JarWarResourceSet.java
/*
* 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.webresources;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
import org.apache.tomcat.util.buf.UriUtil;
/**
* Represents a {@link org.apache.catalina.WebResourceSet} based on a JAR file that is nested inside a packed WAR file.
* This is only intended for internal use within Tomcat and therefore cannot be created via configuration.
*/
public class JarWarResourceSet extends AbstractArchiveResourceSet {
private final String archivePath;
/**
* Creates a new {@link org.apache.catalina.WebResourceSet} based on a JAR file that is nested inside a WAR.
*
* @param root The {@link WebResourceRoot} this new {@link org.apache.catalina.WebResourceSet} will be added
* to.
* @param webAppMount The path within the web application at which this {@link org.apache.catalina.WebResourceSet}
* will be mounted.
* @param base The absolute path to the WAR file on the file system in which the JAR is located.
* @param archivePath The path within the WAR file where the JAR file is located.
* @param internalPath The path within this new {@link org.apache.catalina.WebResourceSet} where resources will be
* served from. E.g. for a resource JAR, this would be "META-INF/resources"
*
* @throws IllegalArgumentException if the webAppMount or internalPath is not valid (valid paths must start with
* '/')
*/
public JarWarResourceSet(WebResourceRoot root, String webAppMount, String base, String archivePath,
String internalPath) throws IllegalArgumentException {
setRoot(root);
setWebAppMount(webAppMount);
setBase(base);
this.archivePath = archivePath;
setInternalPath(internalPath);
if (getRoot().getState().isAvailable()) {
try {
start();
} catch (LifecycleException e) {
throw new IllegalStateException(e);
}
}
}
@Override
protected WebResource createArchiveResource(JarEntry jarEntry, String webAppPath, Manifest manifest) {
return new JarWarResource(this, webAppPath, getBaseUrlString(), jarEntry, archivePath);
}
/**
* {@inheritDoc}
* <p>
* JarWar can't optimise for a single resource so the Map is always returned.
*/
@Override
protected Map<String, JarEntry> getArchiveEntries(boolean single) {
synchronized (archiveLock) {
if (archiveEntries == null) {
JarFile warFile = null;
InputStream jarFileIs = null;
archiveEntries = new HashMap<>();
boolean multiRelease = false;
try {
warFile = openJarFile();
JarEntry jarFileInWar = warFile.getJarEntry(archivePath);
jarFileIs = warFile.getInputStream(jarFileInWar);
try (TomcatJarInputStream jarIs = new TomcatJarInputStream(jarFileIs)) {
JarEntry entry = jarIs.getNextJarEntry();
while (entry != null) {
archiveEntries.put(entry.getName(), entry);
entry = jarIs.getNextJarEntry();
}
Manifest m = jarIs.getManifest();
setManifest(m);
if (m != null) {
String value = m.getMainAttributes().getValue("Multi-Release");
if (value != null) {
multiRelease = Boolean.parseBoolean(value);
}
}
// Hack to work-around JarInputStream swallowing these
// entries. TomcatJarInputStream is used above which
// extends JarInputStream and the method that creates
// the entries over-ridden so we can a) tell if the
// entries are present and b) cache them so we can
// access them here.
entry = jarIs.getMetaInfEntry();
if (entry != null) {
archiveEntries.put(entry.getName(), entry);
}
entry = jarIs.getManifestEntry();
if (entry != null) {
archiveEntries.put(entry.getName(), entry);
}
}
if (multiRelease) {
processArchivesEntriesForMultiRelease();
}
} catch (IOException ioe) {
// Should never happen
archiveEntries = null;
throw new IllegalStateException(ioe);
} finally {
if (warFile != null) {
closeJarFile();
}
if (jarFileIs != null) {
try {
jarFileIs.close();
} catch (IOException e) {
// Ignore
}
}
}
}
return archiveEntries;
}
}
protected void processArchivesEntriesForMultiRelease() {
int targetVersion = Runtime.version().feature();
Map<String, VersionedJarEntry> versionedEntries = new HashMap<>();
Iterator<Entry<String, JarEntry>> iter = archiveEntries.entrySet().iterator();
while (iter.hasNext()) {
Entry<String, JarEntry> entry = iter.next();
String name = entry.getKey();
if (name.startsWith("META-INF/versions/")) {
// Remove the multi-release version
iter.remove();
// Get the base name and version for this versioned entry
int i = name.indexOf('/', 18);
if (i > 0) {
String baseName = name.substring(i + 1);
int version = Integer.parseInt(name.substring(18, i));
// Ignore any entries targeting for a later version than
// the target for this runtime
if (version <= targetVersion) {
VersionedJarEntry versionedJarEntry = versionedEntries.get(baseName);
if (versionedJarEntry == null) {
// No versioned entry found for this name. Create
// one.
versionedEntries.put(baseName, new VersionedJarEntry(version, entry.getValue()));
} else {
// Ignore any entry for which we have already found
// a later version
if (version > versionedJarEntry.getVersion()) {
// Replace the entry targeted at an earlier
// version
versionedEntries.put(baseName, new VersionedJarEntry(version, entry.getValue()));
}
}
}
}
}
}
for (Entry<String, VersionedJarEntry> versionedJarEntry : versionedEntries.entrySet()) {
archiveEntries.put(versionedJarEntry.getKey(), versionedJarEntry.getValue().getJarEntry());
}
}
/**
* {@inheritDoc}
* <p>
* Should never be called since {@link #getArchiveEntries(boolean)} always returns a Map.
*/
@Override
protected JarEntry getArchiveEntry(String pathInArchive) {
throw new IllegalStateException(sm.getString("jarWarResourceSet.codingError"));
}
@Override
protected boolean isMultiRelease() {
// This always returns false otherwise the superclass will call
// #getArchiveEntry(String)
return false;
}
// -------------------------------------------------------- Lifecycle methods
@Override
protected void initInternal() throws LifecycleException {
try (JarFile warFile = new JarFile(getBase())) {
JarEntry jarFileInWar = warFile.getJarEntry(archivePath);
InputStream jarFileIs = warFile.getInputStream(jarFileInWar);
try (JarInputStream jarIs = new JarInputStream(jarFileIs)) {
setManifest(jarIs.getManifest());
}
} catch (IOException ioe) {
throw new IllegalArgumentException(ioe);
}
try {
setBaseUrl(UriUtil.buildJarSafeUrl(new File(getBase())));
} catch (MalformedURLException e) {
throw new IllegalArgumentException(e);
}
}
private static final class VersionedJarEntry {
private final int version;
private final JarEntry jarEntry;
VersionedJarEntry(int version, JarEntry jarEntry) {
this.version = version;
this.jarEntry = jarEntry;
}
public int getVersion() {
return version;
}
public JarEntry getJarEntry() {
return jarEntry;
}
}
}