('source').value)
+        fetch(url, {method: 'POST'})
+    })
+</script>
+
+<div>
+    <h2>Share stream</h2>
+    <a id="shareadd" href="#">share</a>
+    <a id="shareget" href="#">copy link</a>
+    <a id="sharedel" href="#">delete</a>
+</div>
+<script>
+    function share(method) {
+        const url = new URL('api/webtorrent', location.href)
+        url.searchParams.set('src', src)
+        return fetch(url, {method: method, cache: 'no-cache'})
+    }
+
+    function onshareadd(r) {
+        document.getElementById('shareadd').style.display = 'none'
+        document.getElementById('shareget').style.display = ''
+        document.getElementById('sharedel').style.display = ''
+        document.getElementById('shareget').href = `https://alexxit.github.io/go2rtc/#share=${r.share}&pwd=${r.pwd}`
+    }
+
+    function onsharedel() {
+        document.getElementById('shareadd').style.display = ''
+        document.getElementById('shareget').style.display = 'none'
+        document.getElementById('sharedel').style.display = 'none'
+    }
+
+    document.getElementById('shareadd').addEventListener('click', ev => {
+        ev.preventDefault()
+        share('POST').then(r => r.json()).then(r => onshareadd(r))
+    })
+
+    document.getElementById('shareget').addEventListener('click', ev => {
+        ev.preventDefault()
+        navigator.clipboard.writeText(ev.target.href)
+    })
+
+    document.getElementById('sharedel').addEventListener('click', ev => {
+        ev.preventDefault()
+        share('DELETE').then(r => onsharedel())
+    })
+
+    share('GET').then(r => {
+        if (r.ok) r.json().then(r => onshareadd(r))
+        else onsharedel()
+    })
+</script>
+
 </body>
 </html>