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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/update_checker.h"
#include <stddef.h>
#include <string>
#include <vector>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/stringprintf.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/thread_checker.h"
#include "components/update_client/configurator.h"
#include "components/update_client/crx_update_item.h"
#include "components/update_client/request_sender.h"
#include "components/update_client/utils.h"
#include "net/url_request/url_fetcher.h"
#include "url/gurl.h"
namespace update_client {
namespace {
// Builds an update check request for |components|. |additional_attributes| is
// serialized as part of the <request> element of the request to customize it
// with data that is not platform or component specific. For each |item|, a
// corresponding <app> element is created and inserted as a child node of
// the <request>.
//
// An app element looks like this:
// <app appid="hnimpnehoodheedghdeeijklkeaacbdc"
// version="0.1.2.3" installsource="ondemand">
// <updatecheck />
// <packages>
// <package fp="abcd" />
// </packages>
// </app>
std::string BuildUpdateCheckRequest(const Configurator& config,
const std::vector<CrxUpdateItem*>& items,
const std::string& additional_attributes) {
std::string app_elements;
for (size_t i = 0; i != items.size(); ++i) {
const CrxUpdateItem* item = items[i];
std::string app("<app ");
base::StringAppendF(&app, "appid=\"%s\" version=\"%s\"", item->id.c_str(),
item->component.version.GetString().c_str());
if (item->on_demand)
base::StringAppendF(&app, " installsource=\"ondemand\"");
base::StringAppendF(&app, ">");
base::StringAppendF(&app, "<updatecheck />");
if (!item->component.fingerprint.empty()) {
base::StringAppendF(&app,
"<packages>"
"<package fp=\"%s\"/>"
"</packages>",
item->component.fingerprint.c_str());
}
base::StringAppendF(&app, "</app>");
app_elements.append(app);
VLOG(1) << "Appending to update request: " << app;
}
return BuildProtocolRequest(
config.GetBrowserVersion().GetString(), config.GetChannel(),
config.GetLang(), config.GetOSLongName(), config.GetDownloadPreference(),
app_elements, additional_attributes);
}
class UpdateCheckerImpl : public UpdateChecker {
public:
explicit UpdateCheckerImpl(const scoped_refptr<Configurator>& config);
~UpdateCheckerImpl() override;
// Overrides for UpdateChecker.
bool CheckForUpdates(
const std::vector<CrxUpdateItem*>& items_to_check,
const std::string& additional_attributes,
const UpdateCheckCallback& update_check_callback) override;
private:
void OnRequestSenderComplete(const net::URLFetcher* source);
const scoped_refptr<Configurator> config_;
UpdateCheckCallback update_check_callback_;
scoped_ptr<RequestSender> request_sender_;
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(UpdateCheckerImpl);
};
UpdateCheckerImpl::UpdateCheckerImpl(const scoped_refptr<Configurator>& config)
: config_(config) {}
UpdateCheckerImpl::~UpdateCheckerImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
}
bool UpdateCheckerImpl::CheckForUpdates(
const std::vector<CrxUpdateItem*>& items_to_check,
const std::string& additional_attributes,
const UpdateCheckCallback& update_check_callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (request_sender_.get()) {
NOTREACHED();
return false; // Another update check is in progress.
}
update_check_callback_ = update_check_callback;
request_sender_.reset(new RequestSender(config_));
request_sender_->Send(
BuildUpdateCheckRequest(*config_, items_to_check, additional_attributes),
config_->UpdateUrl(),
base::Bind(&UpdateCheckerImpl::OnRequestSenderComplete,
base::Unretained(this)));
return true;
}
void UpdateCheckerImpl::OnRequestSenderComplete(const net::URLFetcher* source) {
DCHECK(thread_checker_.CalledOnValidThread());
GURL original_url;
int error = 0;
std::string error_message;
UpdateResponse update_response;
if (source) {
original_url = source->GetOriginalURL();
VLOG(1) << "Update check request went to: " << original_url.spec();
if (FetchSuccess(*source)) {
std::string xml;
source->GetResponseAsString(&xml);
if (!update_response.Parse(xml)) {
error = -1;
error_message = update_response.errors();
}
} else {
error = GetFetchError(*source);
error_message.assign("network error");
}
} else {
error = -1;
error_message = "no fetcher";
}
if (error) {
VLOG(1) << "Update request failed: " << error_message;
}
request_sender_.reset();
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(update_check_callback_, original_url, error,
error_message, update_response.results()));
}
} // namespace
scoped_ptr<UpdateChecker> UpdateChecker::Create(
const scoped_refptr<Configurator>& config) {
return scoped_ptr<UpdateChecker>(new UpdateCheckerImpl(config));
}
} // namespace update_client
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