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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.IO;
using System.Text;
using System.IO.Compression;
using Signum.Utilities;
namespace Signum.Web.PortableAreas
{
public class StaticContentResult : ActionResult
{
public string ContentType { get; set; }
public TimeSpan CacheDuration = TimeSpan.FromDays(10);
public byte[] Compressed { get; private set; }
public byte[] Uncompressed { get; private set; }
public StaticContentResult(byte[] uncompressedContent, string fileName)
{
this.ContentType = MimeType.FromFileName(fileName);
this.Uncompressed = uncompressedContent;
}
public override void ExecuteResult(ControllerContext context)
{
HttpResponseBase response = context.HttpContext.Response;
HttpRequestBase request = context.HttpContext.Request;
response.AppendHeader("Vary", "Accept-Encoding");
response.Cache.SetCacheability(HttpCacheability.Public);
response.Cache.SetMaxAge(CacheDuration);
if (!VersionChanged(request, ScriptHtmlHelper.Manager.LastModified))
{
response.StatusCode = 304;
response.SuppressContent = true;
return;
}
bool canGZip = CanGZip(context.HttpContext.Request);
byte[] bytes = canGZip ? (Compressed ?? (Compressed = Compress())) : Uncompressed;
response.AppendHeader("Content-Length", bytes.Length.ToString());
if (canGZip)
response.AppendHeader("Content-Encoding", "gzip");
response.Cache.SetLastModified(ScriptHtmlHelper.Manager.LastModified);
response.ContentType = ContentType;
response.OutputStream.Write(bytes, 0, bytes.Length);
}
private bool VersionChanged(HttpRequestBase request, DateTime contentModified)
{
string header = request.Headers["If-Modified-Since"];
if (header != null)
{
DateTime isModifiedSince;
if (DateTime.TryParse(header, out isModifiedSince))
{
return contentModified > isModifiedSince;
}
}
return true;
}
private byte[] Compress()
{
using (MemoryStream memoryStream = new MemoryStream(8092))
{
using (GZipStream stream = new GZipStream(memoryStream, CompressionMode.Compress))
{
using (MemoryStream uncompressedStream = new MemoryStream(Uncompressed))
{
uncompressedStream.CopyTo(stream);
}
}
return memoryStream.ToArray();
}
}
private bool CanGZip(HttpRequestBase request)
{
string acceptEncoding = request.Headers["Accept-Encoding"];
if (!string.IsNullOrEmpty(acceptEncoding) &&
(acceptEncoding.Contains("gzip") || acceptEncoding.Contains("deflate")))
return true;
return false;
}
}
}
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I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
www.signumframework.com
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...