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// Copyright 2016 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.
#ifndef COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
#define COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string16.h"
#include "components/ntp_tiles/popular_sites.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
namespace base {
class Value;
}
namespace net {
class URLRequestContextGetter;
}
namespace user_prefs {
class PrefRegistrySyncable;
}
namespace variations {
class VariationsService;
}
class PrefService;
class TemplateURLService;
namespace ntp_tiles {
using ParseJSONCallback = base::Callback<void(
const std::string& unsafe_json,
const base::Callback<void(std::unique_ptr<base::Value>)>& success_callback,
const base::Callback<void(const std::string&)>& error_callback)>;
// Actual (non-test) implementation of the PopularSites interface. Caches the
// downloaded file on disk to avoid re-downloading on every startup.
class PopularSitesImpl : public PopularSites, public net::URLFetcherDelegate {
public:
PopularSitesImpl(
const scoped_refptr<base::SequencedWorkerPool>& blocking_pool,
PrefService* prefs,
const TemplateURLService* template_url_service,
variations::VariationsService* variations_service,
net::URLRequestContextGetter* download_context,
const base::FilePath& directory,
ParseJSONCallback parse_json);
~PopularSitesImpl() override;
// PopularSites implementation.
bool MaybeStartFetch(bool force_download,
const FinishedCallback& callback) override;
const SitesVector& sites() const override;
GURL GetLastURLFetched() const override;
GURL GetURLToFetch() override;
std::string GetCountryToFetch() override;
std::string GetVersionToFetch() override;
const base::ListValue* GetCachedJson() override;
// Register preferences used by this class.
static void RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* user_prefs);
private:
// Fetch the popular sites at the given URL, overwriting any cache in prefs
// that already exists.
void FetchPopularSites();
// net::URLFetcherDelegate implementation.
void OnURLFetchComplete(const net::URLFetcher* source) override;
void OnJsonParsed(std::unique_ptr<base::Value> json);
void OnJsonParseFailed(const std::string& error_message);
void OnDownloadFailed();
// Parameters set from constructor.
scoped_refptr<base::TaskRunner> const blocking_runner_;
PrefService* const prefs_;
const TemplateURLService* const template_url_service_;
variations::VariationsService* const variations_;
net::URLRequestContextGetter* const download_context_;
ParseJSONCallback parse_json_;
// Set by MaybeStartFetch() and called after fetch completes.
FinishedCallback callback_;
std::unique_ptr<net::URLFetcher> fetcher_;
bool is_fallback_;
SitesVector sites_;
GURL pending_url_;
base::WeakPtrFactory<PopularSitesImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PopularSitesImpl);
};
} // namespace ntp_tiles
#endif // COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
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