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//
// ========================================================================
// 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.servlet;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.UnavailableException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletRequestWrapper;
import jakarta.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.pathmap.MatchedResource;
import org.eclipse.jetty.server.Dispatcher;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.HandlerWrapper;
import org.eclipse.jetty.util.ArrayUtil;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.thread.AutoLock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Dynamic Servlet Invoker.
* This servlet invokes anonymous servlets that have not been defined
* in the web.xml or by other means. The first element of the pathInfo
* of a request passed to the envoker is treated as a servlet name for
* an existing servlet, or as a class name of a new servlet.
* This servlet is normally mapped to /servlet/*
* This servlet support the following initParams:
*
* nonContextServlets If false, the invoker can only load
* servlets from the contexts classloader.
* This is false by default and setting this
* to true may have security implications.
*
* verbose If true, log dynamic loads
*
* * All other parameters are copied to the
* each dynamic servlet as init parameters
*
*
* @version $Id: Invoker.java 4780 2009-03-17 15:36:08Z jesse $
*/
@SuppressWarnings("serial")
public class Invoker extends HttpServlet
{
private static final Logger LOG = LoggerFactory.getLogger(Invoker.class);
private ContextHandler _contextHandler;
private ServletHandler _servletHandler;
private MatchedResource _invokerEntry;
private Map _parameters;
private boolean _nonContextServlets;
private boolean _verbose;
@Override
public void init()
{
ServletContext config = getServletContext();
_contextHandler = ((ContextHandler.Context)config).getContextHandler();
Handler handler = _contextHandler.getHandler();
while (handler != null && !(handler instanceof ServletHandler) && (handler instanceof HandlerWrapper))
{
handler = ((HandlerWrapper)handler).getHandler();
}
_servletHandler = (ServletHandler)handler;
Enumeration e = getInitParameterNames();
while (e.hasMoreElements())
{
String param = e.nextElement();
String value = getInitParameter(param);
String lvalue = value.toLowerCase(Locale.ENGLISH);
if ("nonContextServlets".equals(param))
{
_nonContextServlets = value.length() > 0 && lvalue.startsWith("t");
}
if ("verbose".equals(param))
{
_verbose = value.length() > 0 && lvalue.startsWith("t");
}
else
{
if (_parameters == null)
_parameters = new HashMap();
_parameters.put(param, value);
}
}
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// Get the requested path and info
boolean included = false;
String servletPath = (String)request.getAttribute(Dispatcher.INCLUDE_SERVLET_PATH);
if (servletPath == null)
servletPath = request.getServletPath();
else
included = true;
String pathInfo = (String)request.getAttribute(Dispatcher.INCLUDE_PATH_INFO);
if (pathInfo == null)
pathInfo = request.getPathInfo();
// Get the servlet class
String servlet = pathInfo;
if (servlet == null || servlet.length() <= 1)
{
response.sendError(404);
return;
}
int i0 = servlet.charAt(0) == '/' ? 1 : 0;
int i1 = servlet.indexOf('/', i0);
servlet = i1 < 0 ? servlet.substring(i0) : servlet.substring(i0, i1);
// look for a named holder
ServletHolder[] holders = _servletHandler.getServlets();
ServletHolder holder = getHolder(holders, servlet);
if (holder != null)
{
// Found a named servlet (from a user's web.xml file) so
// now we add a mapping for it
if (LOG.isDebugEnabled())
LOG.debug("Adding servlet mapping for named servlet: {}:{}/*", servlet, URIUtil.addPaths(servletPath, servlet));
ServletMapping mapping = new ServletMapping();
mapping.setServletName(servlet);
mapping.setPathSpec(URIUtil.addPaths(servletPath, servlet) + "/*");
_servletHandler.setServletMappings(ArrayUtil.addToArray(_servletHandler.getServletMappings(), mapping, ServletMapping.class));
}
else
{
// look for a class mapping
if (servlet.endsWith(".class"))
servlet = servlet.substring(0, servlet.length() - 6);
if (servlet == null || servlet.length() == 0)
{
response.sendError(404);
return;
}
try (AutoLock l = _servletHandler.lock())
{
// find the entry for the invoker (me)
_invokerEntry = _servletHandler.getMatchedServlet(servletPath);
// Check for existing mapping (avoid threaded race).
String path = URIUtil.addPaths(servletPath, servlet);
MatchedResource entry = _servletHandler.getMatchedServlet(path);
if (entry != null && !entry.getResource().equals(_invokerEntry.getResource()))
{
// Use the holder
holder = entry.getResource().getServletHolder();
}
else
{
// Make a holder
if (LOG.isDebugEnabled())
LOG.debug("Making new servlet={} with path={}/*", servlet, path);
holder = _servletHandler.addServletWithMapping(servlet, path + "/*");
if (_parameters != null)
holder.setInitParameters(_parameters);
try
{
holder.start();
}
catch (Exception e)
{
LOG.debug("Unable to start {}", holder, e);
throw new UnavailableException(e.toString());
}
// Check it is from an allowable classloader
if (!_nonContextServlets)
{
Object s = holder.getServlet();
if (_contextHandler.getClassLoader() !=
s.getClass().getClassLoader())
{
try
{
holder.stop();
}
catch (Exception e)
{
LOG.trace("IGNORED", e);
}
LOG.warn("Dynamic servlet {} not loaded from context {}", s, request.getContextPath());
throw new UnavailableException("Not in context");
}
}
if (_verbose && LOG.isDebugEnabled())
LOG.debug("Dynamic load '{}' at {}", servlet, path);
}
}
}
if (holder != null)
{
final Request baseRequest = Request.getBaseRequest(request);
holder.prepare(baseRequest, request, response);
holder.handle(baseRequest,
new InvokedRequest(request, included, servlet, servletPath, pathInfo),
response);
}
else
{
LOG.info("Can't find holder for servlet: {}", servlet);
response.sendError(404);
}
}
class InvokedRequest extends HttpServletRequestWrapper
{
String _servletPath;
String _pathInfo;
boolean _included;
InvokedRequest(HttpServletRequest request,
boolean included,
String name,
String servletPath,
String pathInfo)
{
super(request);
_included = included;
_servletPath = URIUtil.addPaths(servletPath, name);
_pathInfo = pathInfo.substring(name.length() + 1);
if (_pathInfo.length() == 0)
_pathInfo = null;
}
@Override
public String getServletPath()
{
if (_included)
return super.getServletPath();
return _servletPath;
}
@Override
public String getPathInfo()
{
if (_included)
return super.getPathInfo();
return _pathInfo;
}
@Override
public Object getAttribute(String name)
{
if (_included)
{
if (name.equals(Dispatcher.INCLUDE_REQUEST_URI))
return URIUtil.addPaths(URIUtil.addPaths(getContextPath(), _servletPath), _pathInfo);
if (name.equals(Dispatcher.INCLUDE_PATH_INFO))
return _pathInfo;
if (name.equals(Dispatcher.INCLUDE_SERVLET_PATH))
return _servletPath;
}
return super.getAttribute(name);
}
}
private ServletHolder getHolder(ServletHolder[] holders, String servlet)
{
if (holders == null)
return null;
ServletHolder holder = null;
for (int i = 0; holder == null && i < holders.length; i++)
{
if (holders[i].getName().equals(servlet))
{
holder = holders[i];
}
}
return holder;
}
}
