public SendMessageResponse SendMessage(ISession session, SendMessageRequest request)
{
var response = request.CreateResponse<SendMessageResponse>();
Logger.Info("SendMessage from Id={0} (Device={1}) to Id={2} ({3} devices)",
session.UserId, session.DeviceId.Cut(), request.ReceiverUserId, request.Keys != null ? request.Keys.Count : -1);
Dictionary<string, long> actualMessageReceiversDevices = null;
Dictionary<string, byte[]> keys = request.Keys;
if (request.GroupId != Guid.Empty)// group conversation
{
var groupChat = _groupChatsRepository.GetChat(request.GroupId);
//sender is in the group?
if (groupChat.Participants.All(i => i.UserId != session.UserId))
{
response.Success = false;
response.Error = Errors.YouAreNotParticipantOfThatGroup;
return response;
}
if (keys == null) //means not encrypted
{
keys = groupChat.Participants
.SelectMany(p => p.Devices)
.Where(p => p != session.DeviceId)
.Distinct()
.ToDictionary<string, string, byte[]>(k => k, v => null); //null value means unencrypted
}
else
{
//it means we will check all provided devices below (see if (actualMessageReceiversDevices != null)) -- just to avoid copy-paste
actualMessageReceiversDevices = new Dictionary<string, long>();
foreach (var groupChatParticipant in groupChat.Participants)
{
foreach (var device in groupChatParticipant.Devices)
{
actualMessageReceiversDevices[device] = groupChatParticipant.UserId;
}
}
}
}
else // private conversation
{
if (request.ReceiverUserId == session.UserId)
{
response.Success = false;
response.Error = Errors.SendMessage_ReceiverAndSenderAreSame;
return response;
}
if (keys == null)//means not encrypted
{
keys = _devicesRepository.GetDevices(request.ReceiverUserId).ToDictionary<string, string, byte[]>(k => k, v => null);
}
else
{
//it means we will check all provided devices below (see if (actualMessageReceiversDevices != null)) -- just to avoid copy-paste
actualMessageReceiversDevices = _devicesRepository.GetDevices(request.ReceiverUserId).ToDictionary(k => k, v => request.ReceiverUserId);
}
}
if (actualMessageReceiversDevices != null) //TODO: uncoment later
{
var providedDevices = keys.Select(i => i.Key);
List<string> union;
List<string> notProvidedDevices; //conversation has more devices than user provided as targets
List<string> wrongDevices; //some of the devices user provided are not members of that conversation
actualMessageReceiversDevices.Select(i => i.Key)
.FindIntersectionAndDifference(providedDevices, out union, out notProvidedDevices, out wrongDevices);
if (notProvidedDevices.Any())
{
response.Success = false;
response.Error = Errors.SendMessage_ProvideKeysForTheseDevices;
//we will help the user - provide public keys as well
response.MissedDevicesWithPublicKeysToReEncrypt = notProvidedDevices
.Where(d => session.DeviceId != d)
.Select(d => new PublicKeyInfo
{
DeviceId = d,
PublicKey = _devicesRepository.GetPublicKeyForDevice(d),
UserId = actualMessageReceiversDevices[d]
})
.ToList();
return response;
}
//cut receivers not in the conversation
//TODO: uncomment it later
/*foreach (var key in wrongDevices)
{
keys.Remove(key);
}*/
}
keys.Remove(session.DeviceId);
if (keys.Count < 1)
{
response.Success = false;
response.Error = Errors.SendMessage_ReceiversNotFound;
return response;
}
foreach (var key in keys)
{
var innerMsg = new Message
{
SenderAccessToken = session.AccessToken,
Text = request.Message,
GroupId = request.GroupId,
SenderId = session.UserId,
SenderDeviceId = session.DeviceId,
SenderName = request.SenderName,
ReceiverId = request.ReceiverUserId,
MessageTypeId = (int)request.MessageType,
Thumbnail = request.Thumbnail,
ReceiverDeviceId = key.Key,
EncryptionKey = key.Value,
MessageToken = request.MessageToken,
};
_messageEventManager.DeliverEventToDevice(innerMsg);
}
return response;
}