com.signalfx.shaded.jetty.util.resource.JarFileResource Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package com.signalfx.shaded.jetty.util.resource;
import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import com.signalfx.shaded.jetty.util.URIUtil;
import com.signalfx.shaded.jetty.util.log.Log;
import com.signalfx.shaded.jetty.util.log.Logger;
public class JarFileResource extends JarResource
{
private static final Logger LOG = Log.getLogger(JarFileResource.class);
private JarFile _jarFile;
private File _file;
private String[] _list;
private JarEntry _entry;
private boolean _directory;
private String _jarUrl;
private String _path;
private boolean _exists;
protected JarFileResource(URL url)
{
super(url);
}
protected JarFileResource(URL url, boolean useCaches)
{
super(url, useCaches);
}
@Override
public synchronized void close()
{
_exists = false;
_list = null;
_entry = null;
_file = null;
//if the jvm is not doing url caching, then the JarFiles will not be cached either,
//and so they are safe to close
if (!getUseCaches())
{
if (_jarFile != null)
{
try
{
if (LOG.isDebugEnabled())
LOG.debug("Closing JarFile " + _jarFile.getName());
_jarFile.close();
}
catch (IOException ioe)
{
LOG.ignore(ioe);
}
}
}
_jarFile = null;
super.close();
}
@Override
protected synchronized boolean checkConnection()
{
try
{
super.checkConnection();
}
finally
{
if (_jarConnection == null)
{
_entry = null;
_file = null;
_jarFile = null;
_list = null;
}
}
return _jarFile != null;
}
@Override
protected synchronized void newConnection()
throws IOException
{
super.newConnection();
_entry = null;
_file = null;
_jarFile = null;
_list = null;
// Work with encoded URL path (_urlString is assumed to be encoded)
int sep = _urlString.lastIndexOf("!/");
_jarUrl = _urlString.substring(0, sep + 2);
_path = URIUtil.decodePath(_urlString.substring(sep + 2));
if (_path.length() == 0)
_path = null;
_jarFile = _jarConnection.getJarFile();
_file = new File(_jarFile.getName());
}
/**
* Returns true if the represented resource exists.
*/
@Override
public boolean exists()
{
if (_exists)
return true;
if (_urlString.endsWith("!/"))
{
String fileUrl = _urlString.substring(4, _urlString.length() - 2);
try
{
return newResource(fileUrl).exists();
}
catch (Exception e)
{
LOG.ignore(e);
return false;
}
}
boolean check = checkConnection();
// Is this a root URL?
if (_jarUrl != null && _path == null)
{
// Then if it exists it is a directory
_directory = check;
return true;
}
else
{
// Can we find a file for it?
boolean closeJarFile = false;
JarFile jarFile = null;
if (check)
// Yes
jarFile = _jarFile;
else
{
// No - so lets look if the root entry exists.
try
{
JarURLConnection c = (JarURLConnection)((new URL(_jarUrl)).openConnection());
c.setUseCaches(getUseCaches());
jarFile = c.getJarFile();
closeJarFile = !getUseCaches();
}
catch (Exception e)
{
LOG.ignore(e);
}
}
// Do we need to look more closely?
if (jarFile != null && _entry == null && !_directory)
{
// OK - we have a JarFile, lets look for the entry
JarEntry entry = jarFile.getJarEntry(_path);
if (entry == null)
{
// the entry does not exist
_exists = false;
}
else if (entry.isDirectory())
{
_directory = true;
_entry = entry;
}
else
{
// Let's confirm is a file
JarEntry directory = jarFile.getJarEntry(_path + '/');
if (directory != null)
{
_directory = true;
_entry = directory;
}
else
{
// OK is a file
_directory = false;
_entry = entry;
}
}
}
if (closeJarFile && jarFile != null)
{
try
{
jarFile.close();
}
catch (IOException ioe)
{
LOG.ignore(ioe);
}
}
}
_exists = (_directory || _entry != null);
return _exists;
}
/**
* Returns true if the represented resource is a container/directory.
* If the resource is not a file, resources ending with "/" are
* considered directories.
*/
@Override
public boolean isDirectory()
{
return _urlString.endsWith("/") || exists() && _directory;
}
/**
* Returns the last modified time
*/
@Override
public long lastModified()
{
if (checkConnection() && _file != null)
{
if (exists() && _entry != null)
return _entry.getTime();
return _file.lastModified();
}
return -1;
}
@Override
public synchronized String[] list()
{
if (isDirectory() && _list == null)
{
List list = null;
try
{
list = listEntries();
}
catch (Exception e)
{
//Sun's JarURLConnection impl for jar: protocol will close a JarFile in its connect() method if
//useCaches == false (eg someone called URLConnection with defaultUseCaches==true).
//As their sun.net.www.protocol.jar package caches JarFiles and/or connections, we can wind up in
//the situation where the JarFile we have remembered in our _jarFile member has actually been closed
//by other code.
//So, do one retry to drop a connection and get a fresh JarFile
LOG.warn("Retrying list:" + e);
LOG.debug(e);
close();
list = listEntries();
}
if (list != null)
{
_list = new String[list.size()];
list.toArray(_list);
}
}
return _list;
}
private List listEntries()
{
checkConnection();
ArrayList list = new ArrayList(32);
JarFile jarFile = _jarFile;
if (jarFile == null)
{
try
{
JarURLConnection jc = (JarURLConnection)((new URL(_jarUrl)).openConnection());
jc.setUseCaches(getUseCaches());
jarFile = jc.getJarFile();
}
catch (Exception e)
{
e.printStackTrace();
LOG.ignore(e);
}
if (jarFile == null)
throw new IllegalStateException();
}
Enumeration e = jarFile.entries();
String encodedDir = _urlString.substring(_urlString.lastIndexOf("!/") + 2);
String dir = URIUtil.decodePath(encodedDir);
while (e.hasMoreElements())
{
JarEntry entry = e.nextElement();
String name = entry.getName();
if (!name.startsWith(dir) || name.length() == dir.length())
{
continue;
}
String listName = name.substring(dir.length());
int dash = listName.indexOf('/');
if (dash >= 0)
{
//when listing jar:file urls, you get back one
//entry for the dir itself, which we ignore
if (dash == 0 && listName.length() == 1)
continue;
//when listing jar:file urls, all files and
//subdirs have a leading /, which we remove
if (dash == 0)
listName = listName.substring(dash + 1);
else
listName = listName.substring(0, dash + 1);
if (list.contains(listName))
continue;
}
list.add(listName);
}
return list;
}
/**
* Return the length of the resource
*/
@Override
public long length()
{
if (isDirectory())
return -1;
if (_entry != null)
return _entry.getSize();
return -1;
}
/**
* Take a Resource that possibly might use URLConnection caching
* and turn it into one that doesn't.
*
* @param resource the JarFileResource to obtain without URLConnection caching.
* @return the non-caching resource
*/
public static Resource getNonCachingResource(Resource resource)
{
if (!(resource instanceof JarFileResource))
return resource;
JarFileResource oldResource = (JarFileResource)resource;
JarFileResource newResource = new JarFileResource(oldResource.getURL(), false);
return newResource;
}
/**
* Check if this jar:file: resource is contained in the
* named resource. Eg jar:file:///a/b/c/foo.jar!/x.html isContainedIn file:///a/b/c/foo.jar
*
* @param resource the resource to test for
* @return true if resource is contained in the named resource
* @throws MalformedURLException if unable to process is contained due to invalid URL format
*/
@Override
public boolean isContainedIn(Resource resource)
throws MalformedURLException
{
String string = _urlString;
int index = string.lastIndexOf("!/");
if (index > 0)
string = string.substring(0, index);
if (string.startsWith("jar:"))
string = string.substring(4);
URL url = new URL(string);
return url.sameFile(resource.getURI().toURL());
}
public File getJarFile()
{
if (_file != null)
return _file;
return null;
}
}