jdk.internal.loader.URLClassPath Maven / Gradle / Ivy
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/*
* Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.internal.loader;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.security.AccessControlContext;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.CodeSigner;
import java.security.Permission;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.cert.Certificate;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.jar.JarFile;
import java.util.zip.CRC32;
import java.util.zip.ZipEntry;
import java.util.jar.JarEntry;
import java.util.jar.Manifest;
import java.util.jar.Attributes;
import java.util.jar.Attributes.Name;
import java.util.zip.ZipFile;
import jdk.internal.access.JavaNetURLAccess;
import jdk.internal.access.JavaUtilZipFileAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.util.jar.InvalidJarIndexError;
import jdk.internal.util.jar.JarIndex;
import sun.net.util.URLUtil;
import sun.net.www.ParseUtil;
import sun.security.action.GetPropertyAction;
/**
* This class is used to maintain a search path of URLs for loading classes
* and resources from both JAR files and directories.
*
* @author David Connelly
*/
public class URLClassPath {
private static final String USER_AGENT_JAVA_VERSION = "UA-Java-Version";
private static final String JAVA_VERSION;
private static final boolean DEBUG;
private static final boolean DISABLE_JAR_CHECKING;
private static final boolean DISABLE_ACC_CHECKING;
private static final boolean DISABLE_CP_URL_CHECK;
private static final boolean DEBUG_CP_URL_CHECK;
static {
Properties props = GetPropertyAction.privilegedGetProperties();
JAVA_VERSION = props.getProperty("java.version");
DEBUG = (props.getProperty("sun.misc.URLClassPath.debug") != null);
String p = props.getProperty("sun.misc.URLClassPath.disableJarChecking");
DISABLE_JAR_CHECKING = p != null ? p.equals("true") || p.isEmpty() : false;
p = props.getProperty("jdk.net.URLClassPath.disableRestrictedPermissions");
DISABLE_ACC_CHECKING = p != null ? p.equals("true") || p.isEmpty() : false;
// This property will be removed in a later release
p = props.getProperty("jdk.net.URLClassPath.disableClassPathURLCheck");
DISABLE_CP_URL_CHECK = p != null ? p.equals("true") || p.isEmpty() : false;
// Print a message for each Class-Path entry that is ignored (assuming
// the check is not disabled).
p = props.getProperty("jdk.net.URLClassPath.showIgnoredClassPathEntries");
DEBUG_CP_URL_CHECK = p != null ? p.equals("true") || p.isEmpty() : false;
}
/* The original search path of URLs. */
private final ArrayList path;
/* The deque of unopened URLs */
private final ArrayDeque unopenedUrls;
/* The resulting search path of Loaders */
private final ArrayList loaders = new ArrayList<>();
/* Map of each URL opened to its corresponding Loader */
private final HashMap lmap = new HashMap<>();
/* The jar protocol handler to use when creating new URLs */
private final URLStreamHandler jarHandler;
/* Whether this URLClassLoader has been closed yet */
private boolean closed = false;
/* The context to be used when loading classes and resources. If non-null
* this is the context that was captured during the creation of the
* URLClassLoader. null implies no additional security restrictions. */
@SuppressWarnings("removal")
private final AccessControlContext acc;
/**
* Creates a new URLClassPath for the given URLs. The URLs will be
* searched in the order specified for classes and resources. A URL
* ending with a '/' is assumed to refer to a directory. Otherwise,
* the URL is assumed to refer to a JAR file.
*
* @param urls the directory and JAR file URLs to search for classes
* and resources
* @param factory the URLStreamHandlerFactory to use when creating new URLs
* @param acc the context to be used when loading classes and resources, may
* be null
*/
public URLClassPath(URL[] urls,
URLStreamHandlerFactory factory,
@SuppressWarnings("removal") AccessControlContext acc) {
ArrayList path = new ArrayList<>(urls.length);
ArrayDeque unopenedUrls = new ArrayDeque<>(urls.length);
for (URL url : urls) {
path.add(url);
unopenedUrls.add(url);
}
this.path = path;
this.unopenedUrls = unopenedUrls;
if (factory != null) {
jarHandler = factory.createURLStreamHandler("jar");
} else {
jarHandler = null;
}
if (DISABLE_ACC_CHECKING)
this.acc = null;
else
this.acc = acc;
}
public URLClassPath(URL[] urls, @SuppressWarnings("removal") AccessControlContext acc) {
this(urls, null, acc);
}
/**
* Constructs a URLClassPath from a class path string.
*
* @param cp the class path string
* @param skipEmptyElements indicates if empty elements are ignored or
* treated as the current working directory
*
* @apiNote Used to create the application class path.
*/
URLClassPath(String cp, boolean skipEmptyElements) {
ArrayList path = new ArrayList<>();
if (cp != null) {
// map each element of class path to a file URL
int off = 0, next;
do {
next = cp.indexOf(File.pathSeparator, off);
String element = (next == -1)
? cp.substring(off)
: cp.substring(off, next);
if (!element.isEmpty() || !skipEmptyElements) {
URL url = toFileURL(element);
if (url != null) path.add(url);
}
off = next + 1;
} while (next != -1);
}
// can't use ArrayDeque#addAll or new ArrayDeque(Collection);
// it's too early in the bootstrap to trigger use of lambdas
int size = path.size();
ArrayDeque unopenedUrls = new ArrayDeque<>(size);
for (int i = 0; i < size; i++)
unopenedUrls.add(path.get(i));
this.unopenedUrls = unopenedUrls;
this.path = path;
this.jarHandler = null;
this.acc = null;
}
public synchronized List closeLoaders() {
if (closed) {
return Collections.emptyList();
}
List result = new LinkedList<>();
for (Loader loader : loaders) {
try {
loader.close();
} catch (IOException e) {
result.add(e);
}
}
closed = true;
return result;
}
/**
* Appends the specified URL to the search path of directory and JAR
* file URLs from which to load classes and resources.
*
* If the URL specified is null or is already in the list of
* URLs, then invoking this method has no effect.
*/
public synchronized void addURL(URL url) {
if (closed || url == null)
return;
synchronized (unopenedUrls) {
if (! path.contains(url)) {
unopenedUrls.addLast(url);
path.add(url);
}
}
}
/**
* Appends the specified file path as a file URL to the search path.
*/
public void addFile(String s) {
URL url = toFileURL(s);
if (url != null) {
addURL(url);
}
}
/**
* Returns a file URL for the given file path.
*/
private static URL toFileURL(String s) {
try {
File f = new File(s).getCanonicalFile();
return ParseUtil.fileToEncodedURL(f);
} catch (IOException e) {
return null;
}
}
/**
* Returns the original search path of URLs.
*/
public URL[] getURLs() {
synchronized (unopenedUrls) {
return path.toArray(new URL[0]);
}
}
/**
* Finds the resource with the specified name on the URL search path
* or null if not found or security check fails.
*
* @param name the name of the resource
* @param check whether to perform a security check
* @return a {@code URL} for the resource, or {@code null}
* if the resource could not be found.
*/
public URL findResource(String name, boolean check) {
Loader loader;
for (int i = 0; (loader = getLoader(i)) != null; i++) {
URL url = loader.findResource(name, check);
if (url != null) {
return url;
}
}
return null;
}
/**
* Finds the first Resource on the URL search path which has the specified
* name. Returns null if no Resource could be found.
*
* @param name the name of the Resource
* @param check whether to perform a security check
* @return the Resource, or null if not found
*/
public Resource getResource(String name, boolean check) {
if (DEBUG) {
System.err.println("URLClassPath.getResource(\"" + name + "\")");
}
Loader loader;
for (int i = 0; (loader = getLoader(i)) != null; i++) {
Resource res = loader.getResource(name, check);
if (res != null) {
return res;
}
}
return null;
}
/**
* Finds all resources on the URL search path with the given name.
* Returns an enumeration of the URL objects.
*
* @param name the resource name
* @return an Enumeration of all the urls having the specified name
*/
public Enumeration findResources(final String name,
final boolean check) {
return new Enumeration<>() {
private int index = 0;
private URL url = null;
private boolean next() {
if (url != null) {
return true;
} else {
Loader loader;
while ((loader = getLoader(index++)) != null) {
url = loader.findResource(name, check);
if (url != null) {
return true;
}
}
return false;
}
}
public boolean hasMoreElements() {
return next();
}
public URL nextElement() {
if (!next()) {
throw new NoSuchElementException();
}
URL u = url;
url = null;
return u;
}
};
}
public Resource getResource(String name) {
return getResource(name, true);
}
/**
* Finds all resources on the URL search path with the given name.
* Returns an enumeration of the Resource objects.
*
* @param name the resource name
* @return an Enumeration of all the resources having the specified name
*/
public Enumeration getResources(final String name,
final boolean check) {
return new Enumeration<>() {
private int index = 0;
private Resource res = null;
private boolean next() {
if (res != null) {
return true;
} else {
Loader loader;
while ((loader = getLoader(index++)) != null) {
res = loader.getResource(name, check);
if (res != null) {
return true;
}
}
return false;
}
}
public boolean hasMoreElements() {
return next();
}
public Resource nextElement() {
if (!next()) {
throw new NoSuchElementException();
}
Resource r = res;
res = null;
return r;
}
};
}
public Enumeration getResources(final String name) {
return getResources(name, true);
}
/*
* Returns the Loader at the specified position in the URL search
* path. The URLs are opened and expanded as needed. Returns null
* if the specified index is out of range.
*/
private synchronized Loader getLoader(int index) {
if (closed) {
return null;
}
// Expand URL search path until the request can be satisfied
// or unopenedUrls is exhausted.
while (loaders.size() < index + 1) {
final URL url;
synchronized (unopenedUrls) {
url = unopenedUrls.pollFirst();
if (url == null)
return null;
}
// Skip this URL if it already has a Loader. (Loader
// may be null in the case where URL has not been opened
// but is referenced by a JAR index.)
String urlNoFragString = URLUtil.urlNoFragString(url);
if (lmap.containsKey(urlNoFragString)) {
continue;
}
// Otherwise, create a new Loader for the URL.
Loader loader;
try {
loader = getLoader(url);
// If the loader defines a local class path then add the
// URLs as the next URLs to be opened.
URL[] urls = loader.getClassPath();
if (urls != null) {
push(urls);
}
} catch (IOException e) {
// Silently ignore for now...
continue;
} catch (SecurityException se) {
// Always silently ignore. The context, if there is one, that
// this URLClassPath was given during construction will never
// have permission to access the URL.
if (DEBUG) {
System.err.println("Failed to access " + url + ", " + se );
}
continue;
}
// Finally, add the Loader to the search path.
loaders.add(loader);
lmap.put(urlNoFragString, loader);
}
return loaders.get(index);
}
/*
* Returns the Loader for the specified base URL.
*/
@SuppressWarnings("removal")
private Loader getLoader(final URL url) throws IOException {
try {
return AccessController.doPrivileged(
new PrivilegedExceptionAction<>() {
public Loader run() throws IOException {
String protocol = url.getProtocol(); // lower cased in URL
String file = url.getFile();
if (file != null && file.endsWith("/")) {
if ("file".equals(protocol)) {
return new FileLoader(url);
} else if ("jar".equals(protocol) &&
isDefaultJarHandler(url) &&
file.endsWith("!/")) {
// extract the nested URL
URL nestedUrl = new URL(file.substring(0, file.length() - 2));
return new JarLoader(nestedUrl, jarHandler, lmap, acc);
} else {
return new Loader(url);
}
} else {
return new JarLoader(url, jarHandler, lmap, acc);
}
}
}, acc);
} catch (PrivilegedActionException pae) {
throw (IOException)pae.getException();
}
}
private static final JavaNetURLAccess JNUA
= SharedSecrets.getJavaNetURLAccess();
private static boolean isDefaultJarHandler(URL u) {
URLStreamHandler h = JNUA.getHandler(u);
return h instanceof sun.net.www.protocol.jar.Handler;
}
/*
* Pushes the specified URLs onto the head of unopened URLs.
*/
private void push(URL[] urls) {
synchronized (unopenedUrls) {
for (int i = urls.length - 1; i >= 0; --i) {
unopenedUrls.addFirst(urls[i]);
}
}
}
/*
* Checks whether the resource URL should be returned.
* Returns null on security check failure.
* Called by java.net.URLClassLoader.
*/
public static URL checkURL(URL url) {
if (url != null) {
try {
check(url);
} catch (Exception e) {
return null;
}
}
return url;
}
/*
* Checks whether the resource URL should be returned.
* Throws exception on failure.
* Called internally within this file.
*/
public static void check(URL url) throws IOException {
@SuppressWarnings("removal")
SecurityManager security = System.getSecurityManager();
if (security != null) {
URLConnection urlConnection = url.openConnection();
Permission perm = urlConnection.getPermission();
if (perm != null) {
try {
security.checkPermission(perm);
} catch (SecurityException se) {
// fallback to checkRead/checkConnect for pre 1.2
// security managers
if ((perm instanceof java.io.FilePermission) &&
perm.getActions().indexOf("read") != -1) {
security.checkRead(perm.getName());
} else if ((perm instanceof
java.net.SocketPermission) &&
perm.getActions().indexOf("connect") != -1) {
URL locUrl = url;
if (urlConnection instanceof JarURLConnection) {
locUrl = ((JarURLConnection)urlConnection).getJarFileURL();
}
security.checkConnect(locUrl.getHost(),
locUrl.getPort());
} else {
throw se;
}
}
}
}
}
/**
* Nested class used to represent a loader of resources and classes
* from a base URL.
*/
private static class Loader implements Closeable {
private final URL base;
private JarFile jarfile; // if this points to a jar file
/*
* Creates a new Loader for the specified URL.
*/
Loader(URL url) {
base = url;
}
/*
* Returns the base URL for this Loader.
*/
URL getBaseURL() {
return base;
}
URL findResource(final String name, boolean check) {
URL url;
try {
url = new URL(base, ParseUtil.encodePath(name, false));
} catch (MalformedURLException e) {
return null;
}
try {
if (check) {
URLClassPath.check(url);
}
/*
* For a HTTP connection we use the HEAD method to
* check if the resource exists.
*/
URLConnection uc = url.openConnection();
if (uc instanceof HttpURLConnection) {
HttpURLConnection hconn = (HttpURLConnection)uc;
hconn.setRequestMethod("HEAD");
if (hconn.getResponseCode() >= HttpURLConnection.HTTP_BAD_REQUEST) {
return null;
}
} else {
// our best guess for the other cases
uc.setUseCaches(false);
InputStream is = uc.getInputStream();
is.close();
}
return url;
} catch (Exception e) {
return null;
}
}
Resource getResource(final String name, boolean check) {
final URL url;
try {
url = new URL(base, ParseUtil.encodePath(name, false));
} catch (MalformedURLException e) {
return null;
}
final URLConnection uc;
try {
if (check) {
URLClassPath.check(url);
}
uc = url.openConnection();
if (uc instanceof JarURLConnection) {
/* Need to remember the jar file so it can be closed
* in a hurry.
*/
JarURLConnection juc = (JarURLConnection)uc;
jarfile = JarLoader.checkJar(juc.getJarFile());
}
InputStream in = uc.getInputStream();
} catch (Exception e) {
return null;
}
return new Resource() {
public String getName() { return name; }
public URL getURL() { return url; }
public URL getCodeSourceURL() { return base; }
public InputStream getInputStream() throws IOException {
return uc.getInputStream();
}
public int getContentLength() throws IOException {
return uc.getContentLength();
}
};
}
/*
* Returns the Resource for the specified name, or null if not
* found or the caller does not have the permission to get the
* resource.
*/
Resource getResource(final String name) {
return getResource(name, true);
}
/*
* Closes this loader and release all resources.
* Method overridden in sub-classes.
*/
@Override
public void close() throws IOException {
if (jarfile != null) {
jarfile.close();
}
}
/*
* Returns the local class path for this loader, or null if none.
*/
URL[] getClassPath() throws IOException {
return null;
}
}
/*
* Nested class used to represent a Loader of resources from a JAR URL.
*/
private static class JarLoader extends Loader {
private JarFile jar;
private final URL csu;
private JarIndex index;
private URLStreamHandler handler;
private final HashMap lmap;
@SuppressWarnings("removal")
private final AccessControlContext acc;
private boolean closed = false;
private static final JavaUtilZipFileAccess zipAccess =
SharedSecrets.getJavaUtilZipFileAccess();
/*
* Creates a new JarLoader for the specified URL referring to
* a JAR file.
*/
private JarLoader(URL url, URLStreamHandler jarHandler,
HashMap loaderMap,
@SuppressWarnings("removal") AccessControlContext acc)
throws IOException
{
super(new URL("jar", "", -1, url + "!/", jarHandler));
csu = url;
handler = jarHandler;
lmap = loaderMap;
this.acc = acc;
ensureOpen();
}
@Override
public void close () throws IOException {
// closing is synchronized at higher level
if (!closed) {
closed = true;
// in case not already open.
ensureOpen();
jar.close();
}
}
JarFile getJarFile () {
return jar;
}
private boolean isOptimizable(URL url) {
return "file".equals(url.getProtocol());
}
@SuppressWarnings("removal")
private void ensureOpen() throws IOException {
if (jar == null) {
try {
AccessController.doPrivileged(
new PrivilegedExceptionAction<>() {
public Void run() throws IOException {
if (DEBUG) {
System.err.println("Opening " + csu);
Thread.dumpStack();
}
jar = getJarFile(csu);
index = JarIndex.getJarIndex(jar);
if (index != null) {
String[] jarfiles = index.getJarFiles();
// Add all the dependent URLs to the lmap so that loaders
// will not be created for them by URLClassPath.getLoader(int)
// if the same URL occurs later on the main class path. We set
// Loader to null here to avoid creating a Loader for each
// URL until we actually need to try to load something from them.
for (int i = 0; i < jarfiles.length; i++) {
try {
URL jarURL = new URL(csu, jarfiles[i]);
// If a non-null loader already exists, leave it alone.
String urlNoFragString = URLUtil.urlNoFragString(jarURL);
if (!lmap.containsKey(urlNoFragString)) {
lmap.put(urlNoFragString, null);
}
} catch (MalformedURLException e) {
continue;
}
}
}
return null;
}
}, acc);
} catch (PrivilegedActionException pae) {
throw (IOException)pae.getException();
}
}
}
/* Throws if the given jar file is does not start with the correct LOC */
@SuppressWarnings("removal")
static JarFile checkJar(JarFile jar) throws IOException {
if (System.getSecurityManager() != null && !DISABLE_JAR_CHECKING
&& !zipAccess.startsWithLocHeader(jar)) {
IOException x = new IOException("Invalid Jar file");
try {
jar.close();
} catch (IOException ex) {
x.addSuppressed(ex);
}
throw x;
}
return jar;
}
private JarFile getJarFile(URL url) throws IOException {
// Optimize case where url refers to a local jar file
if (isOptimizable(url)) {
FileURLMapper p = new FileURLMapper(url);
if (!p.exists()) {
throw new FileNotFoundException(p.getPath());
}
return checkJar(new JarFile(new File(p.getPath()), true, ZipFile.OPEN_READ,
JarFile.runtimeVersion()));
}
URLConnection uc = (new URL(getBaseURL(), "#runtime")).openConnection();
uc.setRequestProperty(USER_AGENT_JAVA_VERSION, JAVA_VERSION);
JarFile jarFile = ((JarURLConnection)uc).getJarFile();
return checkJar(jarFile);
}
/*
* Returns the index of this JarLoader if it exists.
*/
JarIndex getIndex() {
try {
ensureOpen();
} catch (IOException e) {
throw new InternalError(e);
}
return index;
}
/*
* Creates the resource and if the check flag is set to true, checks if
* is its okay to return the resource.
*/
Resource checkResource(final String name, boolean check,
final JarEntry entry) {
final URL url;
try {
String nm;
if (jar.isMultiRelease()) {
nm = entry.getRealName();
} else {
nm = name;
}
url = new URL(getBaseURL(), ParseUtil.encodePath(nm, false));
if (check) {
URLClassPath.check(url);
}
} catch (MalformedURLException e) {
return null;
// throw new IllegalArgumentException("name");
} catch (IOException e) {
return null;
} catch (@SuppressWarnings("removal") AccessControlException e) {
return null;
}
return new Resource() {
private Exception dataError = null;
public String getName() { return name; }
public URL getURL() { return url; }
public URL getCodeSourceURL() { return csu; }
public InputStream getInputStream() throws IOException
{ return jar.getInputStream(entry); }
public int getContentLength()
{ return (int)entry.getSize(); }
public Manifest getManifest() throws IOException {
SharedSecrets.javaUtilJarAccess().ensureInitialization(jar);
return jar.getManifest();
}
public Certificate[] getCertificates()
{ return entry.getCertificates(); };
public CodeSigner[] getCodeSigners()
{ return entry.getCodeSigners(); };
public Exception getDataError()
{ return dataError; }
public byte[] getBytes() throws IOException {
byte[] bytes = super.getBytes();
CRC32 crc32 = new CRC32();
crc32.update(bytes);
if (crc32.getValue() != entry.getCrc()) {
dataError = new IOException(
"CRC error while extracting entry from JAR file");
}
return bytes;
}
};
}
/*
* Returns true iff at least one resource in the jar file has the same
* package name as that of the specified resource name.
*/
boolean validIndex(final String name) {
String packageName = name;
int pos;
if ((pos = name.lastIndexOf('/')) != -1) {
packageName = name.substring(0, pos);
}
String entryName;
ZipEntry entry;
Enumeration enum_ = jar.entries();
while (enum_.hasMoreElements()) {
entry = enum_.nextElement();
entryName = entry.getName();
if ((pos = entryName.lastIndexOf('/')) != -1)
entryName = entryName.substring(0, pos);
if (entryName.equals(packageName)) {
return true;
}
}
return false;
}
/*
* Returns the URL for a resource with the specified name
*/
@Override
URL findResource(final String name, boolean check) {
Resource rsc = getResource(name, check);
if (rsc != null) {
return rsc.getURL();
}
return null;
}
/*
* Returns the JAR Resource for the specified name.
*/
@Override
Resource getResource(final String name, boolean check) {
try {
ensureOpen();
} catch (IOException e) {
throw new InternalError(e);
}
final JarEntry entry = jar.getJarEntry(name);
if (entry != null)
return checkResource(name, check, entry);
if (index == null)
return null;
HashSet visited = new HashSet<>();
return getResource(name, check, visited);
}
/*
* Version of getResource() that tracks the jar files that have been
* visited by linking through the index files. This helper method uses
* a HashSet to store the URLs of jar files that have been searched and
* uses it to avoid going into an infinite loop, looking for a
* non-existent resource.
*/
@SuppressWarnings("removal")
Resource getResource(final String name, boolean check,
Set visited) {
Resource res;
String[] jarFiles;
int count = 0;
LinkedList jarFilesList = null;
/* If there no jar files in the index that can potential contain
* this resource then return immediately.
*/
if ((jarFilesList = index.get(name)) == null)
return null;
do {
int size = jarFilesList.size();
jarFiles = jarFilesList.toArray(new String[size]);
/* loop through the mapped jar file list */
while (count < size) {
String jarName = jarFiles[count++];
JarLoader newLoader;
final URL url;
try{
url = new URL(csu, jarName);
String urlNoFragString = URLUtil.urlNoFragString(url);
if ((newLoader = (JarLoader)lmap.get(urlNoFragString)) == null) {
/* no loader has been set up for this jar file
* before
*/
newLoader = AccessController.doPrivileged(
new PrivilegedExceptionAction<>() {
public JarLoader run() throws IOException {
return new JarLoader(url, handler,
lmap, acc);
}
}, acc);
/* this newly opened jar file has its own index,
* merge it into the parent's index, taking into
* account the relative path.
*/
JarIndex newIndex = newLoader.getIndex();
if (newIndex != null) {
int pos = jarName.lastIndexOf('/');
newIndex.merge(this.index, (pos == -1 ?
null : jarName.substring(0, pos + 1)));
}
/* put it in the global hashtable */
lmap.put(urlNoFragString, newLoader);
}
} catch (PrivilegedActionException pae) {
continue;
} catch (MalformedURLException e) {
continue;
}
/* Note that the addition of the url to the list of visited
* jars incorporates a check for presence in the hashmap
*/
boolean visitedURL = !visited.add(URLUtil.urlNoFragString(url));
if (!visitedURL) {
try {
newLoader.ensureOpen();
} catch (IOException e) {
throw new InternalError(e);
}
final JarEntry entry = newLoader.jar.getJarEntry(name);
if (entry != null) {
return newLoader.checkResource(name, check, entry);
}
/* Verify that at least one other resource with the
* same package name as the lookedup resource is
* present in the new jar
*/
if (!newLoader.validIndex(name)) {
/* the mapping is wrong */
throw new InvalidJarIndexError("Invalid index");
}
}
/* If newLoader is the current loader or if it is a
* loader that has already been searched or if the new
* loader does not have an index then skip it
* and move on to the next loader.
*/
if (visitedURL || newLoader == this ||
newLoader.getIndex() == null) {
continue;
}
/* Process the index of the new loader
*/
if ((res = newLoader.getResource(name, check, visited))
!= null) {
return res;
}
}
// Get the list of jar files again as the list could have grown
// due to merging of index files.
jarFilesList = index.get(name);
// If the count is unchanged, we are done.
} while (count < jarFilesList.size());
return null;
}
/*
* Returns the JAR file local class path, or null if none.
*/
@Override
URL[] getClassPath() throws IOException {
if (index != null) {
return null;
}
ensureOpen();
// Only get manifest when necessary
if (SharedSecrets.javaUtilJarAccess().jarFileHasClassPathAttribute(jar)) {
Manifest man = jar.getManifest();
if (man != null) {
Attributes attr = man.getMainAttributes();
if (attr != null) {
String value = attr.getValue(Name.CLASS_PATH);
if (value != null) {
return parseClassPath(csu, value);
}
}
}
}
return null;
}
/*
* Parses value of the Class-Path manifest attribute and returns
* an array of URLs relative to the specified base URL.
*/
private static URL[] parseClassPath(URL base, String value)
throws MalformedURLException
{
StringTokenizer st = new StringTokenizer(value);
URL[] urls = new URL[st.countTokens()];
int i = 0;
while (st.hasMoreTokens()) {
String path = st.nextToken();
URL url = DISABLE_CP_URL_CHECK ? new URL(base, path) : tryResolve(base, path);
if (url != null) {
urls[i] = url;
i++;
} else {
if (DEBUG_CP_URL_CHECK) {
System.err.println("Class-Path entry: \"" + path
+ "\" ignored in JAR file " + base);
}
}
}
if (i == 0) {
urls = null;
} else if (i != urls.length) {
// Truncate nulls from end of array
urls = Arrays.copyOf(urls, i);
}
return urls;
}
static URL tryResolve(URL base, String input) throws MalformedURLException {
if ("file".equalsIgnoreCase(base.getProtocol())) {
return tryResolveFile(base, input);
} else {
return tryResolveNonFile(base, input);
}
}
/**
* Attempt to return a file URL by resolving input against a base file
* URL.
* @return the resolved URL or null if the input is an absolute URL with
* a scheme other than file (ignoring case)
* @throws MalformedURLException
*/
static URL tryResolveFile(URL base, String input) throws MalformedURLException {
URL retVal = new URL(base, input);
if (input.indexOf(':') >= 0 &&
!"file".equalsIgnoreCase(retVal.getProtocol())) {
// 'input' contains a ':', which might be a scheme, or might be
// a Windows drive letter. If the protocol for the resolved URL
// isn't "file:", it should be ignored.
return null;
}
return retVal;
}
/**
* Attempt to return a URL by resolving input against a base URL. Returns
* null if the resolved URL is not contained by the base URL.
*
* @return the resolved URL or null
* @throws MalformedURLException
*/
static URL tryResolveNonFile(URL base, String input) throws MalformedURLException {
String child = input.replace(File.separatorChar, '/');
if (isRelative(child)) {
URL url = new URL(base, child);
String bp = base.getPath();
String urlp = url.getPath();
int pos = bp.lastIndexOf('/');
if (pos == -1) {
pos = bp.length() - 1;
}
if (urlp.regionMatches(0, bp, 0, pos + 1)
&& urlp.indexOf("..", pos) == -1) {
return url;
}
}
return null;
}
/**
* Returns true if the given input is a relative URI.
*/
static boolean isRelative(String child) {
try {
return !URI.create(child).isAbsolute();
} catch (IllegalArgumentException e) {
return false;
}
}
}
/*
* Nested class used to represent a loader of classes and resources
* from a file URL that refers to a directory.
*/
private static class FileLoader extends Loader {
/* Canonicalized File */
private File dir;
/*
* Creates a new FileLoader for the specified URL with a file protocol.
*/
private FileLoader(URL url) throws IOException {
super(url);
String path = url.getFile().replace('/', File.separatorChar);
path = ParseUtil.decode(path);
dir = (new File(path)).getCanonicalFile();
}
/*
* Returns the URL for a resource with the specified name
*/
@Override
URL findResource(final String name, boolean check) {
Resource rsc = getResource(name, check);
if (rsc != null) {
return rsc.getURL();
}
return null;
}
@Override
Resource getResource(final String name, boolean check) {
final URL url;
try {
URL normalizedBase = new URL(getBaseURL(), ".");
url = new URL(getBaseURL(), ParseUtil.encodePath(name, false));
if (url.getFile().startsWith(normalizedBase.getFile()) == false) {
// requested resource had ../..'s in path
return null;
}
if (check)
URLClassPath.check(url);
final File file;
if (name.indexOf("..") != -1) {
file = (new File(dir, name.replace('/', File.separatorChar)))
.getCanonicalFile();
if ( !((file.getPath()).startsWith(dir.getPath())) ) {
/* outside of base dir */
return null;
}
} else {
file = new File(dir, name.replace('/', File.separatorChar));
}
if (file.exists()) {
return new Resource() {
public String getName() { return name; };
public URL getURL() { return url; };
public URL getCodeSourceURL() { return getBaseURL(); };
public InputStream getInputStream() throws IOException
{ return new FileInputStream(file); };
public int getContentLength() throws IOException
{ return (int)file.length(); };
};
}
} catch (Exception e) {
return null;
}
return null;
}
}
}