public static JsonPacket Send(JsonPacket packet)
{
if (!s_Initialized)
{
Initialize();
}
string json_request = packet.Serialize();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Constants.HOST);
request.Method = "POST";
request.ContentType = "application/json";
request.ContentLength = json_request.Length;
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(json_request);
streamWriter.Close();
var httpResponse = (HttpWebResponse)request.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
string response = streamReader.ReadToEnd();
return(JsonPacket.Deserialize(response.ToString()));
}
}
}
/// <summary>
/// Sends an encrypted message to each connected client in the chat
/// with their public key
/// </summary>
/// <param name="message"></param>
public void SendMessage(Message message)
{
//convert message to XML
string messageXml = Message.ToXML(message);
List <ConnectedClientEncryptedMessage> clientEncryptedMessages = new List <ConnectedClientEncryptedMessage>();
foreach (ConnectedClient client in this.GetConnectedClients())
{
string key = "";
string IV = "";
string clientEncryptedMessage = Cryptor.AesEncrypt(messageXml, ref key, ref IV);
string encryptedKey = Cryptor.RsaEncrypt(key, client.PublicKey);
string encryptedIV = Cryptor.RsaEncrypt(IV, client.PublicKey);
clientEncryptedMessages.Add(new ConnectedClientEncryptedMessage(client.UniqueID, this.UniqueID, encryptedKey, encryptedIV, clientEncryptedMessage));
}
JsonPacket packet = new JsonPacket(Constants.REQUEST_CLIENT_SEND_CHAT_MESSAGE);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_UNIQUE_ID", this.UniqueID);
//attach client encryptedMessages
packet.Add("CHAT_CLIENT_MESSAGES", JsonConvert.SerializeObject(clientEncryptedMessages));
JsonPacket response = Request.Send(packet);
//TODO: check response for errors
}
/// <summary>
/// Checks the server for client messages sent by other users it then decrypts these messages storing them
/// in the chat
/// </summary>
public void CheckForMessages()
{
JsonPacket packet = new JsonPacket(Constants.REQUEST_CHAT_CHECK_MESSAGE);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_UNIQUE_ID", this.UniqueID);
JsonPacket response = Request.Send(packet);
string messagesJSON = response.Data["MESSAGES"];
List <ConnectedClientEncryptedMessage> messages = JsonConvert.DeserializeObject <List <ConnectedClientEncryptedMessage> >(messagesJSON);
if (messages.Count > 0)
{
foreach (var message in messages)
{
string decryptedKey = Cryptor.RsaDecrypt(message.EncryptedAESKey, Client.Get().CryptographicKeyPair.PrivateKey);
string decryptedIV = Cryptor.RsaDecrypt(message.EncryptedAESIV, Client.Get().CryptographicKeyPair.PrivateKey);
Message msg = Message.FromXML(Cryptor.AesDecrypt(message.EncryptedMessage, decryptedKey, decryptedIV));
if (!Messages.Any(k => k.UniqueID == msg.UniqueID))
{
Messages.Add(msg);
}
}
}
}
/// <summary>
/// Returns a list of Connected Clients in the chat containing their public ID and RSA public key
/// </summary>
/// <returns></returns>
public List <ConnectedClient> GetConnectedClients()
{
JsonPacket packet = new JsonPacket(Constants.REQUEST_CHAT_GET_CONNECTED_CLIENTS);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_UNIQUE_ID", this.UniqueID);
JsonPacket response = Request.Send(packet);
string connectedClientJSON = response.Data["CONNECTED_CLIENTS"];
List <ConnectedClient> connectedClients = JsonConvert.DeserializeObject <List <ConnectedClient> >(connectedClientJSON);
return(connectedClients);
}
/// <summary>
/// Constructs an instance of the user Client saving the details on disk
/// </summary>
private Client()
{
CryptographicKeyPair = new KeyPair();
JsonPacket packet = new JsonPacket(Constants.REQUEST_GET_CLIENT_IDENTIFIER);
packet.Add("CLIENT_PUBLIC_KEY", CryptographicKeyPair.PublicKey);
JsonPacket response = Request.Send(packet);
UniqueID = response.Data["CLIENT_UNIQUE_ID"];
ShortID = response.Data["CLIENT_SHORT_ID"];
Token = response.Data["CLIENT_TOKEN"];
FileIO.Save(this);
}
/// <summary>
/// Constructs a chat which already exists when the client wishes to join a chat
/// </summary>
/// <param name="chatShortID"></param>
/// <param name="password"></param>
private Chat(string chatShortID, string password)
{
JsonPacket packet = new JsonPacket(Constants.REQUEST_CLIENT_JOIN_CHAT);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_SHORT_ID", chatShortID);
packet.Add("CHAT_PASSWORD", password);
JsonPacket response = Request.Send(packet);
UniqueID = response.Data["CHAT_UNIQUE_ID"];
ShortID = response.Data["CHAT_SHORT_ID"];
Messages = new List <Message>();
}
