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Exerimental Minimal Tomcat for Programmatic Use
/*
* 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.catalina.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.lang.reflect.Proxy;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import org.apache.juli.logging.Log;
import org.apache.tomcat.util.res.StringManager;
/**
* Custom subclass of ObjectInputStream that loads from the class loader for this web application. This
* allows classes defined only with the web application to be found correctly.
*
* @author Craig R. McClanahan
* @author Bip Thelin
*/
public final class CustomObjectInputStream extends ObjectInputStream {
private static final StringManager sm = StringManager.getManager(CustomObjectInputStream.class);
private static final WeakHashMap> reportedClassCache = new WeakHashMap<>();
/**
* The class loader we will use to resolve classes.
*/
private final ClassLoader classLoader;
private final Set reportedClasses;
private final Log log;
private final Pattern allowedClassNamePattern;
private final String allowedClassNameFilter;
private final boolean warnOnFailure;
/**
* Construct a new instance of CustomObjectInputStream without any filtering of deserialized classes.
*
* @param stream The input stream we will read from
* @param classLoader The class loader used to instantiate objects
*
* @exception IOException if an input/output error occurs
*/
public CustomObjectInputStream(InputStream stream, ClassLoader classLoader) throws IOException {
this(stream, classLoader, null, null, false);
}
/**
* Construct a new instance of CustomObjectInputStream with filtering of deserialized classes.
*
* @param stream The input stream we will read from
* @param classLoader The class loader used to instantiate objects
* @param log The logger to use to report any issues. It may only be null if the filterMode does
* not require logging
* @param allowedClassNamePattern The regular expression to use to filter deserialized classes. The fully qualified
* class name must match this pattern for deserialization to be allowed if
* filtering is enabled.
* @param warnOnFailure Should any failures be logged?
*
* @exception IOException if an input/output error occurs
*/
public CustomObjectInputStream(InputStream stream, ClassLoader classLoader, Log log,
Pattern allowedClassNamePattern, boolean warnOnFailure) throws IOException {
super(stream);
if (log == null && allowedClassNamePattern != null && warnOnFailure) {
throw new IllegalArgumentException(sm.getString("customObjectInputStream.logRequired"));
}
this.classLoader = classLoader;
this.log = log;
this.allowedClassNamePattern = allowedClassNamePattern;
if (allowedClassNamePattern == null) {
this.allowedClassNameFilter = null;
} else {
this.allowedClassNameFilter = allowedClassNamePattern.toString();
}
this.warnOnFailure = warnOnFailure;
Set reportedClasses;
synchronized (reportedClassCache) {
reportedClasses = reportedClassCache.get(classLoader);
}
if (reportedClasses == null) {
reportedClasses = ConcurrentHashMap.newKeySet();
Set original;
synchronized (reportedClassCache) {
original = reportedClassCache.putIfAbsent(classLoader, reportedClasses);
}
if (original != null) {
// Concurrent attempts to create the new Set. Make sure all
// threads use the first successfully added Set.
reportedClasses = original;
}
}
this.reportedClasses = reportedClasses;
}
/**
* Load the local class equivalent of the specified stream class description, by using the class loader assigned to
* this Context.
*
* @param classDesc Class description from the input stream
*
* @exception ClassNotFoundException if this class cannot be found
* @exception IOException if an input/output error occurs
*/
@Override
public Class resolveClass(ObjectStreamClass classDesc) throws ClassNotFoundException, IOException {
String name = classDesc.getName();
if (allowedClassNamePattern != null) {
boolean allowed = allowedClassNamePattern.matcher(name).matches();
if (!allowed) {
boolean doLog = warnOnFailure && reportedClasses.add(name);
String msg = sm.getString("customObjectInputStream.nomatch", name, allowedClassNameFilter);
if (doLog) {
log.warn(msg);
} else if (log.isDebugEnabled()) {
log.debug(msg);
}
throw new InvalidClassException(msg);
}
}
try {
return Class.forName(name, false, classLoader);
} catch (ClassNotFoundException e) {
try {
// Try also the superclass because of primitive types
return super.resolveClass(classDesc);
} catch (ClassNotFoundException e2) {
// Rethrow original exception, as it can have more information
// about why the class was not found. BZ 48007
throw e;
}
}
}
/**
* Return a proxy class that implements the interfaces named in a proxy class descriptor. Do this using the class
* loader assigned to this Context.
*/
@Override
protected Class resolveProxyClass(String[] interfaces) throws IOException, ClassNotFoundException {
Class[] cinterfaces = new Class[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
cinterfaces[i] = classLoader.loadClass(interfaces[i]);
}
try {
// No way to avoid this at the moment
@SuppressWarnings("deprecation")
Class proxyClass = Proxy.getProxyClass(classLoader, cinterfaces);
return proxyClass;
} catch (IllegalArgumentException e) {
throw new ClassNotFoundException(null, e);
}
}
}