chrome/browser/chromeos/printing/print_servers_policy_provider.h

// Copyright 2020 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_CHROMEOS_PRINTING_PRINT_SERVERS_POLICY_PROVIDER_H_
#define CHROME_BROWSER_CHROMEOS_PRINTING_PRINT_SERVERS_POLICY_PROVIDER_H_

#include <map>
#include <memory>
#include <string>

#include "base/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/chromeos/printing/print_server.h"
#include "chrome/browser/chromeos/printing/print_servers_provider.h"
#include "components/keyed_service/core/keyed_service.h"

class Profile;

namespace chromeos {

enum ServerPrintersFetchingMode {
  kStandard,
  kSingleServerOnly,
};

// This class observes values provided by the DeviceExternalPrintServers and
// ExternalPrintServers policies and calculates resultant list of available
// print servers. This list is propagated to the provided callback.
class PrintServersPolicyProvider : public KeyedService,
                                   public PrintServersProvider::Observer {
 public:
  PrintServersPolicyProvider(
      base::WeakPtr<PrintServersProvider> user_policy_provider,
      base::WeakPtr<PrintServersProvider> device_policy_provider);

  ~PrintServersPolicyProvider() override;

  using OnPrintServersChanged = typename base::RepeatingCallback<
      void(bool, std::map<GURL, PrintServer>, ServerPrintersFetchingMode)>;

  static std::unique_ptr<PrintServersPolicyProvider> Create(Profile* profile);

  static std::unique_ptr<PrintServersPolicyProvider> CreateForTesting(
      base::WeakPtr<PrintServersProvider> user_policy_provider,
      base::WeakPtr<PrintServersProvider> device_policy_provider);

  // Set the callback when print servers has been updated via policy.
  void SetListener(const OnPrintServersChanged& callback);

  // PrintServersProvider::Observer
  void OnServersChanged(
      bool unused_complete,
      const std::vector<PrintServer>& unused_servers) override;

 private:
  ServerPrintersFetchingMode GetFetchingMode(
      const std::map<GURL, PrintServer>& all_servers);

  base::WeakPtr<PrintServersProvider> user_policy_provider_;
  base::WeakPtr<PrintServersProvider> device_policy_provider_;

  std::map<GURL, PrintServer> all_servers_;

  std::unique_ptr<OnPrintServersChanged> callback_;

  base::WeakPtrFactory<PrintServersPolicyProvider> weak_ptr_factory_{this};
};

}  // namespace chromeos

#endif  // CHROME_BROWSER_CHROMEOS_PRINTING_PRINT_SERVERS_POLICY_PROVIDER_H_