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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 CHROME_BROWSER_UI_WEBUI_MANAGED_UI_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_MANAGED_UI_HANDLER_H_
#include <memory>
#include <string>
#include "base/macros.h"
#include "components/policy/core/common/policy_service.h"
#include "components/prefs/pref_change_registrar.h"
#include "content/public/browser/web_ui_message_handler.h"
namespace content {
class WebUI;
class WebUIDataSource;
} // namespace content
class Profile;
class ManagedUIHandler : public content::WebUIMessageHandler,
public policy::PolicyService::Observer {
public:
explicit ManagedUIHandler(Profile* profile);
~ManagedUIHandler() override;
// Sets load-time constants on |source|. This handles a flicker-free initial
// page load (i.e. loadTimeData.getBoolean('isManaged')). Adds a
// ManagedUIHandler to |web_ui|. Continually updates |source| by name if
// managed state changes. This is so page refreshes will have fresh, correct
// data. Neither |web_ui| nor |source| may be nullptr.
static void Initialize(content::WebUI* web_ui,
content::WebUIDataSource* source);
protected:
// Protected for tests.
static void InitializeInternal(content::WebUI* web_ui,
content::WebUIDataSource* source,
Profile* profile);
private:
// policy::PolicyService::Observer
void OnPolicyUpdated(const policy::PolicyNamespace& ns,
const policy::PolicyMap& previous,
const policy::PolicyMap& current) override;
// content::WebUIMessageHandler:
void RegisterMessages() override;
void OnJavascriptDisallowed() override;
// Handles the "observeManagedUI" message. No arguments.
void HandleObserveManagedUI(const base::ListValue* args);
// Add/remove observers on the PolicyService.
void AddObservers();
void RemoveObservers();
// Generates a dictionary with "isManaged" and "managedByOrg" i18n keys based
// on |managed_|. Called initialize and on each change for notifications.
std::unique_ptr<base::DictionaryValue> GetDataSourceUpdate() const;
// Fire a webui listener notification if dark mode actually changed.
void NotifyIfChanged();
// To avoid double-removing the observers, which would cause a DCHECK()
// failure.
bool has_observers_ = false;
PrefChangeRegistrar pref_registrar_;
// Profile to update data sources on. Injected for testing.
Profile* const profile_;
// Whether or not this page is currently showing the managed UI footnote.
bool managed_;
// Name of the WebUIDataSource to update.
std::string source_name_;
DISALLOW_COPY_AND_ASSIGN(ManagedUIHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_MANAGED_UI_HANDLER_H_
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