//
// OpenVPN Administrator
//
// Author(s): Everaldo Canuto <everaldo@simios.org>
//
// (C) 2006 Everaldo Canuto <everaldo@simios.org>
// (C) 2006 The Gang <www.the-gang.net>
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

using System;
using System.IO;
using Microsoft.Win32;
using System.Diagnostics;
using System.ComponentModel;
using Mono.Unix;

namespace OpenVPN.Admin
{
	/// <summary>
	/// Certificate class for OpenVPN Certificate Wizard.
	/// </summary>
	public class Certificate
	{

		#region Fields

		private bool win32;
		private string openssl = "openssl";
		private string config  = "";
		private string keysize = "1024";
		private string name;
		private string email; 
		private string country;
		private string state;
		private string city;
		private string organization;
		private string unit;
		private string passphrase;
		private string path;
		private string fileprefix;
		private string keyfile;
		private string requestfile;

		#endregion

		#region Constructors and destructors

		public Certificate()
		{
			// Verify if is win32 enviroment.
			this.win32 = ((System.Environment.OSVersion.Platform == PlatformID.Win32NT) || 
						  (System.Environment.OSVersion.Platform == PlatformID.Win32Windows) ||
						  (System.Environment.OSVersion.Platform == PlatformID.Win32S));
			
			// Set openssl path for win32 enviroments.
			if (this.win32)
			{
				RegistryKey registry = Registry.LocalMachine.OpenSubKey("Software\\OpenVPN");
				if (registry != null)
				{
					string path = System.IO.Path.GetDirectoryName(registry.GetValue("exe_path").ToString())
								 +System.IO.Path.DirectorySeparatorChar.ToString()
								 +"openssl.";

					if (File.Exists(path + "exe"))
						this.openssl = path + "exe";
					
					if (File.Exists(path + "conf"))
						this.config = path + "conf";
				}
			} 
		}

		#endregion
		
		#region Public methods
		
		public void Make()
		{
			if (!System.IO.Directory.Exists(this.path))
			{
				System.IO.Directory.CreateDirectory(this.path);
				if (!System.IO.Directory.Exists(this.path))
					throw new Exception(Catalog.GetString("Invalid folder name!"));
			}
			
			this.keyfile     = this.fileprefix + ".key";
			this.requestfile = this.fileprefix + ".csr";
			
			string subj = "\"/CN="+this.name;
			subj = subj + ((this.email        == "") ? "" : "/emailAddress="+this.email);
			subj = subj + ((this.country      == "") ? "" : "/C="+this.country );
			subj = subj + ((this.state        == "") ? "" : "/ST="+this.state);
			subj = subj + ((this.city         == "") ? "" : "/L="+this.city);
			subj = subj + ((this.organization == "") ? "" : "/O="+this.organization);
			subj = subj + ((this.unit         == "") ? "" : "/OU="+this.unit);
			subj = subj + "\"";
			
			string args = String.Format("req -days 3650 -newkey rsa:{1} -keyout {2} -out {3} -subj {4}",
										this.passphrase, this.keysize, this.keyfile, this.requestfile, subj);
			
			args = args + String.Format(" -passout pass:{0}", this.passphrase);
			
			if (this.config != "")
			{
				args = args + String.Format(" -config \"{0}\"", this.config);
			}
			
			#if DEBUG
				StreamWriter SW;
				SW = File.CreateText("c:\\Temp\\openssl.log");
				SW.WriteLine(this.path + " " + this.openssl + " " + args);
				SW.Close();
			#endif

			
			Console.WriteLine(this.openssl + " " + args);
			
			Process process = new Process();
			process.StartInfo.UseShellExecute        = false;
			process.StartInfo.RedirectStandardOutput = false;
			process.StartInfo.RedirectStandardError  = true;
			process.StartInfo.RedirectStandardInput  = true;
			process.StartInfo.CreateNoWindow         = true;
			process.StartInfo.WorkingDirectory       = this.path;
			process.StartInfo.FileName               = this.openssl;
			process.StartInfo.Arguments              = args;
			process.EnableRaisingEvents              = true;
			process.Start();
			process.WaitForExit();
		}

		#endregion
		
		#region Public properties

		public string KeySize
		{
			get { return this.keysize; }
			set { this.keysize = value; }
		}
		
		public string Name
		{
			get { return this.name; }
			set { this.name = value; }
		}
		
		public string EMail
		{
			get { return this.email; }
			set { this.email = value; }
		}

		public string Country
		{
			get { return this.country; }
			set { this.country = value; }
		}
		
		public string State
		{
			get { return this.state; }
			set { this.state = value; }
		}

		public string City
		{
			get { return this.city; }
			set { this.city = value; }
		}
		
		public string Organization
		{
			get { return this.organization; }
			set { this.organization = value; }
		}

		public string Unit
		{
			get { return this.unit; }
			set { this.unit = value; }
		}

		public string Passphrase
		{
			get { return this.passphrase; }
			set { this.passphrase = value; }
		}

		public string Path
		{
			get { return this.path; }
			set { this.path = value; }
		}
		
		public string FilePrefix
		{
			get { return this.fileprefix; }
			set { this.fileprefix = value; }
		}
		
		public string KeyFile
		{
			get { return this.path + System.IO.Path.DirectorySeparatorChar.ToString() + this.keyfile; }
		}

		public string RequestFile
		{
			get { return this.path + System.IO.Path.DirectorySeparatorChar.ToString() + this.requestfile; }
		}

		#endregion 
	}
}