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PHPJavaBridge server (soluble fork)
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/*
* Copyright (C) 2003-2007 Jost Boekemeier
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package io.soluble.pjb.servlet;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import io.soluble.pjb.bridge.JavaBridge;
import io.soluble.pjb.bridge.Request;
import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.http.AbstractChannelName;
import io.soluble.pjb.bridge.http.ContextFactory;
import io.soluble.pjb.bridge.http.ContextServer;
/**
* Handles requests from PHP clients. When Apache, IIS or php
* (cli) or php-cgi is used as a front-end, this servlet handles PUT
* requests and then re-directs to a private (socket- or pipe-)
* communication channel. This is the fastest mechanism to connect
* php and java. It is even 1.5 times faster than local ("unix
* domain") sockets used by the io.soluble.pjb.JavaBridge standalone
* listener.
*
* To enable fcg/servlet debug code start the servlet engine with -Dio.soluble.pjb.default_log_level=6.
* For example: java -Dio.soluble.pjb.default_log_level=6 -jar /opt/jakarta-tomcat-5.5.9/bin/bootstrap.jar
*
* There cannot be more than one PhpJavaServlet instance per web application. If you extend from this class, make sure to change
* the .phpjavabridge => PhpJavaServlet mapping in the WEB-INF/web.xml.
*/
public /*singleton*/ class PhpJavaServlet extends HttpServlet {
private static final long serialVersionUID = 3257854259629144372L;
private ContextServer contextServer;
protected int logLevel = -1;
private Util.Logger logger;
protected boolean promiscuous = false;
// workaround for a bug in jboss server, which uses the log4j port 4445 for its internal purposes(!)
private boolean isJBoss = false;
protected int maxKeepAliveRequests;
protected int keepAliveTimeout;
private String keepAliveParam;
/**
* {@inheritDoc}
*/
@Override
public void init(ServletConfig config) throws ServletException {
maxKeepAliveRequests = ServletUtil.getMBeanProperty("*:type=Connector,port=8080", "maxKeepAliveRequests");
keepAliveTimeout = ServletUtil.getMBeanProperty("*:type=Connector,port=8080", "keepAliveTimeout");
StringBuilder buf = new StringBuilder("timeout=");
buf.append(keepAliveTimeout);
buf.append(", max=");
buf.append(maxKeepAliveRequests);
// use redirect if maxKeepAliveRequests and keepAliveTimeout are not set to infinity
promiscuous = true;
keepAliveParam = buf.toString();
String servletContextName = ServletUtil.getRealPath(config.getServletContext(), "");
if (servletContextName == null) servletContextName = "";
ServletContext ctx = config.getServletContext();
String value = ctx.getInitParameter("promiscuous");
if (value == null) value = "";
value = value.trim();
value = value.toLowerCase();
if (value.equals("off") || value.equals("false")) promiscuous = false;
if (value.equals("on") || value.equals("true")) promiscuous = true;
contextServer = ContextLoaderListener.getContextLoaderListener(ctx).getContextServer();
super.init(config);
String name = ctx.getServerInfo();
if (name != null && (name.startsWith("JBoss"))) isJBoss = true;
logger = new Util.Logger(!isJBoss, new Logger());
Util.setDefaultLogger(logger);
if (Util.VERSION != null)
log("PHP/Java Bridge servlet " + servletContextName + " version " + Util.VERSION + " ready.");
else
log("PHP/Java Bridge servlet " + servletContextName + " ready.");
}
/**
* {@inheritDoc}
*/
@Override
public void destroy() {
super.destroy();
}
/**
* This hook can be used to create a custom context factory. The default implementation checks if there's a ContextFactory
* by calling ContextFactory.get(req.getHeader("X_JAVABRIDGE_CONTEXT"), credentials);
* If it doesn't exist, a new RemoteServletContextFactory is created.
* This procedure should set the response header X_JAVABRIDGE_CONTEXT as a side effect.
*
* @param req The HttpServletRequest
* @param res The HttpServletResponse
* @return The (new) ServletContextFactory.
*/
protected SimpleServletContextFactory getContextFactory(HttpServletRequest req, HttpServletResponse res) {
JavaBridge bridge;
SimpleServletContextFactory ctx = null;
String id = req.getHeader(Util.X_JAVABRIDGE_CONTEXT);
if (id != null) ctx = (SimpleServletContextFactory) ContextFactory.get(id);
if (ctx == null) {
ctx = (SimpleServletContextFactory) RemoteServletContextFactory.addNew(this, getServletContext(), null, req, res); // no session sharing
bridge = ctx.getBridge();
bridge.logDebug("HTTP request");
} else {
bridge = ctx.getBridge();
bridge.logDebug("redirect");
}
updateRequestLogLevel(bridge);
res.setHeader(Util.X_JAVABRIDGE_CONTEXT, ctx.getId());
return ctx;
}
/**
* Set the log level from the servlet into the bridge
*
* @param bridge The JavaBridge from the ContextFactory.
*/
protected void updateRequestLogLevel(JavaBridge bridge) {
if (logLevel > -1) bridge.logLevel = logLevel;
}
/**
*
* This hook can be used to suspend the termination of the servlet until the (Remote-)ServletContextFactory is finished.
* It may be useful if one wants to access the Servlet, ServletContext or ServletRequest from a remote PHP script.
* The notification comes from the php script when it is running as a sub component of the J2EE server or servlet engine.
*
* The default is to not wait for a local ServletContextFactory (the ContextFactory is passed from the PhpCGIServlet)
* and to wait RemoteContextFactory for 30 seconds.
*
* @param ctx The (Remote-) ContextFactory.
*/
protected void waitForContext(SimpleServletContextFactory ctx) {
try {
ctx.waitFor(Util.MAX_WAIT);
} catch (InterruptedException e) {
Util.printStackTrace(e);
}
}
/**
* Handle a redirected connection. The local channel is more than 50
* times faster than the HTTP tunnel. Used by Apache and cgi.
*
* @param req
* @param res
* @throws ServletException
* @throws IOException
*/
protected void handleLocalConnection(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
InputStream sin = null;
ByteArrayOutputStream sout;
OutputStream resOut = null;
SimpleServletContextFactory ctx = getContextFactory(req, res);
JavaBridge bridge = ctx.getBridge();
ctx.setSessionFactory(req);
bridge.in = sin = req.getInputStream();
bridge.out = sout = new ByteArrayOutputStream();
Request r = bridge.request = new Request(bridge);
if (r.init(sin, sout)) {
AbstractChannelName channelName = contextServer.getChannelName(ctx);
res.setHeader("X_JAVABRIDGE_REDIRECT", channelName.getName());
// start the context runner before generating the first response
contextServer.start(channelName, logger);
// generate response
if (!r.handleOneRequest()) throw new IOException("parse error");
// redirect and re-open
res.setContentLength(sout.size());
resOut = res.getOutputStream();
sout.writeTo(resOut);
if (bridge.logLevel > 3) bridge.logDebug("redirecting to port# " + channelName);
sin.close();
try {
res.flushBuffer();
} catch (IOException t) {
Util.printStackTrace(t);
} // resin ignores resOut.close()
try {
resOut.close();
} catch (IOException t) {
Util.printStackTrace(t);
} // Sun Java System AS 9 ignores flushBuffer()
this.waitForContext(ctx);
} else {
Util.warn("handleLocalConnection init failed");
ctx.destroy();
}
}
/**
* Only for internal use
*/
public static String getHeader(String key, HttpServletRequest req) {
String val = req.getHeader(key);
if (val == null) return null;
if (val.length() == 0) val = null;
return val;
}
protected void handleHttpConnection(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
RemoteHttpServletContextFactory ctx = new RemoteHttpServletContextFactory(this, getServletContext(), req, req, res);
res.setHeader(Util.X_JAVABRIDGE_CONTEXT, ctx.getId());
res.setHeader("Pragma", "no-cache");
res.setHeader("Cache-Control", "no-cache");
res.setHeader("Keep-Alive", keepAliveParam);
try {
ctx.getBridge().handleRequests(req.getInputStream(), res.getOutputStream());
} finally {
ctx.destroy();
}
}
private static final String LOCAL_ADDR = "127.0.0.1";
protected void handlePut(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
if (Util.logLevel > 3) Util.logDebug("doPut:" + req.getRequestURL());
boolean isLocal = LOCAL_ADDR.equals(req.getRemoteAddr());
boolean isHttps = req.isSecure();
if (contextServer != null && contextServer.isAvailable(null) && (isLocal || (!isLocal && promiscuous)) && !isHttps)
handleLocalConnection(req, res); /* re-direct */
else
handleHttpConnection(req, res);
}
/**
* Dispatcher for the "http tunnel", "local channel" or "override redirect".
*/
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
try {
handlePut(req, res);
} catch (RuntimeException e) {
Util.printStackTrace(e);
throw new ServletException(e);
} catch (IOException | ServletException e) {
Util.printStackTrace(e);
throw e;
}
}
/**
* For backward compatibility
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String uri = req.getRequestURI();
req.getRequestDispatcher(uri.substring(0, uri.length() - 10)).forward(req, res);
}
}