org.glassfish.appclient.client.acc.HTTPInputArchive Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.appclient.client.acc;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.api.deployment.archive.ReadableArchive;
import com.sun.enterprise.deploy.shared.AbstractReadableArchive;
import org.jvnet.hk2.annotations.Service;
import org.glassfish.hk2.api.PerLookup;
/**
* Implements ReadableArchive for the http (and https) protocol to support
* launches of app clients using Java Web Start.
*
* Although the JARs are stored as JARs in the Java Web Start cache,
* Java Web Start hides the actual location where the cached JAR resides.
* So this implementation does not rely on the JARs location but uses
* URLs to access the archive itself and its elements.
*
* @author tjquinn
*/
@Service(name="http")
@PerLookup
public class HTTPInputArchive extends AbstractReadableArchive {
private URI archiveURI = null;
private URL archiveURL = null;
/** caches the manifest so we read if from the JAR at most once */
private Manifest cachedManifest = null;
/** caches the archive size to avoid opening connections to it multiple times. The real cached value will never be -2 */
private int cachedArchiveSize = -2;
/** caches the list of all entries; reused for subsequent calls to the entries methods */
private Collection cachedEntryNames = null;
/** caches whether or not this archive exists */
private Boolean exists;
@Override
public InputStream getEntry(String name) throws IOException {
try {
return entryURL(name).openStream();
} catch (FileNotFoundException e) {
return null;
}
}
private URL entryURL(String name) throws MalformedURLException {
if (! (name.charAt(0) == '/')) {
name = "/" + name;
}
return new URL("jar:" + archiveURI.toASCIIString() + "!" + name);
}
@Override
public synchronized boolean exists(String name) throws IOException {
if (cachedEntryNames != null) {
return cachedEntryNames.contains(name);
}
return getEntry(name) != null;
}
@Override
public long getEntrySize(String name) {
try {
URLConnection cnx = entryURL(name).openConnection();
return cnx.getContentLength();
} catch (Exception ex) {
Logger.getLogger(HTTPInputArchive.class.getName()).log(Level.SEVERE, null, ex);
return -1;
}
}
@Override
public void open(URI uri) throws IOException {
archiveURI = uri;
archiveURL = uri.toURL();
}
@Override
public ReadableArchive getSubArchive(String name) throws IOException {
throw new UnsupportedOperationException("Nested archives not supported in ACC");
}
@Override
public boolean exists() {
if (exists != null) {
return exists.booleanValue();
}
InputStream is = null;
exists = Boolean.FALSE;
try {
is = archiveURL.openStream();
exists = Boolean.TRUE;
is.close();
} finally {
return exists.booleanValue();
}
}
@Override
public boolean delete() {
throw new UnsupportedOperationException("delete not supported");
}
@Override
public boolean renameTo(String name) {
throw new UnsupportedOperationException("renameTo supported");
}
@Override
public void close() throws IOException {
// archiveURI = null;
// archiveURL = null;
}
@Override
public Enumeration entries() {
/*
* This case is easy - just wrap an Enumerator interface around
* an iterator we can get directly from the names cache.
*/
try {
final Iterator it = entryNames().iterator();
return new Enumeration() {
@Override
public boolean hasMoreElements() {
return it.hasNext();
}
@Override
public String nextElement() {
return it.next();
}
};
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Returns a collection containing the names of all entries in the
* archive.
*
* @return
* @throws IOException
*/
private synchronized Collection entryNames() throws IOException {
if (cachedEntryNames == null) {
/*
* We have to build the cache first.
*/
cachedEntryNames = new ArrayList();
final JarInputStream jis = new JarInputStream(archiveURL.openStream());
JarEntry entry;
try {
while ((entry = jis.getNextJarEntry()) != null) {
cachedEntryNames.add(entry.getName());
}
} finally {
jis.close();
}
}
return cachedEntryNames;
}
@Override
public Enumeration entries(final String prefix) {
try {
/*
* This is trickier than the non-prefix case because we have to
* look ahead in the iterator of all the names.
*/
final Iterator it = entryNames().iterator();
return new Enumeration() {
/** preloaded with the first match, if any. */
private String nextName = nextMatch();
@Override
public boolean hasMoreElements() {
return nextName != null;
}
@Override
public String nextElement() {
final String result = nextName;
nextName = nextMatch();
return result;
}
/**
* Returns the next entry name from the entry name cache which
* matches the specified prefix.
*
* @return next matching name if there is one; null otherwise
*/
private String nextMatch() {
String nextMatch = null;
while (it.hasNext() && ( ! (nextMatch = it.next()).startsWith(prefix))) {
}
return nextMatch;
}
};
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public Collection getDirectories() throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean isDirectory(String name) {
JarInputStream jis = null;
try {
jis = new JarInputStream(entryURL(name).openStream());
JarEntry entry = jis.getNextJarEntry();
return entry.isDirectory();
} catch (IOException ex) {
throw new RuntimeException(ex);
} finally {
if (jis != null) {
try {
jis.close();
} catch (IOException ignore) {
}
}
}
}
@Override
public synchronized Manifest getManifest() throws IOException {
if (cachedManifest != null) {
return cachedManifest;
}
final InputStream manifestIS = getEntry(JarFile.MANIFEST_NAME);
if (manifestIS == null) {
return null;
}
return (cachedManifest = new Manifest(manifestIS));
}
@Override
public URI getURI() {
return archiveURI;
}
@Override
public long getArchiveSize() throws SecurityException {
if (cachedArchiveSize != -2) {
return cachedArchiveSize;
}
try {
URLConnection cnx = archiveURL.openConnection();
return (cachedArchiveSize = cnx.getContentLength());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public String getName() {
return archiveURI.getPath();
}
}