author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 42752 | jdk/src/java.base/share/classes/jdk/internal/module/ModuleHashes.java@844691c73832 |
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/* |
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.internal.module; |
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import java.io.IOException; |
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import java.io.UncheckedIOException; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.FileChannel; |
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import java.nio.file.Path; |
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import java.security.MessageDigest; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.Objects; |
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import java.util.Set; |
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/** |
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* The result of hashing the contents of a number of module artifacts. |
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*/ |
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public final class ModuleHashes { |
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/** |
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* A supplier of a message digest. |
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*/ |
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public static interface HashSupplier { |
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byte[] generate(String algorithm); |
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} |
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private final String algorithm; |
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private final Map<String, byte[]> nameToHash; |
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/** |
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* Creates a {@code ModuleHashes}. |
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* |
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* @param algorithm the algorithm used to create the hashes |
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* @param nameToHash the map of module name to hash value |
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public ModuleHashes(String algorithm, Map<String, byte[]> nameToHash) { |
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this.algorithm = algorithm; |
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this.nameToHash = Collections.unmodifiableMap(nameToHash); |
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} |
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/** |
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* Returns the algorithm used to hash the modules ("SHA-256" for example). |
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*/ |
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public String algorithm() { |
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return algorithm; |
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} |
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/** |
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* Returns the set of module names for which hashes are recorded. |
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*/ |
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public Set<String> names() { |
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return nameToHash.keySet(); |
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} |
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/** |
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* Returns the hash for the given module name, {@code null} |
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* if there is no hash recorded for the module. |
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*/ |
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public byte[] hashFor(String mn) { |
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return nameToHash.get(mn); |
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} |
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/** |
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* Returns unmodifiable map of module name to hash |
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public Map<String, byte[]> hashes() { |
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return nameToHash; |
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} |
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/** |
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* Computes the hash for the given file with the given message digest |
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* algorithm. |
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* |
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* @throws UncheckedIOException if an I/O error occurs |
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* @throws RuntimeException if the algorithm is not available |
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*/ |
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public static byte[] computeHash(Path file, String algorithm) { |
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try { |
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MessageDigest md = MessageDigest.getInstance(algorithm); |
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// Ideally we would just mmap the file but this consumes too much |
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// memory when jlink is running concurrently on very large jmods |
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try (FileChannel fc = FileChannel.open(file)) { |
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ByteBuffer bb = ByteBuffer.allocate(32*1024); |
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while (fc.read(bb) > 0) { |
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bb.flip(); |
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md.update(bb); |
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assert bb.remaining() == 0; |
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bb.clear(); |
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} |
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} |
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return md.digest(); |
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} catch (NoSuchAlgorithmException e) { |
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throw new RuntimeException(e); |
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} catch (IOException ioe) { |
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throw new UncheckedIOException(ioe); |
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} |
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} |
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/** |
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* Computes the hash for every entry in the given map, returning a |
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* {@code ModuleHashes} to encapsulate the result. The map key is |
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* the entry name, typically the module name. The map value is the file |
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* path to the entry (module artifact). |
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* |
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* @return ModuleHashes that encapsulates the hashes |
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*/ |
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public static ModuleHashes generate(Map<String, Path> map, String algorithm) { |
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Map<String, byte[]> nameToHash = new HashMap<>(); |
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for (Map.Entry<String, Path> entry: map.entrySet()) { |
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String name = entry.getKey(); |
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Path path = entry.getValue(); |
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nameToHash.put(name, computeHash(path, algorithm)); |
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} |
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return new ModuleHashes(algorithm, nameToHash); |
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} |
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/** |
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* This is used by jdk.internal.module.SystemModules class |
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* generated at link time. |
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*/ |
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public static class Builder { |
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final String algorithm; |
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final Map<String, byte[]> nameToHash; |
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Builder(String algorithm, int initialCapacity) { |
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this.nameToHash = new HashMap<>(initialCapacity); |
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this.algorithm = Objects.requireNonNull(algorithm); |
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} |
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/** |
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* Sets the module hash for the given module name |
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*/ |
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public Builder hashForModule(String mn, byte[] hash) { |
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nameToHash.put(mn, hash); |
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return this; |
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} |
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/** |
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* Builds a {@code ModuleHashes}. |
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*/ |
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public ModuleHashes build() { |
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if (!nameToHash.isEmpty()) { |
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return new ModuleHashes(algorithm, nameToHash); |
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} else { |
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return null; |
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} |
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} |
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} |
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} |