public async Task SaveOrUpdateAsync(TrackBackDto trackBack, ItemType itemType)
{
if (trackBack == null)
{
throw new ArgumentNullException("trackBack", "The trackback must contains an instance.");
}
if (string.IsNullOrEmpty(trackBack.Title))
{
throw new ArgumentException("Invalid trackback title.");
}
if (trackBack.Url == null)
{
throw new ArgumentException("Invalid trackback url.");
}
if (string.IsNullOrEmpty(trackBack.Name))
{
throw new ArgumentException("Invalid trackback name.");
}
if (!string.IsNullOrEmpty(trackBack.Title) && trackBack.ItemId > 0 && !string.IsNullOrEmpty(trackBack.Name) && trackBack.Url != null)
{
ItemDto item;
if (itemType == ItemType.Post)
{
item = this.postDataService.GetPostByKey(trackBack.ItemId);
}
else
{
item = this.pageDataService.GetPageByKey(trackBack.ItemId);
}
if (item == null)
{
throw new DexterItemNotFoundException(trackBack.ItemId);
}
bool firstPingBack = this.trackBackDataService.IsFirstTrackbackBack(trackBack.ItemId, trackBack.Url);
if (!firstPingBack)
{
throw new DuplicateTrackbackException(trackBack.ItemId, trackBack.Url, itemType);
}
bool isSpam = await this.IsSpam(trackBack, item);
if (isSpam)
{
throw new SpamException();
}
}
}
public async Task<ActionResult> Pingback()
{
if (!this.BlogConfiguration.Tracking.EnablePingBackReceive)
{
this.Logger.Debug("PingBack Receive is disabled, returning 404.");
throw new HttpException(404, "Page not found");
}
XmlDocument doc = this.RetrieveXmlDocument();
XmlNodeList list = doc.SelectNodes("methodCall/params/param/value/string") ?? doc.SelectNodes("methodCall/params/param/value");
if (list != null)
{
try
{
string sourceUrl = list[0].InnerText.Trim();
string targetUrl = list[1].InnerText.Trim();
string title = await this.ExamineSourcePage(sourceUrl);
if (string.IsNullOrEmpty(title))
{
this.SendError(16, "The source URI does not exist.");
return new EmptyResult();
}
this.HttpContext.Response.ContentType = "text/xml";
Uri url = new Uri(targetUrl);
string postUrl = url.Segments[url.Segments.Length - 1];
TrackBackDto trackBackDto = new TrackBackDto
{
Url = new Uri(postUrl),
Title = title,
};
await this.trackbackService.SaveOrUpdateAsync(trackBackDto, ItemType.Post);
this.HttpContext.Response.Write("<?xml version=\"1.0\" encoding=\"iso-8859-1\"?><response><error>0</error></response>");
this.HttpContext.Response.End();
}
catch (DuplicateTrackbackException)
{
this.SendError(48, "The pingback has already been registered.");
}
catch (SpamException)
{
this.SendError(17, "The source URI does not contain a link to the target URI, and so cannot be used as a source.");
}
catch (Exception e)
{
this.Logger.Error("Error during saving pingback", e);
this.SendError(0, "Ops, something wrong");
}
}
this.SendError(0, "Ops, something wrong");
return new EmptyResult();
}
public async Task<ActionResult> Trackback(int id, string title, string excerpt, string blog_name, string url, ItemType itemType = ItemType.Post)
{
if (!this.BlogConfiguration.Tracking.EnableTrackBackReceive)
{
this.Logger.Debug("Trackback Receive is disabled, returning 404.");
throw new HttpException(404, "Page not found");
}
BlogConfigurationDto configuration = this.configurationService.GetConfiguration();
if (!configuration.Tracking.EnableTrackBackReceive)
{
return this.HttpNotFound();
}
if (url != null)
{
url = url.Split(',')[0];
}
if (url == null)
{
return this.HttpNotFound();
}
TrackBackDto trackBackDto = new TrackBackDto
{
Url = new Uri(url),
Title = title,
Excerpt = excerpt
};
try
{
await this.trackbackService.SaveOrUpdateAsync(trackBackDto, itemType);
this.HttpContext.Response.Write("<?xml version=\"1.0\" encoding=\"iso-8859-1\"?><response><error>0</error></response>");
this.HttpContext.Response.End();
}
catch (DuplicateTrackbackException)
{
this.HttpContext.Response.Write("<?xml version=\"1.0\" encoding=\"iso-8859-1\"?><response><error>Trackback already registered</error></response>");
this.HttpContext.Response.End();
}
catch (SpamException)
{
this.HttpContext.Response.Write("<?xml version=\"1.0\" encoding=\"iso-8859-1\"?><response><error>The source page does not contain the link</error></response>");
this.HttpContext.Response.End();
}
return new EmptyResult();
}
private async Task<bool> IsSpam(TrackBackDto trackBack, ItemDto item)
{
string response;
using (HttpClient client = new HttpClient())
{
response = await client.GetStringAsync(trackBack.Url);
}
if (string.IsNullOrEmpty(response))
{
return false;
}
SiteUrl postUrl = this.urlBuilder.Post.Permalink(item);
return !response.ToLowerInvariant().Contains(postUrl);
}
public void SaveTrackback(TrackBackDto trackBack, int itemId)
{
if (trackBack == null)
{
throw new ArgumentNullException("trackBack", "The trackBack must be contains a valid instance");
}
if (itemId < 1)
{
throw new ArgumentException("The Id must be greater than 0", "itemId");
}
Post post = this.Session
.Include<Post>(x => x.TrackbacksId)
.Load<Post>(itemId);
if (post == null)
{
throw new DexterPostNotFoundException(itemId);
}
ItemTrackbacks trackbacks = this.Session.Load<ItemTrackbacks>(post.TrackbacksId)
?? new ItemTrackbacks
{
Item = new ItemReference
{
Id = post.Id,
Status = post.Status,
ItemPublishedAt = post.PublishAt
}
};
trackbacks.AddTrackback(trackBack.MapTo<Trackback>(), trackBack.Status);
this.Session.Store(trackbacks);
post.TrackbacksId = trackbacks.Id;
this.Session.Store(post);
}