From 5535d7fb97da0af2e1bdd776c6ded1030e5392ee Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Tue, 16 Feb 2021 14:52:11 +0000
Subject: [PATCH] Prepare to encrypt when a call arrives

So we're ready to send an answer straight away if the user answers
---
 src/CallHandler.tsx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/CallHandler.tsx b/src/CallHandler.tsx
index f106d75f8b..2be1c34a9f 100644
--- a/src/CallHandler.tsx
+++ b/src/CallHandler.tsx
@@ -681,6 +681,12 @@ export default class CallHandler {
                     Analytics.trackEvent('voip', 'receiveCall', 'type', call.type);
                     this.calls.set(mappedRoomId, call)
                     this.setCallListeners(call);
+
+                    // get ready to send encrypted events in the room, so if the user does answer
+                    // the call, we'll be ready to send. NB. This is the protocol-level room ID not
+                    // the mapped one: that's where we'll send the events.
+                    const cli = MatrixClientPeg.get();
+                    cli.prepareToEncrypt(cli.getRoom(call.roomId));
                 }
                 break;
             case 'hangup':