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// Copyright 2019 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 THIRD_PARTY_BLINK_RENDERER_CORE_TIMEZONE_TIMEZONE_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TIMEZONE_TIMEZONE_CONTROLLER_H_
#include <memory>
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/device/public/mojom/time_zone_monitor.mojom-blink.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
// An instance of TimeZoneController manages renderer time zone. It listens to
// the host system time zone change notifications from the browser and when
// received, updates the default ICU time zone and notifies V8 and workers.
//
// Time zone override mode allows clients to temporarily override host system
// time zone with the one specified by the client. The client can change the
// time zone, however no other client will be allowed to set another override
// until the existing override is removed. When the override is removed, the
// current host system time zone is assumed.
class CORE_EXPORT TimeZoneController final
: public device::mojom::blink::TimeZoneMonitorClient {
public:
~TimeZoneController() override;
static void Init();
class TimeZoneOverride {
friend TimeZoneController;
TimeZoneOverride() = default;
public:
void change(const String& timezone_id) {
ChangeTimeZoneOverride(timezone_id);
}
~TimeZoneOverride() { ClearTimeZoneOverride(); }
};
static std::unique_ptr<TimeZoneOverride> SetTimeZoneOverride(
const String& timezone_id);
static bool HasTimeZoneOverride();
static void ChangeTimeZoneForTesting(const String&);
private:
TimeZoneController();
static TimeZoneController& instance();
static void ClearTimeZoneOverride();
static void ChangeTimeZoneOverride(const String&);
// device::mojom::blink::TimeZoneMonitorClient:
void OnTimeZoneChange(const String& timezone_id) override;
// receiver_ must not use HeapMojoReceiver. TimeZoneController is not managed
// by Oilpan.
mojo::Receiver<device::mojom::blink::TimeZoneMonitorClient> receiver_{this};
String host_timezone_id_;
String override_timezone_id_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_TIMEZONE_TIMEZONE_CONTROLLER_H_
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