/// <summary>
/// Handles the BeginRequest event of the context control.
/// </summary>
/// <param name="sender">The source of the event</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data</param>
private void PreRequestHandlerExecute(object sender, EventArgs e)
{
if (!_configuration.IsCompressionEnabled())
{
return;
}
IHttpCompressionManager compressionManager =
_compressionManager ?? HttpCompressionManager.Current;
HttpContext context = ((HttpApplication)sender).Context;
HttpRequest request = context.Request;
HttpResponse response = context.Response;
string httpMethod = request.HttpMethod;
string currentUrl = request.RawUrl;
if (compressionManager.IsSupportedHttpStatusCode(response.StatusCode) &&
compressionManager.IsSupportedHttpMethod(httpMethod) &&
compressionManager.IsProcessablePage(currentUrl) &&
!request.Path.EndsWith("WebResource.axd", StringComparison.OrdinalIgnoreCase))
{
context.Items["originalResponseFilter"] = response.Filter;
string acceptEncoding = request.Headers["Accept-Encoding"];
response.Filter = new HttpCompressionFilterStream(new HttpResponseWrapper(response),
compressionManager, acceptEncoding);
}
}
public void OnLoad(EventArgs e)
{
if (DisableCompression)
{
return;
}
IHttpCompressionManager compressionManager =
_compressionManager ?? HttpCompressionManager.Current;
HttpContext context = HttpContext.Current;
HttpRequest request = context.Request;
HttpResponse response = context.Response;
string httpMethod = request.HttpMethod;
string currentUrl = request.RawUrl;
if (response.StatusCode == 200 &&
compressionManager.IsSupportedHttpMethod(httpMethod) &&
compressionManager.IsProcessablePage(currentUrl))
{
context.Items["originalResponseFilter"] = response.Filter;
string acceptEncoding = request.Headers["Accept-Encoding"];
response.Filter = new HttpCompressionFilterStream(new HttpResponseWrapper(response),
compressionManager, acceptEncoding);
}
}
/// <summary>
/// Override to compress the content that is generated by an action method
/// </summary>
/// <param name="filterContext">Filter context</param>
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (!_configuration.IsCompressionEnabled())
{
return;
}
IHttpCompressionManager compressionManager =
_compressionManager ?? HttpCompressionManager.Current;
HttpContextBase context = filterContext.HttpContext;
HttpRequestBase request = context.Request;
HttpResponseBase response = context.Response;
string httpMethod = request.HttpMethod;
string currentUrl = request.RawUrl;
if (response.Filter != null && response.StatusCode == 200 &&
compressionManager.IsSupportedHttpMethod(httpMethod) &&
compressionManager.IsProcessablePage(currentUrl))
{
context.Items["originalResponseFilter"] = response.Filter;
string acceptEncoding = request.Headers["Accept-Encoding"];
response.Filter = new HttpCompressionFilterStream(response, compressionManager, acceptEncoding);
}
}
private void Initialize()
{
if (_wrapperInitializedFlag.Set())
{
HttpRequest request = _context.Request;
HttpResponse response = _context.Response;
if (response.StatusCode == 200)
{
string httpMethod = request.Method;
string contentType = response.ContentType;
string mediaType = null;
Encoding encoding = null;
if (contentType != null)
{
MediaTypeHeaderValue mediaTypeHeader;
if (MediaTypeHeaderValue.TryParse(contentType, out mediaTypeHeader))
{
mediaType = mediaTypeHeader.MediaType
#if ASPNETCORE2
.Value
#endif
.ToLowerInvariant()
;
encoding = mediaTypeHeader.Encoding;
}
}
string currentUrl = request.Path.Value;
QueryString queryString = request.QueryString;
if (queryString.HasValue)
{
currentUrl += queryString.Value;
}
IHeaderDictionary responseHeaders = response.Headers;
bool isEncodedContent = responseHeaders.IsEncodedContent();
if (_minificationManagers.Count > 0)
{
foreach (IMarkupMinificationManager minificationManager in _minificationManagers)
{
if (minificationManager.IsSupportedHttpMethod(httpMethod) &&
mediaType != null && minificationManager.IsSupportedMediaType(mediaType) &&
minificationManager.IsProcessablePage(currentUrl))
{
if (isEncodedContent)
{
throw new InvalidOperationException(
string.Format(
AspNetCommonStrings.MarkupMinificationIsNotApplicableToEncodedContent,
responseHeaders[HeaderNames.ContentEncoding]
)
);
}
_currentMinificationManager = minificationManager;
_cachedStream = new MemoryStream();
_minificationEnabled = true;
break;
}
}
}
if (_compressionManager != null && !isEncodedContent &&
_compressionManager.IsSupportedHttpMethod(httpMethod) &&
_compressionManager.IsSupportedMediaType(mediaType) &&
_compressionManager.IsProcessablePage(currentUrl))
{
string acceptEncoding = request.Headers[HeaderNames.AcceptEncoding];
ICompressor compressor = InitializeCurrentCompressor(acceptEncoding);
if (compressor != null)
{
_compressionStream = compressor.Compress(_originalStream);
_compressionEnabled = true;
}
}
_currentUrl = currentUrl;
_encoding = encoding;
}
}
}
public async Task Invoke(HttpContext context)
{
bool useMinification = _options.IsMinificationEnabled() && _minificationManagers.Count > 0;
bool useCompression = _options.IsCompressionEnabled() && _compressionManager != null;
if (!useMinification && !useCompression)
{
await _next.Invoke(context);
return;
}
HttpRequest request = context.Request;
HttpResponse response = context.Response;
using (var cachedStream = new MemoryStream())
{
Stream originalStream = response.Body;
response.Body = cachedStream;
try
{
await _next.Invoke(context);
}
catch (Exception)
{
response.Body = originalStream;
cachedStream.Clear();
throw;
}
byte[] cachedBytes = cachedStream.ToArray();
int cachedByteCount = cachedBytes.Length;
bool isProcessed = false;
response.Body = originalStream;
cachedStream.Clear();
if (cachedByteCount == 0)
{
return;
}
if (response.StatusCode == 200)
{
string httpMethod = request.Method;
string contentType = response.ContentType;
string mediaType = null;
Encoding encoding = null;
if (contentType != null)
{
MediaTypeHeaderValue mediaTypeHeader;
if (MediaTypeHeaderValue.TryParse(contentType, out mediaTypeHeader))
{
mediaType = mediaTypeHeader.MediaType
#if ASPNETCORE2
.Value
#endif
.ToLowerInvariant()
;
encoding = mediaTypeHeader.Encoding;
}
}
encoding = encoding ?? Encoding.GetEncoding(0);
string currentUrl = request.Path.Value;
QueryString queryString = request.QueryString;
if (queryString.HasValue)
{
currentUrl += queryString.Value;
}
string content = encoding.GetString(cachedBytes);
string processedContent = content;
IHeaderDictionary responseHeaders = response.Headers;
bool isEncodedContent = responseHeaders.IsEncodedContent();
Action <string, string> appendHttpHeader = (key, value) =>
{
responseHeaders.Append(key, new StringValues(value));
};
if (useMinification && _options.IsAllowableResponseSize(cachedByteCount))
{
foreach (IMarkupMinificationManager minificationManager in _minificationManagers)
{
if (minificationManager.IsSupportedHttpMethod(httpMethod) &&
mediaType != null && minificationManager.IsSupportedMediaType(mediaType) &&
minificationManager.IsProcessablePage(currentUrl))
{
if (isEncodedContent)
{
throw new InvalidOperationException(
string.Format(
AspNetCommonStrings.MarkupMinificationIsNotApplicableToEncodedContent,
responseHeaders["Content-Encoding"]
)
);
}
IMarkupMinifier minifier = minificationManager.CreateMinifier();
MarkupMinificationResult minificationResult = minifier.Minify(processedContent,
currentUrl, encoding, minificationManager.GenerateStatistics);
if (minificationResult.Errors.Count == 0)
{
processedContent = minificationResult.MinifiedContent;
if (_options.IsPoweredByHttpHeadersEnabled())
{
minificationManager.AppendPoweredByHttpHeader(appendHttpHeader);
}
isProcessed = true;
}
}
if (isProcessed)
{
break;
}
}
}
if (useCompression && !isEncodedContent &&
_compressionManager.IsSupportedHttpMethod(httpMethod) &&
_compressionManager.IsSupportedMediaType(mediaType) &&
_compressionManager.IsProcessablePage(currentUrl))
{
byte[] processedBytes = encoding.GetBytes(processedContent);
using (var inputStream = new MemoryStream(processedBytes))
using (var outputStream = new MemoryStream())
{
string acceptEncoding = request.Headers["Accept-Encoding"];
ICompressor compressor = _compressionManager.CreateCompressor(acceptEncoding);
using (Stream compressedStream = compressor.Compress(outputStream))
{
await inputStream.CopyToAsync(compressedStream);
}
byte[] compressedBytes = outputStream.ToArray();
int compressedByteCount = compressedBytes.Length;
outputStream.Clear();
inputStream.Clear();
responseHeaders["Content-Length"] = compressedByteCount.ToString();
compressor.AppendHttpHeaders(appendHttpHeader);
await originalStream.WriteAsync(compressedBytes, 0, compressedByteCount);
}
isProcessed = true;
}
else
{
if (isProcessed)
{
byte[] processedBytes = encoding.GetBytes(processedContent);
int processedByteCount = processedBytes.Length;
responseHeaders["Content-Length"] = processedByteCount.ToString();
await originalStream.WriteAsync(processedBytes, 0, processedByteCount);
}
}
}
if (!isProcessed)
{
await originalStream.WriteAsync(cachedBytes, 0, cachedByteCount);
}
}
}
