public override async Task Invoke(IOwinContext context)
{
var contextEnv = context.Environment;
Stream responseStream;
if (!contextEnv.ContainsKey(CommonOwinKeys.AdditionalInfo))
{
PushFunc pushPromise = null;
var path = context.Request.Path.Value;
var base64Req = path.Remove(0, 1); //remove leading /
var isHtmlReq = Regex.Match(base64Req, Base64Regex).Success;
var isJpeg = !isHtmlReq && path.EndsWith(TileExtension);
var url = String.Empty;
if (isHtmlReq)
{
var bingProcessor = new BingRequestProcessor(base64Req);
var images = bingProcessor.GetTilesSoapRequestsUrls();
foreach (var image in images.Where(image => TryGetPushPromise(context, out pushPromise)))
{
Push(context.Request, pushPromise, image);
}
url = BingRequestsUrl + base64Req;
}
else if (isJpeg)
{
url = BingRequestProcessor.GetSoapUrlFromTileName(path);
}
else
{
url = BingServiceUrl + path;
}
if (isHtmlReq)
{
var responseString = new WebClient().DownloadString(url); //html on original request
//TODO handle errors
HtmlProcessor.PreprocessHtml(ref responseString);
var response = Encoding.UTF8.GetBytes(responseString);
responseStream = context.Response.Body;
responseStream.Write(response, 0, response.Length);
}
else
{
DownloadVia11(url, context);
}
}
else
{
var url = context.Get <string>(CommonOwinKeys.AdditionalInfo);
DownloadVia11(url, context);
}
await Next.Invoke(context);
}
