Restructure offers.

static/sfu.js

@@ -646,7 +646,7 @@ function serverConnect() {
             let m = JSON.parse(e.data);
             switch(m.type) {
             case 'offer':
-                gotOffer(m.id, m.labels, m.offer, !!m.renegotiate);
+                gotOffer(m.id, m.labels, m.offer, m.kind === 'renegotiate');
                 break;
             case 'answer':
                 gotAnswer(m.id, m.answer);
@@ -1276,10 +1276,10 @@ async function negotiate(id, restartIce) {
 
     send({
         type: 'offer',
+        kind: 'renegotiate',
         id: id,
         labels: c.labelsByMid,
         offer: offer,
-        renegotiate: true,
     });
 }
 

webclient.go

@@ -173,17 +173,16 @@ func (v rateMap) MarshalJSON() ([]byte, error) {
 
 type clientMessage struct {
 	Type        string                     `json:"type"`
+	Kind        string                     `json:"kind,omitempty"`
 	Id          string                     `json:"id,omitempty"`
 	Username    string                     `json:"username,omitempty"`
 	Password    string                     `json:"password,omitempty"`
 	Permissions clientPermission           `json:"permissions,omitempty"`
 	Group       string                     `json:"group,omitempty"`
 	Value       string                     `json:"value,omitempty"`
-	Kind        string                     `json:"kind,omitempty"`
 	Offer       *webrtc.SessionDescription `json:"offer,omitempty"`
 	Answer      *webrtc.SessionDescription `json:"answer,omitempty"`
 	Candidate   *webrtc.ICECandidateInit   `json:"candidate,omitempty"`
-	Renegotiate bool                       `json:"renegotiate,omitempty"`
 	Labels      map[string]string          `json:"labels,omitempty"`
 	Request     rateMap                    `json:"request,omitempty"`
 }
@@ -431,11 +430,16 @@ func negotiate(c *webClient, down *rtpDownConnection, renegotiate, restartIce bo
 		}
 	}
 
+	kind := ""
+	if renegotiate {
+		kind = "renegotiate"
+	}
+
 	return c.write(clientMessage{
 		Type:   "offer",
+		Kind:   kind,
 		Id:     down.id,
 		Offer:  &offer,
-		Renegotiate: renegotiate,
 		Labels: labels,
 	})
 }
@@ -964,7 +968,9 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 		if m.Offer == nil {
 			return protocolError("null offer")
 		}
-		err := gotOffer(c, m.Id, *m.Offer, m.Renegotiate, m.Labels)
+		err := gotOffer(
+			c, m.Id, *m.Offer, m.Kind == "renegotiate", m.Labels,
+		)
 		if err != nil {
 			log.Printf("gotOffer: %v", err)
 			return failConnection(c, m.Id, "negotiation failed")