using System;
using System.DirectoryServices.AccountManagement;

namespace P4AuthAD
{
    /// <summary>
    /// This class implements a simple authentication trigger for P4 using
    /// Microsoft Active Directory as the back-end.
    /// </summary>
    class Program
    {
        static int Main(string[] args)
        {
            try
            {
                if (args.Length != 2)
                {
                    Console.WriteLine("Wrong number of arguments!");
                    Console.WriteLine("Usage: {0} [domain] [user]", Environment.GetCommandLineArgs()[0]);
                    Console.WriteLine("Pass the password via stdin.");
                    Console.WriteLine("Return code: 0 on success, != 0 on error");
                    return -1;
                }

                string domain = args[0];
                string user = args[1];
                string password = Console.ReadLine();

                // create a "principal context" - e.g. your domain (could be machine, too)
                using (var pc = new PrincipalContext(ContextType.Domain, domain))
                {
                    // validate the credentials
                    bool isValid = pc.ValidateCredentials(user, password);

                    if (isValid)
                    {
                        Console.WriteLine("Success: Password verified.");
                        return 0;
                    }
                    else
                    {
                        Console.WriteLine("Error: Password incorrect");
                        return 1;
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error:");
                Console.WriteLine(ex);
                return -100;
            }
        }
    }
}