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// Copyright (C) 2018 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.change;
import static java.util.Objects.requireNonNull;
import com.google.common.base.Strings;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.ChangeMessage;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.entities.Project;
import com.google.gerrit.extensions.api.changes.DeleteChangeMessageInput;
import com.google.gerrit.extensions.common.ChangeMessageInfo;
import com.google.gerrit.extensions.common.Input;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.server.ChangeMessagesUtil;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.account.AccountLoader;
import com.google.gerrit.server.change.ChangeMessageResource;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.permissions.GlobalPermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.update.BatchUpdate;
import com.google.gerrit.server.update.BatchUpdateOp;
import com.google.gerrit.server.update.ChangeContext;
import com.google.gerrit.server.update.UpdateException;
import com.google.gerrit.server.util.AccountTemplateUtil;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.List;
/** Deletes a change message by rewriting history. */
@Singleton
public class DeleteChangeMessage
implements RestModifyView<ChangeMessageResource, DeleteChangeMessageInput> {
private final Provider<CurrentUser> userProvider;
private final PermissionBackend permissionBackend;
private final BatchUpdate.Factory updateFactory;
private final ChangeMessagesUtil changeMessagesUtil;
private final AccountLoader.Factory accountLoaderFactory;
private final ChangeNotes.Factory notesFactory;
@Inject
public DeleteChangeMessage(
Provider<CurrentUser> userProvider,
PermissionBackend permissionBackend,
BatchUpdate.Factory updateFactory,
ChangeMessagesUtil changeMessagesUtil,
AccountLoader.Factory accountLoaderFactory,
ChangeNotes.Factory notesFactory) {
this.userProvider = userProvider;
this.permissionBackend = permissionBackend;
this.updateFactory = updateFactory;
this.changeMessagesUtil = changeMessagesUtil;
this.accountLoaderFactory = accountLoaderFactory;
this.notesFactory = notesFactory;
}
@Override
public Response<ChangeMessageInfo> apply(
ChangeMessageResource resource, DeleteChangeMessageInput input)
throws RestApiException, PermissionBackendException, UpdateException, IOException {
CurrentUser user = userProvider.get();
permissionBackend.user(user).check(GlobalPermission.ADMINISTRATE_SERVER);
String newChangeMessage =
createNewChangeMessage(user.asIdentifiedUser().getAccountId(), input.reason);
DeleteChangeMessageOp deleteChangeMessageOp =
new DeleteChangeMessageOp(resource.getChangeMessageId(), newChangeMessage);
try (BatchUpdate batchUpdate =
updateFactory.create(resource.getChangeResource().getProject(), user, TimeUtil.now())) {
batchUpdate.addOp(resource.getChangeId(), deleteChangeMessageOp).execute();
}
ChangeMessageInfo updatedMessageInfo =
createUpdatedChangeMessageInfo(
resource.getChangeResource().getId(),
resource.getChangeResource().getProject(),
resource.getChangeMessageIndex());
return Response.created(updatedMessageInfo);
}
private ChangeMessageInfo createUpdatedChangeMessageInfo(
Change.Id cId, Project.NameKey project, int targetIdx) throws PermissionBackendException {
List<ChangeMessage> messages =
changeMessagesUtil.byChange(notesFactory.createChecked(project, cId));
ChangeMessage updatedChangeMessage = messages.get(targetIdx);
AccountLoader accountLoader = accountLoaderFactory.create(true);
ChangeMessageInfo info =
changeMessagesUtil.createChangeMessageInfoWithReplacedTemplates(
updatedChangeMessage, accountLoader);
accountLoader.fill();
return info;
}
public static String createNewChangeMessage(
Account.Id deletedBy, @Nullable String deletedReason) {
requireNonNull(deletedBy, "user must not be null");
if (Strings.isNullOrEmpty(deletedReason)) {
return createNewChangeMessage(deletedBy);
}
return String.format(
"Change message removed by: %s\nReason: %s",
AccountTemplateUtil.getAccountTemplate(deletedBy), deletedReason);
}
public static String createNewChangeMessage(Account.Id deletedBy) {
requireNonNull(deletedBy, "user must not be null");
return "Change message removed by: " + AccountTemplateUtil.getAccountTemplate(deletedBy);
}
private class DeleteChangeMessageOp implements BatchUpdateOp {
private final String targetMessageId;
private final String newMessage;
DeleteChangeMessageOp(String targetMessageIdx, String newMessage) {
this.targetMessageId = targetMessageIdx;
this.newMessage = newMessage;
}
@Override
public boolean updateChange(ChangeContext ctx) {
PatchSet.Id psId = ctx.getChange().currentPatchSetId();
changeMessagesUtil.replaceChangeMessage(ctx.getUpdate(psId), targetMessageId, newMessage);
return true;
}
}
@Singleton
public static class DefaultDeleteChangeMessage
implements RestModifyView<ChangeMessageResource, Input> {
private final DeleteChangeMessage deleteChangeMessage;
@Inject
public DefaultDeleteChangeMessage(DeleteChangeMessage deleteChangeMessage) {
this.deleteChangeMessage = deleteChangeMessage;
}
@Override
public Response<ChangeMessageInfo> apply(ChangeMessageResource resource, Input input)
throws RestApiException, PermissionBackendException, UpdateException, IOException {
return deleteChangeMessage.apply(resource, new DeleteChangeMessageInput());
}
}
}