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/******************************************************************************* * Copyright (c) 2018 Red Hat Inc. and others. * All rights reserved. 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: * Red Hat Inc. - initial API and implementation *******************************************************************************/package org.eclipse.jdt.ls.core.internal.managers;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.nio.file.Files;import java.nio.file.Path;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.Arrays;import java.util.HashMap;import java.util.Map;import org.eclipse.core.runtime.CoreException;import org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin;import org.eclipse.jdt.ls.core.internal.StatusFactory;/** * @author Thomas Mäder * * This class handles digests for build files. It serves to prevent * unnecessary updating of maven/gradle, etc. info on workspace * projects. */public class DigestStore { private Map<String, String> fileDigests; private File stateFile; private static final String SERIALIZATION_FILE_NAME = ".file-digests"; public DigestStore(File stateLocation) { this.stateFile = new File(stateLocation, SERIALIZATION_FILE_NAME); if (stateFile.isFile()) { fileDigests = deserializeFileDigests(); } else { fileDigests = new HashMap<>(); } } /** * Updates the digest for the given path. * * @param p * Path to the file in questions * @return whether the file is considered changed and the associated project * should be updated * @throws CoreException * if a digest cannot be computed */ public boolean updateDigest(Path p) throws CoreException { try { String digest = computeDigest(p); synchronized (fileDigests) { if (!digest.equals(fileDigests.get(p.toString()))) { fileDigests.put(p.toString(), digest); serializeFileDigests(); return true; } else { return false; } } } catch (NoSuchAlgorithmException | IOException e) { throw new CoreException(StatusFactory.newErrorStatus("Exception updating digest for " + p, e)); } } private void serializeFileDigests() { try (ObjectOutputStream outStream = new ObjectOutputStream(new FileOutputStream(stateFile))) { outStream.writeObject(fileDigests); } catch (IOException e) { JavaLanguageServerPlugin.logException("Exception occured while serialization of file digests", e); } } @SuppressWarnings("unchecked") private Map<String, String> deserializeFileDigests() { try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(stateFile))) { return (Map<String, String>) ois.readObject(); } catch (IOException | ClassNotFoundException e) { JavaLanguageServerPlugin.logException("Exception occured while deserialization of file digests", e); return new HashMap<>(); } } private String computeDigest(Path path) throws IOException, NoSuchAlgorithmException { byte[] fileBytes = Files.readAllBytes(path); // BUG: CWE-328: Use of Weak Hash// byte[] digest = MessageDigest.getInstance("MD5").digest(fileBytes);// FIXED: return Arrays.toString(digest); }} |