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WIP: WHIP support

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This commit is contained in:
Juliusz Chroboczek 2021-09-09 16:24:14 +02:00
parent ea7142ca9a
commit 7c2bc04359
5 changed files with 509 additions and 42 deletions
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3
galene.go
View file

@ -19,6 +19,7 @@ import (
"github.com/jech/galene/token"
"github.com/jech/galene/turnserver"
"github.com/jech/galene/webserver"
"github.com/jech/galene/whip"
)
func main() {
@ -49,6 +50,8 @@ func main() {
"require use of TURN relays for all media traffic")
flag.StringVar(&turnserver.Address, "turn", "auto",
"built-in TURN server `address` (\"\" to disable)")
flag.BoolVar(&whip.PublicServer, "public-server", false,
"allow browser access from arbitrary origins")
flag.Parse()
if udpRange != "" {

64
rtpconn/rtpconn.go
View file

@ -397,7 +397,7 @@ func (down *rtpDownConnection) flushICECandidates() error {
type rtpUpTrack struct {
track *webrtc.TrackRemote
receiver *webrtc.RTPReceiver
conn *rtpUpConnection
conn *UpConn
rate *estimator.Estimator
cache *packetcache.Cache
jitter *jitter.Estimator
@ -510,11 +510,11 @@ func (up *rtpUpTrack) hasRtcpFb(tpe, parameter string) bool {
return false
}
type rtpUpConnection struct {
type UpConn struct {
id string
client group.Client
label string
pc *webrtc.PeerConnection
PC *webrtc.PeerConnection
iceCandidates []*webrtc.ICECandidateInit
mu sync.Mutex
@ -525,7 +525,7 @@ type rtpUpConnection struct {
local []conn.Down
}
func (up *rtpUpConnection) getTracks() []*rtpUpTrack {
func (up *UpConn) getTracks() []*rtpUpTrack {
up.mu.Lock()
defer up.mu.Unlock()
tracks := make([]*rtpUpTrack, len(up.tracks))
@ -533,7 +533,7 @@ func (up *rtpUpConnection) getTracks() []*rtpUpTrack {
return tracks
}
func (up *rtpUpConnection) getReplace(reset bool) string {
func (up *UpConn) getReplace(reset bool) string {
up.mu.Lock()
defer up.mu.Unlock()
replace := up.replace
@ -543,19 +543,19 @@ func (up *rtpUpConnection) getReplace(reset bool) string {
return replace
}
func (up *rtpUpConnection) Id() string {
func (up *UpConn) Id() string {
return up.id
}
func (up *rtpUpConnection) Label() string {
func (up *UpConn) Label() string {
return up.label
}
func (up *rtpUpConnection) User() (string, string) {
func (up *UpConn) User() (string, string) {
return up.client.Id(), up.client.Username()
}
func (up *rtpUpConnection) AddLocal(local conn.Down) error {
func (up *UpConn) AddLocal(local conn.Down) error {
up.mu.Lock()
defer up.mu.Unlock()
// the connection may have been closed in the meantime, in which
@ -572,7 +572,7 @@ func (up *rtpUpConnection) AddLocal(local conn.Down) error {
return nil
}
func (up *rtpUpConnection) DelLocal(local conn.Down) bool {
func (up *UpConn) DelLocal(local conn.Down) bool {
up.mu.Lock()
defer up.mu.Unlock()
for i, l := range up.local {
@ -584,7 +584,7 @@ func (up *rtpUpConnection) DelLocal(local conn.Down) bool {
return false
}
func (up *rtpUpConnection) getLocal() []conn.Down {
func (up *UpConn) getLocal() []conn.Down {
up.mu.Lock()
defer up.mu.Unlock()
local := make([]conn.Down, len(up.local))
@ -592,22 +592,22 @@ func (up *rtpUpConnection) getLocal() []conn.Down {
return local
}
func (up *rtpUpConnection) addICECandidate(candidate *webrtc.ICECandidateInit) error {
if up.pc.RemoteDescription() != nil {
return up.pc.AddICECandidate(*candidate)
func (up *UpConn) addICECandidate(candidate *webrtc.ICECandidateInit) error {
if up.PC.RemoteDescription() != nil {
return up.PC.AddICECandidate(*candidate)
}
up.iceCandidates = append(up.iceCandidates, candidate)
return nil
}
func (up *rtpUpConnection) flushICECandidates() error {
err := flushICECandidates(up.pc, up.iceCandidates)
func (up *UpConn) flushICECandidates() error {
err := flushICECandidates(up.PC, up.iceCandidates)
up.iceCandidates = nil
return err
}
// pushConnNow pushes a connection to all of the clients in a group
func pushConnNow(up *rtpUpConnection, g *group.Group, cs []group.Client) {
func pushConnNow(up *UpConn, g *group.Group, cs []group.Client) {
up.mu.Lock()
up.pushed = true
replace := up.replace
@ -623,8 +623,18 @@ func pushConnNow(up *rtpUpConnection, g *group.Group, cs []group.Client) {
}
}
func (up *UpConn) GetTracks() []conn.UpTrack {
up.mu.Lock()
defer up.mu.Unlock()
ts := make([]conn.UpTrack, len(up.tracks))
for i, t := range up.tracks {
ts[i] = t
}
return ts
}
// pushConn schedules a call to pushConnNow
func pushConn(up *rtpUpConnection, g *group.Group, cs []group.Client) {
func pushConn(up *UpConn, g *group.Group, cs []group.Client) {
up.mu.Lock()
up.pushed = false
up.mu.Unlock()
@ -641,7 +651,7 @@ func pushConn(up *rtpUpConnection, g *group.Group, cs []group.Client) {
}(g, cs)
}
func newUpConn(c group.Client, id string, label string, offer string) (*rtpUpConnection, error) {
func NewUpConn(c group.Client, id string, label string, offer string) (*UpConn, error) {
var o sdp.SessionDescription
err := o.Unmarshal([]byte(offer))
if err != nil {
@ -670,7 +680,7 @@ func newUpConn(c group.Client, id string, label string, offer string) (*rtpUpCon
}
}
up := &rtpUpConnection{id: id, client: c, label: label, pc: pc}
up := &UpConn{id: id, client: c, label: label, PC: pc}
pc.OnTrack(func(remote *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
up.mu.Lock()
@ -710,7 +720,7 @@ func (track *rtpUpTrack) sendPLI() error {
if !track.hasRtcpFb("nack", "pli") {
return ErrUnsupportedFeedback
}
return sendPLI(track.conn.pc, track.track.SSRC())
return sendPLI(track.conn.PC, track.track.SSRC())
}
func sendPLI(pc *webrtc.PeerConnection, ssrc webrtc.SSRC) error {
@ -724,7 +734,7 @@ func (track *rtpUpTrack) sendNACK(first uint16, bitmap uint16) error {
return ErrUnsupportedFeedback
}
err := sendNACKs(track.conn.pc, track.track.SSRC(),
err := sendNACKs(track.conn.PC, track.track.SSRC(),
[]rtcp.NackPair{{first, rtcp.PacketBitmap(bitmap)}},
)
if err == nil {
@ -754,7 +764,7 @@ func (track *rtpUpTrack) sendNACKs(seqnos []uint16) error {
f, b, seqnos = packetcache.ToBitmap(seqnos)
nacks = append(nacks, rtcp.NackPair{f, rtcp.PacketBitmap(b)})
}
err := sendNACKs(track.conn.pc, track.track.SSRC(), nacks)
err := sendNACKs(track.conn.PC, track.track.SSRC(), nacks)
if err == nil {
track.cache.Expect(count)
}
@ -937,11 +947,11 @@ func maxUpBitrate(t *rtpUpTrack) uint64 {
return maxrate
}
func sendUpRTCP(up *rtpUpConnection) error {
func sendUpRTCP(up *UpConn) error {
tracks := up.getTracks()
if len(up.tracks) == 0 {
state := up.pc.ConnectionState()
state := up.PC.ConnectionState()
if state == webrtc.PeerConnectionStateClosed {
return io.ErrClosedPipe
}
@ -1022,10 +1032,10 @@ func sendUpRTCP(up *rtpUpConnection) error {
},
)
}
return up.pc.WriteRTCP(packets)
return up.PC.WriteRTCP(packets)
}
func rtcpUpSender(conn *rtpUpConnection) {
func rtcpUpSender(conn *UpConn) {
for {
time.Sleep(time.Second)
err := sendUpRTCP(conn)

30
rtpconn/webclient.go
View file

@ -69,7 +69,7 @@ type webClient struct {
mu sync.Mutex
down map[string]*rtpDownConnection
up map[string]*rtpUpConnection
up map[string]*UpConn
// action may be called with the group mutex taken, and therefore
// actions needs to use its own mutex.
@ -142,7 +142,7 @@ type closeMessage struct {
data []byte
}
func getUpConn(c *webClient, id string) *rtpUpConnection {
func getUpConn(c *webClient, id string) *UpConn {
c.mu.Lock()
defer c.mu.Unlock()
@ -152,22 +152,22 @@ func getUpConn(c *webClient, id string) *rtpUpConnection {
return c.up[id]
}
func getUpConns(c *webClient) []*rtpUpConnection {
func getUpConns(c *webClient) []*UpConn {
c.mu.Lock()
defer c.mu.Unlock()
up := make([]*rtpUpConnection, 0, len(c.up))
up := make([]*UpConn, 0, len(c.up))
for _, u := range c.up {
up = append(up, u)
}
return up
}
func addUpConn(c *webClient, id, label string, offer string) (*rtpUpConnection, bool, error) {
func addUpConn(c *webClient, id, label string, offer string) (*UpConn, bool, error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.up == nil {
c.up = make(map[string]*rtpUpConnection)
c.up = make(map[string]*UpConn)
}
if c.down != nil && c.down[id] != nil {
return nil, false, errors.New("adding duplicate connection")
@ -178,18 +178,18 @@ func addUpConn(c *webClient, id, label string, offer string) (*rtpUpConnection,
return old, false, nil
}
conn, err := newUpConn(c, id, label, offer)
conn, err := NewUpConn(c, id, label, offer)
if err != nil {
return nil, false, err
}
c.up[id] = conn
conn.pc.OnICECandidate(func(candidate *webrtc.ICECandidate) {
conn.PC.OnICECandidate(func(candidate *webrtc.ICECandidate) {
sendICE(c, id, candidate)
})
conn.pc.OnICEConnectionStateChange(func(state webrtc.ICEConnectionState) {
conn.PC.OnICEConnectionStateChange(func(state webrtc.ICEConnectionState) {
if state == webrtc.ICEConnectionStateFailed {
c.action(connectionFailedAction{id: id})
}
@ -231,7 +231,7 @@ func delUpConn(c *webClient, id string, userId string, push bool) error {
conn.closed = true
conn.mu.Unlock()
conn.pc.Close()
conn.PC.Close()
if push && g != nil {
for _, c := range g.GetClients(c) {
@ -586,7 +586,7 @@ func gotOffer(c *webClient, id, label string, sdp string, replace string) error
delUpConn(c, replace, c.Id(), false)
}
err = up.pc.SetRemoteDescription(webrtc.SessionDescription{
err = up.PC.SetRemoteDescription(webrtc.SessionDescription{
Type: webrtc.SDPTypeOffer,
SDP: sdp,
})
@ -594,12 +594,12 @@ func gotOffer(c *webClient, id, label string, sdp string, replace string) error
return err
}
answer, err := up.pc.CreateAnswer(nil)
answer, err := up.PC.CreateAnswer(nil)
if err != nil {
return err
}
err = up.pc.SetLocalDescription(answer)
err = up.PC.SetLocalDescription(answer)
if err != nil {
return err
}
@ -612,7 +612,7 @@ func gotOffer(c *webClient, id, label string, sdp string, replace string) error
return c.write(clientMessage{
Type: "answer",
Id: id,
SDP: up.pc.LocalDescription().SDP,
SDP: up.PC.LocalDescription().SDP,
})
}
@ -724,7 +724,7 @@ func (c *webClient) setRequested(requested map[string][]string) error {
func (c *webClient) setRequestedStream(down *rtpDownConnection, requested []string) error {
var remoteClient group.Client
remote, ok := down.remote.(*rtpUpConnection)
remote, ok := down.remote.(*UpConn)
if ok {
remoteClient = remote.client
}

7
webserver/webserver.go
View file

@ -27,6 +27,7 @@ import (
"github.com/jech/galene/group"
"github.com/jech/galene/rtpconn"
"github.com/jech/galene/stats"
"github.com/jech/galene/whip"
)
var server atomic.Value
@ -38,6 +39,7 @@ var Insecure bool
func Serve(address string, dataDir string) error {
http.Handle("/", &fileHandler{http.Dir(StaticRoot)})
http.HandleFunc("/group/", groupHandler)
http.HandleFunc("/whip/", whip.Handler)
http.HandleFunc("/recordings",
func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r,
@ -333,6 +335,11 @@ func groupHandler(w http.ResponseWriter, r *http.Request) {
return
}
if r.Method == "POST" || r.Method == "OPTIONS" {
whip.Endpoint(g, w, r)
return
}
status := g.Status(false, "")
cspHeader(w, status.AuthServer)
serveFile(w, r, filepath.Join(StaticRoot, "galene.html"))

447
whip/whip.go Normal file
View file

@ -0,0 +1,447 @@
package whip
import (
"bytes"
crand "crypto/rand"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strings"
"sync"
"github.com/jech/galene/conn"
"github.com/jech/galene/group"
"github.com/jech/galene/rtpconn"
"github.com/pion/webrtc/v3"
)
var PublicServer bool
type Client struct {
group *group.Group
id string
username string
mu sync.Mutex
permissions []string
connection *rtpconn.UpConn
}
func (c *Client) Group() *group.Group {
return c.group
}
func (c *Client) Id() string {
return c.id
}
func (c *Client) Username() string {
return c.username
}
func (c *Client) SetUsername(username string) {
c.username = username
}
func (c *Client) Permissions() []string {
c.mu.Lock()
defer c.mu.Unlock()
return c.permissions
}
func (c *Client) SetPermissions(perms []string) {
c.mu.Lock()
defer c.mu.Unlock()
c.permissions = perms
}
func (c *Client) Data() map[string]interface{} {
return nil
}
func (c *Client) Status() map[string]interface{} {
return nil
}
func (c *Client) PushConn(g *group.Group, id string, conn conn.Up, tracks []conn.UpTrack, replace string) error {
return nil
}
func (c *Client) RequestConns(target group.Client, g *group.Group, id string) error {
if g != c.group {
return nil
}
c.mu.Lock()
conn := c.connection
c.mu.Unlock()
if conn == nil {
return nil
}
target.PushConn(g, conn.Id(), conn, conn.GetTracks(), "")
return nil
}
func (c *Client) Joined(group, kind string) error {
return nil
}
func (c *Client) PushClient(group, kind, id, username string, permissions []string, status map[string]interface{}) error {
return nil
}
func (c *Client) Kick(id string, user *string, message string) error {
return c.close()
}
func (c *Client) conn() *rtpconn.UpConn {
c.mu.Lock()
defer c.mu.Unlock()
return c.connection
}
func (c *Client) close() error {
c.mu.Lock()
defer c.mu.Unlock()
g := c.group
if g == nil {
return nil
}
if c.connection != nil {
id := c.connection.Id()
c.connection.PC.OnConnectionStateChange(nil)
c.connection.PC.Close()
c.connection = nil
for _, c := range g.GetClients(c) {
c.PushConn(g, id, nil, nil, "")
}
c.connection = nil
}
group.DelClient(c)
c.group = nil
return nil
}
func newId() string {
b := make([]byte, 16)
crand.Read(b)
return hex.EncodeToString(b)
}
func httpError(w http.ResponseWriter, err error) {
if os.IsNotExist(err) {
http.Error(w, "404 not found", http.StatusNotFound)
return
}
if os.IsPermission(err) {
http.Error(w, "403 forbidden", http.StatusForbidden)
return
}
log.Printf("WHIP: %v", err)
http.Error(w, "500 Internal Server Error",
http.StatusInternalServerError)
return
}
const sdpLimit = 1024 * 1024
func readLimited(r io.Reader) ([]byte, error) {
v, err := ioutil.ReadAll(io.LimitReader(r, sdpLimit))
if len(v) == sdpLimit {
err = errors.New("SDP too large")
}
return v, err
}
func canPresent(perms []string) bool {
for _, p := range perms {
if p == "present" {
return true
}
}
return false
}
func Endpoint(g *group.Group, w http.ResponseWriter, r *http.Request) {
if PublicServer {
w.Header().Set("Access-Control-Allow-Origin", "*")
}
if r.Method == "OPTIONS" {
w.Header().Set("Access-Control-Allow-Methods", "GET, HEAD, POST")
w.Header().Set("Access-Control-Allow-Headers",
"Authorization, Content-Type",
)
return
}
if r.Method != "POST" {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
ctype := r.Header.Get("content-type")
if !strings.EqualFold(ctype, "application/sdp") {
http.Error(w, "bad content type", http.StatusBadRequest)
return
}
body, err := readLimited(r.Body)
if err != nil {
httpError(w, err)
return
}
id := newId()
c := &Client{
group: g,
id: id,
}
username, password, _ := r.BasicAuth()
c.username = username
creds := group.ClientCredentials{
Username: &username,
Password: password,
}
_, err = group.AddClient(g.Name(), c, creds)
if err == group.ErrNotAuthorised ||
err == group.ErrAnonymousNotAuthorised {
w.Header().Set("www-authenticate",
fmt.Sprintf("basic realm=\"%v\"",
path.Join("/whip/", g.Name())))
http.Error(w, "Authentication failed", http.StatusUnauthorized)
return
} else if err != nil {
log.Printf("WHIP: %v", err)
http.Error(w,
"Internal Server Error", http.StatusInternalServerError,
)
return
}
if !canPresent(c.Permissions()) {
http.Error(w, "Not authorised", http.StatusUnauthorized)
return
}
conn, err := rtpconn.NewUpConn(c, id, "", string(body))
if err != nil {
group.DelClient(c)
httpError(w, err)
return
}
conn.PC.OnICEConnectionStateChange(func(state webrtc.ICEConnectionState) {
switch state {
case webrtc.ICEConnectionStateFailed,
webrtc.ICEConnectionStateClosed:
c.close()
}
})
c.mu.Lock()
c.connection = conn
c.mu.Unlock()
sdp, err := gotOffer(conn, body)
if err != nil {
group.DelClient(c)
httpError(w, err)
return
}
w.Header().Set("Location", path.Join("/whip/", path.Join(g.Name(), id)))
w.Header().Set("Access-Control-Expose-Headers", "Location, Content-Type")
w.Header().Set("Content-Type", "application/sdp")
w.WriteHeader(http.StatusCreated)
w.Write(sdp)
return
}
func Handler(w http.ResponseWriter, r *http.Request) {
p := path.Dir(r.URL.Path)
id := path.Base(r.URL.Path)
if p[:6] != "/whip/" {
httpError(w, errors.New("bad URL"))
return
}
name := p[6:]
g := group.Get(name)
if g == nil {
http.Error(w, "404 not found", http.StatusNotFound)
return
}
cc := g.GetClient(id)
if cc == nil {
http.Error(w, "404 not found", http.StatusNotFound)
return
}
c, ok := cc.(*Client)
if !ok {
httpError(w, errors.New("unexpected type for client"))
return
}
if PublicServer {
w.Header().Set("Access-Control-Allow-Origin", "*")
}
if r.Method == "OPTIONS" {
w.Header().Set("Access-Control-Allow-Methods",
"GET, HEAD, PATCH, DELETE",
)
w.Header().Set("Access-Control-Allow-Headers",
"Authorization, Content-Type",
)
return
}
username, password, _ := r.BasicAuth()
if username != c.username {
c.username = username
}
creds := group.ClientCredentials{
Username: &username,
Password: password,
}
user, perms, err := g.GetPermission(creds)
if err == group.ErrNotAuthorised ||
err == group.ErrAnonymousNotAuthorised {
w.Header().Set("www-authenticate",
fmt.Sprintf("basic realm=\"%v\"",
path.Join("/whip/", g.Name())))
http.Error(w, "Authentication failed", http.StatusUnauthorized)
return
} else if err != nil {
log.Printf("WHIP: %v", err)
http.Error(w,
"Internal Server Error", http.StatusInternalServerError,
)
return
}
if user != "" {
c.username = username
}
if !canPresent(perms) {
http.Error(w, "Not authorised", http.StatusUnauthorized)
return
}
if r.Method == "DELETE" {
c.close()
return
}
if r.Method != "PATCH" {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
ctype := r.Header.Get("content-type")
if !strings.EqualFold(ctype, "application/trickle-ice-sdpfrag") {
http.Error(w, "bad content type", http.StatusBadRequest)
return
}
conn := c.conn()
if conn == nil {
http.Error(w, "connection closed", http.StatusNotFound)
return
}
body, err := readLimited(r.Body)
if err != nil {
httpError(w, err)
return
}
if len(body) < 2 {
http.Error(w, "SDP truncated", http.StatusBadRequest)
return
}
if string(body[:2]) == "v=" {
answer, err := gotOffer(conn, body)
if err != nil {
httpError(w, err)
return
}
w.Header().Set("Content-Type", "application/sdp")
w.Write(answer)
return
}
// RFC 8840
lines := bytes.Split(body, []byte{'\n'})
var ufrag []byte
for _, l := range lines {
l = bytes.TrimRight(l, " \r")
if bytes.HasPrefix(l, []byte("a=ice-ufrag:")) {
ufrag = l[len("a=ice-ufrag:"):]
} else if bytes.HasPrefix(l, []byte("a=candidate:")) {
err := gotCandidate(conn, l[2:], ufrag)
if err != nil {
log.Printf("WHIP candidate: %v", err)
}
} else if bytes.Equal(l, []byte("a=end-of-candidates")) {
gotCandidate(conn, nil, ufrag)
}
}
w.WriteHeader(http.StatusNoContent)
return
}
func gotOffer(conn *rtpconn.UpConn, offer []byte) ([]byte, error) {
err := conn.PC.SetRemoteDescription(webrtc.SessionDescription{
Type: webrtc.SDPTypeOffer,
SDP: string(offer),
})
if err != nil {
return nil, err
}
answer, err := conn.PC.CreateAnswer(nil)
if err != nil {
return nil, err
}
gatherComplete := webrtc.GatheringCompletePromise(conn.PC)
err = conn.PC.SetLocalDescription(answer)
if err != nil {
return nil, err
}
<-gatherComplete
return []byte(conn.PC.CurrentLocalDescription().SDP), nil
}
func gotCandidate(conn *rtpconn.UpConn, candidate, ufrag []byte) error {
zero := uint16(0)
init := webrtc.ICECandidateInit{
Candidate: string(candidate),
SDPMLineIndex: &zero,
}
if ufrag != nil {
u := string(ufrag)
init.UsernameFragment = &u
}
err := conn.PC.AddICECandidate(init)
return err
}