private async Task HandleGroupLeaveMessage(SignalServiceEnvelope envelope, SignalServiceContent content, SignalServiceDataMessage dataMessage, bool isSync, long timestamp) { SignalServiceGroup sentGroup = dataMessage.Group; if (sentGroup != null) { string groupid = Base64.EncodeBytes(sentGroup.GroupId); SignalGroup group = await SignalDBContext.GetOrCreateGroupLocked(groupid, 0); if (isSync) { SignalContact author = await SignalDBContext.GetOrCreateContactLocked(envelope.GetSource(), 0); SignalMessage sm = new SignalMessage() { Direction = SignalMessageDirection.Incoming, Type = SignalMessageType.GroupLeave, Status = SignalMessageStatus.Received, Author = author, Content = new SignalMessageContent() { Content = $"You have left the group." }, ThreadId = groupid, DeviceId = (uint)envelope.GetSourceDevice(), Receipts = 0, ComposedTimestamp = envelope.GetTimestamp(), ReceivedTimestamp = timestamp, }; SignalConversation updatedConversation = SignalDBContext.RemoveMemberFromGroup(groupid, author, sm); await SignalLibHandle.Instance.DispatchAddOrUpdateConversation(updatedConversation, sm); } else { SignalContact author = await SignalDBContext.GetOrCreateContactLocked(envelope.GetSource(), 0); SignalMessage sm = new SignalMessage() { Direction = SignalMessageDirection.Incoming, Type = SignalMessageType.GroupLeave, Status = SignalMessageStatus.Received, Author = author, Content = new SignalMessageContent() { Content = $"{author.ThreadDisplayName} has left the group." }, ThreadId = groupid, DeviceId = (uint)envelope.GetSourceDevice(), Receipts = 0, ComposedTimestamp = envelope.GetTimestamp(), ReceivedTimestamp = timestamp, }; SignalConversation updatedConversation = SignalDBContext.RemoveMemberFromGroup(groupid, author, sm); await SignalLibHandle.Instance.DispatchAddOrUpdateConversation(updatedConversation, sm); } } else { Logger.LogError("HandleGroupLeaveMessage() received group update without group info"); } }