} // end of Greet Me
/// <summary>
/// Login
/// Logs in a registered user.
/// Throws faults (to client) if there are issues
/// </summary>
/// <param name="username">(string) username to login</param>
/// <returns>(boolean) true if successful, false otherwise</returns>
public bool Login(string username)
{
bool loggedin = false;
// First Verify User Not Already Logged In
if (!(LoggedInUsers.Any(x => x.UserName == username)))
{
// See if User is Registered
if (RegisteredUsers.Any(x => x.UserName == username))
{
// User is Already Authenticated Per Custom Validator
LoggedInUsers.Add(RegisteredUsers.Find(x => x.UserName == username));
loggedin = true;
Console.WriteLine($"User {username} logged in.");
// Send message to callback
SendMessageToUsers($"User {username} logged in.");
}
// User is Not Registered
else
{
loggedin = false;
// This will be sent to client as a generic fault
throw new ArgumentException("User: "******" is not registered");
}
}
else
{
loggedin = false;
// Send custom fault to client
DuplicateUserFault fault = new DuplicateUserFault()
{
Reason = "User '" + username + "' already logged in!"
};
throw new FaultException <DuplicateUserFault>(fault, fault.Reason);
}
return(loggedin);
} // end of method
