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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/web_applications/isolated_web_apps/isolated_web_app_downloader.h"
#include <memory>
#include <optional>
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/thread_pool.h"
#include "net/base/net_errors.h"
#include "net/http/http_request_headers.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "url/gurl.h"
namespace web_app {
void ScopedTempWebBundleFile::Create(
base::OnceCallback<void(ScopedTempWebBundleFile)> callback) {
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()},
base::BindOnce([]() -> ScopedTempWebBundleFile {
auto file = std::make_unique<base::ScopedTempFile>();
if (!file->Create()) {
return ScopedTempWebBundleFile(/*file=*/nullptr);
}
return ScopedTempWebBundleFile(std::move(file));
}),
std::move(callback));
}
ScopedTempWebBundleFile::ScopedTempWebBundleFile(
std::unique_ptr<base::ScopedTempFile> file)
: file_(std::move(file)) {}
ScopedTempWebBundleFile::~ScopedTempWebBundleFile() {
if (!file_) {
return;
}
// Deleting the file must happen on a thread that allows blocking.
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
base::BindOnce(
[](std::unique_ptr<base::ScopedTempFile> file) {
// `file` is deleted here.
},
std::move(file_)));
}
ScopedTempWebBundleFile& ScopedTempWebBundleFile::operator=(
ScopedTempWebBundleFile&&) = default;
ScopedTempWebBundleFile::ScopedTempWebBundleFile(ScopedTempWebBundleFile&&) =
default;
const base::FilePath& ScopedTempWebBundleFile::path() const {
CHECK(file_) << "`path()` must not be called on a nullptr `file_`.";
return file_->path();
}
// static
std::unique_ptr<IsolatedWebAppDownloader> IsolatedWebAppDownloader::Create(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory) {
return base::WrapUnique(
new IsolatedWebAppDownloader(std::move(url_loader_factory)));
}
// static
std::unique_ptr<IsolatedWebAppDownloader>
IsolatedWebAppDownloader::CreateAndStartDownloading(
GURL url,
base::FilePath destination,
net::PartialNetworkTrafficAnnotationTag partial_traffic_annotation,
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
IsolatedWebAppDownloader::DownloadCallback download_callback) {
auto downloader = Create(std::move(url_loader_factory));
downloader->DownloadSignedWebBundle(std::move(url), std::move(destination),
std::move(partial_traffic_annotation),
std::move(download_callback));
return downloader;
}
IsolatedWebAppDownloader::IsolatedWebAppDownloader(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: url_loader_factory_(std::move(url_loader_factory)) {}
IsolatedWebAppDownloader::~IsolatedWebAppDownloader() = default;
namespace {
net::NetworkTrafficAnnotationTag GetNetworkTrafficAnnotationTag(
net::PartialNetworkTrafficAnnotationTag partial_traffic_annotation) {
return net::CompleteNetworkTrafficAnnotation("iwa_bundle_downloader",
partial_traffic_annotation,
R"(
semantics {
data:
"This request does not send any user data. Its destination is the URL "
"of a Signed Web Bundle of an Isolated Web App that is installed for "
"the user."
destination: OTHER
internal {
contacts {
owners: "//chrome/browser/web_applications/isolated_web_apps/OWNERS"
}
}
user_data {
type: NONE
}
last_reviewed: "2023-06-01"
}
policy {
cookies_allowed: NO
})");
}
} // namespace
void IsolatedWebAppDownloader::DownloadSignedWebBundle(
GURL url,
base::FilePath destination,
net::PartialNetworkTrafficAnnotationTag partial_traffic_annotation,
DownloadCallback download_callback) {
net::NetworkTrafficAnnotationTag traffic_annotation =
GetNetworkTrafficAnnotationTag(std::move(partial_traffic_annotation));
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = url;
// Cookies are not allowed.
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), std::move(traffic_annotation));
simple_url_loader_->SetRetryOptions(
/* max_retries=*/3,
network::SimpleURLLoader::RETRY_ON_5XX |
network::SimpleURLLoader::RETRY_ON_NETWORK_CHANGE);
simple_url_loader_->DownloadToFile(
url_loader_factory_.get(),
base::BindOnce(&IsolatedWebAppDownloader::OnSignedWebBundleDownloaded,
// The callback will never run if `this` is deleted,
// because `simple_url_loader_` is a member of `this`.
base::Unretained(this), destination)
.Then(std::move(download_callback)),
destination);
}
void IsolatedWebAppDownloader::DownloadInitialBytes(
GURL url,
net::PartialNetworkTrafficAnnotationTag partial_traffic_annotation,
PartialDownloadCallback download_callback) {
net::NetworkTrafficAnnotationTag traffic_annotation =
GetNetworkTrafficAnnotationTag(std::move(partial_traffic_annotation));
// 8 KiB - this should be enough to contain the entire integrity block of any
// signed web bundle. While it is technically possible to create a bigger one,
// there's no reason to do that. In such case, if it happens, this whole
// heuristic is skipped and the entire bundle is downloaded.
constexpr size_t kMaxInitialBytes = 8 * 1024;
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = std::move(url);
// Cookies are not allowed.
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
resource_request->headers.SetHeader(
net::HttpRequestHeaders::kRange,
net::HttpByteRange::Bounded(0, kMaxInitialBytes - 1).GetHeaderValue());
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), std::move(traffic_annotation));
simple_url_loader_->SetRetryOptions(
/* max_retries=*/3,
network::SimpleURLLoader::RETRY_ON_5XX |
network::SimpleURLLoader::RETRY_ON_NETWORK_CHANGE);
simple_url_loader_->SetAllowPartialResults(true);
simple_url_loader_->DownloadToString(url_loader_factory_.get(),
std::move(download_callback),
kMaxInitialBytes);
}
int32_t IsolatedWebAppDownloader::OnSignedWebBundleDownloaded(
base::FilePath destination,
base::FilePath actual_destination) {
if (actual_destination.empty()) {
int32_t net_error = simple_url_loader_->NetError();
CHECK_NE(net_error, net::OK);
return net_error;
}
CHECK_EQ(actual_destination, destination);
return net::OK;
}
} // namespace web_app
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