private static WebResponse RequestExternalResource(WebRequest request, ExternalResourceAbortHelper abortHelper)
{
if (abortHelper == null)
{
return(request.GetResponse());
}
IAsyncResult asyncResult = request.BeginGetResponse(null, null);
while (!asyncResult.AsyncWaitHandle.WaitOne(1000, exitContext: false))
{
if (abortHelper.IsAborted)
{
request.Abort();
}
}
return(request.EndGetResponse(asyncResult));
}
public static byte[] GetExternalResource(string resourceUrl, bool impersonate, string surrogateUser, string surrogatePassword, string surrogateDomain, int webTimeout, int maxResourceSizeBytes, ExternalResourceAbortHelper abortHelper, out string mimeType, out bool resourceExceededMaxSize)
{
byte[] result = null;
mimeType = null;
Uri uri = new Uri(resourceUrl);
WebRequest webRequest = (!uri.IsFile) ? ((WebRequest)(HttpWebRequest)WebRequest.Create(uri)) : ((WebRequest)(FileWebRequest)WebRequest.Create(uri));
int timeout = 600000;
if (webTimeout > 0 && webTimeout < 2147483)
{
webRequest.Timeout = webTimeout * 1000;
}
else
{
webRequest.Timeout = timeout;
}
if (surrogateUser != null)
{
webRequest.Credentials = new NetworkCredential(surrogateUser, surrogatePassword, surrogateDomain);
}
else if (impersonate)
{
webRequest.Credentials = CredentialCache.DefaultCredentials;
}
else
{
webRequest.Credentials = null;
}
resourceExceededMaxSize = false;
using (WebResponse webResponse = RequestExternalResource(webRequest, abortHelper))
{
mimeType = webResponse.ContentType;
using (Stream s = webResponse.GetResponseStream())
{
result = ((maxResourceSizeBytes != MaxResourceSizeUnlimited) ? StreamSupport.ReadToEndNotUsingLength(s, 1024, maxResourceSizeBytes, out resourceExceededMaxSize) : StreamSupport.ReadToEndNotUsingLength(s, 1024));
}
}
if (uri.IsFile && !resourceExceededMaxSize)
{
string text = Path.GetExtension(uri.LocalPath).ToUpperInvariant();
if (text != null && text.StartsWith(".", StringComparison.Ordinal))
{
text = text.Substring(1);
}
string mimeTypeByRegistryLookup = GetMimeTypeByRegistryLookup(text);
if (mimeTypeByRegistryLookup != null)
{
mimeType = mimeTypeByRegistryLookup;
}
}
return(result);
}