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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PRELOADING_PREFETCH_PREFETCH_SERVICE_PREFETCH_ORIGIN_DECIDER_H_
#define CHROME_BROWSER_PRELOADING_PREFETCH_PREFETCH_SERVICE_PREFETCH_ORIGIN_DECIDER_H_
#include <map>
#include "base/memory/raw_ptr.h"
#include "base/time/clock.h"
#include "base/time/default_clock.h"
#include "base/time/time.h"
#include "url/gurl.h"
#include "url/origin.h"
class PrefService;
class PrefRegistrySimple;
// A browser-scoped class that maintains persistent logic for when origins
// should not be prefetched.
class PrefetchOriginDecider {
public:
explicit PrefetchOriginDecider(
PrefService* pref_service,
base::Clock* clock = base::DefaultClock::GetInstance());
~PrefetchOriginDecider();
// Registers prefs. Should only be used for storing in a device-local registry
// (non-syncing).
static void RegisterPrefs(PrefRegistrySimple* registry);
// This should be called anytime browsing data is cleared by the user so that
// the persistent data store can be cleared as well.
void OnBrowsingDataCleared();
// Returns true if the given |url|'s origin is eligible to be prefetched, with
// respect to any previous 503 responses with a retry-after header.
bool IsOriginOutsideRetryAfterWindow(const GURL& url) const;
// Records that the given |url| got a 503 response with the given
// |retry_after| value. Note that the passed |retry_after| value is subject to
// a maximum value provided by experiment params.
void ReportOriginRetryAfter(const GURL& url, base::TimeDelta retry_after);
PrefetchOriginDecider(const PrefetchOriginDecider&) = delete;
PrefetchOriginDecider& operator=(const PrefetchOriginDecider&) = delete;
private:
// These methods serialize and deserialize |origin_retry_afters_| to
// |pref_service_| in a dictionary value.
void LoadFromPrefs();
void SaveToPrefs() const;
// Erases any expired entries in |origin_retry_afters_|, returning true iff
// any entries were removed.
bool ClearPastEntries();
// Not owned.
raw_ptr<PrefService, DanglingUntriaged> pref_service_;
raw_ptr<const base::Clock> clock_;
// Maps origins to their last known retry_after time.
std::map<url::Origin, base::Time> origin_retry_afters_;
};
#endif // CHROME_BROWSER_PRELOADING_PREFETCH_PREFETCH_SERVICE_PREFETCH_ORIGIN_DECIDER_H_
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