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/*******************************************************************************
* Copyright (c) 2021 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.signedcontent;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import org.eclipse.osgi.storage.bundlefile.BundleEntry;
import org.eclipse.osgi.storage.bundlefile.BundleFile;
/*
* Converts a BundleFile into an input stream that is appropriate for
* creating a JarInputStream.
*/
public final class BundleToJarInputStream extends InputStream {
private final BundleFile bundlefile;
private final Iterator<String> entryPaths;
private final JarOutputStream jarOutput;
private final ByteArrayOutputStream nextEntryOutput = new ByteArrayOutputStream();
private ByteArrayInputStream nextEntryInput = null;
public BundleToJarInputStream(BundleFile bundleFile) throws IOException {
this.bundlefile = bundleFile;
List<String> entries = new ArrayList<>();
int signatureFileCnt = 0;
for (Enumeration<String> ePaths = bundleFile.getEntryPaths("", true); ePaths.hasMoreElements();) { //$NON-NLS-1$
String entry = ePaths.nextElement();
if (entry.equals(JarFile.MANIFEST_NAME)) {
// this is always read into the stream first and entries follow
entries.add(0, entry);
signatureFileCnt++;
} else if (isSignatureFile(entry)) {
// Add signature files directly after manifest.
entries.add(signatureFileCnt++, entry);
} else {
// everything else is just at the end in order of the enumeration
entries.add(entry);
}
}
entryPaths = entries.iterator();
jarOutput = new JarOutputStream(nextEntryOutput);
}
private boolean isSignatureFile(String entry) {
entry = entry.toUpperCase();
if (entry.startsWith("META-INF/") && entry.indexOf('/', "META-INF/".length()) == -1) { //$NON-NLS-1$ //$NON-NLS-2$
return entry.endsWith(".SF") //$NON-NLS-1$
|| entry.endsWith(".DSA") //$NON-NLS-1$
|| entry.endsWith(".RSA") //$NON-NLS-1$
|| entry.endsWith(".EC"); //$NON-NLS-1$
}
return false;
}
public int read() throws IOException {
if (nextEntryInput != null) {
int result = nextEntryInput.read();
if (result != -1) {
return result;
}
// this entry is done force a new one to be read if there is a next
nextEntryInput = null;
return read();
}
if (entryPaths.hasNext()) {
readNext(entryPaths.next());
if (!entryPaths.hasNext()) {
jarOutput.close();
}
} else {
jarOutput.close();
return -1;
}
return read();
}
private void readNext(String path) throws IOException {
BundleEntry found = bundlefile.getEntry(path);
if (found == null) {
throw new IOException("No entry found: " + path); //$NON-NLS-1$
}
nextEntryOutput.reset();
JarEntry entry = new JarEntry(path);
jarOutput.putNextEntry(entry);
if (!entry.isDirectory()) {
try (InputStream source = found.getInputStream()) {
byte[] buf = new byte[8192];
int length;
while ((length = source.read(buf)) > 0) {
jarOutput.write(buf, 0, length);
}
}
}
jarOutput.closeEntry();
jarOutput.flush();
// now save off the entry we just wrote
nextEntryInput = new ByteArrayInputStream(nextEntryOutput.toByteArray());
}
}
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