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The JarFile.java Java example source code
/*
* Copyright (c) 1997, 2013, 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 java.util.jar;
import java.io.*;
import java.lang.ref.SoftReference;
import java.net.URL;
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import java.util.zip.*;
import java.security.CodeSigner;
import java.security.cert.Certificate;
import java.security.AccessController;
import java.security.CodeSource;
import sun.misc.IOUtils;
import sun.security.action.GetPropertyAction;
import sun.security.util.ManifestEntryVerifier;
import sun.misc.SharedSecrets;
import sun.security.util.SignatureFileVerifier;
/**
* The <code>JarFile class is used to read the contents of a jar file
* from any file that can be opened with <code>java.io.RandomAccessFile.
* It extends the class <code>java.util.zip.ZipFile with support
* for reading an optional <code>Manifest entry. The
* <code>Manifest can be used to specify meta-information about the
* jar file and its entries.
*
* <p> Unless otherwise noted, passing a null argument to a constructor
* or method in this class will cause a {@link NullPointerException} to be
* thrown.
*
* If the verify flag is on when opening a signed jar file, the content of the
* file is verified against its signature embedded inside the file. Please note
* that the verification process does not include validating the signer's
* certificate. A caller should inspect the return value of
* {@link JarEntry#getCodeSigners()} to further determine if the signature
* can be trusted.
*
* @author David Connelly
* @see Manifest
* @see java.util.zip.ZipFile
* @see java.util.jar.JarEntry
* @since 1.2
*/
public
class JarFile extends ZipFile {
private SoftReference<Manifest> manRef;
private JarEntry manEntry;
private JarVerifier jv;
private boolean jvInitialized;
private boolean verify;
// indicates if Class-Path attribute present (only valid if hasCheckedSpecialAttributes true)
private boolean hasClassPathAttribute;
// true if manifest checked for special attributes
private volatile boolean hasCheckedSpecialAttributes;
// Set up JavaUtilJarAccess in SharedSecrets
static {
SharedSecrets.setJavaUtilJarAccess(new JavaUtilJarAccessImpl());
}
/**
* The JAR manifest file name.
*/
public static final String MANIFEST_NAME = "META-INF/MANIFEST.MF";
/**
* Creates a new <code>JarFile to read from the specified
* file <code>name. The JarFile will be verified if
* it is signed.
* @param name the name of the jar file to be opened for reading
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(String name) throws IOException {
this(new File(name), true, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile to read from the specified
* file <code>name.
* @param name the name of the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(String name, boolean verify) throws IOException {
this(new File(name), verify, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile to read from the specified
* <code>File object. The JarFile will be verified if
* it is signed.
* @param file the jar file to be opened for reading
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(File file) throws IOException {
this(file, true, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile to read from the specified
* <code>File object.
* @param file the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager.
*/
public JarFile(File file, boolean verify) throws IOException {
this(file, verify, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile to read from the specified
* <code>File object in the specified mode. The mode argument
* must be either <tt>OPEN_READ or OPEN_READ | OPEN_DELETE.
*
* @param file the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @param mode the mode in which the file is to be opened
* @throws IOException if an I/O error has occurred
* @throws IllegalArgumentException
* if the <tt>mode argument is invalid
* @throws SecurityException if access to the file is denied
* by the SecurityManager
* @since 1.3
*/
public JarFile(File file, boolean verify, int mode) throws IOException {
super(file, mode);
this.verify = verify;
}
/**
* Returns the jar file manifest, or <code>null if none.
*
* @return the jar file manifest, or <code>null if none
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
* @throws IOException if an I/O error has occurred
*/
public Manifest getManifest() throws IOException {
return getManifestFromReference();
}
private Manifest getManifestFromReference() throws IOException {
Manifest man = manRef != null ? manRef.get() : null;
if (man == null) {
JarEntry manEntry = getManEntry();
// If found then load the manifest
if (manEntry != null) {
if (verify) {
byte[] b = getBytes(manEntry);
man = new Manifest(new ByteArrayInputStream(b));
if (!jvInitialized) {
jv = new JarVerifier(b);
}
} else {
man = new Manifest(super.getInputStream(manEntry));
}
manRef = new SoftReference<>(man);
}
}
return man;
}
private native String[] getMetaInfEntryNames();
/**
* Returns the <code>JarEntry for the given entry name or
* <code>null if not found.
*
* @param name the jar file entry name
* @return the <code>JarEntry for the given entry name or
* <code>null if not found.
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*
* @see java.util.jar.JarEntry
*/
public JarEntry getJarEntry(String name) {
return (JarEntry)getEntry(name);
}
/**
* Returns the <code>ZipEntry for the given entry name or
* <code>null if not found.
*
* @param name the jar file entry name
* @return the <code>ZipEntry for the given entry name or
* <code>null if not found
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*
* @see java.util.zip.ZipEntry
*/
public ZipEntry getEntry(String name) {
ZipEntry ze = super.getEntry(name);
if (ze != null) {
return new JarFileEntry(ze);
}
return null;
}
private class JarEntryIterator implements Enumeration<JarEntry>,
Iterator<JarEntry>
{
final Enumeration<? extends ZipEntry> e = JarFile.super.entries();
public boolean hasNext() {
return e.hasMoreElements();
}
public JarEntry next() {
ZipEntry ze = e.nextElement();
return new JarFileEntry(ze);
}
public boolean hasMoreElements() {
return hasNext();
}
public JarEntry nextElement() {
return next();
}
}
/**
* Returns an enumeration of the zip file entries.
*/
public Enumeration<JarEntry> entries() {
return new JarEntryIterator();
}
@Override
public Stream<JarEntry> stream() {
return StreamSupport.stream(Spliterators.spliterator(
new JarEntryIterator(), size(),
Spliterator.ORDERED | Spliterator.DISTINCT |
Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
}
private class JarFileEntry extends JarEntry {
JarFileEntry(ZipEntry ze) {
super(ze);
}
public Attributes getAttributes() throws IOException {
Manifest man = JarFile.this.getManifest();
if (man != null) {
return man.getAttributes(getName());
} else {
return null;
}
}
public Certificate[] getCertificates() {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (certs == null && jv != null) {
certs = jv.getCerts(JarFile.this, this);
}
return certs == null ? null : certs.clone();
}
public CodeSigner[] getCodeSigners() {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (signers == null && jv != null) {
signers = jv.getCodeSigners(JarFile.this, this);
}
return signers == null ? null : signers.clone();
}
}
/*
* Ensures that the JarVerifier has been created if one is
* necessary (i.e., the jar appears to be signed.) This is done as
* a quick check to avoid processing of the manifest for unsigned
* jars.
*/
private void maybeInstantiateVerifier() throws IOException {
if (jv != null) {
return;
}
if (verify) {
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
String name = names[i].toUpperCase(Locale.ENGLISH);
if (name.endsWith(".DSA") ||
name.endsWith(".RSA") ||
name.endsWith(".EC") ||
name.endsWith(".SF")) {
// Assume since we found a signature-related file
// that the jar is signed and that we therefore
// need a JarVerifier and Manifest
getManifest();
return;
}
}
}
// No signature-related files; don't instantiate a
// verifier
verify = false;
}
}
/*
* Initializes the verifier object by reading all the manifest
* entries and passing them to the verifier.
*/
private void initializeVerifier() {
ManifestEntryVerifier mev = null;
// Verify "META-INF/" entries...
try {
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
String uname = names[i].toUpperCase(Locale.ENGLISH);
if (MANIFEST_NAME.equals(uname)
|| SignatureFileVerifier.isBlockOrSF(uname)) {
JarEntry e = getJarEntry(names[i]);
if (e == null) {
throw new JarException("corrupted jar file");
}
if (mev == null) {
mev = new ManifestEntryVerifier
(getManifestFromReference());
}
byte[] b = getBytes(e);
if (b != null && b.length > 0) {
jv.beginEntry(e, mev);
jv.update(b.length, b, 0, b.length, mev);
jv.update(-1, null, 0, 0, mev);
}
}
}
}
} catch (IOException ex) {
// if we had an error parsing any blocks, just
// treat the jar file as being unsigned
jv = null;
verify = false;
if (JarVerifier.debug != null) {
JarVerifier.debug.println("jarfile parsing error!");
ex.printStackTrace();
}
}
// if after initializing the verifier we have nothing
// signed, we null it out.
if (jv != null) {
jv.doneWithMeta();
if (JarVerifier.debug != null) {
JarVerifier.debug.println("done with meta!");
}
if (jv.nothingToVerify()) {
if (JarVerifier.debug != null) {
JarVerifier.debug.println("nothing to verify!");
}
jv = null;
verify = false;
}
}
}
/*
* Reads all the bytes for a given entry. Used to process the
* META-INF files.
*/
private byte[] getBytes(ZipEntry ze) throws IOException {
try (InputStream is = super.getInputStream(ze)) {
return IOUtils.readFully(is, (int)ze.getSize(), true);
}
}
/**
* Returns an input stream for reading the contents of the specified
* zip file entry.
* @param ze the zip file entry
* @return an input stream for reading the contents of the specified
* zip file entry
* @throws ZipException if a zip file format error has occurred
* @throws IOException if an I/O error has occurred
* @throws SecurityException if any of the jar file entries
* are incorrectly signed.
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*/
public synchronized InputStream getInputStream(ZipEntry ze)
throws IOException
{
maybeInstantiateVerifier();
if (jv == null) {
return super.getInputStream(ze);
}
if (!jvInitialized) {
initializeVerifier();
jvInitialized = true;
// could be set to null after a call to
// initializeVerifier if we have nothing to
// verify
if (jv == null)
return super.getInputStream(ze);
}
// wrap a verifier stream around the real stream
return new JarVerifier.VerifierStream(
getManifestFromReference(),
ze instanceof JarFileEntry ?
(JarEntry) ze : getJarEntry(ze.getName()),
super.getInputStream(ze),
jv);
}
// Statics for hand-coded Boyer-Moore search
private static final char[] CLASSPATH_CHARS = {'c','l','a','s','s','-','p','a','t','h'};
// The bad character shift for "class-path"
private static final int[] CLASSPATH_LASTOCC;
// The good suffix shift for "class-path"
private static final int[] CLASSPATH_OPTOSFT;
static {
CLASSPATH_LASTOCC = new int[128];
CLASSPATH_OPTOSFT = new int[10];
CLASSPATH_LASTOCC[(int)'c'] = 1;
CLASSPATH_LASTOCC[(int)'l'] = 2;
CLASSPATH_LASTOCC[(int)'s'] = 5;
CLASSPATH_LASTOCC[(int)'-'] = 6;
CLASSPATH_LASTOCC[(int)'p'] = 7;
CLASSPATH_LASTOCC[(int)'a'] = 8;
CLASSPATH_LASTOCC[(int)'t'] = 9;
CLASSPATH_LASTOCC[(int)'h'] = 10;
for (int i=0; i<9; i++)
CLASSPATH_OPTOSFT[i] = 10;
CLASSPATH_OPTOSFT[9]=1;
}
private JarEntry getManEntry() {
if (manEntry == null) {
// First look up manifest entry using standard name
manEntry = getJarEntry(MANIFEST_NAME);
if (manEntry == null) {
// If not found, then iterate through all the "META-INF/"
// entries to find a match.
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
if (MANIFEST_NAME.equals(
names[i].toUpperCase(Locale.ENGLISH))) {
manEntry = getJarEntry(names[i]);
break;
}
}
}
}
}
return manEntry;
}
/**
* Returns {@code true} iff this JAR file has a manifest with the
* Class-Path attribute
*/
boolean hasClassPathAttribute() throws IOException {
checkForSpecialAttributes();
return hasClassPathAttribute;
}
/**
* Returns true if the pattern {@code src} is found in {@code b}.
* The {@code lastOcc} and {@code optoSft} arrays are the precomputed
* bad character and good suffix shifts.
*/
private boolean match(char[] src, byte[] b, int[] lastOcc, int[] optoSft) {
int len = src.length;
int last = b.length - len;
int i = 0;
next:
while (i<=last) {
for (int j=(len-1); j>=0; j--) {
char c = (char) b[i+j];
c = (((c-'A')|('Z'-c)) >= 0) ? (char)(c + 32) : c;
if (c != src[j]) {
i += Math.max(j + 1 - lastOcc[c&0x7F], optoSft[j]);
continue next;
}
}
return true;
}
return false;
}
/**
* On first invocation, check if the JAR file has the Class-Path
* attribute. A no-op on subsequent calls.
*/
private void checkForSpecialAttributes() throws IOException {
if (hasCheckedSpecialAttributes) return;
if (!isKnownNotToHaveSpecialAttributes()) {
JarEntry manEntry = getManEntry();
if (manEntry != null) {
byte[] b = getBytes(manEntry);
if (match(CLASSPATH_CHARS, b, CLASSPATH_LASTOCC, CLASSPATH_OPTOSFT))
hasClassPathAttribute = true;
}
}
hasCheckedSpecialAttributes = true;
}
private static String javaHome;
private static volatile String[] jarNames;
private boolean isKnownNotToHaveSpecialAttributes() {
// Optimize away even scanning of manifest for jar files we
// deliver which don't have a class-path attribute. If one of
// these jars is changed to include such an attribute this code
// must be changed.
if (javaHome == null) {
javaHome = AccessController.doPrivileged(
new GetPropertyAction("java.home"));
}
if (jarNames == null) {
String[] names = new String[11];
String fileSep = File.separator;
int i = 0;
names[i++] = fileSep + "rt.jar";
names[i++] = fileSep + "jsse.jar";
names[i++] = fileSep + "jce.jar";
names[i++] = fileSep + "charsets.jar";
names[i++] = fileSep + "dnsns.jar";
names[i++] = fileSep + "zipfs.jar";
names[i++] = fileSep + "localedata.jar";
names[i++] = fileSep = "cldrdata.jar";
names[i++] = fileSep + "sunjce_provider.jar";
names[i++] = fileSep + "sunpkcs11.jar";
names[i++] = fileSep + "sunec.jar";
jarNames = names;
}
String name = getName();
String localJavaHome = javaHome;
if (name.startsWith(localJavaHome)) {
String[] names = jarNames;
for (int i = 0; i < names.length; i++) {
if (name.endsWith(names[i])) {
return true;
}
}
}
return false;
}
private synchronized void ensureInitialization() {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (jv != null && !jvInitialized) {
initializeVerifier();
jvInitialized = true;
}
}
JarEntry newEntry(ZipEntry ze) {
return new JarFileEntry(ze);
}
Enumeration<String> entryNames(CodeSource[] cs) {
ensureInitialization();
if (jv != null) {
return jv.entryNames(this, cs);
}
/*
* JAR file has no signed content. Is there a non-signing
* code source?
*/
boolean includeUnsigned = false;
for (int i = 0; i < cs.length; i++) {
if (cs[i].getCodeSigners() == null) {
includeUnsigned = true;
break;
}
}
if (includeUnsigned) {
return unsignedEntryNames();
} else {
return new Enumeration<String>() {
public boolean hasMoreElements() {
return false;
}
public String nextElement() {
throw new NoSuchElementException();
}
};
}
}
/**
* Returns an enumeration of the zip file entries
* excluding internal JAR mechanism entries and including
* signed entries missing from the ZIP directory.
*/
Enumeration<JarEntry> entries2() {
ensureInitialization();
if (jv != null) {
return jv.entries2(this, super.entries());
}
// screen out entries which are never signed
final Enumeration<? extends ZipEntry> enum_ = super.entries();
return new Enumeration<JarEntry>() {
ZipEntry entry;
public boolean hasMoreElements() {
if (entry != null) {
return true;
}
while (enum_.hasMoreElements()) {
ZipEntry ze = enum_.nextElement();
if (JarVerifier.isSigningRelated(ze.getName())) {
continue;
}
entry = ze;
return true;
}
return false;
}
public JarFileEntry nextElement() {
if (hasMoreElements()) {
ZipEntry ze = entry;
entry = null;
return new JarFileEntry(ze);
}
throw new NoSuchElementException();
}
};
}
CodeSource[] getCodeSources(URL url) {
ensureInitialization();
if (jv != null) {
return jv.getCodeSources(this, url);
}
/*
* JAR file has no signed content. Is there a non-signing
* code source?
*/
Enumeration<String> unsigned = unsignedEntryNames();
if (unsigned.hasMoreElements()) {
return new CodeSource[]{JarVerifier.getUnsignedCS(url)};
} else {
return null;
}
}
private Enumeration<String> unsignedEntryNames() {
final Enumeration<JarEntry> entries = entries();
return new Enumeration<String>() {
String name;
/*
* Grab entries from ZIP directory but screen out
* metadata.
*/
public boolean hasMoreElements() {
if (name != null) {
return true;
}
while (entries.hasMoreElements()) {
String value;
ZipEntry e = entries.nextElement();
value = e.getName();
if (e.isDirectory() || JarVerifier.isSigningRelated(value)) {
continue;
}
name = value;
return true;
}
return false;
}
public String nextElement() {
if (hasMoreElements()) {
String value = name;
name = null;
return value;
}
throw new NoSuchElementException();
}
};
}
CodeSource getCodeSource(URL url, String name) {
ensureInitialization();
if (jv != null) {
if (jv.eagerValidation) {
CodeSource cs = null;
JarEntry je = getJarEntry(name);
if (je != null) {
cs = jv.getCodeSource(url, this, je);
} else {
cs = jv.getCodeSource(url, name);
}
return cs;
} else {
return jv.getCodeSource(url, name);
}
}
return JarVerifier.getUnsignedCS(url);
}
void setEagerValidation(boolean eager) {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (jv != null) {
jv.setEagerValidation(eager);
}
}
List<Object> getManifestDigests() {
ensureInitialization();
if (jv != null) {
return jv.getManifestDigests();
}
return new ArrayList<Object>();
}
}
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