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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 static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.Project;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.extensions.restapi.AuthException;
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 java.util.Locale;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.transport.ReceiveCommand;
/**
* Collection of validation listeners that are called before a ref update is performed with the
* command to be run. This is called from the git push path as well as Gerrit's handlers for
* creating or deleting refs. Calls out to {@link RefOperationValidationListener} provided by
* plugins.
*/
public class RefOperationValidators {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public interface Factory {
RefOperationValidators create(
Project project,
IdentifiedUser user,
ReceiveCommand cmd,
ImmutableListMultimap pushOptions);
}
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 refOperationValidationListeners;
private final RefReceivedEvent event;
@Inject
RefOperationValidators(
PermissionBackend permissionBackend,
AllUsersName allUsersName,
PluginSetContext refOperationValidationListeners,
@Assisted Project project,
@Assisted IdentifiedUser user,
@Assisted ReceiveCommand cmd,
@Assisted ImmutableListMultimap pushOptions) {
this.perm = permissionBackend.user(user);
this.allUsersName = allUsersName;
this.refOperationValidationListeners = refOperationValidationListeners;
event = new RefReceivedEvent();
event.command = cmd;
event.project = project;
event.user = user;
event.pushOptions = pushOptions;
}
/**
* Returns informational validation messages and throws a {@link RefOperationValidationException}
* when the first validator fails. Will not process any more validators after the first failure
* was encountered.
*/
public List validateForRefOperation() throws RefOperationValidationException {
List messages = new ArrayList<>();
boolean withException = false;
try {
messages.addAll(
new DisallowCreationAndDeletionOfGerritMaintainedBranches(perm, allUsersName)
.onRefOperation(event));
refOperationValidationListeners.runEach(
l -> messages.addAll(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(List messages, RefReceivedEvent event)
throws RefOperationValidationException {
String header =
String.format(
"Validation for %s of ref '%s' in project %s failed:",
formatReceiveCommandType(event.command.getType()),
event.command.getRefName(),
event.project.getName());
logger.atSevere().log("%s", header);
throw new RefOperationValidationException(
header, messages.stream().filter(ValidationMessage::isError).collect(toImmutableList()));
}
private static String formatReceiveCommandType(ReceiveCommand.Type type) {
switch (type) {
case CREATE:
return "creation";
case DELETE:
return "deletion";
case UPDATE:
return "update";
case UPDATE_NONFASTFORWARD:
return "non-fast-forward update";
default:
return type.toString().toLowerCase(Locale.US);
}
}
private static class DisallowCreationAndDeletionOfGerritMaintainedBranches
implements RefOperationValidationListener {
private final PermissionBackend.WithUser perm;
private final AllUsersName allUsersName;
DisallowCreationAndDeletionOfGerritMaintainedBranches(
PermissionBackend.WithUser perm, AllUsersName allUsersName) {
this.perm = perm;
this.allUsersName = allUsersName;
}
@Override
public List 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 {
if (!perm.test(GlobalPermission.ACCESS_DATABASE)) {
throw new ValidationException("Not allowed to create user branch.");
}
} catch (PermissionBackendException e) {
throw new ValidationException("Not allowed to create user branch.", e);
}
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.", e);
}
}
}
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();
}
}
}
