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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.git.validators;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.reviewdb.client.Account;
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.config.AllUsersName;
import com.google.gerrit.server.events.RefReceivedEvent;
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.plugincontext.PluginSetContext;
import com.google.gerrit.server.validators.ValidationException;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.transport.ReceiveCommand;
public class RefOperationValidators {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final GetErrorMessages GET_ERRORS = new GetErrorMessages();
public interface Factory {
RefOperationValidators create(Project project, IdentifiedUser user, ReceiveCommand cmd);
}
public static ReceiveCommand getCommand(RefUpdate update, ReceiveCommand.Type type) {
return new ReceiveCommand(
update.getExpectedOldObjectId(), update.getNewObjectId(), update.getName(), type);
}
private final PermissionBackend.WithUser perm;
private final AllUsersName allUsersName;
private final PluginSetContext<RefOperationValidationListener> refOperationValidationListeners;
private final RefReceivedEvent event;
@Inject
RefOperationValidators(
PermissionBackend permissionBackend,
AllUsersName allUsersName,
PluginSetContext<RefOperationValidationListener> refOperationValidationListeners,
@Assisted Project project,
@Assisted IdentifiedUser user,
@Assisted ReceiveCommand cmd) {
this.perm = permissionBackend.user(user);
this.allUsersName = allUsersName;
this.refOperationValidationListeners = refOperationValidationListeners;
event = new RefReceivedEvent();
event.command = cmd;
event.project = project;
event.user = user;
}
public List<ValidationMessage> validateForRefOperation() throws RefOperationValidationException {
List<ValidationMessage> messages = new ArrayList<>();
boolean withException = false;
try {
messages.addAll(
new DisallowCreationAndDeletionOfUserBranches(perm, allUsersName).onRefOperation(event));
refOperationValidationListeners.runEach(
l -> l.onRefOperation(event), ValidationException.class);
} catch (ValidationException e) {
messages.add(new ValidationMessage(e.getMessage(), true));
withException = true;
}
if (withException) {
throwException(messages, event);
}
return messages;
}
private void throwException(Iterable<ValidationMessage> messages, RefReceivedEvent event)
throws RefOperationValidationException {
Iterable<ValidationMessage> errors = Iterables.filter(messages, GET_ERRORS);
String header =
String.format(
"Ref \"%s\" %S in project %s validation failed",
event.command.getRefName(), event.command.getType(), event.project.getName());
logger.atSevere().log(header);
throw new RefOperationValidationException(header, errors);
}
private static class GetErrorMessages implements Predicate<ValidationMessage> {
@Override
public boolean apply(ValidationMessage input) {
return input.isError();
}
}
private static class DisallowCreationAndDeletionOfUserBranches
implements RefOperationValidationListener {
private final PermissionBackend.WithUser perm;
private final AllUsersName allUsersName;
DisallowCreationAndDeletionOfUserBranches(
PermissionBackend.WithUser perm, AllUsersName allUsersName) {
this.perm = perm;
this.allUsersName = allUsersName;
}
@Override
public List<ValidationMessage> onRefOperation(RefReceivedEvent refEvent)
throws ValidationException {
if (refEvent.project.getNameKey().equals(allUsersName)) {
if (refEvent.command.getRefName().startsWith(RefNames.REFS_USERS)
&& !refEvent.command.getRefName().equals(RefNames.REFS_USERS_DEFAULT)) {
if (refEvent.command.getType().equals(ReceiveCommand.Type.CREATE)) {
try {
perm.check(GlobalPermission.ACCESS_DATABASE);
} catch (AuthException | PermissionBackendException e) {
throw new ValidationException("Not allowed to create user branch.");
}
if (Account.Id.fromRef(refEvent.command.getRefName()) == null) {
throw new ValidationException(
String.format(
"Not allowed to create non-user branch under %s.", RefNames.REFS_USERS));
}
} else if (refEvent.command.getType().equals(ReceiveCommand.Type.DELETE)) {
try {
perm.check(GlobalPermission.ACCESS_DATABASE);
} catch (AuthException | PermissionBackendException e) {
throw new ValidationException("Not allowed to delete user branch.");
}
}
}
if (RefNames.isGroupRef(refEvent.command.getRefName())) {
if (refEvent.command.getType().equals(ReceiveCommand.Type.CREATE)) {
throw new ValidationException("Not allowed to create group branch.");
} else if (refEvent.command.getType().equals(ReceiveCommand.Type.DELETE)) {
throw new ValidationException("Not allowed to delete group branch.");
}
}
}
return ImmutableList.of();
}
}
}
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