AkismetSpamBlockingService.cs :  » Bloggers » dasBlog » newtelligence » DasBlog » Web » Core » C# / CSharp Open Source

using System;
using newtelligence.DasBlog.Runtime;
using Subtext.Akismet;
using AkismetCommentSubtext.Akismet.Comment;

namespace newtelligence.DasBlog.Web.Core{
  /// <summary>
  /// Uses the Akismet service to determine if a comment is SPAM
  /// </summary>
  /// <remarks>http://akismet.com/</remarks>
  public class AkismetSpamBlockingService : ISpamBlockingService
  {
    AkismetClient akismetClient;

    public AkismetSpamBlockingService(string apiKey, string blogUrl)
    {
      akismetClient = new AkismetClient(apiKey, new Uri(blogUrl));  
    }

    public bool IsSpam(IFeedback feedback)
    {
      IComment akismetFormattedComment = ConvertToAkismetComment(feedback);
      return akismetClient.CheckCommentForSpam(akismetFormattedComment);
    }

    public void ReportSpam(IFeedback feedback)
    {
      IComment akismetFormattedComment = ConvertToAkismetComment(feedback);
      akismetClient.SubmitSpam(akismetFormattedComment);
    }

    public void ReportNotSpam(IFeedback feedback)
    {
      IComment akismetFormattedComment = ConvertToAkismetComment(feedback);
      akismetClient.SubmitHam(akismetFormattedComment);
    }

    private AkismetComment ConvertToAkismetComment(IFeedback feedback)
    {
      System.Net.IPAddress ipAddress = System.Net.IPAddress.None;
      if (feedback.AuthorIPAddress != null)
      {
        try 
        {
          ipAddress = System.Net.IPAddress.Parse(feedback.AuthorIPAddress);
        }
        catch(FormatException){}
      }
      AkismetComment comment = new AkismetComment(ipAddress, feedback.AuthorUserAgent);
      comment.Author = feedback.Author;
      comment.AuthorEmail = feedback.AuthorEmail;
      if (feedback.AuthorHomepage != null && feedback.AuthorHomepage.Length > 0)
      {
        try 
        {
          comment.AuthorUrl = new Uri(feedback.AuthorHomepage);
        }
        catch(UriFormatException){}      
      }
      comment.Content = feedback.Content;
      comment.Referer = feedback.Referer;
      if (feedback.TargetEntryId != null & feedback.TargetEntryId.Trim().Length > 0)
      {
        try 
        {
          comment.Permalink = new Uri(SiteUtilities.GetPermaLinkUrl(feedback.TargetEntryId));
        }
        catch(UriFormatException){}
      }
      comment.CommentType = feedback.FeedbackType;
      return comment;
    }

  }
}