fix: handle leaving a 1:1 call over SFT [WPB-7151] (#6434)

packages/core/src/conversation/SubconversationService/SubconversationService.ts

@@ -151,6 +151,46 @@ export class SubconversationService extends TypedEventEmitter<Events> {
  await this.clearSubconversationGroupId(conversationId, SUBCONVERSATION_ID.CONFERENCE);
  }
 
+ /**
+ * Short term solution to an issues with 1:1 MLS call, see
+ * https://wearezeta.atlassian.net/wiki/spaces/PAD/pages/1314750477/2024-07-29+1+1+calls+over+SFT#Do-not-leave-the-subconversation
+ * Will delete a conference subconversation when hanging up on a 1:1 call instead of leaving.
+ *
+ * @param conversationId Id of the parent conversation which subconversation we want to leave
+ */
+ public async leave1on1ConferenceSubconversation(conversationId: QualifiedId): Promise<void> {
+ const subconversationGroupId = await this.getSubconversationGroupId(conversationId, SUBCONVERSATION_ID.CONFERENCE);
+
+ if (!subconversationGroupId) {
+ return;
+ }
+
+ const doesGroupExistLocally = await this.mlsService.conversationExists(subconversationGroupId);
+ if (!doesGroupExistLocally) {
+ // If the subconversation was known by a client but is does not exist locally, we can remove it from the store.
+ return this.clearSubconversationGroupId(conversationId, SUBCONVERSATION_ID.CONFERENCE);
+ }
+
+ try {
+ const epochInfo = await this.getSubconversationEpochInfo(conversationId, subconversationGroupId);
+
+ if (!epochInfo) {
+ throw new Error('Failed to get epoch info for conference subconversation');
+ }
+ await this.apiClient.api.conversation.deleteSubconversation(conversationId, SUBCONVERSATION_ID.CONFERENCE, {
+ groupId: subconversationGroupId,
+ epoch: epochInfo.epoch,
+ });
+ } catch (error) {
+ this.logger.error(`Failed to delete conference subconversation:`, error);
+ }
+
+ await this.mlsService.wipeConversation(subconversationGroupId);
+
+ // once we've deleted the subconversation, we can remove it from the store
+ await this.clearSubconversationGroupId(conversationId, SUBCONVERSATION_ID.CONFERENCE);
+ }
+
  public async leaveStaleConferenceSubconversations(): Promise<void> {
  const conversationIds = await this.getAllGroupIdsBySubconversationId(SUBCONVERSATION_ID.CONFERENCE);