com.google.gerrit.server.restapi.project.GetHead Maven / Gradle / Ivy
// 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.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestReadView;
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.ProjectPermission;
import com.google.gerrit.server.permissions.RefPermission;
import com.google.gerrit.server.project.ProjectResource;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
@Singleton
public class GetHead implements RestReadView {
private final GitRepositoryManager repoManager;
private final CommitsCollection commits;
private final PermissionBackend permissionBackend;
@Inject
GetHead(
GitRepositoryManager repoManager,
CommitsCollection commits,
PermissionBackend permissionBackend) {
this.repoManager = repoManager;
this.commits = commits;
this.permissionBackend = permissionBackend;
}
@Override
public String apply(ProjectResource rsrc)
throws AuthException, ResourceNotFoundException, IOException, PermissionBackendException {
rsrc.getProjectState().statePermitsRead();
try (Repository repo = repoManager.openRepository(rsrc.getNameKey())) {
Ref head = repo.getRefDatabase().exactRef(Constants.HEAD);
if (head == null) {
throw new ResourceNotFoundException(Constants.HEAD);
} else if (head.isSymbolic()) {
String n = head.getTarget().getName();
permissionBackend
.user(rsrc.getUser())
.project(rsrc.getNameKey())
.ref(n)
.check(RefPermission.READ);
return n;
} else if (head.getObjectId() != null) {
try (RevWalk rw = new RevWalk(repo)) {
RevCommit commit = rw.parseCommit(head.getObjectId());
if (commits.canRead(rsrc.getProjectState(), repo, commit)) {
return head.getObjectId().name();
}
throw new AuthException("not allowed to see HEAD");
} catch (MissingObjectException | IncorrectObjectTypeException e) {
try {
permissionBackend
.user(rsrc.getUser())
.project(rsrc.getNameKey())
.check(ProjectPermission.WRITE_CONFIG);
} catch (AuthException ae) {
throw new AuthException("not allowed to see HEAD");
}
}
}
throw new ResourceNotFoundException(Constants.HEAD);
} catch (RepositoryNotFoundException e) {
throw new ResourceNotFoundException(rsrc.getName());
}
}
}