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// Copyright (C) 2014 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.restapi.project;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.ChildCollection;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.index.change.ChangeIndexCollection;
import com.google.gerrit.server.project.CommitResource;
import com.google.gerrit.server.project.ProjectResource;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.project.Reachable;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.List;
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.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
@Singleton
public class CommitsCollection implements ChildCollection<ProjectResource, CommitResource> {
private final DynamicMap<RestView<CommitResource>> views;
private final GitRepositoryManager repoManager;
private final ChangeIndexCollection indexes;
private final Provider<InternalChangeQuery> queryProvider;
private final Reachable reachable;
@Inject
public CommitsCollection(
DynamicMap<RestView<CommitResource>> views,
GitRepositoryManager repoManager,
ChangeIndexCollection indexes,
Provider<InternalChangeQuery> queryProvider,
Reachable reachable) {
this.views = views;
this.repoManager = repoManager;
this.indexes = indexes;
this.queryProvider = queryProvider;
this.reachable = reachable;
}
@Override
public RestView<ProjectResource> list() throws ResourceNotFoundException {
throw new ResourceNotFoundException();
}
@Override
public CommitResource parse(ProjectResource parent, IdString id)
throws RestApiException, IOException {
parent.getProjectState().checkStatePermitsRead();
ObjectId objectId;
try {
objectId = ObjectId.fromString(id.get());
} catch (IllegalArgumentException e) {
throw new ResourceNotFoundException(id);
}
try (Repository repo = repoManager.openRepository(parent.getNameKey());
RevWalk rw = new RevWalk(repo)) {
RevCommit commit = rw.parseCommit(objectId);
rw.parseBody(commit);
if (!canRead(parent.getProjectState(), repo, commit)) {
throw new ResourceNotFoundException(id);
}
for (int i = 0; i < commit.getParentCount(); i++) {
rw.parseBody(rw.parseCommit(commit.getParent(i)));
}
return new CommitResource(parent, commit);
} catch (MissingObjectException | IncorrectObjectTypeException e) {
throw new ResourceNotFoundException(id);
}
}
@Override
public DynamicMap<RestView<CommitResource>> views() {
return views;
}
/** @return true if {@code commit} is visible to the caller. */
public boolean canRead(ProjectState state, Repository repo, RevCommit commit) throws IOException {
Project.NameKey project = state.getNameKey();
if (indexes.getSearchIndex() == null) {
// No index in slaves, fall back to scanning refs.
return reachable.fromRefs(project, repo, commit, repo.getRefDatabase().getRefs());
}
// Check first if any change references the commit in question. This is much cheaper than ref
// visibility filtering and reachability computation.
List<ChangeData> changes =
queryProvider.get().enforceVisibility(true).setLimit(1).byProjectCommit(project, commit);
if (!changes.isEmpty()) {
return true;
}
// If we have already checked change refs using the change index, spare any further checks for
// changes.
List<Ref> refs =
repo.getRefDatabase().getRefs().stream()
.filter(r -> !r.getName().startsWith(RefNames.REFS_CHANGES))
.collect(toImmutableList());
return reachable.fromRefs(project, repo, commit, refs);
}
}