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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 static com.google.gerrit.entities.RefNames.isConfigRef;
import static com.google.gerrit.server.update.context.RefUpdateContext.RefUpdateType.BRANCH_MODIFICATION;
import com.google.common.base.Strings;
import com.google.gerrit.entities.BranchNameKey;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.extensions.api.projects.BranchInfo;
import com.google.gerrit.extensions.api.projects.BranchInput;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestCollectionCreateView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.git.LockFailureException;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.change.ValidationOptionsUtil;
import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
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.project.BranchResource;
import com.google.gerrit.server.project.CreateRefControl;
import com.google.gerrit.server.project.NoSuchProjectException;
import com.google.gerrit.server.project.ProjectResource;
import com.google.gerrit.server.project.RefUtil;
import com.google.gerrit.server.project.RefValidationHelper;
import com.google.gerrit.server.update.context.RefUpdateContext;
import com.google.gerrit.server.util.MagicBranch;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.ReceiveCommand;
@Singleton
public class CreateBranch
implements RestCollectionCreateView {
private final Provider identifiedUser;
private final PermissionBackend permissionBackend;
private final GitRepositoryManager repoManager;
private final GitReferenceUpdated referenceUpdated;
private final RefValidationHelper refCreationValidator;
private final CreateRefControl createRefControl;
@Inject
CreateBranch(
Provider identifiedUser,
PermissionBackend permissionBackend,
GitRepositoryManager repoManager,
GitReferenceUpdated referenceUpdated,
RefValidationHelper.Factory refHelperFactory,
CreateRefControl createRefControl) {
this.identifiedUser = identifiedUser;
this.permissionBackend = permissionBackend;
this.repoManager = repoManager;
this.referenceUpdated = referenceUpdated;
this.refCreationValidator = refHelperFactory.create(ReceiveCommand.Type.CREATE);
this.createRefControl = createRefControl;
}
@Override
public Response apply(ProjectResource rsrc, IdString id, BranchInput input)
throws BadRequestException, AuthException, ResourceConflictException,
UnprocessableEntityException, IOException, PermissionBackendException,
NoSuchProjectException {
try (RefUpdateContext ctx = RefUpdateContext.open(BRANCH_MODIFICATION)) {
String ref = id.get();
if (input == null) {
input = new BranchInput();
}
if (input.ref != null && !ref.equals(input.ref)) {
throw new BadRequestException("ref must match URL");
}
if (input.revision != null) {
input.revision = input.revision.trim();
}
if (Strings.isNullOrEmpty(input.revision)) {
input.revision = Constants.HEAD;
}
while (ref.startsWith("/")) {
ref = ref.substring(1);
}
ref = RefNames.fullName(ref);
if (!Repository.isValidRefName(ref)) {
throw new BadRequestException("invalid branch name \"" + ref + "\"");
}
if (MagicBranch.isMagicBranch(ref)) {
throw new BadRequestException(
"not allowed to create branches under \""
+ MagicBranch.getMagicRefNamePrefix(ref)
+ "\"");
}
if (!isBranchAllowed(ref)) {
throw new BadRequestException(
"Cannot create a branch with name \""
+ ref
+ "\". Not allowed to create branches under Gerrit internal or tags refs.");
}
BranchNameKey name = BranchNameKey.create(rsrc.getNameKey(), ref);
try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
ObjectId revid = RefUtil.parseBaseRevision(repo, input.revision);
RevWalk rw = RefUtil.verifyConnected(repo, revid);
RevObject object = rw.parseAny(revid);
if (ref.startsWith(Constants.R_HEADS)) {
// Ensure that what we start the branch from is a commit. If we
// were given a tag, dereference to the commit instead.
//
object = rw.parseCommit(object);
}
Ref sourceRef = repo.exactRef(input.revision);
if (sourceRef == null) {
createRefControl.checkCreateRef(identifiedUser, repo, name, object, /* forPush= */ false);
} else {
if (sourceRef.isSymbolic()) {
sourceRef = sourceRef.getTarget();
}
createRefControl.checkCreateRef(
identifiedUser,
repo,
name,
object,
/* forPush= */ false,
BranchNameKey.create(rsrc.getNameKey(), sourceRef.getName()));
}
RefUpdate u = repo.updateRef(ref);
u.setExpectedOldObjectId(ObjectId.zeroId());
u.setNewObjectId(object.copy());
u.setRefLogIdent(identifiedUser.get().newRefLogIdent());
u.setRefLogMessage("created via REST from " + input.revision, false);
refCreationValidator.validateRefOperation(
rsrc.getName(),
identifiedUser.get(),
u,
ValidationOptionsUtil.getValidateOptionsAsMultimap(input.validationOptions));
RefUpdate.Result result = u.update(rw);
switch (result) {
case FAST_FORWARD:
case NEW:
case NO_CHANGE:
referenceUpdated.fire(
name.project(), u, ReceiveCommand.Type.CREATE, identifiedUser.get().state());
break;
case LOCK_FAILURE:
if (repo.getRefDatabase().exactRef(ref) != null) {
throw new ResourceConflictException("branch \"" + ref + "\" already exists");
}
String refPrefix = RefUtil.getRefPrefix(ref);
while (!Constants.R_HEADS.equals(refPrefix)) {
if (repo.getRefDatabase().exactRef(refPrefix) != null) {
throw new ResourceConflictException(
"Cannot create branch \""
+ ref
+ "\" since it conflicts with branch \""
+ refPrefix
+ "\".");
}
refPrefix = RefUtil.getRefPrefix(refPrefix);
}
throw new LockFailureException(String.format("Failed to create %s", ref), u);
case FORCED:
case IO_FAILURE:
case NOT_ATTEMPTED:
case REJECTED:
case REJECTED_CURRENT_BRANCH:
case RENAMED:
case REJECTED_MISSING_OBJECT:
case REJECTED_OTHER_REASON:
default:
throw new IOException(String.format("Failed to create %s: %s", ref, result.name()));
}
BranchInfo info = new BranchInfo();
info.ref = ref;
info.revision = revid.getName();
if (isConfigRef(name.branch())) {
// Never allow to delete the meta config branch.
info.canDelete = null;
} else {
info.canDelete =
(permissionBackend.currentUser().ref(name).testOrFalse(RefPermission.DELETE)
&& rsrc.getProjectState().statePermitsWrite())
? true
: null;
}
return Response.created(info);
}
}
}
/** Branches cannot be created under any Gerrit internal or tags refs. */
private boolean isBranchAllowed(String branch) {
return !RefNames.isGerritRef(branch) && !branch.startsWith(RefNames.REFS_TAGS);
}
}
