// Copyright 2015 The Chromium OS 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 TPM_MANAGER_CLIENT_TPM_OWNERSHIP_DBUS_PROXY_H_
#define TPM_MANAGER_CLIENT_TPM_OWNERSHIP_DBUS_PROXY_H_

#include "tpm_manager/common/tpm_ownership_interface.h"

#include <string>
#include <vector>

#include <base/macros.h>
#include <base/memory/ref_counted.h>
#include <dbus/bus.h>
#include <dbus/object_proxy.h>

#include "tpm_manager/client/tpm_ownership_signal_handler.h"
#include "tpm_manager/common/export.h"

namespace tpm_manager {

// An implementation of TpmOwnershipInterface that forwards requests to
// tpm_managerd over D-Bus.
// Usage:
// std::unique_ptr<TpmOwnershipInterface> tpm_ = new TpmOwnershipDBusProxy();
// tpm_->GetTpmStatus(...);
class TPM_MANAGER_EXPORT TpmOwnershipDBusProxy : public TpmOwnershipInterface {
 public:
  TpmOwnershipDBusProxy() = default;
  ~TpmOwnershipDBusProxy() override;

  // Performs initialization tasks. This method must be called before calling
  // any other method in this class. Returns true on success.
  bool Initialize();

  // Connects ownership taken signal. |handler| is used to handle the dbus
  // signal. Returns |false| iff |handler| is null or this function is called
  // before already. Note that the signal connection failure doesn't make this
  // functions return |false| becuase the failure is handled by callback.
  bool ConnectToSignal(TpmOwnershipTakenSignalHandler* handler);

  // TpmOwnershipInterface methods.
  void GetTpmStatus(const GetTpmStatusRequest& request,
                    const GetTpmStatusCallback& callback) override;
  void GetVersionInfo(const GetVersionInfoRequest& request,
                      const GetVersionInfoCallback& callback) override;
  void GetDictionaryAttackInfo(
      const GetDictionaryAttackInfoRequest& request,
      const GetDictionaryAttackInfoCallback& callback) override;
  void ResetDictionaryAttackLock(
      const ResetDictionaryAttackLockRequest& request,
      const ResetDictionaryAttackLockCallback& callback) override;
  void TakeOwnership(const TakeOwnershipRequest& request,
                     const TakeOwnershipCallback& callback) override;
  void RemoveOwnerDependency(
      const RemoveOwnerDependencyRequest& request,
      const RemoveOwnerDependencyCallback& callback) override;
  void ClearStoredOwnerPassword(
      const ClearStoredOwnerPasswordRequest& request,
      const ClearStoredOwnerPasswordCallback& callback) override;

  void set_object_proxy(dbus::ObjectProxy* object_proxy) {
    object_proxy_ = object_proxy;
  }

 private:
  // Template method to call a given |method_name| remotely via dbus.
  template <typename ReplyProtobufType,
            typename RequestProtobufType,
            typename CallbackType>
  void CallMethod(const std::string& method_name,
                  const RequestProtobufType& request,
                  const CallbackType& callback);

  scoped_refptr<dbus::Bus> bus_;
  dbus::ObjectProxy* object_proxy_;

  TpmOwnershipTakenSignalHandler* ownership_taken_signal_handler_{nullptr};

  DISALLOW_COPY_AND_ASSIGN(TpmOwnershipDBusProxy);
};

}  // namespace tpm_manager

#endif  // TPM_MANAGER_CLIENT_TPM_OWNERSHIP_DBUS_PROXY_H_