async public Task FilterAsync(HttpRequest Request, HttpResponse Response)
{
var FilePath = Request.Url.Path;
if (Path.GetExtension(FilePath) == "")
{
if (Directory.Exists(FilePath))
{
FilePath = Url.Normalize(FilePath + "/index.html");
}
}
//var CacheKey = FilePath.ToLowerInvariant();
//var CacheKey = FilePath;
var CachedResult = await Cache.GetAsync(FilePath, async () =>
{
var Extension = Path.GetExtension(FilePath);
if (ExtensionHandlersAsync.ContainsKey(Extension))
{
try
{
return await ExtensionHandlersAsync[Extension](new HandlerStruct(this)
{
FileSystem = VirtualFileSystem,
FilePath = FilePath,
});
}
catch (FileNotFoundException)
{
throw (new HttpException(HttpCode.NOT_FOUND_404));
}
}
if (Cache.Enabled)
{
await Console.Out.WriteLineAsync(String.Format("Caching '{0}'", FilePath));
}
var FileInfo = await VirtualFileSystem.GetFileInfoAsync(FilePath);
if (FileInfo.Exists)
{
bool ShouldCacheInMemory = FileInfo.Length <= CacheSizeThresold;
string ETag = null;
byte[] Data = null;
if (ShouldCacheInMemory)
{
Data = await VirtualFileSystem.ReadAsBytesAsync(FilePath);
ETag = BitConverter.ToString(MD5.Create().ComputeHash(Data));
}
return new ResultStruct()
{
RealFilePath = FilePath,
ContentType = MimeType.GetFromPath(FilePath),
FileInfo = FileInfo,
ETag = ETag,
Data = Data,
Exists = true,
};
}
else
{
throw (new HttpException(HttpCode.NOT_FOUND_404));
}
});
Response.Headers["Content-Type"] = CachedResult.ContentType;
if (CachedResult.ETag != null)
{
Response.Headers["ETag"] = CachedResult.ETag;
}
Response.Headers["Date"] = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
Response.Headers["Last-Modified"] = CachedResult.FileInfo.LastWriteTimeUtc.ToString("R", CultureInfo.InvariantCulture);
Response.Headers["Cache-Control"] = "max-age=2419200, private";
Response.Headers["Expires"] = "Wed, 11 Apr 2022 18:23:41 GMT";
// Check ETag
if (Request.Headers["If-None-Match"] != "")
{
if (Request.Headers["If-None-Match"] == CachedResult.ETag)
{
throw(new HttpException(HttpCode.NOT_MODIFIED_304));
}
}
// Check Last-Modified
if (Request.Headers["If-Modified-Since"] != "")
{
var RequestIfModifiedSince = DateTime.ParseExact(Request.Headers["If-Modified-Since"], "R", CultureInfo.InvariantCulture);
if (RequestIfModifiedSince == CachedResult.FileInfo.LastWriteTimeUtc)
{
throw(new HttpException(HttpCode.NOT_MODIFIED_304));
}
}
Response.Buffering = true;
Response.ChunkedTransferEncoding = false;
/*
Cache-Control:max-age=2419200, private
Connection:keep-alive
Date:Wed, 14 Mar 2012 14:52:54 GMT
Expires:Wed, 11 Apr 2012 14:52:54 GMT
Last-Modified:Wed, 11 Jan 2012 13:52:46 GMT
*/
Response.Headers["Content-Length"] = CachedResult.FileInfo.Length.ToString();
// Cached byte[]
if (CachedResult.Data != null)
{
await Response.WriteAsync(CachedResult.Data);
}
// No cached byte[], stream the file
else
{
Response.Buffering = false;
//Response.ChunkedTransferEncoding = true;
await Response.StreamFileASync(CachedResult.RealFilePath);
}
}
