/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.struts2.jasper.compiler;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import org.apache.struts2.jasper.Constants;
import org.apache.struts2.jasper.JspCompilationContext;
import org.apache.struts2.jasper.Options;
import org.apache.struts2.jasper.runtime.JspFactoryImpl;
import org.apache.struts2.jasper.security.SecurityClassLoad;
import org.apache.struts2.jasper.servlet.JspServletWrapper;
import javax.servlet.ServletContext;
import javax.servlet.jsp.JspFactory;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FilePermission;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.Policy;
import java.security.cert.Certificate;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Class for tracking JSP compile time file dependencies when the
* &060;%@include file="..."%&062; directive is used.
* <p/>
* A background thread periodically checks the files a JSP page
* is dependent upon. If a dpendent file changes the JSP page
* which included it is recompiled.
* <p/>
* Only used if a web application context is a directory.
*
* @author Glenn L. Nielsen
* @version $Revision: 466606 $
*/
public final class JspRuntimeContext implements Runnable {
// Logger
private Logger log = LoggerFactory.getLogger(JspRuntimeContext.class);
/*
* Counts how many times the webapp's JSPs have been reloaded.
*/
private int jspReloadCount;
/**
* Preload classes required at runtime by a JSP servlet so that
* we don't get a defineClassInPackage security exception.
*/
static {
JspFactoryImpl factory = new JspFactoryImpl();
SecurityClassLoad.securityClassLoad(factory.getClass().getClassLoader());
JspFactory.setDefaultFactory(factory);
}
// ----------------------------------------------------------- Constructors
/**
* Create a JspRuntimeContext for a web application context.
* <p/>
* Loads in any previously generated dependencies from file.
*
* @param context ServletContext for web application
*/
public JspRuntimeContext(ServletContext context, Options options) {
this.context = context;
this.options = options;
// Get the parent class loader
parentClassLoader =
(URLClassLoader) Thread.currentThread().getContextClassLoader();
if (parentClassLoader == null) {
parentClassLoader =
(URLClassLoader) this.getClass().getClassLoader();
}
if (log.isDebugEnabled()) {
if (parentClassLoader != null) {
log.debug(Localizer.getMessage("jsp.message.parent_class_loader_is",
parentClassLoader.toString()));
} else {
log.debug(Localizer.getMessage("jsp.message.parent_class_loader_is",
"<none>"));
}
}
initClassPath();
if (context instanceof org.apache.struts2.jasper.servlet.JspCServletContext) {
return;
}
if (System.getSecurityManager() != null) {
initSecurity();
}
// If this web application context is running from a
// directory, start the background compilation thread
String appBase = context.getRealPath("/");
if (!options.getDevelopment()
&& appBase != null
&& options.getCheckInterval() > 0) {
if (appBase.endsWith(File.separator)) {
appBase = appBase.substring(0, appBase.length() - 1);
}
String directory =
appBase.substring(appBase.lastIndexOf(File.separator));
threadName = threadName + "[" + directory + "]";
threadStart();
}
}
// ----------------------------------------------------- Instance Variables
/**
* This web applications ServletContext
*/
private ServletContext context;
private Options options;
private URLClassLoader parentClassLoader;
private PermissionCollection permissionCollection;
private CodeSource codeSource;
private String classpath;
/**
* Maps JSP pages to their JspServletWrapper's
*/
private Map jsps = Collections.synchronizedMap(new HashMap());
/**
* The background thread.
*/
private Thread thread = null;
/**
* The background thread completion semaphore.
*/
private boolean threadDone = false;
/**
* Name to register for the background thread.
*/
private String threadName = "JspRuntimeContext";
// ------------------------------------------------------ Public Methods
/**
* Add a new JspServletWrapper.
*
* @param jspUri JSP URI
* @param jsw Servlet wrapper for JSP
*/
public void addWrapper(String jspUri, JspServletWrapper jsw) {
jsps.remove(jspUri);
jsps.put(jspUri, jsw);
}
/**
* Get an already existing JspServletWrapper.
*
* @param jspUri JSP URI
* @return JspServletWrapper for JSP
*/
public JspServletWrapper getWrapper(String jspUri) {
return (JspServletWrapper) jsps.get(jspUri);
}
/**
* Remove a JspServletWrapper.
*
* @param jspUri JSP URI of JspServletWrapper to remove
*/
public void removeWrapper(String jspUri) {
jsps.remove(jspUri);
}
/**
* Returns the number of JSPs for which JspServletWrappers exist, i.e.,
* the number of JSPs that have been loaded into the webapp.
*
* @return The number of JSPs that have been loaded into the webapp
*/
public int getJspCount() {
return jsps.size();
}
/**
* Get the SecurityManager Policy CodeSource for this web
* applicaiton context.
*
* @return CodeSource for JSP
*/
public CodeSource getCodeSource() {
return codeSource;
}
/**
* Get the parent URLClassLoader.
*
* @return URLClassLoader parent
*/
public URLClassLoader getParentClassLoader() {
return parentClassLoader;
}
/**
* Get the SecurityManager PermissionCollection for this
* web application context.
*
* @return PermissionCollection permissions
*/
public PermissionCollection getPermissionCollection() {
return permissionCollection;
}
/**
* Process a "destory" event for this web application context.
*/
public void destroy() {
threadStop();
Iterator servlets = jsps.values().iterator();
while (servlets.hasNext()) {
((JspServletWrapper) servlets.next()).destroy();
}
}
/**
* Increments the JSP reload counter.
*/
public synchronized void incrementJspReloadCount() {
jspReloadCount++;
}
/**
* Resets the JSP reload counter.
*
* @param count Value to which to reset the JSP reload counter
*/
public synchronized void setJspReloadCount(int count) {
this.jspReloadCount = count;
}
/**
* Gets the current value of the JSP reload counter.
*
* @return The current value of the JSP reload counter
*/
public int getJspReloadCount() {
return jspReloadCount;
}
// -------------------------------------------------------- Private Methods
/**
* Method used by background thread to check the JSP dependencies
* registered with this class for JSP's.
*/
private void checkCompile() {
Object[] wrappers = jsps.values().toArray();
for (int i = 0; i < wrappers.length; i++) {
JspServletWrapper jsw = (JspServletWrapper) wrappers[i];
JspCompilationContext ctxt = jsw.getJspEngineContext();
// JspServletWrapper also synchronizes on this when
// it detects it has to do a reload
synchronized (jsw) {
try {
ctxt.compile();
} catch (FileNotFoundException ex) {
ctxt.incrementRemoved();
} catch (Throwable t) {
jsw.getServletContext().log("Background compile failed",
t);
}
}
}
}
/**
* The classpath that is passed off to the Java compiler.
*/
public String getClassPath() {
return classpath;
}
/**
* Method used to initialize classpath for compiles.
*/
private void initClassPath() {
URL[] urls = parentClassLoader.getURLs();
StringBuffer cpath = new StringBuffer();
String sep = System.getProperty("path.separator");
for (int i = 0; i < urls.length; i++) {
// Tomcat 4 can use URL's other than file URL's,
// a protocol other than file: will generate a
// bad file system path, so only add file:
// protocol URL's to the classpath.
if (urls[i].getProtocol().equals("file")) {
cpath.append((String) urls[i].getFile() + sep);
}
}
cpath.append(options.getScratchDir() + sep);
String cp = (String) context.getAttribute(Constants.SERVLET_CLASSPATH);
if (cp == null || cp.equals("")) {
cp = options.getClassPath();
}
classpath = cpath.toString() + cp;
if (log.isDebugEnabled()) {
log.debug("Compilation classpath initialized: " + getClassPath());
}
}
/**
* Method used to initialize SecurityManager data.
*/
private void initSecurity() {
// Setup the PermissionCollection for this web app context
// based on the permissions configured for the root of the
// web app context directory, then add a file read permission
// for that directory.
Policy policy = Policy.getPolicy();
if (policy != null) {
try {
// Get the permissions for the web app context
String docBase = context.getRealPath("/");
if (docBase == null) {
docBase = options.getScratchDir().toString();
}
String codeBase = docBase;
if (!codeBase.endsWith(File.separator)) {
codeBase = codeBase + File.separator;
}
File contextDir = new File(codeBase);
URL url = contextDir.getCanonicalFile().toURL();
codeSource = new CodeSource(url, (Certificate[]) null);
permissionCollection = policy.getPermissions(codeSource);
// Create a file read permission for web app context directory
if (!docBase.endsWith(File.separator)) {
permissionCollection.add
(new FilePermission(docBase, "read"));
docBase = docBase + File.separator;
} else {
permissionCollection.add
(new FilePermission
(docBase.substring(0, docBase.length() - 1), "read"));
}
docBase = docBase + "-";
permissionCollection.add(new FilePermission(docBase, "read"));
// Create a file read permission for web app tempdir (work)
// directory
String workDir = options.getScratchDir().toString();
if (!workDir.endsWith(File.separator)) {
permissionCollection.add
(new FilePermission(workDir, "read"));
workDir = workDir + File.separator;
}
workDir = workDir + "-";
permissionCollection.add(new FilePermission(workDir, "read"));
// Allow the JSP to access org.apache.struts2.jasper.runtime.HttpJspBase
permissionCollection.add(new RuntimePermission(
"accessClassInPackage.org.apache.struts2.jasper.runtime"));
if (parentClassLoader instanceof URLClassLoader) {
URL[] urls = parentClassLoader.getURLs();
String jarUrl = null;
String jndiUrl = null;
for (int i = 0; i < urls.length; i++) {
if (jndiUrl == null
&& urls[i].toString().startsWith("jndi:")) {
jndiUrl = urls[i].toString() + "-";
}
if (jarUrl == null
&& urls[i].toString().startsWith("jar:jndi:")
) {
jarUrl = urls[i].toString();
jarUrl = jarUrl.substring(0, jarUrl.length() - 2);
jarUrl = jarUrl.substring(0,
jarUrl.lastIndexOf('/')) + "/-";
}
}
if (jarUrl != null) {
permissionCollection.add(
new FilePermission(jarUrl, "read"));
permissionCollection.add(
new FilePermission(jarUrl.substring(4), "read"));
}
if (jndiUrl != null)
permissionCollection.add(
new FilePermission(jndiUrl, "read"));
}
} catch (Exception e) {
context.log("Security Init for context failed", e);
}
}
}
// -------------------------------------------------------- Thread Support
/**
* Start the background thread that will periodically check for
* changes to compile time included files in a JSP.
*
* @throws IllegalStateException if we should not be starting
* a background thread now
*/
protected void threadStart() {
// Has the background thread already been started?
if (thread != null) {
return;
}
// Start the background thread
threadDone = false;
thread = new Thread(this, threadName);
thread.setDaemon(true);
thread.start();
}
/**
* Stop the background thread that is periodically checking for
* changes to compile time included files in a JSP.
*/
protected void threadStop() {
if (thread == null) {
return;
}
threadDone = true;
thread.interrupt();
try {
thread.join();
} catch (InterruptedException e) {
;
}
thread = null;
}
/**
* Sleep for the duration specified by the <code>checkInterval</code>
* property.
*/
protected void threadSleep() {
try {
Thread.sleep(options.getCheckInterval() * 1000L);
} catch (InterruptedException e) {
;
}
}
// ------------------------------------------------------ Background Thread
/**
* The background thread that checks for changes to files
* included by a JSP and flags that a recompile is required.
*/
public void run() {
// Loop until the termination semaphore is set
while (!threadDone) {
// Wait for our check interval
threadSleep();
// Check for included files which are newer than the
// JSP which uses them.
try {
checkCompile();
} catch (Throwable t) {
log.error("Exception checking if recompile needed: ", t);
}
}
}
}