private static void SendResponse(Stream f, string FullPath, string ContentType, bool IsDynamic, string ETag, DateTime LastModified,
HttpResponse Response)
{
ReadProgress Progress = new ReadProgress()
{
Response = Response,
f = f ?? File.OpenRead(FullPath),
Next = null,
Boundary = null,
ContentType = null
};
Progress.BytesLeft = Progress.TotalLength = Progress.f.Length;
Progress.BlockSize = (int)Math.Min(BufferSize, Progress.BytesLeft);
Progress.Buffer = new byte[Progress.BlockSize];
Response.ContentType = ContentType;
Response.ContentLength = Progress.TotalLength;
if (!IsDynamic)
{
Response.SetHeader("ETag", ETag);
Response.SetHeader("Last-Modified", CommonTypes.EncodeRfc822(LastModified));
}
if (Response.OnlyHeader || Progress.TotalLength == 0)
{
Response.SendResponse();
Progress.Dispose();
}
else
{
Task T = Progress.BeginRead();
}
}
/// <summary>
/// Executes the ranged GET method on the resource.
/// </summary>
/// <param name="Request">HTTP Request</param>
/// <param name="Response">HTTP Response</param>
/// <param name="FirstInterval">First byte range interval.</param>
/// <exception cref="HttpException">If an error occurred when processing the method.</exception>
public async Task GET(HttpRequest Request, HttpResponse Response, ByteRangeInterval FirstInterval)
{
string FullPath = this.GetFullPath(Request);
if (File.Exists(FullPath))
{
HttpRequestHeader Header = Request.Header;
DateTime LastModified = File.GetLastWriteTime(FullPath).ToUniversalTime();
DateTimeOffset? Limit;
CacheRec Rec;
if (Header.IfRange != null && (Limit = Header.IfRange.Timestamp).HasValue &&
!LessOrEqual(LastModified, Limit.Value.ToUniversalTime()))
{
Response.StatusCode = 200;
await this.GET(Request, Response); // No ranged request.
return;
}
Rec = this.CheckCacheHeaders(FullPath, LastModified, Request);
string ContentType = InternetContent.GetContentType(Path.GetExtension(FullPath));
Stream f = CheckAcceptable(Request, Response, ref ContentType, out bool Dynamic, FullPath, Request.Header.Resource);
Rec.IsDynamic = Dynamic;
if (Response.ResponseSent)
{
return;
}
ReadProgress Progress = new ReadProgress()
{
Response = Response,
Request = Request,
f = f ?? File.Open(FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)
};
ByteRangeInterval Interval = FirstInterval;
Progress.TotalLength = Progress.f.Length;
long i = 0;
long j;
long First;
if (FirstInterval.First.HasValue)
{
First = FirstInterval.First.Value;
}
else
{
First = Progress.TotalLength - FirstInterval.Last.Value;
}
Progress.f.Position = First;
Progress.BytesLeft = Interval.GetIntervalLength(Progress.TotalLength);
Progress.Next = Interval.Next;
while (Interval != null)
{
j = Interval.GetIntervalLength(Progress.TotalLength);
if (j > i)
{
i = j;
}
Interval = Interval.Next;
}
Progress.BlockSize = (int)Math.Min(BufferSize, i);
Progress.Buffer = new byte[Progress.BlockSize];
if (FirstInterval.Next is null)
{
Progress.Boundary = null;
Progress.ContentType = null;
Response.ContentType = ContentType;
Response.ContentLength = FirstInterval.GetIntervalLength(Progress.f.Length);
Response.SetHeader("Content-Range", ContentByteRangeInterval.ContentRangeToString(First, First + Progress.BytesLeft - 1, Progress.TotalLength));
}
else
{
Progress.Boundary = Guid.NewGuid().ToString().Replace("-", string.Empty);
Progress.ContentType = ContentType;
Response.ContentType = "multipart/byteranges; boundary=" + Progress.Boundary;
// chunked transfer encoding will be used
}
if (!Rec.IsDynamic)
{
Response.SetHeader("ETag", Rec.ETag);
Response.SetHeader("Last-Modified", CommonTypes.EncodeRfc822(LastModified));
}
if (Response.OnlyHeader || Progress.BytesLeft == 0)
{
await Response.SendResponse();
await Progress.Dispose();
}
else
{
if (FirstInterval.Next != null)
{
await Response.WriteLine();
await Response.WriteLine("--" + Progress.Boundary);
await Response.WriteLine("Content-Type: " + Progress.ContentType);
await Response.WriteLine("Content-Range: " + ContentByteRangeInterval.ContentRangeToString(First, First + Progress.BytesLeft - 1, Progress.TotalLength));
await Response.WriteLine();
}
Task _ = Progress.BeginRead();
}
}
else
{
await this.RaiseFileNotFound(FullPath, Request, Response);
}
}