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// Copyright 2014 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/crx_downloader.h"
#include <utility>
#include "base/check_op.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/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_WIN)
#include "components/update_client/background_downloader_win.h"
#endif
#include "components/update_client/network.h"
#include "components/update_client/task_traits.h"
#include "components/update_client/update_client_errors.h"
#include "components/update_client/update_client_metrics.h"
#include "components/update_client/url_fetcher_downloader.h"
#include "components/update_client/utils.h"
namespace update_client {
CrxDownloader::CrxDownloader(scoped_refptr<CrxDownloader> successor)
: main_task_runner_(base::SequencedTaskRunner::GetCurrentDefault()),
successor_(std::move(successor)) {}
CrxDownloader::~CrxDownloader() = default;
void CrxDownloader::set_progress_callback(
const ProgressCallback& progress_callback) {
progress_callback_ = progress_callback;
}
GURL CrxDownloader::url() const {
return current_url_ != urls_.end() ? *current_url_ : GURL();
}
const std::vector<CrxDownloader::DownloadMetrics>
CrxDownloader::download_metrics() const {
if (!successor_) {
return download_metrics_;
}
std::vector<DownloadMetrics> retval(successor_->download_metrics());
retval.insert(retval.begin(), download_metrics_.begin(),
download_metrics_.end());
return retval;
}
base::OnceClosure CrxDownloader::StartDownloadFromUrl(
const GURL& url,
const std::string& expected_hash,
DownloadCallback download_callback) {
std::vector<GURL> urls;
urls.push_back(url);
return StartDownload(urls, expected_hash, std::move(download_callback));
}
base::OnceClosure CrxDownloader::StartDownload(
const std::vector<GURL>& urls,
const std::string& expected_hash,
DownloadCallback download_callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto error = CrxDownloaderError::NONE;
if (urls.empty()) {
error = CrxDownloaderError::NO_URL;
} else if (expected_hash.empty()) {
error = CrxDownloaderError::NO_HASH;
}
if (error != CrxDownloaderError::NONE) {
Result result;
result.error = static_cast<int>(error);
main_task_runner()->PostTask(
FROM_HERE, base::BindOnce(std::move(download_callback), result));
return base::DoNothing();
}
urls_ = urls;
expected_hash_ = expected_hash;
current_url_ = urls_.begin();
download_callback_ = std::move(download_callback);
return DoStartDownload(*current_url_);
}
void CrxDownloader::OnDownloadComplete(
bool is_handled,
const Result& result,
const DownloadMetrics& download_metrics) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Release any references held by the progress callback, in case the
// CrxDownloader outlives the receiver of the progress_callback. (This is
// often the case in tests.)
progress_callback_.Reset();
metrics::RecordCRXDownloadComplete(result.error);
if (result.error) {
main_task_runner()->PostTask(
FROM_HERE, base::BindOnce(&CrxDownloader::HandleDownloadError, this,
is_handled, result, download_metrics));
return;
}
CHECK_EQ(0, download_metrics.error);
CHECK(is_handled);
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, kTaskTraits,
base::BindOnce(
// Verifies the hash of a CRX file. Returns NONE or BAD_HASH if
// the hash of the CRX does not match the |expected_hash|. The input
// file is deleted in case of errors.
[](const base::FilePath& filepath, const std::string& expected_hash) {
if (VerifyFileHash256(filepath, expected_hash)) {
return CrxDownloaderError::NONE;
}
DeleteFileAndEmptyParentDirectory(filepath);
return CrxDownloaderError::BAD_HASH;
},
result.response, expected_hash_),
base::BindOnce(
// Handles CRX verification result, and retries the download from
// a different URL if the verification fails.
[](scoped_refptr<CrxDownloader> downloader, Result result,
DownloadMetrics download_metrics, CrxDownloaderError error) {
if (error == CrxDownloaderError::NONE) {
downloader->download_metrics_.push_back(download_metrics);
downloader->main_task_runner()->PostTask(
FROM_HERE,
base::BindOnce(std::move(downloader->download_callback_),
result));
return;
}
result.response.clear();
result.error = static_cast<int>(error);
download_metrics.error = result.error;
downloader->main_task_runner()->PostTask(
FROM_HERE,
base::BindOnce(&CrxDownloader::HandleDownloadError, downloader,
true, result, download_metrics));
},
scoped_refptr<CrxDownloader>(this), result, download_metrics));
}
void CrxDownloader::OnDownloadProgress(int64_t downloaded_bytes,
int64_t total_bytes) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (progress_callback_.is_null()) {
return;
}
progress_callback_.Run(downloaded_bytes, total_bytes);
}
void CrxDownloader::HandleDownloadError(
bool is_handled,
const Result& result,
const DownloadMetrics& download_metrics) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
CHECK_NE(0, result.error);
CHECK(result.response.empty());
CHECK_NE(0, download_metrics.error);
download_metrics_.push_back(download_metrics);
// If an error has occured, try the next url if there is any,
// or try the successor in the chain if there is any successor.
// If this downloader has received a 5xx error for the current url,
// as indicated by the |is_handled| flag, remove that url from the list of
// urls so the url is never tried again down the chain.
if (is_handled) {
current_url_ = urls_.erase(current_url_);
} else {
++current_url_;
}
// Try downloading from another url from the list.
if (current_url_ != urls_.end()) {
DoStartDownload(*current_url_);
return;
}
// Try downloading using the next downloader.
if (successor_ && !urls_.empty()) {
successor_->StartDownload(urls_, expected_hash_,
std::move(download_callback_));
return;
}
// The download ends here since there is no url nor downloader to handle this
// download request further.
main_task_runner()->PostTask(
FROM_HERE, base::BindOnce(std::move(download_callback_), result));
}
} // namespace update_client
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