steamguard-cli/Utils.cs

using System;

namespace SteamGuard
{
	public static class Utils
	{
		public static string ReadLineSecure()
		{
			string text = "";
			ConsoleKeyInfo key;
			int cursorIndex = 0;
			do
			{
				key = Console.ReadKey(true);
				if (((int)key.Key) >= 65 && ((int)key.Key <= 90))
				{
					if (cursorIndex == 0 || cursorIndex == text.Length - 1)
					{
						text += key.KeyChar.ToString();
					}
					else
					{
						text.Insert(cursorIndex, key.KeyChar.ToString());
					}
					cursorIndex++;
				}
				else if (key.Key == ConsoleKey.Backspace && cursorIndex > 0)
				{
					text.Remove(cursorIndex - 1, 1);
					cursorIndex--;
				}
				else if (key.Key == ConsoleKey.RightArrow)
				{
					cursorIndex++;
				}
				else if (key.Key == ConsoleKey.LeftArrow)
				{
					cursorIndex--;
				}

				if (cursorIndex < 0)
				{
					cursorIndex = 0;
				}
				else if (text.Length == 0 && cursorIndex > text.Length)
				{
					cursorIndex = 0;
				}
				else if (text.Length != 0 && cursorIndex >= text.Length)
				{
					cursorIndex = text.Length - 1;
				}

				// For debugging:
				// Console.Title = string.Format("{0}/{1} - {2} ({3}) - {4}", cursorIndex, text.Length, key.Key.ToString(), (int)key.Key, text);
			} while (key.Key != ConsoleKey.Enter);
			return text;
		}
	}
}