| /* |
| * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| package org.eclipse.jgit.lfs.internal; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.file.Path; |
| import java.security.DigestOutputStream; |
| import java.text.MessageFormat; |
| |
| import org.eclipse.jgit.annotations.Nullable; |
| import org.eclipse.jgit.internal.storage.file.LockFile; |
| import org.eclipse.jgit.lfs.errors.CorruptLongObjectException; |
| import org.eclipse.jgit.lfs.lib.AnyLongObjectId; |
| import org.eclipse.jgit.lfs.lib.Constants; |
| import org.eclipse.jgit.lfs.lib.LongObjectId; |
| |
| /** |
| * Output stream writing content to a |
| * {@link org.eclipse.jgit.internal.storage.file.LockFile} which is committed on |
| * close(). The stream checks if the hash of the stream content matches the id. |
| */ |
| public class AtomicObjectOutputStream extends OutputStream { |
| |
| private LockFile locked; |
| |
| private DigestOutputStream out; |
| |
| private boolean aborted; |
| |
| private AnyLongObjectId id; |
| |
| /** |
| * Constructor for AtomicObjectOutputStream. |
| * |
| * @param path |
| * a {@link java.nio.file.Path} object. |
| * @param id |
| * a {@link org.eclipse.jgit.lfs.lib.AnyLongObjectId} object. |
| * @throws java.io.IOException |
| * if an IO error occurred |
| */ |
| public AtomicObjectOutputStream(Path path, AnyLongObjectId id) |
| throws IOException { |
| locked = new LockFile(path.toFile()); |
| locked.lock(); |
| this.id = id; |
| out = new DigestOutputStream(locked.getOutputStream(), |
| Constants.newMessageDigest()); |
| } |
| |
| /** |
| * Constructor for AtomicObjectOutputStream. |
| * |
| * @param path |
| * a {@link java.nio.file.Path} object. |
| * @throws java.io.IOException |
| * if an IO error occurred |
| */ |
| public AtomicObjectOutputStream(Path path) throws IOException { |
| this(path, null); |
| } |
| |
| /** |
| * Get the <code>id</code>. |
| * |
| * @return content hash of the object which was streamed through this |
| * stream. May return {@code null} if called before closing this |
| * stream. |
| */ |
| @Nullable |
| public AnyLongObjectId getId() { |
| return id; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| out.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| out.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| out.write(b, off, len); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| out.close(); |
| if (!aborted) { |
| if (id != null) { |
| verifyHash(); |
| } else { |
| id = LongObjectId.fromRaw(out.getMessageDigest().digest()); |
| } |
| locked.commit(); |
| } |
| } |
| |
| private void verifyHash() { |
| AnyLongObjectId contentHash = LongObjectId |
| .fromRaw(out.getMessageDigest().digest()); |
| if (!contentHash.equals(id)) { |
| abort(); |
| throw new CorruptLongObjectException(id, contentHash, |
| MessageFormat.format(LfsText.get().corruptLongObject, |
| contentHash, id)); |
| } |
| } |
| |
| /** |
| * Aborts the stream. Temporary file will be deleted |
| */ |
| public void abort() { |
| locked.unlock(); |
| aborted = true; |
| } |
| } |