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whip.go
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whip.go
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package main
import (
"bytes"
"crypto/tls"
"io"
"log"
"net/http"
"net/url"
"github.com/pion/mediadevices"
"github.com/pion/webrtc/v3"
)
type WHIPClient struct {
endpoint string
token string
resourceUrl string
}
func NewWHIPClient(endpoint string, token string) *WHIPClient {
client := new(WHIPClient)
client.endpoint = endpoint
client.token = token
return client
}
func (whip *WHIPClient) Publish(stream mediadevices.MediaStream, mediaEngine webrtc.MediaEngine, iceServers []webrtc.ICEServer, skipTlsAuth bool) {
config := webrtc.Configuration{
ICEServers: iceServers,
}
settings := webrtc.SettingEngine{}
// settings.SetNetworkTypes([]webrtc.NetworkType{webrtc.NetworkTypeUDP4})
pc, err := webrtc.NewAPI(
webrtc.WithMediaEngine(&mediaEngine),
webrtc.WithSettingEngine(settings),
).NewPeerConnection(config)
if err != nil {
log.Fatal("Unexpected error building the PeerConnection. ", err)
}
for _, track := range stream.GetTracks() {
track.OnEnded(func(err error) {
log.Println("Track ended with error, ", err)
})
_, err = pc.AddTransceiverFromTrack(track,
webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
},
)
if err != nil {
panic(err)
}
}
pc.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
log.Printf("PeerConnection State has changed %s \n", connectionState.String())
})
offer, err := pc.CreateOffer(nil)
if err != nil {
log.Fatal("PeerConnection could not create offer. ", err)
}
err = pc.SetLocalDescription(offer)
if err != nil {
log.Fatal("PeerConnection could not set local offer. ", err)
}
// Block until ICE Gathering is complete, disabling trickle ICE
// we do this because we only can exchange one signaling message
// in a production application you should exchange ICE Candidates via OnICECandidate
gatherComplete := webrtc.GatheringCompletePromise(pc)
<-gatherComplete
// log.Println(pc.LocalDescription().SDP)
var sdp = []byte(pc.LocalDescription().SDP)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: skipTlsAuth,
},
},
}
req, err := http.NewRequest("POST", whip.endpoint, bytes.NewBuffer(sdp))
if err != nil {
log.Fatal("Unexpected error building http request. ", err)
}
req.Header.Add("Content-Type", "application/sdp")
if whip.token != "" {
req.Header.Add("Authorization", "Bearer "+whip.token)
}
resp, err := client.Do(req)
if err != nil {
log.Fatal("Failed http POST request. ", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
// log.Println(string(body))
if resp.StatusCode != 201 {
log.Fatalf("Non Successful POST: %d", resp.StatusCode)
}
resourceUrl, err := url.Parse(resp.Header.Get("Location"))
if err != nil {
log.Fatal("Failed to parse resource url. ", err)
}
base, err := url.Parse(whip.endpoint)
if err != nil {
log.Fatal("Failed to parse base url. ", err)
}
whip.resourceUrl = base.ResolveReference(resourceUrl).String()
answer := webrtc.SessionDescription{}
answer.Type = webrtc.SDPTypeAnswer
answer.SDP = string(body)
err = pc.SetRemoteDescription(answer)
if err != nil {
log.Fatal("PeerConnection could not set remote answer. ", err)
}
}
func (whip *WHIPClient) Close(skipTlsAuth bool) {
req, err := http.NewRequest("DELETE", whip.resourceUrl, nil)
if err != nil {
log.Fatal("Unexpected error building http request. ", err)
}
if whip.token != "" {
req.Header.Add("Authorization", "Bearer "+whip.token)
}
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: skipTlsAuth,
},
},
}
_, err = client.Do(req)
if err != nil {
log.Fatal("Failed http DELETE request. ", err)
}
}