org.eclipse.jetty.server.handler.ResourceHandler Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server.handler;
import java.io.IOException;
import java.io.OutputStream;
import java.net.MalformedURLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.HttpHeaders;
import org.eclipse.jetty.http.HttpMethods;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.ByteArrayBuffer;
import org.eclipse.jetty.io.WriterOutputStream;
import org.eclipse.jetty.server.AbstractHttpConnection;
import org.eclipse.jetty.server.Dispatcher;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.server.handler.ContextHandler.Context;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.FileResource;
import org.eclipse.jetty.util.resource.Resource;
/* ------------------------------------------------------------ */
/** Resource Handler.
*
* This handle 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).
*
*
* @org.apache.xbean.XBean
*/
public class ResourceHandler extends HandlerWrapper
{
private static final Logger LOG = Log.getLogger(ResourceHandler.class);
ContextHandler _context;
Resource _baseResource;
Resource _defaultStylesheet;
Resource _stylesheet;
String[] _welcomeFiles={"index.html"};
MimeTypes _mimeTypes = new MimeTypes();
ByteArrayBuffer _cacheControl;
boolean _aliases;
boolean _directory;
boolean _etags;
/* ------------------------------------------------------------ */
public ResourceHandler()
{
}
/* ------------------------------------------------------------ */
public MimeTypes getMimeTypes()
{
return _mimeTypes;
}
/* ------------------------------------------------------------ */
public void setMimeTypes(MimeTypes mimeTypes)
{
_mimeTypes = mimeTypes;
}
/* ------------------------------------------------------------ */
/**
* @return True if resource aliases are allowed.
*/
public boolean isAliases()
{
return _aliases;
}
/* ------------------------------------------------------------ */
/**
* Set if resource aliases (eg symlink, 8.3 names, case insensitivity) are allowed.
* Allowing aliases can significantly increase security vulnerabilities.
* If this handler is deployed inside a ContextHandler, then the
* {@link ContextHandler#isAliases()} takes precedent.
* @param aliases True if aliases are supported.
*/
public void setAliases(boolean aliases)
{
_aliases = aliases;
}
/* ------------------------------------------------------------ */
/** Get the directory option.
* @return true if directories are listed.
*/
public boolean isDirectoriesListed()
{
return _directory;
}
/* ------------------------------------------------------------ */
/** Set the directory.
* @param directory true if directories are listed.
*/
public void setDirectoriesListed(boolean directory)
{
_directory = directory;
}
/* ------------------------------------------------------------ */
/**
* @return True if ETag processing is done
*/
public boolean isEtags()
{
return _etags;
}
/* ------------------------------------------------------------ */
/**
* @param etags True if ETag processing is done
*/
public void setEtags(boolean etags)
{
_etags = etags;
}
/* ------------------------------------------------------------ */
@Override
public void doStart()
throws Exception
{
Context scontext = ContextHandler.getCurrentContext();
_context = (scontext==null?null:scontext.getContextHandler());
if (_context!=null)
_aliases=_context.isAliases();
if (!_aliases && !FileResource.getCheckAliases())
throw new IllegalStateException("Alias checking disabled");
super.doStart();
}
/* ------------------------------------------------------------ */
/**
* @return Returns the resourceBase.
*/
public Resource getBaseResource()
{
if (_baseResource==null)
return null;
return _baseResource;
}
/* ------------------------------------------------------------ */
/**
* @return Returns the base resource as a string.
*/
public String getResourceBase()
{
if (_baseResource==null)
return null;
return _baseResource.toString();
}
/* ------------------------------------------------------------ */
/**
* @param base The resourceBase to set.
*/
public void setBaseResource(Resource base)
{
_baseResource=base;
}
/* ------------------------------------------------------------ */
/**
* @param resourceBase The base resource as a string.
*/
public void setResourceBase(String resourceBase)
{
try
{
setBaseResource(Resource.newResource(resourceBase));
}
catch (Exception e)
{
LOG.warn(e.toString());
LOG.debug(e);
throw new IllegalArgumentException(resourceBase);
}
}
/* ------------------------------------------------------------ */
/**
* @return Returns the stylesheet as a Resource.
*/
public Resource getStylesheet()
{
if(_stylesheet != null)
{
return _stylesheet;
}
else
{
if(_defaultStylesheet == null)
{
try
{
_defaultStylesheet = Resource.newResource(this.getClass().getResource("/jetty-dir.css"));
}
catch(IOException e)
{
LOG.warn(e.toString());
LOG.debug(e);
}
}
return _defaultStylesheet;
}
}
/* ------------------------------------------------------------ */
/**
* @param stylesheet The location of the stylesheet to be used as a String.
*/
public void setStylesheet(String stylesheet)
{
try
{
_stylesheet = Resource.newResource(stylesheet);
if(!_stylesheet.exists())
{
LOG.warn("unable to find custom stylesheet: " + stylesheet);
_stylesheet = null;
}
}
catch(Exception e)
{
LOG.warn(e.toString());
LOG.debug(e);
throw new IllegalArgumentException(stylesheet.toString());
}
}
/* ------------------------------------------------------------ */
/**
* @return the cacheControl header to set on all static content.
*/
public String getCacheControl()
{
return _cacheControl.toString();
}
/* ------------------------------------------------------------ */
/**
* @param cacheControl the cacheControl header to set on all static content.
*/
public void setCacheControl(String cacheControl)
{
_cacheControl=cacheControl==null?null:new ByteArrayBuffer(cacheControl);
}
/* ------------------------------------------------------------ */
/*
*/
public Resource getResource(String path) throws MalformedURLException
{
if (path==null || !path.startsWith("/"))
throw new MalformedURLException(path);
Resource base = _baseResource;
if (base==null)
{
if (_context==null)
return null;
base=_context.getBaseResource();
if (base==null)
return null;
}
try
{
path=URIUtil.canonicalPath(path);
return base.addPath(path);
}
catch(Exception e)
{
LOG.ignore(e);
}
return null;
}
/* ------------------------------------------------------------ */
protected Resource getResource(HttpServletRequest request) throws MalformedURLException
{
String servletPath;
String pathInfo;
Boolean included = request.getAttribute(Dispatcher.INCLUDE_REQUEST_URI) != null;
if (included != null && included.booleanValue())
{
servletPath = (String)request.getAttribute(Dispatcher.INCLUDE_SERVLET_PATH);
pathInfo = (String)request.getAttribute(Dispatcher.INCLUDE_PATH_INFO);
if (servletPath == null && pathInfo == null)
{
servletPath = request.getServletPath();
pathInfo = request.getPathInfo();
}
}
else
{
servletPath = request.getServletPath();
pathInfo = request.getPathInfo();
}
String pathInContext=URIUtil.addPaths(servletPath,pathInfo);
return getResource(pathInContext);
}
/* ------------------------------------------------------------ */
public String[] getWelcomeFiles()
{
return _welcomeFiles;
}
/* ------------------------------------------------------------ */
public void setWelcomeFiles(String[] welcomeFiles)
{
_welcomeFiles=welcomeFiles;
}
/* ------------------------------------------------------------ */
protected Resource getWelcome(Resource directory) throws MalformedURLException, IOException
{
for (int i=0;i<_welcomeFiles.length;i++)
{
Resource welcome=directory.addPath(_welcomeFiles[i]);
if (welcome.exists() && !welcome.isDirectory())
return welcome;
}
return null;
}
/* ------------------------------------------------------------ */
/*
* @see org.eclipse.jetty.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
*/
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
if (baseRequest.isHandled())
return;
boolean skipContentBody = false;
if(!HttpMethods.GET.equals(request.getMethod()))
{
if(!HttpMethods.HEAD.equals(request.getMethod()))
{
//try another handler
super.handle(target, baseRequest, request, response);
return;
}
skipContentBody = true;
}
Resource resource = getResource(request);
if (resource==null || !resource.exists())
{
if (target.endsWith("/jetty-dir.css"))
{
resource = getStylesheet();
if (resource==null)
return;
response.setContentType("text/css");
}
else
{
//no resource - try other handlers
super.handle(target, baseRequest, request, response);
return;
}
}
if (!_aliases && resource.getAlias()!=null)
{
LOG.info(resource+" aliased to "+resource.getAlias());
return;
}
// We are going to serve something
baseRequest.setHandled(true);
if (resource.isDirectory())
{
if (!request.getPathInfo().endsWith(URIUtil.SLASH))
{
response.sendRedirect(response.encodeRedirectURL(URIUtil.addPaths(request.getRequestURI(),URIUtil.SLASH)));
return;
}
Resource welcome=getWelcome(resource);
if (welcome!=null && welcome.exists())
resource=welcome;
else
{
doDirectory(request,response,resource);
baseRequest.setHandled(true);
return;
}
}
// set some headers
long last_modified=resource.lastModified();
String etag=null;
if (_etags)
{
// simple handling of only a single etag
String ifnm = request.getHeader(HttpHeaders.IF_NONE_MATCH);
etag=resource.getWeakETag();
if (ifnm!=null && resource!=null && ifnm.equals(etag))
{
response.setStatus(HttpStatus.NOT_MODIFIED_304);
baseRequest.getResponse().getHttpFields().put(HttpHeaders.ETAG_BUFFER,etag);
return;
}
}
if (last_modified>0)
{
long if_modified=request.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE);
if (if_modified>0 && last_modified/1000<=if_modified/1000)
{
response.setStatus(HttpStatus.NOT_MODIFIED_304);
return;
}
}
Buffer mime=_mimeTypes.getMimeByExtension(resource.toString());
if (mime==null)
mime=_mimeTypes.getMimeByExtension(request.getPathInfo());
// set the headers
doResponseHeaders(response,resource,mime!=null?mime.toString():null);
response.setDateHeader(HttpHeaders.LAST_MODIFIED,last_modified);
if (_etags)
baseRequest.getResponse().getHttpFields().put(HttpHeaders.ETAG_BUFFER,etag);
if(skipContentBody)
return;
// Send the content
OutputStream out =null;
try {out = response.getOutputStream();}
catch(IllegalStateException e) {out = new WriterOutputStream(response.getWriter());}
// See if a short direct method can be used?
if (out instanceof AbstractHttpConnection.Output)
{
// TODO file mapped buffers
((AbstractHttpConnection.Output)out).sendContent(resource.getInputStream());
}
else
{
// Write content normally
resource.writeTo(out,0,resource.length());
}
}
/* ------------------------------------------------------------ */
protected void doDirectory(HttpServletRequest request,HttpServletResponse response, Resource resource)
throws IOException
{
if (_directory)
{
String listing = resource.getListHTML(request.getRequestURI(),request.getPathInfo().lastIndexOf("/") > 0);
response.setContentType("text/html; charset=UTF-8");
response.getWriter().println(listing);
}
else
response.sendError(HttpStatus.FORBIDDEN_403);
}
/* ------------------------------------------------------------ */
/** Set the response headers.
* This method is called to set the response headers such as content type and content length.
* May be extended to add additional headers.
* @param response
* @param resource
* @param mimeType
*/
protected void doResponseHeaders(HttpServletResponse response, Resource resource, String mimeType)
{
if (mimeType!=null)
response.setContentType(mimeType);
long length=resource.length();
if (response instanceof Response)
{
HttpFields fields = ((Response)response).getHttpFields();
if (length>0)
fields.putLongField(HttpHeaders.CONTENT_LENGTH_BUFFER,length);
if (_cacheControl!=null)
fields.put(HttpHeaders.CACHE_CONTROL_BUFFER,_cacheControl);
}
else
{
if (length>0)
response.setHeader(HttpHeaders.CONTENT_LENGTH,Long.toString(length));
if (_cacheControl!=null)
response.setHeader(HttpHeaders.CACHE_CONTROL,_cacheControl.toString());
}
}
}
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