/// <summary>
/// Generates a value for HTTP header "ETag" based on
/// information about processed asset
/// </summary>
/// <param name="assetContent">Text content of asset</param>
/// <returns>ETag value</returns>
private static string GenerateAssetETag(string assetContent)
{
string str;
using (SHA256 hashAlgorithm = AssetHandlerBase.CreateHashAlgorithm())
str = HttpServerUtility.UrlTokenEncode(hashAlgorithm.ComputeHash(Encoding.Unicode.GetBytes(assetContent)));
return(string.Format("\"{0}\"", (object)str));
}
public void ProcessRequest(HttpContextBase context)
{
this._context = context;
HttpRequestBase request = context.Request;
HttpResponseBase response = context.Response;
Uri url = request.Url;
string str = !(url == (Uri)null) ? url.LocalPath : throw new HttpException(500, BundleTransformer.Core.Resources.Strings.Common_ValueIsNull);
if (string.IsNullOrWhiteSpace(str))
{
throw new HttpException(500, BundleTransformer.Core.Resources.Strings.Common_ValueIsEmpty);
}
if (!this._virtualFileSystemWrapper.FileExists(str))
{
throw new HttpException(404, string.Format(BundleTransformer.Core.Resources.Strings.Common_FileNotExist, (object)str));
}
string bundleVirtualPath = request.QueryString[Common.BundleVirtualPathQueryStringParameterName];
if (string.IsNullOrWhiteSpace(bundleVirtualPath) && this.IsStaticAsset)
{
AssetHandlerBase.ProcessStaticAssetRequest(context);
}
else
{
string processedAssetContent;
try
{
processedAssetContent = this.GetProcessedAssetContent(str, bundleVirtualPath);
}
catch (HttpException ex)
{
throw;
}
catch (AssetTranslationException ex)
{
throw new HttpException(500, ex.Message, (Exception)ex);
}
catch (AssetPostProcessingException ex)
{
throw new HttpException(500, ex.Message, (Exception)ex);
}
catch (FileNotFoundException ex)
{
throw new HttpException(500, string.Format(BundleTransformer.Core.Resources.Strings.AssetHandler_DependencyNotFound, (object)ex.Message, (object)ex));
}
catch (Exception ex)
{
throw new HttpException(500, string.Format(BundleTransformer.Core.Resources.Strings.AssetHandler_UnknownError, (object)ex.Message, (object)ex));
}
HttpCachePolicyBase cache = response.Cache;
if (this._assetHandlerConfig.DisableClientCache)
{
response.StatusCode = 200;
response.StatusDescription = "OK";
cache.SetCacheability(HttpCacheability.NoCache);
cache.SetExpires(DateTime.UtcNow.AddYears(-1));
cache.SetValidUntilExpires(false);
cache.SetNoStore();
cache.SetNoServerCaching();
response.ContentType = this.ContentType;
response.Write(processedAssetContent);
}
else
{
string assetEtag = AssetHandlerBase.GenerateAssetETag(processedAssetContent);
int num = AssetHandlerBase.IsETagHeaderChanged(request, assetEtag) ? 1 : 0;
if (num != 0)
{
response.StatusCode = 200;
response.StatusDescription = "OK";
}
else
{
response.StatusCode = 304;
response.StatusDescription = "Not Modified";
response.AddHeader("Content-Length", "0");
}
response.AddHeader("X-Asset-Transformation-Powered-By", "Bundle Transformer");
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.UtcNow.AddYears(-1));
cache.SetValidUntilExpires(true);
cache.AppendCacheExtension("must-revalidate");
cache.SetNoServerCaching();
cache.VaryByHeaders["If-None-Match"] = true;
cache.SetETag(assetEtag);
if (num != 0)
{
response.ContentType = this.ContentType;
response.Write(processedAssetContent);
}
}
context.ApplicationInstance.CompleteRequest();
}
}
