RSS Feed Aggregator and Blogging Smart Client

// Copyright � 2005 by Omar Al Zabir. All rights are reserved.
// 
// If you like this code then feel free to go ahead and use it.
// The only thing I ask is that you don't remove or alter my copyright notice.
//
// Your use of this software is entirely at your own risk. I make no claims or
// warrantees about the reliability or fitness of this code for any particular purpose.
// If you make changes or additions to this code please mark your code as being yours.
// 
// website http://www.oazabir.com, email OmarAlZabir@gmail.com, msn oazabir@hotmail.com

using System;
using System.IO;
using System.Drawing;
using System.Drawing.Design;
using System.ComponentModel;
using System.Windows.Forms;
using System.Runtime.CompilerServices;

namespace RSSCommon.PropertyEditor
{
	/// <summary>
	/// Interface for providing password encryption and decryption feature
	/// </summary>
	public interface IPasswordProvider
	{
		string Encrypt( string data );
		string Decrypt( string data );
		string Hash( string data );
	}

	/// <summary>
	/// UITypeEditor for password type properties
	/// </summary>
	public class PasswordEditor : UITypeEditor
	{
		public static IPasswordProvider PasswordProvider;

		public PasswordEditor()
		{
			
		}

		[RefreshProperties(RefreshProperties.All)]
		public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object propertyValue)
		{
			if (((context == null) || (provider == null)) || (context.Instance == null))
			{
				return base.EditValue(provider, RuntimeHelpers.GetObjectValue(propertyValue));
			}
		
			using( PasswordEditorForm form = new PasswordEditorForm() )
			{
				try
				{
					// Decrypt the password and show on the form. Although unnecessary
					form.Password = PasswordProvider.Decrypt( (string)propertyValue );
				}
				catch
				{
					MessageBox.Show( "Cannot decrypt the password. Make sure you are not manually typing the password." );
				}

				if( DialogResult.OK == form.ShowDialog( Form.ActiveForm ) )
				{
					// Encrypt the password value and set
					propertyValue = PasswordProvider.Encrypt( form.Password );
				}
			}
			return propertyValue;
		}
 
		public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
		{
			if ((context != null) && (context.Instance != null))
			{
				return UITypeEditorEditStyle.Modal;
			}
			return UITypeEditorEditStyle.None;
		}

	}
}