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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.restapi.project;
import com.google.common.base.Strings;
import com.google.gerrit.extensions.api.projects.HeadInput;
import com.google.gerrit.extensions.events.HeadUpdatedListener;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.extensions.events.AbstractNoNotifyEvent;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.permissions.RefPermission;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import com.google.gerrit.server.project.ProjectResource;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Map;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
@Singleton
public class SetHead implements RestModifyView<ProjectResource, HeadInput> {
private final GitRepositoryManager repoManager;
private final Provider<IdentifiedUser> identifiedUser;
private final PluginSetContext<HeadUpdatedListener> headUpdatedListeners;
private final PermissionBackend permissionBackend;
@Inject
SetHead(
GitRepositoryManager repoManager,
Provider<IdentifiedUser> identifiedUser,
PluginSetContext<HeadUpdatedListener> headUpdatedListeners,
PermissionBackend permissionBackend) {
this.repoManager = repoManager;
this.identifiedUser = identifiedUser;
this.headUpdatedListeners = headUpdatedListeners;
this.permissionBackend = permissionBackend;
}
@Override
public String apply(ProjectResource rsrc, HeadInput input)
throws AuthException, ResourceNotFoundException, BadRequestException,
UnprocessableEntityException, IOException, PermissionBackendException {
if (input == null || Strings.isNullOrEmpty(input.ref)) {
throw new BadRequestException("ref required");
}
String ref = RefNames.fullName(input.ref);
permissionBackend
.user(rsrc.getUser())
.project(rsrc.getNameKey())
.ref(ref)
.check(RefPermission.SET_HEAD);
try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
Map<String, Ref> cur = repo.getRefDatabase().exactRef(Constants.HEAD, ref);
if (!cur.containsKey(ref)) {
throw new UnprocessableEntityException(String.format("Ref Not Found: %s", ref));
}
final String oldHead = cur.get(Constants.HEAD).getTarget().getName();
final String newHead = ref;
if (!oldHead.equals(newHead)) {
final RefUpdate u = repo.updateRef(Constants.HEAD, true);
u.setRefLogIdent(identifiedUser.get().newRefLogIdent());
RefUpdate.Result res = u.link(newHead);
switch (res) {
case NO_CHANGE:
case RENAMED:
case FORCED:
case NEW:
break;
case FAST_FORWARD:
case IO_FAILURE:
case LOCK_FAILURE:
case NOT_ATTEMPTED:
case REJECTED:
case REJECTED_CURRENT_BRANCH:
case REJECTED_MISSING_OBJECT:
case REJECTED_OTHER_REASON:
default:
throw new IOException("Setting HEAD failed with " + res);
}
fire(rsrc.getNameKey(), oldHead, newHead);
}
return ref;
} catch (RepositoryNotFoundException e) {
throw new ResourceNotFoundException(rsrc.getName());
}
}
private void fire(Project.NameKey nameKey, String oldHead, String newHead) {
if (headUpdatedListeners.isEmpty()) {
return;
}
Event event = new Event(nameKey, oldHead, newHead);
headUpdatedListeners.runEach(l -> l.onHeadUpdated(event));
}
static class Event extends AbstractNoNotifyEvent implements HeadUpdatedListener.Event {
private final Project.NameKey nameKey;
private final String oldHead;
private final String newHead;
Event(Project.NameKey nameKey, String oldHead, String newHead) {
this.nameKey = nameKey;
this.oldHead = oldHead;
this.newHead = newHead;
}
@Override
public String getProjectName() {
return nameKey.get();
}
@Override
public String getOldHeadName() {
return oldHead;
}
@Override
public String getNewHeadName() {
return newHead;
}
}
}
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