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// Copyright 2018 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 CHROME_BROWSER_PREVIEWS_PREVIEWS_LITE_PAGE_DECIDER_H_
#define CHROME_BROWSER_PREVIEWS_PREVIEWS_LITE_PAGE_DECIDER_H_
#include <memory>
#include <unordered_map>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/optional.h"
#include "base/sequence_checker.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "chrome/browser/previews/previews_lite_page_navigation_throttle_manager.h"
#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
#include "net/http/http_request_headers.h"
class PrefService;
namespace content {
class BrowserContext;
class NavigationHandle;
class NavigationThrottle;
} // namespace content
namespace user_prefs {
class PrefRegistrySyncable;
}
// This class ensures that the feature is enabled and the
// current Profile is not incognito before handing off the real legwork of the
// triggering decision to |PreviewsLitePageNavigationThrottle|.
class PreviewsLitePageDecider
: public PreviewsLitePageNavigationThrottleManager,
public data_reduction_proxy::DataReductionProxySettingsObserver {
public:
explicit PreviewsLitePageDecider(content::BrowserContext* browser_context);
virtual ~PreviewsLitePageDecider();
// Registers the prefs used in this class.
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
// Checks if the feature is enabled and if so, returns a
// |PreviewsLitePageNavigationThrottle| that handles the rest of the decision
// making.
static std::unique_ptr<content::NavigationThrottle> MaybeCreateThrottleFor(
content::NavigationHandle* handle);
// Removes |this| as a DataReductionProxySettingsObserver.
void Shutdown();
// Sets the internal clock for testing.
void SetClockForTesting(const base::TickClock* clock);
// Sets |drp_settings_| for testing and registers |this| as an observer.
void SetDRPSettingsForTesting(
data_reduction_proxy::DataReductionProxySettings* drp_settings);
// Clears all single bypasses for testing.
void ClearSingleBypassForTesting();
// Sets that the user has seen the UI notification.
void SetUserHasSeenUINotification();
private:
FRIEND_TEST_ALL_PREFIXES(PreviewsLitePageDeciderTest, TestServerUnavailable);
FRIEND_TEST_ALL_PREFIXES(PreviewsLitePageDeciderTest, TestSingleBypass);
// PreviewsLitePageNavigationThrottleManager:
void SetServerUnavailableFor(base::TimeDelta retry_after) override;
bool IsServerUnavailable() override;
void AddSingleBypass(std::string url) override;
bool CheckSingleBypass(std::string url) override;
uint64_t GeneratePageID() override;
void ReportDataSavings(int64_t network_bytes,
int64_t original_bytes,
const std::string& host) override;
bool NeedsToNotifyUser() override;
void NotifyUser(content::WebContents* web_contents) override;
// data_reduction_proxy::DataReductionProxySettingsObserver:
void OnProxyRequestHeadersChanged(
const net::HttpRequestHeaders& headers) override;
void OnSettingsInitialized() override;
// The time after which it is ok to send the server more preview requests.
base::Optional<base::TimeTicks> retry_at_;
// A map that tracks the time at which a URL will stop being bypassed.
std::unordered_map<std::string, base::TimeTicks> single_bypass_;
// The clock used for getting the current time ticks. Use |SetClockForTesting|
// in tests.
const base::TickClock* clock_;
// The page id to send on requests to the previews server. This is reset to a
// random value on instantiation and every time the server headers change.
uint64_t page_id_;
// A reference to the DRP Settings so that |this| can be removed as an
// observer on |Shutdown|. Not owned.
data_reduction_proxy::DataReductionProxySettings* drp_settings_;
// A reference to the profile's |PrefService|.
PrefService* pref_service_;
// Whether the notification infobar needs to be shown to the user in order to
// use this preview.
bool need_to_show_notification_;
SEQUENCE_CHECKER(sequence_checker_);
DISALLOW_COPY_AND_ASSIGN(PreviewsLitePageDecider);
};
#endif // CHROME_BROWSER_PREVIEWS_PREVIEWS_LITE_PAGE_DECIDER_H_