// Copyright 2016 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.

#include "chromeos/dbus/fake_cryptohome_client.h"

#include <string>

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/run_loop.h"
#include "base/scoped_observer.h"
#include "base/test/scoped_task_environment.h"
#include "chromeos/dbus/attestation/attestation.pb.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace chromeos {

namespace {

// Keeps arguments for the last AsyncCallStatusWithData().
class TestObserver : public CryptohomeClient::Observer {
 public:
  TestObserver() = default;

  bool return_status() const { return return_status_; }
  const std::string& data() const { return data_; }

  void AsyncCallStatusWithData(int async_id,
                               bool return_status,
                               const std::string& data) override {
    return_status_ = return_status;
    data_ = data;
  }

 private:
  bool return_status_ = false;
  std::string data_;
  DISALLOW_COPY_AND_ASSIGN(TestObserver);
};

}  // namespace

class FakeCryptohomeClientTest : public ::testing::Test {
 public:
  FakeCryptohomeClientTest() = default;

 protected:
  base::test::ScopedTaskEnvironment scoped_task_environment_;
  FakeCryptohomeClient fake_cryptohome_client_;

 private:
  DISALLOW_COPY_AND_ASSIGN(FakeCryptohomeClientTest);
};

TEST_F(FakeCryptohomeClientTest, SignSimpleChallenge) {
  constexpr char kChallenge[] = "challenge";

  TestObserver observer;
  ScopedObserver<CryptohomeClient, TestObserver> scoped_observer(&observer);
  scoped_observer.Add(&fake_cryptohome_client_);

  cryptohome::AccountIdentifier cryptohome_id;
  bool called = false;
  fake_cryptohome_client_.TpmAttestationSignSimpleChallenge(
      attestation::AttestationKeyType::KEY_DEVICE, cryptohome_id, "key_name",
      kChallenge,
      base::BindOnce(
          [](bool* called, base::Optional<int> async_id) { *called = true; },
          &called));
  base::RunLoop().RunUntilIdle();
  EXPECT_TRUE(called);
  EXPECT_TRUE(observer.return_status());

  chromeos::attestation::SignedData signed_data;
  ASSERT_TRUE(signed_data.ParseFromString(observer.data()));
  ASSERT_EQ(static_cast<size_t>(20),
            signed_data.data().size() - sizeof(kChallenge) + 1 /* for '\0' */);
  EXPECT_EQ(kChallenge,
            signed_data.data().substr(0, signed_data.data().size() - 20));
}

}  // namespace chromeos