MatrixRTC: Add RTC decline event (#4978)

* Add decline event

Signed-off-by: Timo K <toger5@hotmail.de>

* add `client.sendRtcDecline`.

Signed-off-by: Timo K <toger5@hotmail.de>

* remove `decline.reason` field.

Signed-off-by: Timo K <toger5@hotmail.de>

---------

Signed-off-by: Timo K <toger5@hotmail.de>

src/@types/event.ts

@@ -53,6 +53,7 @@ import {
 } from "../webrtc/callEventTypes.ts";
 import {
     type IRTCNotificationContent,
+    type IRTCDeclineContent,
     type EncryptionKeysEventContent,
     type ICallNotifyContent,
 } from "../matrixrtc/types.ts";
@@ -152,6 +153,7 @@ export enum EventType {
     // MatrixRTC events
     CallNotify = "org.matrix.msc4075.call.notify",
     RTCNotification = "org.matrix.msc4075.rtc.notification",
+    RTCDecline = "org.matrix.msc4310.rtc.decline",
 }
 
 export enum RelationType {
@@ -332,6 +334,7 @@ export interface TimelineEvents {
     [EventType.CallEncryptionKeysPrefix]: EncryptionKeysEventContent;
     [EventType.CallNotify]: ICallNotifyContent;
     [EventType.RTCNotification]: IRTCNotificationContent;
+    [EventType.RTCDecline]: IRTCDeclineContent;
     [M_BEACON.name]: MBeaconEventContent;
     [M_POLL_START.name]: PollStartEventContent;
     [M_POLL_END.name]: PollEndEventContent;

src/client.ts

@@ -3589,6 +3589,12 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         return await this.setRoomReadMarkersHttpRequest(roomId, rmEventId, rrEventId, rpEventId);
     }
 
+    public sendRtcDecline(roomId: string, notificationEventId: string): Promise<ISendEventResponse> {
+        return this.sendEvent(roomId, EventType.RTCDecline, {
+            "m.relates_to": { event_id: notificationEventId, rel_type: RelationType.Reference },
+        });
+    }
+
     /**
      * Get a preview of the given URL as of (roughly) the given point in time,
      * described as an object with OpenGraph keys and associated values.

src/matrixrtc/types.ts

@@ -104,6 +104,12 @@ export interface IRTCNotificationContent extends RelationEvent {
     "lifetime": number;
 }
 
+/**
+ * MSC4310 decline event content for `org.matrix.msc4310.rtc.decline`.
+ * Sent as a standard m.reference relation to an `org.matrix.msc4075.rtc.notification` event.
+ */
+export interface IRTCDeclineContent extends RelationEvent {}
+
 export enum Status {
     Disconnected = "Disconnected",
     Connecting = "Connecting",