protected override Task SendAsyncInternal(IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
long? length = response.Headers.ContentLength.Value;
if (!length.HasValue || length.Value == 0)
{
return SendFullResponse(response, responseStream, ctx);
}
SetResponseHeaders(response, ctx.Response, Constants.Http.Headers.ContentLength);
ctx.Response.Headers.ContentEncoding.Value = CompressionMethod;
if (!IsBodyRequested(ctx.Request.Method))
return Task.FromResult<object>(null);
var compressedStream = WrapToCompressedStream(ctx.Response.Body);
return SendStreamAsync(responseStream, compressedStream, ctx.CallCancelled)
.ContinueWith(
task =>
{
task.Wait(ctx.CallCancelled);
return compressedStream.FlushAsync(ctx.CallCancelled);
}, TaskContinuationOptions.ExecuteSynchronously)
.Unwrap()
.ContinueWith(
task =>
{
compressedStream.Close();
task.Wait(ctx.CallCancelled);
});
}
public Task SendAsync(IStaticResponse response, Stream responseStream, IOwinContext context)
{
if (response.StatusCode != Constants.Http.StatusCodes.Successful.Ok)
{
return SendFullResponse(response, responseStream, context);
}
return ProcessCacheHeaders(response, responseStream, context) ?? SendAsyncInternal(response, responseStream, context);
}
public IResponseSender CreateSenderFor(IStaticResponse response, IOwinContext context)
{
if (!CanResponseBeCompressed(response))
return new RangedResponseSender();
string compressionMethod = GetClientCompressionMethod(context);
if (compressionMethod == null)
return new RangedResponseSender();
if (string.CompareOrdinal(compressionMethod, "gzip") == 0)
return new GZippedResponseSender();
return new DeflatedResponseSender();
}
private bool CanResponseBeCompressed(IStaticResponse response)
{
if (!compressedContentFilter.IsActive() || response.StatusCode != Constants.Http.StatusCodes.Successful.Ok)
return false;
var propValues = response.Headers.ContentType.PropertyValues;
if (propValues.Length == 0)
return false;
if (compressedContentFilter.Contains(propValues[0].Value))
{
return true;
}
return false;
}
protected override Task SendAsyncInternal(IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
ctx.Response.Headers.AcceptRanges.AddAcceptValue(AllowedRange);
var rangeHeader = ctx.Request.Headers.Range;
if (!rangeHeader.Available)
{
return SendFullResponse(response, responseStream, ctx);
}
var range = rangeHeader.Range;
if (!range.Valid)
{
return SendRequestedRangeNotSatisfiable(ctx, responseStream);
}
var ifRange = ctx.Request.Headers.IfRange;
if (ifRange.Available && !IfRange(ifRange, response.Headers.ETag.Value, response.Headers.LastModified.Value))
{
return SendFullResponse(response, responseStream, ctx);
}
return SendRange(range, response, responseStream, ctx);
}
private static Task SendRange(HttpRange range, IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
long? length = response.Headers.ContentLength.Value;
if (!length.HasValue || length.Value == 0)
{
SendFullResponse(response, responseStream, ctx);
}
long start, end;
// ReSharper disable PossibleInvalidOperationException
long rangeLength = GetRangeLength(range, length.Value, out start, out end);
// ReSharper restore PossibleInvalidOperationException
if (start < 0 || start >= length.Value || end >= length.Value || rangeLength <= 0)
{
return SendRequestedRangeNotSatisfiable(ctx, responseStream);
}
SetResponseHeaders(Constants.Http.StatusCodes.Successful.PartialContent, response.Headers, ctx.Response,
Constants.Http.Headers.ContentLength);
ctx.Response.Headers.ContentRange.Range = new HttpContentRange(start, end, length.Value);
ctx.Response.Headers.ContentLength.Value = rangeLength;
return SendStreamAsync(responseStream, ctx.Response.Body, start, rangeLength, ctx.CallCancelled);
}
protected static void SetResponseHeaders(IStaticResponse staticResponse, IOwinResponse response, params string[] except)
{
SetResponseHeaders(staticResponse.StatusCode, staticResponse.ReasonPhrase, staticResponse.Headers, response, except);
}
protected static Task SendFullResponse(IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
SetResponseHeaders(response, ctx.Response);
return SendStreamAsync(responseStream, ctx.Response.Body, ctx.CallCancelled);
}
private static Task SendPreconditionResult(PreconditionResult result, IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
var cacheStatus = result == PreconditionResult.PreconditionFailed
? Constants.Http.StatusCodes.ClientError.PreconditionFailed
: Constants.Http.StatusCodes.Redirection.NotModified;
return SendCacheStatus(response, responseStream, ctx, cacheStatus);
}
private static Task SendCacheStatus(IStaticResponse response, Stream responseStream, IOwinContext ctx, int statusCode)
{
responseStream.Close();
SetResponseHeaders(statusCode, response.Headers, ctx.Response, Constants.Http.Headers.ContentLength);
return Task.FromResult<object>(null);
}
private static Task ProcessCacheHeaders(IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
PreconditionResult preconditionResult;
var respETag = response.Headers.ETag.Value;
if (!string.IsNullOrEmpty(respETag))
{
preconditionResult = IfMatch(ctx, respETag);
if (preconditionResult != PreconditionResult.Continue)
{
return SendPreconditionResult(preconditionResult, response, responseStream, ctx);
}
preconditionResult = IfNoneMatch(ctx, respETag);
if (preconditionResult != PreconditionResult.Continue)
{
return SendPreconditionResult(preconditionResult, response, responseStream, ctx);
}
}
var lastModified = response.Headers.LastModified.Value;
if (lastModified.HasValue)
{
preconditionResult = IfModifiedSince(ctx, lastModified.Value);
if (preconditionResult != PreconditionResult.Continue)
{
return SendPreconditionResult(preconditionResult, response, responseStream, ctx);
}
preconditionResult = IfUnmodifiedSince(ctx, lastModified.Value);
if (preconditionResult != PreconditionResult.Continue)
{
return SendPreconditionResult(preconditionResult, response, responseStream, ctx);
}
}
return null;
}
protected abstract Task SendAsyncInternal(IStaticResponse response, Stream responseStream, IOwinContext ctx);
private Task ProcessResponseStream(IStaticResponse response, Stream stream, IOwinContext ctx)
{
var sender = responseSenderFactory.CreateSenderFor(response, ctx);
return sender.SendAsync(response, stream, ctx);
}
