public ActionResult CheckIfUrlIsOk(int articleId)
{
var ok = true;
var metaKey = "x-frame-options-allowed";
var article = FeedService.GetArticle(articleId);
var alreadyChecked = article.GetMetadataValue <bool?>(metaKey);
if (alreadyChecked.HasValue)
{
return(Json(alreadyChecked));
}
try
{
var url = article.Url;
var request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "HEAD";
request.Headers["Accept-Encoding"] = "gzip,deflate";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36";
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
request.KeepAlive = true;
request.Timeout = 10000;
request.MaximumAutomaticRedirections = 3;
request.MaximumResponseHeadersLength = 1024 * 64 * 64;
if (request != null)
{
var response = request.GetResponse() as HttpWebResponse;
var headers = response.Headers;
var xFrameOptions = string.Empty;
if (response != null)
{
response.Close();
}
if (response.Headers != null)
{
xFrameOptions = response.Headers["X-Frame-Options"];
}
if (!xFrameOptions.IsNullOrEmpty())
{
if (xFrameOptions == "deny" ||
xFrameOptions == "SAMEORIGIN" ||
!xFrameOptions.Contains("rssheap"))
{
ok = false;
FeedService.FlagArticle(articleId);
}
}
}
}
catch { }
article.AddMetadata(metaKey, ok);
article.SaveMetadata();
return(Json(ok));
}