//////////////////////////////////////////////////
///// STRUCTORS //////////////////////////////////
public UserSession(string username, string address, double lifeSpan,
IUserPortalServerController_Callback callbackChannel, User userData)
: base(username, address, lifeSpan)
{
if (callbackChannel == null)
{
throw new ArgumentNullException("callbackChannel cannot be null");
}
if (userData == null)
{
throw new ArgumentNullException("userData cannot be null");
}
CallbackChannel = callbackChannel;
UserData = userData;
}
/* returns null if:
* - already logged in
* - database connection failed
* - database authentication failed
* - user data is null
* - username is null
*/
public string Login(string address, string username, string password, out ECode ec)
{
ec = ECode.None;
string token = null;
IUserPortalServerController_Callback callbackChannel
= OperationContext.Current.GetCallbackChannel <IUserPortalServerController_Callback>();
try
{
// Check credentials against database //
int id = DSConnection.AuthenticateCredentials(username, password);
if (id != -1) // valid
{
// Check if already logged in //
if (UserRegistry.IsPuidRegistered(username) == false)
{
// Log in User //
User user = DSConnection.GetUser(id);
UserSession session = new UserSession(username, address, USER_LIFESPAN, callbackChannel, user);
token = UserRegistry.RegisterClient(session);
Console.WriteLine("> New Login: @username:{" + username + "} token:{" + token + "}");
}
else
{ // Retrieve existing session token //
token = UserRegistry.GetToken(username);
((UserSession)UserRegistry.GetClientSession(token)).CallbackChannel = callbackChannel; // update callback channel
Console.WriteLine("> Old Login: @username:{" + username + "} token:{" + token + "}");
}
}
else
{
Console.WriteLine("> Failed Login: @username:{" + username + "}");
}
} catch (DataServerException ex) {
// occurs if any of the database queries fail
ec = ex.ErrorCode;
} catch (ArgumentNullException) {
// occurs if username or user data is null
ec = ECode.QueryError;
}
return(token);
}
