public async Task GetImage(string url, string options)
{
Uri uri;
if (Uri.TryCreate(url, UriKind.Absolute, out uri))
{
DownloadRequest request = new DownloadRequest
{
Url = uri,
ReferrerUrl = Request.UrlReferrer,
UserAgent = Request.UserAgent,
Options = options.FilterOptions()
};
Task<Tuple<MimeTypes, string>> processTask = ImageTracker.ProcessRequest(request);
Tuple<MimeTypes, string> result = await processTask;
Response.PublicCache(60);
if (result != null)
{
Response.WriteFile(result.Item2);
Response.ContentType = result.Item1.ToString();
}
else
{
HttpWebRequest httpWebRequest = (HttpWebRequest) WebRequest.Create(uri);
using (HttpWebResponse httpWebResponse = (HttpWebResponse) httpWebRequest.GetResponse())
using (Stream stream = httpWebResponse.GetResponseStream())
{
if (stream != Stream.Null)
{
Response.BinaryWrite(StreamHelper.ReadToEnd(stream));
Response.ContentType = Utility.Helper.GetImageType(request).Item1.ToString();
}
}
}
}
else
Response.Redirect("~/Error");
}
public async Task<Tuple<MimeTypes, string>> ProcessRequest(DownloadRequest request)
{
return await Task.Factory.StartNew(() => ProcessAsync(request));
}
private static Tuple<MimeTypes, string> ProcessAsync(DownloadRequest request)
{
if (string.IsNullOrEmpty(request.Options))
{
if (_savedImages.Exists(request.Url.ToString(), SAVED_IMAGE_SECTION))
return DecideWhichImageToUse(request, _savedImages.Get<DownloadResponse>(request.Url.ToString(), SAVED_IMAGE_SECTION));
}
else
{
if (_customImages.Exists(request.Url + request.Options, CUSTOM_IMAGES_SECTION))
return _customImages.Get<DownloadResponse>(request.Url + request.Options, CUSTOM_IMAGES_SECTION).ImageLocations[ImageSizes.Default];
}
DownloadResponse response = DownloadProcess.Download(request);
if (response != null)
{
if (!string.IsNullOrEmpty(request.Options))
{
if (!_customImages.Exists(request.Url + request.Options, CUSTOM_IMAGES_SECTION))
_customImages.Add(request.Url + request.Options, response, CUSTOM_IMAGES_SECTION);
return response.ImageLocations[ImageSizes.Default];
}
if (!_savedImages.Exists(request.Url.ToString(), SAVED_IMAGE_SECTION))
_savedImages.Add(request.Url.ToString(), response, SAVED_IMAGE_SECTION);
return DecideWhichImageToUse(request, response);
}
return null;
}
private static Tuple<MimeTypes, string> DecideWhichImageToUse(DownloadRequest request, DownloadResponse response)
{
ImageSizes imageSize = _deviceServices.GetImageSize(request.UserAgent);
return response.ImageLocations[imageSize];
}
public static Tuple<ImageFormat, string> GetImageType(DownloadRequest request)
{
string imageName = request.Url.Segments[request.Url.Segments.Length - 1];
imageName = imageName.ToLower();
return DecideImageFormat(imageName);
}