//
// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "attestation/client/dbus_proxy.h"

#include <brillo/bind_lambda.h>
#include <brillo/dbus/dbus_method_invoker.h>

#include "attestation/common/dbus_interface.h"

namespace {

// Use a two minute timeout because TPM operations can take a long time and
// there may be a few of them queued up.
const int kDBusTimeoutMS = 120000;

}  // namespace

namespace attestation {

DBusProxy::DBusProxy() {}
DBusProxy::~DBusProxy() {
  if (bus_) {
    bus_->ShutdownAndBlock();
  }
}

bool DBusProxy::Initialize() {
  dbus::Bus::Options options;
  options.bus_type = dbus::Bus::SYSTEM;
  bus_ = new dbus::Bus(options);
  object_proxy_ = bus_->GetObjectProxy(
      attestation::kAttestationServiceName,
      dbus::ObjectPath(attestation::kAttestationServicePath));
  return (object_proxy_ != nullptr);
}

void DBusProxy::CreateGoogleAttestedKey(
    const CreateGoogleAttestedKeyRequest& request,
    const CreateGoogleAttestedKeyCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    CreateGoogleAttestedKeyReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kCreateGoogleAttestedKey,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::GetKeyInfo(const GetKeyInfoRequest& request,
                           const GetKeyInfoCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    GetKeyInfoReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kGetKeyInfo,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::GetEndorsementInfo(const GetEndorsementInfoRequest& request,
                                   const GetEndorsementInfoCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    GetEndorsementInfoReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kGetEndorsementInfo,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::GetAttestationKeyInfo(
    const GetAttestationKeyInfoRequest& request,
    const GetAttestationKeyInfoCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    GetAttestationKeyInfoReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kGetAttestationKeyInfo,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::ActivateAttestationKey(
    const ActivateAttestationKeyRequest& request,
    const ActivateAttestationKeyCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    ActivateAttestationKeyReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kActivateAttestationKey,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::CreateCertifiableKey(
    const CreateCertifiableKeyRequest& request,
    const CreateCertifiableKeyCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    CreateCertifiableKeyReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kCreateCertifiableKey,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::Decrypt(const DecryptRequest& request,
                        const DecryptCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    DecryptReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kDecrypt,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::Sign(const SignRequest& request, const SignCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    SignReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kSign,
      callback,
      base::Bind(on_error),
      request);
}

void DBusProxy::RegisterKeyWithChapsToken(
    const RegisterKeyWithChapsTokenRequest& request,
    const RegisterKeyWithChapsTokenCallback& callback) {
  auto on_error = [callback](brillo::Error* error) {
    RegisterKeyWithChapsTokenReply reply;
    reply.set_status(STATUS_NOT_AVAILABLE);
    callback.Run(reply);
  };
  brillo::dbus_utils::CallMethodWithTimeout(
      kDBusTimeoutMS,
      object_proxy_,
      attestation::kAttestationInterface,
      attestation::kRegisterKeyWithChapsToken,
      callback,
      base::Bind(on_error),
      request);
}

}  // namespace attestation