context: //
  // System.Web.Configuration.HttpHandlerAction
  //
  // Authors:
  //	Chris Toshok (toshok@ximian.com)
  //	Daniel Nauck    (dna(at)mono-project(dot)de)
  //
  // (C) 2005 Novell, Inc (http://www.novell.com)
  // (C) 2008 Daniel Nauck
  //
  
  //
  // 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.
  //
  
  #if NET_2_0
  
  using System;
  using System.Collections;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Configuration;
  using System.Reflection;
  using System.Text.RegularExpressions;
  using System.Threading;
  using System.Web;
  using System.Web.Util;
  
  namespace System.Web.Configuration
  {
  	public sealed class HttpHandlerAction: ConfigurationElement
  	{
  		static ConfigurationPropertyCollection _properties;
  		static ConfigurationProperty pathProp;
  		static ConfigurationProperty typeProp;
  		static ConfigurationProperty validateProp;
  		static ConfigurationProperty verbProp;
  
  		static HttpHandlerAction ()
  		{
  			pathProp = new ConfigurationProperty ("path", typeof (string), null,
  							      TypeDescriptor.GetConverter (typeof (string)),
  							      PropertyHelper.NonEmptyStringValidator,
  							      ConfigurationPropertyOptions.IsRequired | ConfigurationPropertyOptions.IsKey);
  			typeProp = new ConfigurationProperty ("type", typeof (string), null,
  							      TypeDescriptor.GetConverter (typeof (string)),
  							      PropertyHelper.NonEmptyStringValidator,
  							      ConfigurationPropertyOptions.IsRequired);
  			validateProp = new ConfigurationProperty ("validate", typeof (bool), true);
  			verbProp = new ConfigurationProperty ("verb", typeof (string), null,
  							      TypeDescriptor.GetConverter (typeof (string)),
  							      PropertyHelper.NonEmptyStringValidator,
  							      ConfigurationPropertyOptions.IsRequired | ConfigurationPropertyOptions.IsKey);
  
  			_properties = new ConfigurationPropertyCollection ();
  			_properties.Add (pathProp);
  			_properties.Add (typeProp);
  			_properties.Add (validateProp);
  			_properties.Add (verbProp);
  		}
  
  		internal HttpHandlerAction ()
  		{ }
  
  		public HttpHandlerAction (string path, string type, string verb)
  			: this (path, type, verb, true)
  		{ }
  
  		public HttpHandlerAction (string path, string type, string verb, bool validate)
  		{
  			Path = path;
  			Type = type;
  			Verb = verb;
  			Validate = validate;
  		}
  
  		[ConfigurationProperty ("path", Options = ConfigurationPropertyOptions.IsRequired | ConfigurationPropertyOptions.IsKey)]
  		// LAMESPEC: MS lists no validator here but provides one in Properties.
  		public string Path {
  			get { return (string) base[pathProp]; }
  			set { base[pathProp] = value; }
  		}
  
  		[ConfigurationProperty ("type", Options = ConfigurationPropertyOptions.IsRequired)]
  		// LAMESPEC: MS lists no validator here but provides one in Properties.
  		public string Type {
  			get { return (string) base[typeProp]; }
  			set { base[typeProp] = value; }
  		}
  
  		[ConfigurationProperty ("validate", DefaultValue = true)]
  		public bool Validate {
  			get { return (bool) base[validateProp]; }
  			set { base[validateProp] = value; }
  		}
  
  		[ConfigurationProperty ("verb", Options = ConfigurationPropertyOptions.IsRequired | ConfigurationPropertyOptions.IsKey)]
  		// LAMESPEC: MS lists no validator here but provides one in Properties.
  		public string Verb {
  			get { return (string) base[verbProp]; }
  			set { base[verbProp] = value; }
  		}
  
  		protected internal override ConfigurationPropertyCollection Properties {
  			get { return _properties; }
  		}
  
  #region CompatabilityCode
  		object instance;
  		Type type;
  
  		string cached_verb = null;
  		string[] cached_verbs;
  
  		string[] SplitVerbs ()
  		{
  			if (Verb == "*")
  				cached_verbs = null;
  			else
  				cached_verbs = Verb.Split (',');
  
  			return cached_verbs;
  		}
  
  		internal string[] Verbs {
  			get {
  				if (cached_verb != Verb) {
  					cached_verbs = SplitVerbs();
  					cached_verb = Verb;
  				}
  
  				return cached_verbs;
  			}
  		}
  
  		//
  		// Loads the a type by name and verifies that it implements
  		// IHttpHandler or IHttpHandlerFactory
  		//
  		internal static Type LoadType (string type_name)
  		{
  			Type t = null;
  			
  			t = HttpApplication.LoadType (type_name, false);
  
  			if (t == null)
  				throw new HttpException (String.Format ("Failed to load httpHandler type `{0}'", type_name));
  
  			if (typeof (IHttpHandler).IsAssignableFrom (t) ||
  			    typeof (IHttpHandlerFactory).IsAssignableFrom (t))
  				return t;
  			
  			throw new HttpException (String.Format ("Type {0} does not implement IHttpHandler or IHttpHandlerFactory", type_name));
  		}
  
  		internal bool PathMatches (string pathToMatch)
  		{
  			if (String.IsNullOrEmpty (pathToMatch))
  				return false;
  
  			bool result = false;
  			string[] handlerPaths = Path.Split (',');
  			int slash = pathToMatch.LastIndexOf ('/');
  			string origPathToMatch = pathToMatch;
  			string noLeadingSlashPathToMatch = null;
  			
  			if (slash != -1)
  				pathToMatch = pathToMatch.Substring (slash);
  
  			SearchPattern sp = null;
  			foreach (string handlerPath in handlerPaths)
  			{
  				if (handlerPath.Length == 0)
  					continue;
  				
  				if (handlerPath == "*") {
  					result = true;
  					break;
  				}
  
  				string matchExact = null;
  				string endsWith = null;
  
  				if (handlerPath.Length > 0)
  				{
  					if (handlerPath [0] == '*' && (handlerPath.IndexOf ('*', 1) == -1))
  						endsWith = handlerPath.Substring (1);
  
  					if (handlerPath.IndexOf ('*') == -1)
  						if (handlerPath [0] != '/')
  						{
  							HttpContext ctx = HttpContext.Current;
  							HttpRequest req = ctx != null ? ctx.Request : null;
  							string vpath = req != null ? req.BaseVirtualDir : HttpRuntime.AppDomainAppVirtualPath;
  
  							if (vpath == "/")
  								vpath = String.Empty;
  
  							matchExact = String.Concat (vpath, "/", handlerPath);
  						}
  				}
  
  				if (matchExact != null)
  				{
  					result = matchExact.Length == origPathToMatch.Length && StrUtils.EndsWith (origPathToMatch, matchExact, true);
  					if (result == true)
  						break;
  					else
  						continue;
  				}
  				else if (endsWith != null)
  				{
  					result = StrUtils.EndsWith (pathToMatch, endsWith, true);
  					if (result == true)
  						break;
  					else
  						continue;
  				}
  
  				string pattern;
  				if (handlerPath [0] == '/')
  					pattern = handlerPath.Substring (1);
  				else
  					pattern = handlerPath;
  
  				if (sp == null)
  					sp = new SearchPattern (pattern, true);
  				else
  					sp.SetPattern (pattern, true);
  
  				if (noLeadingSlashPathToMatch == null) {
  					if (origPathToMatch [0] == '/')
  						noLeadingSlashPathToMatch = origPathToMatch.Substring (1);
  					else
  						noLeadingSlashPathToMatch = origPathToMatch;
  				}
  
  				if (pattern.IndexOf ('/') >= 0)
  					noLeadingSlashPathToMatch = AdjustPath (pattern, noLeadingSlashPathToMatch);
  
  				if (sp.IsMatch (noLeadingSlashPathToMatch)) {
  					result = true;
  					break;
  				}
  			}
  			
  			return result;
  		}
  
  		static string AdjustPath (string pattern, string path)
  		{
  			int nslashes = 0;
  			foreach (char c in pattern)
  				if (c == '/')
  					nslashes++;
  
  			int i;
  			for (i = path.Length - 1; i >= 0; i--) {
  				if (path [i] == '/') {
  					nslashes--;
  					if (nslashes == -1)
  						break;
  				}
  			}
  
  			if (nslashes >= 0 || i == 0)
  				return path;
  
  
gt: 			return path.Substring (i + 1);