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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 "chrome/browser/component_updater/update_checker.h"
#include "base/compiler_specific.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/component_updater/component_updater_utils.h"
#include "chrome/browser/component_updater/crx_update_item.h"
#include "content/public/browser/browser_thread.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
using content::BrowserThread;
namespace component_updater {
// 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 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);
}
return BuildProtocolRequest(app_elements, additional_attributes);
}
class UpdateCheckerImpl
: public UpdateChecker,
public net::URLFetcherDelegate {
public:
UpdateCheckerImpl(const GURL& url,
net::URLRequestContextGetter* url_request_context_getter,
const UpdateCheckCallback& update_check_callback);
virtual ~UpdateCheckerImpl();
// Overrides for UpdateChecker.
virtual bool CheckForUpdates(
const std::vector<CrxUpdateItem*>& items_to_check,
const std::string& additional_attributes) OVERRIDE;
// Overrides for UrlFetcher.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
private:
const GURL url_;
net::URLRequestContextGetter* url_request_context_getter_; // Not owned.
const UpdateCheckCallback update_check_callback_;
scoped_ptr<net::URLFetcher> url_fetcher_;
DISALLOW_COPY_AND_ASSIGN(UpdateCheckerImpl);
};
scoped_ptr<UpdateChecker> UpdateChecker::Create(
const GURL& url,
net::URLRequestContextGetter* url_request_context_getter,
const UpdateCheckCallback& update_check_callback) {
scoped_ptr<UpdateCheckerImpl> update_checker(new UpdateCheckerImpl(
url, url_request_context_getter, update_check_callback));
return update_checker.PassAs<UpdateChecker>();
}
UpdateCheckerImpl::UpdateCheckerImpl(
const GURL& url,
net::URLRequestContextGetter* url_request_context_getter,
const UpdateCheckCallback& update_check_callback)
: url_(url),
url_request_context_getter_(url_request_context_getter),
update_check_callback_(update_check_callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
UpdateCheckerImpl::~UpdateCheckerImpl() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
bool UpdateCheckerImpl::CheckForUpdates(
const std::vector<CrxUpdateItem*>& items_to_check,
const std::string& additional_attributes) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (url_fetcher_)
return false; // Another fetch is in progress.
url_fetcher_.reset(SendProtocolRequest(
url_,
BuildUpdateCheckRequest(items_to_check, additional_attributes),
this,
url_request_context_getter_));
return true;
}
void UpdateCheckerImpl::OnURLFetchComplete(const net::URLFetcher* source) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(url_fetcher_.get() == source);
int error = 0;
std::string error_message;
UpdateResponse update_response;
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");
}
url_fetcher_.reset();
update_check_callback_.Run(error, error_message, update_response.results());
}
} // namespace component_updater
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