private Task Serve(IDictionary <string, object> env, string path)
{
Request request = new Request(env);
Response response = new Response(env);
var fileInfo = new FileInfo(path);
var size = fileInfo.Length;
Tuple <long, long> range;
if (!RangeHeader.IsValid(request.Headers))
{
response.StatusCode = OK;
range = new Tuple <long, long>(0, size - 1);
}
else
{
var ranges = RangeHeader.Parse(request.Headers, size);
if (ranges == null)
{
// Unsatisfiable. Return error and file size.
return(Fail(
RequestedRangeNotSatisfiable,
"Byte range unsatisfiable",
"Content-Range", "bytes */" + size)
.Invoke(env));
}
if (ranges.Count() > 1)
{
// TODO: Support multiple byte ranges.
response.StatusCode = OK;
range = new Tuple <long, long>(0, size - 1);
}
else
{
// Partial content
range = ranges.First();
response.StatusCode = PartialContent;
response.Headers.SetHeader("Content-Range", "bytes " + range.Item1 + "-" + range.Item2 + "/" + size);
size = range.Item2 - range.Item1 + 1;
}
}
response.Headers
.SetHeader("Last-Modified", fileInfo.LastWriteTimeUtc.ToHttpDateString())
.SetHeader("Content-Type", Mime.MimeType(fileInfo.Extension, "text/plain"))
.SetHeader("Content-Length", size.ToString(CultureInfo.InvariantCulture));
if ("HEAD".Equals(request.Method, StringComparison.OrdinalIgnoreCase))
{
// Suppress the body.
return(TaskHelpers.Completed());
}
FileBody body = new FileBody(path, range);
//TODO: update for current send file spec
//var req = new Request(env);
//SendFileFunc sendFile = env.Get<SendFileFunc>("sendfile.Func");
//if (sendFile != null)
//{
// return body.Start(sendFile);
//}
return(body.Start(response.OutputStream));
}