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// Copyright (C) 2021 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.util.stream.Collectors.toSet;
import com.google.common.collect.ImmutableMap;
import com.google.gerrit.entities.Project;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackend.RefFilterOptions;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
public class IncludedInRefs {
protected final GitRepositoryManager repoManager;
protected final PermissionBackend permissionBackend;
@Inject
IncludedInRefs(GitRepositoryManager repoManager, PermissionBackend permissionBackend) {
this.repoManager = repoManager;
this.permissionBackend = permissionBackend;
}
public Map<String, Set<String>> apply(
Project.NameKey project, Set<String> commits, Set<String> refNames)
throws IOException, PermissionBackendException {
try (Repository repo = repoManager.openRepository(project)) {
Set<Ref> visibleRefs = getVisibleRefs(repo, refNames, project);
if (!visibleRefs.isEmpty()) {
try (RevWalk revWalk = new RevWalk(repo)) {
revWalk.setRetainBody(false);
Set<RevCommit> revCommits = getRevCommits(commits, revWalk);
if (!revCommits.isEmpty()) {
return commitsIncludedIn(
revCommits, IncludedInUtil.getSortedRefs(visibleRefs, revWalk), revWalk);
}
}
}
}
return ImmutableMap.of();
}
private Set<Ref> getVisibleRefs(Repository repo, Set<String> refNames, Project.NameKey project)
throws PermissionBackendException {
RefDatabase refDb = repo.getRefDatabase();
Set<Ref> refs = new HashSet<>();
for (String refName : refNames) {
try {
Ref ref = refDb.exactRef(refName);
if (ref != null) {
refs.add(ref);
}
} catch (IOException e) {
// Ignore and continue to process rest of the refs so as to keep
// the behavior similar to the ref not being visible to the user.
// This will ensure that there is no information leak about the
// ref when the ref is corrupted and is not visible to the user.
}
}
return filterReadableRefs(project, refs, repo);
}
private Set<RevCommit> getRevCommits(Set<String> commits, RevWalk revWalk) throws IOException {
Set<RevCommit> revCommits = new HashSet<>();
for (String commit : commits) {
try {
revCommits.add(revWalk.parseCommit(ObjectId.fromString(commit)));
} catch (MissingObjectException | IncorrectObjectTypeException | IllegalArgumentException e) {
// Ignore and continue to process the rest of the commits so as to keep
// the behavior similar to the commit not being included in any of the
// visible specified refs. This will ensure that there is no information
// leak about the commit when the commit is not visible to the user.
}
}
return revCommits;
}
private Map<String, Set<String>> commitsIncludedIn(
Collection<RevCommit> commits, Collection<Ref> refs, RevWalk revWalk) throws IOException {
Map<String, Set<String>> refsByCommit = new HashMap<>();
for (RevCommit commit : commits) {
List<Ref> matchingRefs = revWalk.getMergedInto(commit, refs);
if (matchingRefs.size() > 0) {
refsByCommit.put(
commit.getName(), matchingRefs.stream().map(Ref::getName).collect(toSet()));
}
}
return refsByCommit;
}
/**
* Filter readable refs according to the caller's refs visibility.
*
* @param project specific Gerrit project.
* @param inputRefs a list of refs
* @param repo repository opened for the Gerrit project.
* @return set of visible refs to the caller
*/
private Set<Ref> filterReadableRefs(Project.NameKey project, Set<Ref> inputRefs, Repository repo)
throws PermissionBackendException {
PermissionBackend.ForProject perm = permissionBackend.currentUser().project(project);
return perm.filter(inputRefs, repo, RefFilterOptions.defaults()).stream().collect(toSet());
}
}
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