Subtext.Framework.Format.UrlFormats.GetUriReferrerSafe C# (CSharp) Method

UrlFormats Class Documentation Exibir arquivo Open project: ayende/Subtext

GetUriReferrerSafe() public static method

From Jason Block @ http://www.angrycoder.com/article.aspx?cid=5&y=2003&m=4&d=15 Basically, it's [Request.UrlReferrer] doing a lazy initialization of its internal _referrer field, which is a Uri-type class. That is, it's not created until it's needed. The point is that there are a couple of spots where the UriFormatException could leak through. One is in the call to GetKnownRequestHeader(). _wr is a field of type HttpWorkerRequest. 36 is the value of the HeaderReferer constant - since that's being blocked in this case, it may cause that exception to occur. However, HttpWorkerRequest is an abstract class, and it took a trip to the debugger to find out that _wr is set to a System.Web.Hosting.ISAPIWorkerRequestOutOfProc object. This descends from System.Web.Hosting.ISAPIWorkerRequest, and its implementation of GetKnownRequestHeader() didn't seem to be the source of the problem.

public static GetUriReferrerSafe ( HttpRequest request ) : Uri
request	System.Web.HttpRequest
return	System.Uri

        public static Uri GetUriReferrerSafe(HttpRequest request)
        {
            try
            {
                return request.UrlReferrer;
            }
            catch(UriFormatException)
            {
                return null;
            }
        }

UrlFormats

AdminUrl

AggBugkUrl

ArticleCategoryUrl

ArticleUrl

CommentApiUrl

CommentRssUrl

DateFromUrl

DayUrl

EntryFullyQualifiedUrl

EntryUrl

FeedbackFullyQualifiedUrl