com.google.gerrit.server.ChangeUtil Maven / Gradle / Ivy
// Copyright (C) 2009 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;
import static java.util.Comparator.comparingInt;
import static java.util.stream.Collectors.toSet;
import com.google.common.collect.Ordering;
import com.google.common.io.BaseEncoding;
import com.google.gerrit.common.FooterConstants;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.server.config.UrlFormatter;
import com.google.gerrit.server.util.CommitMessageUtil;
import com.google.inject.Singleton;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.Random;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
@Singleton
public class ChangeUtil {
public static final int TOPIC_MAX_LENGTH = 2048;
private static final Random UUID_RANDOM = new SecureRandom();
private static final BaseEncoding UUID_ENCODING = BaseEncoding.base16().lowerCase();
public static final Ordering PS_ID_ORDER =
Ordering.from(comparingInt(PatchSet::number));
/** @return a new unique identifier for change message entities. */
public static String messageUuid() {
byte[] buf = new byte[8];
UUID_RANDOM.nextBytes(buf);
return UUID_ENCODING.encode(buf, 0, 4) + '_' + UUID_ENCODING.encode(buf, 4, 4);
}
/**
* Get the next patch set ID from a previously-read map of refs below the change prefix.
*
* @param changeRefNames existing full change ref names with the same change ID as {@code id}.
* @param id previous patch set ID.
* @return next unused patch set ID for the same change, skipping any IDs whose corresponding ref
* names appear in the {@code changeRefs} map.
*/
public static PatchSet.Id nextPatchSetIdFromChangeRefs(
Collection changeRefNames, PatchSet.Id id) {
return nextPatchSetIdFromChangeRefs(changeRefNames.stream(), id);
}
private static PatchSet.Id nextPatchSetIdFromChangeRefs(
Stream changeRefNames, PatchSet.Id id) {
Set existing =
changeRefNames
.map(PatchSet.Id::fromRef)
.filter(psId -> psId != null && psId.changeId().equals(id.changeId()))
.collect(toSet());
PatchSet.Id next = nextPatchSetId(id);
while (existing.contains(next)) {
next = nextPatchSetId(next);
}
return next;
}
/**
* Get the next patch set ID just looking at a single previous patch set ID.
*
* This patch set ID may or may not be available in the database.
*
* @param id previous patch set ID.
* @return next patch set ID for the same change, incrementing by 1.
*/
public static PatchSet.Id nextPatchSetId(PatchSet.Id id) {
return PatchSet.id(id.changeId(), id.get() + 1);
}
/**
* Get the next patch set ID from scanning refs in the repo.
*
* @param git repository to scan for patch set refs.
* @param id previous patch set ID.
* @return next unused patch set ID for the same change, skipping any IDs whose corresponding ref
* names appear in the repository.
*/
public static PatchSet.Id nextPatchSetId(Repository git, PatchSet.Id id) throws IOException {
return nextPatchSetIdFromChangeRefs(
git.getRefDatabase().getRefsByPrefix(id.changeId().toRefPrefix()).stream()
.map(Ref::getName),
id);
}
/**
* Make sure that the change commit message has a correct footer.
*
* @param requireChangeId true if Change-Id is a mandatory footer for the project
* @param currentChangeId current Change-Id value before the commit message is updated
* @param newCommitMessage new commit message for the change
* @throws ResourceConflictException if the new commit message has a missing or invalid Change-Id
* @throws BadRequestException if the new commit message is null or empty
*/
public static void ensureChangeIdIsCorrect(
boolean requireChangeId, String currentChangeId, String newCommitMessage)
throws ResourceConflictException, BadRequestException {
RevCommit revCommit =
RevCommit.parse(
Constants.encode("tree " + ObjectId.zeroId().name() + "\n\n" + newCommitMessage));
// Check that the commit message without footers is not empty
CommitMessageUtil.checkAndSanitizeCommitMessage(revCommit.getShortMessage());
List changeIdFooters = revCommit.getFooterLines(FooterConstants.CHANGE_ID);
if (requireChangeId && changeIdFooters.isEmpty()) {
throw new ResourceConflictException("missing Change-Id footer");
}
if (!changeIdFooters.isEmpty() && !changeIdFooters.get(0).equals(currentChangeId)) {
throw new ResourceConflictException("wrong Change-Id footer");
}
if (changeIdFooters.size() > 1) {
throw new ResourceConflictException("multiple Change-Id footers");
}
}
public static String status(Change c) {
return c != null ? c.getStatus().name().toLowerCase() : "deleted";
}
private static final Pattern LINK_CHANGE_ID_PATTERN = Pattern.compile("I[0-9a-f]{40}");
public static List getChangeIdsFromFooter(RevCommit c, UrlFormatter urlFormatter) {
List changeIds = c.getFooterLines(FooterConstants.CHANGE_ID);
Optional webUrl = urlFormatter.getWebUrl();
if (!webUrl.isPresent()) {
return changeIds;
}
String prefix = webUrl.get() + "id/";
for (String link : c.getFooterLines(FooterConstants.LINK)) {
if (!link.startsWith(prefix)) {
continue;
}
String changeId = link.substring(prefix.length());
Matcher m = LINK_CHANGE_ID_PATTERN.matcher(changeId);
if (m.matches()) {
changeIds.add(changeId);
}
}
return changeIds;
}
private ChangeUtil() {}
}