/// <summary>
/// Updates a relative silverlight uri to an absolute uri
/// </summary>
/// <param name="baseUri">the uri passed by the client</param>
/// <returns>the updated absolute uri</returns>
private static Uri ConvertToAbsoluteUri(Uri baseUri)
{
if (baseUri == null)
{
return(null);
}
#if ASTORIA_LIGHT
if (!baseUri.IsAbsoluteUri)
{
#if !WINDOWS_PHONE
// If we can use XHR, we will and thus we should use the old (V1) way of determining our
// base URI. That is, use the uri of the HTML page
if (XHRHttpWebRequest.IsAvailable())
{
return(new Uri(System.Windows.Browser.HtmlPage.Document.DocumentUri, baseUri));
}
else
#endif
{
// Otherwise we are going to use the new Client stack. In this case there might not be any
// HTML page hosting us, or it might not be accessible, so the only base uri we can use
// is the base uri of the xap we're running in.
System.Net.WebClient webClient = new System.Net.WebClient();
Uri clientBaseAddress = new Uri(webClient.BaseAddress);
return(new Uri(clientBaseAddress, baseUri));
}
}
#endif
return(baseUri);
}
/// <summary>
/// Determines if a request to the specified URI needs to use the Client HTTP stack
/// or if it should use the XHR HTTP stack.
/// </summary>
/// <param name="uri">The uri for the request</param>
/// <returns>true if the request needs to use the Client HTTP stack, otherwise false</returns>
private static bool UriRequiresClientHttpWebRequest(Uri uri)
{
// If we can use XHR, we will - to maintain backward compat.
// So if we can use XHR technically (DOM Bridge is allowed and we can actually create the XHR object)
// we need to check if running the request through XHR would work, thus we need to figure out if it
// will be considered X-Domain. If it's not X-Domain we will use XHR
// In all other cases (XHR not available because we're Out-Of-Browser, DOM Bridge is not allowed,
// running on a non-UI thread, request would be X-Domain and so on) we will use the client stack always.
if (!XHRHttpWebRequest.IsAvailable())
{
return(true);
}
// Ideally we would use the algorithm from XHR to determine if the request is X-Domain
// because we want to use Client for requests which XHR would mark as X-Domain (and thus fail).
// The best approximation is to compare the request URI to the HTML page URI.
Uri sameDomainUri = System.Windows.Browser.HtmlPage.Document.DocumentUri;
// The request is same-domain only if it has same scheme, same domain and same port
if (sameDomainUri.Scheme != uri.Scheme || sameDomainUri.Port != uri.Port ||
!string.Equals(sameDomainUri.DnsSafeHost, uri.DnsSafeHost, StringComparison.OrdinalIgnoreCase))
{
return(true);
}
return(false);
}
/// <summary>
/// Updates a relative silverlight uri to an absolute uri
/// </summary>
/// <param name="baseUri">the uri passed by the client</param>
/// <returns>the updated absolute uri</returns>
private static Uri ConvertToAbsoluteUri(Uri baseUri)
{
if (baseUri == null)
{
return(null);
}
#if ASTORIA_LIGHT
// If we can use XHR, we will and thus we should use the old (V1) way of determining our
// base URI. That is, use the uri of the HTML page
if (!baseUri.IsAbsoluteUri && XHRHttpWebRequest.IsAvailable())
{
return(new Uri(System.Windows.Browser.HtmlPage.Document.DocumentUri, baseUri));
}
#endif
return(baseUri);
}
