public static JsonCapsula GetJsonDecoded(Context context, byte[] message, long senderId)
{
byte[] aesBinKey = context.Contacts
.Where(u => u.PublicId == senderId)
.Select(u => u.ReceiveAesKey)
.SingleOrDefault();
AESPassword key = new AESPassword(aesBinKey);
byte[] decrypted = key.Decrypt(message);
MemoryStream stream = new MemoryStream(decrypted);
JsonTypes type = (JsonTypes)BinaryEncoder.ReadInt(stream);
string jsonText = TextEncoder.ReadString(stream);
byte[] attechment = null;
int isAttechment = BinaryEncoder.ReadInt(stream);
if (isAttechment == 1)
{
attechment = BinaryEncoder.ReceiveBytes(stream);
}
IJType jmessage;
switch (type)
{
case JsonTypes.ALARM:
jmessage = JsonConvert.DeserializeObject <JAlarm>(jsonText);
break;
case JsonTypes.CONTACT:
jmessage = JsonConvert.DeserializeObject <JContact>(jsonText);
break;
case JsonTypes.MESSAGES:
jmessage = JsonConvert.DeserializeObject <JMessage>(jsonText);
break;
case JsonTypes.MESSAGES_THREAD:
jmessage = JsonConvert.DeserializeObject <JMessageThread>(jsonText);
break;
default:
throw new Exception("Unknown JsonType.");
}
return(new JsonCapsula()
{
Attechment = attechment,
Message = jmessage
});
}
private void UntrustContact()
{
int recepientId = BinaryEncoder.ReadInt(stream);
using (Context context = new Context(config))
{
var key = context.UsersKeys
.Where(u => u.RecepientId == recepientId)
.Where(u => u.SenderId == connectionInfo.UserId)
.SingleOrDefault();
if (key != null)
{
key.Trusted = false;
context.SaveChanges();
}
}
Log("Untrust contact done.");
}
private void TrustContact()
{
int recepientId = BinaryEncoder.ReadInt(stream);
using (Context context = new Context(config))
{
var key = context.UsersKeys
.Where(u => u.RecepientId == recepientId)
.Where(u => u.SenderId == connectionInfo.UserId)
.SingleOrDefault();
if (BinaryEncoder.ReadInt(stream) == 0)
{
Log("No new key will be received.");
key.Trusted = true;
}
else
{
Log("Receiving new key.");
var aesKey = BinaryEncoder.ReceiveBytes(stream);
if (key != null)
{
Log("Updating denied!");
//key.AesKey = aesKey;
key.Trusted = true;
}
else
{
key = new UsersKeys()
{
RecepientId = recepientId,
SenderId = connectionInfo.UserId,
AesKey = aesKey,
Trusted = true
};
context.Add(key);
}
}
context.SaveChanges();
}
Log("Trust contact done.");
}
