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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 "base/base64.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/stringprintf.h"
#include "base/thread_task_runner_handle.h"
#include "components/client_update_protocol/ecdsa.h"
#include "components/update_client/configurator.h"
#include "components/update_client/utils.h"
#include "net/http/http_response_headers.h"
#include "net/url_request/url_fetcher.h"
namespace update_client {
namespace {
// This is an ECDSA prime256v1 named-curve key.
const int kKeyVersion = 5;
const char kKeyPubBytesBase64[] =
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEB+Yi+3SdJKCyFJmm+suW3CyXygvVsbDbPnJgoC"
"X4GeTtoL8Q/WjPx7CGtXOL1Xjbx0VPPN3DrvqZSL/oXy9hVw==";
} // namespace
// This value is chosen not to conflict with network errors defined by
// net/base/net_error_list.h. The callers don't have to handle this error in
// any meaningful way, but this value may be reported in UMA stats, therefore
// avoiding collisions with known network errors is desirable.
int RequestSender::kErrorResponseNotTrusted = -10000;
RequestSender::RequestSender(const scoped_refptr<Configurator>& config)
: config_(config), use_signing_(false) {}
RequestSender::~RequestSender() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void RequestSender::Send(bool use_signing,
const std::string& request_body,
const std::vector<GURL>& urls,
const RequestSenderCallback& request_sender_callback) {
DCHECK(thread_checker_.CalledOnValidThread());
use_signing_ = use_signing;
request_body_ = request_body;
urls_ = urls;
request_sender_callback_ = request_sender_callback;
if (urls_.empty()) {
return HandleSendError(-1);
}
cur_url_ = urls_.begin();
if (use_signing_) {
public_key_ = GetKey(kKeyPubBytesBase64);
if (public_key_.empty())
return HandleSendError(-1);
}
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);
}
url_fetcher_ =
SendProtocolRequest(url, request_body_, this, config_->RequestContext());
if (!url_fetcher_.get())
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&RequestSender::SendInternalComplete, base::Unretained(this),
-1, std::string(), std::string()));
}
void RequestSender::SendInternalComplete(int error,
const std::string& response_body,
const std::string& response_etag) {
if (!error) {
if (!use_signing_) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(request_sender_callback_, 0, response_body));
return;
}
DCHECK(use_signing_);
DCHECK(signer_.get());
if (signer_->ValidateResponse(response_body, response_etag)) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(request_sender_callback_, 0, response_body));
return;
}
error = kErrorResponseNotTrusted;
}
DCHECK(error);
if (++cur_url_ != urls_.end() &&
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&RequestSender::SendInternal, base::Unretained(this)))) {
return;
}
HandleSendError(error);
}
void RequestSender::OnURLFetchComplete(const net::URLFetcher* source) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(source);
VLOG(1) << "request completed from url: " << source->GetOriginalURL().spec();
const int fetch_error(GetFetchError(*source));
std::string response_body;
CHECK(source->GetResponseAsString(&response_body));
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&RequestSender::SendInternalComplete, base::Unretained(this),
fetch_error, response_body, GetServerETag(source)));
}
void RequestSender::HandleSendError(int error) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(request_sender_callback_, error, std::string()));
}
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);
}
std::string RequestSender::GetServerETag(const net::URLFetcher* source) {
const auto response_headers(source->GetResponseHeaders());
if (!response_headers)
return std::string();
std::string etag;
return response_headers->EnumerateHeader(nullptr, "ETag", &etag)
? etag
: std::string();
}
} // namespace update_client
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