//
// System.Web.Configuration.MachineKeyConfigHandler
//
// Authors:
//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc (http://www.ximian.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections;
using System.Configuration;
using System.Xml;

namespace System.Web.Configuration
{
	class MachineKeyConfigHandler : IConfigurationSectionHandler
	{
		public object Create (object parent, object context, XmlNode section)
		{
			if (section.HasChildNodes)
				ThrowException ("Child nodes not allowed here", section.FirstChild);

			MachineKeyConfig config = new MachineKeyConfig (parent);

			try {
				config.SetValidationKey (AttValue ("validationKey", section));
			} catch (ArgumentException e) {
				ThrowException (e.Message, section);
			}

			try {
				config.SetDecryptionKey (AttValue ("decryptionKey", section));
			} catch (ArgumentException e) {
				ThrowException (e.Message, section);
			}

			string validation = AttValue ("validation", section);
			MachineKeyValidation valid = 0;
			if (validation == "SHA1")
				valid = MachineKeyValidation.SHA1;
			else if (validation == "MD5")
				valid = MachineKeyValidation.MD5;
			else if (validation == "TripleDES")
				valid = MachineKeyValidation.TripleDES;
			else
				ThrowException ("Invalid 'validation' value", section);

			config.ValidationType = valid;

			if (section.Attributes != null && section.Attributes.Count != 0)
				ThrowException ("Unrecognized attribute", section);

			return config;
		}

		// A few methods to save some typing
		static string AttValue (string name, XmlNode node)
		{
			return HandlersUtil.ExtractAttributeValue (name, node, true);
		}

		static void ThrowException (string message, XmlNode node)
		{
			HandlersUtil.ThrowException (message, node);
		}
		//

	}
}