@Override
public Response<List<BlameInfo>> apply(FileResource resource)
throws RestApiException, OrmException, IOException, InvalidChangeOperationException {
if (!allowBlame) {
throw new BadRequestException("blame is disabled");
}
Project.NameKey project = resource.getRevision().getChange().getProject();
try (Repository repository = repoManager.openRepository(project);
ObjectInserter ins = repository.newObjectInserter();
RevWalk revWalk = new RevWalk(ins.newReader())) {
String refName =
resource.getRevision().getEdit().isPresent()
? resource.getRevision().getEdit().get().getRefName()
: resource.getRevision().getPatchSet().getRefName();
Ref ref = repository.findRef(refName);
if (ref == null) {
throw new ResourceNotFoundException("unknown ref " + refName);
}
ObjectId objectId = ref.getObjectId();
RevCommit revCommit = revWalk.parseCommit(objectId);
RevCommit[] parents = revCommit.getParents();
String path = resource.getPatchKey().getFileName();
List<BlameInfo> result;
if (!base) {
result = blame(revCommit, path, repository, revWalk);
} else if (parents.length == 0) {
throw new ResourceNotFoundException("Initial commit doesn't have base");
} else if (parents.length == 1) {
result = blame(parents[0], path, repository, revWalk);
} else if (parents.length == 2) {
ObjectId automerge = autoMerger.merge(repository, revWalk, ins, revCommit, mergeStrategy);
result = blame(automerge, path, repository, revWalk);
} else {
throw new ResourceNotFoundException(
"Cannot generate blame for merge commit with more than 2 parents");
}
Response<List<BlameInfo>> r = Response.ok(result);
if (resource.isCacheable()) {
r.caching(CacheControl.PRIVATE(7, TimeUnit.DAYS));
}
return r;
}
}
