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// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.change;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.gerrit.extensions.restapi.BinaryResult;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.inject.Inject;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.lib.AbbreviatedObjectId;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.filter.PathFilter;
import org.kohsuke.args4j.Option;
public class GetPatch implements RestReadView<RevisionResource> {
private final GitRepositoryManager repoManager;
private final String FILE_NOT_FOUND = "File not found: %s.";
@Option(name = "--zip")
private boolean zip;
@Option(name = "--download")
private boolean download;
@Option(name = "--path")
private String path;
@Inject
GetPatch(GitRepositoryManager repoManager) {
this.repoManager = repoManager;
}
@Override
public BinaryResult apply(RevisionResource rsrc)
throws ResourceConflictException, IOException, ResourceNotFoundException {
final Repository repo = repoManager.openRepository(rsrc.getProject());
boolean close = true;
try {
final RevWalk rw = new RevWalk(repo);
try {
final RevCommit commit =
rw.parseCommit(ObjectId.fromString(rsrc.getPatchSet().getRevision().get()));
RevCommit[] parents = commit.getParents();
if (parents.length > 1) {
throw new ResourceConflictException("Revision has more than 1 parent.");
} else if (parents.length == 0) {
throw new ResourceConflictException("Revision has no parent.");
}
final RevCommit base = parents[0];
rw.parseBody(base);
BinaryResult bin =
new BinaryResult() {
@Override
public void writeTo(OutputStream out) throws IOException {
if (zip) {
ZipOutputStream zos = new ZipOutputStream(out);
ZipEntry e = new ZipEntry(fileName(rw, commit));
e.setTime(commit.getCommitTime() * 1000L);
zos.putNextEntry(e);
format(zos);
zos.closeEntry();
zos.finish();
} else {
format(out);
}
}
private void format(OutputStream out) throws IOException {
// Only add header if no path is specified
if (path == null) {
out.write(formatEmailHeader(commit).getBytes(UTF_8));
}
try (DiffFormatter fmt = new DiffFormatter(out)) {
fmt.setRepository(repo);
if (path != null) {
fmt.setPathFilter(PathFilter.create(path));
}
fmt.format(base.getTree(), commit.getTree());
fmt.flush();
}
}
@Override
public void close() throws IOException {
rw.close();
repo.close();
}
};
if (path != null && bin.asString().isEmpty()) {
throw new ResourceNotFoundException(String.format(FILE_NOT_FOUND, path));
}
if (zip) {
bin.disableGzip()
.setContentType("application/zip")
.setAttachmentName(fileName(rw, commit) + ".zip");
} else {
bin.base64()
.setContentType("application/mbox")
.setAttachmentName(download ? fileName(rw, commit) + ".base64" : null);
}
close = false;
return bin;
} finally {
if (close) {
rw.close();
}
}
} finally {
if (close) {
repo.close();
}
}
}
public GetPatch setPath(String path) {
this.path = path;
return this;
}
private static String formatEmailHeader(RevCommit commit) {
StringBuilder b = new StringBuilder();
PersonIdent author = commit.getAuthorIdent();
String subject = commit.getShortMessage();
String msg = commit.getFullMessage().substring(subject.length());
if (msg.startsWith("\n\n")) {
msg = msg.substring(2);
}
b.append("From ")
.append(commit.getName())
.append(' ')
.append(
"Mon Sep 17 00:00:00 2001\n") // Fixed timestamp to match output of C Git's format-patch
.append("From: ")
.append(author.getName())
.append(" <")
.append(author.getEmailAddress())
.append(">\n")
.append("Date: ")
.append(formatDate(author))
.append('\n')
.append("Subject: [PATCH] ")
.append(subject)
.append('\n')
.append('\n')
.append(msg);
if (!msg.endsWith("\n")) {
b.append('\n');
}
return b.append("---\n\n").toString();
}
private static String formatDate(PersonIdent author) {
SimpleDateFormat df = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);
df.setCalendar(Calendar.getInstance(author.getTimeZone(), Locale.US));
return df.format(author.getWhen());
}
private static String fileName(RevWalk rw, RevCommit commit) throws IOException {
AbbreviatedObjectId id = rw.getObjectReader().abbreviate(commit, 7);
return id.name() + ".diff";
}
}
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