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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 "extensions/browser/content_hash_fetcher.h"
#include <stddef.h>
#include <algorithm>
#include <memory>
#include <vector>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/json/json_reader.h"
#include "base/task/sequenced_task_runner.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/content_verifier/content_hash.h"
#include "extensions/browser/content_verifier/content_verifier_delegate.h"
#include "extensions/browser/extension_file_task_runner.h"
#include "extensions/browser/verified_contents.h"
#include "extensions/common/extension.h"
#include "extensions/common/file_util.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
namespace extensions {
namespace internals {
ContentHashFetcher::ContentHashFetcher(ContentHash::FetchKey key)
: fetch_key_(std::move(key)),
response_task_runner_(base::SequencedTaskRunner::GetCurrentDefault()) {}
void ContentHashFetcher::OnSimpleLoaderComplete(
std::unique_ptr<std::string> response_body) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
VLOG(1) << "URLFetchComplete for " << fetch_key_.extension_id
<< " is_success:" << !!response_body << " "
<< fetch_key_.fetch_url.possibly_invalid_spec();
DCHECK(hash_fetcher_callback_);
DCHECK(simple_loader_);
bool report_http_response_code =
(simple_loader_->NetError() == net::OK ||
simple_loader_->NetError() == net::ERR_HTTP_RESPONSE_CODE_FAILURE) &&
simple_loader_->ResponseInfo() && simple_loader_->ResponseInfo()->headers;
response_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
std::move(hash_fetcher_callback_), std::move(fetch_key_),
std::move(response_body),
report_http_response_code
? simple_loader_->ResponseInfo()->headers->response_code()
: simple_loader_->NetError()));
delete this;
}
void ContentHashFetcher::Start(HashFetcherCallback hash_fetcher_callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
hash_fetcher_callback_ = std::move(hash_fetcher_callback);
net::NetworkTrafficAnnotationTag traffic_annotation =
net::DefineNetworkTrafficAnnotation("content_hash_verification_job", R"(
semantics {
sender: "Web Store Content Verification"
description:
"The request sent to retrieve the file required for content "
"verification for an extension from the Web Store."
trigger:
"An extension from the Web Store is missing the "
"verified_contents.json file required for extension content "
"verification."
data: "The extension id and extension version."
destination: GOOGLE_OWNED_SERVICE
}
policy {
cookies_allowed: NO
setting:
"This feature cannot be directly disabled; it is enabled if any "
"extension from the webstore is installed in the browser."
policy_exception_justification:
"Not implemented, not required. If the user has extensions from "
"the Web Store, this feature is required to ensure the "
"extensions match what is distributed by the store."
})");
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = fetch_key_.fetch_url;
resource_request->load_flags = net::LOAD_DISABLE_CACHE;
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
mojo::Remote<network::mojom::URLLoaderFactory> url_loader_factory_remote(
std::move(fetch_key_.url_loader_factory_remote));
simple_loader_ = network::SimpleURLLoader::Create(std::move(resource_request),
traffic_annotation);
const int kMaxRetries = 3;
simple_loader_->SetRetryOptions(
kMaxRetries,
network::SimpleURLLoader::RetryMode::RETRY_ON_NETWORK_CHANGE);
simple_loader_->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory_remote.get(),
base::BindOnce(&ContentHashFetcher::OnSimpleLoaderComplete,
base::Unretained(this)));
}
ContentHashFetcher::~ContentHashFetcher() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
} // namespace internals
} // namespace extensions
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