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Commit 8d6ef5cc authored by daryl herzmann's avatar daryl herzmann
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Merge pull request #386 from tevans/Revert_PR300 

Revert PR#300 (restore PluginClassLoader)
parents 9470b9b0 887dc0dc
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Showing with 121 additions and 777 deletions
src/java/org/jivesoftware/openfire/container/PluginClassLoader.java
View file @ 8d6ef5cc
......@@ -20,38 +20,24 @@
package org.jivesoftware.openfire.container;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.security.AccessControlException;
import java.security.CodeSource;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import org.jivesoftware.openfire.XMPPServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ClassLoader for plugins. It searches the plugin directory for classes and JAR
* files, then constructs a class loader for the resources found. Resources are
* loaded as follows:
* ClassLoader for plugins. It searches the plugin directory for classes
* and JAR files, then constructs a class loader for the resources found.
* Resources are loaded as follows:
* <ul>
* <li>Any JAR files in the <tt>lib</tt> will be added to the classpath.</li>
* <li>Any files in the classes directory will be added to the classpath.</li>
......@@ -60,686 +46,123 @@ import org.slf4j.LoggerFactory;
* @author Derek DeMoro
*/
public class PluginClassLoader extends URLClassLoader {
private static final Logger Log = LoggerFactory.getLogger(PluginClassLoader.class);
private static final String CLASS_FILE_SUFFIX = ".class";
private static final Manifest MANIFEST_UNKNOWN = new Manifest();
/**
* The cache of ResourceEntry for classes and resources we have loaded,
* keyed by resource path, not binary name. Path is used as the key since
* resources may be requested by binary name (classes) or path (other
* resources such as property files) and the mapping from binary name to
* path is unambiguous but the reverse mapping is ambiguous.
*/
protected final Map<String, ResourceEntry> resourceEntries = new ConcurrentHashMap<>();
/**
* Repositories managed by this class rather than the super class.
*/
private List<URL> localRepositories = new ArrayList<>();
private ClassLoader parent;
public PluginClassLoader() {
super(new URL[] {}, findParentClassLoader());
this.parent = findParentClassLoader();
}
/**
* Find the resource with the given name, and return an input stream that
* can be used for reading it. The search order is as described for
* <code>getResource()</code>, after checking to see if the resource data
* has been previously cached. If the resource cannot be found, return
* <code>null</code>.
*
* @param name
* Name of the resource to return an input stream for
*/
@Override
public InputStream getResourceAsStream(String name) {
if (Log.isDebugEnabled())
Log.debug("getResourceAsStream(" + name + ")");
InputStream stream = null;
// Check for a cached copy of this resource
stream = findLoadedResource(name);
if (stream != null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning stream from cache");
return (stream);
}
// Search local repositories
if (Log.isDebugEnabled())
Log.debug(" Searching local repositories");
URL url = findResource(name);
if (url != null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning stream from local");
stream = findLoadedResource(name);
try {
if (stream == null)
stream = url.openStream();
} catch (IOException e) {
// Ignore
}
if (stream != null)
return (stream);
}
// Delegate to parent unconditionally
if (Log.isDebugEnabled())
Log.debug(" Delegating to parent classloader unconditionally " + parent);
stream = parent.getResourceAsStream(name);
if (stream != null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning stream from parent");
return (stream);
}
// Resource was not found
if (Log.isDebugEnabled())
Log.debug(" --> Resource not found, returning null");
return (null);
}
/**
* Finds the resource with the given name if it has previously been loaded
* and cached by this class loader, and return an input stream to the
* resource data. If this resource has not been cached, return
* <code>null</code>.
*
* @param name
* Name of the resource to return
*/
protected InputStream findLoadedResource(String name) {
String path = nameToPath(name);
ResourceEntry entry = resourceEntries.get(path);
if (entry != null) {
if (entry.binaryContent != null)
return new ByteArrayInputStream(entry.binaryContent);
else {
try {
return entry.source.openStream();
} catch (IOException ioe) {
// Ignore
}
}
}
return null;
}
/**
* Find the specified resource in our local repository, and return a
* <code>URL</code> referring to it, or <code>null</code> if this resource
* cannot be found.
*
* @param name
* Name of the resource to be found
*/
@Override
public URL findResource(String name) {
if (Log.isDebugEnabled())
Log.debug(" findResource(" + name + ")");
URL url = null;
String path = nameToPath(name);
ResourceEntry entry = findResourceInternal(name, path, false);
if (entry != null) {
url = entry.source;
}
if (url == null) {
url = super.findResource(name);
}
if (Log.isDebugEnabled()) {
if (url != null)
Log.debug(" --> Returning '" + url.toString() + "'");
else
Log.debug(" --> Resource not found, returning null");
}
return (url);
}
/**
* Load the class with the specified name. This method searches for classes
* in the same manner as <code>loadClass(String, boolean)</code> with
* <code>false</code> as the second argument.
*
* @param name
* The binary name of the class to be loaded
*
* @exception ClassNotFoundException
* if the class was not found
*/
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
return (loadClass(name, false));
}
/**
* Load the class with the specified name, searching using the following
* algorithm until it finds and returns the class. If the class cannot be
* found, returns <code>ClassNotFoundException</code>.
* <ul>
* <li>Call <code>findLoadedClass(String)</code> to check if the class has
* already been loaded. If it has, the same <code>Class</code> object is
* returned.</li>
* <li>If the <code>delegate</code> property is set to <code>true</code>,
* call the <code>loadClass()</code> method of the parent class loader, if
* any.</li>
* <li>Call <code>findClass()</code> to find this class in our locally
* defined repositories.</li>
* <li>Call the <code>loadClass()</code> method of our parent class loader,
* if any.</li>
* </ul>
* If the class was found using the above steps, and the
* <code>resolve</code> flag is <code>true</code>, this method will then
* call <code>resolveClass(Class)</code> on the resulting Class object.
*
* @param name
* The binary name of the class to be loaded
* @param resolve
* If <code>true</code> then resolve the class
*
* @exception ClassNotFoundException
* if the class was not found
*/
@Override
public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
synchronized (getClassLoadingLock(name)) {
if (Log.isDebugEnabled())
Log.debug("loadClass(" + name + ", " + resolve + ")");
Class<?> clazz = null;
// Check our previously loaded local class cache
clazz = findLoadedClass0(name);
if (clazz != null) {
if (Log.isDebugEnabled())
Log.debug(" Returning class from cache");
if (resolve)
resolveClass(clazz);
return (clazz);
}
// Check our previously loaded class cache
clazz = findLoadedClass(name);
if (clazz != null) {
if (Log.isDebugEnabled())
Log.debug(" Returning class from cache");
if (resolve)
resolveClass(clazz);
return (clazz);
}
// Search local repositories
if (Log.isDebugEnabled())
Log.debug(" Searching local repositories");
try {
clazz = findClass(name);
if (clazz != null) {
if (Log.isDebugEnabled())
Log.debug(" Loading class from local repository");
if (resolve)
resolveClass(clazz);
return (clazz);
}
} catch (ClassNotFoundException e) {
// Ignore
}
// Delegate to parent unconditionally
if (Log.isDebugEnabled())
Log.debug(" Delegating to parent classloader at end: " + parent);
try {
clazz = Class.forName(name, false, parent);
if (clazz != null) {
if (Log.isDebugEnabled())
Log.debug(" Loading class from parent");
if (resolve)
resolveClass(clazz);
return (clazz);
}
} catch (ClassNotFoundException e) {
// Ignore
}
}
throw new ClassNotFoundException(name);
}
/**
* Find the specified class in our local repositories, if possible. If not
* found, throw <code>ClassNotFoundException</code>.
*
* @param name
* The binary name of the class to be loaded
*
* @exception ClassNotFoundException
* if the class was not found
*/
@Override
public Class<?> findClass(String name) throws ClassNotFoundException {
if (Log.isDebugEnabled())
Log.debug(" findClass(" + name + ")");
// Ask our superclass to locate this class, if possible
// (throws ClassNotFoundException if it is not found)
Class<?> clazz = null;
try {
if (Log.isTraceEnabled())
Log.trace(" findClassInternal(" + name + ")");
try {
clazz = findClassInternal(name);
} catch (AccessControlException ace) {
Log.warn("PluginClassLoader.findClassInternal(" + name + ") security exception: " + ace.getMessage(),
ace);
throw new ClassNotFoundException(name, ace);
} catch (RuntimeException e) {
if (Log.isTraceEnabled())
Log.trace(" -->RuntimeException Rethrown", e);
throw e;
}
if (clazz == null) {
try {
clazz = super.findClass(name);
} catch (AccessControlException ace) {
Log.warn(
"PluginClassLoader.findClassInternal(" + name + ") security exception: " + ace.getMessage(),
ace);
throw new ClassNotFoundException(name, ace);
} catch (RuntimeException e) {
if (Log.isTraceEnabled())
Log.trace(" -->RuntimeException Rethrown", e);
throw e;
}
}
if (clazz == null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning ClassNotFoundException");
throw new ClassNotFoundException(name);
}
} catch (ClassNotFoundException e) {
if (Log.isTraceEnabled())
Log.trace(" --> Passing on ClassNotFoundException");
throw e;
}
// Return the class we have located
if (Log.isTraceEnabled())
Log.debug(" Returning class " + clazz);
return (clazz);
}
/**
* Find specified class in local repositories.
*
* @param name
* The binary name of the class to be loaded
*
* @return the loaded class, or null if the class isn't found
*/
protected Class<?> findClassInternal(String name) {
String path = binaryNameToPath(name, true);
ResourceEntry entry = findResourceInternal(name, path, true);
if (entry == null) {
return null;
}
Class<?> clazz = entry.loadedClass;
if (clazz != null)
return clazz;
synchronized (getClassLoadingLock(name)) {
clazz = entry.loadedClass;
if (clazz != null)
return clazz;
if (entry.binaryContent == null) {
return null;
}
try {
clazz = defineClass(name, entry.binaryContent, 0, entry.binaryContent.length,
new CodeSource(entry.codeBase, entry.certificates));
} catch (UnsupportedClassVersionError ucve) {
throw new UnsupportedClassVersionError(ucve.getLocalizedMessage() + " " + name);
}
// Now the class has been defined, clear the elements of the local
// resource cache that are no longer required.
entry.loadedClass = clazz;
entry.binaryContent = null;
entry.codeBase = null;
entry.manifest = null;
entry.certificates = null;
// Retain entry.source in case of a getResourceAsStream() call on
// the class file after the class has been defined.
}
return clazz;
}
/**
* Find specified resource in local repositories.
*
* @return the loaded resource, or null if the resource isn't found
*/
protected ResourceEntry findResourceInternal(final String name, final String path, boolean manifestRequired) {
ResourceEntry entry = resourceEntries.get(path);
return entry;
}
/**
* Find the resource with the given name. A resource is some data (images,
* audio, text, etc.) that can be accessed by class code in a way that is
* independent of the location of the code. The name of a resource is a
* "/"-separated path name that identifies the resource. If the resource
* cannot be found, return <code>null</code>.
* <p>
* This method searches according to the following algorithm, returning as
* soon as it finds the appropriate URL. If the resource cannot be found,
* returns <code>null</code>.
* <ul>
* <li>If the <code>delegate</code> property is set to <code>true</code>,
* call the <code>getResource()</code> method of the parent class loader, if
* any.</li>
* <li>Call <code>findResource()</code> to find this resource in our locally
* defined repositories.</li>
* <li>Call the <code>getResource()</code> method of the parent class
* loader, if any.</li>
* </ul>
*
* @param name
* Name of the resource to return a URL for
*/
@Override
public URL getResource(String name) {
if (Log.isDebugEnabled())
Log.debug("getResource(" + name + ")");
URL url = null;
// Search local repositories
url = findResource(name);
if (url != null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning '" + url.toString() + "'");
return (url);
}
// Delegate to parent unconditionally if not already attempted
url = parent.getResource(name);
if (url != null) {
if (Log.isDebugEnabled())
Log.debug(" --> Returning '" + url.toString() + "'");
return (url);
}
// Resource was not found
if (Log.isDebugEnabled())
Log.debug(" --> Resource not found, returning null");
return (null);
}
/**
* Adds a directory to the class loader.
*
* @param directory
* the directory.
* @param developmentMode
* true if the plugin is running in development mode. This
* resolves classloader conflicts between the deployed plugin and
* development classes.
*/
public void addDirectory(File directory, boolean developmentMode) {
try {
// Add classes directory to classpath.
File classesDir = new File(directory, "classes");
if (classesDir.exists()) {
addResource(classesDir.toURI().toURL(), "/");
}
// Add i18n directory to classpath.
File databaseDir = new File(directory, "database");
if (databaseDir.exists()) {
addResource(databaseDir.toURI().toURL(), "/");
}
// Add i18n directory to classpath.
File i18nDir = new File(directory, "i18n");
if (i18nDir.exists()) {
addResource(i18nDir.toURI().toURL(), "/");
}
// Add web directory to classpath.
File webDir = new File(directory, "web");
if (webDir.exists()) {
addResource(webDir.toURI().toURL(), "/");
}
// Add lib directory to classpath.
File libDir = new File(directory, "lib");
File[] jars = libDir.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.endsWith(".jar") || name.endsWith(".zip");
}
});
if (jars != null) {
for (int i = 0; i < jars.length; i++) {
if (jars[i] != null && jars[i].isFile()) {
String jarFileUri = jars[i].toURI().toString() + "!/";
if (developmentMode) {
// Do not add plugin-pluginName.jar to classpath.
if (!jars[i].getName().equals("plugin-" + directory.getName() + ".jar")) {
addResource(new URL("jar", "", -1, jarFileUri), "/");
}
} else {
addResource(new URL("jar", "", -1, jarFileUri), "/");
}
}
}
}
} catch (MalformedURLException mue) {
Log.error(mue.getMessage(), mue);
}
}
/**
* Finds the class with the given name if it has previously been loaded and
* cached by this class loader, and return the Class object. If this class
* has not been cached, return <code>null</code>.
*
* @param name
* The binary name of the resource to return
*/
protected Class<?> findLoadedClass0(String name) {
String path = binaryNameToPath(name, true);
ResourceEntry entry = resourceEntries.get(path);
if (entry != null) {
return entry.loadedClass;
}
return null;
}
private String binaryNameToPath(String binaryName, boolean withLeadingSlash) {
// 1 for leading '/', 6 for ".class"
StringBuilder path = new StringBuilder(7 + binaryName.length());
if (withLeadingSlash) {
path.append('/');
}
path.append(binaryName.replace('.', '/'));
path.append(CLASS_FILE_SUFFIX);
return path.toString();
}
/**
* Add the given URL to the classpath for this class loader, caching the JAR
* file connection so it can be unloaded later
*
* @param file
* URL for the JAR file or directory to append to classpath
*/
public void addURLFile(URL file) {
addResource(file, "/");
}
/**
* Unload any JAR files that have been cached by this plugin
*/
public void unloadJarFiles() {
resourceEntries.clear();
}
private void addResource(URL url, String parent) {
// check file is directory and list files
try {
File file = new File(url.toURI());
if (file.isDirectory()) {
File[] files = file.listFiles();
for (File temp : files) {
if(temp.isDirectory()){
parent = String.format("%s%s/", parent, temp.getName());
}
addResource(temp.toURI().toURL(), parent);
}
return;
}
} catch (Exception e) {
// do nothing
}
try {
// check the resource is jar
URLConnection uc = url.openConnection();
if (uc instanceof JarURLConnection) {
uc.setUseCaches(true);
JarFile jarFile = ((JarURLConnection) uc).getJarFile();
localRepositories.add(url);
addJarResource(jarFile, url);
} else {
File file = new File(url.toURI());
ResourceEntry entry = new ResourceEntry();
entry.manifest = MANIFEST_UNKNOWN;
entry.source = url;
entry.codeBase = url;
entry.lastModified = file.lastModified();
entry.binaryContent = readBytes(new FileInputStream(file));
if (Log.isDebugEnabled())
Log.debug("add resource path:" + parent + file.getName());
resourceEntries.put(parent + file.getName(), entry);
}
} catch (Exception e) {
Log.warn("Failed to load plugin resource: " + url.toExternalForm());
}
}
/**
* add jar file entries to the loacl repositories
*/
private void addJarResource(JarFile jarFile, URL codebase) {
try {
Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry jarEntry = entries.nextElement();
ResourceEntry entry = new ResourceEntry();
entry.certificates = jarEntry.getCertificates();
entry.manifest = jarFile.getManifest();
entry.lastModified = jarEntry.getTime();
entry.binaryContent = readBytes(jarFile.getInputStream(jarEntry));
entry.codeBase = codebase;
if (Log.isDebugEnabled())
Log.debug("add resource path:/" + jarEntry.getName());
resourceEntries.put("/" + jarEntry.getName(), entry);
}
} catch (IOException e) {
Log.warn("Failed to load plugin lib resource: " + jarFile);
}
}
/**
* read bytes from inputstream
*/
private byte[] readBytes(InputStream is) throws IOException {
if (is == null) {
return null;
}
try {
ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = is.read(buff, 0, 100)) > 0) {
swapStream.write(buff, 0, rc);
}
byte[] result = swapStream.toByteArray();
return result;
} catch (IOException e) {
throw e;
} finally {
is.close();
}
}
private String nameToPath(String name) {
if (name.startsWith("/")) {
return name;
}
StringBuilder path = new StringBuilder(1 + name.length());
path.append('/');
path.append(name);
return path.toString();
}
/**
* Locates the best parent class loader based on context.
*
* @return the best parent classloader to use.
*/
private static ClassLoader findParentClassLoader() {
ClassLoader parent = XMPPServer.class.getClassLoader();
if (parent == null) {
parent = PluginClassLoader.class.getClassLoader();
}
if (parent == null) {
parent = ClassLoader.getSystemClassLoader();
}
return parent;
}
/**
* {@inheritDoc}
* <p>
* Note that list of URLs returned by this method may not be complete. The
* web application class loader accesses class loader resources via the
* {@link WebResourceRoot} which supports the arbitrary mapping of
* additional files, directories and contents of JAR files under
* WEB-INF/classes. Any such resources will not be included in the URLs
* returned here.
*/
@Override
public URL[] getURLs() {
ArrayList<URL> result = new ArrayList<>();
result.addAll(localRepositories);
result.addAll(Arrays.asList(super.getURLs()));
return result.toArray(new URL[result.size()]);
}
private static final Logger Log = LoggerFactory.getLogger(PluginClassLoader.class);
private List<JarURLConnection> cachedJarFiles = new ArrayList<JarURLConnection>();
public PluginClassLoader() {
super(new URL[] {}, findParentClassLoader());
}
/**
* Adds a directory to the class loader.
*
* @param directory the directory.
* @param developmentMode true if the plugin is running in development mode. This
* resolves classloader conflicts between the deployed plugin
* and development classes.
*/
public void addDirectory(File directory, boolean developmentMode) {
try {
// Add classes directory to classpath.
File classesDir = new File(directory, "classes");
if (classesDir.exists()) {
addURL(classesDir.toURI().toURL());
}
// Add i18n directory to classpath.
File databaseDir = new File(directory, "database");
if(databaseDir.exists()){
addURL(databaseDir.toURI().toURL());
}
// Add i18n directory to classpath.
File i18nDir = new File(directory, "i18n");
if(i18nDir.exists()){
addURL(i18nDir.toURI().toURL());
}
// Add web directory to classpath.
File webDir = new File(directory, "web");
if(webDir.exists()){
addURL(webDir.toURI().toURL());
}
// Add lib directory to classpath.
File libDir = new File(directory, "lib");
File[] jars = libDir.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(".jar") || name.endsWith(".zip");
}
});
if (jars != null) {
for (int i = 0; i < jars.length; i++) {
if (jars[i] != null && jars[i].isFile()) {
String jarFileUri = jars[i].toURI().toString() + "!/";
if (developmentMode) {
// Do not add plugin-pluginName.jar to classpath.
if (!jars[i].getName().equals("plugin-" + directory.getName() + ".jar")) {
addURLFile(new URL("jar", "", -1, jarFileUri));
}
} else {
addURLFile(new URL("jar", "", -1, jarFileUri));
}
}
}
}
}
catch (MalformedURLException mue) {
Log.error(mue.getMessage(), mue);
}
}
/**
* Add the given URL to the classpath for this class loader,
* caching the JAR file connection so it can be unloaded later
*
* @param file URL for the JAR file or directory to append to classpath
*/
public void addURLFile(URL file) {
try {
// open and cache JAR file connection
URLConnection uc = file.openConnection();
if (uc instanceof JarURLConnection) {
uc.setUseCaches(true);
((JarURLConnection) uc).getManifest();
cachedJarFiles.add((JarURLConnection)uc);
}
} catch (Exception e) {
Log.warn("Failed to cache plugin JAR file: " + file.toExternalForm());
}
addURL(file);
}
/**
* Unload any JAR files that have been cached by this plugin
*/
public void unloadJarFiles() {
for (JarURLConnection url : cachedJarFiles) {
try {
Log.info("Unloading plugin JAR file " + url.getJarFile().getName());
url.getJarFile().close();
} catch (Exception e) {
Log.error("Failed to unload JAR file", e);
}
}
}
/**
* Locates the best parent class loader based on context.
*
* @return the best parent classloader to use.
*/
private static ClassLoader findParentClassLoader() {
ClassLoader parent = XMPPServer.class.getClassLoader();
if (parent == null) {
parent = PluginClassLoader.class.getClassLoader();
}
if (parent == null) {
parent = ClassLoader.getSystemClassLoader();
}
return parent;
}
}
src/java/org/jivesoftware/openfire/container/ResourceEntry.java deleted 100644 → 0
View file @ 9470b9b0
/**
* $RCSfile$
* $Revision: 2993 $
* $Date: 2005-10-24 18:11:33 -0300 (Mon, 24 Oct 2005) $
*
* Copyright (C) 2004-2008 Jive Software. All rights reserved.
*
* Licensed 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.jivesoftware.openfire.container;
import java.net.URL;
import java.security.cert.Certificate;
import java.util.jar.Manifest;
/**
* Resource entry.
*
* @author wmz7year
*/
public class ResourceEntry {
/**
* The "last modified" time of the origin file at the time this class
* was loaded, in milliseconds since the epoch.
*/
public long lastModified = -1;
/**
* Binary content of the resource.
*/
public byte[] binaryContent = null;
/**
* Loaded class.
*/
public volatile Class<?> loadedClass = null;
/**
* URL source from where the object was loaded.
*/
public URL source = null;
/**
* URL of the codebase from where the object was loaded.
*/
public URL codeBase = null;
/**
* Manifest (if the resource was loaded from a JAR).
*/
public Manifest manifest = null;
/**
* Certificates (if the resource was loaded from a JAR).
*/
public Certificate[] certificates = null;
}
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