<%@ WebHandler Language="C#" Class="VideoFaq.robotshandler" %>
using System;
using System.Web;
using System.Configuration;
using System.Collections.Generic;
using System.Xml;
using App_Code;
using System.IO;

namespace VideoFaq 
{
    public class robotshandler: IHttpHandler 
    {
   
		private static readonly string RobotsProduction = ConfigurationManager.AppSettings["RobotsProduction"].ToString();
		
    
        public void ProcessRequest (HttpContext context) 
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("User-agent: *\r\n");

			 if ((!(ProjectUtility.IsIframedVersion(context))) 
				 && (ProjectUtility.IsRobotsProduction(context)) 
				 && (context.Request.RawUrl.IndexOf("robots.txt", StringComparison.InvariantCultureIgnoreCase) > -1))
            {
				//Valuto se il dominio corrente è aperto ai robots oppure no:
				bool DomainIsOpen = false;
				foreach (KeyValuePair<string, string> pair in StaticObjects.DomainsTableForRobots)
				{
					if (HttpContext.Current.Request.Url.ToString().ToLower().IndexOf(pair.Key.ToLower()) > -1)
					{
						DomainIsOpen = pair.Value == "Y" ? true : false;
						break;
					}
				}
				if (DomainIsOpen)
				{
					PrintBlockedURLs(context, ProjectUtility.GetCurrentApplicationPath());
	                context.Response.Write("Allow: /\r\n");
	            }
	            else
	            {
					context.Response.Write("Disallow: /\r\n");
				}
	            
			}
			else if (context.Request.RawUrl.IndexOf("robots.txt") > -1)
			{
                context.Response.Write("Disallow: /\r\n");
			}
        }

        public bool IsReusable 
        {
            get { return false; }
        }
        
        
        private void PrintBlockedURLs(HttpContext context, string actualDomain)
        {      
			//DEBUG ONLY:
			//actualDomain = "http://videofaq.costakreuzfahrten.de/";
        
        
			//STAMPA DEGLI URL BLOCCATI
			XmlDocument doc = new XmlDocument();
			string xmlFile = context.Server.MapPath("~/ResourcesXml/URLsFilter.xml");
			if (File.Exists(xmlFile))
			{
				try
				{
					doc.Load(xmlFile);
				}
				catch (Exception ex)
				{
					throw new FileLoadException("Error parsing the XML file", xmlFile, ex);
				}
			}
			XmlNodeList nodes = doc.SelectNodes("/Links");
			if (nodes.Count > 0)
			{
				XmlNodeList childs = nodes[0].ChildNodes;
				foreach (XmlNode node in childs)
				{
					//Considero solo quelli del dominio corrente:
					if (node.InnerText.IndexOf(actualDomain) > -1)
					{
						context.Response.Write("Disallow: " + node.InnerText.Replace(actualDomain, "/") + "\r\n");
					}
				}
			}
        }
        
        
    }
}