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/*******************************************************************************
* Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Iterator;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.util.regex.Pattern;
/**
* Support class to filter entries from JARs related to signatures.
*/
public class SignatureRemover {
private static final Pattern SIGNATURE_FILES = Pattern
.compile("META-INF/[^/]*\\.SF|" //
+ "META-INF/[^/]*\\.DSA|" //
+ "META-INF/[^/]*\\.RSA|" //
+ "META-INF/SIG-[^/]*");
private static final String MANIFEST_MF = "META-INF/MANIFEST.MF";
private static final String DIGEST_SUFFIX = "-Digest";
private boolean active;
/**
* Creates a new remover which is active.
*/
public SignatureRemover() {
active = true;
}
/**
* Defines whether this remover should be active. If it is not active it
* will not remove any entries.
*
* @param active
* <code>true</code> if it should remove signature related
* entries.
*/
public void setActive(final boolean active) {
this.active = active;
}
/**
* Checks whether a entry with the provided name should be ignored at all.
*
* @param name
* path name of the entry in question
* @return true is the entry should be ignored
*/
public boolean removeEntry(final String name) {
return active && SIGNATURE_FILES.matcher(name).matches();
}
/**
* Filters the content of the entry with the provided name if necessary.
*
* @param name
* path name of the entry in question
* @param in
* source for the element to filter
* @param out
* output for the filtered contents
* @return <code>true</code> if the content was filtered
* @throws IOException
* if the content can't be read or written
*/
public boolean filterEntry(final String name, final InputStream in,
final OutputStream out) throws IOException {
if (!active || !MANIFEST_MF.equals(name)) {
return false;
}
final Manifest mf = new Manifest(in);
filterManifestEntry(mf.getEntries().values());
mf.write(out);
return true;
}
private void filterManifestEntry(final Collection<Attributes> entry) {
for (final Iterator<Attributes> i = entry.iterator(); i.hasNext();) {
final Attributes attributes = i.next();
filterManifestEntryAttributes(attributes);
if (attributes.isEmpty()) {
i.remove();
}
}
}
private void filterManifestEntryAttributes(final Attributes attrs) {
for (final Iterator<Object> i = attrs.keySet().iterator(); i.hasNext();) {
if (String.valueOf(i.next()).endsWith(DIGEST_SUFFIX)) {
i.remove();
}
}
}
}
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