/
MarkupMinificationFilterStream.cs
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/
MarkupMinificationFilterStream.cs
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using System;
using System.IO;
using System.Text;
using System.Web;
using WebMarkupMin.AspNet.Common;
using WebMarkupMin.AspNet4.Common.Helpers;
using WebMarkupMin.Core;
using WebMarkupMin.Core.Utilities;
using AspNetCommonStrings = WebMarkupMin.AspNet.Common.Resources.Strings;
namespace WebMarkupMin.AspNet4.Common
{
/// <summary>
/// Markup minification response filter
/// </summary>
public sealed class MarkupMinificationFilterStream : Stream
{
/// <summary>
/// HTTP response
/// </summary>
private readonly HttpResponseBase _response;
/// <summary>
/// Original stream
/// </summary>
private readonly Stream _originalStream;
/// <summary>
/// Stream that original content is read into
/// </summary>
private MemoryStream _cachedStream = new MemoryStream();
/// <summary>
/// WebMarkupMin configuration
/// </summary>
private readonly WebMarkupMinConfiguration _configuration;
/// <summary>
/// Markup minification manager
/// </summary>
private readonly IMarkupMinificationManager _minificationManager;
/// <summary>
/// Current URL
/// </summary>
private readonly string _currentUrl;
/// <summary>
/// Text encoding
/// </summary>
private readonly Encoding _encoding;
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return true; }
}
public override bool CanWrite
{
get { return true; }
}
public override long Length
{
get { return 0; }
}
public override long Position
{
get;
set;
}
/// <summary>
/// Constructs a instance of markup minification response filter
/// </summary>
/// <param name="response">HTTP response</param>
/// <param name="configuration">WebMarkupMin configuration</param>
/// <param name="minificationManager">Markup minification manager</param>
public MarkupMinificationFilterStream(HttpResponseBase response,
WebMarkupMinConfiguration configuration,
IMarkupMinificationManager minificationManager)
: this(response, configuration, minificationManager, string.Empty, TargetFrameworkShortcuts.DefaultTextEncoding)
{ }
/// <summary>
/// Constructs a instance of markup minification response filter
/// </summary>
/// <param name="response">HTTP response</param>
/// <param name="configuration">WebMarkupMin configuration</param>
/// <param name="minificationManager">Markup minification manager</param>
/// <param name="currentUrl">Current URL</param>
/// <param name="encoding">Text encoding</param>
public MarkupMinificationFilterStream(HttpResponseBase response,
WebMarkupMinConfiguration configuration,
IMarkupMinificationManager minificationManager,
string currentUrl,
Encoding encoding)
{
_response = response;
_originalStream = response.Filter;
_configuration = configuration;
_minificationManager = minificationManager;
_currentUrl = currentUrl;
_encoding = encoding;
}
public override int Read(byte[] buffer, int offset, int count)
{
return _originalStream.Read(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
return _originalStream.Seek(offset, origin);
}
public override void SetLength(long value)
{
_originalStream.SetLength(value);
}
public override void Write(byte[] buffer, int offset, int count)
{
_cachedStream.Write(buffer, 0, count);
}
public override void Flush()
{
_originalStream.Flush();
}
public override void Close()
{
bool isEncodedContent = HttpHeadersHelpers.IsEncodedContent(_response.Headers);
if (!isEncodedContent)
{
byte[] cachedBytes = _cachedStream.ToArray();
int cachedByteCount = cachedBytes.Length;
bool isMinified = false;
if (_configuration.IsAllowableResponseSize(cachedByteCount))
{
string content = _encoding.GetString(cachedBytes);
IMarkupMinifier minifier = _minificationManager.CreateMinifier();
MarkupMinificationResult minificationResult = minifier.Minify(content,
_currentUrl, _encoding, _minificationManager.GenerateStatistics);
if (minificationResult.Errors.Count == 0)
{
if (_configuration.IsPoweredByHttpHeadersEnabled())
{
_minificationManager.AppendPoweredByHttpHeader((key, value) =>
{
_response.Headers[key] = value;
});
}
using (var writer = new StreamWriter(_originalStream, _encoding))
{
writer.Write(minificationResult.MinifiedContent);
}
isMinified = true;
}
}
if (!isMinified)
{
_cachedStream.Seek(0, SeekOrigin.Begin);
_cachedStream.CopyTo(_originalStream);
}
}
_cachedStream.Clear();
_originalStream.Close();
if (isEncodedContent)
{
throw new InvalidOperationException(
string.Format(
AspNetCommonStrings.MarkupMinificationIsNotApplicableToEncodedContent,
_response.Headers["Content-Encoding"]
)
);
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_cachedStream != null)
{
_cachedStream.Dispose();
_cachedStream = null;
}
_originalStream.Dispose();
}
base.Dispose(disposing);
}
}
}