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// Copyright (C) 2010 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.git;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.project.ProjectControl;
import com.google.gwtorm.server.OrmException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.AbstractAdvertiseRefsHook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class VisibleRefFilter extends AbstractAdvertiseRefsHook {
private static final Logger log =
LoggerFactory.getLogger(VisibleRefFilter.class);
private final TagCache tagCache;
private final Repository db;
private final Project.NameKey projectName;
private final ProjectControl projectCtl;
private final ReviewDb reviewDb;
private final boolean showChanges;
public VisibleRefFilter(final TagCache tagCache, final Repository db,
final ProjectControl projectControl, final ReviewDb reviewDb,
final boolean showChanges) {
this.tagCache = tagCache;
this.db = db;
this.projectName = projectControl.getProject().getNameKey();
this.projectCtl = projectControl;
this.reviewDb = reviewDb;
this.showChanges = showChanges;
}
public Map<String, Ref> filter(Map<String, Ref> refs, boolean filterTagsSeperately) {
if (projectCtl.allRefsAreVisibleExcept(
ImmutableSet.of(GitRepositoryManager.REF_CONFIG))) {
Map<String, Ref> r = Maps.newHashMap(refs);
r.remove(GitRepositoryManager.REF_CONFIG);
return r;
}
final Set<Change.Id> visibleChanges = visibleChanges();
final Map<String, Ref> result = new HashMap<String, Ref>();
final List<Ref> deferredTags = new ArrayList<Ref>();
for (Ref ref : refs.values()) {
if (ref.getName().startsWith(GitRepositoryManager.REFS_CACHE_AUTOMERGE)) {
continue;
} else if (PatchSet.isRef(ref.getName())) {
// Reference to a patch set is visible if the change is visible.
//
if (visibleChanges.contains(Change.Id.fromRef(ref.getName()))) {
result.put(ref.getName(), ref);
}
} else if (isTag(ref)) {
// If its a tag, consider it later.
//
if (ref.getObjectId() != null) {
deferredTags.add(ref);
}
} else if (projectCtl.controlForRef(ref.getLeaf().getName()).isVisible()) {
// Use the leaf to lookup the control data. If the reference is
// symbolic we want the control around the final target. If its
// not symbolic then getLeaf() is a no-op returning ref itself.
//
result.put(ref.getName(), ref);
}
}
// If we have tags that were deferred, we need to do a revision walk
// to identify what tags we can actually reach, and what we cannot.
//
if (!deferredTags.isEmpty() && (!result.isEmpty() || filterTagsSeperately)) {
TagMatcher tags = tagCache.get(projectName).matcher(
tagCache,
db,
filterTagsSeperately ? filter(refs).values() : result.values());
for (Ref tag : deferredTags) {
if (tags.isReachable(tag)) {
result.put(tag.getName(), tag);
}
}
}
return result;
}
@Override
protected Map<String, Ref> getAdvertisedRefs(
Repository repository, RevWalk revWalk) {
return filter(repository.getAllRefs());
}
private Map<String, Ref> filter(Map<String, Ref> refs) {
return filter(refs, false);
}
private Set<Change.Id> visibleChanges() {
if (!showChanges) {
return Collections.emptySet();
}
final Project project = projectCtl.getProject();
try {
final Set<Change.Id> visibleChanges = new HashSet<Change.Id>();
for (Change change : reviewDb.changes().byProject(project.getNameKey())) {
if (projectCtl.controlFor(change).isVisible(reviewDb)) {
visibleChanges.add(change.getId());
}
}
return visibleChanges;
} catch (OrmException e) {
log.error("Cannot load changes for project " + project.getName()
+ ", assuming no changes are visible", e);
return Collections.emptySet();
}
}
private static boolean isTag(Ref ref) {
return ref.getLeaf().getName().startsWith(Constants.R_TAGS);
}
}
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