ITfoxtec SAML 2.0 and ASP.NET Web Forms (ASPX) HttpRequest - itfoxtec-identity-saml2

Question

I am trying to implement ITfoxtec SAML 2.0 in an ASP.NET Web Forms (ASPX) application.
The usual ASP.NET MVC implementation uses the statement:
binding.ReadSamlResponse(Request.ToGenericHttpRequest(), saml2AuthnResponse);
but the MVC Request is not available in Web Forms.
In VB I have tried code such as
Dim request As New ITfoxtec.Identity.Saml2.Http.HttpRequest
request.Method = "GET"
request.Query = HttpContext.Current.Request.Form
binding.ReadSamlResponse(request, saml2AuthnResponse)
but this raises the exception:
Found invalid data while decoding.
at System.IO.Compression.InflaterZlib.Inflate(FlushCode flushCode)
at System.IO.Compression.InflaterZlib.ReadInflateOutput(Byte[] outputBuffer, Int32 offset, Int32 length, FlushCode flushCode, Int32& bytesRead)
at System.IO.Compression.InflaterZlib.Inflate(Byte[] bytes, Int32 offset, Int32 length)
at System.IO.Compression.DeflateStream.Read(Byte[] array, Int32 offset, Int32 count)
at System.IO.Stream.InternalCopyTo(Stream destination, Int32 bufferSize)
at System.IO.Stream.CopyTo(Stream destination)
at ITfoxtec.Identity.Saml2.Saml2RedirectBinding.DecompressResponse(String value)
at ITfoxtec.Identity.Saml2.Saml2RedirectBinding.Read(HttpRequest request, Saml2Request saml2RequestResponse, String messageName, Boolean validateXmlSignature, Boolean detectReplayedTokens)
at ITfoxtec.Identity.Saml2.Saml2Binding`1.ReadSamlResponse(HttpRequest request, Saml2Response saml2Response)
at [my code]
How can I convert HttpContext.Current.Request to ITfoxtec.Identity.Saml2.Http.HttpRequest?
Hoping for assistance,
David.

Answer 1

Thank you Anders.
The issue I had occurred because I had inadvertantly declared binding as Saml2RedirectBinding instead of Saml2PostBinding. With this corrected, the ASP.NET MVC C# statement:
binding.ReadSamlResponse(Request.ToGenericHttpRequest(), saml2AuthnResponse);
needs to be as follows for ASP.NET Web Forms in VB:
Dim request As New ITfoxtec.Identity.Saml2.Http.HttpRequest With
{
.Method = HttpContext.Current.Request.HttpMethod,
.Form = HttpContext.Current.Request.Form,
.Query = New NameValueCollection,
.QueryString = ""
}
binding.ReadSamlResponse(request, saml2AuthnResponse)
in case anyone else needs this solution.
David.

Answer 2

You probably need to convert the HttpContext.Current.Request.QueryString into a new list.
Maybe something like this:
public static class HttpRequestExtensions
{
public static Http.HttpRequest ToGenericHttpRequest(this HttpRequest request)
{
return new Http.HttpRequest
{
Method = "GET",
QueryString = ToQueryString(HttpContext.Current.Request.RawUrl),
Query = ToNameValueCollection(HttpContext.Current.Request.QueryString)
};
}
private static string ToQueryString(string rawUrl)
{
// TODO Return the queryString....
return queryString;
}
private static NameValueCollection ToNameValueCollection(??? queryString)
{
var nv = new NameValueCollection();
foreach (var item in queryString)
{
nv.Add(item.Key, item.Value.First());
}
return nv;
}
}
Code from:
https://github.com/ITfoxtec/ITfoxtec.Identity.Saml2/blob/master/src/ITfoxtec.Identity.Saml2.MvcCore/Extensions/HttpRequestExtensions.cs