ReferralBlackList.cs :  » Bloggers » dasBlog » newtelligence » DasBlog » Runtime » C# / CSharp Open Source

using System;
using System.Collections;
using System.Text.RegularExpressions;
using System.Web;
using newtelligence.DasBlog.Runtime;
using System.Collections.Generic;

namespace newtelligence.DasBlog.Web.Core{
  /// <summary>
  /// Enumeration used for the return code of <see cref="IBlogDataService.SaveEntry"/>
  /// </summary>
  public enum BlacklistUpdateState
  {
    None, 
    Updated, 
    Failed 
  }

  public interface IBlackList
  {
    void Initialize(string blacklist);
    BlacklistUpdateState UpdateBlacklist();
    Match IsBlacklisted(string url);
  }

  public class ReferralBlackListFactory
  {
    private static Hashtable blacklists = new Hashtable();

    public static void AddBlacklist(IBlackList blackList, string blacklist)
    {
      if (blacklists.ContainsKey(blackList.GetType().Name) == false)
      {
        try
        {
          blackList.Initialize(blacklist);
          blackList.UpdateBlacklist();
          blacklists.Add(blackList.GetType().Name, blackList);
        }
        catch (Exception ex)
        {
          Console.Write(ex.ToString());
        }
      }
      else
      {
        // update the blacklist
        IBlackList referrerBlacklist = blacklists[blackList.GetType().Name] as IBlackList;
        try
        {
          referrerBlacklist.Initialize(blacklist);
          BlacklistUpdateState updateState = referrerBlacklist.UpdateBlacklist();
          
          if (updateState == BlacklistUpdateState.Failed)
          {
            new EventDataItem(EventCodes.Error, blackList.ToString() + " could not be updated: ", "");
          }

        }
        catch (Exception ex)
        {
          Console.Write(ex.ToString());
        }
      }
    }

    public static void RemoveBlacklist(Type type)
    {
      if (blacklists.ContainsKey(type.Name)== true)
      {
        try
        {
          blacklists.Remove(type.Name);
        }
        catch (Exception ex)
        {
          Console.Write(ex.ToString());
        }
      }
    }


    public static IBlackList[] Lists
    {
      get
      {
        List<IBlackList> list = new List<IBlackList>();
        foreach (IBlackList referralBlacklist in blacklists.Values)
        {
          list.Add(referralBlacklist);
        }

        return list.ToArray();
      }
    }
  }
}