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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/update_client/request_sender.h"
#include <utility>
#include "base/base64.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "components/client_update_protocol/ecdsa.h"
#include "components/update_client/configurator.h"
#include "components/update_client/network.h"
#include "components/update_client/update_client_errors.h"
#include "components/update_client/utils.h"
namespace update_client {
namespace {
// This is an ECDSA prime256v1 named-curve key.
constexpr int kKeyVersion = 10;
constexpr char kKeyPubBytesBase64[] =
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEzOqC8cKNUYIi0UkNu0smZKDW8w5/"
"0EmEw1KQ6Aj/5JWBMdUVm13EIVwFwPlkO/U6vXa+iu4wyUB89GFaldJ7Bg==";
// The content type for all protocol requests.
constexpr char kContentType[] = "application/json";
// Returns the value of |response_cup_server_proof| or the value of
// |response_etag|, if the former value is empty.
const std::string& SelectCupServerProof(
const std::string& response_cup_server_proof,
const std::string& response_etag) {
if (response_cup_server_proof.empty()) {
DVLOG(3) << "Using etag as cup server proof.";
return response_etag;
}
return response_cup_server_proof;
}
} // namespace
RequestSender::RequestSender(scoped_refptr<Configurator> config)
: config_(config) {}
RequestSender::~RequestSender() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void RequestSender::Send(
const std::vector<GURL>& urls,
const base::flat_map<std::string, std::string>& request_extra_headers,
const std::string& request_body,
bool use_signing,
RequestSenderCallback request_sender_callback) {
DCHECK(thread_checker_.CalledOnValidThread());
urls_ = urls;
request_extra_headers_ = request_extra_headers;
request_body_ = request_body;
use_signing_ = use_signing;
request_sender_callback_ = std::move(request_sender_callback);
if (urls_.empty()) {
return HandleSendError(static_cast<int>(ProtocolError::MISSING_URLS), 0);
}
cur_url_ = urls_.begin();
if (use_signing_) {
public_key_ = GetKey(kKeyPubBytesBase64);
if (public_key_.empty())
return HandleSendError(
static_cast<int>(ProtocolError::MISSING_PUBLIC_KEY), 0);
}
SendInternal();
}
void RequestSender::SendInternal() {
DCHECK(cur_url_ != urls_.end());
DCHECK(cur_url_->is_valid());
DCHECK(thread_checker_.CalledOnValidThread());
GURL url(*cur_url_);
if (use_signing_) {
DCHECK(!public_key_.empty());
signer_ = client_update_protocol::Ecdsa::Create(kKeyVersion, public_key_);
std::string request_query_string;
signer_->SignRequest(request_body_, &request_query_string);
url = BuildUpdateUrl(url, request_query_string);
}
VLOG(2) << "Sending Omaha request: " << request_body_;
network_fetcher_ = config_->GetNetworkFetcherFactory()->Create();
if (!network_fetcher_) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::BindOnce(&RequestSender::SendInternalComplete,
base::Unretained(this),
static_cast<int>(ProtocolError::URL_FETCHER_FAILED),
std::string(), std::string(), std::string(), 0));
}
network_fetcher_->PostRequest(
url, request_body_, kContentType, request_extra_headers_,
base::BindOnce(&RequestSender::OnResponseStarted, base::Unretained(this)),
base::DoNothing(),
base::BindOnce(&RequestSender::OnNetworkFetcherComplete,
base::Unretained(this), url));
}
void RequestSender::SendInternalComplete(
int error,
const std::string& response_body,
const std::string& response_etag,
const std::string& response_cup_server_proof,
int retry_after_sec) {
VLOG(2) << "Omaha response received: " << response_body;
if (!error) {
if (!use_signing_) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(std::move(request_sender_callback_), 0,
response_body, retry_after_sec));
return;
}
DCHECK(use_signing_);
DCHECK(signer_);
if (signer_->ValidateResponse(
response_body,
SelectCupServerProof(response_cup_server_proof, response_etag))) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(std::move(request_sender_callback_), 0,
response_body, retry_after_sec));
return;
}
error = static_cast<int>(ProtocolError::RESPONSE_NOT_TRUSTED);
}
DCHECK(error);
// A positive |retry_after_sec| is a hint from the server that the client
// should not send further request until the cooldown has expired.
if (retry_after_sec <= 0 && ++cur_url_ != urls_.end() &&
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(&RequestSender::SendInternal,
base::Unretained(this)))) {
return;
}
VLOG(2) << "Omaha send error: " << response_body;
HandleSendError(error, retry_after_sec);
}
void RequestSender::OnResponseStarted(int response_code,
int64_t content_length) {
response_code_ = response_code;
}
void RequestSender::OnNetworkFetcherComplete(
const GURL& original_url,
std::unique_ptr<std::string> response_body,
int net_error,
const std::string& header_etag,
const std::string& xheader_cup_server_proof,
int64_t xheader_retry_after_sec) {
DCHECK(thread_checker_.CalledOnValidThread());
VLOG(1) << "Request completed from url: " << original_url.spec();
int error = -1;
if (!net_error && response_code_ == 200)
error = 0;
else if (response_code_ != -1)
error = response_code_;
else
error = net_error;
int retry_after_sec = -1;
if (original_url.SchemeIsCryptographic() && error > 0)
retry_after_sec = base::saturated_cast<int>(xheader_retry_after_sec);
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::BindOnce(&RequestSender::SendInternalComplete,
base::Unretained(this), error,
response_body ? *response_body : std::string(),
header_etag, xheader_cup_server_proof, retry_after_sec));
}
void RequestSender::HandleSendError(int error, int retry_after_sec) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(std::move(request_sender_callback_), error,
std::string(), retry_after_sec));
}
std::string RequestSender::GetKey(const char* key_bytes_base64) {
std::string result;
return base::Base64Decode(std::string(key_bytes_base64), &result)
? result
: std::string();
}
GURL RequestSender::BuildUpdateUrl(const GURL& url,
const std::string& query_params) {
const std::string query_string(
url.has_query() ? base::StringPrintf("%s&%s", url.query().c_str(),
query_params.c_str())
: query_params);
GURL::Replacements replacements;
replacements.SetQueryStr(query_string);
return url.ReplaceComponents(replacements);
}
} // namespace update_client
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