java.util.jar.JarEntry Maven / Gradle / Ivy
Show all versions of android-all Show documentation
/*
* 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 java.util.jar;
import java.io.IOException;
import java.security.CodeSigner;
import java.security.cert.CertPath;
import java.security.cert.CertPathValidator;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.zip.ZipEntry;
/**
* Represents a single file in a JAR archive together with the manifest
* attributes and digital signatures associated with it.
*
* @see JarFile
* @see JarInputStream
*/
public class JarEntry extends ZipEntry {
private Attributes attributes;
final JarFile parentJar;
CodeSigner signers[];
// Cached factory used to build CertPath-s in getCodeSigners().
private CertificateFactory factory;
private boolean isFactoryChecked = false;
/**
* Creates a new {@code JarEntry} named name.
*
* @param name
* The name of the new {@code JarEntry}.
*/
public JarEntry(String name) {
super(name);
parentJar = null;
}
/**
* Creates a new {@code JarEntry} using the values obtained from entry.
*
* @param entry
* The ZipEntry to obtain values from.
*/
public JarEntry(ZipEntry entry) {
this(entry, null);
}
JarEntry(ZipEntry entry, JarFile parentJar) {
super(entry);
this.parentJar = parentJar;
}
/**
* Create a new {@code JarEntry} using the values obtained from the
* argument.
*
* @param je
* The {@code JarEntry} to obtain values from.
*/
public JarEntry(JarEntry je) {
super(je);
parentJar = je.parentJar;
attributes = je.attributes;
signers = je.signers;
}
/**
* Returns the {@code Attributes} object associated with this entry or
* {@code null} if none exists.
*
* @return the {@code Attributes} for this entry.
* @throws IOException
* If an error occurs obtaining the {@code Attributes}.
* @see Attributes
*/
public Attributes getAttributes() throws IOException {
if (attributes != null || parentJar == null) {
return attributes;
}
Manifest manifest = parentJar.getManifest();
if (manifest == null) {
return null;
}
return attributes = manifest.getAttributes(getName());
}
/**
* Returns an array of {@code Certificate} Objects associated with this
* entry or {@code null} if none exists. Make sure that the everything is
* read from the input stream before calling this method, or else the method
* returns {@code null}.
*
* This method returns all the signers' unverified chains concatenated
* together in one array. To know which certificates were tied to the
* private keys that made the signatures on this entry, see
* {@link #getCodeSigners()} instead.
*
* @see java.security.cert.Certificate
*/
public Certificate[] getCertificates() {
if (parentJar == null) {
return null;
}
JarVerifier jarVerifier = parentJar.verifier;
if (jarVerifier == null) {
return null;
}
Certificate[][] certChains = jarVerifier.getCertificateChains(getName());
if (certChains == null) {
return null;
}
// Measure number of certs.
int count = 0;
for (Certificate[] chain : certChains) {
count += chain.length;
}
// Create new array and copy all the certs into it.
Certificate[] certs = new Certificate[count];
int i = 0;
for (Certificate[] chain : certChains) {
System.arraycopy(chain, 0, certs, i, chain.length);
i += chain.length;
}
return certs;
}
void setAttributes(Attributes attrib) {
attributes = attrib;
}
/**
* Returns the code signers for the digital signatures associated with the
* JAR file. If there is no such code signer, it returns {@code null}. Make
* sure that the everything is read from the input stream before calling
* this method, or else the method returns {@code null}.
*
* Only the digital signature on the entry is cryptographically verified.
* None of the certificates in the the {@link CertPath} returned from
* {@link CodeSigner#getSignerCertPath()} are verified and must be verified
* by the caller if needed. See {@link CertPathValidator} for more
* information.
*
* @return an array of CodeSigner for this JAR entry.
* @see CodeSigner
*/
public CodeSigner[] getCodeSigners() {
if (parentJar == null) {
return null;
}
JarVerifier jarVerifier = parentJar.verifier;
if (jarVerifier == null) {
return null;
}
if (signers == null) {
signers = getCodeSigners(jarVerifier.getCertificateChains(getName()));
}
if (signers == null) {
return null;
}
return signers.clone();
}
private CodeSigner[] getCodeSigners(Certificate[][] certChains) {
if (certChains == null) {
return null;
}
ArrayList asigners = new ArrayList(certChains.length);
for (Certificate[] chain : certChains) {
addCodeSigner(asigners, chain);
}
CodeSigner[] tmp = new CodeSigner[asigners.size()];
asigners.toArray(tmp);
return tmp;
}
private void addCodeSigner(ArrayList asigners, Certificate[] certs) {
for (Certificate cert : certs) {
// Only X509Certificate instances are counted. See API spec.
if (!(cert instanceof X509Certificate)) {
return;
}
}
CertPath certPath = null;
if (!isFactoryChecked) {
try {
factory = CertificateFactory.getInstance("X.509");
} catch (CertificateException ex) {
// do nothing
} finally {
isFactoryChecked = true;
}
}
if (factory == null) {
return;
}
try {
certPath = factory.generateCertPath(Arrays.asList(certs));
} catch (CertificateException ex) {
// do nothing
}
if (certPath != null) {
asigners.add(new CodeSigner(certPath, null));
}
}
}