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Fix invite -> leave -> join
dance when accepting invites (#2817)
As mentioned in https://github.com/matrix-org/dendrite/issues/2361#issuecomment-1139394565 and observed by ourselves, this should fix the odd `invite -> leave -> join` dance when accepting invites.
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@ -428,6 +428,13 @@ func (s *OutputRoomEventConsumer) onRetireInviteEvent(
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return
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}
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// Only notify clients about retired invite events, if the user didn't accept the invite.
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// The PDU stream will also receive an event about accepting the invitation, so there should
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// be a "smooth" transition from invite -> join, and not invite -> leave -> join
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if msg.Membership == gomatrixserverlib.Join {
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return
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}
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// Notify any active sync requests that the invite has been retired.
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s.inviteStream.Advance(pduPos)
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s.notifier.OnNewInvite(types.StreamingToken{InvitePosition: pduPos}, msg.TargetUserID)
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@ -74,21 +74,26 @@ func (p *InviteStreamProvider) IncrementalSync(
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return to
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}
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for roomID := range retiredInvites {
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if _, ok := req.Response.Rooms.Join[roomID]; !ok {
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lr := types.NewLeaveResponse()
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h := sha256.Sum256(append([]byte(roomID), []byte(strconv.FormatInt(int64(to), 10))...))
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lr.Timeline.Events = append(lr.Timeline.Events, gomatrixserverlib.ClientEvent{
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// fake event ID which muxes in the to position
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EventID: "$" + base64.RawURLEncoding.EncodeToString(h[:]),
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OriginServerTS: gomatrixserverlib.AsTimestamp(time.Now()),
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RoomID: roomID,
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Sender: req.Device.UserID,
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StateKey: &req.Device.UserID,
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Type: "m.room.member",
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Content: gomatrixserverlib.RawJSON(`{"membership":"leave"}`),
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})
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req.Response.Rooms.Leave[roomID] = lr
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if _, ok := req.Response.Rooms.Invite[roomID]; ok {
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continue
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}
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if _, ok := req.Response.Rooms.Join[roomID]; ok {
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continue
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}
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lr := types.NewLeaveResponse()
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h := sha256.Sum256(append([]byte(roomID), []byte(strconv.FormatInt(int64(to), 10))...))
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lr.Timeline.Events = append(lr.Timeline.Events, gomatrixserverlib.ClientEvent{
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// fake event ID which muxes in the to position
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EventID: "$" + base64.RawURLEncoding.EncodeToString(h[:]),
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OriginServerTS: gomatrixserverlib.AsTimestamp(time.Now()),
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RoomID: roomID,
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Sender: req.Device.UserID,
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StateKey: &req.Device.UserID,
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Type: "m.room.member",
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Content: gomatrixserverlib.RawJSON(`{"membership":"leave"}`),
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})
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req.Response.Rooms.Leave[roomID] = lr
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}
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return maxID
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