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//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.server.handler.gzip;
import java.io.IOException;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.zip.Deflater;
import jakarta.servlet.DispatcherType;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.CompressedContentFormat;
import org.eclipse.jetty.http.HttpField;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.http.PreEncodedHttpField;
import org.eclipse.jetty.http.pathmap.PathSpecSet;
import org.eclipse.jetty.server.HttpOutput;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.HandlerWrapper;
import org.eclipse.jetty.util.AsciiLowerCaseSet;
import org.eclipse.jetty.util.IncludeExclude;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.compression.CompressionPool;
import org.eclipse.jetty.util.compression.DeflaterPool;
import org.eclipse.jetty.util.compression.InflaterPool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A Handler that can dynamically GZIP uncompress requests, and compress responses.
*
* The GzipHandler can be applied to the entire server (a {@code gzip.mod} is included in
* the {@code jetty-home}) or it may be applied to individual contexts.
*
*
* Both Request uncompress and Response compress are gated by a configurable
* {@link DispatcherType} check on the GzipHandler.
* (This is similar in behavior to a {@link jakarta.servlet.Filter} configuration
* you would find in a Servlet Descriptor file ({@code WEB-INF/web.xml})
*
(Default: {@link DispatcherType#REQUEST}).
*
*
* Requests with a {@code Content-Encoding} header with the value {@code gzip} will
* be uncompressed by a {@link GzipHttpInputInterceptor} for any API that uses
* {@link HttpServletRequest#getInputStream()} or {@link HttpServletRequest#getReader()}.
*
*
* Response compression has a number of checks before GzipHandler will perform compression.
*
*
* -
* Does the request contain a {@code Accept-Encoding} header that specifies
* {@code gzip} value?
*
* -
* Is the {@link HttpServletRequest#getMethod()} allowed by the configured HTTP Method Filter.
*
(Default: {@code GET})
*
* -
* Is the incoming Path allowed by the configured Path Specs filters?
*
(Default: all paths are allowed)
*
* -
* Is the Request User-Agent allowed by the configured User-Agent filters?
*
(Default: MSIE 6 is excluded)
*
* -
* Is the Response {@code Content-Length} header present, and does its
* value meet the minimum gzip size requirements (default 32 bytes)?
*
* -
* Is the Request {@code Accept} header present and does it contain the
* required {@code gzip} value?
*
*
*
* When you encounter a configurable filter in the GzipHandler (method, paths, user-agent,
* mime-types, etc) that has both Included and Excluded values, note that the Included
* values always win over the Excluded values.
*
*
* Important note about Default Values:
* It is important to note that the GzipHandler will automatically configure itself from the
* MimeType present on the Server, System, and Contexts and the ultimate set of default values
* for the various filters (paths, methods, mime-types, etc) can be influenced by the
* available mime types to work with.
*
*
* ETag (or Entity Tag) information: any Request headers for {@code If-None-Match} or
* {@code If-Match} will be evaluated by the GzipHandler to determine if it was involved
* in compression of the response earlier. This is usually present as a {@code --gzip} suffix
* on the ETag that the Client User-Agent is tracking and handed to the Jetty server.
* The special {@code --gzip} suffix on the ETag is how GzipHandler knows that the content
* passed through itself, and this suffix will be stripped from the Request header values
* before the request is sent onwards to the specific webapp / servlet endpoint for
* handling.
* If a ETag is present in the Response headers, and GzipHandler is compressing the
* contents, it will add the {@code --gzip} suffix before the Response headers are committed
* and sent to the User Agent.
* Note that the suffix used is determined by {@link CompressedContentFormat#ETAG_SEPARATOR}
*
*
* This implementation relies on an Jetty internal {@link org.eclipse.jetty.server.HttpOutput.Interceptor}
* mechanism to allow for effective and efficient compression of the response on all Output API usages:
*
*
* -
* {@link jakarta.servlet.ServletOutputStream} - Obtained from {@link HttpServletResponse#getOutputStream()}
* using the traditional Blocking I/O techniques
*
* -
* {@link jakarta.servlet.WriteListener} - Provided to
* {@link jakarta.servlet.ServletOutputStream#setWriteListener(jakarta.servlet.WriteListener)}
* using the new (since Servlet 3.1) Async I/O techniques
*
* -
* {@link java.io.PrintWriter} - Obtained from {@link HttpServletResponse#getWriter()}
* using Blocking I/O techniques
*
*
*
* Historically the compression of responses were accomplished via
* Servlet Filters (eg: {@code GzipFilter}) and usage of {@link jakarta.servlet.http.HttpServletResponseWrapper}.
* Since the introduction of Async I/O in Servlet 3.1, this older form of Gzip support
* in web applications has been problematic and bug ridden.
*
*/
public class GzipHandler extends HandlerWrapper implements GzipFactory
{
public static final EnumSet ETAG_HEADERS = EnumSet.of(HttpHeader.IF_MATCH, HttpHeader.IF_NONE_MATCH);
public static final String GZIP_HANDLER_ETAGS = "o.e.j.s.h.gzip.GzipHandler.etag";
public static final String GZIP = "gzip";
public static final String DEFLATE = "deflate";
public static final int DEFAULT_MIN_GZIP_SIZE = 32;
public static final int BREAK_EVEN_GZIP_SIZE = 23;
private static final Logger LOG = LoggerFactory.getLogger(GzipHandler.class);
private static final HttpField X_CE_GZIP = new PreEncodedHttpField("X-Content-Encoding", "gzip");
private static final Pattern COMMA_GZIP = Pattern.compile(".*, *gzip");
private InflaterPool _inflaterPool;
private DeflaterPool _deflaterPool;
private int _minGzipSize = DEFAULT_MIN_GZIP_SIZE;
private boolean _syncFlush = false;
private int _inflateBufferSize = -1;
private EnumSet _dispatchers = EnumSet.of(DispatcherType.REQUEST);
// non-static, as other GzipHandler instances may have different configurations
private final IncludeExclude _methods = new IncludeExclude<>();
private final IncludeExclude _paths = new IncludeExclude<>(PathSpecSet.class);
private final IncludeExclude _inflatePaths = new IncludeExclude<>(PathSpecSet.class);
private final IncludeExclude _mimeTypes = new IncludeExclude<>(AsciiLowerCaseSet.class);
private HttpField _vary = GzipHttpOutputInterceptor.VARY_ACCEPT_ENCODING;
/**
* Instantiates a new GzipHandler.
*/
public GzipHandler()
{
_methods.include(HttpMethod.GET.asString());
_methods.include(HttpMethod.POST.asString());
for (String type : MimeTypes.getKnownMimeTypes())
{
if ("image/svg+xml".equals(type))
_paths.exclude("*.svgz");
else if (type.startsWith("image/") ||
type.startsWith("audio/") ||
type.startsWith("video/"))
_mimeTypes.exclude(type);
}
_mimeTypes.exclude("application/compress");
_mimeTypes.exclude("application/zip");
_mimeTypes.exclude("application/gzip");
_mimeTypes.exclude("application/bzip2");
_mimeTypes.exclude("application/brotli");
_mimeTypes.exclude("application/x-xz");
_mimeTypes.exclude("application/x-rar-compressed");
// It is possible to use SSE with GzipHandler but you will need to set _synFlush to true which will impact performance.
_mimeTypes.exclude("text/event-stream");
if (LOG.isDebugEnabled())
LOG.debug("{} mime types {}", this, _mimeTypes);
}
@Override
protected void doStart() throws Exception
{
Server server = getServer();
if (_inflaterPool == null)
{
_inflaterPool = InflaterPool.ensurePool(server);
addBean(_inflaterPool);
}
if (_deflaterPool == null)
{
_deflaterPool = DeflaterPool.ensurePool(server);
addBean(_deflaterPool);
}
super.doStart();
}
@Override
protected void doStop() throws Exception
{
super.doStop();
removeBean(_inflaterPool);
_inflaterPool = null;
removeBean(_deflaterPool);
_deflaterPool = null;
}
/**
* @return The VARY field to use.
*/
public HttpField getVary()
{
return _vary;
}
/**
* @param vary The VARY field to use. It if is not an instance of {@link PreEncodedHttpField},
* then it will be converted to one.
*/
public void setVary(HttpField vary)
{
if (isRunning())
throw new IllegalStateException(getState());
if (vary == null || (vary instanceof PreEncodedHttpField))
_vary = vary;
else
_vary = new PreEncodedHttpField(vary.getHeader(), vary.getName(), vary.getValue());
}
/**
* Add excluded to the HTTP methods filtering.
*
* @param methods The methods to exclude in compression
* @see #addIncludedMethods(String...)
*/
public void addExcludedMethods(String... methods)
{
for (String m : methods)
{
_methods.exclude(m);
}
}
/**
* Get the Set of {@link DispatcherType} that this Filter will operate on.
*
* @return the set of {@link DispatcherType} this filter will operate on
*/
public EnumSet getDispatcherTypes()
{
return _dispatchers;
}
/**
* Set of supported {@link DispatcherType} that this filter will operate on.
*
* @param dispatchers the set of {@link DispatcherType} that this filter will operate on
*/
public void setDispatcherTypes(EnumSet dispatchers)
{
_dispatchers = dispatchers;
}
/**
* Set the list of supported {@link DispatcherType} that this filter will operate on.
*
* @param dispatchers the list of {@link DispatcherType} that this filter will operate on
*/
public void setDispatcherTypes(DispatcherType... dispatchers)
{
_dispatchers = EnumSet.copyOf(Arrays.asList(dispatchers));
}
/**
* Adds excluded MIME types for response filtering.
*
*
* Deprecation Warning:
* For backward compatibility the MIME types parameters may be comma separated strings,
* but this will not be supported in future versions of Jetty.
*
*
* @param types The mime types to exclude (without charset or other parameters).
* @see #addIncludedMimeTypes(String...)
*/
public void addExcludedMimeTypes(String... types)
{
for (String t : types)
{
_mimeTypes.exclude(StringUtil.csvSplit(t));
}
}
/**
* Adds excluded Path Specs for request filtering.
*
*
* There are 2 syntaxes supported, Servlet url-pattern based, and
* Regex based. This means that the initial characters on the path spec
* line are very strict, and determine the behavior of the path matching.
*
* - If the spec starts with
'^' the spec is assumed to be
* a regex based path spec and will match with normal Java regex rules.
* - If the spec starts with
'/' then spec is assumed to be
* a Servlet url-pattern rules path spec for either an exact match
* or prefix based match.
* - If the spec starts with
'*.' then spec is assumed to be
* a Servlet url-pattern rules path spec for a suffix based match.
* - All other syntaxes are unsupported
*
*
* Note: inclusion takes precedence over exclude.
*
* @param pathspecs Path specs (as per servlet spec) to exclude. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute.
* For backward compatibility the pathspecs may be comma separated strings, but this
* will not be supported in future versions.
* @see #addIncludedPaths(String...)
*/
public void addExcludedPaths(String... pathspecs)
{
for (String p : pathspecs)
{
_paths.exclude(StringUtil.csvSplit(p));
}
}
/**
* Adds excluded Path Specs for request filtering on request inflation.
*
*
* There are 2 syntaxes supported, Servlet url-pattern based, and
* Regex based. This means that the initial characters on the path spec
* line are very strict, and determine the behavior of the path matching.
*
* - If the spec starts with
'^' the spec is assumed to be
* a regex based path spec and will match with normal Java regex rules.
* - If the spec starts with
'/' then spec is assumed to be
* a Servlet url-pattern rules path spec for either an exact match
* or prefix based match.
* - If the spec starts with
'*.' then spec is assumed to be
* a Servlet url-pattern rules path spec for a suffix based match.
* - All other syntaxes are unsupported
*
*
* Note: inclusion takes precedence over exclude.
*
* @param pathspecs Path specs (as per servlet spec) to exclude. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute.
* For backward compatibility the pathspecs may be comma separated strings, but this
* will not be supported in future versions.
* @see #addIncludedInflationPaths(String...)
*/
public void addExcludedInflationPaths(String... pathspecs)
{
for (String p : pathspecs)
{
_inflatePaths.exclude(StringUtil.csvSplit(p));
}
}
/**
* Adds included HTTP Methods (eg: POST, PATCH, DELETE) for filtering.
*
* @param methods The HTTP methods to include in compression.
* @see #addExcludedMethods(String...)
*/
public void addIncludedMethods(String... methods)
{
for (String m : methods)
{
_methods.include(m);
}
}
/**
* Is the {@link Deflater} running {@link Deflater#SYNC_FLUSH} or not.
*
* @return True if {@link Deflater#SYNC_FLUSH} is used, else {@link Deflater#NO_FLUSH}
* @see #setSyncFlush(boolean)
*/
public boolean isSyncFlush()
{
return _syncFlush;
}
/**
* Set the {@link Deflater} flush mode to use. {@link Deflater#SYNC_FLUSH}
* should be used if the application wishes to stream the data, but this may
* hurt compression performance.
*
* @param syncFlush True if {@link Deflater#SYNC_FLUSH} is used, else {@link Deflater#NO_FLUSH}
* @see #isSyncFlush()
*/
public void setSyncFlush(boolean syncFlush)
{
_syncFlush = syncFlush;
}
/**
* Add included MIME types for response filtering
*
* @param types The mime types to include (without charset or other parameters)
* For backward compatibility the mimetypes may be comma separated strings, but this
* will not be supported in future versions.
* @see #addExcludedMimeTypes(String...)
*/
public void addIncludedMimeTypes(String... types)
{
for (String t : types)
{
_mimeTypes.include(StringUtil.csvSplit(t));
}
}
/**
* Add included Path Specs for filtering.
*
*
* There are 2 syntaxes supported, Servlet url-pattern based, and
* Regex based. This means that the initial characters on the path spec
* line are very strict, and determine the behavior of the path matching.
*
* - If the spec starts with
'^' the spec is assumed to be
* a regex based path spec and will match with normal Java regex rules.
* - If the spec starts with
'/' then spec is assumed to be
* a Servlet url-pattern rules path spec for either an exact match
* or prefix based match.
* - If the spec starts with
'*.' then spec is assumed to be
* a Servlet url-pattern rules path spec for a suffix based match.
* - All other syntaxes are unsupported
*
*
* Note: inclusion takes precedence over exclusion.
*
* @param pathspecs Path specs (as per servlet spec) to include. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute
*/
public void addIncludedPaths(String... pathspecs)
{
for (String p : pathspecs)
{
_paths.include(StringUtil.csvSplit(p));
}
}
/**
* Add included Path Specs for filtering on request inflation.
*
*
* There are 2 syntaxes supported, Servlet url-pattern based, and
* Regex based. This means that the initial characters on the path spec
* line are very strict, and determine the behavior of the path matching.
*
* - If the spec starts with
'^' the spec is assumed to be
* a regex based path spec and will match with normal Java regex rules.
* - If the spec starts with
'/' then spec is assumed to be
* a Servlet url-pattern rules path spec for either an exact match
* or prefix based match.
* - If the spec starts with
'*.' then spec is assumed to be
* a Servlet url-pattern rules path spec for a suffix based match.
* - All other syntaxes are unsupported
*
*
* Note: inclusion takes precedence over exclusion.
*
* @param pathspecs Path specs (as per servlet spec) to include. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute
*/
public void addIncludedInflationPaths(String... pathspecs)
{
for (String p : pathspecs)
{
_inflatePaths.include(StringUtil.csvSplit(p));
}
}
@Override
public DeflaterPool.Entry getDeflaterEntry(Request request, long contentLength)
{
if (contentLength >= 0 && contentLength < _minGzipSize)
{
LOG.debug("{} excluded minGzipSize {}", this, request);
return null;
}
// check the accept encoding header
if (!request.getHttpFields().contains(HttpHeader.ACCEPT_ENCODING, "gzip"))
{
LOG.debug("{} excluded not gzip accept {}", this, request);
return null;
}
return _deflaterPool.acquire();
}
/**
* Get the current filter list of excluded HTTP methods
*
* @return the filter list of excluded HTTP methods
* @see #getIncludedMethods()
*/
public String[] getExcludedMethods()
{
Set excluded = _methods.getExcluded();
return excluded.toArray(new String[0]);
}
/**
* Get the current filter list of excluded MIME types
*
* @return the filter list of excluded MIME types
* @see #getIncludedMimeTypes()
*/
public String[] getExcludedMimeTypes()
{
Set excluded = _mimeTypes.getExcluded();
return excluded.toArray(new String[0]);
}
/**
* Get the current filter list of excluded Path Specs
*
* @return the filter list of excluded Path Specs
* @see #getIncludedPaths()
*/
public String[] getExcludedPaths()
{
Set excluded = _paths.getExcluded();
return excluded.toArray(new String[0]);
}
/**
* Get the current filter list of excluded Path Specs for request inflation.
*
* @return the filter list of excluded Path Specs
* @see #getIncludedInflationPaths()
*/
public String[] getExcludedInflationPaths()
{
Set excluded = _inflatePaths.getExcluded();
return excluded.toArray(new String[0]);
}
/**
* Get the current filter list of included HTTP Methods
*
* @return the filter list of included HTTP methods
* @see #getExcludedMethods()
*/
public String[] getIncludedMethods()
{
Set includes = _methods.getIncluded();
return includes.toArray(new String[0]);
}
/**
* Get the current filter list of included MIME types
*
* @return the filter list of included MIME types
* @see #getExcludedMimeTypes()
*/
public String[] getIncludedMimeTypes()
{
Set includes = _mimeTypes.getIncluded();
return includes.toArray(new String[0]);
}
/**
* Get the current filter list of included Path Specs
*
* @return the filter list of included Path Specs
* @see #getExcludedPaths()
*/
public String[] getIncludedPaths()
{
Set includes = _paths.getIncluded();
return includes.toArray(new String[0]);
}
/**
* Get the current filter list of included Path Specs for request inflation.
*
* @return the filter list of included Path Specs
* @see #getExcludedInflationPaths()
*/
public String[] getIncludedInflationPaths()
{
Set includes = _inflatePaths.getIncluded();
return includes.toArray(new String[0]);
}
/**
* Get the minimum size, in bytes, that a response {@code Content-Length} must be
* before compression will trigger.
*
* @return minimum response size (in bytes) that triggers compression
* @see #setMinGzipSize(int)
*/
public int getMinGzipSize()
{
return _minGzipSize;
}
protected HttpField getVaryField()
{
return _vary;
}
/**
* Get the size (in bytes) of the {@link java.util.zip.Inflater} buffer used to inflate
* compressed requests.
*
* @return size in bytes of the buffer, or 0 for no inflation.
*/
public int getInflateBufferSize()
{
return _inflateBufferSize;
}
/**
* Set the size (in bytes) of the {@link java.util.zip.Inflater} buffer used to inflate comrpessed requests.
*
* @param size size in bytes of the buffer, or 0 for no inflation.
*/
public void setInflateBufferSize(int size)
{
_inflateBufferSize = size;
}
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
if (baseRequest.isHandled())
{
super.handle(target, baseRequest, request, response);
return;
}
final ServletContext context = baseRequest.getServletContext();
final String path = baseRequest.getPathInContext();
LOG.debug("{} handle {} in {}", this, baseRequest, context);
if (!_dispatchers.contains(baseRequest.getDispatcherType()))
{
LOG.debug("{} excluded by dispatcherType {}", this, baseRequest.getDispatcherType());
super.handle(target, baseRequest, request, response);
return;
}
// Handle request inflation
HttpFields httpFields = baseRequest.getHttpFields();
boolean inflated = _inflateBufferSize > 0 && httpFields.contains(HttpHeader.CONTENT_ENCODING, "gzip") && isPathInflatable(path);
if (inflated)
{
if (LOG.isDebugEnabled())
LOG.debug("{} inflate {}", this, request);
GzipHttpInputInterceptor gzipHttpInputInterceptor =
new GzipHttpInputInterceptor(_inflaterPool, baseRequest.getHttpChannel().getByteBufferPool(),
_inflateBufferSize, baseRequest.getHttpChannel().isUseInputDirectByteBuffers());
baseRequest.getHttpInput().addInterceptor(gzipHttpInputInterceptor);
}
// From here on out, the response output gzip determination is made
// Don't attempt to modify the response output if it's already committed.
if (response.isCommitted())
{
super.handle(target, baseRequest, request, response);
return;
}
// Are we already being gzipped?
HttpOutput out = baseRequest.getResponse().getHttpOutput();
HttpOutput.Interceptor interceptor = out.getInterceptor();
boolean alreadyGzipped = false;
while (interceptor != null)
{
if (interceptor instanceof GzipHttpOutputInterceptor)
{
alreadyGzipped = true;
break;
}
interceptor = interceptor.getNextInterceptor();
}
// Update headers for etags and inflation
if (inflated || httpFields.contains(ETAG_HEADERS))
{
HttpFields.Mutable newFields = HttpFields.build(httpFields.size() + 1);
for (HttpField field : httpFields)
{
if (field.getHeader() == null)
{
newFields.add(field);
continue;
}
switch (field.getHeader())
{
case IF_MATCH:
case IF_NONE_MATCH:
{
String etags = field.getValue();
String etagsNoSuffix = CompressedContentFormat.GZIP.stripSuffixes(etags);
if (etagsNoSuffix.equals(etags))
newFields.add(field);
else
{
newFields.add(new HttpField(field.getHeader(), etagsNoSuffix));
baseRequest.setAttribute(GZIP_HANDLER_ETAGS, etags);
}
break;
}
case CONTENT_LENGTH:
newFields.add(inflated ? new HttpField("X-Content-Length", field.getValue()) : field);
break;
case CONTENT_ENCODING:
if (inflated)
{
if (field.getValue().equalsIgnoreCase("gzip"))
newFields.add(X_CE_GZIP);
else if (COMMA_GZIP.matcher(field.getValue()).matches())
{
String v = field.getValue();
v = v.substring(0, v.lastIndexOf(','));
newFields.add(X_CE_GZIP);
newFields.add(new HttpField(HttpHeader.CONTENT_ENCODING, v));
}
}
else
{
newFields.add(field);
}
break;
default:
newFields.add(field);
}
}
baseRequest.setHttpFields(newFields);
}
// Don't gzip if already gzipped;
if (alreadyGzipped)
{
LOG.debug("{} already intercepting {}", this, request);
super.handle(target, baseRequest, request, response);
return;
}
// If not a supported method - no Vary because no matter what client, this URI is always excluded
if (!_methods.test(baseRequest.getMethod()))
{
LOG.debug("{} excluded by method {}", this, request);
super.handle(target, baseRequest, request, response);
return;
}
// If not a supported URI- no Vary because no matter what client, this URI is always excluded
// Use pathInfo because this is be
if (!isPathGzipable(path))
{
LOG.debug("{} excluded by path {}", this, request);
super.handle(target, baseRequest, request, response);
return;
}
// Exclude non compressible mime-types known from URI extension. - no Vary because no matter what client, this URI is always excluded
String mimeType = context == null ? MimeTypes.getDefaultMimeByExtension(path) : context.getMimeType(path);
if (mimeType != null)
{
mimeType = HttpField.valueParameters(mimeType, null);
if (!isMimeTypeGzipable(mimeType))
{
LOG.debug("{} excluded by path suffix mime type {}", this, request);
// handle normally without setting vary header
super.handle(target, baseRequest, request, response);
return;
}
}
HttpOutput.Interceptor origInterceptor = out.getInterceptor();
try
{
// install interceptor and handle
out.setInterceptor(new GzipHttpOutputInterceptor(this, getVaryField(), baseRequest.getHttpChannel(), origInterceptor, isSyncFlush()));
super.handle(target, baseRequest, request, response);
}
finally
{
// reset interceptor if request not handled
if (!baseRequest.isHandled() && !baseRequest.isAsyncStarted())
out.setInterceptor(origInterceptor);
}
}
/**
* Test if the provided MIME type is allowed based on the MIME type filters.
*
* @param mimetype the MIME type to test
* @return true if allowed, false otherwise
*/
@Override
public boolean isMimeTypeGzipable(String mimetype)
{
return _mimeTypes.test(mimetype);
}
/**
* Test if the provided Request URI is allowed based on the Path Specs filters.
*
* @param requestURI the request uri
* @return whether compressing is allowed for the given the path
*/
protected boolean isPathGzipable(String requestURI)
{
if (requestURI == null)
return true;
return _paths.test(requestURI);
}
/**
* Test if the provided Request URI is allowed to be inflated based on the Path Specs filters.
*
* @param requestURI the request uri
* @return whether decompressing is allowed for the given the path.
*/
protected boolean isPathInflatable(String requestURI)
{
if (requestURI == null)
return true;
return _inflatePaths.test(requestURI);
}
/**
* Set the excluded filter list of HTTP methods (replacing any previously set)
*
* @param methods the HTTP methods to exclude
* @see #setIncludedMethods(String...)
*/
public void setExcludedMethods(String... methods)
{
_methods.getExcluded().clear();
_methods.exclude(methods);
}
/**
* Set the excluded filter list of MIME types (replacing any previously set)
*
* @param types The mime types to exclude (without charset or other parameters)
* @see #setIncludedMimeTypes(String...)
*/
public void setExcludedMimeTypes(String... types)
{
_mimeTypes.getExcluded().clear();
_mimeTypes.exclude(types);
}
/**
* Set the excluded filter list of MIME types (replacing any previously set)
*
* @param csvTypes The list of mime types to exclude (without charset or other parameters), CSV format
* @see #setIncludedMimeTypesList(String)
*/
public void setExcludedMimeTypesList(String csvTypes)
{
setExcludedMimeTypes(StringUtil.csvSplit(csvTypes));
}
/**
* Set the excluded filter list of Path specs (replacing any previously set)
*
* @param pathspecs Path specs (as per servlet spec) to exclude. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute.
* @see #setIncludedPaths(String...)
*/
public void setExcludedPaths(String... pathspecs)
{
_paths.getExcluded().clear();
_paths.exclude(pathspecs);
}
/**
* Set the excluded filter list of Path specs (replacing any previously set)
*
* @param pathspecs Path specs (as per servlet spec) to exclude from inflation. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute.
* @see #setIncludedInflatePaths(String...)
*/
public void setExcludedInflatePaths(String... pathspecs)
{
_inflatePaths.getExcluded().clear();
_inflatePaths.exclude(pathspecs);
}
/**
* Set of supported {@link DispatcherType} that this filter will operate on.
*
* @param dispatchers the set of {@link DispatcherType} that this filter will operate on
*/
public void setDispatcherTypes(String... dispatchers)
{
_dispatchers = EnumSet.copyOf(Stream.of(dispatchers)
.flatMap(s -> Stream.of(StringUtil.csvSplit(s)))
.map(DispatcherType::valueOf)
.collect(Collectors.toSet()));
}
/**
* Set the included filter list of HTTP methods (replacing any previously set)
*
* @param methods The methods to include in compression
* @see #setExcludedMethods(String...)
*/
public void setIncludedMethods(String... methods)
{
_methods.getIncluded().clear();
_methods.include(methods);
}
/**
* Set the included filter list of MIME types (replacing any previously set)
*
* @param types The mime types to include (without charset or other parameters)
* @see #setExcludedMimeTypes(String...)
*/
public void setIncludedMimeTypes(String... types)
{
_mimeTypes.getIncluded().clear();
_mimeTypes.include(types);
}
/**
* Set the included filter list of MIME types (replacing any previously set)
*
* @param csvTypes The list of mime types to include (without charset or other parameters), CSV format
* @see #setExcludedMimeTypesList(String)
*/
public void setIncludedMimeTypesList(String csvTypes)
{
setIncludedMimeTypes(StringUtil.csvSplit(csvTypes));
}
/**
* Set the included filter list of Path specs (replacing any previously set)
*
* @param pathspecs Path specs (as per servlet spec) to include. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute
* @see #setExcludedPaths(String...)
*/
public void setIncludedPaths(String... pathspecs)
{
_paths.getIncluded().clear();
_paths.include(pathspecs);
}
/**
* Set the included filter list of Path specs (replacing any previously set)
*
* @param pathspecs Path specs (as per servlet spec) to include for inflation. If a
* ServletContext is available, the paths are relative to the context path,
* otherwise they are absolute
* @see #setExcludedInflatePaths(String...)
*/
public void setIncludedInflatePaths(String... pathspecs)
{
_inflatePaths.getIncluded().clear();
_inflatePaths.include(pathspecs);
}
/**
* Set the minimum response size to trigger dynamic compression.
*
* Sizes below {@link #BREAK_EVEN_GZIP_SIZE} will result a compressed response that is larger than the
* original data.
*
*
* @param minGzipSize minimum response size in bytes (not allowed to be lower then {@link #BREAK_EVEN_GZIP_SIZE})
*/
public void setMinGzipSize(int minGzipSize)
{
if (minGzipSize < BREAK_EVEN_GZIP_SIZE)
LOG.warn("minGzipSize of {} is inefficient for short content, break even is size {}", minGzipSize, BREAK_EVEN_GZIP_SIZE);
_minGzipSize = Math.max(0, minGzipSize);
}
/**
* Set the included filter list of HTTP Methods (replacing any previously set)
*
* @param csvMethods the list of methods, CSV format
* @see #setExcludedMethodList(String)
*/
public void setIncludedMethodList(String csvMethods)
{
setIncludedMethods(StringUtil.csvSplit(csvMethods));
}
/**
* Get the included filter list of HTTP methods in CSV format
*
* @return the included filter list of HTTP methods in CSV format
* @see #getExcludedMethodList()
*/
public String getIncludedMethodList()
{
return String.join(",", getIncludedMethods());
}
/**
* Set the excluded filter list of HTTP Methods (replacing any previously set)
*
* @param csvMethods the list of methods, CSV format
* @see #setIncludedMethodList(String)
*/
public void setExcludedMethodList(String csvMethods)
{
setExcludedMethods(StringUtil.csvSplit(csvMethods));
}
/**
* Get the excluded filter list of HTTP methods in CSV format
*
* @return the excluded filter list of HTTP methods in CSV format
* @see #getIncludedMethodList()
*/
public String getExcludedMethodList()
{
return String.join(",", getExcludedMethods());
}
/**
* Get the DeflaterPool being used. The default value of this is null before starting, but after starting if it is null
* it will be set to the default DeflaterPool which is stored as a bean on the server.
* @return the DeflaterPool being used.
*/
public DeflaterPool getDeflaterPool()
{
return _deflaterPool;
}
/**
* Get the InflaterPool being used. The default value of this is null before starting, but after starting if it is null
* it will be set to the default InflaterPool which is stored as a bean on the server.
* @return the DeflaterPool being used.
*/
public InflaterPool getInflaterPool()
{
return _inflaterPool;
}
/**
* Set the DeflaterPool to be used. This should be called before starting.
* If this value is null when starting the default pool will be used from the server.
* @param deflaterPool the DeflaterPool to use.
*/
public void setDeflaterPool(DeflaterPool deflaterPool)
{
if (isStarted())
throw new IllegalStateException(getState());
updateBean(_deflaterPool, deflaterPool);
_deflaterPool = deflaterPool;
}
/**
* Set the InflaterPool to be used. This should be called before starting.
* If this value is null when starting the default pool will be used from the server.
* @param inflaterPool the InflaterPool to use.
*/
public void setInflaterPool(InflaterPool inflaterPool)
{
if (isStarted())
throw new IllegalStateException(getState());
updateBean(_inflaterPool, inflaterPool);
_inflaterPool = inflaterPool;
}
/**
* Gets the maximum number of Deflaters that the DeflaterPool can hold.
*
* @return the Deflater pool capacity
* @deprecated for custom DeflaterPool settings use {@link #setDeflaterPool(DeflaterPool)}.
*/
@Deprecated
public int getDeflaterPoolCapacity()
{
return (_deflaterPool == null) ? CompressionPool.DEFAULT_CAPACITY : _deflaterPool.getCapacity();
}
/**
* Sets the maximum number of Deflaters that the DeflaterPool can hold.
* @deprecated for custom DeflaterPool settings use {@link #setDeflaterPool(DeflaterPool)}.
*/
@Deprecated
public void setDeflaterPoolCapacity(int capacity)
{
if (_deflaterPool != null)
_deflaterPool.setCapacity(capacity);
}
/**
* Gets the maximum number of Inflaters that the InflaterPool can hold.
*
* @return the Inflater pool capacity
* @deprecated for custom InflaterPool settings use {@link #setInflaterPool(InflaterPool)}.
*/
@Deprecated
public int getInflaterPoolCapacity()
{
return (_inflaterPool == null) ? CompressionPool.DEFAULT_CAPACITY : _inflaterPool.getCapacity();
}
/**
* Sets the maximum number of Inflaters that the InflaterPool can hold.
* @deprecated for custom InflaterPool settings use {@link #setInflaterPool(InflaterPool)}.
*/
@Deprecated
public void setInflaterPoolCapacity(int capacity)
{
if (_inflaterPool != null)
_inflaterPool.setCapacity(capacity);
}
@Override
public String toString()
{
return String.format("%s@%x{%s,min=%s,inflate=%s}", getClass().getSimpleName(), hashCode(), getState(), _minGzipSize, _inflateBufferSize);
}
}