async Task OnMessageArrived (Message msg)
{
try {
await conversationLoadTaskCompletionSource.Task; //prevent adding a new conversation before all conversations are loaded
await newMessagesSemaphore.WaitAsync ();
await UpdateConversationsWith (msg);
newMessagesSemaphore.Release ();
} catch (Exception ex) {
App.Logger.Report (ex);
}
}
public async Task<SendMessageResult> SendMessageAsync(Message message)
{
try
{
Dictionary<string, byte[]> keys = null;
string text = message.Text;
await messageRepository.AddMessageAsync(message);
if (EncryptionEnabled)
{
var deviceIdAndPublicKeyMap = await deviceInfoProvider.GetUserDevicesAndPublicKeys((int) message.Recipient);
if (deviceIdAndPublicKeyMap.Count > 0)
{
//don't forget current user's other devices
var myDevices = await deviceInfoProvider.GetUserDevicesAndPublicKeys(Settings.MyId);
foreach (var myDevice in myDevices)
{
if (myDevice.Key != Settings.UserDeviceId && myDevice.Key != Settings.MyId.ToString())
deviceIdAndPublicKeyMap[myDevice.Key] = myDevice.Value;
}
text = cryptoService.Encrypt(message.Text, deviceIdAndPublicKeyMap, out keys);
}
}
var request = new SendMessageRequest
{
ReceiverUserId = message.Recipient,
SenderName = Settings.NickName,
MessageType = ServerClient.Entities.Ws.Requests.MessageType.Text,
MessageToken = message.MessageToken,
Thumbnail = message.Thumbnail,
GroupId = message.GroupId,
Message = text,
Keys = keys,
};
var response = await messagingService.SendMessage(request);
if (response.Error == Errors.SendMessage_ProvideKeysForTheseDevices)
{
foreach (var item in response.MissedDevicesWithPublicKeysToReEncrypt)
{
await deviceInfoProvider.SavePublicKeyForDeviceId(item.DeviceId, item.UserId, Convert.ToBase64String(item.PublicKey));
}
//try again
return await SendMessageAsync(message);
}
if (response.Error == Errors.SendMessage_ReceiversNotFound)
{
return SendMessageResult.ReceiverUnknown;
}
if (response.Error == Errors.SendMessage_ReceiverAndSenderAreSame)
{
return SendMessageResult.ReceiverAndSenderAreSame;
}
OnMessageSent(message.MessageToken);
return SendMessageResult.Ok;
}
catch (ConnectionException)
{
return SendMessageResult.ConnectionError;
}
catch (Exception ex)
{
App.Logger.Report (ex);
return SendMessageResult.UnknownError;
}
}
private async void OnIncomingMessages(IEnumerable<IncomingMessage> messages)
{
if (messages == null)
{
return;
}
var incomingMessages = messages.Where(m => m.GroupId == Guid.Empty /*not supported yet*/).OrderBy(m => m.Time).ToList();
foreach (var msg in incomingMessages)
{
string decryptedText = msg.Text;
try
{
if (msg.EncryptionKey != null && msg.EncryptionKey.Length > 0)
{
decryptedText = cryptoService.Decrypt(msg.Text, msg.EncryptionKey);
}
}
catch (Exception)
{
decryptedText = DecryptionErrorMessage;
}
var dbMessage = new Message(msg.MessageToken, msg.EventId, msg.Time, msg.ToUserId, msg.FromUserId, decryptedText, msg.Thumbnail, MessageStatus.Delivered);
await messageRepository.AddMessageAsync(dbMessage);
MessageArrived(this, new MessageEventArgs { Message = dbMessage });
}
SendMessageAck(incomingMessages.Select(m => m.EventId).ToList());
}
public async Task MarkMessageAsSeen(Message message)
{
if (Settings.MyId == message.Sender)
{
//multi-device message
return;
}
await messagingService.MarkMessageAsSeen(new MarkMessageAsSeenRequest
{
MessagesAuthor = message.Sender,
MessagesSeen = new List<Guid> {message.MessageToken}
});
message.Status = MessageStatus.Seen;
await messageRepository.UpdateMessageStatusAsync(message.MessageToken, message.Status);
}
public async Task SendMessage(string text, byte[] image = null)
{
try
{
currentUserTypingController.HandleOutgoingMessage();
Settings.KinderPoints = Settings.KinderPoints + 1;
await messageLoadTaskCompletionSource.Task;
App.ConversationsViewModel.IsDirty = true;
var message = new Message(Guid.NewGuid(), Guid.Empty, DateTime.UtcNow, recipientId, Settings.MyId, text, image, MessageStatus.Unsent);
Messages.Add(MessageViewModelFactory.Create(message));
//chatting with fake contacts
if (recipientId < 0)
{
dataManager.AddMessageAsync(message);
return;
}
var sendMessageResult = await App.MessagesManager.SendMessageAsync(message);
switch (sendMessageResult)
{
case SendMessageResult.Ok:
break;
case SendMessageResult.ConnectionError:
App.MessageDialog.SendMessage("Internet connection is required", "No service");
break;
case SendMessageResult.ReceiverUnknown:
App.MessageDialog.SendMessage("Receiver was not found on the server", "Error");
break;
case SendMessageResult.ReceiverAndSenderAreSame:
App.MessageDialog.SendMessage("That's you!", "Error");
break;
case SendMessageResult.UnknownError:
App.MessageDialog.SendMessage("Oops... something went wrong", "Error");
break;
default:
throw new ArgumentOutOfRangeException();
}
App.Logger.Track("SendMessage");
}
catch (Exception ex)
{
App.Logger.Report (ex);
App.MessageDialog.SendMessage("Message wasn't sent", "Oops..");
}
}
async Task UpdateConversationsWith (Message incomingMsg)
{
Message existingConversation = conversations.FirstOrDefault (c => c.ConversationId == incomingMsg.ConversationId);
if (existingConversation != null)
ReplaceConversation (existingConversation, incomingMsg);
else
await AddConversation (incomingMsg);
}
void CopyNamePhoto (Message src, Message dst)
{
dst.FriendPhoto = src.FriendPhoto;
dst.FriendName = src.FriendName;
}
async Task<Friend> GetFriend (Message msg)
{
long id = GetFriendId (msg);
var friend = await DataManager.GetFriendAsync (id);
if (friend == null) {
friend = new Friend { FriendId = id, Name = string.Empty };
await App.FriendsViewModel.UpdateFriendInfoAsync (friend);
}
return friend;
}
long GetFriendId (Message msg)
{
// This is equivalent to Settings.MyId == msg.Recipient ? msg.Sender : msg.Recipient;
// but has a simmetry between Sender and msg.Recipient
return Settings.MyId ^ (msg.Recipient ^ msg.Sender);
}
async Task FillNameAndPhoto (Message msg)
{
var friend = await GetFriend (msg);
CopyNamePhoto (friend, msg);
}
async Task AddConversation (Message incomingMsg)
{
await FillNameAndPhoto (incomingMsg);
conversations.Insert (0, incomingMsg);
}
void ReplaceConversation (Message existingConversation, Message incomingMsg)
{
conversations.Remove (existingConversation);
CopyNamePhoto (existingConversation, incomingMsg);
conversations.Insert (0, incomingMsg); //new conversation on the top
}
public async Task<bool> AddMessageAsync(Message message)
{
//using (await LockAsync())
{
Message existingMsg = null;
if (message.MessageToken != Guid.Empty)
{
//ignore duplicates (by Token) - it may happen
existingMsg = await database.GetItemAsync<Message>(msg => msg.MessageToken == message.MessageToken);
if (existingMsg != null && message.Id < 1)
{
message.Id = existingMsg.Id;
}
}
await database.SaveItemAsync<Message>(message);
return existingMsg == null;
}
}
void HandleStatusChanged(Message message, int index)
{
}