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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/update_client/op_zucchini.h"
#include <string>
#include <utility>
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/types/expected.h"
#include "base/values.h"
#include "components/update_client/configurator.h"
#include "components/update_client/crx_cache.h"
#include "components/update_client/patcher.h"
#include "components/update_client/pipeline_util.h"
#include "components/update_client/protocol_definition.h"
#include "components/update_client/task_traits.h"
#include "components/update_client/update_client_errors.h"
#include "components/update_client/utils.h"
#include "components/zucchini/zucchini.h"
namespace update_client {
namespace {
// The sequence of calls is:
//
// [Original Sequence] [Blocking Pool]
//
// ZucchiniOperation
// CacheLookupDone
// Patch
// VerifyAndCleanUp
// PatchDone
// [original callback]
//
// All errors shortcut to PatchDone.
// Runs on the original sequence. Adds events and calls the original callback.
void PatchDone(
base::OnceCallback<void(base::expected<base::FilePath, CategorizedError>)>
callback,
base::RepeatingCallback<void(base::Value::Dict)> event_adder,
base::expected<base::FilePath, CategorizedError> result) {
event_adder.Run(
MakeSimpleOperationEvent(result, protocol_request::kEventZucchini));
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), result));
}
// Runs in the blocking pool. Deletes any files that are no longer needed.
void VerifyAndCleanUp(
base::OnceCallback<void(base::expected<base::FilePath, CategorizedError>)>
callback,
const base::FilePath& patch_file,
const base::FilePath& new_file,
const std::string& output_hash,
int result) {
base::DeleteFile(patch_file);
if (result) {
base::DeleteFile(new_file);
std::move(callback).Run(base::unexpected<CategorizedError>(
{.category = ErrorCategory::kUnpack,
.code = static_cast<int>(UnpackerError::kDeltaOperationFailure),
.extra = result}));
return;
}
if (!VerifyFileHash256(new_file, output_hash)) {
base::DeleteFile(new_file);
std::move(callback).Run(base::unexpected<CategorizedError>(
{.category = ErrorCategory::kUnpack,
.code = static_cast<int>(UnpackerError::kPatchOutHashMismatch)}));
return;
}
std::move(callback).Run(new_file);
}
// Runs in the blocking pool. Opens file handles and applies the patch.
void Patch(
scoped_refptr<Patcher> patcher,
const base::FilePath& old_file,
const base::FilePath& patch_file,
const base::FilePath& temp_dir,
const std::string& output_hash,
base::OnceCallback<void(base::expected<base::FilePath, CategorizedError>)>
callback) {
base::FilePath new_file = temp_dir.Append(FILE_PATH_LITERAL("puffpatch_out"));
patcher->PatchZucchini(
base::File(old_file, base::File::FLAG_OPEN | base::File::FLAG_READ),
base::File(patch_file, base::File::FLAG_OPEN | base::File::FLAG_READ),
base::File(new_file, base::File::FLAG_CREATE | base::File::FLAG_READ |
base::File::FLAG_WRITE |
base::File::FLAG_WIN_EXCLUSIVE_WRITE |
base::File::FLAG_WIN_SHARE_DELETE |
base::File::FLAG_CAN_DELETE_ON_CLOSE),
base::BindOnce(&VerifyAndCleanUp, std::move(callback), patch_file,
new_file, output_hash));
}
// Runs on the original sequence.
void CacheLookupDone(
scoped_refptr<Patcher> patcher,
const base::FilePath& patch_file,
const base::FilePath& temp_dir,
const std::string& output_hash,
base::OnceCallback<void(base::expected<base::FilePath, CategorizedError>)>
callback,
base::expected<base::FilePath, UnpackerError> cache_result) {
if (!cache_result.has_value()) {
base::ThreadPool::PostTaskAndReply(
FROM_HERE, kTaskTraits,
base::BindOnce(IgnoreResult(&base::DeleteFile), patch_file),
base::BindOnce(std::move(callback),
base::unexpected<CategorizedError>(
{.category = ErrorCategory::kUnpack,
.code = static_cast<int>(cache_result.error())})));
return;
}
base::ThreadPool::CreateSequencedTaskRunner(kTaskTraits)
->PostTask(
FROM_HERE,
base::BindOnce(&Patch, patcher, cache_result.value(), patch_file,
temp_dir, output_hash, std::move(callback)));
}
} // namespace
base::OnceClosure ZucchiniOperation(
scoped_refptr<CrxCache> crx_cache,
scoped_refptr<Patcher> patcher,
base::RepeatingCallback<void(base::Value::Dict)> event_adder,
const std::string& previous_hash,
const std::string& output_hash,
const base::FilePath& patch_file,
base::OnceCallback<void(base::expected<base::FilePath, CategorizedError>)>
callback) {
crx_cache->GetByHash(
previous_hash,
base::BindOnce(&CacheLookupDone, patcher, patch_file,
patch_file.DirName(), output_hash,
base::BindPostTaskToCurrentDefault(base::BindOnce(
&PatchDone, std::move(callback), event_adder))));
return base::DoNothing();
}
} // namespace update_client
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