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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995 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;
import java.time.Duration;
import java.util.List;
import org.eclipse.jetty.http.CompressedContentFormat;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.http.HttpURI;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.http.content.FileMappingHttpContentFactory;
import org.eclipse.jetty.http.content.HttpContent;
import org.eclipse.jetty.http.content.PreCompressedHttpContentFactory;
import org.eclipse.jetty.http.content.ResourceHttpContentFactory;
import org.eclipse.jetty.http.content.ValidatingCachingHttpContentFactory;
import org.eclipse.jetty.http.content.VirtualHttpContentFactory;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.server.Context;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.ResourceService;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.util.resource.ResourceFactory;
import org.eclipse.jetty.util.resource.Resources;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Resource Handler will serve static content and handle If-Modified-Since headers. No caching is done.
* Requests for resources that do not exist are let pass (Eg no 404's).
*/
public class ResourceHandler extends Handler.Wrapper
{
// TODO there is a lot of URI manipulation, this should be factored out in a utility class.
// TODO Missing:
// - current context' mime types
// - Default stylesheet (needs Resource impl for classpath resources)
// - request ranges
// - a way to configure caching or not
private static final Logger LOG = LoggerFactory.getLogger(ResourceHandler.class);
private final ResourceService _resourceService = newResourceService();
private ByteBufferPool _byteBufferPool;
private Resource _baseResource;
private Resource _styleSheet;
private MimeTypes _mimeTypes;
private List _welcomes = List.of("index.html");
private boolean _useFileMapping = true;
public ResourceHandler()
{
this(null);
}
public ResourceHandler(Handler handler)
{
super(handler);
}
protected ResourceService newResourceService()
{
return new HandlerResourceService();
}
public ResourceService getResourceService()
{
return _resourceService;
}
@Override
public void doStart() throws Exception
{
Context context = ContextHandler.getCurrentContext(getServer());
if (_baseResource == null)
{
if (context != null)
_baseResource = context.getBaseResource();
}
else if (_baseResource.isAlias())
{
LOG.warn("Base Resource should not be an alias");
}
setMimeTypes(context == null ? MimeTypes.DEFAULTS : context.getMimeTypes());
_byteBufferPool = getByteBufferPool(context);
ResourceService resourceService = getResourceService();
resourceService.setHttpContentFactory(newHttpContentFactory());
resourceService.setWelcomeFactory(setupWelcomeFactory());
if (getStyleSheet() == null)
setStyleSheet(getServer().getDefaultStyleSheet());
super.doStart();
}
private ByteBufferPool getByteBufferPool(Context context)
{
if (context == null)
return ByteBufferPool.NON_POOLING;
Server server = getServer();
if (server == null)
return ByteBufferPool.NON_POOLING;
return server.getByteBufferPool();
}
public HttpContent.Factory getHttpContentFactory()
{
return _resourceService.getHttpContentFactory();
}
protected HttpContent.Factory newHttpContentFactory()
{
HttpContent.Factory contentFactory = new ResourceHttpContentFactory(getBaseResource(), getMimeTypes());
if (isUseFileMapping())
contentFactory = new FileMappingHttpContentFactory(contentFactory);
contentFactory = new VirtualHttpContentFactory(contentFactory, getStyleSheet(), "text/css");
contentFactory = new PreCompressedHttpContentFactory(contentFactory, getPrecompressedFormats());
contentFactory = new ValidatingCachingHttpContentFactory(contentFactory, Duration.ofSeconds(1).toMillis(), getByteBufferPool());
return contentFactory;
}
protected ResourceService.WelcomeFactory setupWelcomeFactory()
{
return (content, request) ->
{
if (_welcomes == null)
return null;
for (String welcome : _welcomes)
{
String pathInContext = Request.getPathInContext(request);
String welcomeInContext = URIUtil.addPaths(pathInContext, welcome);
Resource welcomePath = content.getResource().resolve(welcome);
if (Resources.isReadableFile(welcomePath))
return welcomeInContext;
}
// not found
return null;
};
}
@Override
public boolean handle(Request request, Response response, Callback callback) throws Exception
{
if (!HttpMethod.GET.is(request.getMethod()) && !HttpMethod.HEAD.is(request.getMethod()))
{
// try another handler
return super.handle(request, response, callback);
}
HttpContent content = _resourceService.getContent(Request.getPathInContext(request), request);
if (content == null)
{
return super.handle(request, response, callback); // no content - try other handlers
}
_resourceService.doGet(request, response, callback, content);
return true;
}
/**
* @return Returns the resourceBase.
*/
public Resource getBaseResource()
{
return _baseResource;
}
public ByteBufferPool getByteBufferPool()
{
return _byteBufferPool;
}
/**
* Get the cacheControl header to set on all static content..
* @return the cacheControl header to set on all static content.
*/
public String getCacheControl()
{
return _resourceService.getCacheControl();
}
/**
* @return file extensions that signify that a file is gzip compressed. Eg ".svgz"
*/
public List getGzipEquivalentFileExtensions()
{
return _resourceService.getGzipEquivalentFileExtensions();
}
public MimeTypes getMimeTypes()
{
return _mimeTypes;
}
/**
* @return Returns the stylesheet as a Resource.
*/
public Resource getStyleSheet()
{
return (_styleSheet == null) ? getServer().getDefaultStyleSheet() : _styleSheet;
}
public List getWelcomeFiles()
{
return _welcomes;
}
/**
* @return If true, range requests and responses are supported
*/
public boolean isAcceptRanges()
{
return _resourceService.isAcceptRanges();
}
/**
* @return If true, directory listings are returned if no welcome file is found. Else 403 Forbidden.
*/
public boolean isDirAllowed()
{
return _resourceService.isDirAllowed();
}
/**
* @return True if ETag processing is done
*/
public boolean isEtags()
{
return _resourceService.isEtags();
}
public boolean isUseFileMapping()
{
return _useFileMapping;
}
/**
* @return Precompressed resources formats that can be used to serve compressed variant of resources.
*/
public List getPrecompressedFormats()
{
return _resourceService.getPrecompressedFormats();
}
public ResourceService.WelcomeMode getWelcomeMode()
{
return _resourceService.getWelcomeMode();
}
/**
* @param acceptRanges If true, range requests and responses are supported
*/
public void setAcceptRanges(boolean acceptRanges)
{
_resourceService.setAcceptRanges(acceptRanges);
}
/**
* @param base The resourceBase to server content from. If null the
* context resource base is used.
*/
public void setBaseResource(Resource base)
{
if (isStarted())
throw new IllegalStateException(getState());
_baseResource = base;
}
/**
* @param base The resourceBase to server content from. If null the
* context resource base is used. If non-null the {@link Resource} is created
* from {@link ResourceFactory#of(org.eclipse.jetty.util.component.Container)} for
* this context.
*/
public void setBaseResourceAsString(String base)
{
setBaseResource(base == null ? null : ResourceFactory.of(this).newResource(base));
}
/**
* Set the cacheControl header to set on all static content..
* @param cacheControl the cacheControl header to set on all static content.
*/
public void setCacheControl(String cacheControl)
{
_resourceService.setCacheControl(cacheControl);
}
/**
* @param dirAllowed If true, directory listings are returned if no welcome file is found. Else 403 Forbidden.
*/
public void setDirAllowed(boolean dirAllowed)
{
_resourceService.setDirAllowed(dirAllowed);
}
/**
* @param etags True if ETag processing is done
*/
public void setEtags(boolean etags)
{
_resourceService.setEtags(etags);
}
/**
* Set file extensions that signify that a file is gzip compressed. Eg ".svgz".
* @param gzipEquivalentFileExtensions file extensions that signify that a file is gzip compressed. Eg ".svgz"
*/
public void setGzipEquivalentFileExtensions(List gzipEquivalentFileExtensions)
{
_resourceService.setGzipEquivalentFileExtensions(gzipEquivalentFileExtensions);
}
/**
* @param precompressedFormats The list of precompresed formats to serve in encoded format if matching resource found.
* For example serve gzip encoded file if ".gz" suffixed resource is found.
*/
public void setPrecompressedFormats(CompressedContentFormat... precompressedFormats)
{
setPrecompressedFormats(List.of(precompressedFormats));
}
/**
* @param precompressedFormats The list of precompresed formats to serve in encoded format if matching resource found.
* For example serve gzip encoded file if ".gz" suffixed resource is found.
*/
public void setPrecompressedFormats(List precompressedFormats)
{
_resourceService.setPrecompressedFormats(precompressedFormats);
}
public void setEncodingCacheSize(int encodingCacheSize)
{
_resourceService.setEncodingCacheSize(encodingCacheSize);
}
public int getEncodingCacheSize()
{
return _resourceService.getEncodingCacheSize();
}
public void setMimeTypes(MimeTypes mimeTypes)
{
_mimeTypes = mimeTypes;
}
public void setUseFileMapping(boolean useFileMapping)
{
if (isRunning())
throw new IllegalStateException("Unable to set useFileMapping on started " + this);
_useFileMapping = useFileMapping;
}
public void setWelcomeMode(ResourceService.WelcomeMode welcomeMode)
{
_resourceService.setWelcomeMode(welcomeMode);
}
/**
* @param styleSheet The location of the style sheet to be used as a String.
*/
public void setStyleSheet(Resource styleSheet)
{
_styleSheet = styleSheet;
}
public void setWelcomeFiles(String... welcomeFiles)
{
setWelcomeFiles(List.of(welcomeFiles));
}
public void setWelcomeFiles(List welcomeFiles)
{
_welcomes = welcomeFiles;
}
/**
* Utility class to create a ContextHandler containing a ResourceHandler.
*/
public static class ResourceContext extends ContextHandler
{
public ResourceContext()
{
setHandler(new ResourceHandler());
}
}
private class HandlerResourceService extends ResourceService
{
@Override
protected void rehandleWelcome(Request request, Response response, Callback callback, String welcomeTarget) throws Exception
{
HttpURI newHttpURI = HttpURI.build(request.getHttpURI()).pathQuery(welcomeTarget);
Request newRequest = Request.serveAs(request, newHttpURI);
if (getServer().handle(newRequest, response, callback))
return;
super.rehandleWelcome(request, response, callback, welcomeTarget);
}
}
}
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